Built-in slip drilling liner hanger suitable for small-gap horizontal well

Abstract

The built-in slip drilling liner hanger comprises a lifting connector, a coupling, a releasing shear pin, a positioning sliding sleeve, an inner tube and a hanging body, external threads and internal threads are arranged at the lower end of the lifting connector, and the lower end of the lifting connector is connected with the coupling through the external threads and connected with the inner tube through the internal threads; the lower end of the coupling is connected with an upper clamp spring sleeve, a positioning sliding sleeve is sleeved in the coupling and is connected with the coupling through a releasing shear pin, and the outer side of the coupling is connected with a suspension body; the lower end of the suspension body is connected with a nipple; the lower end of the inner pipe is connected with a fixing nut, the inner pipe is sleeved with a hydraulic cylinder, the lower end of the hydraulic cylinder is sequentially connected with a piston and a centralizing sleeve, the piston is sleeved with a slip sliding sleeve, and the lower end of the slip sliding sleeve is connected with a lower clamp spring sleeve. The suspension body is provided with the built-in slip, the slip is located in the groove of the suspension body, the slip cannot be collided by a tubular column in the descending process, and the problem that the small annulus of the horizontal well is difficult to descend is effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the solid completion technology field, concretely relates to a built-in slip liner hanger suitable for small clearance horizontal well. BACKGROUND

[0002] In the solid completion technology field of the oil and gas exploitation field, using the liner hanger to carry out the liner cementing operation can effectively reduce the drilling rig load and construction pressure, improve the time efficiency and reduce the cost. The hydraulic liner hanger is pushed down by the pressure to realize the hanging of the hanger slip, at present, the commonly used hydraulic liner hanger is difficult to be lowered into the casing of the small annular clearance horizontal well, and the situation of sticking is easily caused. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at providing a built-in slip liner hanger suitable for small clearance horizontal well to solve the problem that the small annular clearance cannot lower the hanger in the prior art.

[0004] The utility model aims at realizing the following technical scheme, a built-in slip liner hanger suitable for small clearance horizontal well, including lifting connector, coupling, release shear pin, positioning sliding sleeve, inner tube and hanger body, the lower end of lifting connector is provided with external thread and internal thread, the lower end of lifting connector is connected with coupling through external thread, and is connected with inner tube through internal thread;

[0005] The lower end of coupling is connected with upper clamp spring sleeve, the positioning sliding sleeve is sleeved in the coupling, and is connected with the coupling through release shear pin, and the outer side of coupling is connected with hanger body;

[0006] The hanger body is provided with slip groove, and the slip groove is connected with slip;

[0007] The lower end of hanger body is connected with short section;

[0008] The lower end of inner tube is connected with fixed nut, the outer side of inner tube is sleeved with hydraulic cylinder, and the lower end of hydraulic cylinder is sequentially connected with piston and centralizing sleeve, the outer side of piston is further sleeved with slip sliding sleeve, and the lower end of slip sliding sleeve is connected with lower clamp spring sleeve.

[0009] The outer side of the pipe body of coupling and the inner side of hanger body are all provided with stop block groove, and the two stop block grooves are inserted with stop block, and the stop block fixes coupling and hanger body.

[0010] The upper clamp spring sleeve and the lower clamp spring sleeve are all provided with clamp spring groove, the upper clamp spring sleeve is provided with upper clamp spring in the clamp spring groove, and the lower clamp spring sleeve is provided with lower clamp spring in the clamp spring groove.

[0011] The slip is further connected with positioning pin, and the positioning pin is connected with hanger body.

[0012] The pipe body of inner tube is provided with pressure transmission hole.

[0013] The piston and the centralizing sleeve are sleeved outside the inner tube.

[0014] The positioning shear pin is connected to the piston and fixed with the inner tube through the positioning shear pin.

[0015] The slip sleeve and the slip are both provided with a slip positioning groove, and a slip positioning block is arranged in the slip positioning groove to connect and fix the slip sleeve and the slip.

[0016] The lower end surface of the coupling and the upper end surface of the suspension body are both provided with torque grooves matched with each other.

[0017] The slip is further connected with a positioning pin.

[0018] The utility model discloses the beneficial effect lies in: the suspension body sets up the built -in slip, and the slip is located in the recess of the suspension body, and the slip will not be impacted by the pipe column in the process of lowering, effectively solve the problem of horizontal well small annular downhole difficulty,

[0019] The hydraulic device, i.e. hydraulic cylinder, piston and other hydraulic components, are all designed on the hanging tool, can be repeatedly used for many times, and the use cost is reduced. DETAILED DESCRIPTION

[0020] Figure 1 It is the product structure schematic diagram of the utility model.

