MXPA98001279A - Apparatus and method of deployment of instrumen - Google Patents

Abstract

The present invention relates to a bulkhead adapter for use with a downhole tool that is to be pumped through a well casing or drill pipe in a cable. The bulkhead adapter includes a housing assembly having an upper fastening element for connecting the housing assembly to the cable, and a lower fastening element for connecting the housing to the tool. The adapter also has a circular cleaning cup that defines a surface area exposed to a flow of pumping fluid. The cleaning cup is detachably fixed to the housing and has an outer diameter enclosing a projected area greater than the projected area of the tool, measured in a transverse plane to the well casing or drill pipe. Various preferred materials and methods of use are described. The invention can especially improve the pumping of tools down horizontal or highly deviated wells

Description

APPARATUS AND METHOD OF DEPLOYMENT OF INSTRUMENTS This invention relates to an apparatus and method for deploying instruments in oil wells with mud pumping techniques, and is specially designed for use in deviated wells. Once an oil well has been drilled, it is customary to make a log of certain sections of the area with electric instruments. These instruments are sometimes called instruments of the "sounding cable", since -they communicate with the unit of diag- nosis, on the surface -of the well, through an electrical cable with which they are unfolded. In vertical wells, often the instruments are simply lowered to the bottom of the well in the sounding cable. In horizontal or greatly deviated wells, however, gravity is often insufficient to move the instruments to the depths to be recorded. In these situations, it is sometimes necessary to push the instruments along the well with a drill pipe. The logging on a drilling cable with a drill pipe can be difficult, however, due to the presence of the cable. It is uncomfortable and dangerous to extend the electric cable through the entire drill pipe before lowering the instruments into the well.

For this reason, some deployment systems have been developed, such as the Schlumberger Difficult Well Diagnosis System (SDPD), with which the electrical connection between the instruments and the cable at the bottom of the perforation is made afterwards. of descending the instruments to the bottom. In these systems, the electrical instruments are easily deployed with standard drill pipes, and then the wire is introduced into the drill pipe and connected. After performing the log, the cable can be easily uncoupled from the diagnostic probe and removed before removing the probe. The SDPD is very effective and has been widely recognized commercially. In the SDPD and other systems, the cable is remotely connected to the instruments with a connector at the bottom of the hole. One half of this connector is attached to the instruments and lowered into the well in the drill pipe. The other half of the connector is attached to the end of the cable and is pumped, along the drill pipe, with a flow of sludge from the open holes in the bottom of the drill pipe and towards the inside of the hole. The connector is sometimes called a "wet connector" because the connection is made in the flow of drilling mud under conditions that challenge the reliability of an electrical connection.

In well-deviated or horizontal wells, pumping the connector to the bottom of the well can be especially difficult. In these cases, the pumping force exerted on the connector must overcome the friction between the lining of the well or the surface of the drill pipe and, in some cases, must act even against the force of gravity. The challenge presented in pumping the cable connector to the bottom of the well is applicable to pumping any instrument from the borehole cable to the bottom of a well - with a sludge, drilling flow that can, depending on the application and environment of the well. bottom of the well, have a wide range of weights and viscosities.

EXTRACT OF THE INVENTION We have observed that, by providing the cable connector (or other instrument to be pumped downhole) of an appropriately designed adapter with a cleaning cup, a downhole flow restriction can be successfully achieved that can substantially improve the pumping of the connector or instrument along the well, especially in well deviated wells. In accordance with one aspect of the invention, a suitable adapter is provided for use with an instrument - at the bottom of the well to be pumped, through the lining of a well or drill pipe, in a cable. The adapter includes a housing assembly with an upper coupling element, for connecting the housing assembly to the cable, and a lower coupling element, for connecting the housing to the instrument. The cleaning cup can be provisionally coupled to the housing and has an outer diameter around a projected area greater than the projected area of the instrument, measured in a plane -relative to the casing or drill pipe of that well. In some physical representations of the invention, currently preferred, the cleaning cup consists of a resilient material, such as a fluorocarbon elastomer. In other pre-ferred physical representations of the invention, the cleaning cup consists of a material selected from a group consisting of aluminum, bronze, polytetrafluoroethylene and acetal resin. The preferred material, at present, is the acetal homopolymer resin. In some designs, the housing assembly includes a lower section, and an upper section. The upper section of the housing is designed to temporarily couple it to the lower section of the housing, with the cleaning cup held between the two. The lim-piece cup consists of a resilient material compressed between the upper and lower sections of the housing. The housing also includes, in some cases, a retaining pin for the cleaning cup, which extends between the upper and lower sections of the housing, through the cleaning cup. In some cases, the lower section of the housing includes a lower frame which forms a flange and which has an axis extending from the flange, a through the cleaning cup, and where the shaft has a threaded end, and a lower retaining sleeve of the cleaning cup rotatably mounted about the axis, between the rim and the cleaning cup. The upper section of the housing includes a nut with threads for coupling the threaded end of the shaft so as to compress the cleaning cup, and an upper holding sleeve of the cleaning cup rotatably mounted around the shaft between the nut and the cup. cleaning. In some preferred arrangements, at least one of the upper and lower sections of the housing defines an internal surface axially superimposed on an outer surface of the cleaning cup so as to retain the cleaning cup. For some applications, the internal surface defines a frusto-conical surface with a progressive angle, measured with respect to the axis of the cleaning cup, of between about 5 and 10 degrees.

