MXPA96005931A - An induction diagrafía probe including a bended arrangement apparatus that has a plurality of receiving coils and compensating coils re-enroll - Google Patents

Abstract

The present invention relates to a new induction logging tool having a length of the tool string that is shorter than the tool string length of the induction logging tool of the prior art. The new induction logging tool includes a new induction array that appears to be folded around an axis that matches the transmitter of the induction array of the prior art induction logging tool. The new bent induction array includes a transmitter coil positioned at one end of the bent induction array, and a plurality of "re-wound" receiver coils and compensating coils a further plurality of individual receiver coils and at least one additional offset coil positioned adjacent to and on one side of the transmitter coil of the new bent induction array. In the new bent induction array, one of the plurality of rewind receiving coils and compensating coils includes a receiver coil (N-1) and a compensating coil (N), associated with another receiver coil (N), which is - winding together around the same coil, the receiver coil (N-1) and the compensating coil (N) are placed approximately the same distance from the transmitter coil. Each of the plurality of rewinding receiving coils and compensating coils is formed by winding both the compensating coil (N) and the receiving coil (N-1) in a bifilar manner in the same ceramic coil starting from the center of the coil , and winding the receiver coil (N-1) and the compensating coil (N) in opposite directions

Description

"AN INDUCTION DIAGRAFÍA PROBE INCLUDING AN APPARATUS OF FOLDED ARRANGEMENT THAT HAS A PLURALITY OF COILS RECEIVERS AND RE-COOLED COMPENSATING COILS " BACKGROUND OF THE INVENTION The subject matter of the present invention relates to an inductive diagnostic probe adapted to be placed in a sounding including a "bent" detector arrangement, the detector arrangement includes a transmitter coil and a plurality of compensating coils and receiver coils, the plurality of compensating coils and receiver coils further include a plurality of rewinding compensating coils and receiving coils, each of the plurality of rewinding coils and rewinding receiving coils being rewound together in the same coil, the transmitter coil being placed in a coil. At the end of the array, the plurality of compensating coils and receiver coils include the plurality of compensating coils and re-enriched receiver coils that are placed on only one side of the transmitter coil, thereby shortening the detector array of the present invention relative to the Detection arrangement of other induction tools of the prior art.

Over the past two decades, the electronics industry has been packing more and more circuits into smaller and smaller packages. However, in the last decade and a half, since the digital wellbore tools were introduced, the trend has been to pack more circuits in the tools ofdiagrafia. Examples of these circuits packed in the diagnostic tools include automatic self-verification calibration, more measurement channels, more detectors, etc. As a result, a combination of conventional well-logging tools today is longer, in length, than its tool string duplicated fifteen years ago. The measurements, made by the string of conventional well logging tools, are more accurate and abundant, and the environmental corrections are more automatic, but the increased length of the tool string of the conventional well logging tool means that it must be drilled a larger reduced bore hole, and assembly time (the time it takes to assemble the tool string) requires a longer period. An example of a conventional well-hole induction tool disclosed in U.S. Patent No. 5,157,605 to Chandler et al., Entitled "Induction Logging Method and Apparatus Including Means for Combining In-Phaser and Quadrature Components of Signals Received at Varying Frequencies and Including use of Multiple Receiver Means Associated With a Single Transmitter ", the exposure of which is incoded by reference in this specification. In the Chardler patent, the induction tool includes an induction array, and the induction array includes a transmitter coil, a receiver coil positioned on both sides of the transmitter coil, and a secondary or compensating coil positioned on both sides of the inductor. the transmitter coil interposed between the transmitter coil and each receiver coil. Although the measurements made by the induction logging tool of the Chandler Patent are accurate and abundant, the length of the induction logging tool string that included the induction array of the Chandler Patent is approximately 12,192 meters. As a result, it can be difficult to place the induction logging tool string of Chadler's Patent in boreholes that have a minimum bore hole, or in boreholes that have serious dog legs, or in horizontal boreholes that have a starting radius short. As a result, there is a need for a new induction diaphragm tool in accordance with the present invention, which has a length of the tool string (of 4,877 meters) that is shorter than the length of the tool string (12,192 meters) of the induction logging tool of the prior art Chardler Patent. As a result, the new induction diaphragm tool of the present invention has less chance of getting stuck in boreholes having insufficient borehole conditions, and will provide diameters in a minimum bore hole, can be placed into boreholes having serious dog legs, and can be placed into horizontal boreholes that have a short starting radius.