[0021] Figure 2 It is the slip structure diagram.

[0022] Figure 3 It is the slip sectional view.

[0023] Figure 4 It is the slip plan view.

[0024] Figure 5 It is the suspension body structure diagram.

[0025] Figure 6 It is Figure 5 the A-A section view.

[0026] Figure 7 It is Figure 5 the B-B section view.

[0027] Figure 8 It is the coupling structure diagram.

[0028] Figure 9 It is Figure 8 the A-A section view.

[0029] Figure 10 It is the release shear pin installation structure diagram.

[0030] Figure 11 is an enlarged view of the upper snap spring peripheral structure;

[0031] Figure 12 is an enlarged view of the lower snap spring 19 peripheral structure;

[0032] Fig. 1 is a lifting joint, 2 is a coupling, 3 is a release shear pin, 4 is a positioning sliding sleeve, 5 is a stop block, 6 is an upper snap spring sleeve, 7 is an upper snap spring, 8 is an inner tube, 9 is a hydraulic cylinder, 10 is a suspension body, 11 is a positioning pin, 12 is a sitting shear pin, 13 is a positioning shear pin, 14 is a slip positioning block, 15 is a slip, 16 is a slip sliding sleeve, 17 is a piston, 18 is a lower snap spring sleeve, 19 is a lower snap spring, 20 is a centralizing sleeve, 21 is a fixing nut, 22 is a short section, 23 is a stop block groove, 24 is a torque groove, 25 is a slip positioning groove, 26 is a slip groove, 27 is a toothed groove, 28 is a sealing ring, 29 is a piston tube outer circular groove, and 30 is a pressure transmission hole.

[0033] The utility model will be further explained in detail below in combination with the drawings and examples. Specific implementation

[0034] As shown in Figure 1 , a built-in slip liner hanger suitable for small-gap horizontal wells comprises a lifting joint 1, a coupling 2, a release shear pin 3, a positioning sliding sleeve 4, an inner tube 8, and a suspension body 10. The lower end of the lifting joint 1 is provided with external threads and internal threads. The lower end of the lifting joint 1 is connected to the coupling 2 through the external threads and connected to the inner tube 8 through the internal threads.

[0035] The lifting joint 1 is connected to the drilling tool through the drill rod buckle taper threads at the upper end and connected to the coupling 2 through the external threads at the lower end and connected to the inner tube 8 through the internal threads. The coupling 2 is also sleeved on the outer side of the inner tube 8.

[0036] As shown in Figures 8 to 9 , the lower end of the coupling 2 is connected to the upper snap spring sleeve 6. The positioning sliding sleeve 4 is sleeved in the coupling 2 and connected to the coupling 2 through the release shear pin 3. The outer side of the coupling 2 is connected to the suspension body 10. The coupling 2 and the suspension body 10 are connected through the toothed groove 27.

[0037] As shown in Figure 10 , the positioning sliding sleeve 4 is fixed in position with the coupling 2 through the release shear pin 3. The inner hole of the coupling 2 is provided with a sealing ring 28 for sealing above and below the release shear pin 3. That is, a sealing ring groove is opened on the outer wall of the positioning sliding sleeve 4 and the inner wall of the coupling 2 above and below the release shear pin 3, respectively. The sealing ring 28 is arranged in the sealing ring groove to ensure the sealing of the release shear pin 3 in the middle. The fixing mode is that a hole is opened in the pipe body of the coupling 2 and a groove is opened on the positioning sliding sleeve 4. The release shear pin 3 passes through the hole on the pipe body of the coupling 2 and is inserted into the corresponding groove of the positioning sliding sleeve 4 for fixation.

[0038] The sealing ring 28 is arranged between the lifting joint 1 and the inner tube 8, between the inner tube 8 and the liquid cylinder 9, and between the inner tube 8 and the fixing nut 21, so as to ensure the sealing of the inner tube.

[0039] As shown in Figures 2 to 7 , the hanger body 10 is provided with the slip groove 26, and the slip 15 is connected in the slip groove 26; the hanger body 10 is provided with the slip groove 26, the slip 15 is fixed in the slip groove 26 of the hanger body 10, the positioning pin 11 is arranged on the slip 15 to fix the position of the hanger body 10; the lower end of the hanger body 10 is connected with the short joint 22 through the internal thread;

[0040] The hanger body 10 is connected with the short joint 22 at the lower end;

[0041] The inner tube 8 is connected with the fixing nut 21 at the lower end, the liquid cylinder 9 is sleeved outside the inner tube 8, the piston 17 and the centralizing sleeve 20 are sequentially connected at the lower end of the liquid cylinder 9, the slip sleeve 16 is further sleeved outside the piston 17, and the lower slip spring sleeve 18 is connected at the lower end of the slip sleeve 16.

