Novel top drive casing running device

Abstract

The utility model discloses a novel top drive casing running device, which belongs to the technical field of drilling and production equipment, solves the problems that the casing running device is insufficient in structural strength and sealing performance and poor in impact resistance, and comprises a rotary positioning sealing mechanism, a push-pull hydraulic cylinder mechanism, a slip clamping mechanism and a circulating sealing mechanism, the rotary positioning sealing mechanism is installed at the top end of the casing running device and connected with the push-pull hydraulic cylinder mechanism, the bottom end of the push-pull hydraulic cylinder mechanism is connected with the slip clamping mechanism, and the circulating sealing mechanism is installed in the slip clamping mechanism. The casing running device is used for being matched with top drive equipment to carry out casing running operation in drilling and production, and has the advantages of being high in impact resistance and good in sealing performance.

Description

Technical Field

[0001] The utility model belongs to the technical field of drilling equipment, and specifically relates to a novel top drive casing device. Background Art

[0002] The casing running device is a tool used for casing running based on the top drive during drilling operations. Its structure usually adopts a dual-channel design to separate the rotation of the equipment from the weight. When the top drive casing running device is operating, it can both rotate and press down the cementing casing and bear the weight of the clamped cementing casing.

[0003] The existing casing lowering device, when subjected to continuous pressure, has a pressure-resistant structure and a sealing mechanism that are affected by high pressure and wear, resulting in a short service life of the equipment, weak impact resistance, and easily worn and unreliable seals, requiring frequent maintenance and replacement. Utility Model Content

[0004] The purpose of the utility model is to:

[0005] In order to solve the problems of insufficient structural strength and sealing performance and poor impact resistance of casing running devices in the prior art, a novel top drive casing running device is provided.

[0006] The technical solution adopted by the utility model is as follows:

[0007] A novel top drive casing running device comprises a rotary positioning sealing mechanism, a push-pull hydraulic cylinder mechanism, a slip clamping mechanism and a circulating sealing mechanism. The rotary positioning sealing mechanism is installed at the top of the casing running device, the rotary positioning sealing mechanism is connected to the push-pull hydraulic cylinder mechanism, the bottom end of the push-pull hydraulic cylinder mechanism is connected to the slip clamping mechanism, and the circulating sealing mechanism is installed inside the slip clamping mechanism.

[0008] Furthermore, the rotary positioning sealing mechanism includes a core shaft assembly, an annular groove is provided on the core shaft assembly, an upper retaining ring is installed in the annular groove, the upper retaining ring is connected to an upper retaining ring seat, an upper cylinder is connected to the lower part of the upper retaining ring seat by bolts, a slip ring frame is also connected between the upper cylinder and the upper retaining ring seat, a bearing is installed in the slip ring frame, and two groups of bearings are provided from top to bottom.

[0009] Furthermore, the push-pull cylinder mechanism includes a sliding sleeve, which is connected to the inner side of the upper cylinder, a working spring is connected between the outer surface of the core shaft assembly and the inner surface of the sliding sleeve, the lower end surface of the upper cylinder is connected to the lower end cover by bolts, the bottom end of the sliding sleeve is connected to a hinge support, the hinge support is connected to a connecting rod, and a connecting rod pin is connected between the connecting rod and the hinge support.

[0010] Furthermore, the cava clamping mechanism includes a tooth plate seat connected to the bottom end of the connecting rod, a tooth plate is installed on the tooth plate seat to form a tooth plate assembly, three groups of tooth plate assemblies are evenly arranged around the central axis of the lower casing device, guide plates are arranged between adjacent tooth plate assemblies, a load-bearing sleeve is connected to the periphery of the guide plate and the tooth plate seat, the guide plate is connected to the inner wall of the load-bearing sleeve by screws, the top end of the load-bearing sleeve is connected to the bottom end of the core shaft assembly, and the bottom end of the load-bearing sleeve is connected to the guide sleeve.

[0011] Furthermore, the circulation sealing mechanism is installed in a load-bearing sleeve, a circulation sealing groove for accommodating the circulation sealing mechanism is opened in the load-bearing sleeve, the circulation sealing mechanism includes two mud sealing sleeves installed in the circulation sealing groove, a sealing spacer is connected between the two mud sealing sleeves, the mud sealing sleeve is connected to an auxiliary guide sleeve, and the auxiliary guide sleeve is connected to the circulation sealing groove by a threaded connection.

