A composite cyclone hydraulic centralizer

Abstract

The present invention discloses a composite cyclone hydraulic straightener, comprising a coupling, a center tube, a roller rotary straightener, a straightening sleeve, a hydraulic device, a back-off ring, a hydraulic variable diameter straightener, a conical ring platform, and a lower joint. The right end of the coupling is connected to the left end of the center tube. The roller rotary straightener, the straightening sleeve, the hydraulic device, the back-off ring, the hydraulic variable diameter straightener, and the conical ring platform are sequentially and adjacently sleeved on the center tube. The right end of the center tube is connected to the left end of the lower joint. The roller rotary straightener comprises a ball hole, a cyclone blade, and a ball. The hydraulic device comprises a cylinder, a piston, and a pressure transmission hole. The hydraulic variable diameter straightener comprises a floating seat, a straightening bar, and a fixed seat. The present invention can not only effectively solve the problems of high entry resistance and poor applicability of the existing straightener to irregular wellbore diameters, but also assist in removing residual rock cuttings and dead slurry from the well wall during drilling and cementing operations.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas drilling and completion, in particular to a composite cyclone hydraulic centralizer for fixing and centralizing a casing. Background Art

[0002] In the process of drilling completion, especially in the completion of directional wells, horizontal wells, and extended reach wells, the casing centralizer is a necessary supporting device. The centralizer centers the casing in the wellbore, which not only reduces the friction during the casing lowering process, but also ensures a uniform annular gap between the casing and the wellbore wall. In cementing operations, uniform annular gap is an important parameter to ensure cementing quality; and in staged fracturing operations, uniform annular gap promotes uniform sealing of the staged packers in the wellbore to prevent crosstalk between fracturing fluid segments. The existing rigid casing centralizer has a large outer diameter and a fixed diameter, which has a large resistance when lowered into the wellbore and is not suitable for places with expanded wellbore diameters. However, the existing spring centralizer has the problem of limited expansion outer diameter and insufficient support force.

[0003] In addition, during normal drilling mud circulation and cementing operations, due to the uneven shape of the well wall, there are residual cuttings and dead slurry in the horizontal well section, and the limited mud displacement and flow range cannot completely carry away the retained cuttings and dead slurry, which will cause poor cementing and open hole packer isolation quality, affecting the subsequent oil and gas production. The existing centralizer has a single function and cannot help clean up the dead slurry and cuttings in the wellbore. Summary of the invention

[0004] 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 existing centralizers, but also assist in removing residual rock cuttings and dead slurry from the well wall during drilling and cementing operations.

[0005] The technical solution of the present invention is as follows:

[0006] A composite cyclone hydraulic centralizer, comprising a coupling, a center pipe, a roller rotary centralizer, a centralizer sleeve, a hydraulic device, a stop ring, a hydraulic variable diameter centralizer, a conical ring platform, and a lower joint.

[0007] The right end of the coupling is connected to the left end of the center pipe, the roller rotary straightening device, the straightening sleeve, the hydraulic device, the stop ring, the hydraulic variable straightening device, and the conical ring are sequentially and adjacently sleeved on the center pipe, and the right end of the center pipe is connected to the left end of the lower joint;

[0008] The roller rotating straightening device comprises a straightening body, the straightening body is provided with a ball hole and a swirl blade, the ball hole is provided with a ball matching the ball hole, and the maximum outer diameter formed by the protrusion of the ball is greater than the maximum outer diameter formed by the swirl blade on the straightening body;

[0009] The hydraulic device comprises a cylinder and a piston, wherein the piston is arranged inside the cylinder, a hydraulic cavity is formed between the cylinder, the piston and the central tube, and a pressure transmission hole connecting the hydraulic cavity and the inside of the central tube is provided on the central tube corresponding to the hydraulic cavity;

[0010] The hydraulic variable diameter straightening device includes a movable seat, a straightening bar, and a fixed seat. The left and right ends of the straightening bar are respectively fixed to the movable seat and the fixed seat by fixing nails. The maximum outer diameter of the hydraulic variable diameter straightening device before the diameter is changed is smaller than the maximum outer diameter formed by the ball on the straightening body. The maximum outer diameter of the hydraulic variable diameter straightening device after the diameter is changed is larger than the maximum outer diameter formed by the ball on the straightening body. The right end of the fixed seat is connected to the conical ring stage, and the end with the smaller outer diameter of the conical ring stage is far away from the fixed seat.

[0011] Preferably, the balls are arranged at left and right ends of the same side of the swirl blade.

