A circulating setting nipple

Abstract

The utility model discloses a kind of circulating setting short sections, it includes tubular column body, upper joint and ball seat core are sequentially installed from top to bottom in the tubular column body, two circulation holes that are communicated with the installation cavity are opened on the ball seat core, ball seat inner boss that is adapted to setting ball is provided between the two circulation holes, inner slide sleeve is equipped in the installation cavity, inner slide block is equipped between the upper end of inner slide sleeve and the ball seat core, the inner slide block is above the circulation hole in upper end, the lower end of inner slide sleeve is opened with the communication hole that is adapted to lower end circulation hole, limit piece is provided below inner slide sleeve. The whole working process of the utility model is by controlling pressure in tubular column, sequentially cutting first shear pin and second shear pin, realize the movement of inner slide sleeve and inner slide block, relatively simple and controllable in operating process, it is convenient for operating personnel to carry out accurate operation according to actual situation.

Description

Technical Field

[0001] This utility model relates to the field of oilfield downhole tool technology, specifically to a circulating setting short section. Background Technology

[0002] A circulating setting sub is a tool that can be run downhole along with a segmented tubing string. Through a specific operating procedure, it can achieve functions such as setting ball placement, tubing string sealing, packer setting, and circulation channel establishment to meet the needs of different downhole operation stages.

[0003] Currently, the circulating setting short sections used in conventional segmented tubing are generally fixed ball seats, meaning the ball seat only provides a place for the setting ball to sit. Once the ball seat is in place, circulation is no longer possible; if the ball seat seal is not reliable, the packer cannot be set properly. Utility Model Content

[0004] The purpose of this invention is to provide a cyclic setting short section to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, this utility model provides a circulating setting short section, which includes a column body. An upper connector and a ball seat core are sequentially installed inside the column body from top to bottom. The ball seat core is characterized in that: the upper end of the ball seat core is connected to the column body; an installation cavity is formed between the lower end of the ball seat core and the column body; and two circulation holes communicating with the installation cavity are opened on the ball seat core. An inner boss adapted to the setting ball is provided between the two circulation holes. An inner sliding sleeve is provided inside the installation cavity. The inner sliding sleeve is sleeved on the outside of the ball seat core and connected to the ball seat core by a first shear pin. An inner slider is provided between the upper end of the inner sliding sleeve and the ball seat core. The inner slider is located above the upper circulation hole and connected to the ball seat core by a second shear pin. A communicating hole adapted to the lower circulation hole is opened at the lower end of the inner sliding sleeve. A limiting member is provided below the inner sliding sleeve.

[0006] Furthermore, a first sealing ring is provided on both sides of the inner slider, and the two first sealing rings contact the ball seat core and the inner sliding sleeve respectively.

[0007] Furthermore, a second sealing ring is provided at both ends of the lower end of the circulation hole, and the two sides of the second sealing ring contact the ball seat core and the inner sliding sleeve, respectively.

[0008] Furthermore, a limiting groove is opened at the lower end of the ball seat core, the limiting groove is located above the limiting member, and a first retaining ring is installed at the bottom of the inner sliding sleeve through a retaining ring sleeve. The first retaining ring is adapted to the limiting groove, and the limiting member is a limiting sleeve.

[0009] Furthermore, a second retaining ring is provided between the bottom of the inner slider and the outer wall of the ball seat core, and the second retaining ring is installed on the ball seat core.

[0010] Furthermore, the second shear pin is disposed on the top of the inner slider.

[0011] Furthermore, a plurality of inner bosses of the ball seat are provided at intervals from top to bottom between the two circulation holes.

[0012] The beneficial effects of this invention are as follows: By setting a double sealing structure of an inner slider and an inner sliding sleeve, during the setting stage, the inner slider and inner sliding sleeve first seal the upper circulation hole, and then the movement of the inner sliding sleeve achieves overall sealing of the tubing string, providing a stable and reliable pressure environment for packer setting and effectively ensuring the setting quality of the packer. Simultaneously, after the packer is set, this device can increase the pressure to shear the second shear pin, causing the inner slider to move upward and re-establish the circulation channel, enabling downhole circulation operations. This avoids many inconveniences caused by the inability to circulate after setting and improves operational efficiency.

[0013] The entire working process of this utility model involves controlling the pressure inside the tubing column to sequentially cut the first and second shear pins, thereby moving the inner sliding sleeve and the inner slider. The operation is relatively simple and controllable, making it easy for operators to perform precise operations according to actual conditions. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0015] The components are: 1. Tube column body; 2. Upper connector; 3. Ball seat core; 4. Circulation hole; 5. Inner boss of ball seat; 6. Inner sliding sleeve; 7. First shear pin; 8. Inner slider; 9. Second shear pin; 10. Connecting hole; 11. Limiting component; 12. First sealing ring; 13. Second sealing ring; 14. Limiting groove; 15. Snap ring sleeve; 16. First snap ring; 17. Second snap ring; 18. Sealing ball. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only one embodiment of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] To make the objectives, technical solutions and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments.