In some physical representations of the invention, the cleaning cup comprises an injection molded material. In some cases, the cleaning cup defines concentric molded adjustment guides, forming adjustable diameters which allow the cleaning cup to be adapted for use in well casings or drill pipes with "different diameters." In some physical representations of the invention, - The housing defines an internal surface for extending the cable through the adapter in order to form an electrical connection with the instrument The upper coupling includes, in some physical embodiments of the invention, a washer to form a seal between the cable and the cable. In some cases, the washer defines a slit that extends through one side of the washer, so that the washer can be replaced without separating the cable from the cable. In other aspects of the invention, the adapter described above is combined with a well-logging probe coupled to the lower coupling of the adapter housing. In another aspect of the invention, an instrument is provided for the bottom of the bore, to be pumped through a borehole or drill pipe into a cable. The instrument for the bottom of the perforation includes a circular cleaning cup coupled to the instrument near its lower end. The cleaning cup defines a surface exposed to a flow of pumped fluid, and is temporarily coupled to the instrument. The blank cup has an outer diameter that surrounds a projected area greater than the projected area of the instrument, measured in a transverse plane to the well casing or drilling pipe. The features described above are combined, in various physical representations of the invention, as necessary, to meet the needs of a given application. According to another aspect of the invention, a method is provided for pumping an instrument through the well casing or drill pipe in a cable. The method includes the following steps: (1) provide -an adapter for the cleaning cup equipped with a housing assembly, with an upper coupling fitting -to connect the housing assembly to the cable, and a lower coupling fitting for connecting the housing - to the instrument, and a circular cleaning cup defining - a surface exposed to a flow of pumped fluid (and the cleaning cup being temporarily coupled to a projected area greater than the projected area of the instrument, measured in a transverse plane to the lining of the well or drill pipe); (2) attach the instrument to the lower coupling of the cleaning cup adapter; (3) Attach the cable to the upper adapter coupling of the cleaning cup; (.4) place the instrument and adapter of the cleaning cup in the well casing or -drilling pipe; and (5) pumping fluid through the well casing to push the cleaning cup adapter and the coupled instrument through the well casing or drill pipe. In some physical representations of the invention, the method also includes the step of adjusting the adapter of the cleaning cup to an appropriate diameter, the diameter of the well casing or drill pipe. The cleaning co-pa is preferably adjusted to an outer diameter of approximately 0.254 cm less than the diameter of the well casing or drill pipe.

BRIEF DESCRIPTION OF THE DRAWINGS Figures 1-5 illustrate in order the use of an electrical connector remotely coupled to a well -diagraph probe. Figures 6A-6C illustrate the construction of the -middle of the connector used at the bottom of the borehole (CCFP) of Figure 1. Figure 6D is a cross-sectional view taken along line 6D-6D in Figure 6B. Figures 7A-7C illustrate the construction of the -middle corresponding to the cable of the connector CCCBD) of Figure 1. Figure 7D is a cross-sectional view taken along the line 7D-7D in Figure 7B. Figure 8 shows an alternative arrangement of the upper end of the CCBD. Figure 9 illustrates a function of the cleaning cup in a pipe. Figure 9A shows a cleaning cup located at the lower end of an instrument. Figure 10 is an enlarged and exploded view of the cleaning cup and related components. Figure 11 is an enlarged view of the set of female connectors of Figure 7B. Figure 12 is an exploded view, in perspective, of a subset of the set of female connectors of Figure 11. Figure 13 is an enlarged view of area 13 in Figure 11. Figure 14 is an enlarged view of the multi-pin connector of Figure 7B .

Figure 15 is a view of the connector, as would be seen from position 15 in Figure 14.

