Turntable slip structure

Abstract

A rotary table slip structure relates to the technical field of petroleum drilling and well repairing, a hydraulic cylinder is hinged to a rotary table, a supporting sleeve is arranged on the rotary table on the inner side of the hydraulic cylinder, the inner side of the supporting sleeve is connected with a rotary sleeve through a bearing, a spacer bush, a shaft retainer ring and a hole retainer ring, and an inner hole of the rotary sleeve is connected with a slip through a dovetail groove guide rail. The device has the beneficial effects that when the pipe column is locked, the hydraulic cylinder descends, the hydraulic cylinder drives the pressure plate to descend, the guide sleeve of the pressure plate presses the slip to descend, the slip moves towards the center under the action of the dovetail groove guide rail to clamp the pipe column, at the moment, the torsion block of the pressure plate is inserted into the key groove to transmit torque, and when the pipe column is subjected to other operations and does not need to rotate, the hydraulic cylinder ascends, and the slip moves to the center to clamp the pipe column. The torsion block is separated from the key groove. The slips and the tubular column freely rotate in the inner shell of the rotating disc, due to the fact that the slips and the rotating sleeve are self-locked, the slips clamp the tubular column and cannot loosen, and the slips can only hold the tubular column more and more tightly under the hanging load effect of the tubular column.

Description

Technical Field

[0001] The invention relates to the technical field of oil drilling and well repairing, and in particular to a rotary table slip structure. Background Art

[0002] During oil well drilling and repair operations, a turntable is generally installed at the wellhead, and then slips are installed inside the turntable. The slips clamp the pipe string to suspend the weight of the pipe string. During the operation, rotating operations such as milling and drilling are often encountered. At this time, in addition to providing rotational power to the pipe string, a rotating slip that can always hold the pipe string during the rotating operation is also required to cooperate with the construction. When the existing hydraulic slips need to rotate the pipe string, the hydraulic control pipeline must be removed, which will cause the pipe string to be in an incompletely controlled state and easily cause pipe crossover accidents. Summary of the invention

[0003] In order to solve the problem that the current turntable slips work unreliably, the present invention provides a turntable slip structure.

[0004] The technical solution provided by the present invention is: a turntable slip structure, comprising a turntable, a hinge on the turntable connected to a hydraulic cylinder, a support sleeve provided on the inner side of the hydraulic cylinder, the inner side of the support sleeve connected to a rotating sleeve through a bearing, a spacer sleeve, a shaft retaining ring and a hole retaining ring, and the inner hole of the rotating sleeve connected to the slip through a dovetail groove guide rail; There are four slips, which are evenly distributed along the circumference of the inner hole of the rotating sleeve. The dovetail groove guide rail between the slips and the rotating sleeve is at an inclination angle with the axis of the rotating sleeve. When the slips descend, the direction of the inclination angle is: the slips move toward the center of the rotating sleeve at the same time; The upper part of the hydraulic cylinder is hinged to the pressure plate, and a guide sleeve is extended downward from the pressure plate. The guide sleeve is connected with the inner hole of the rotating sleeve by clearance fit. Four torque blocks are extended outward from the outer circle of the guide sleeve. The torque blocks are evenly distributed around the circumference. Four key slots are opened downward from the top of the inner hole of the rotating sleeve. The key slots are evenly distributed around the circumference. The width of the torque block and the width of the key slot are clearance fit. An annular step is arranged at the lower part of the rotating sleeve, and compression springs are arranged at the upper part of the annular step and the bottom of the slip.

[0005] The lower end surface of the guide sleeve is provided with an annular groove, and the electromagnetic coil is fixedly connected in the annular groove.

[0006] The inclination angle of the dovetail groove guide rail is smaller than the friction angle between the rotating sleeve and the slip.

[0007] The upper opening of the support sleeve is provided with four notches evenly distributed around the circumference, and the pressure plate extends four limit blocks downward at corresponding positions of the notches.

[0008] The slip is made of 40Cr material with high overall strength. A layer of lining plate is welded on the clamping surface on the slip side, and the material of the lining plate is Q235B.