[0012] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0013] The casing lowering device of the utility model can clamp the downhole casing to rotate and overcome the friction resistance and mill the well wall under the rotational power provided by the top drive equipment, so as to achieve the effect of strong resistance overcoming in the well during the casing lowering operation. During the rotation, the piston formed in the push-pull cylinder mechanism and the slip clamping mechanism rotate simultaneously. At this time, the piston inside the cylinder and the slip ring of the rotary positioning sealing mechanism rotate relatively. Since the pressure needs to be continuously output, a rotary sealing mechanism is designed to seal the annular oil channel. Therefore, the annular oil groove can be precisely positioned in the radial direction through the bearing combination distributed up and down, which not only ensures the precise positioning of the annular seal in the rotating state, but also has sufficient rigidity to resist the impact of external forces on the rotary seal, thereby realizing reliable and effective continuous operation of the seal, reducing the wear of the rotary seal, and improving the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a cross-sectional view of the internal structure of the utility model in one direction;

[0015] Figure 2 This is a cross-sectional view of the internal structure of the utility model in one direction

[0016] Figure 3 It is an axonometric diagram of the overall structure of the utility model;

[0017] Figure 4 It is an axonometric view of the tooth plate assembly of the utility model;

[0018] Figure 5 It is an axonometric view of the tooth plate assembly of the utility model from another direction;

[0019] Markings in the figure: 1- mandrel assembly, 2-upper retaining ring, 3-upper retaining ring seat, 4-slip ring frame, 5-working spring, 6-upper cylinder, 7-slip sleeve, 8-lower end cover, 9-hinge support, 10-connecting rod pin, 11-mud sealing sleeve, 12-sealing spacer, 13-connecting rod, 14-load-bearing sleeve, 15-tooth plate seat, 16-guide plate, 17-tooth plate, 18-guide sleeve, 19-auxiliary guide sleeve. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in combination with the embodiments below. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0021] A novel top drive casing lowering device comprises a rotary positioning sealing mechanism, a push-pull hydraulic cylinder mechanism, a slip clamping mechanism and a circulating sealing mechanism. The rotary positioning sealing mechanism is installed at the top of the casing lowering device, the rotary positioning sealing mechanism is connected to the push-pull hydraulic cylinder mechanism, the bottom end of the push-pull hydraulic cylinder mechanism is connected to the slip clamping mechanism, and the circulating sealing mechanism is installed inside the slip clamping mechanism.

[0022] The rotary positioning sealing mechanism includes a core shaft assembly 1, which is provided with an annular groove, in which an upper retaining ring 2 is installed, the upper retaining ring 2 is connected to an upper retaining ring seat 3, an upper cylinder 6 is connected to the lower part of the upper retaining ring seat 3 by bolts, a slip ring frame 4 is also connected between the upper cylinder 6 and the upper retaining ring seat 3, a bearing is installed in the slip ring frame 4, and two groups of bearings are arranged from top to bottom.

[0023] The rotary positioning seal mechanism is composed of an upper snap ring 2, an upper snap ring seat 3, a slip ring frame 4, an upper cylinder 6, and two deep groove ball bearings distributed in the upper and lower parts. The upper snap ring 2 is combined with the upper snap ring seat 3 and assembled together in the annular groove of the mandrel assembly 1. The upper snap ring seat 3 is connected to the upper cylinder 6 by bolts; the slip ring frame 4 is assembled between the upper snap ring seat 3 and the upper cylinder 6 coaxially with the mandrel.

[0024] The push-pull cylinder mechanism includes a sliding sleeve 7, which is connected to the inner side of the upper cylinder 6. A working spring 5 is connected between the outer surface of the core shaft assembly 1 and the inner surface of the sliding sleeve 7. The lower end surface of the upper cylinder 6 is connected to the lower end cover 8 by bolts. The bottom end of the sliding sleeve 7 is connected to a hinge support 9. The hinge support 9 is connected to a connecting rod 13. A connecting rod pin 10 is connected between the connecting rod 13 and the hinge support 9.

[0025] The push-pull hydraulic cylinder mechanism is composed of a sliding sleeve 7, a working spring 5, a lower end cover 8, a hinge support 9, a connecting rod 13, and a connecting rod pin 10. Among them, the working spring 5 is assembled in the space between the mandrel assembly 1 and the sliding sleeve 7; the lower end cover 8 is connected to the lower end surface of the upper cylinder 6 by bolts; the three hinge supports 9, which are evenly distributed at 120° with the axis, are connected to the lower end surface of the sliding sleeve 7 by bolts; the upper part of the connecting rod 13 is connected to the hinge support 9 through the connecting rod pin 10, and the lower part is connected to the tooth plate seat 15 of the slip clamping mechanism.