[0012] Preferably, the swirl blades are provided in plurality and are evenly distributed on the straightening body, and the roller rotary straightening device can rotate freely around the central tube.

[0013] Preferably, the spiral direction of the swirl blade is right-handed.

[0014] Preferably, the outer surface of the center tube between the right end of the piston and the left end of the fixed seat is provided with a plurality of identical inclined grooves, an inclined tooth 1 is formed between two adjacent grooves, the top of the inclined tooth 1 is inclined to the right, and the inner surface of the stop ring is provided with an inclined tooth 2 matching the groove.

[0015] Preferably, a limiting seat is provided at the left end of the fixing seat.

[0016] Preferably, the straightening bar is made of spring steel.

[0017] Preferably, the straightening bar is made of 60Si2Mn spring steel.

[0018] Preferably, the left end of the center tube and the lower joint are respectively provided with external thread one and external thread two, the outer diameter of the left end of the external thread one is smaller than the outer diameter of the right end of the external thread one, and the outer diameter of the left end of the external thread two is larger than the outer diameter of the right end of the external thread two.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] The invention has reasonable structural design, good righting effect and powerful comprehensive effect, and has broad application prospects in improving cementing quality and strengthening sealing performance of segmented packers.

[0021] On the one hand, by introducing balls on the basis of traditional casing roller centralizers, the friction resistance of casing lowering is reduced by the rolling of balls during the casing lowering process. At the same time, since the outer diameter is larger than the casing, other components and casing of the composite cyclone hydraulic centralizer can be protected.

[0022] On the other hand, by setting up a hydraulic variable diameter straightening device, it is possible to assist in removing the residual rock cuttings and dead slurry on the well wall and improve the cementing quality. Specifically, after the hydraulic variable diameter straightening device is in place with the entire completion tool, under the action of the pressure in the wellbore, the straightening bar is hydraulically driven to expand and fully support the well wall, so that the casing is centered in the wellbore and a uniform annular gap is formed; at the same time, the roller swirl straightening device is suspended in the wellbore because its maximum outer diameter is smaller than the maximum outer diameter of the hydraulic variable diameter straightening part, and the straightening body rotates under the action of hydraulic pressure, and the swirl blades rotate to disturb the liquid flow state of the annulus, assisting in removing the residual rock cuttings and dead slurry on the well wall and improving the cementing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 It is a structural schematic diagram of the composite cyclone hydraulic centralizer of the present invention;

[0025] Figure 2 for Figure 1 Schematic diagram of the structure of the hydraulic variable diameter straightening device after expansion;

[0026] Figure 3 It is a structural schematic diagram of the roller rotary straightening device of the composite cyclone hydraulic straightening device of the present invention;

[0027] Figure 4 It is a structural schematic diagram of a hydraulic variable diameter straightening device of a composite cyclone hydraulic straightening device of the present invention;

[0028] Figure 5 It is a structural schematic diagram of the back-off ring of the composite cyclone hydraulic centralizer of the present invention.

[0029] 1-coupling, 2-center tube, 201-tilted tooth one, 3-roller rotation straightening device, 301-ball hole, 302-ball, 303-swirl blade, 4 straightening sleeve, 5-hydraulic cylinder, 6-pressure transmission hole, 7-piston, 8-stop ring, 801-tilted tooth two, 9-hydraulic variable diameter straightening device, 901-swimming seat, 902-fixing nail, 903-straightening strip, 904-fixed seat, 10-limiting seat, 11-conical ring table, 12-lower joint. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments and technical features in the embodiments of the present application can be combined with each other without conflict.

[0031] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0032] 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. It should be understood that the terms used in this way; the terms "upper", "lower", "left", "right", etc. are usually used in relation to the directions shown in the drawings, or in relation to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "inner", "outer", etc. refer to the inside and outside relative to the outline of each component itself. However, the above-mentioned directional words are not used to limit the present invention.

[0033] like Figure 1-5 As shown, the present invention provides a composite cyclone hydraulic straightener, including a coupling 1, a center pipe 2, a roller rotary straightening device 3, a straightening sleeve 4, a hydraulic device, a stop ring 8, a hydraulic variable diameter straightening device 9, a conical ring platform 11, and a lower joint 12.

[0034] The right end of the coupling 1 is connected to the left end of the center pipe 2, and the roller rotary straightening device 3, the straightening sleeve 4, the hydraulic device, the stop ring 8, the hydraulic variable diameter straightening device 9, and the conical ring platform 11 are sequentially and adjacently arranged on the center pipe 2, and the right end of the center pipe 2 is connected to the left end of the lower joint 12.