[0042] The fixing nut 21 is used for fixing the liquid cylinder 9, the piston 17 and the centralizing sleeve 20 which are sleeved outside the inner tube 8, and is equivalent to a bottom plate, so that the upper liquid cylinder 9, the piston 17 and the centralizing sleeve 20 are lifted together.

[0043] The pipe body outside the coupling 2 and the inner side of the hanger body 10 are both provided with the block groove 23, the two block grooves 23 are inserted with the block 5, and the block 5 fixes the coupling 2 and the hanger body 10.

[0044] The two ends of the block 5 are respectively inserted into the two block grooves 23, so that the two block grooves 23 are clamped, and the coupling 2 and the hanger body 10 are fixed.

[0045] As shown in Figure 11 and Figure 12 , the upper spring sleeve 6 and the lower spring sleeve 18 are both provided with the spring groove, the upper spring 7 is arranged in the spring groove of the upper spring sleeve 6, and the lower spring 19 is arranged in the spring groove of the lower spring sleeve 16.

[0046] The upper spring sleeve 6 and the lower spring sleeve 18 are both provided with the spring groove, which is used for installing the upper spring 7 and the lower spring 19 and plays a role of fixing the position.

[0047] The function of the spring: after the positioning shear pin 13 is cut off, the upper spring 7 is locked in the outer groove at the upper end of the centralizing sleeve 20, the position is fixed, and at this time, the slip positioning block 14 falls into the outer circular groove 29 of the piston pipe body.

[0048] After the shear pin 3 is sheared off, the upper clamp spring 7 is locked in the outer groove at the upper end of the hydraulic cylinder 9, and the position is fixed. At this time, the stop block 5 falls into the stop block groove 23. The purpose is that when the tool is pulled out, the fixed stop block 5 can be smoothly pulled out with the tool.

[0049] The slip 15 is further connected with a positioning pin 11, and the positioning pin 11 is connected with the suspension body 10.

[0050] The inner tube 8 is provided with a pressure transmission hole 30. The pressure transmission hole 30 is directly drilled on the tube body 8.

[0051] The piston 17 and the centralizing sleeve 20 are both sleeved on the inner tube 8. The piston 17 and the centralizing sleeve 20 are both clamped between the inner tube 8 and the suspension body 10.

[0052] The positioning shear pin 13 and the hanging shear pin 12 are further included. The piston 17 is connected with the positioning shear pin 13 and is fixed with the inner tube 8 through the positioning shear pin 13. The piston 17 is fixed with the slip sleeve 16 through the hanging shear pin 12.

[0053] The slip sleeve 16 and the slip 15 are both provided with a slip positioning groove 25. The slip positioning block 14 is arranged in the slip positioning groove 25, so as to connect and fix the slip sleeve 16 and the slip 15.

[0054] The slip positioning block 14 is inserted into the slip positioning groove 25 of the slip sleeve 16 and the slip 15, so as to fix the slip sleeve 16 and the slip 15.

[0055] The lower end surface of the coupling 2 and the upper end surface of the suspension body 10 are both provided with a torque groove 24 which cooperates with each other.

[0056] The slip 15 is further connected with the positioning pin 11.

[0057] The positioning pin 11 is fixed on the lower clamp spring sleeve 18 after overall assembly.

[0058] The suspension body 10 is provided with a slip groove 26. The angle of the slip groove 26 is consistent with the angle of the two sides of the slip 15. The sawteeth outside the slip 15 are used for engaging the inner wall of the outer casing in the wellbore (the outer casing refers to the casing which has been lowered into the wellbore originally). The slip 15 is provided with a slip positioning groove 25 in the middle, which is used for positioning the slip positioning block 14 and pushing the slip 15 to be hung in the process of the slip positioning block 14 going up. The slip 15 is provided with the positioning pin 11, which is used for fixing the initial position of the slip 15. Figure 6 As shown in the figure, the two sides of the slip are 60 degrees.

[0059] The hanger is connected in the cementing pipe string. When the hanger is needed to be set, the pipe is pressurized, high-pressure liquid enters the cylinder 9 through the pressure transmission hole 30 on the inner pipe 8, when the pressure rises to the shearing pressure of the setting shear pin 12, the setting shear pin 12 between the piston 17 and the inner pipe 8 is sheared, the piston 17 and the cylinder 9 go up together, the piston 17 and the cylinder 9 drive the slips positioning block 14 in the slips sliding sleeve 16 to go up, the slips 15 go up under the action of the slips positioning block 14 and are wedged between the hanger body 10 and the outer casing. When the whole liner is set on the outer casing by being lowered.