COMPENDIUM OF THE INVENTION Accordingly, a main object of the present invention is to provide a new induction-based gravure tool having a tool string length that is shorter than the length of the tool string of the technique's induction-based gravure tool. previous. A further object of the present invention is to provide a new induction-based gravure tool having a tool string length that is shorter than the tool string length of the prior art induction-gravure tool, the new tool induction diaphragm includes a new induction array that appears to be bent about an axis relative to the induction array of the prior art induction logging tool, and as a result of apparent bending around the axis, the new Induction logging tool is shorter in length than the induction logging tools of the prior art. A further object of the present invention is to provide a new digraph tool by induction having a length of the tool string that is shorter than the tool string length of the induction log tool of the prior art, the The new induction logging tool includes a new induction array that appears to be bent about an axis relative to the induction array of the prior art induction logging tool, the new bent array includes a transmitter coil and a plurality of receiver coils and compensating coils that further include a plurality of rewind receiving coils and compensating coils, the transmitter coil that is positioned at one end of the new bent induction array, and the plurality of receiver coils and compensating coils include the plurality of coils receivers and rewinding coils rewired adjacent to and only on one side of the transmitter coil of the new bent induction array, the length of the new bent induction array is about half the length of the induction array of the prior art induction tool, in view of the rewinding of the receiver coils and compensating coils. A further object of the present invention is to provide a new induction logging tool having an exact tool length that is shorter than the exact tool length of the induction logging tool of the prior art, the new tool for logging by induction includes a new induction array that appears to be bent about an axis relative to the induction array of the induction logging tool of the prior art, the new bent induction array includes a transmitter coil and a plurality of receiver coils and re-wound compensating coils, the transmitter coil is positioned at one end of the new bent induction array and the plurality of rewind receiving coils and compensating coils is positioned adjacent to and on the transmitter coil side of the new bent induction array, The length of the new double induction arrangement This is about half the length of the induction array of the induction tool of the prior art, each of the plurality of rewind receiving coils and compensating coils including a receiver coil (Nl) and a compensating coil (N) associated with another receiver coil (N), the receiver coil (Nl) is placed at the same distance from the transmitter coil as the compensation coil (N) associated with another receiver coil (N). A further object of the present invention is to provide a new induction logging tool having a tool string length that is shorter than the length of the tool string of the prior art induction logging tool., the new induction logging tool includes a new induction array that appears to be bent about an axis that matches the prior art induction array transmitter of the prior art induction logging tool, the new bent induction array includes a transmitter coil and a plurality of rewind receiving coils and compensating coils, the transmitter coil is positioned at one end of the new bent induction array and the plurality of rewind receiving coils and compensating coils is placed adjacent and to one side of the transmitting coil of the new bent induction array, the length of the new bent induction array is about half the length of the induction array of the prior art induction tool, each of the plurality of coils receivers and rewind compensating coils includes a receiver coil ra (Nl) and a compensating coil (N), associated with another receiver coil (N), which are wound together in the same ceramic coil, the receiver coil (Nl) being placed approximately the same distance from the transmitter coil as the compensating coil (N), each of the plurality of coils receiving and rewinding compensating coils is formed by winding both the compensating coil (N) and the receiver coil (Nl) in a bifiliar manner in the same ceramic coil starting from the center of the coil and winding the receiving coil (Nl) and the compensating coil (N) in opposite directions outwards. In accordance with these and other objects of the present invention, the new induction logging tool has a tool string length that is shorter than the length of the tool string of the induction logging tool of the prior art. The new induction logging tool includes a new induction array that appears to be "bent" about an axis that matches the transmitter of the prior art induction array of the prior art induction logging tool, the "new bent induction array" includes: (1) a transmitter coil, (2) a plurality of "re-wound" receiving coils and compensating coils, (3) a further plurality of individual receiver coils and (4) at least an additional compensating coil The transmitter coil is placed on one end of the new bent induction array; however, the plurality of rewind receiving coils and compensating coils, the individual receiving coils and an additional compensating coil are all placed adjacent to and only on one side of the transmitting coil of the new bent induction array. In the new bent induction array, each of the plurality of rewind receiving coils and compensating coils includes a receiver coil (N1) and a compensating coil (N), which is actually associated with another receiver coil (N), the receiving coil (Nl) and the compensating coil (N) being re-wound together in the same ceramic coil and therefore, they are placed approximately the same distance from the transmitter coil. For each of the rewind receiving coils and compensating coils, the receiver coil (Nl) and the compensating coil (N) which is actually associated with another receiver coil (N) are both placed at approximately the same distance from the coil. transmitter coil because each of the coils receiving and rewinding compensating coils are formed by winding both its compensating coil (N) and its receiver coil (Nl) in a bifilar manner in the same ceramic coil, starting from the center of the coil and winding the receiving coil (Nl) and the compensating coil (N) in opposite outward directions. However, even though it is important that each receiving coil and rewinding compensating coil should be formed by winding the compensating coil (N) and receiver coil (Nl) in the same ceramic coil, remembering that each compensating coil (N) is actually associated with its own, corresponding receiver coil (N), it is also important that the number of turns of the coil for each compensating coil (N) and its corresponding receiver coil (N) be carefully selected. That is, for each receiving coil and rewinding compensating coil, two criteria must exist and be satisfied at the same time. (1) the ratio of turns between the turns of the receiving coil (N) and its corresponding compensating coil (N) must be carefully selected in order to balance or cancel the direct mutual coupling between the transmitting and receiving formation, and (2) still when the above mentioned turns must be carefully selected, the receiving coil (Nl) and the compensating coil (N) associated with another receiving coil (N) nevertheless must be re-wound together in the same ceramic coil. As a result, since the receiving coil (Nl) and the compensating coil (N) are re-wound together, in the same ceramic coil, the compensating coil (N) and the receiving coil (Nl) each is placed approximately at the same distance from the transmitter coil. Consequently, the length of the new bent induction array of the new induction tool of the present invention is about half the length of the induction array of the induction tool of the prior art. A further scope of the applicability of the present invention will now become apparent from the detailed description that will be presented below. It should be understood, however, that the detailed description and specific examples even when representing a preferred embodiment of the present invention, are provided by way of illustration only since various changes and modifications within the spirit and scope of the invention will become apparent to a person skilled in the art when reading the following detailed description.

