Top-drive rotary casing running device with anti-rotation locking mechanism

Abstract

The invention belongs to the technical field of oil and gas exploration and development equipment, and relates to a top-drive rotary lower casing device with an anti-rotation locking mechanism, which comprises an upper connector, a lower body, an oil cylinder body, a sliding body and a piston, a plurality of U-shaped key grooves which are evenly distributed in an annular mode are formed in the outer side wall of the top of the piston, a plurality of bosses which are evenly distributed in an annular mode are fixedly arranged on the inner side wall of the oil cylinder body, the bosses correspond to the U-shaped key grooves in a one-to-one mode, and the bosses are embedded in the U-shaped key grooves and are in sliding fit with the U-shaped key grooves. The top-drive rotary casing running device can be used for casing running operation, the boss and the U-shaped key groove are arranged between the piston and the oil cylinder body to form an anti-rotation locking mechanism, so that circumferential constraint is formed between the piston and the oil cylinder body, the piston cannot rotate along with the upper connecting body and the lower body, the piston and the oil cylinder body can be kept relatively fixed in the circumferential direction, and the top-drive rotary casing running device can be used for casing running operation. And the sealing ring between the piston and the oil cylinder body and the guide slip ring can be prevented from rotating relative to the oil cylinder body to cause high-temperature sealing damage.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas exploration and development equipment, and relates to a top drive rotating casing device with an anti-rotation locking mechanism. Background Art

[0002] Casing cementing is an essential operation in drilling engineering. Top drive casing lowering has significant advantages. The existing top drive rotary casing lowering device integrates the functions of elevator, hydraulic clamp and circulating mud, and can realize the clamping, buckling, rotation, lifting and lowering of casing. It has high operation efficiency, safety and reliability. However, during the casing lowering process of the top drive rotary casing lowering device, the piston will rotate with the rotating device, and the continuous rotation of the kinematic pair will produce continuous friction, affecting the seal. At the same time, the severe temperature rise will also accelerate the failure of the seal, seriously affecting the service life of the top drive rotary casing lowering device. Summary of the invention

[0003] The purpose of the present invention is to provide a top drive rotating casing lowering device with an anti-rotation locking mechanism, wherein the casing lowering device is provided with an anti-rotation locking mechanism between the piston and the cylinder body, so that the piston and the cylinder body are circumferentially fixed to prevent circumferential rotation between the two, so as to solve the problems raised in the above-mentioned background technology.

[0004] The present invention is achieved through the following technical solutions:

[0005] A top drive rotating casing lowering device with an anti-rotation locking mechanism comprises an upper connecting body, a lower body threadedly connected to the bottom end of the upper connecting body, a cylinder body rotatably arranged outside the upper connecting body, a sliding body slidably arranged outside the lower body, and a piston arranged between the cylinder body and the sliding body; the top outer wall of the piston is provided with a plurality of U-shaped key grooves evenly distributed in an annular shape, and the U-shaped key grooves penetrate to the top surface of the piston, and the inner side wall of the cylinder body is fixedly provided with a plurality of bosses evenly distributed in an annular shape, the plurality of bosses correspond to the plurality of U-shaped key grooves one by one, and the bosses are embedded in the U-shaped key grooves and slideably cooperate with them, and an anti-rotation locking mechanism is formed between the piston and the cylinder body through the clamping structure of the plurality of bosses and the plurality of U-shaped key grooves, so that a circumferential constraint is formed between the piston and the cylinder body, which can prevent the piston from being driven to rotate continuously under the action of friction during the rotation of the upper connecting body and the lower body, so that the piston and the cylinder body are kept relatively fixed in the circumferential direction, and the piston can slide axially along the cylinder body under the sliding cooperation of the bosses and the U-shaped key grooves.

[0006] According to further regulations, an upper end bearing is arranged between the top inner wall of the cylinder body and the outer wall of the upper connector, and the cylinder body and the upper connector are rotatably connected via the upper end bearing; an upper end cover is mounted on the outside of the upper connector, and the upper end cover is fixedly connected to the top of the cylinder body via a plurality of upper end cover bolts.

[0007] According to further definition, a lower end cover is provided at the bottom end of the cylinder body, an annular groove for the lower end cover to be inserted into is opened on the outer wall of the bottom end of the piston, the inner wall of the lower end cover is in contact with the groove wall gap of the annular groove, and the lower end cover is fixedly connected to the bottom end of the cylinder body by a plurality of lower end cover bolts.

