An elastomeric sleeve stabilizer

Abstract

An elastic sleeve stabilizer relates to the technical field of oil and gas well drilling and completion. The upper sleeve is fixedly connected with elastic sheets at the lower part, and the elastic sheets are fixedly connected with the lower sleeve at the lower part. The upper sleeve and the lower sleeve are sleeved on the sleeve, the elastic sheets are uniformly arranged along the circumference of the sleeve, and cutting assemblies are arranged on the elastic sheets. The elastic sheets are contracted and deformed by the resistance of the sleeve when encountering a block, the gear is driven to rotate by the approaching of the rack A and the rack B, the winding wheel A is driven to rotate by the rotation of the gear, the winding wheel B and the cutting head are driven to rotate by the steel wire rope, the irregular section in the wellbore is cut by the cutting head, the sleeve can be smoothly lowered, the cutting can be repeatedly performed when not passing, and the downward pushing force of the sleeve can be increased when still not passing, so that the elastic sheet is pulled to reduce the outer diameter, and the irregular section in the wellbore is passed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas well drilling and completion, and particularly relates to an elastic casing stabilizer. BACKGROUND

[0002] The elastic casing stabilizer is a tool used in the process of oil and gas well drilling and completion, and is mainly used to ensure the central position of the casing in the wellbore, which is of great significance for improving cementing quality, preventing casing eccentricity and optimizing fluid flow.

[0003] The elastic sheet of the common elastic casing stabilizer is usually made of high-elastic metal elastic sheet or similar elastic material, which can adapt to a certain range of wellbore changes, and at the same time maintain good elasticity in the downhole, form a support between the casing outer diameter and the well wall, and provide stable centralizing effect. However, when the elastic sheet encounters an irregular diameter wellbore, the elastic sheet will directly be pressed hard with the well wall, causing the elastic sheet to deform or even be damaged, which will cause the frictional resistance between the elastic sheet and the well wall to be large, increase the difficulty of pipe running, and possibly cause casing sticking or slow pipe running speed, increase operation time and cost. SUMMARY

[0004] In order to solve the problem that the existing elastic casing stabilizer is not suitable for irregular wellbores, the present application provides an elastic casing stabilizer.

[0005] The technical scheme provided by the present application is as follows: an elastic casing stabilizer, comprising an upper sleeve and a lower sleeve, the lower part of the upper sleeve is fixedly connected with an elastic sheet, the lower part of the elastic sheet is fixedly connected with the lower sleeve, the upper sleeve and the lower sleeve are sleeved on the casing, threaded holes are processed on the pipe wall of the upper sleeve and the lower sleeve, and a tight screw is installed in the threaded hole for fixing the casing, the elastic sheet is uniformly arranged along the circumference of the casing, and a cutting assembly is arranged on the elastic sheet.

[0006] The elastic sheet is composed of the following parts: a lower straight section connected with the lower sleeve, a transition section A extending outward above the lower straight section, a support section parallel to the casing above the transition section A, a transition section B extending toward the casing above the support section, an upper straight section connected with the upper sleeve above the transition section B, a U-shaped bend recessed inward in the middle of the support section, a vertical section A parallel to the diameter direction of the casing on the transition section A, and a U-shaped bend composed of two vertical sections B on both sides and a semicircular section at the lower part.

[0007] The cutting assembly comprises a cutting head, a conical tip structure with a cutting edge at the lower part of the cutting head, a stepped shaft C at the upper part of the cutting head, a stepped shaft B at the upper part of the stepped shaft C, a stepped shaft A at the upper part of the stepped shaft B, the outer diameters of the stepped shaft C, the stepped shaft B and the stepped shaft A decreasing in turn, a through hole B passing through the upper and lower parts of the vertical section A, the stepped shaft B passing through the through hole B, the end surface of the stepped shaft C being seated on the lower end surface of the vertical section A, a torsion spring being sleeved on the stepped shaft C, the lower part of the torsion spring being fixed on the stepped shaft C, the upper part of the torsion spring being fixed on the vertical section A, a winding wheel B being connected on the stepped shaft A through a flat key, the winding wheel B being axially limited by a shaft check ring and the stepped shaft A;