DESCRIPTION OF THE PREFERRED PHYSICAL REPRESENTATIONS OF THE INVENTION Referring first to Figures 1 through 5, the connection system at the bottom of the borehole is suitable for use with survey probes with cable drilling -10 both in an untubed well and in a cased well 12, and especially It is useful in situations where the well is - deviated and / or the area to be registered (ie, zone 14) is at a considerable depth. In these figures, the well 12 has a horizontal section 16 that must be registered in the area 14, and is lined with a pipe -18 extending from the surface of the well to the shoe of the casing pipe 20. As shown in FIG. shown in Figure 1, the log probes 10 are provided with a wet connection head at the bottom of the bore (CCFP) 22 which is connected between an upper end of the log probes and the drill pipe 24. As shown in FIG. will explain later, the CCFP 22 provides a male section of an electrical connection - at the bottom of the perforation to establish an electrical communication between the diagnostic probes 10 and a mobile recording unit 26. During the first step of the procedure of In FIG. 12, the probes 10 and CCFP22 are descended in the well 12 in connected sections of standard drill pipe 24 until the probes 10 reach the upper end of the pipe section. well to be registered - (that is, the upper part of zone 14). The drill pipe 24 is lowered using standard techniques and, while the drill pipe is not opened to allow the flow of fluid from the well, at regular intervals (ie, every 600 to 900 meters) the pipeline -perforation is filled with drilling fluid (ie, -loop). As shown in Figure 2, when the probes 10 have reached the top of the zone 14, a wet connection head is pumped in the downward direction (CC BD) 28 through the inner surface of the drill pipe in an electrical cable 30 which is unwound from the logging unit 26. The CCBD28 has a female connector which is coupled to the male connector of the CCFP. A secondary side cable entry (ELSC) 32, where pre-cable 30 has been introduced to provide a cable outlet from the spliced perforation pipe, -is coupled to the upper end of the perforation pipe 24, and a sludge cover 34 (that is, from an upper drive of the sounding train or sludge circulation system of the "Kelly" transmission rod) is coupled onto the ELSC 32 to pump the sludge, downward, through the internal surface of the perforation pipe. For this purpose normal mud pumping equipment (not shown) is used. As will be described later, a cleaning cup constructed especially in the CCBD helps to develop a pres- sure force in the CCBD28, due to the mud flow down the drilling pipe, to push the CCBD to the bottom of the well and join it to the CCFP22 to form a -electric connection. A special valve (described later) in the CCFP22 allows the mud flow to flow from the drilling pipe to the inner surface of the well. As shown in Figure 3, the CCBD28 is pumped downstream by the perforation pipe 24 until it engages with the CCFP22 to form an electrical connection between the survey probes 10 and the -diagraph unit 26. At this point , the mud flow can be stopped and the mud cover 34 can be removed from the upper part of the perforation pipe. The diagnostic probes 10 can be activated to verify the operation of the system or to perform a preliminary sounding while they are lowered to the bottom of the well. As shown in Figure 4, the survey probes 10, the CCFP22 and the CCBD28 are lowered or pushed to the bottom of the well by the normal methods with the drill pipe, adding other drill pipe sections 24 as needed. During this process, the ELSC32 remains coupled to the perforation pipe, providing a lateral outlet for the cable 30. Above the ELSC32, the cable 30 rests on the outside of the perforation pipe 24, avoiding having to -seat the cable 30 through any section of the perforation pipe except for the ELSC32. The descent process is coordinated between the operator of the logging unit and the operator of the drill pipe to simultaneously lower the drilling pipe and the cable. At the bottom of the well, the sensing fingers or devices of the cushion 36 of the diag- nostic probe (if equipped) are deployed, and the probes are removed by drawing them up the well to the top of zone 14 while the readings of the sensors are recorded in the well's logging unit 26. As with the descent process, the rise of the logging probe is coordinated between the operator of the logging unit and the drill pipe operator In order to raise the cable and the drill pipe simultaneously. Referring to Figure 5, after the completion of the graph, the background potency of the perforation is deactivated and the CCBD28 is decoupled from the CCFP22 and extracted from the -spark. The ELSC32 and CCBD28 are removed from the drill pipe and the rest of the pipeline, including the CCFP and the logging probes are removed. Referring to Figures 6A to 6C, the CCFP22 contains two main sub-assemblies, the compensation cartridge of the bottom connector of the perforation - (CCCP) 38 and the retention assembly of the wet connector of the bottom of the perforation (CRCP). . The lower end 41 of the CCCP38 is connected to the diagnostic probes 10 (see Figure 1). The CRCP40 is the upper end of the CCFP22, and has an outer housing 42 which is connected, at its lower end, to the CCFP38 in a threaded joint 44 (Figure 6B). Attached to the inner surface of the housing of the CRCP42-with threaded fasteners 46 is a latch assembly containing three cantilever detent fingers 48 extending radially inwardly and toward the CCCP to secure the CCBD28. Two axially separated centralizers 50 are also secured around the inside of the -ccommodation of the CRCP42 in order to guide the lower end -of the CCBD to couple it with the set of male connectors 52 of the CCCP. The CCCP38 contains the electrical and hydraulic components of the CCFP. It has an external housing 54 - coupled by a threaded joint 55 to a lower block 56 with internal threads 57 at its lower end to temporarily join the CCFP to the diaphragm probes. At the upper end of the housing 54 is a threaded joint 58 which connects the housing 54 to a coupler 60. Semi-threaded ends 62 in the seals 44, 55 and 58 allow the housing components of the CCFP54, 60, 42 and 56 are coupled without rotating either end of the -CCFP. Block 56 contains an electrical connector with a hermetic frame 64 for making the electrical connection of the FP FP with the diagnostic probes. One function of the CCCP38 is to provide exposed electrical contacts (in the form of a set of male