BRIEF DESCRIPTION OF THE DRAWINGS A full understanding of the present invention will be obtained from the detailed description of the preferred embodiment presented below, and the accompanying drawings, which are provided by way of illustration only and are not intended to be limiting of the present invention, and in where: Figure 1 illustrates a prior art induction logging tool disclosed in the Chandler Patent which also includes an arrangement section, Figure 2 illustrates the induction logging tool of the present invention that is shorter in length than the induction logging tool of the prior art of Figure 1; Figure 3 illustrates in greater detail the induction logging tool of the present invention, shown in Figure 2, which further includes a section of a formation called the new "bent array" in accordance with the present invention; Figure 4 illustrates a detailed construction of the array section of the prior art induction logging tool of Figure 1; Figure 5 illustrates a detailed construction of the new "bent array" section of the induction logging tool of Figure 3 of the present invention; Figure 6 illustrates a more detailed further construction of the new section of the bent array of the induction logging tool of the present invention illustrated in Figure 5, the new section of the bent array includes a "plurality of receiver coils and coils rewinding compensators "; Figures 7 to 12 illustrate views of a more detailed further construction of each of the plurality of rewind receiving coils and compensating coils of Figure 6.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to Figure 1, an induction logging tool 10 of the prior art includes a detector array 12, an electronic section 14, an electronic section 16 of the transmitter and a spontaneous potential adapter 18 (SP ). Although the measurements made by the induction logging tool 10 of the prior art of Figure 1 are accurate and abundant, the length of the tool 10, including the detector array, is approximately 12,192 meters. As a result of this length of 12,192 meters, it may be difficult to place the induction logging tool 10 of the prior art of Figure 1 in boreholes having a minimum bore hole or in boreholes having serious dog legs or in horizontal boreholes that have a short start radius. The array 12 of the prior art induction logging tool 10 of FIG. 1 is discussed in US Pat. No. 5,517,605 to Chandler et al., The disclosure of which has already been incorporated by reference in this specification. Other patents also discuss various other features of the induction logging tool 10 of the prior art of Figure 1, and these other patents include: (1) U.S. Patent Number 5,041,975 issued to Minerbo et al., Addressed to the well correction (2) U.S. Patent No. 5,355,088 issued to Howard Jr. addressed to a method and apparatus for determining invasion parameters, (3) U.S. Patent Number 5,184,079 issued to Barber addressed to a method and apparatus for eliminating effects of an angle of inclination in the data collected, and (4) US Patent Number 5,379,216 issued to Head, addressed to a volume transformation system. The Minerbo and others patent, the Howard Jr patent, the Barber patent and the Head patent each are incorporated by reference into this specification. Referring to Figure 2, an induction logging tool 22 in accordance with the present invention is illustrated. This induction logging tool 22 includes a 22c sensor array, a section 22a of electronics and an electrode 223 of spontaneous potential (SP). However, the length of the mapping tool 22 of the present invention in Figure 2 is approximately 4,877 meters. Compare the length of the induction logging tool 22 of the present invention shown in Figure 2 (4,877 meters) with the length of the induction logging tool 10 of the prior art shown in Figure 1 (12,192 meters). This reduction in the length of the induction logging tool 22 from 12,192 meters to 4,877 meters will allow the induction logging tool 22 of Figure 2 to be placed in boreholes having a minimum borehole or in boreholes having legs of serious dogs, or in horizontal soundings that have a short starting radius. Referring to Figure 3, the induction logging tool 22 of the present invention shown in Figure 2 is illustrated again in greater detail in Figure 3. In Figure 3 the induction logging tool 22 of this invention shown in Figure 3, includes an electronics section 22a including upper uprights 22a, a compensating section 22b, a sensing array 22c (also illustrated as the detector array 22c in Figure 2), a lower pillar 22d and a section 22e of nose. The nose section 22e is disclosed in the pending pending application Serial Number 08 / 330,397, filed on 10/27/94 which corresponds to the number of the lawyer 20.2635 called "Method and Apparatus for measuring mud resistivity in a wellbore including I have tested a bottom electrode located at the bottom of a tool string and propagating a current from and to the bottom electrode in a direction parallel to a longitudinal axis or the tool string ", the arrangement of which is incorporated by reference in this specification . Referring to Figure 4, the detector array 10 of the prior art induction logging tool 10 of Figure 1 is illustrated. This detector array 12 is suitably described in U.S. Patent No. 5,157,605 to Chandler, already incorporated herein by reference. The array 12 detector of Figure 4 includes a transmit coil 12a positioned in the center, a plurality of compensating coils and receiver coils positioned on one side of the transmitter coil 12a and furthermore a plurality of compensating coils and receiver coils positioned on the other side. of the transmitting 12th coil. For example, the following compensating coils and receiver coils exist on a first side of the transmitter coil 12a; the compensating coil 12b of 15.24 centimeters, the receiving coil 12a of 15.24 centimeters, the compensating coil 12d of 30.48 centimeters, the receiving coil 12e of 30.48 centimeters, the compensating coil 12f of 53.34 centimeters, the receiver coil 12g of 53.34 centimeters, the coil compensating 12h of 99.06 centimeters, the receiving coil 12i of 99.06 centimeters and the compensating coil 12j of 182.88 centimeters and the receiving 12k coil of 182.88 centimeters. In addition, the following compensating coils and receiver coils exist on a second side (opposite to first side) of the transmit coil 12a; the compensating 12L coil of 22.86 centimeters, the receiving 12m coil of 22.86 centimeters, the compensating 12m coil of 38.10 centimeters, the receiving 12p coil of 38.10 centimeters, the compensating coil 12q of 68.58 centimeters, and the receiving coil 12r of 68.58 centimeters. In Figure 4, note dotted line 24 passing through the transmitting coil 12a. This dotted line represents a "fold line". Suppose it were possible to bend the second side of the detector array of Figure 4 around the dashed line 24 and to be above the second side of the detector array 12 (which includes the compensating 12L coil of 22.86 centimeters (above) of the first side of the array 12 detector) that includes the compensating coil 12b of 15.24 centimeters). If this "bending operation" were possible, the result of the bending operation "would be the detector array 22c (hereinafter referred to as" the bent array 22c ") shown in Figure 5, in accordance with the present invention.