[0035] The roller rotating straightening device 3 includes a straightening body, which 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 is arranged at the left and right ends of the same side of the swirl blade 303. The maximum outer diameter formed by the protrusion of the ball 302 is greater than the maximum outer diameter formed by the swirl blade 303 on the straightening body. A plurality of swirl blades 303 are arranged and evenly distributed on the straightening body. The spiral direction of the swirl blade 303 is right-handed. The roller rotating straightening device can rotate freely around the center tube 2.

[0036] The hydraulic device includes a cylinder 5 and a piston 7. The piston 7 is arranged inside the cylinder 5. A hydraulic cavity is formed between the cylinder 5, the piston 7, and the center tube 2. The center tube 2 corresponding to the hydraulic cavity is provided with a pressure transmission hole 6 connecting the hydraulic cavity and the inside of the center tube 2.

[0037] The hydraulic variable diameter straightening device 9 includes a movable seat 901, a straightening bar 903, and a fixed seat 904. The straightening bar 903 is made of any one of spring steels such as 60Si2Mn, 55Si2Mn, 60Si2CrA, 55CrMnA, etc. The left and right ends of the straightening bar 903 are respectively fixed to the movable seat 901 and the fixed seat 904 by fixing nails 902. The maximum outer diameter of the hydraulic variable diameter straightening device 9 when it is not changed is smaller than the maximum outer diameter formed by the ball 302 on the straightening body. The maximum outer diameter of the hydraulic variable diameter straightening device 9 after the change is greater than the maximum outer diameter formed by the ball 302 on the straightening body. The right end of the fixed seat 904 is connected to the conical ring stage 11, and the end of the conical ring stage 11 with a smaller outer diameter is away from the fixed seat 904.

[0038] In a specific embodiment, a plurality of identical inclined grooves are provided on the outer surface of the center tube 2 between the right end of the piston 7 and the left end of the fixed seat 904, and an inclined tooth 201 is formed between two adjacent grooves. The top of the inclined tooth 1 201 is inclined to the right, and the inner surface of the stop ring 8 is provided with an inclined tooth 2 801 matching the groove. The cooperation between the inclined tooth 1 201 and the inclined tooth 2 801 enables the stop ring 8 to move unidirectionally to the right, thereby realizing the stop function.

[0039] In a specific embodiment, in order to prevent the fixing seat 904 from moving to the left, optionally, a limiting seat 10 is provided at the left end of the fixing seat 904 .

[0040] In a specific embodiment, the left end of the central tube 2 and the lower joint 12 are provided with external thread 1 and external thread 2, respectively, the outer diameter of the left end of the external thread 1 is smaller than the outer diameter of the right end of the external thread 1, and the outer diameter of the left end of the external thread 2 is larger than the outer diameter of the right end of the external thread 2. In this way, it is convenient to connect with other components by thread, and the operation efficiency is improved.

[0041] In a specific embodiment, in order to prevent the fixing seat 904 from moving to the left, optionally, a limiting seat 10 is provided at the left end of the fixing seat 904 .

[0042] The working principle of the present invention is as follows:

[0043] In cementing or completion operations, casing and related completion tools are lowered according to design requirements. When the completion string is lowered, a set of composite cyclone hydraulic centralizers is connected every certain length or number of casing or completion tools according to the pre-designed number. When the tool string is lowered into the well, the roller rotary centralizer 3 is equivalent to a conventional casing roller rigid centralizer during the casing lowering process. The outer diameter size is consistent with the size of the conventional rigid centralizer. The function is to reduce the friction resistance of the casing lowering process and protect other components of the hydraulic variable diameter centralizer.

[0044] After the tool string assembly is in place, pressure is applied inside the tubing column, and liquid enters the hydraulic cylinder 5 through the pressure transmission hole 6. The piston 7 moves to the right under the pressure, and the piston 7 moves downward to push the swimming seat 901. The straightening bars 903 fixed on the swimming seat 901 expand and bend along the direction of movement. After the outer diameters of the plurality of straightening bars 903 are expanded and in place, the casing and the completion tool are supported in the center. The stop ring 8 can prevent the swimming seat 901 from sliding backward after the hydraulic variable diameter straightening device 9 is depressurized.