[0008] Two vertical sections B are respectively fixedly connected with a rack A and a rack B, the rack A and the rack B being arranged in parallel along the sleeve axis, a gear being arranged between the rack A and the rack B, the gear being rotatably connected with the rack A and the rack B in meshing, the gear being provided with a winding wheel A at the upper part, a steel wire rope being fixedly connected on the winding wheel A, a through hole C passing through the upper and lower parts of the lower vertical section B, the steel wire rope passing through the through hole C, being wound around a fixed pulley and then being fixedly connected on the winding wheel B, the steel wire rope being wound several turns on the winding wheel B, the fixed pulley being fixed on an elastic sheet;

[0009] When the two vertical sections B are close to each other, the gear and the winding wheel A rotate, the winding wheel A winds the steel wire rope upward to pull, drives the winding wheel B and the cutting head to rotate, and the torsion spring is tightened.

[0010] The upper sleeve is fixedly connected with the elastic sheet at the lower part, threaded holes are formed in the tube walls of the upper sleeve and the lower sleeve, and tight screws are arranged in the threaded holes to fix the sleeve, or the lower sleeve is in sliding fit with the sleeve, a stepped hole is formed at the lower part of the upper sleeve, the upper sleeve is provided with six through holes A at the stepped hole part, the through holes A are in interference fit with pin shafts, the pin shafts extend into the stepped hole to rotatably connect a lever, a through hole D is formed in the upper vertical section of the elastic sheet, one end of the lever is rotatably connected with the elastic sheet through a hinge shaft and the through hole D, the other end of the lever is provided with a counter thrust sheet, the counter thrust sheet is fixedly connected with the lower sleeve at the lower part, and the upper end of the counter thrust sheet abuts against the lower part of the lever.

[0011] The outer diameter of the winding wheel A is greater than the outer diameters of the gear and the winding wheel B.

[0012] The gear is made of magnetic steel, and the rack A and the rack B are made of carbon steel.

[0013] The wall thickness of the semicircular section is less than that of other sections of the elastic sheet, and the thicknesses of the other sections of the elastic sheet are consistent.

[0014] A strip-shaped groove is formed at the upper end of the inner hole of the lower sleeve, the elastic sheet is inserted into the strip-shaped groove, and the inner side of the elastic sheet is flush with the inner hole of the lower sleeve.

[0015] The beneficial effects of this invention are as follows: This invention utilizes the resistance of the casing when it encounters a blockage as a driving force. The semi-circular section of the elastic sheet contracts and deforms, driving the gear to rotate by the approach of racks A and B. The rotation of the gear drives the winding wheel A to rotate, which in turn drives the winding wheel B and the cutting head to rotate through the wire rope. The cutting head cuts off the irregular section inside the wellbore, allowing the casing to be smoothly lowered. If it fails to pass, the cutting can be repeated. If it still fails to pass, the downward pushing force of the casing can be increased, causing the outer diameter of the elastic sheet to shrink under tension, thus allowing it to pass through the irregular section of the wellbore. Attached Figure Description

[0016] Appendix Figure 1 This is a perspective view of the present invention;

[0017] Appendix Figure 2 This is a cross-sectional view of the present invention;

[0018] Appendix Figure 3 This is a perspective view of the cutting component in this invention;

[0019] Appendix Figure 4 It is attached Figure 3 Enlarged view of point A;

[0020] Appendix Figure 5 It is attached Figure 3 The partial view from direction B;

[0021] Appendix Figure 6 A schematic diagram of the structure of the elastic sheet in this invention;

[0022] Appendix Figure 7 This is a schematic diagram of the upper sleeve structure in this invention;

[0023] Appendix Figure 8 This is a schematic diagram of the lower sleeve in this invention.

