Rigid sleeve stabilizer

Abstract

A rigid casing stabilizer relates to the technical field of low carbon exploitation of oil field. The lower end of the centralizing sleeve is upwardly provided with an annular counterbore, and a lifting sleeve is arranged in the annular counterbore. The lifting sleeve is connected with the annular counterbore through threads. The upper part of the lifting sleeve is connected with a compression spring A through a plane bearing. The upper part of the compression spring A is abutted against the bottom of the annular counterbore. The lower part of the lifting sleeve is provided with a balance cutting mechanism. The beneficial effects of the present application are as follows: the balance cutting mechanism is arranged at the lower part of the centralizing sleeve. When the lower casing encounters irregular well diameter, the main cutting block and the auxiliary cutting block encounter the inner convex of the well wall, the lifting sleeve starts to rotate and rise, the main cutting block and the auxiliary cutting block cut the well wall, so that the casing can be smoothly lowered into the wellbore. When cutting, no large bending force is formed on the casing, thereby protecting the casing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of low-carbon oilfield exploitation, and particularly relates to an energy-saving and environment-friendly rigid casing stabilizer. BACKGROUND

[0002] The rigid casing stabilizer is generally a righting strip with a strip-shaped structure, is widely applied to casing operation in a straight well or a high-deviation well, has the characteristics of small starting force and large resetting force, can effectively reduce the frictional resistance during casing lowering, and has the defects that when the well diameter is irregular, the casing is bent during casing lowering, and even the casing is damaged, which cannot guarantee the use demand, causes uncertain machining factors for construction, and cannot meet the use demand. SUMMARY

[0003] In order to solve the problem that the existing rigid casing stabilizer is not suitable for irregular well diameters, the present application provides a rigid casing stabilizer.

[0004] The technical scheme provided by the present application is as follows: a rigid casing stabilizer comprises a body, the body is divided into a central pipe and a righting sleeve, the righting sleeve is provided with uniformly distributed flow guide grooves on the outer circle, and the pipe wall of the central pipe is provided with rivet holes;

[0005] An annular counterbore is formed in the lower end face of the righting sleeve and faces upward, a lifting sleeve is arranged in the annular counterbore, the lifting sleeve is connected with the annular counterbore through threads, a compression spring A is connected to the upper part of the lifting sleeve through a plane bearing, the upper part of the compression spring A abuts against the bottom of the annular counterbore, and a balance cutting mechanism is arranged at the lower part of the lifting sleeve;

[0006] The balance cutting mechanism comprises three main cutting sleeves and three auxiliary cutting blocks, each main cutting sleeve comprises a main cutting block and a driving ring, an inwardly extending outer inclined surface is formed on the main cutting block along the central symmetrical part, an auxiliary cutting block is arranged outside the outer inclined surface, an inner inclined surface is formed on the inner side of the auxiliary cutting block, the angle of the inner inclined surface is the same as that of the outer inclined surface, the driving ring is a non-closed annular structure, and a gap exists in the clockwise part of the auxiliary cutting block.

[0007] Three arc-shaped long holes penetrating the upper and lower parts are formed in the driving ring, the three arc-shaped long holes are uniformly distributed in the circumferential direction, and a radial long hole penetrating the upper and lower parts is formed in the auxiliary cutting block.

[0008] The main cutting sleeve and the auxiliary cutting block are arranged in three layers, one main cutting sleeve and one auxiliary cutting block form a layer, the inner inclined surface of the auxiliary cutting block is attached to the outer inclined surface of the main cutting sleeve, the main cutting sleeve and the auxiliary cutting block are circumferentially distributed, one positioning shaft A is arranged in the arc-shaped long hole of the three main cutting sleeves, the positioning shaft A is fixedly connected with the lifting sleeve, the positioning shaft A is attached to the side of the arc-shaped long hole in the clockwise direction, a compression spring C is arranged between the positioning shaft A and the other side of the arc-shaped long hole, positioning shaft B, positioning shaft C and positioning shaft D are arranged in the radial long holes of the three auxiliary cutting blocks, the positioning shaft B, the positioning shaft C and the positioning shaft D are fixedly connected with the lifting sleeve, the positioning shaft B, the positioning shaft C and the positioning shaft D are attached to the outer side of the radial long hole, and the compression spring B is arranged between the positioning shaft B, the positioning shaft C, the positioning shaft D and the inner side of the radial long hole.

[0009] The limiting sleeve is arranged below the main cutting sleeve and the auxiliary cutting block at the lowermost side of the central pipe.

[0010] The outer diameter of the main cutting sleeve and the auxiliary cutting block is the same as the outer diameter of the centralizing sleeve.

