High-displacement starting and pitching device

Abstract

The utility model discloses a high-displacement opening ball throwing device which comprises an upper connector and a lower connector which are connected with each other, and a first step is formed on the lower middle portion in the upper connector. An isolation ball embedding groove is formed in the middle of the inner wall of the lower joint, and a certain number of isolation balls are placed in the isolation ball embedding groove; a mandrel is arranged in the upper joint and the lower joint, the mandrel comprises a large-diameter part and a small-diameter part which are connected, a circular bead is formed at the joint of the large-diameter part and the small-diameter part, and the circular bead is matched with the first step; the large-diameter part is connected with the upper joint through a shear pin, and a nozzle is arranged in the large-diameter part; a through groove is formed in the middle lower part of the small-diameter part, and the through groove corresponds to the isolation ball embedding groove in position. The remote control ball throwing device can achieve remote control ball throwing, isolation balls do not need to be thrown at a wellhead, the midway retention risk of the isolation balls is greatly reduced, operation is easy, and construction safety is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of oil and natural gas development, especially relates to a high-displacement opening ball launching device. BACKGROUND

[0002] In the process of oil and natural gas development drilling and completion, the wellhead is often launched with an isolation ball, a ball seat is arranged in the downhole string, the isolation ball falls onto the ball seat by using the weight and fluid thrust, and the fluid in the string is blocked from circulating to the well bottom. If there is no bypass hole in the string above the ball seat, pressure is generated in the string, and if there is a bypass hole in the string above the ball seat, the fluid is circulated through the bypass, and the liquid flow in the string between the well bottom and the bypass hole is blocked. Through the above actions, various downhole operations such as tool release, sliding sleeve switching, circulation well flushing, and drilling plugging can be performed.

[0003] For conventional wellhead launching of an isolation ball, the pipe diameter of the string above the isolation position must be greater than the outer diameter of the isolation ball. In horizontal wells, the isolation ball needs to pass through a long horizontal section, and there is a risk of stalling halfway. In order to meet the required production requirements, the above problems need to be solved. UTILITY MODEL CONTENTS

[0004] The utility model discloses a high-displacement opening ball launching device to solve the above technical problems.

[0005] The utility model discloses the following technical scheme is adopted to be realized.

[0006] A high-displacement opening ball launching device, comprising an upper joint and a lower joint connected, the lower part of the upper joint forms a step one, the inner wall of the lower joint is provided with an isolation ball embedding groove, and a certain number of isolation balls are placed in the isolation ball embedding groove; a mandrel is arranged in the upper joint and the lower joint, the mandrel comprises a large-diameter part and a small-diameter part connected, a shoulder is formed at the connection of the large-diameter part and the small-diameter part, and the shoulder is matched with the step one; the large-diameter part is connected with the upper joint through a shear pin, and a nozzle is arranged in the large-diameter part; the lower part of the small-diameter part is provided with a through groove, and the through groove is arranged at a position corresponding to the isolation ball embedding groove.

[0007] Further, a certain number of threaded holes penetrating the side wall are arranged in the upper part of the upper joint; a shear pin embedding groove is formed in the outer wall of the large-diameter part in a circumferential direction, and a shear pin is embedded in the threaded hole and the shear pin embedding groove.

[0008] Further, a snap spring is arranged on the inner wall of the large-diameter part above the nozzle.

[0009] Further, a thread for connecting an upper tool is arranged at the upper end of the upper joint; and a thread for connecting a lower tool is arranged at the lower end of the lower joint.

[0010] Further, the upper joint and the lower joint are threadedly connected.

[0011] This application has the following beneficial effects.

[0012] This utility model's high-displacement ball-launching device requires only one ball loading, which is then lowered along with the lower ball seat. The high-displacement ball-launching device enables remote control of ball launching, eliminating the need to launch isolation balls at the wellhead. This significantly reduces the risk of isolation balls getting stuck midway, simplifies operation, and improves construction safety. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the mandrel structure of this utility model;

[0015] Figure 3 This is a schematic diagram of the throwing state of this utility model.

[0016] Among them, 1. Upper connector; 11. Step 1; 2. Shear pin; 3. Snap ring; 4. Nozzle; 5. Mandrel; 51. Large diameter section; 52. Small diameter section; 53. Through groove; 54. Shear pin embedding groove; 6. Lower connector; 61. Isolation ball embedding groove; 62. Step 2; 7. Isolation ball. Detailed Implementation

[0017] The present patent application will be further described below with reference to the embodiments.

[0018] like Figures 1-3 As shown, a high-displacement ball-throwing device includes an upper connector 1, a lower connector 6, a spindle 5, a nozzle 4, a retaining ring 3, an isolation ball 7, and a shearing pin 2. The upper connector 1 has a threaded connection at its upper end for connecting to an upper tool, and its lower end is threadedly connected to the upper end of the lower connector 6. The lower connector 6 has a threaded connection at its lower end for connecting to a lower tool.

[0019] The upper connector 1 is a hollow cylindrical structure. The upper part of the upper connector 1 is provided with a certain number of threaded holes that penetrate the side wall. The threaded holes are used for screwing in the shear pin 2. A step 11 is formed in the lower part of the upper connector 1, so that the upper diameter of the inner circumference of the upper connector 1 is larger than that of the lower diameter of the inner circumference. The upper inner circumference of the upper connector 1 is adapted to the outer circumference of the large diameter part 51 of the mandrel 5, and the lower inner circumference of the upper connector 1 is adapted to the outer circumference of the small diameter part 52 of the mandrel 5.