connectors 52) which are electrically coupled to the diagnostic probes by the connector 64. This electrical coupling takes place through a multi-wire cable 66 which - extends upwards through a cable chamber -hemetic 68, towards the individual contacts 102 of the connector assembly 52. The cable 66 extends upwards through an oil tube 71, through the center of the CCFP . The chamber 68 is sealed by individual contact gaskets 70 in the connector assembly 52, seals 72 in the oil tube 71, seals 74 and 76 in the piston 77, and gaskets 78 in the block 56, and is filled with an electrical insulating fluid, such as silicone oil. The pressure in chamber 68 is maintained approximatively to the pressure inside the perforation pipe 24 (Figure 1), near the top of the CCFP22, by the pressure compensation system described more fully below. A sludge piston assembly 80 (Figure 6B), consisting of a piston 82, a piston collar 84, a piston stop 86, joints 88 and sliding friction reducers 90, is deflected, upwardly, against the nut. piston limiter 92, by a spring of the piston of the -94 piston. With the piston assembly of the mud in the position shown, with the stop 86 against the nut 92, the piston 82-effectively blocks the fluid preventing it from moving between the circular crown of well 96 (the area between the perimeter pipe and the inner surface of the well; see Figure 1) and the inside of the perforation pipe (i.e., the interior area 98) through three side ports 100 distributed around the CCFP diameter. When operating, the mud piston assembly 80 remains in this position to lock the ports until there is sufficient pressure in the inner area 98 in excess of the circular crown of the pore 96 (acting against the upper end of the piston). 82) to overcome the preload force of the spring 94 and move the mud piston assembly downward, compressing the spring 94 and exposing the ports 100. Once exposed, the ports 100 allow a normal-frontal flow of the mud. descending along the perforation pipe and exiting ports 100 into the well. Once the pumping pressure is stopped, the mud piston spring 94 forces the sludge assembly 80 back to its port blocking position. By blocking the ports 100 in the housing of the CRCP42, in the absence of pumping pressure in the perforation pipe, the sludge piston assembly 80 effectively prevents unwanted flow of water from the well into the pipeline. of perforation. This is especially useful when trying to avoid an explosion of the well through the drill pipe, and that the waste transported by the mud from the well interferes with the proper functioning of the coupling and electrical sections of the system. Tam-bi n helps prevent the return of fluid, where a sudden inrush of well fluids and the resulting upward mudflow in the drill pipe can cause the CCFP and the CCBD to break up prematurely. The male connector assembly 52 is composed of a series of nine contact rings 102, each of them sealed by two seals 70 and separated by insulators 104. The interior of this set of contact rings and insulators is at the chamber 68, while the exterior of this assembly is exposed to the pressure of the perforation pipe (ie, the pressure of the inner area 98). In order to maintain the structural integrity of this set of connectors, in addition to the reliability of the seals 70, it is important that the difference of pressure through the set of connectors (ie, the difference between the pressure in the chamber 68 and the presidency in area 98) is maintained at a low level. A large pressure difference (ie, greater than 100 psi) can cause seals 70 to fail or, in extreme cases, the connector set-collapse, even a minimum leak of drilling mud with electricity con- through the seals 70 inside the chamber 68, due in part to a large difference between the pressure of the perforation pipe and the pressure in the chamber 68, can have a negative effect on the reliability of the electrical systems. The pressure compensation system maintains the pressure difference across the set of male connectors within a reasonable level, and deflects the pressure difference so that the pressure in chamber 68 is slightly higher (more than 50 and 100 psi). ) that the pressure in area 98. This "overcompensation" of the pressure in chamber 68 causes any tendency to leakage to result in a leakage of non-conductive silicone oil from chamber 68 to area 98, rather than a perforation slurry flow conductors of electricity to the chamber 68. A circular crown 106 around the oil tube 71, formed in part between the oil tube 71 and the mud shaft 108 concentrically surrounding the oil tube 71 , transmits the pressure of the drilling mud from the area 98, through the holes 110, to act against the upper side of the puddle 77. The pressure of the mud is transferred through the puddle 77, sealed by the joints tdrica s 74 and 76, inside the oil chamber 68. During the assembly of the CCCP, the chamber 68 is filled with an electrically insulating fluid, such as silico-na oil, through a one-way oil fill check valve 112 (Figure 6D), such as a Lee check valve CKFA1876015A . To properly fill the oil chamber, a vacuum cleaner is first applied to the chamber through a purge port 114. With the aspirator applied, the oil is reintroduced into the chamber 68 through the purge port 114. This it is repeated several times until the camera has been completely filled. The vacuum cleaner is then removed, the port 114 is sealed with a plug 116, and more oil is pumped into the chamber 68 through a check valve 112, by extending a compensating spring 118, until an opening is opened. pressure limiting check valve 119 on the piston 77, indicating that the pressure in the chamber 68 has reached a desired level above the pressure in the chamber 98 (which, during the filling process, is generally found in the chamber 98). you to atmospheric presidn). When the valve 119 indicates that the desired pressure has been reached (preferably -50 to 100 psi, typically), the oil fill tube is removed from the one-way check valve 112, leaving the chamber 68 pressurized. The filling ports of the mud chamber 120, in the coupling 60, allow the circular crown of the -106 cycle and the internal volume above the piston 77 to be pre-filled with a recommended lubricating fluid, such as motor oil. , before use in the field. The lubrication fluid typically remains in the CCFP (specifically in the annulus 106 and the volume above the piston 77) during use in the well and is not easily displaced by the drilling mud, thus simplifying the maintenance of