Referring to Figure 5, the bent array 22c of the induction logging tool 22 of Figures 2 and 3 of the present invention has been illustrated. In Figure 5, the bent array 22c includes a transmitting coil 22cl placed on one side of the array, and (1) a 15.24 centimeter compensating coil 22c5, (2) a plurality of coils receiving and balancing coils 22c2 re-wound (3). ) a further plurality of individual receiving coils 22c3 and (4) at least one additional compensating coil 22c4, all of which are placed on only one side of the transmitting coil 22cl. The transmitting coil 22cl is positioned at one end 26 of the new bent array 22c, and the plurality of coils receiving and balancing coils 22c2 re-wound, the compensating coil 22c5 of 15.24 centimeters, the individual coils 22c3 and the additional compensating coil 22c4 are placed adjacent to and alone on one side of the transmitting coil 22cl of the new bent array 22c. Each of the plurality of receiving coils and compensating coils 22c2 re-wound in Figure 5, includes a receiver coil (N-1) and a compensating coil (N) that is actually associated with another receiver coil (N). In addition, each of the plurality of receiving coils and compensating coils 22c2 re-wound in Figure 5, are formed by winding both the receiving coil (Nl) and its compensating coil (N) in a bi-filtering manner in the same ceramic coil , starting from the center of the coil and winding the receiver coil (N) and the compensating coil (N) in opposite directions outwards. Furthermore, even though it is important that each receiving coil and rewinding compensating coil 22c2 is formed by winding the receiving coil (Nl) and the compensating coil (N) in the same ceramic coil, remembering that each compensating coil (N) is associated with its own corresponding receiver coil (N), it is also important that the number of turns of the coil for each compensating coil (N) and each receiver coil (N) be carefully selected. That is, for each receiving coil and compensating coil 22c2 re-wound, there must be two criteria must be satisfied at the same time. (1) The ratio of turns between the turns of a specific receiver coil (N) and its corresponding compensation coil (N) must be carefully selected in order to balance or cancel the direct mutual coupling between the transmitter array and the receiver, and (2) When the aforementioned turn ratio is selected carefully, the receiving coil (Nl) and the compensating coil (N) associated with another receiving coil (N), however, must be re-wound in the same ceramic coil. When the receiving coil (Nl) and the compensating coil (N) are re-wound in the same ceramic coil, the compensating coil (N) and the receiving coil (Nl) both are placed approximately the same distance from the transmitting coil . As a result, the functional operation of the new doubled array 22c of the present invention of Figure 5 is in the same manner as the functional operation of the prior art detecting array 12 of Figure 4, discussing this functional operation in the Patent. North American Issue 5,157,605 issued to Chandler et al .; however, the new bent array 22c of the present invention of FIG. 5 (a portion of the induction logging tool 22 of FIGS. 2 and 3) is shorter in length than the detector array 12 of the prior art. Figures 1 and 4, thus allowing the new induction diaphragm tool 22 of Figures 2 and 3 to be placed in boreholes having a minimum bore hole, or in boreholes having serious dog legs, or horizontal boreholes that They have a short start radius. Referring to Figure 6, a more detailed additional construction of the new folded array 22c of Figures 2 is illustrated., 3 and 5 of the new induction logging tool 22 of Figures 2 and 3. If it were possible to bend (or rotate) the second side of the induction section 12 of Figure 4 around the dotted line 24 and that is above the second side of the induction section 12 of Figure 4 (which includes the compensating coil 12L of 22.86 centimeters) above the first side of the induction section 12 of Figure 4 (which includes the compensating coil 12b of 15.24 centimeters), previously called a "bending operation", a plurality of the receiving coils and the compensating coils placed on one side of the array 12 of Figure 4, would be above the corresponding plurality of receiving coils and compensating coils placed in the other side of array 12 of Figure 4, and the result would be the new section 22c of the bent array of Figures 5 and 6. The prior art induction logging tool In Figure 4, it includes a plurality of receiving coils and compensating coils. Each of the receiving coils and compensating coils are defined as follows: 1. A receiving coil of 15.24 centimeters and a corresponding compensating coil of 15.24 centimeters. 2. A receiver coil of 22.86 centimeters and a compensating coil of 22.86 centimeters corresponding. 3. A receiving coil of 30.48 centimeters and a corresponding compensating coil of 30.48 centimeters. 4. A receiving coil of 38.10 centimeters and a corresponding compensation coil of 38.10 centimeters. 5. A receiving coil of 53.34 centimeters and a corresponding compensating coil of 53.34 centimeters. 6. A receiving coil of 68.58 centimeters and a corresponding compensating coil of 68.58 centimeters. 7. A receiving coil of 99.06 centimeters and a corresponding compensating coil of 99.06 centimeters. 8. A receiving coil of 144.78 centimeters and a corresponding compensating coil of 144.78 centimeters. 9. A receiving coil of 182.88 centimeters and a compensating coil of 182.88 centimeters corresponding.

