CN111878006A - A compound swirl hydraulic centralizer - Google Patents

Abstract

The invention discloses a composite swirl hydraulic centralizer, comprising a coupling, a central pipe, a roller rotating centralizing device, a centralizing sleeve, a hydraulic device, a backstop ring, a hydraulic variable diameter centralizing device, a conical ring platform, and a lower joint. The right end of the coupling is connected with the left end of the central tube, and the roller rotating centralizing device, the centralizing sleeve, the hydraulic device, the backstop ring, the hydraulic variable diameter centralizing device, and the conical ring platform are successively sleeved in the center adjacently. On the pipe, the right end of the central pipe is connected with the left end of the lower joint; the roller rotating and centralizing device includes a ball hole, a swirl vane, and a ball; the hydraulic device includes a liquid cylinder, a piston, and a pressure transmission hole; the hydraulic The variable diameter centralizing device includes a moving seat, a centralizing strip, and a fixed seat. The invention can not only effectively solve the problems of high running resistance and poor adaptability to irregular wellbore diameters of the existing centralizer, but also assist in removing the remaining cuttings and dead slurry at the wellbore during drilling and cementing operations.

Description

A compound swirl hydraulic centralizer

technical field

The invention relates to the technical field of oil and natural gas drilling and completion, in particular to a composite cyclone hydraulic centralizer for fixing and centralizing casing.

Background technique

In the well completion process of drilling, especially in the well completion process of directional wells, horizontal wells and extended reach wells, the casing centralizer is a necessary supporting device. The centralizer makes the casing centered in the wellbore, which can not only reduce the friction resistance during the running process of the casing, but also ensure the uniform annular gap between the casing and the well wall. In cementing operations, uniform annulus is an important parameter to ensure cementing quality; in staged fracturing operations, the uniform annulus promotes the even sealing of the segmented packer in the wellbore, preventing the occurrence of fracturing fluid interaction between sections. channeling. The existing rigid casing centralizer has a large outer diameter and a fixed diameter, and has a large resistance when running into the wellbore, which is not suitable for places where the well diameter is enlarged. However, the existing spring centralizer has the problem that the expansion outer diameter is limited and the supporting force is insufficient.

In addition, during the normal circulation of mud and cement during drilling, due to the uneven shape of the borehole wall, there will be debris residue and dead slurry in the horizontal well section, and the limited mud displacement and flow range cannot completely carry away the retained debris. and dead slurry, and these substances will cause poor cementing and sealing quality and open-hole packer sealing quality, which will affect the later oil and gas production. However, the existing centralizer has a single function and cannot help to clear the dead slurry and cuttings in the wellbore.

SUMMARY OF THE INVENTION

In view of the above problems, the present invention aims to provide a composite cyclone hydraulic centralizer, which can not only effectively solve the problems of high running resistance and poor applicability to irregular wellbore diameters of the existing centralizer, but also can be used in drilling and cementing wells. During the operation, it assists in removing the remaining cuttings and dead slurry at the well wall.

The technical scheme of the present invention is as follows:

A composite swirl hydraulic centralizer, comprising a coupling, a central pipe, a roller rotating centralizing device, a centralizing sleeve, a hydraulic device, a backstop ring, a hydraulic variable diameter centralizing device, a conical ring platform, and a lower joint,

The right end of the coupling is connected with the left end of the central tube, and the roller rotating centralizing device, the centralizing sleeve, the hydraulic device, the backstop ring, the hydraulic variable diameter centralizing device, and the conical ring platform are successively sleeved in the center adjacently. On the pipe, the right end of the central pipe is connected with the left end of the lower joint;

The roller rotation centering device includes a centering body, a ball hole and a swirl blade are arranged on the centering body, a ball matching the ball hole is arranged in the ball hole, and the maximum outer diameter formed by the ball protrudes. greater than the maximum outer diameter formed by the swirl vanes on the centralizer body;

The hydraulic device includes a liquid cylinder and a piston, the piston is arranged inside the liquid cylinder, a hydraulic chamber is formed between the liquid cylinder, the piston and the central pipe, and the central pipe corresponding to the hydraulic chamber is provided with a connecting hydraulic pressure. The pressure transmission hole inside the cavity and the central tube;

The hydraulic diameter-reducing and centralizing device includes a mobile seat, a centralizing strip, and a fixed seat. The left and right ends of the centralizing strip are respectively fixed on the floating seat and the fixed seat by fixing nails. The maximum outer diameter of the centralizing device when the diameter is not reduced is smaller than the maximum outer diameter formed by the ball on the centralizing body, and the maximum outer diameter of the hydraulic pressure-reducing centralizing device after the diameter is reduced is larger than that of the ball on the centralizing body The right end of the fixed seat is connected to the conical ring platform, and the end with the smaller outer diameter of the conical ring platform is away from the fixed seat.