[0008] According to further regulations, a chamber for containing hydraulic oil is formed between the inner wall of the cylinder body and the outer wall of the piston, an upper sealing ring and an upper guide sliding ring are arranged between the inner wall of the cylinder body on the upper side of the chamber and the outer wall of the piston, and a lower sealing ring and a lower guide sliding ring are arranged between the inner wall of the cylinder body on the lower side of the chamber and the outer wall of the piston, so that the upper and lower sides of the chamber are sealed.

[0009] According to further definition, a lower end bearing is arranged between the inner wall of the bottom end of the piston and the outer wall of the top end of the sliding body, and the piston and the sliding body are rotatably connected through the lower end bearing; a lower bearing end cover is mounted on the outside of the sliding body, and the lower bearing end cover and the bottom end of the piston are fixedly connected by multiple lower bearing end cover bolts.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] The top drive rotating casing lowering device can be used for casing lowering operation. A boss and a U-shaped keyway are provided between the piston and the cylinder body to form an anti-rotation locking mechanism, so that a stable and reliable circumferential constraint is formed between the piston and the cylinder body. When the upper connecting body and the lower body rotate to control the buckling of the casing, the piston will not rotate with the upper connecting body and the lower body, so that the piston and the cylinder body can be kept relatively fixed in the circumferential direction, and the sealing ring between the piston and the cylinder body and the guide sliding ring and the cylinder body can be prevented from continuously rotating relative to each other to cause high temperature damage to the seal; the piston and the sliding ring The moving bodies can rotate relative to each other through the lower end bearing. There is no assembly relationship between the piston and the upper connecting body and the lower body, and they are separated by a gap. During the rotation of the upper connecting body and the lower body, the piston will not rotate accordingly. The lower end bearing forms an axial constraint between the piston and the sliding body, so that the axial movement of the piston and the sliding body is consistent. Under the sliding cooperation between the boss and the U-shaped keyway, the piston can slide axially along the cylinder body. When the hydraulic oil drives the piston to move axially, it can drive the sliding body to move axially, thereby driving the slip to reset / open, and then loosen / clamp the sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0013] Figure 1It is a cross-sectional structural schematic diagram of the casing running device of the present invention;

[0014] Figure 2 for Figure 1 A schematic diagram of the enlarged local structure at center A;

[0015] Figure 3 It is a schematic diagram of the main structure of the casing running device of the present invention;

[0016] Figure 4 It is a schematic diagram of the three-dimensional structure of the casing running device of the present invention;

[0017] Figure 5 It is a schematic diagram of the explosion structure of the casing running device of the present invention;

[0018] Figure 6 It is a schematic diagram of the three-dimensional structure of the oil cylinder body in the casing running device of the present invention.

[0019] The names of the components in the figure are: 1. Upper connector; 2. Upper end cover; 3. Upper bearing; 4. Cylinder body; 5. Piston; 6. Lower end cover; 7. Lower bearing; 8. Lower bearing end cover; 9. Sliding body; 10. Lower body; 11. Lower bearing end cover bolt; 12. Lower end cover bolt; 13. Lower guide slip ring; 14. Lower sealing ring; 15. Upper sealing ring; 16. Upper guide slip ring; 17. U-shaped keyway; 18. Upper end cover bolt; 19. Boss. DETAILED DESCRIPTION

[0020] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0021] In the description of the present application, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] A top drive rotating casing device with an anti-rotation locking mechanism, such as Figures 1 to 5 As shown, it comprises an upper connecting body 1, a lower body 10 threadedly connected to the bottom end of the upper connecting body 1, a cylinder body 4 rotatably arranged outside the upper connecting body 1, a sliding body 9 slidably arranged outside the lower body 10, and a piston 5 arranged between the cylinder body 4 and the sliding body 9;

[0023] like Figure 1 and Figure 2As shown, an upper end bearing 3 is arranged between the top inner side wall of the oil cylinder body 4 and the outer side wall of the upper connector 1, and the oil cylinder body 4 and the upper connector 1 are rotatably connected through the upper end bearing 3, so that the oil cylinder body 4 and the upper connector 1 can rotate relative to each other; an upper end cover 2 is sleeved on the outside of the upper connector 1, and the upper end cover 2 and the top of the oil cylinder body 4 are fixedly connected by a plurality of upper end cover bolts 18, which can protect the upper end bearing 3 to prevent the upper end bearing 3 from being damaged or falling out;