Referring to the above list of receiving coils and compensating coils, it is necessary to define a certain nomenclature used in this specification: (1) If the compensating coil (N) consists of a compensating coil of 22.86 centimeters, the receiving coil (N) consists of of a receiver coil of 22.86 centimeters but the receiver coil (Nl) consists of a receiving coil of 15.24 centimeters, the coil previously mentioned in the aforementioned list. (2) Similarly, if the compensating coil (N) consists of a compensating coil of 99.06 centimeters, the receiver coil (N) consists of a receiver coil of 99.06 centimeters, but the receiver coil (Nl) consists of a receiver coil of 68.58 centimeters, the coil previously mentioned in the aforementioned list. In Figure 6, the new bent array 22c includes a transmitting coil 22cl, the compensating coil 22c5 of 15.24 centimeters, the plurality of coils receiving and rewinding compensating coils 22c2, a temperature sensor or detector 22c6, the receiving coils 22c3 individual and the additional compensating coil 22c4 all of which are placed on one side only of the transmitting coil 22cl.The advantage of the new array 22c bent in relation to the detector arrangement 12 of the prior art is as follows: the new bent array 22c of the Figures 5 and 6 are shorter in length than the array 12 detector of Figure 4. This shortened length of the bent array 22c allows the new induction logging tool 22 of Figures 2 and 3 to be placed in boreholes having a hole of minimum sounding, or in soundings that have serious dog legs, or in horizontal soundings that have a short start radius.In Figures 5 and 6, the plurality of Receiving coils and 22c compensating coils re-wound from the new folded 22c array include the following: (1) a 15.24 centimeter receiving coil / 22.86 centimeter compensating coil 2a - in Figures 5 and 6, the 15.24 centimeter receiving coil of the array 12 prior art detector of Figure 4 is wound on the same coil as the compensator coil of 22.86 centimeters of the detector array 12 of Figure 4, (2) a receiver coil of 22.86 centimeters / compensating coil of 30.48 centimeters 2b - in Figures 5 and 6, the receiving coil of 22.86 centimeters of the prior art detector arrangement of Figure 4, is wound on the same coil as the compensating coil of 30.48 centimeters from the array 12 detector of Figure 4, (3) a receiving coil of 30.48 centimeters / compensating coil of 38.10 centimeters 2c - in Figures 5 and 6, the receiving coil of 30.48 centimeters of the array 12 detector of the prior art of Figure 4 is wound on the same coil as the 38.10 centimeter compensating coil from the detector array of Figure 4, (4) a receiving coil of 38.10 centimeters / compensating coil of 53.34 centimeters 2d - at the Figures 5 and 6, the 38.10 centimeter receiver coil from the prior art detector arrangement of Figure 4 is wound on the same coil as the 53.34 centimeter compensating coil from the array 12 detector of Figure 4, (5) a receiving coil of 53.34 centimeters / a compensating coil of 68.58 centimeters 2e - in Figures 5 and 6, the receiving coil of 53.34 centimeters from the prior art detector arrangement of Figure 4, is wound into the same coil as the compensation coil of 68.58 centimeters from the array 12 detector of Figure 4, and (6) a receiver coil of 68.58 centimeters / one compensating coil of 39.06 centimeters 2f - in Figures 5 and 6, the receiving coil of 68.58 centimeters from the prior art detector arrangement of Figure 4, it is wound on the same coil as the compensating coil of 99.06 centimeters from the detector array of Figure 4. From the aforementioned description of the plurality of receiver coils and rewinding compensating coils 22c2, it is evident that each of the plurality of rewind receiving coils and compensating coils 22c2 in Figures 5 and 6 includes a receiver coil ra (N-l) and a compensating coil (N). However, the compensating coil (N) is associated with another receiver coil (N); it is not associated with the receiver coil (N-l) In addition, the plurality of receiver coils and compensating coils 22c2 all re-wound are placed on one side of the transmitter 22cl, the transmitter 22cl 'itself being positioned at the end 26 of the array. The compensating coil (N) and the receiver coil (N-1) of each receiving coil and re-wound compensating coil 22 c2 are wound on the same ceramic coil. As a result, the compensating coil (N) and the receiver coil (N-l) are placed at approximately the same distance from the transmitting coil 22cl. In addition, the ratio of turns for a specific receiver coil and compensation coil [ie, the number of turns of a specific receiver coil (N) divided by the number of turns of its corresponding coil (N)] must be carefully selected in order to balance or cancel the direct mutual coupling between the transmitter and receiver array. Referring to Figures 7 to 12, a detailed construction of each of the plurality of rewind receiving coils and compensating coils 22c2 is illustrated, these illustrations showing the manner in which each coil receiving and co-rolling compensating coil 22c2 is re-wind joints around the same coil and around the same coil pin. In Figure 7, the compensating coil 32, 34 and the receiver coil 38, 40 associated with one of the plurality of rewind receiving coils and compensating coils 22c2 are rewound around a nominal center 36 of a coil 30. As As a result, the compensating coil 32, 34 and the receiving coil 38, 40 are positioned at approximately the same distance "x" from the transmitting coil 22cl. It will be recalled that each of the plurality of rewinding coils and rewinding compensating coils 22c2 co-wind together around the same ceramic coil. Each of the plurality of rewinding receiving coils and compensating coils consists of (1) a compensating coil and (1) a receiving coil. For example, the receiving