[0024] In the diagram: 1-Upper sleeve, 101-Stepped hole, 102-Threaded hole, 103-Through hole A, 2-Lower sleeve, 201-Strip groove, 3-Elastic plate, 301-Lower straight section, 302-Transition section A, 303-Vertical section A, 304-Through hole B, 305-Support section, 306-Through hole C, 307-U-shaped bend, 3071-Vertical section B, 3072-Semi-circular section, 308-Transition section B, 309-Upper straight section, 3010-Through hole D, 4-Reverse thrust plate, 5-Set screw. 6-Pin, 7-Lever, 8-Cutting assembly, 9-Cutting head, 901-Stepped shaft A, 902-Stepped shaft B, 903-Stepped shaft C, 10-Torsion spring, 11-Fixed pulley, 12-Wire rope, 13-Rope winding wheel A, 14-Rack A, 15-Rack B, 16-Gear, 17-Rope winding wheel B, 18-Flat key, 19-Hinge shaft, 20-Shaft retaining ring. Detailed Implementation

[0025] likeFigures 1-8 As shown in the figure, an elastic sleeve stabilizer comprises an upper sleeve 1 and a lower sleeve 2, the lower part of the upper sleeve 1 is fixedly connected with an elastic sheet 3, the lower part of the elastic sheet 3 is fixedly connected with the lower sleeve 2, the upper sleeve 1 and the lower sleeve 2 are sleeved on the sleeve, threaded holes 102 are processed on the pipe wall of the upper sleeve 1 and the lower sleeve 2, and a set screw 5 is installed in the threaded hole 102 for fixing the sleeve, the elastic sheet 3 is uniformly arranged along the circumference of the sleeve, and a cutting assembly 8 is arranged on the elastic sheet 3;

[0026] The elastic sheet 3 is composed of the following parts: a lower straight section 301 connected with the lower sleeve 2, a transition section A 302 extending outward above the lower straight section 301, a support section 305 parallel to the sleeve above the transition section A 302, a transition section B 308 extending toward the sleeve above the support section 305, an upper straight section 309 connected with the upper sleeve 1 above the transition section B 308, a U-shaped bend 307 recessed inward in the middle of the support section 305, a vertical straight section A 303 parallel to the diameter direction of the sleeve on the transition section A 302, and the U-shaped bend 307 composed of two vertical straight sections B 3071 on the sides and a semicircular section 3072 at the lower part;

[0027] The cutting assembly 8 comprises a cutting head 9, the lower part of the cutting head 9 is a conical tip structure with a cutting edge, a stepped shaft C 903 is arranged on the upper part of the cutting head 9, a stepped shaft B 902 is arranged on the upper part of the stepped shaft C 903, a stepped shaft A 901 is arranged on the upper part of the stepped shaft B 902, the outer diameters of the stepped shaft C 903, the stepped shaft B 902 and the stepped shaft A 901 decrease in turn, a through hole B 304 is formed in the vertical straight section A 303, the stepped shaft B 902 passes through the through hole B 304, the end surface of the stepped shaft C 903 is seated on the lower end surface of the vertical straight section A 303, a torsion spring 10 is sleeved on the stepped shaft C 903, the lower part of the torsion spring 10 is fixed on the stepped shaft C 903, the upper part of the torsion spring 10 is fixed on the vertical straight section A 303, a winding wheel B 17 is connected with the stepped shaft A 901 through a flat key 18, and the winding wheel B 17 is axially limited with the stepped shaft A 901 through an axial stop washer 20;

[0028] Two vertical straight sections B 3071 are fixedly connected with a rack A 14 and a rack B 15 respectively, the rack A 14 and the rack B 15 are arranged in parallel along the sleeve axis, a gear 16 is arranged between the rack A 14 and the rack B 15, the gear 16 is rotatably connected with the rack A 14 and the rack B 15 in meshing, a winding wheel A 13 is arranged on the upper part of the gear 16, a steel wire rope 12 is fixedly connected with the winding wheel A 13, a through hole C 306 is formed in the lower vertical straight section B 3071, the steel wire rope 12 passes through the through hole C 306, is fixedly connected with the winding wheel B 17 after winding around a fixed pulley 11, and is wound several turns on the winding wheel B 17, and the fixed pulley 11 is fixed on the elastic sheet 3;

[0029] When the two vertical segments B3071 are close, the gear 16 and the winding wheel A13 rotate, the winding wheel A13 winds the steel wire rope 12 upward, drives the winding wheel B17 and the cutting head 9 to rotate, and the torsion spring 10 is tightened.

[0030] The upper sleeve 1 is fixedly connected with the elastic sheet 3 at the lower part, threaded holes 102 are formed on the pipe walls of the upper sleeve 1 and the lower sleeve 2, and the threaded holes 102 are provided with the fixing screws 5 for fixing the sleeve pipe.