the instruments. - In addition to the lubrication fluid, the application of abundant friction reducing material, such as LUBRIPLATE TM, is recommended on all sliding contact surfaces. Referring to FIGS. 7A to 7C, the CCBD28 has a set of female connectors 140 which is coupled to the set of male connectors 52 of the CCFP22 at the bottom of the perforation. While lowering the CCBD to the bottom of the well, before coupling the CCFP, a sleeve 142 of an electrical insulating material is deflected to the lower end of the CCBD. A four-ring gasket 144 forms a seal against the outer diameter of the sleeve 142 to keep the well fluids out of the CCBD until the sleeve is displaced by the male connector of the CCFP. A projection with the conical bottom 146 helps to align the -CCBD to couple it with the CCFP. When pushed into the CCFP by a sufficient inertia load or mud pressure, the lower end of the CCBD extends through the retention fingers 48 of the CCFP (Figure 6A) until the retention fingers close to preside behind a retaining ring - refundable 148 in the CCBD. As soon as the holding ring 148 is coupled by the retention fingers of the CCFP, the decoupling of the CCFP and CCBD will remain, that is, due to the movement of the perforation, vibration or fluid re-flow pipe. The retaining ring 148 can be selected from a range of rings with different maximum shear strengths (ie, from 1600 to 4000 pounds, depending on anticipated field conditions) so that the CCBD can be released from the CCFP, then to re-collect data, simply by pulling up the deployment cable until the retaining ring 148 opens and - release the CCBD. The CCBD has an outer housing 150 and a welded assembly for a cable clamp connected by a coupler 154 and appropriate threaded rings 156. Within the outer housing 150 is a subset of cable mandrels with an upper mandrel 158 and a lower mandrel 160. The grooves 162 in the upper mandrel and the holes 163 (Figure 7D) through the outer housing form a flow path open from the inside of the drill pipe to a mud chamber 164 within the subset of cable mandrels. The signal cables 165 of the set of female connectors 140 are directed between the outer housing 150 and the cable jacket., along axial grooves on the outer surface of the lower mandrel 160, through holes 166 in the upper mandrel 158, through the cable cavity 168, and individually connected to the lower pins of the connector assembly 170. Al Like the CCFP, the CCBD has a pressure compensation system to equalize the pressure through the sleeve 142 while maintaining the electrical components surrounded by an electrical insulating fluid, such as silicone oil, until the cuff is displaced. Inside the lower mandrel 160 there is an oil chamber 172, separated from the mud chamber 164 by a cam peg 174 with a water seal 175. The piston 174 can move freely inside the lower mandrel 160, so that the pressure in the mud and oil chambers it is substantially the same. Upper and lower springs 176 and 178 are located within the mud and oil chambers 164 and 172, respectively, and deflect the sleeve 142 downward. The oil chamber 172 communicates, by fluid, with the cavity of the cable 168 and by means of the cable routing grooves in the lower mandrel 160 and cable holes 166 in the upper mandrel 158, sealed against the pressure of the cable. perforation pipe by joints 180 around the upper mandrel. Therefore, with the sleeve positioned as shown, the fluid in the perforation pipe acts against the upper end of the compensating piston 174, which transfers the pressure to the oil chamber 172 and the upper end of the sleeve 174, balancing the pressure forces of the fluid in the sleeve. The filling ports' 182 and 184, at the upper and lower ends of the oil-filled section of the CCBD, respectively, make it possible to fill the oil chamber 172 and cable cavity 168 after assembly. A safety valve 186 in the compensating piston allows the oil chamber to be pressurized in the assembly to a maximum of 100 psi over the pressure in the mud chamber 164 (ie, atmospheric pressure during assembly). The upper end of the CCBD provides an electrical and mechanical connection with the sounding cable 30 (Figure 2). The connector assembly 170 has nine electrically insulated pins, each with an insulated flexible connector cable 188 for making electrical connections to individual wires of the cable 30. A connector clamp 189 is screwed to the exposed end of the coupling 154 to hold the connector in position. The specific construction of the connector assembly 170 is discussed in more detail below. To mount the upper end of the CCBD to the cable, the cable gland housing 152 is screwed-first onto the end of the cable, together with the split cable seal 190, sealing nut 192, and mandrels of the upper and lower cleaning cups. and 196, respectively. A standard self-tensioning cable gland fastener 197 is placed around the end of the cable to secure the end of the cable to the housing of the cable-lock casing against an inner flange 198. The cable threads are connected to the flexible connection cables 188 of the cable assembly. connectors, the housing of the bushing 152 is joined to the coupling 154 with a threaded ring 156, and in the housing of the cable gland is pumped electrical insulating grease, such as silicone grease, through grease holes 200. The cleaning cup 202, described in more detail below, is installed between the mandrels of the upper and lower cleaning cups 194 and 196 to restrict the flow, through the perforation pipe around the CCBD, and disengage. To develop a pressure force capable of moving the CCPE along the length of the drilling pipe and coupling the CCBD to the CC FP at the bottom of the drilling. The mandrel of the upper cleaning cup 194 is threaded into the housing of the cable tie 152 to hold the cleaning cup 202 in position., and the sealing nut is tightened. Referring to Figure 8, an alternative arrangement for the upper end of the CCBD consists of two cleaning cups 202a and 202b, separated by a distance L, to -restrict more the flow around the CCBD. This arrangement is useful when you are going to use light, low viscosity sludge to pump, for example. An extension of the housing of the cable gland 204 appropriately connects the mandrels to the two cleaning cups. You can also use more than two cleaning cups. Referring to Figure 9, the cleaning cup -202 creates a restriction of the flow with the corresponding -dress drop at point A. Since the rising pressure (ie, the pressure at point B) is greater than -the Descending pressure (ie, the pressure at point C), a net force develops in the cleaning cup to push the cup and its instrument coupled down. As shown in Figure 9A, a cleaning cup (i.e., cleaning cup 202C) can alternatively be placed near the bottom of an instrument 206 for pulling the instrument toward the bottom of a pipe. or well. This arrangement can be particularly useful, for example, to center the instrument in order to protect extended functions near its descending end or with large-diameter relationships of the pipe / instrument or small diameter ratios to the length of the instrument. The desired radial space f between the outer surface of the cleaning cup and the inner surface of the pipe is a function of several factors, including the viscosity of the fluid. We have observed that a radial space of approximately 0.127 cm per side (ie, a diametral space of 0.254 cm) is suitable for most well drilling muds. Referring to Figure 10, the cleaning cup 202 is injection molded using a resilient material such as VITON or other fluorocarbon elastomer, and has a slit 210 on one side to facilitate installation and removal without the need to unhook the cable from the cable. instrument. The conical sections 214 and 216 of the cleaning cup fit within the corresponding holes in the mandrels of the upper and lower cleaning cup 194 and 196, respectively, and have exterior surfaces inclined about 7 degrees with respect to the longitudinal axis of the cup. the cleaning cup. The length of the cdnicas sections helps to retain the cleaning cup inside the holes of the housing. Likewise, six bolts 217 extend through the holes 218 in the cleaning cup, between the mandrels of the upper and lower cups, to hold the cleaning cup during use. Circular guides 219 stamped on a surface of the cleaning cup help to adjust the cup to different external diameters to adapt it to various sizes of pipe. Other resilient materials may be used for the cleaning cup, although, ideally, the cleaning cup material must be able to withstand the severe abrasion that may occur along the walls of the pipe and the wide variety of chemicals that can be found in wells. Other non-resilient materials that may be useful are also soft metals, such as bronze or aluminum, or hard plastics, such as polytetrafluoroethylene (TEFLON ™) or acetal homopolymer resin (DELRIN ™). The non-resilient cleaning cups can be formed into two superimposed pieces to be installed on a pre-assembled instrument. Referring to Figure 11, the set of female connectors 140 of the CCBD has a series of female contacts 220 arranged around a common axis 222. The contacts have a linear separation, d, which corresponds to the separations of the male contacts of the assembly. of larger connectors of the CCFP (Figure 6A) and a sliding joint 224. The contacts 220 and the friction sealing rings 224 are supported within a respective isolator 226. The contact stack, rubbing and insulating sealing rings are fastened inside an outer sleeve 228, between a fixator-end 230 and an upper mandrel 232. Referring also to Figures 12 and 13, each contact 220 is made from a single piece of material electrical conductor, such as beryllium copper, and has a portion composed of a sleeve 234 with eight -extensive fingers 236 (preferably six or more). The contact -220 is preferably gold plated. Each of the two 236 is shaped to bend radially inwardly, in other words, to have, from the portion of the sleeve 234 to the distal end 237, a main section 238 - which extends radially inward and a section is - secondary 240 extending radially outwards, forming a radially innermost section 242 with a contact length d of approximately 0.381 cm. In manufacturing contact 220 of a single piece of material, fingers 236, in their relaxed state as shown, have no residual bending stresses that tend to reduce their resistance to fatigue. The inner diameter d. of the contact 220, as measured between the contact surfaces 242 of exposed fingers, is slightly smaller than the external diameter of the male electrical contacts 102 of the CCFP (Figure 6A), so that the fingers 236 are pushed outwards during coupling with the male connector and provide a contact pressure between the contact surfaces 242 and the male contacts 102. The circumferential width, w, of each finger is minimal at the contact surface 242. We have observed that in making the contact so that the length d of the contact surfaces 242 is about one quarter of the total length df of the fingers, and the radial thickness, t, of the fingers is about 75 percent-of the radial distance, r, between the internal surface of the sleeve portion 234 and the contact surfaces -242, results in a contact construction that supports repeated couplings. The friction seal rings 224 are preferably molded with a resilient fluorocarbon elastomer, such as VITON ™. The internal diameter d_ of the friction sealing rings 224 is also slightly smaller than the external diameter of the male contacts, so that the sealing sealing rings tend to rub the residues of the surface of the male contacts during coupling. Preferably, the internal diameters d, and d? of contacts and friction seals are approximately equal. The friction sealing rings 224 are molded with an electrical insulating material to reduce the possibility of causing a short circuit between the contacts in the presence of electrically conductive fluids. The contact 220 has a soldered terminal 224 installed on one side of the portion of its sleeve 234 for electrically co-connecting a cable 246. As shown in FIG. 12, as the contact 220 is inserted in the insulator 226. , the wire 246 is directed through a hole 248 in the insulator. Alignment pins 250 in other holes 248 in the insulator fit in the outer grooves -252 of the rubbing sealing ring 224 to align the sealing ring with the insulating material. A notch 254 in rubbing sealing ring fits around the welded terminal 244. The insulators 226 and the rubbing sealing rings 224 are formed with enough holes 248 and grooves 252, respectively, to be able to direct all the wires 246 from each contact 220 in the connector female to the upper end of the assembly for attaching it to the obturator ring assembly 170 (Figure 7B). With the contact 220 inserted in the insulator 226, the distal ends 237 of the contact fingers rest within an axial groove 256 formed by an internal lip 258 of the insulator. The lip 258 protects the distal ends of the fingers so that they do not snag on the surfaces of the plug-set of connectors when the CCBD of the CCFP is decoupled.