coil of 15.24 centimeters / compensating coil of 22.86 centimeters consists of the receiving coil of 15.24 centimeters (the receiving coil) and the compensating coil of 22.86 centimeters (the compensating coil). In Figure 7, the compensating coil of a receiving coil and a specific re-coiled compensation coil (one of 2a-2f of 22c2) consists of a first compensating coil 32 (hereinafter referred to as "Buc Cl 32") and a second compensating coil 34 (hereinafter called "Buck C2 34"); and the receiver coil of the same receiver coil and specific re-coiled compensation coil (one of 2a-2f of 22c2) consists of a first receiving coil 38 (hereinafter referred to as "Rec Cl 38), which is interposed in part with the first compensating coil 32, and a second receiving coil 40 (referred to herein as Rec Cl 38"), which is interleaved in part with the second compensating coil 34. Note from the above description that the first receiver coil 38 is "interleaved in part" with the first compensating coil 32, and that the second receiving coil 40 is "interleaved in part" with the second compensating coil 34. The aforementioned reference to "interleaving" will be discussed in more detail below with reference to Figure 10 of the drawings. Therefore, in our example, the receiving coil and the rewinding compensating coil "the receiving coil of 15.24 centimeters / the compensating coil of 22.86 centimeters 2a" includes the receiving coil of 15.24 centimeters and the compensating coil of 22.86 centimeters, being the receiving coil of 15.24 centimeters is represented by a first receiving coil 38 of Figure 7, plus the second receiving coil 40 of Figure 7 (Rec Cl 38 + Rec C2 40), the compensating coil of 22.86 centimeters, being represented by the first compensating coil 32 of Figure 7 plus the second compensating coil 34 of Figure 7 (Buck Cl 32 + Buck C2 34). In a similar way, the receiving coil and the rewinding compensating coil "the receiving coil of 68.58 centímeros / compensating coil of 99.06 centimeters, 2f" includes the receiving coil of 68.58 centimeters and the compensating coil of 99.06 centimeters, the receiving coil being represented by 68.58 centimeters by the first receiving coil 38 of Figure 7 plus the second receiving coil 40 of Figure 7 (Rec Cl 38 + Rec C2 40), the compensating coil of 99.06 centimeters being represented by the first compensating coil 32 of Figure 7 plus the second compensating coil 34 of Figure 7, (Buck Cl 32 + Buck C2 34). Therefore, each receiver coil and rewind compensating coil (2a-2f) 22c2 of Figure 6, consists of a specific receiver coil (Nl) a specific compensation coil (N), the specific receiver coil (Nl) consists of (Rec Cl 38 + Rec C2 40) of Figure 7, the specific compensator coil (N) consists of (Buck Cl 32 + Buck C2 34) of Figure 7. In addition, in Figure 7, the specific receiver coil (Nl) ) and the specific compensating coil (N) both are placed around the nominal center 36, the nominal center 36 being furthermore placed at a distance "x" from the transmitting coil 22cl. Therefore, the specific receiver coil (N-1) and the specific compensation coil (N) are both placed at about the same distance "x" from the transmit coil 22cl. As a result, the receiving coil (N-1) and the compensating coil (N) of each of the plurality of rewinding receiving coils and compensating coils (2a-2f of 22c2) are each placed approximately at the same distance " x "from the transmitting 22cl coil. This concept will be better understood by reading the following detailed description. Figure 7 illustrates the first half of the compensating coil 32 (Buck Cl 32) interleaved with the first half of the receiving coil 38 (Rec Cl 38), and the second half of the compensating coil 34 (Buck C2 34) interspersed with the second half of the receiver coil 40 (Rec C2 40), each one being wound around the nominal center 36 of the coil 30. However, Figure 7 does not exactly illustrate the way in which these coils 32, 34, 38 40 are - winding together around the coil 30. The following discussion with reference to figures 8 to 12 will provide a description of exactly how these coils 32, 34, 38 and 40 are rewound together around the same coil 30 of ceramics. In Figure 8, remembering (from Figure 7) that Buck Cl 32 interleaved with Rec Cl 38 is placed on one side of the nominal center 36 and wound around coil 30, and that Buck C2 34 interleaved with Rec C2 40 is placed on the other side of the nominal center 36 and wound around the coil 30, Figure 8 illustrates the nominal center 36 of the coil 30. However, in Figure 8, a plurality of coil pins 42 are positioned transversely with relation to the nominal center 36, the plurality of coil pins 42 being held together by an epoxy resin 44. The receiver coil and compensating coil 32, 34, 38, 40 of Figure 7 associated with each of the plurality of receiver coils and re-wound compensating coils 2a to 2f of Figure 6, are initially connected to one of the coil pins 42 of the coil 30, before the coils are re-wound around the same coil 30. Figure 9 illustrates better the way in which each b receiving bladder and rewind compensating coil (32, 34, 38, 40) of Figure 7 of the plurality of rewinding receiving coils and rewinding coils (2a-2f) 22c2 of Figure 6 are connected with the pins 42 of coil and re-wound around the same coil 30. In Figure 9, the "Buck Cl 32" portion of the compensating coil of Figure 7 installed with the "Rec Cl 38" portion of the receiver coil of Figure 7 ( associated with one of the coils receiving and rewinding compensating coils 22c2) is shown connected with a coil pin 42 of coil 30. In Figure 9, note how the Buck Cl 32 compensating coil is interspersed with the Rec Cl 38 receiving coil on one side of the nominal center 36 of the coil 30. In Figure 9, the Buck Cl 32 compensating coil includes an end shown as being detached of its outer