Preferably, the balls are arranged at the left and right ends of the same side of the swirl vane.

Preferably, a plurality of the swirl vanes are arranged and evenly distributed on the centralizer body, and the roller rotating centralizer can freely rotate around the central tube.

Preferably, the helical direction of the swirl vanes is right-handed.

Preferably, a plurality of identical inclined grooves are provided on the outer surface of the central tube between the right end of the piston and the left end of the fixed seat, and a first inclined tooth is formed between two adjacent grooves. The top of the ring is inclined to the right, and the inner surface of the backstop ring is provided with two inclined teeth matched with the groove.

Preferably, the left end of the fixed seat is provided with a limit seat.

Preferably, the righting bar is made of spring steel.

Preferably, the righting bar is made of 60Si2Mn spring steel.

Preferably, an outer thread 1 and an outer thread 2 are respectively provided on the left end and the lower joint of the central tube, the outer diameter of the left end of the outer thread 1 is smaller than the outer diameter of the right end of the outer thread 1, and the outer thread of the outer thread 2 is smaller than the outer diameter of the right end of the outer thread 1. The outer diameter of the left end is larger than the outer diameter of the right end of the second external thread.

Compared with the prior art, the present invention has the following advantages:

The invention has reasonable structural design, good righting effect and strong comprehensive effect, and has broad application prospects in improving the cementing quality and strengthening the sealing performance of the segmented packer.

On the one hand, on the basis of the traditional casing roller centralizer, balls are introduced, and then the rolling of the balls during the running of the casing reduces the running-in friction of the casing, and at the same time, because the outer diameter is larger than the casing, the composite Other components and casings of swirl hydraulic centralizers.

On the other hand, by setting up the hydraulic variable diameter and centralizing device, it can assist in removing the remaining cuttings and dead slurry at the well wall and improve the cementing quality. Specifically, after the hydraulic variable diameter centralizing device is in place in the entire completion tool, under the action of the pressure in the wellbore, the centralizing strip is hydraulically driven to expand to fill the supporting well wall, so that the casing is centered in the wellbore, forming a uniform At the same time, the roller swirl centralizing device leaves the well wall and is suspended in the wellbore because the maximum outer diameter is smaller than the maximum outer diameter of the hydraulic variable diameter centralizing part. The liquid flow state can help to remove the residual cuttings and dead slurry at the well wall, and improve the cementing quality.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

Fig. 1 is the structural representation of the composite swirl hydraulic centralizer of the present invention;

Figure 2 is a schematic structural diagram of the hydraulic variable diameter centralizing device of Figure 1 after expansion;

Fig. 3 is the structure schematic diagram of the roller rotary centralizer of the composite swirl hydraulic centralizer of the present invention;

Fig. 4 is the structural schematic diagram of the hydraulic variable diameter centralizing device of the composite swirl hydraulic centralizer of the present invention;

FIG. 5 is a schematic structural diagram of the backstop ring of the composite swirl hydraulic centralizer of the present invention.

1-coupling, 2-center tube, 201-inclined tooth 1, 3-roller rotating centralizer, 301-ball hole, 302-ball, 303-swirl vane, 4-centering sleeve, 5-liquid cylinder, 6-transmission Press hole, 7-piston, 8-backstop, 801-inclined tooth 2, 9-hydraulic variable diameter centralizing device, 901-moving seat, 902-fixing nail, 903-centering strip, 904-fixing seat, 10- Limit seat, 11-conical ring stage, 12-lower joint.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments in the present application and the technical features in the embodiments may be combined with each other under the condition of no conflict.

It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the present invention, unless otherwise stated, the terms "first", "second", etc. are used to distinguish similar objects, rather than to describe a specific order or sequence. The terminology so used should be understood; the terms "upper," "lower," "left," "right," etc. are used generally with respect to the orientation shown in the drawings, or with respect to the component itself in vertical, vertical, or In terms of the direction of gravity; similarly, for the convenience of understanding and description, "inner", "outer", etc. refer to the inner and outer relative to the contour of each component itself. However, the above-mentioned orientation words are not used to limit the present invention.

As shown in Figures 1-5, the present invention provides a composite swirl hydraulic centralizer, including a coupling 1, a central tube 2, a roller rotary centralizing device 3, a centralizing sleeve 4, a hydraulic device, a backstop ring 8, a hydraulic variable Diameter centralizing device 9 , conical ring stage 11 , lower joint 12 .