[0011] The graphite sleeve is arranged between the lifting sleeve and the central pipe, the lower end of the graphite sleeve is limited by the stepped hole of the lifting sleeve, the upper end of the graphite sleeve is provided with a pressing ring, the pressing ring is limited on the upper part of the graphite sleeve, and the pressing ring is connected to the upper part of the lifting sleeve through bolts.

[0012] The connecting thread between the lifting sleeve and the annular counterbore is a non-self-locking thread.

[0013] The main cutting block is provided with a front inclined surface and a rear inclined surface in the counterclockwise direction, the front inclined surface and the rear inclined surface form a cutting edge, and the cutting structure of the auxiliary cutting block is the same as that of the main cutting block.

[0014] The present application has the following advantages: when the lower sleeve encounters irregular well diameter, the main cutting block and the auxiliary cutting block encounter the inner convexity of the well wall, the lifting sleeve is pressed and rotates upward under the action of the thread, the main cutting block and the auxiliary cutting block cut the well wall, so that the sleeve can be smoothly lowered into the wellbore, and the sleeve can be lifted once the inner convexity cannot be completely cut, the lifting sleeve is spirally lowered under the action of the compression spring A, and the sleeve is lowered again for cutting until it passes through smoothly.

[0015] When the well wall on one side is blocked, the main cutting sleeve rotates clockwise by an angle during cutting, the driving ring rotates, the outer inclined surface drives the auxiliary cutting block to move outward, is attached to the other side of the well wall, and the stress during cutting of the main cutting block is transmitted to the other side of the well wall through the auxiliary cutting block, so that the sleeve is not subjected to large bending force during cutting, thereby protecting the sleeve. BRIEF DESCRIPTION OF DRAWINGS

[0016] ATTACHMENT Figure 1is the structural schematic diagram of the present application;

[0017] attached Figure 2 is the attached Figure 1 A-A sectional view of the present application;

[0018] attached Figure 3 is the attached Figure 1 B enlarged view of the present application;

[0019] attached Figure 4 is the attached Figure 1 C enlarged view of the present application;

[0020] attached Figure 5 is the attached Figure 2 working diagram of the present application;

[0021] attached Figure 6 Structural schematic diagram of the balancing cutting mechanism in the present application;

[0022] attached Figure 7 is the structural schematic diagram of the main cutting sleeve in the present application;

[0023] attached Figure 8 is the structural schematic diagram of the auxiliary cutting block in the present application;

[0024] attached Figure 9 is the structural schematic diagram of the appearance of the body in the present application.

[0025] Figure 1 - body, 101 - centralizing sleeve, 102 - central tube, 103 - annular counterbore, 104 - flow guide groove, 2 - lifting sleeve, 3 - main cutting sleeve, 301 - main cutting block, 3011 - rear inclined surface, 3012 - front inclined surface, 3013 - cutting edge, 302 - driving ring, 303 - arc-shaped long hole, 304 - outer inclined surface, 4 - auxiliary cutting block, 401 - inner inclined surface, 402 - radial long hole, 5 - limiting sleeve, 6 - compression spring A, 7 - pin, 8 - rivet hole, 9 - positioning shaft A, 10 - positioning shaft B, 11 - positioning shaft C, 12 - positioning shaft D, 13 - compression spring B, 14 - compression spring C, 15 - flat bearing, 16 - graphite sleeve, 17 - compression ring. DETAILED DESCRIPTION

[0026] As Figures 1-9 shown, a rigid casing stabilizer includes a body 1, the body 1 is divided into two parts of a central tube 102 and a centralizing sleeve 101, the centralizing sleeve 101 is uniformly distributed with flow guide grooves 104, the pipe wall of the central tube 102 is provided with a rivet hole 8 for connecting the casing;

[0027] The lower end of the righting sleeve 101 is upwardly provided with an annular recess 103, and the annular recess 103 is provided with a lifting sleeve 2, which is connected with the annular recess 103 through threads, and the upper part of the lifting sleeve 2 is connected with a compression spring A6 through a plane bearing 15, the upper part of the compression spring A6 is abutted against the bottom of the annular recess 103, and the lower part of the lifting sleeve 2 is provided with a balance cutting mechanism;

[0028] The balance cutting mechanism comprises three main cutting sleeves 3 and three auxiliary cutting blocks 4, the main cutting sleeve 3 comprises a main cutting block 301 and a driving ring 302, the driving ring 302 is provided with an inwardly extending outer inclined surface 304 at the central symmetrical part of the main cutting block 301, the outer side of the outer inclined surface 304 is provided with the auxiliary cutting block 4, the inner side of the auxiliary cutting block 4 is provided with an inner inclined surface 401, the angle of the inner inclined surface 401 is same as that of the outer inclined surface 304, the driving ring 302 is a non-closed annular structure, and a gap exists in the clockwise part of the driving ring 302 relative to the auxiliary cutting block 4;