[0026] The cava clamping mechanism includes a tooth plate seat 15 connected to the bottom end of the connecting rod 13, and a tooth plate 17 is installed on the tooth plate seat 15 to form a tooth plate 17 assembly. Three groups of tooth plate 17 assemblies are evenly arranged around the central axis of the lower casing device. Guide plates 16 are arranged between adjacent tooth plate 17 assemblies. The guide plates 16 and the outer periphery of the tooth plate seat 15 are connected with a load-bearing sleeve 14. The guide plate 16 is connected to the inner wall of the load-bearing sleeve 14 by screws. The top end of the load-bearing sleeve 14 is connected to the bottom end of the core shaft assembly 1, and the bottom end of the load-bearing sleeve 14 is connected with a guide sleeve 18.

[0027] The cava clamping mechanism is composed of a tooth plate 17, a tooth plate seat 15, a guide plate 16, a load-bearing sleeve 14 and a guide sleeve 18. The cava clamping mechanism is designed to adopt a three-piece tooth plate 17 assembly to clamp the outer diameter of the lower casing pipe, wherein the tooth plate 17 assembly is composed of a tooth plate 17 and a tooth plate seat 15 connected by screws, and is connected to the piston and hinge support 9 of the push-pull hydraulic cylinder mechanism through a connecting rod 13 and a connecting rod pin 10, so as to realize the "clamping" when the piston is pushed out and the "relaxing" when it is retracted to drive the cava clamping mechanism (the sliding sleeve 7 slides up and down between the upper cylinder 6 and the core shaft assembly 1, so that it realizes the function of the piston in the push-pull hydraulic cylinder mechanism, and the connecting rod 13 and the tooth plate 17 assembly are designed along an inclined direction as a whole, so that when the sliding sleeve 7 moves upward, the connecting rod 13 is pulled up through the hinge support 9, so that the inclined tooth plate 17 assembly releases the lower casing pipe in an obliquely upward direction, and vice versa, when the sliding sleeve 7 slides downward, the lower casing pipe is clamped).

[0028] The guide plate 16 also adopts a three-piece layout next to the tooth plate 17 assembly, and is connected to the load-bearing sleeve 14 using screws; the load-bearing sleeve 14 is connected to the core shaft assembly 1 at the top and to the guide sleeve 18 at the bottom, and both are connected using threads.

[0029] The circulation sealing mechanism is installed in the load-bearing sleeve 14, and a circulation sealing groove for accommodating the circulation sealing mechanism is opened in the load-bearing sleeve 14. The circulation sealing mechanism includes two mud sealing sleeves 11 installed in the circulation sealing groove, and a sealing spacer 12 is connected between the two mud sealing sleeves 11. The mud sealing sleeves 11 are connected to an auxiliary guide sleeve 19, and the auxiliary guide sleeve 19 is connected to the circulation sealing groove by a threaded connection.

[0030] The circulation sealing mechanism is composed of a mud sealing sleeve 11, a sealing spacer 12 and an auxiliary guide sleeve 19. The two mud sealing sleeves 11 are separated by the sealing spacer 12 and are installed inside the bearing sleeve 14 through the threaded connection between the auxiliary guide sleeve 19 and the bearing sleeve 14.

[0031] The casing lowering device of the utility model is used in combination with a top drive device and is installed below the top drive device. The main shaft of the bearing sleeve 14 of the casing lowering device is connected to the top drive center pipe in a threaded manner to bear the weight of the cementing casing transmitted by the slip clamping mechanism.

[0032] The clamping and loosening actions of the slip clamping mechanism to clamp the cementing casing are driven by the push-pull hydraulic cylinder mechanism. The integrated spring inside the cylinder has the ability to automatically reset the hydraulic cylinder, so that when the clamping pressure is insufficient during the process of clamping the cementing casing, the hydraulic cylinder piston can be ejected to drive the slip clamping mechanism to lock the cementing casing, preventing the casing from slipping and falling due to insufficient clamping force.

[0033] The rotary seal positioning mechanism needs to rotate and lower and press down the clamped casing during the process of dealing with resistance during casing lowering. Under the rotational power provided by the top drive equipment, the casing lowering device can clamp the downhole casing to rotate and overcome friction resistance and mill the well wall, thereby achieving the important function of overcoming resistance in the well during the casing lowering operation.