[0031] The outer diameter of the winding wheel A13 is greater than the outer diameters of the gear 16 and the winding wheel B17, the gear 16 drives the winding wheel A13 to rotate, the winding wheel A13 can wind the steel wire rope 12 for a longer length when rotating, and can drive the winding wheel B17 to rotate for more turns and at a greater speed.

[0032] The gear 16 is made of magnetic steel, the racks A14 and B15 are made of carbon steel, and the magnetism of the gear 16 is used for axial fixation.

[0033] The wall thickness of the semicircular segment 3072 is less than that of the other segments of the elastic sheet 3, and the thicknesses of the other segments of the elastic sheet 3 are consistent, so that the semicircular segment 3072 is deformed first when being extruded by external force.

[0034] A strip-shaped groove 201 is formed on the upper end of the inner hole of the lower sleeve 2, the elastic sheet 3 is inserted into the strip-shaped groove 201, and the inner side of the elastic sheet 3 is flush with the inner hole of the lower sleeve 2.

[0035] The elastic sleeve stabilizer is installed on the sleeve pipe, when the sleeve pipe is lowered into the wellbore and encounters irregular blockage in the wellbore, the transition segment A302 is extruded, the semicircular segment 3072 is first deformed by extrusion, the vertical segments B3071 are close, the gear 16 and the winding wheel A13 rotate, the winding wheel A13 winds the steel wire rope 12 upward, drives the winding wheel B17 and the cutting head 9 to rotate, the cutting head 9 cuts the irregular segment in the wellbore, and the sleeve pipe can be smoothly lowered, if it cannot pass through once, the sleeve pipe is lifted, at this time, the cutting head 9 is reversed under the action of the torsion spring 10, the steel wire rope 12 is rewound on the winding wheel B17, the semicircular segment 3072 also returns to the original state, and the sleeve pipe is lowered again to cut the irregular segment.

[0036] When the above measures still cannot pass, the casing is pushed down with greater force, the elastic sheet 3 pushes up the lever 7, the lever 7 rotates, the other end of the lever 7 presses down the reverse pushing sheet 4, so that the lower sleeve 2 is lowered, the support section 305 of the elastic sheet 3 is reduced in outer diameter, and the irregular section of the wellbore is passed.

[0037] The present application utilizes the resistance of the casing when encountering a block as power, the semicircular section 3072 of the elastic sheet 3 is contracted and deformed, the rack A14 and the rack B15 are driven to rotate the gear 16 by moving close to each other, the gear 16 drives the winding wheel A13 to rotate by rotating, the winding wheel B17 and the cutting head 9 are driven to rotate by the steel wire rope 12, the irregular section in the wellbore is cut by the cutting head 9, the casing can be smoothly lowered, the cutting can be repeatedly performed when not passing, and the casing can be pushed down with greater force when still not passing, so that the elastic sheet 3 is reduced in outer diameter under tension and passes through the irregular section of the wellbore.