The right end of the coupling 1 is connected to the left end of the central tube 2, and the roller rotating centering device 3, the centering sleeve 4, the hydraulic device, the stop ring 8, the hydraulic variable diameter centering device 9, and the conical ring platform 11 are in sequence. The adjacent sleeve is arranged on the central pipe 2 , and the right end of the central pipe 2 is connected with the left end of the lower joint 12 .

The roller rotation centering device 3 includes a centering body, and the centering body is provided with a ball hole 301 and a swirl blade 303. The ball hole 301 is provided with a ball 302 matching the ball hole 301. The ball 302 It is arranged on the left and right ends of the same side of the swirl vane 303, and the maximum outer diameter formed by the protruding ball 302 is larger than the maximum outer diameter formed by the swirl vane 303 on the centering body. A plurality of 303 are arranged and evenly distributed on the centralizer body, the spiral direction of the swirl vanes 303 is right-handed, and the roller rotating centralizer can freely rotate around the central tube 2 .

The hydraulic device includes a hydraulic cylinder 5 and a piston 7. The piston 7 is arranged inside the hydraulic cylinder 5. A hydraulic chamber is formed between the hydraulic cylinder 5, the piston 7 and the central pipe 2. The hydraulic chamber corresponds to the The central pipe 2 is provided with a pressure transmission hole 6 which communicates the hydraulic chamber and the interior of the central pipe 2 .

The hydraulic variable diameter centralizing device 9 includes a moving seat 901, a centralizing bar 903, and a fixed seat 904. The centralizing bar 903 is made of any spring steel selected from 60Si2Mn, 55Si2Mn, 60Si2CrA, 55CrMnA, and the like. The left and right ends of the bar 903 are respectively fixed on the movable seat 901 and the fixed seat 904 by the fixing nails 902 , and the maximum outer diameter of the hydraulic pressure reducing and centralizing device 9 when the diameter is not reduced is smaller than that where the ball 302 is located. The maximum outer diameter formed on the centralizing body, the maximum outer diameter after the hydraulic diameter reducing centralizing device 9 is reduced is greater than the maximum outer diameter formed by the ball 302 on the centralizing body, and the right end of the fixing seat 904 The conical annulus 11 is connected to each other, and the end of the conical annulus 11 with a smaller outer diameter is away from the fixing seat 904 .

In a specific embodiment, the outer surface of the central tube 2 between the right end of the piston 7 and the left end of the fixing seat 904 is provided with a plurality of identical inclined grooves, and an inclined groove is formed between two adjacent grooves. Tooth one 201, the top of the inclined tooth one 201 is inclined to the right, the inner surface of the backstop ring 8 is provided with inclined tooth two 801 matched with the groove, and the inclined tooth one 201 and the inclined tooth two 801 The backstop ring 8 can be moved to the right in one direction in cooperation with the backstop function.

In a specific embodiment, in order to prevent the fixing base 904 from moving to the left, optionally, a limit seat 10 is provided at the left end of the fixing base 904 .

In a specific embodiment, the left end of the central pipe 2 and the lower joint 12 are respectively provided with an outer thread 1 and an outer thread 2, the outer diameter of the left end of the outer thread 1 is smaller than the outer diameter of the right end of the outer thread 1 , the outer diameter of the left end of the second outer thread is larger than the outer diameter of the right end of the second outer thread. In this way, the screw connection with other components can be facilitated and the operation efficiency can be improved.

In a specific embodiment, in order to prevent the fixing base 904 from moving to the left, optionally, a limit seat 10 is provided at the left end of the fixing base 904 .

The working principle of the present invention is as follows:

In cementing or completion operations, casing and related completion tools are run according to design requirements. When running the completion string, connect a set of composite cyclone hydraulic centralizers every certain length or number of casings or completion tools according to the pre-designed quantity. In the process of casing, it is equivalent to the conventional rigid centralizer of the casing roller, and the outer diameter is the same as that of the conventional rigid centralizer. part.

After the tool string is assembled in place, it is pressed inside the pipe string, the liquid enters the liquid cylinder 5 through the pressure transmission hole 6, the piston 7 moves to the right under the pressure drive, and the piston 7 moves down to push the movable seat 901, which is fixed on the movable seat 901 The upper righting strips 903 expand and flex along the moving direction. After the outer diameters of the multiple righting strips 903 are expanded in place, the casing and the completion tool are supported in the center. After the device 9 is depressurized, there will be no backward slippage.

After the casing and the completion tool are supported and centered by the hydraulic variable diameter centralizing device, the swirl vanes 303 completely leave the well wall and can rotate freely on the central pipe. During the operation of circulating fluid in the well, the swirl vane 303 is driven to rotate by the flow of the liquid, and the fluid passing through the swirl vane 303 generates swirl, changes the flow field, and effectively washes the virtual mud cake on the well wall, thereby improving the replacement of cement slurry. efficiency and improve cementing quality.