[0009] The beneficial effects of the present invention are as follows: when locking the pipe column, the hydraulic cylinder descends, the hydraulic cylinder drives the pressure plate to descend, the guide sleeve of the pressure plate presses the slip to descend, the slip moves toward the center under the action of the dovetail groove guide rail, and clamps the pipe column. At this time, the torsion block of the pressure plate is inserted into the keyway to transmit torque. When the pipe column performs other operations and does not need to rotate, the hydraulic cylinder rises, the torsion block is separated from the keyway, and the sleeve is rotated. The slip and the pipe column rotate freely in the inner shell of the turntable. Due to the self-locking between the slip and the rotating sleeve, the slip will not loosen the pipe column. The slip will only hold tighter and tighter under the hanging weight of the pipe column. The slip is designed to be composite. The rigid slip body has high strength. The liner made of soft steel can adapt to the deformed and worn pipe column and produce corresponding elastic deformation, so that the contact area between the slip and the pipe column is larger, the clamping force is stronger, the structure is simple, and the working condition switching is reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Attached Figure 1 It is a schematic diagram of the structure of the present invention; Attached Figure 2 It is a structural schematic diagram of the pressure plate in the present invention; Attached Figure 3 It is a schematic diagram of the structure of the slips in the present invention; Attached Figure 4 It is a structural schematic diagram of the turntable in the present invention; Attached Figure 5 It is a working diagram of the present invention.

[0011] In the figure, 1-turntable, 2-hydraulic cylinder, 3-support sleeve, 31-notch, 4-rotating sleeve, 41-annular step, 42-keyway, 5-pressure plate, 51-torque block, 52-annular groove, 53-guide sleeve, 54-limiting block, 6-slip, 61-lining plate, 7-dovetail groove guide rail, 8-bearing, 9-spacer sleeve, 10-electromagnetic coil. DETAILED DESCRIPTION

[0012] like Figures 1 to 5 As shown, a turntable slip structure comprises a turntable 1, a hydraulic cylinder 2 is connected to the turntable 1 by a hinge, a support sleeve 3 is provided on the inner side of the hydraulic cylinder 2, the inner side of the support sleeve 3 is connected to a rotating sleeve 4 through a bearing 8, a spacer sleeve 9, a shaft retaining ring and a hole retaining ring, and the inner hole of the rotating sleeve 4 is connected to a slip 6 through a dovetail groove 7 guide rail; There are four slips 6, which are evenly distributed along the circumference of the inner hole of the rotating sleeve 4. The dovetail groove guide rail 7 between the slips 6 and the rotating sleeve 4 forms an inclination angle with the axis of the rotating sleeve 4. The direction of the inclination angle is: when the slips 6 are lowered, the slips 6 move toward the center of the rotating sleeve 4 at the same time. The upper part of the hydraulic cylinder 2 is hingedly connected to the pressure plate 5, and a guide sleeve 53 is extended downward from the pressure plate 5, and the guide sleeve 53 is connected with the inner hole of the rotating sleeve 4 by clearance fit, and four torsion blocks 51 are extended outward from the outer circle of the guide sleeve 53, and the torsion blocks 51 are evenly distributed around the circumference, and four key slots 42 are opened downward from the top of the inner hole of the rotating sleeve 4, and the key slots 42 are evenly distributed around the circumference, and the width of the torsion block 51 and the width of the key slot 42 are clearance fit; An annular step 41 is provided at the lower part of the rotating sleeve 4, and compression springs are provided at the upper part of the annular step 41 and the bottom of the slip 6. The compression spring supports the slip 6 so that in the absence of external force, the inner hole of the slip 6 is larger than the outer diameter of the clamped pipe column.

[0013] An annular groove 52 is formed on the lower end surface of the guide sleeve 53, and an electromagnetic coil 10 is fixedly connected in the annular groove 52. When the pipe string is disassembled, the hydraulic cylinder 2 is depressurized, the guide sleeve 53 falls on the slip 6, the electromagnetic coil 10 is energized, the magnetic force attracts the slip 6, and the piston of the hydraulic cylinder 2 rises, moving the slip 6 upward and separating it from the pipe string.

[0014] The inclination angle of the dovetail groove guide rail 7 is smaller than the friction angle between the rotating sleeve 4 and the slips 6, that is, the rotating sleeve 4 and the slips 6 are self-locking in the radial direction.

[0015] The upper opening of the support sleeve 3 is provided with four circumferentially evenly distributed notches 31, and the pressure plate 5 extends four limit blocks 54 downward at the corresponding positions of the notches 31. When the hydraulic cylinder descends, the limit blocks are inserted into the notches, so that the pressure plate and the support sleeve are limited in rotation, and the torque is not transmitted by the hydraulic cylinder.

[0016] The slip 6 is made of 40Cr material with high overall strength. A layer of lining plate 61 is welded on the clamping surface on the inner side of the slip 6. The material of the lining plate 61 is Q235B. Q235B is a soft steel with the characteristics of low strength and high toughness. When clamping the pipe column, it can adapt to the deformed and worn pipe column and produce corresponding elastic deformation, so that the contact area between the slip 6 and the pipe column is larger and the clamping force is stronger.