Referring to Figure 14, the connector set 170 of the CCBD has a molded connector assembly 280 with an electrical insulating material, such as polyethylacetone, polyethylethracetone or polyarylethracetone. The frame 280 is designed to withstand a high static differential pressure of up to 15,000 psi, for example, through an O-ring in a groove of the gasket 281, and has holes-with outlet 282 into which spikes are inserted. electrical conductors 284 attached to lead wires 286. (Lead wires 286 form flexible connection cables 188 -from Figure 7B). The stainless steel pins 17-4, gold-plated 284, are inserted in position until their lower flanges 288 rest against the bottom-reaming bores 290 in the connector frame. In order to seal the separation surface between the housing of the connector and the lead wires, a cable seal 292 is molded in position around the wires and the connector assembly after stripping the insulation on the lead wires. to obtain a better adhesion to the sealing material. The shutter 292 will also have to withstand high differential pressures of up to 15,000 psi as supported by the set of connectors. We have observed that some high temperature fluorocarbon elastomers, such as VITON ™ and KALREZ ™, give good results for the strand 292.

To form an arc-shaped barrier between the adjacent pegs 284, and between the pegs and the coupling 154 (Figure 7B), on the face of the connector frame 280, individual insulators 296 are molded in the air-to-air position of each of them. the pins 284 between their lower and upper flanges, 288 and 298, respectively. The insulators 296 extend outward, through the plane of the face 294 of the connector frame, about 0.3048 cm, and are preferably molded of a high temperature fluorocarbon elastomer t 'a'l' such as VITON ™ or KALREZ ™. The insulators 296 offer protection against the formation of electric arcs that may occur along the face 294 of the connector frame if, for example, wet air or liquid water is infiltrated in the cavity of the cable 168 of the CCBD (Figure 7B). . In addition to protecting against the formation of unwanted electric arcs, the insulators 296 also serve to prevent the humidity of the connection from penetrating between the pins 284 and the lead wires 286 inside the connector frame during storage and transportation. . Referring also to Figure 15, the frame -of the connector 280 has an external diameter d, of approximately 2.413 cm in order to fit within the small internal diameters of the instruments (up to a minimum of 2.54 cm, for example), typical fact in the instruments used in the bottom of the perforation. The installed connector has a circular array of nine pins 284, each with corresponding insulator 296 and lead wire 286.