In the process of lowering the tool, the roller action of the roller rotating centralizing device reduces the friction resistance of the completion tool string going down the well, and the stable and reliable hydraulic variable diameter centralizing device realizes the full well diameter under the action of hydraulic pressure after the completion tool string is in place. Support to maximize the centering of casing and completion tools in the wellbore. At the same time, in the process of cementing and circulating cleaning, the swirl vane that is separated from the well wall is separated from the well wall, and rotates and disturbs the flow state of the annular fluid under the action of the fluid, which can improve the cementing quality and clean up the dead slurry during the cementing process. , the role of debris. Therefore, the present invention has the characteristics of reasonable structure, good righting effect and strong comprehensive effect, has broad application prospects in drilling and completion operations, and has significant progress compared with the prior art.

The above are only preferred embodiments of the present invention, and do not limit the present invention in any form. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Technical personnel, within the scope of the technical solution of the present invention, can make some changes or modifications to equivalent examples of equivalent changes by using the technical content disclosed above, but any content that does not depart from the technical solution of the present invention, according to the present invention. The technical essence of the invention Any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the technical solutions of the present invention.

Claims (9)

1. a composite swirl hydraulic centralizer, is characterized in that, comprises coupling, central pipe, roller rotating centralizer, centralizer, hydraulic device, backstop ring, hydraulic variable diameter centralizer, conical ring platform, lower connector, The right end of the coupling is connected with the left end of the central tube, and the roller rotating centralizing device, the centralizing sleeve, the hydraulic device, the backstop ring, the hydraulic variable diameter centralizing device, and the conical ring platform are successively sleeved in the center adjacently. On the pipe, the right end of the central pipe is connected with the left end of the lower joint; The roller rotation centering device includes a centering body, a ball hole and a swirl blade are arranged on the centering body, a ball matching the ball hole is arranged in the ball hole, and the maximum outer diameter formed by the ball protrudes. greater than the maximum outer diameter formed by the swirl vanes on the centralizer body; The hydraulic device includes a liquid cylinder and a piston, the piston is arranged inside the liquid cylinder, a hydraulic chamber is formed between the liquid cylinder, the piston and the central pipe, and the central pipe corresponding to the hydraulic chamber is provided with a connecting hydraulic pressure. The pressure transmission hole inside the cavity and the central tube; The hydraulic diameter-reducing and centralizing device includes a mobile seat, a centralizing strip, and a fixed seat. The left and right ends of the centralizing strip are respectively fixed on the floating seat and the fixed seat by fixing nails. The maximum outer diameter of the centralizing device when the diameter is not reduced is smaller than the maximum outer diameter formed by the ball on the centralizing body, and the maximum outer diameter of the hydraulic pressure-reducing centralizing device after the diameter is reduced is larger than that of the ball on the centralizing body The right end of the fixed seat is connected to the conical ring platform, and the end with the smaller outer diameter of the conical ring platform is away from the fixed seat. 2 . The composite swirl hydraulic centralizer according to claim 1 , wherein the balls are arranged on the left and right ends of the same side of the swirl vane. 3 . 3 . The composite swirl hydraulic centralizer according to claim 1 , wherein the swirl vanes are provided with a plurality of and evenly distributed on the centralizer body, and the roller rotating centralizer can rotate around the center. 4 . Tube rotates freely. 4 . The composite swirl hydraulic centralizer according to claim 3 , wherein the helical direction of the swirl vanes is right-handed. 5 . 5 . The composite swirl hydraulic centralizer according to claim 1 , wherein a plurality of identical inclined grooves are arranged on the outer surface of the central pipe between the right end of the piston and the left end of the fixing seat, 6 . A first inclined tooth is formed between two adjacent grooves, the top of the first inclined tooth is inclined to the right, and the inner surface of the backstop ring is provided with a second inclined tooth matched with the groove. 6 . The composite swirl hydraulic centralizer according to claim 1 , wherein the left end of the fixed seat is provided with a limit seat. 7 . 7 . The composite swirl hydraulic centralizer according to claim 1 , wherein the centralizer is made of spring steel. 8 . 8 . The composite swirl hydraulic centralizer according to claim 7 , wherein the centralizer is made of 60Si2Mn spring steel. 9 . 9. The composite swirl hydraulic centralizer according to any one of claims 1 to 8, wherein the left end and the lower joint of the central pipe are respectively provided with an outer thread 1 and an outer thread 2, and the The outer diameter of the left end of the first outer thread is smaller than the outer diameter of the right end of the first outer thread, and the outer diameter of the left end of the second outer thread is larger than the outer diameter of the right end of the second outer thread.

Images