[0018] In the following description, references to "an embodiment," "an embodiment," "an example," "example," etc., indicate that the described embodiment or example may include a particular feature, structure, characteristic, property, element, or limitation, but not every embodiment or example necessarily includes that particular feature, structure, characteristic, property, element, or limitation. Furthermore, the repeated use of the phrase "an embodiment according to this application," while possibly referring to the same embodiment, does not necessarily refer to the same embodiment.

[0019] like Figure 1 As shown, this utility model discloses a circulating sealing short section, which includes a column body 1. Inside the column body 1, an upper connector 2 and a ball seat core 3 are installed sequentially from top to bottom. The upper end of the ball seat core 3 is connected to the column body 1. An installation cavity is formed between the lower end of the ball seat core 3 and the column body 1. The ball seat core 3 has two circulation holes 4 that communicate with the installation cavity. An inner boss 5 adapted to the setting ball 18 is provided between the two circulation holes 4. An inner sliding sleeve 6 is provided in the installation cavity. The inner sliding sleeve 6 is sleeved on the outside of the ball seat core 3 and connected to the ball seat core 3 by a first shear pin 7. An inner slider 8 is provided between the upper end of the inner sliding sleeve 6 and the ball seat core 3. The inner slider 8 is located above the upper circulation hole 4 and connected to the ball seat core 3 by a second shear pin 9. A communicating hole 10 adapted to the lower circulation hole 4 is provided at the lower end of the inner sliding sleeve 6. A limiting member 11 is provided below the inner sliding sleeve 6.

[0020] In the initial state, the inner sliding sleeve 6 is connected to the ball seat core 3 through the first shear pin 7, and the inner sliding block 8 is connected to the ball seat core 3 through the second shear pin 9. The upper end of the inner sliding sleeve 6, the inner sliding block 8 and the outer wall of the ball seat core 3 together form a sealed space. The upper circulation hole 4 is set in this sealed space, so that the upper circulation hole 4 of the ball seat core 3 is not connected to the inside of the column body 1. The connecting hole 10 at the lower end of the inner sliding sleeve 6 is aligned with the lower circulation hole 4 of the ball seat core 3, and the inside of the ball seat core 3 is connected to the inside of the column body 1.

[0021] When setting is required, after the segmented tubing is lowered into place, the setting ball 18 is cyclically inserted. The setting ball 18 enters the ball seat core 3 and sits on the inner boss 5 of the ball seat. At this time, relevant operations can be performed to increase the pressure inside the tubing and transmit pressure from the upper circulation hole 4. When the pressure reaches the shear value of the first shear pin 7, the first-stage pin is sheared, the inner sliding sleeve 6 moves down until it sits on the limiting member 11. The position of the inner slider 8 remains unchanged, and the outer wall is still in contact with the inner wall of the inner sliding sleeve 6 to seal the upper circulation hole 4. The connecting hole 10 is misaligned with the lower circulation hole 4, realizing the overall sealing of the tubing and establishing pressure for the setting packer.

[0022] When all packers are set, if circulation is still desired, the pressure is increased. When the pressure reaches the shear value of the second shear pin 9, the second-level pin is sheared, and the inner slider 8 moves upward until the outer side of the inner slider 8 no longer contacts the inner side of the inner sleeve 6, so that the upper circulation hole 4 is connected to the inside of the column body 1, and the upper and lower parts of the column are connected to establish a circulation channel.

[0023] This invention employs a dual-sealing structure consisting of an inner slider 8 and an inner sliding sleeve 6. During the setting stage, the inner slider 8 and inner sliding sleeve 6 first cooperate to seal the upper circulation hole 4. Then, the movement of the inner sliding sleeve 6 achieves overall sealing of the tubing string, providing a stable and reliable pressure environment for packer setting and effectively ensuring the setting quality of the packer. Furthermore, after packer setting is complete, this device can increase pressure to shear the second shear pin 9, causing the inner slider 8 to move upward and re-establish the circulation channel, enabling downhole circulation operations. This avoids the numerous inconveniences caused by the inability to circulate after setting and improves operational efficiency.

[0024] The entire working process of this utility model involves controlling the pressure inside the tubing column to sequentially cut the first shear pin 7 and the second shear pin 9, thereby realizing the movement of the inner sliding sleeve 6 and the inner slider 8. The operation process is relatively simple and controllable, making it easy for operators to perform precise operations according to the actual situation.