[0024] like Figure 1 and Figure 2 As shown, a lower end cover 6 is provided at the bottom end of the oil cylinder body 4, and an annular groove for the lower end cover 6 to be inserted into the outer wall of the bottom end of the piston 5 is provided, and the inner wall of the lower end cover 6 is in contact with the groove wall gap of the annular groove, and the lower end cover 6 is fixedly connected to the bottom end of the oil cylinder body 4 by a plurality of lower end cover bolts 12, and the piston 5 can move axially in the oil cylinder body 4, and the lower end cover 6 limits the piston 5 in the oil cylinder body 4 to prevent the piston 5 from falling out from the bottom end of the oil cylinder body 4;

[0025] like Figure 1 and Figure 2 As shown, a chamber for containing hydraulic oil is formed between the inner wall of the cylinder body 4 and the outer wall of the piston 5, an upper sealing ring 15 and an upper guide sliding ring 16 are arranged between the inner wall of the cylinder body 4 on the upper side of the chamber and the outer wall of the piston 5, and a lower sealing ring 14 and a lower guide sliding ring 13 are arranged between the inner wall of the cylinder body 4 on the lower side of the chamber and the outer wall of the piston 5, so that the upper and lower sides of the chamber are sealed to prevent the hydraulic oil in the chamber from leaking during the axial movement of the piston 5 in the cylinder body 4;

[0026] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, the top outer wall of the piston 5 is provided with four U-shaped key grooves 17 evenly distributed in an annular shape, and the U-shaped key grooves extend to the top surface of the piston 5, and the inner wall of the cylinder body 4 is fixedly provided with four bosses 19 evenly distributed in an annular shape, and the four bosses 19 correspond to the four U-shaped key grooves 17 one by one, and the bosses 19 are embedded in the U-shaped key grooves 17 and slide with them, and an anti-rotation locking mechanism is formed between the piston 5 and the cylinder body 4 through the engagement structure of the four bosses 19 and the four U-shaped key grooves 17, so that the piston 5 and the cylinder body 4 are fixedly engaged with each other. A stable and reliable circumferential constraint is formed between the cylinder body 4, which can prevent the piston 5 from being driven to rotate continuously under the action of friction during the rotation of the upper connecting body 1 and the lower body 10, so that the piston 5 and the cylinder body 4 are relatively fixed in the circumferential direction, so that there is no relative rotation between the upper guide slip ring 16, the upper sealing ring 15, the lower sealing ring 14 and the lower guide slip ring 13 and the cylinder body 4, which can avoid high temperature damage to the seal. Under the sliding cooperation between the boss 19 and the U-shaped keyway 17, the piston 5 can slide axially along the cylinder body 4;

[0027] like Figure 1 and Figure 2 As shown, a lower end bearing 7 is arranged between the inner side wall of the bottom end of the piston 5 and the outer side wall of the top end of the sliding body 9. The piston 5 and the sliding body 9 are rotatably connected through the lower end bearing 7, so that the piston 5 and the sliding body 9 can rotate relative to each other. The lower end bearing 7 forms an axial constraint between the piston 5 and the sliding body 9, and the piston 5 and the sliding body 9 can move synchronously along the axial direction; a lower bearing end cover 8 is sleeved on the outside of the sliding body 9, and the lower bearing end cover 8 and the bottom end of the piston 5 are fixedly connected by a plurality of lower bearing end cover bolts 11, which can protect the lower end bearing 7 to prevent the lower end bearing 7 from being damaged or falling out, so that the axial movement between the piston 5 and the sliding body 9 is consistent, and there is no assembly relationship between the piston 5 and the upper connecting body 1 and the lower body 10, and they are separated by a gap. During the rotation of the upper connecting body 1 and the lower body 10, the piston 5 will not rotate therewith.

[0028] The working principle of the anti-rotation locking mechanism in the top drive rotary casing device is:

[0029] When the top drive rotary casing lowering device is used for casing lowering operation, the upper connecting body 1 is connected to the top drive power system of the drilling rig, so that the top drive power system of the drilling rig can drive the upper connecting body 1 and the lower body 10 to rotate to accurately control the casing buckle torque during the casing lowering operation, and the hydraulic structure composed of the cylinder body 4, the piston 5, etc. drives the sliding body 9 and the slips on the lower body 10 to reset / open, and then loosen / clamp the casing to transmit the rotation and lifting load, and complete the buckle, lifting and lowering of the casing and the rotation of the casing.