insulation layer thereby exposing a wire pin 48. The wire pin 48 has an end portion 50 that is physically wrapped around the coil pin 42, one of the coil pins 42 shown in Figure 8. The additional reference in Figure 10 will better illustrate the winding of each of the receiving coils and compensating coils 32, 38 and 34, 40 around the coil 30, when the end portion 50 of each wire pin 48 of either the compensating coil 32, 34 or the coil 38, The receiver 40 is wound around the coil pin 42, in the manner illustrated in Figure 9. In Figure 10, the first half of the compensating coil 32 (Buck Cl 32) is shown interleaved with the first half of the receiving coil 38. (Rec Cl 38) on the left side of the nominal center 36 and wound around the coil 30 in the winding direction indicated by the arrow 52 (upwards in Figure 10). However, note that the turns 32 of the compensating coil are initially interspersed with the turns 38 of the receiver coil; however, when the turns 32 of the compensating coil wind around the coil 30 in the direction indicated by the arrow 52, to the point in Figure 10 indicated by the number 56, the turns 32 of the compensating coil begin to cut through the successive successive turns 38 of the receiving coil. This happens because the compensating coil 32 ends at 56 but the receiving coil 38 continues to wind around the coil 30. As a result, the compensating coil 32 cuts through the various successive turns 38 of the receiving coil. However, the second half of the compensating coil 34 (Buck C2 34) is shown interleaved with the second half of the receiving coil 40 (Rec C2 40) on the right side of the nominal center 36 and is wound around the coil 30 in the winding direction indicated by arrow 54 (downwards in Figure 10). However, note that the turns 34 of the compensating coil are initially interspersed with the turns 40 of the receiving coil; however, when the turns 34 of the compensating coil wind around the coil 30, in the direction indicated by the arrow 54, to the point in Figure 10 indicated by the number 58, the turns 34 of the compensating coil start to be cut through several successive turns 40 of the receiver coil. This happens because the compensating coil 34 terminates at 58, but the receiving coil 40 continues to wind around the coil 30. As a result, the compensating coil 34 cuts through several successive coil turns 40. The end portions 50 of each compensating coil (N) 32, 34 and each receiver coil (Nl) 38, 40 of Figure 7 of each of the plurality of compensating coils and re-wound receiving coils 2a-2f of 22c2 of Figure 7 are wound around the following spool pins 42: (1) the end portion 50 of the first half of the compensating spool 32 (Buck Cl 32) of Figure 7 is initially wrapped around the spool pin. 2 of Figure 10, and compensating coil 32 is wound around coil 30 in the direction of arrow 52 (upwards in Figure 10); (2) the end portion 50 of the first half of the receiver coil 38 (Rec Cl 38) of Figure 7, is initially wound around the coil pin number 4 of Figure 10, and the receiving coil 38 is wound around from coil 30 in the direction of arrow 52 (upwards in Figure 10); (3) The end portion 50 of the second half of the compensating coil 34 (Buck C2 34) of Figure 7, is initially wound around the coil pin number 2 of Figure 10, the compensating coil 34 is wound around the coil 30 in the direction of the arrow 54 (downwardly in Figure 10), and (4) the end portion 50 of the second half of the receiver coil 40 (Rec C2 40) of Figure 7, is initially wound around the coil pin number 7 of Figure 10, and the receiving coil 40 is wound around the coil 30 in the direction of the arrow 54 (downwardly in Figure 10). In Figure 11, portion 32 and 34 of the compensating coil of Figure 10, which cuts through the various successive receiving coils 38 and 40 of Figure 10, is illustrated in greater detail. Since the portion 32 and 34 of the compensating coil abruptly ends at 56 and 58, but the receiving coils 38, 40 continue to wind around the coil 30, the 32 and 34 portions of the compensating coil must cut through the coils 38 and 40 recipients wound successively, and the end of the portion 32, 34 of the compensating coil is welded on the coil pin 42, at 60. In Figure 12, it will be recalled that each of the plurality of coils and coils receivers 2a-2f, 22c2 of Figure 6 includes a compensating coil (N) and a receiver coil (Nl), wherein the compensating coil (N) further includes a first compensating coil 32 (Buck Cl 32) and a second compensating coil 34 (Buck C2 34), and the receiving coil (Nl) further includes a first receiving coil 38 (Rec Cl 38) and a second receiver coil 40 (Rec Cl 40). However, the first compensating coil 32 is interleaved in part with the first receiving coil 38 when the coils 32, 33 are wrapped around a coil 30 in one direction (arrow 52), and the second compensating coil 34 is partly interposed with the second receiving coil 40 when the coils 34, 40 are wound around the same coil 30 in a direction opposite to one direction (arrow 54). Therefore, when the first compensating coil 32 ("Buck Cl 32) and the first receiving coil 38 (Rec Cl 38") are wound in an interleaved manner on one side of the nominal center 36 in the manner shown in Figures 7 and 10, and when the second compensating coil 34 ("Buck C2 34") and the second receiving coil 40 ("Rec C2 40") are wound in an interleaved manner on the other side of the nominal center 36 in the manner shown in the Figures 7 and 10, the result is shown in Figure 12. Having described the invention, it will be apparent that it can be varied in many ways. These variations should not be considered as a deviation from the spirit and scope of the invention, and all those modifications that would be apparent to a person skilled in the art are intended to be included within the scope of the following claims.