[0060] After the hanger is set, the pressure is continuously kept, the positioning shear pin 12 between the slips sliding sleeve 16 and the piston 17 is sheared, the cylinder 9 and the piston 17 go up, the slips positioning block 14 in the slips sliding sleeve 16 falls into the groove (the groove on the outer circle of the piston 17 pipe body) of the piston 17, the slips sliding sleeve 16 is separated from the hanger body 10; the pressure is continuously kept, the releasing shear pin 3 between the cylinder 9 and the setting shear pin 2 is sheared, the positioning sliding sleeve 4 goes up, the block 5 falls into the groove (the rectangular hole groove on the pipe body of the positioning sliding sleeve 4) of the positioning sliding sleeve 4, the setting shear pin 2 is separated from the hanger body 10. The drilling tool is lifted, the internal setting tool is taken out of the well.

Claims

1. An internal slip liner hanger suitable for use in a small clearance horizontal well, characterized by: It includes lifting sub (1), coupling (2), release shear pin (3), positioning sliding sleeve (4), inner tube (8) and suspension body (10), the lower end of lifting sub (1) is provided with external thread and internal thread, the lower end of lifting sub (1) is connected with coupling (2) through external thread, and is connected with inner tube (8) through internal thread; The lower end of coupling (2) is connected with upper snap spring sleeve (6), positioning sliding sleeve (4) is sleeved in coupling (2), and is connected with coupling (2) through release shear pin (3), and the outer side of coupling (2) is connected with suspension body (10); Suspension body (10) is provided with slip groove (26), and slip groove (26) is connected with slip (15); The lower end of suspension body (10) is connected with short section (22); The lower end of inner tube (8) is connected with fixing nut (21), the outer side of inner tube (8) is sleeved with hydraulic cylinder (9), the lower end of hydraulic cylinder (9) is sequentially connected with piston (17) and centralizing sleeve (20), and the outer side of piston (17) is further sleeved with slip sleeve (16), and the lower end of slip sleeve (16) is connected with lower snap spring sleeve (18).

2. A running tool for use in a small clearance horizontal well according to claim 1, characterized in that: The outer side of the pipe body of coupling (2) and the inner side of suspension body (10) are both provided with stop block groove (23), the two stop block grooves (23) are inserted with stop block (5), and the stop block (5) fixes coupling (2) and suspension body (10).

3. A running tool for use in a small clearance horizontal well according to claim 1, characterized in that: The inner side of upper snap spring sleeve (6) and lower snap spring sleeve (18) is both provided with snap spring groove, the inner side of the snap spring groove of upper snap spring sleeve (6) is provided with upper snap spring (7), and the inner side of the snap spring groove of lower snap spring sleeve (18) is provided with lower snap spring (19).

4. A running tool for use in a small clearance horizontal well according to claim 1, characterized in that: The upper side of slip (15) is further connected with positioning pin (11), and the positioning pin (11) is connected with suspension body (10).

5. A running tool for use in a small clearance horizontal well according to claim 1, characterized in that: The pipe body of inner tube (8) is provided with pressure transmission hole (30).

6. An inner slip liner hanger suitable for use in a small clearance horizontal well according to claim 1, characterized in that: The outer side of piston (17) and centralizing sleeve (20) is sleeved with inner tube (8).

7. A running tool for use in a small clearance horizontal well according to claim 1, characterized in that: It also includes positioning shear pin (13) and sitting suspension shear pin (12), the outer side of piston (17) is connected with positioning shear pin (13), and is fixed with inner tube (8) through positioning shear pin (13); and the outer side of piston (17) is fixed with slip sleeve (16) through sitting suspension shear pin (12).

8. A running tool for use in a small clearance horizontal well according to claim 1, characterized in that: The outer side of slip sleeve (16) and slip (15) is both provided with slip positioning groove (25), the inner side of slip positioning groove (25) is provided with slip positioning block (14), and the outer side of slip sleeve (16) and slip (15) is connected and fixed.

9. A running tool for use in a small clearance horizontal well according to claim 1, characterized in that: The lower end surface of coupling (2) and the upper end surface of suspension body (10) are both provided with torque groove (24) matched with each other.

10. The inner slip basepipe hanger suitable for small clearance horizontal wells of claim 1, wherein: The outer side of slip (15) is further connected with positioning pin (11).

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