[0017] When locking the pipe string, the hydraulic cylinder 2 descends, and the hydraulic cylinder 2 drives the pressure plate 5 to descend. The guide sleeve 53 of the pressure plate 5 presses the slip 6 to descend. The slip 6 moves toward the center under the action of the dovetail groove guide rail 7 to clamp the pipe string. At this time, the torque block 51 of the pressure plate 5 is inserted into the key slot 42 to transmit torque. When the pipe string performs other operations and the pipe string does not need to rotate, the hydraulic cylinder 2 rises, the torque block 51 is separated from the key slot 42, and the rotating sleeve 4 is rotated. The slip 6 and the pipe string rotate freely in the inner shell of the rotating disk 1. Due to the self-locking between the slip 6 and the rotating sleeve 4, the slip 6 will not loosen the pipe string, and the slip 6 will only hold it tighter and tighter under the hanging weight of the pipe string.

[0018] The present application designs the clamping and rotation drive of the slip 6 separately, and adopts a self-locking rotating sleeve 4 and slip 6. The slip 6 will not loosen after clamping the pipe column, and the slip 6 will only clamp tighter and tighter under the hanging weight of the pipe column. The function of the hydraulic cylinder 2 is: the hydraulic cylinder 2 descends, driving the pressure plate 5 to descend, and the torsion block 51 of the pressure plate 5 is inserted into the key slot 42 to transmit the torque. At the same time, the guide sleeve 53 presses the slip 6 to descend, and the slip 6 clamps the pipe column. The hydraulic cylinder 2 rises, driving the pressure plate 5 to disengage from the rotating sleeve 4, and the rotating sleeve 4 and the slip 6 rotate freely with the pipe column. When it is necessary to loosen the clamping of the pipe column, the hydraulic cylinder 2 releases pressure, and the guide sleeve 53 falls on the slip 6. The electromagnetic coil 10 is energized, and the magnetic force attracts the slip 6. The hydraulic cylinder 2 rises, and the slip 6 is moved up and separated from the pipe column.

Claims

1. A turntable slip structure, comprising a turntable (1), characterized in that: The upper hinge of the rotating disk (1) is connected to the hydraulic cylinder (2); the rotating disk (1) is provided with a support sleeve (3) on the inner side of the hydraulic cylinder (2); the inner side of the support sleeve (3) is connected to the rotating sleeve (4) through a bearing (8), a spacer sleeve (9), a shaft retaining ring and a hole retaining ring; the inner hole of the rotating sleeve (4) is connected to the slip (6) through a dovetail groove (7) guide rail; There are four slips (6), which are evenly distributed along the circumference of the inner hole of the rotating sleeve (4). The dovetail groove guide rail (7) between the slips (6) and the rotating sleeve (4) forms an inclination angle with the axis of the rotating sleeve (4), and the direction of the inclination angle is such that when the slips (6) descend, the slips (6) simultaneously move toward the center of the rotating sleeve (4); The upper part of the hydraulic cylinder (2) is hingedly connected to the pressure plate (5), and a guide sleeve (53) is extended downward from the pressure plate (5), and the guide sleeve (53) is connected with the inner hole of the rotating sleeve (4) by clearance fit, and four torque blocks (51) are extended outward from the outer circle of the guide sleeve (53), and the torque blocks (51) are evenly distributed around the circumference, and four key slots (42) are opened downward from the top of the inner hole of the rotating sleeve (4), and the key slots (42) are evenly distributed around the circumference, and the width of the torque block (51) and the width of the key slot (42) are clearance fit; An annular step (41) is provided at the lower part of the rotating sleeve (4), and a compression spring is provided at the upper part of the annular step (41) and the bottom of the slip (6).

2. A turntable slip structure according to claim 1, characterized in that: The lower end surface of the guide sleeve (53) is provided with an annular groove (52), and the electromagnetic coil (10) is fixedly connected in the annular groove (52).

3. A turntable slip structure according to claim 1, characterized in that: The inclination angle of the dovetail groove guide rail (7) is smaller than the friction angle between the rotating sleeve (4) and the slip (6).

4. A turntable slip structure according to claim 1, characterized in that: The upper opening of the support sleeve (3) is provided with four notches (31) evenly distributed around the circumference, and the pressure plate (5) extends four limit blocks (54) downwardly at positions corresponding to the notches (31).

5. The turntable slip structure according to claim 1, characterized in that: The slip (6) is made of 40Cr material, and a layer of lining plate (61) is welded on the clamping surface on the inner side of the slip (6), and the material of the lining plate (61) is Q235B.

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