Claims (10)

1. An adapter designed to be used in an instrument at the bottom of a perforation and that must be pumped through the lining of the well or perforation pipe in a cable, comprising the following: a housing assembly composed of a coupling top to connect the housing assembly to the cable, and a lower coupling to connect the housing to the instrument? and, a circular cleaning cup forming a surface exposed to the flow of a pumped fluid, the cup being temporarily attached to the housing and having an outer diameter surrounding a projected faehage greater than the projected area of the instrument, measured in a transverse plane -coating of the well or perforation pipe.

2. The adapter of claim 1, wherein the housing assembly comprises the following: a lower section of the housing; and, a top section of the housing designed to be provisionally joined to the lower section of the housing, with the cleaning cup retained -between the two sections. The adapter of claim 2, wherein the cleaning cap consists of a resilient material compressed between the upper and lower sections of the housing. The adapter of claim 3, wherein the -accommodation further comprises a retaining pin for the cleaning cup, extending between the upper and lower sections of the housing, through the cleaning cup. 5. The adapter of claim 3, wherein the lower housing comprises the following: a lower frame forming a flange and containing an axis extending from the flange through the cleaning cup, said axis being a portion with a threaded end; and a lower sleeve for the retainer of the cleaning cup mounted rotatably about the axis between the rim and the cleaning cup; and, the upper section of the housing - comprising the following: a threaded nut for coupling the section of the threaded end of the shaft in such a way as to prime the cleaning cup; and, an upper sleeve of the wiper cup retainer rotatably mounted around the shaft between the nut and the cleaning cup. The adapter of claim 3, wherein at least one of the upper and lower sections of the housing forms an internal surface that is axially superimposed on an external surface of the cleaning cup such that it retains the cleaning cup. The adapter of claim 6, wherein said inner surface forms a frusto-conical surface with a progressive angle, measured with respect to the axis of the cleaning cup, of between about 5 and 10 degrees. The adapter of claim 1, wherein the housing forms an internal surface for extending the -cable through the adapter in order to make an electrical connection with the instrument, and wherein the upper coupling comprises the following: a washer to form a -loop it between the cable and the housing; and, an eyelet nut to compress the washer around the cable. 9. An apparatus comprising the adapter of claim 1 and a well-logging probe attached to the lower coupling of the adapter housing. 10. The apparatus of claim 9, wherein the instrument further comprises: a circular cleaning cup attached to the instrument, near its lower end, the cleaning cup forming a surface exposed to a pumped-fluid flow, the cleaning cup provisionally attached to the instrument and having an external diameter around a projected surface greater than the projected area of the instrument, measured in a transverse plane to the coating of said well or perforation pipe.