[0029] The driving ring 302 is provided with three arc-shaped long holes 303 penetrating upward and downward, the three arc-shaped long holes 303 are circumferentially distributed, and the auxiliary cutting block 4 is provided with a radial long hole 402 penetrating upward and downward;

[0030] The main cutting sleeve 3 and the auxiliary cutting block 4 are arranged in three layers, one main cutting sleeve 3 and one auxiliary cutting block 4 form one layer, the inner inclined surface 401 of the auxiliary cutting block 4 is abutted against the outer inclined surface 304 of the main cutting sleeve 3, the main cutting sleeve 3 and the auxiliary cutting block 4 are circumferentially distributed, one positioning shaft A9 is arranged in each of the arc-shaped long holes 303 of the three main cutting sleeves 3, the positioning shaft A9 is fixedly connected with the lifting sleeve 2, the positioning shaft A9 is abutted against one side of the arc-shaped long hole 303 in the clockwise direction, a compression spring C14 is arranged between the other side of the arc-shaped long hole 303 and the positioning shaft A9, and positioning shaft B10, positioning shaft C11 and positioning shaft D12 are respectively arranged in the radial long holes 402 of the three auxiliary cutting blocks 4, the positioning shaft B10, the positioning shaft C11 and the positioning shaft D12 are fixedly connected with the lifting sleeve 2, the positioning shaft B10, the positioning shaft C11 and the positioning shaft D12 are abutted against the outer side of the radial long hole 402, and the compression spring B13 is arranged between the inner side of the radial long hole 402 and the positioning shaft B10, the positioning shaft C11 and the positioning shaft D12.

[0031] When the lower sleeve pipe encounters irregular well diameters, the main cutting block 301 and the auxiliary cutting block 4 are pressed against the well wall, the lifting sleeve 2 is rotated and lifted under the action of the threads, the main cutting block 301 and the auxiliary cutting block 4 cut the well wall, the sleeve pipe can be smoothly lowered into the wellbore, the inner convexity cannot be completely cut in one lifting, the sleeve pipe can be lifted, the lifting sleeve 2 is spirally lowered under the action of the compression spring A6, the sleeve pipe is lowered again for cutting until the sleeve pipe is smoothly passed through;

[0032] When the well wall on one side is blocked, as shown in the accompanying drawings, Figure 5As shown, the main cutting sleeve 3 rotates an angle in the clockwise direction during cutting, and the outer inclined surface 304 drives the auxiliary cutting block 4 to move outward and stick to the other side of the well wall after the driving ring 302 rotates. The force of the main cutting block 301 is transmitted to the other side of the well wall through the auxiliary cutting block 4, so that no large bending force is formed on the casing during cutting, thereby protecting the casing. When the cutting is completed without resistance, the main cutting sleeve 3 returns to the original position under the action of the compression spring C14, and the auxiliary cutting block 4 returns to the original position under the action of the compression spring B13.

[0033] The center tube 102 is provided with a limiting sleeve 5 below the main cutting sleeve 3 and the auxiliary cutting block 4 at the lowermost side, and the limiting sleeve 5 and the center tube 102 are fixedly connected through a pin 7.

[0034] The outer diameter of the main cutting sleeve 3 and the auxiliary cutting block 4 is the same as the outer diameter of the centralizing sleeve 101.

[0035] The lifting sleeve 2 is provided with a graphite sleeve 16 between the center tube 102, the lower end of the graphite sleeve 16 is limited by the stepped hole of the lifting sleeve 2, the upper end of the graphite sleeve is provided with a compression ring 17, the compression ring 17 is limited on the upper part of the graphite sleeve 16, the compression ring 17 is connected to the upper part of the lifting sleeve 2 through bolts, and the graphite sleeve 16 plays a lubricating role between the lifting sleeve 2 and the center tube 102.

[0036] The connecting thread between the lifting sleeve 2 and the annular counterbore 103 is a non-self-locking thread, and the lifting sleeve 2 can be positively or negatively rotated to ascend or descend.

[0037] The main cutting block 301 is provided with a front inclined surface 3012 and a rear inclined surface 3011 in the counterclockwise direction, and the cutting edge 3013 is formed between the front inclined surface 3012 and the rear inclined surface 3011, and the cutting structure of the auxiliary cutting block 4 is the same as that of the main cutting block 301.