[0034] Since the piston and the slip clamping mechanism in the hydraulic cylinder push-pull mechanism are installed in one piece, when rotating, the piston and the slip clamping mechanism rotate simultaneously, and at this time, the piston inside the hydraulic cylinder and the sliding ring of the rotary positioning seal mechanism rotate relatively. Since the pressure needs to be continuously output, a rotary sealing mechanism is designed to seal the annular oil channel, so the annular oil groove can be precisely positioned in the radial direction. This structure is realized by a combination of upper and lower distributed bearings. It not only ensures the precise positioning of the annular seal in the rotating state, but also has sufficient rigidity to resist the impact of external forces on the rotary seal, so as to achieve reliable and effective continuous operation of the seal, reduce the wear of the rotary seal, and increase the service life of the equipment.

[0035] The design of the circulation sealing mechanism adopts the method of sealing the outer diameter of the pipe used in the casing operation. When the casing is inserted into the casing device, the seal is achieved through the multi-stage limit guide correction and the double-layer layout design of the circulation sealing mechanism. Its advantage is that the outer diameter of the pipe used for casing is consistent, which can reduce the specifications and models of the seals. Various products on the market use the inner diameter of the casing pipe to seal. Because the inner wall thickness of the pipe produced by different manufacturers has a series of specifications, there are many specifications of seals, and the installation and maintenance workload is large. The circulation sealing mechanism can achieve effective sealing of the high-pressure mud in the casing operation. Its structure is designed as a double-layer seal, and a spacer ring is designed between the seals to ensure that the double-layer seal does not deform when the circulating mud is working under high pressure.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A novel top drive casing running device, characterized in that: It includes a rotary positioning sealing mechanism, a push-pull hydraulic cylinder mechanism, a slip clamping mechanism and a circulation sealing mechanism. The rotary positioning sealing mechanism is installed at the top of the casing lowering device, the rotary positioning sealing mechanism is connected to the push-pull hydraulic cylinder mechanism, the bottom end of the push-pull hydraulic cylinder mechanism is connected to the slip clamping mechanism, and the circulation sealing mechanism is installed inside the slip clamping mechanism; The circulation sealing mechanism is installed in a load-bearing sleeve, and a circulation sealing groove for accommodating the circulation sealing mechanism is opened in the load-bearing sleeve. The circulation sealing mechanism includes two mud sealing sleeves installed in the circulation sealing groove, a sealing spacer is connected between the two mud sealing sleeves, and the mud sealing sleeve is connected to an auxiliary guide sleeve, and the auxiliary guide sleeve is connected to the circulation sealing groove by a threaded connection.

2. A novel top drive casing running device according to claim 1, characterized in that: The rotary positioning sealing mechanism includes a core shaft assembly, an annular groove is provided on the core shaft assembly, an upper retaining ring is installed in the annular groove, the upper retaining ring is connected to an upper retaining ring seat, an upper cylinder is connected to the lower part of the upper retaining ring seat by bolts, a slip ring frame is also connected between the upper cylinder and the upper retaining ring seat, a bearing is installed in the slip ring frame, and two groups of bearings are provided from top to bottom.

3. A novel top drive casing running device according to claim 2, characterized in that: The push-pull cylinder mechanism includes a sliding sleeve, which is connected to the inner side of the upper cylinder, a working spring is connected between the outer surface of the core shaft assembly and the inner surface of the sliding sleeve, the lower end surface of the upper cylinder is connected to the lower end cover by bolts, the bottom end of the sliding sleeve is connected to a hinge support, the hinge support is connected to a connecting rod, and a connecting rod pin is connected between the connecting rod and the hinge support.

4. A novel top drive casing running device according to claim 3, characterized in that: The cava clamping mechanism includes a tooth plate seat connected to the bottom end of the connecting rod, a tooth plate is installed on the tooth plate seat to form a tooth plate assembly, three groups of tooth plate assemblies are evenly arranged around the central axis of the lower casing device, guide plates are arranged between adjacent tooth plate assemblies, a load-bearing sleeve is connected to the periphery of the guide plate and the tooth plate seat, the guide plate is connected to the inner wall of the load-bearing sleeve by screws, the top end of the load-bearing sleeve is connected to the bottom end of the core shaft assembly, and the bottom end of the load-bearing sleeve is connected to the guide sleeve.

Images