[0030] When the upper connector 1 and the lower body 10 rotate to control the buckling of the sleeve, an anti-rotation locking mechanism is formed between the piston 5 and the cylinder body 4 by the boss 19 and the U-shaped keyway 17, so that a stable and reliable circumferential constraint is formed between the piston 5 and the cylinder body 4, and the piston 5 will not rotate with the upper connector 1 and the lower body 10, so that the piston 5 and the cylinder body 4 are kept relatively fixed in the circumferential direction, so that there is no relative rotation between the upper guide slip ring 16, the upper sealing ring 15, the lower sealing ring 14 and the lower guide slip ring 13 and the cylinder body 4, which can avoid high temperature damage to the seal;

[0031] When the hydraulic structure drives the sliding body 9 and the slips on the lower body 10 to reset / open, and then loosen / clamp the sleeve, based on the relative rotation between the piston 5 and the sliding body 9 through the lower end bearing 7, the lower end bearing 7 forms an axial constraint between the piston 5 and the sliding body 9, and under the sliding cooperation between the boss 19 and the U-shaped keyway 17, the piston 5 can slide axially along the cylinder body 4, so that the axial movement between the piston 5 and the sliding body 9 is consistent, and when the hydraulic oil drives the piston 5 to move axially, it can drive the sliding body 9 to move axially, thereby driving the slips to reset / open, and then loosen / clamp the sleeve.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A top drive rotating casing device with an anti-rotation locking mechanism, comprising an upper connecting body (1), a lower body (10) threadedly connected to the bottom end of the upper connecting body (1), a cylinder body (4) rotatably arranged outside the upper connecting body (1), a sliding body (9) slidably arranged outside the lower body (10), and a piston (5) arranged between the cylinder body (4) and the sliding body (9), characterized in that: The outer wall at the top end of the piston (5) is provided with a plurality of U-shaped key grooves (17) evenly distributed in an annular shape, and the U-shaped key grooves (17) extend through the top surface of the piston (5); the inner wall of the oil cylinder body (4) is fixedly provided with a plurality of bosses (19) evenly distributed in an annular shape, the plurality of bosses (19) correspond to the plurality of U-shaped key grooves (17) one by one, and the bosses (19) are embedded in the U-shaped key grooves (17) to slide therewith.

2. The top drive rotating casing device with an anti-rotation locking mechanism according to claim 1, characterized in that: An upper end bearing (3) is arranged between the inner side wall at the top end of the cylinder body (4) and the outer side wall of the upper connecting body (1), and the cylinder body (4) and the upper connecting body (1) are rotatably connected via the upper end bearing (3); an upper end cover (2) is sleeved on the outside of the upper connecting body (1), and the upper end cover (2) and the top end of the cylinder body (4) are fixedly connected via a plurality of upper end cover bolts (18).

3. The top drive rotating casing device with an anti-rotation locking mechanism according to claim 1, characterized in that: The bottom end of the oil cylinder body (4) is provided with a lower end cover (6); the outer wall of the bottom end of the piston (5) is provided with an annular groove into which the lower end cover (6) can be inserted; the inner wall of the lower end cover (6) is in contact with the groove wall of the annular groove; the lower end cover (6) is fixedly connected to the bottom end of the oil cylinder body (4) by a plurality of lower end cover bolts (12).

4. The top drive rotating casing running device with an anti-rotation locking mechanism according to claim 3 is characterized in that: A chamber for containing hydraulic oil is formed between the inner wall of the cylinder body (4) and the outer wall of the piston (5); an upper sealing ring (15) and an upper guide sliding ring (16) are arranged between the inner wall of the cylinder body (4) on the upper side of the chamber and the outer wall of the piston (5); and a lower sealing ring (14) and a lower guide sliding ring (13) are arranged between the inner wall of the cylinder body (4) on the lower side of the chamber and the outer wall of the piston (5).

5. The top drive rotary casing running device with an anti-rotation locking mechanism according to claim 1, characterized in that: The outer side wall of the top end of the piston (5) is provided with four U-shaped key grooves (17) evenly distributed in an annular shape, and the inner side wall of the oil cylinder body (4) is fixedly provided with four bosses (19) evenly distributed in an annular shape, the four bosses (19) correspond to the four U-shaped key grooves (17) one by one, and the bosses (19) are embedded in the U-shaped key grooves (17) to slide therewith.

6. The top drive rotary casing running device with an anti-rotation locking mechanism according to claim 1, characterized in that: A lower end bearing (7) is arranged between the inner side wall of the bottom end of the piston (5) and the outer side wall of the top end of the sliding body (9), and the piston (5) and the sliding body (9) are rotatably connected via the lower end bearing (7); a lower bearing end cover (8) is sleeved on the outside of the sliding body (9), and the lower bearing end cover (8) and the bottom end of the piston (5) are fixedly connected via a plurality of lower bearing end cover bolts (11).

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