Claims

1. A rigid cannula stabilizer comprising a body (1), characterized in that: The body (1) is divided into two parts of a central pipe (102) and a centralizing sleeve (101), the outer circle of the centralizing sleeve (101) is processed with uniformly distributed flow guide grooves (104), and the pipe wall of the central pipe (102) is opened with rivet holes (8); The lower end face of the centralizing sleeve (101) is opened with an annular counterbore (103) upward, the annular counterbore (103) is provided with a lifting sleeve (2), the lifting sleeve (2) is connected with the annular counterbore (103) through screw threads, the upper part of the lifting sleeve (2) is connected with a compression spring A (6) through a plane bearing (15), the upper part of the compression spring A (6) is abutted on the bottom of the annular counterbore (103), and the lower part of the lifting sleeve (2) is provided with a balance cutting mechanism; The balance cutting mechanism comprises three main cutting sleeves (3) and three auxiliary cutting blocks (4), the main cutting sleeve (3) comprises a main cutting block (301) and a driving ring (302), the driving ring (302) is processed with an inwardly extending outer inclined surface (304) at the central symmetrical part of the main cutting block (301), the outer side of the outer inclined surface (304) is provided with the auxiliary cutting block (4), the inner side of the auxiliary cutting block (4) is processed with an inner inclined surface (401), the angle of the inner inclined surface (401) is same as that of the outer inclined surface (304), the driving ring (302) is a non-closed annular structure, and a gap exists in the clockwise part of the driving ring (302) in the auxiliary cutting block (4); The driving ring (302) is opened with three upper and lower through arc long holes (303), the three arc long holes (303) are circumferentially uniformly distributed, and the auxiliary cutting block (4) is opened with an upper and lower through radial long hole (402); The main cutting sleeve (3) and the auxiliary cutting block (4) are arranged in three layers, one main cutting sleeve (3) and one auxiliary cutting block (4) form one layer, the inner inclined surface (401) of the auxiliary cutting block (4) is abutted on the outer inclined surface (304) of the main cutting sleeve (3), the main cutting sleeve (3) and the auxiliary cutting block (4) are circumferentially uniformly distributed, one positioning shaft A (9) is arranged in each of the arc long holes (303) of the three main cutting sleeves (3), the positioning shaft A (9) is fixedly connected with the lifting sleeve (2), the positioning shaft A (9) is abutted on the one side of the arc long hole (303) in the clockwise direction, the compression spring C (14) is arranged between the positioning shaft A (9) and the other side of the arc long hole (303), the positioning shaft B (10), the positioning shaft C (11) and the positioning shaft D (12) are respectively arranged in the radial long holes (402) of the three auxiliary cutting blocks (4) upward and downward, the positioning shaft B (10), the positioning shaft C (11) and the positioning shaft D (12) are fixedly connected with the lifting sleeve (2), the positioning shaft B (10), the positioning shaft C (11) and the positioning shaft D (12) are abutted on the outer side of the radial long hole (402), and the compression spring B (13) is arranged between the positioning shaft B (10), the positioning shaft C (11) and the positioning shaft D (12) and the inner side of the radial long hole (402).

2. A rigid sleeve stabilizer according to claim 1, characterized in that: The lower part of the main cutting sleeve (3) and the auxiliary cutting block (4) of the central pipe (102) is provided with a limiting sleeve (5), and the limiting sleeve (5) and the central pipe (102) are fixedly connected through a pin (7).

3. A rigid sleeve stabilizer according to claim 1, wherein: The outer diameter of the main cutting sleeve (3) and the auxiliary cutting block (4) is the same as the outer diameter of the centralizing sleeve (101).

4. A rigid sleeve stabilizer according to claim 1, wherein: The lifting sleeve (2) and the central pipe (102) are provided with a graphite sleeve (16), the lower end of the graphite sleeve (16) is limited by the stepped hole of the lifting sleeve (2), the upper end of the graphite sleeve (16) is provided with a pressing ring (17), the pressing ring (17) is limited on the upper part of the graphite sleeve (16), and the pressing ring (17) is connected to the upper part of the lifting sleeve (2) through bolts.

5. A rigid sleeve stabilizer according to claim 1, wherein: The connecting thread between the lifting sleeve (2) and the annular counterbore (103) is a non-self-locking thread.

6. A rigid sleeve stabilizer according to claim 1, wherein: The main cutting block (301) is provided with a front inclined surface (3012) and a rear inclined surface (3011) in the counterclockwise direction, and the cutting edge (3013) is formed between the front inclined surface (3012) and the rear inclined surface (3011), and the cutting structure of the auxiliary cutting block (4) is the same as that of the main cutting block (301).

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