Claims

1. A flexible sleeve stabilizer, comprising an upper sleeve (1) and a lower sleeve (2), characterized in that: The upper sleeve (1) is fixedly connected to the lower part of the elastic plate (3), and the lower sleeve (2) is fixedly connected to the lower part of the elastic plate (3). The upper sleeve (1) and the lower sleeve (2) are fitted on the sleeve. The upper sleeve (1) and the lower sleeve (2) are both machined with threaded holes (102) on the pipe wall. Set screws (5) are installed in the threaded holes (102) to fix the sleeve. The elastic plates (3) are evenly arranged along the circumference of the sleeve. The elastic plates (3) are provided with cutting components (8). The elastic sheet (3) consists of the following parts Composition: The lower straight section (301) is connected to the lower sleeve (2) at the bottom. Above the lower straight section (301) is a transition section A (302) extending outward. Above the transition section A (302) is a support section (305) parallel to the sleeve. Above the support section (305) is a transition section B (308) extending towards the sleeve. Above the transition section B (308) is an upper straight section (309) connected to the upper sleeve (1). The support section (305) has an inwardly concave U-shaped bend (307) in the middle. The transition section A (302) has a vertical section A (303) parallel to the diameter direction of the sleeve. The U-shaped bend (307) is composed of vertical sections B (3071) on both sides and a semi-circular section (3072) at the bottom. The cutting assembly (8) includes a cutting head (9). The lower part of the cutting head (9) is a conical tip structure with a cutting edge. The upper part of the cutting head (9) is provided with a stepped shaft C (903), the upper part of the stepped shaft C (903) is provided with a stepped shaft B (902), the upper part of the stepped shaft B (902) is provided with a stepped shaft A (901), the outer diameters of the stepped shaft C (903), the stepped shaft B (902) and the stepped shaft A (901) decrease sequentially. The vertical section A (303) has a through hole B (304) that runs vertically through the vertical section. 02) Passing through the through hole B (304), the end face of the stepped shaft C (903) sits on the lower end face of the vertical section A (303). A torsion spring (10) is sleeved on the stepped shaft C (903). The lower part of the torsion spring (10) is fixed on the stepped shaft C (903), and the upper part of the torsion spring (10) is fixed on the vertical section A (303). The winding wheel B (17) is connected to the stepped shaft A (901) by a flat key (18). The winding wheel B (17) is axially limited to the stepped shaft A (901) by a shaft retaining ring (20). Two vertical sections B (3071) are respectively fixedly connected to racks A (14) and B (15). Racks A (14) and B (15) are arranged parallel to the sleeve axis. A gear (16) is provided between racks A (14) and B (15). The gear (16) meshes with racks A (14) and B (15) and rotates. A rope wheel A (13) is provided on the upper part of the gear (16). A wire rope (12) is fixedly connected to the rope wheel A (13). A through hole C (306) is opened on the lower vertical section B (3071). The wire rope (12) passes through the through hole C (306), passes around the fixed pulley (11), and is fixedly connected to the rope wheel B (17). The wire rope (12) is wound several times on the rope wheel B (17). The fixed pulley (11) is fixed on the elastic plate (3). When the two vertical sections B (3071) approach each other, the gear (16) and the winding wheel A (13) rotate. The winding wheel A (13) winds the wire rope (12) upward, driving the winding wheel B (17) and the cutting head (9) to rotate, and the torsion spring (10) tightens.

2. The elastic sleeve stabilizer according to claim 1, characterized in that: The lower part of the upper sleeve (1) is fixedly connected to the elastic plate (3). Threaded holes (102) are machined on the pipe walls of both the upper sleeve (1) and the lower sleeve (2). Set screws (5) are installed in the threaded holes (102) to fix the sleeve. Alternatively, the lower sleeve (2) can slide with the sleeve. The lower part of the upper sleeve (1) is machined with a stepped hole (101). The upper sleeve (1) has a through hole A (103) at the stepped hole (101). The number of through holes A (103) is six evenly distributed around the circumference. 103) An interference fit connecting pin (6) is inserted into the stepped hole (101) to rotate and connect the lever (7). The upper straight section (309) of the elastic plate (3) has a through hole D (3010). One end of the lever (7) is rotatably connected to the elastic plate (3) through the hinge shaft (19) and the through hole D (3010). The other end of the lever (7) is provided with a push plate (4). The lower part of the push plate (4) is fixedly connected to the lower sleeve (2), and the upper end of the push plate (4) is pressed against the lower part of the lever (7).

3. The elastic sleeve stabilizer according to claim 1, characterized in that: The outer diameter of the rope-winding wheel A (13) is larger than the outer diameter of the gear (16) and the rope-winding wheel B (17).

4. The elastic sleeve stabilizer according to claim 1, characterized in that: The gear (16) is made of magnetic steel, and the racks A (14) and B (15) are made of carbon steel.

5. The elastic sleeve stabilizer according to claim 1, characterized in that: The wall thickness of the semicircular segment (3072) is less than that of the other segments of the elastic sheet (3), while the thickness of the other segments of the elastic sheet (3) is the same.

6. The elastic sleeve stabilizer according to claim 1, characterized in that: The upper end of the inner hole of the lower sleeve (2) has a strip groove (201), and the elastic piece (3) is inserted into the strip groove (201). The inner side of the elastic piece (3) is flush with the inner hole of the lower sleeve (2).

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