[0020] The lower connector 6 is a hollow cylindrical structure. An isolation ball embedding groove 61 is provided in the middle of the inner wall of the lower connector 6. A certain number of isolation balls 7 are placed inside the isolation ball embedding groove 61. The groove depth and groove width of the isolation ball embedding groove 61 are greater than the outer diameter of the isolation balls 7. The isolation balls 7 can be completely hidden inside the isolation ball embedding groove 61. A step 2 62 is formed in the lower part of the lower connector 6.

[0021] The core shaft 5 is placed in the upper joint 1 and the lower joint 6, including a large diameter part 51 arranged above and a small neck part 52 arranged below, the inner diameter of the large diameter part 51 is larger than the inner diameter of the small neck part 52, the outer diameter of the large diameter part 51 is larger than the outer diameter of the small neck part 52, and a shoulder is formed at the joint of the large diameter part 51 and the small neck part 52; a shear pin embedding groove 54 is arranged on the outer periphery of the large diameter part 51, a certain number of shear pins 2 are screwed into the shear pin embedding groove 54 on the outer periphery of the upper joint 1, and the fixation of the core shaft 5 is realized; a nozzle 4 is arranged in the large diameter part 51, the inner diameter of the large diameter part 51 is matched with the outer diameter of the nozzle 4, a groove is formed on the inner wall of the large diameter part 51 above the nozzle 4, a snap spring 3 is arranged in the groove, and the snap spring 3 is used for fixing the nozzle 4.

[0022] Two through grooves 53 are arranged in the middle and lower parts of the small neck part 52, the through grooves 53 are penetrated from the outer periphery to the inner periphery, and the width of the through grooves 53 is larger than the diameter of the isolation ball 7. The inner diameter of the small neck part 52 is larger than the diameter of the isolation ball 7, the outer diameter of the small neck part 52 is matched with the inner diameter of the lower joint 6, and the isolation ball 7 is prevented from sliding off. When the shoulder between the large diameter part 51 and the small neck part 52 is in contact with the step one 11 of the upper joint 1, and the end of the small neck part 52 is placed on the step two 62, the through groove 53 corresponds to the isolation ball embedding groove 61.

[0023] The working principle of the high-displacement opening ball dropping device is as follows:

[0024] The tool is connected with the upper tool and the lower ball seat through upper and lower end threads, as shown in the figure, Figure 1 Before the tool is put into the well, a certain number of shear pins 2 are screwed into the outer periphery of the upper joint 1, the small diameter part of the core shaft 5 is placed in the lower joint 6, and the isolation ball embedding groove 61 is shielded, so that the ball cannot fall into the hole of the core shaft 5. When the ball dropping operation is required, the displacement is increased, the pressure difference generated by the nozzle 4 is increased, the core shaft 5 moves downward under the action of the increased pressure difference after shearing the shear pin 2, and when the shoulder of the core shaft 5 is in contact with the step one 11 of the upper joint 1, as shown in the figure, Figure 2 the through groove 53 corresponds to the isolation ball embedding groove 61 of the lower joint 6, the isolation ball 7 slides into the hole of the core shaft 5 and moves to the lower drilling tool ball seat, and the fluid flow to the lower pipe string is blocked. If there is no bypass hole in the upper pipe string, the pressure is built up, and if there is a bypass hole, the fluid flows through the bypass hole to return to the wellhead.

[0025] The embodiments of the specific embodiment are preferred embodiments of the utility model, and do not limit the protection scope of the utility model, so that: equivalent changes made according to the structure, shape and principle of the utility model should be covered in the protection scope of the utility model.

Claims

1. A high volume opening pitching device characterized by: The application relates to a connecting joint for connecting a top tool and a bottom tool, which comprises a top joint (1) and a bottom joint (6) connected with each other, a step (11) is formed in the middle lower part of the top joint (1), an isolation ball embedding groove (61) is arranged in the middle part of the inner wall of the bottom joint (6), a certain number of isolation balls (7) are arranged in the isolation ball embedding groove (61), a mandrel (5) is arranged in the top joint (1) and the bottom joint (6), the mandrel (5) comprises a large-diameter part (51) and a small-diameter part (52) connected with each other, a shoulder is formed at the connecting position of the large-diameter part (51) and the small-diameter part (52), the shoulder is matched with the step (11), the large-diameter part (51) is connected with the top joint (1) through a shear pin (2), a nozzle (4) is arranged in the large-diameter part (51), a through groove (53) is arranged in the middle lower part of the small-diameter part (52), and the through groove (53) is arranged at a position corresponding to the isolation ball embedding groove (61).

2. A high volume open cup filling device according to claim 1, wherein: A certain number of threaded holes penetrating the side wall are arranged in the middle upper part of the top joint (1), and a shear pin embedding groove (54) is formed in the outer wall of the large-diameter part (51) in a circumferential direction, the shear pin (2) is embedded in the threaded hole and the shear pin embedding groove (54).

3. A high volume open cup filling apparatus as defined in claim 1, wherein: A clamping spring (3) is arranged on the inner wall of the large-diameter part (51) above the nozzle (4).

4. A high volume open cup filling apparatus as defined in claim 1, wherein: A threaded hole for connecting the top tool is arranged at the upper end of the top joint (1), and a threaded hole for connecting the bottom tool is arranged at the lower end of the bottom joint (6).

5. A high volume open cup filling device according to claim 1 wherein: The top joint (1) is connected with the bottom joint (6) through threads.

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