Claims (13)

CLAIMS:

1. A logging tool for placement in a sounding well, comprising: an array section, including the array action: a transmitter coil, and a plurality of receiver coils and rewind compensating coils positioned on one side of the transmitter coil .

The graphing tool according to claim 1, wherein the array section further comprises: a compensating coil positioned on one side of the transmitter coil; an individual receiver coil positioned on one side of the transmitter coil; and an additional compensating coil placed on one side of the transmitter coil.

3. The graphing tool according to claim 1, wherein each of the plurality of rewind receiving coils and compensating coils comprises: a coil; and a receiving coil (N-1) and a compensating coil (N) co-rolled together in the coil, the coil; and the compensating coil (N-1) is associated with another receiver coil (N) and not with the receiver coil (N-1).

4. The graphing tool according to claim 3, wherein there is a direct mutual coupling between the transmitter coil and the plurality of rewinding compensating coils and receiver coils, the compensating coil (N) of each of the plurality of compensating coils and rewind receiving coils include a number of turns, and the receiving coil (N) also includes a number of turns, the ratio between the number of turns of the receiving coil (N) and the number of turns of the compensating coil (N) is carefully selected in such a way that the direct mutual coupling between the transmitting coil and the plurality of rewinding coils and re-wound receiving coils is balanced.

The charting tool according to claim 4, wherein the compensating coil (N) and the receiving coil (Nl) of each of the plurality of rewinding receiving coils and compensating coils are positioned at approximately the same distance "x" of the transmitter coil.

6. The graphing tool of claim 5, wherein a section of the array further comprises: a compensating coil positioned on one side of the transmitter coil; an individual receiver coil positioned on one side of the transmitter coil; and an additional compensating coil placed on one side of the transmitter coil.

7. A logging probe adapted to be placed in a borehole, comprising: an array section having one end, the array section includes: a transmitter coil positioned at the end of the array section, and a plurality of offset coils and receiver coils positioned adjacent to and one side of the transmitter coil within the array section.

The logging probe according to claim 7, wherein the plurality of receiving coils and compensating coils comprise: a plurality of compensating coils and re-wound receiving coils.

9. The logging probe according to claim 8, wherein each of the plurality of rewinding coils and receiving coils comprises: a coil; and a receiving coil (N-1) and a compensating coil (N), re-wound together around the coil, the compensating coil (N) being associated with another receiving coil (N).

The logging probe according to claim 9, wherein there is a direct mutual coupling between the transmitting coil and the plurality of receiving coils and compensating coils, the compensating coil (N) of each of the plurality of compensating coils and Rewind coils includes a number of turns, the receiver coil (N) also includes a number of turns, the ratio between the number of turns of the receiver coil (N) and the number of turns of the compensation coil (N) it is carefully selected in such a way that the direct mutual coupling between the transmitting coil and the plurality of receiving coils and compensating coils is canceled out.

11. The logging probe according to claim 10, wherein the take-up spool (N-1) is wound in a first direction around the spool, and the take-up spool (N) is wound in a second direction around the spool, the second direction being opposite the first direction. The diagnostic probe according to claim 11, wherein the compensating coil (N) includes a first number of turns around the coil, the receiving coil (Nl) includes a second number of turns around the coil, the first number of turns of the compensating coil (N) being less than the second number of turns of the receiving coil (Nl). The logging probe according to claim 12, wherein there is a direct mutual coupling between the transmitting coil and the plurality of receiving coils and compensating coils, the compensating coil (N) of each of the plurality of compensating coils and Rewind coils includes a number of turns, the receiver coil (N) also includes a number of turns, the ratio between the number of turns of the receiving coil (N) and the number of turns of the compensating coil (N) it is carefully selected in such a way that the direct mutual coupling between the transmitting coil and the plurality of receiving coils and compensating coils is canceled. SUMMARY OF THE INVENTION A new induction logging tool has a string length of tools that is shorter than the tool string length of the induction logging tool of the prior art. The new induction logging tool includes a new induction array that appears to be bent about an axis that matches the transmitter of the induction array of the prior art induction logging tool. The new bent induction array includes a transmitter coil positioned at one end of the bent induction array, and a plurality of "re-wound" receiver coils and compensating coils a further plurality of individual receiver coils and at least one additional compensating coil placed adjacent to and on one side of the transmitter coil of the new bent induction array. In the new bent induction array, one of the plurality of rewind receiving coils and compensating coils includes a receiver coil (N-1) and a compensating coil (N), associated with another receiver coil (N), which are re-wound together around the same coil, the receiving coil (N-1) and the compensating coil (N) are placed approximately the same distance from the transmitting coil. Each of the plurality of rewinding receiving coils and compensating coils is formed by winding both the compensating coil (N) and the receiving coil (Nl) in a bifilar manner in the same ceramic coil starting from the center of the coil, and winding the receiving coil (Nl) and the compensating coil (N) in opposite outward directions.