[0045] After the casing and completion tool are supported and centered by the hydraulic variable diameter straightening device, the swirl blade 303 completely leaves the well wall and can rotate freely on the center pipe. When the fluid circulates in the well, the swirl blade 303 is driven to rotate by the flow of the liquid, and the fluid passing through the swirl blade 303 generates a swirl flow, changes the flow field, and effectively flushes the virtual mud cake on the well wall, thereby improving the cement slurry displacement efficiency and the cementing quality.

[0046] The present invention reduces the friction resistance of the completion tool string in the well through the roller action of the roller rotating straightening device during the process of lowering the tool. After the completion tool string is in place, the stable and reliable hydraulic variable diameter straightening device realizes full wellbore support under the action of hydraulic pressure, and centers the casing and the completion tool in the wellbore to the greatest extent. At the same time, the swirl blades that are separated from the well wall during the cementing and circulation cleaning process are separated from the well wall, and rotate and disturb the flow state of the annular fluid under the action of the fluid, which has the effect of improving the cementing quality and cleaning dead slurry and cuttings during the cementing process. Therefore, the present invention has the characteristics of reasonable structure, good straightening effect, and strong comprehensive effect. It has broad application prospects in drilling and completion operations and has significant progress compared with the existing technology.

[0047] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A composite cyclone hydraulic centralizer, characterized in that: It includes coupling, center pipe, roller rotating straightening device, straightening sleeve, hydraulic device, stop ring, hydraulic reducer straightening device, conical ring platform, lower joint, The right end of the coupling is connected to the left end of the center pipe, the roller rotary straightening device, the straightening sleeve, the hydraulic device, the stop ring, the hydraulic variable straightening device, and the conical ring are sequentially and adjacently sleeved on the center pipe, and the right end of the center pipe is connected to the left end of the lower joint; The roller rotating straightening device comprises a straightening body, the straightening body is provided with a ball hole and a swirl blade, the ball hole is provided with a ball matching the ball hole, and the maximum outer diameter formed by the protrusion of the ball is greater than the maximum outer diameter formed by the swirl blade on the straightening body; The hydraulic device comprises a cylinder and a piston, wherein the piston is arranged inside the cylinder, a hydraulic cavity is formed between the cylinder, the piston and the central tube, and a pressure transmission hole connecting the hydraulic cavity and the inside of the central tube is provided on the central tube corresponding to the hydraulic cavity; The hydraulic variable diameter straightening device includes a movable seat, a straightening bar, and a fixed seat. The left and right ends of the straightening bar are respectively fixed to the movable seat and the fixed seat by fixing nails. The maximum outer diameter of the hydraulic variable diameter straightening device before the diameter is changed is smaller than the maximum outer diameter formed by the ball on the straightening body. The maximum outer diameter of the hydraulic variable diameter straightening device after the diameter is changed is larger than the maximum outer diameter formed by the ball on the straightening body. The right end of the fixed seat is connected to the conical ring stage, and the end with the smaller outer diameter of the conical ring stage is far away from the fixed seat.

2. The compound cyclone hydraulic centralizer according to claim 1, characterized in that: The balls are arranged at the left and right ends of the same side of the swirl blade.

3. The compound cyclone hydraulic centralizer according to claim 1, characterized in that: The swirl blades are arranged in plurality and are evenly distributed on the straightening body, and the roller rotating straightening device can rotate freely around the central tube.

4. The compound cyclone hydraulic centralizer according to claim 3, characterized in that: The spiral direction of the swirl blade is right-handed.

5. The compound cyclone hydraulic centralizer according to claim 1, characterized in that: The outer surface of the central tube between the right end of the piston and the left end of the fixed seat is provided with a plurality of identical inclined grooves, and an inclined tooth 1 is formed between two adjacent grooves, the top of the inclined tooth 1 is inclined to the right, and the inner surface of the stop ring is provided with an inclined tooth 2 matching the groove.

6. The compound cyclone hydraulic centralizer according to claim 1, characterized in that: A limiting seat is arranged at the left end of the fixing seat.

7. The compound cyclone hydraulic centralizer according to claim 1, characterized in that: The straightening bar is made of spring steel.

8. The compound cyclone hydraulic centralizer according to claim 7, characterized in that: The straightening bar is made of 60Si2Mn spring steel.

9. The compound cyclone hydraulic centralizer according to any one of claims 1 to 8, characterized in that: The left end of the center tube and the lower joint are respectively provided with external thread 1 and external thread 2, the outer diameter of the left end of the external thread 1 is smaller than the outer diameter of the right end of the external thread 1, and the outer diameter of the left end of the external thread 2 is larger than the outer diameter of the right end of the external thread 2.

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