[0025] In one embodiment, a first sealing ring 12 is provided on both sides of the inner slider 8, and the two first sealing rings 12 contact the ball seat core 3 and the inner sliding sleeve 6 respectively. The first sealing rings 12 on both sides of the inner slider 8 are in close contact with the ball seat core 3 and the inner sliding sleeve 6 respectively. These two first sealing rings 12 further enhance the sealing performance between the inner slider 8 and the ball seat core 3 and the inner sliding sleeve 6 in the initial state, effectively preventing fluid leakage in the sealed space, ensuring that the upper circulation hole 4 is in a reliable sealed isolation state, and providing stable initial conditions for subsequent setting and other operations.

[0026] In one embodiment, a second sealing ring 13 is provided at both ends of the lower circulation hole 4, and the two sides of the second sealing ring 13 contact the ball seat core 3 and the inner sliding sleeve 6, respectively. The second sealing ring 13 provided at both ends of the lower circulation hole 4, with its two sides contacting the ball seat core 3 and the inner sliding sleeve 6, further ensures the sealing effect between the inner sliding sleeve 6 and the ball seat core 3 at the lower circulation hole 4.

[0027] In this embodiment, both the first sealing ring 12 and the second sealing ring 13 are O-rings.

[0028] In one embodiment, a limiting groove 14 is formed at the lower end of the ball seat core 3. The limiting groove 14 is located above the limiting member 11. A first retaining ring 16 is installed at the bottom of the inner sliding sleeve 6 through a retaining ring sleeve 15. The first retaining ring 16 is adapted to the limiting groove 14, and the limiting member 11 is a limiting sleeve. The limiting sleeve is fitted outside the ball seat core 3 and is in a preset position, providing a limiting reference for the downward movement of the inner sliding sleeve 6. In this embodiment, the retaining ring sleeve 15 is installed on the inner sliding sleeve 6, and the retaining ring sleeve 15, the bottom of the inner sliding sleeve 6, and the outer wall of the ball seat core 3 form an installation space. The first retaining ring 16 is disposed in the installation space.

[0029] During the downward movement of the inner sliding sleeve 6, the first retaining ring 16, installed at the bottom of the inner sliding sleeve 6 via the retaining ring sleeve 15, also moves downward. When the inner sliding sleeve 6 moves to a certain position, the first retaining ring 16 enters the limiting groove 14 at the lower end of the ball seat core 3. Since the first retaining ring 16 is adapted to the limiting groove 14, when the first retaining ring 16 enters the limiting groove 14, it will limit the downward movement of the inner sliding sleeve 6, ensuring that the inner sliding sleeve 6 accurately sits on the limiting sleeve, preventing the inner sliding sleeve 6 from continuing to move downward due to excessive pressure or other factors, which could damage the tool or affect subsequent operations. This avoids the situation where the inner sliding sleeve 6 moves too far or not to the correct position, improving the accuracy and reliability of the setting process, and ensuring that subsequent packer setting and cyclic operations can proceed smoothly according to design requirements.

[0030] In one embodiment, a second retaining ring 17 is provided between the bottom of the inner slider 8 and the outer wall of the ball seat core 3. The second retaining ring 17 is mounted on the ball seat core 3 and plays a certain role in auxiliary fixing and positioning of the inner slider 8. In the initial state and during the setting stage, it can effectively prevent the inner slider 8 from moving downwards unexpectedly due to various external factors, ensuring the relative positional accuracy of the inner slider 8 and surrounding components, thereby ensuring the integrity and effectiveness of the sealing structure and reducing the risk of seal failure caused by the movement of the inner slider 8.

[0031] In one embodiment, the second shear pin 9 is disposed on the top of the inner slider 8.

[0032] In one embodiment, multiple inner bosses 5 of the ball seat are provided at intervals from top to bottom between the two circulation holes 4. The multiple inner bosses 5 of the ball seat provide multiple stable seating positions for the setting ball 18, which can accommodate setting balls 18 of different sizes and specifications, ensuring that the setting ball 18 can accurately and stably land in the appropriate position after being put in, effectively blocking the upward flow channel of fluid inside the ball seat core 3, and improving the reliability and success rate of setting.

[0033] Meanwhile, multiple inner protrusions 5 of the ball seat are spaced apart between the two circulation holes 4, and spare balls are provided, which greatly increases the probability of successful sealing by the setting ball 18. Even if the first ball fails to seal for various reasons, the spare ball still has multiple suitable seating positions to choose from, avoiding the risk of failure of the entire setting operation due to the failure of a single ball seat or a single ball, and ensuring the smooth progress of downhole operations.

[0034] In this embodiment, there are two protrusions 5 inside the ball seat. If the sealing ball 18 fails to achieve a sealing effect after being inserted, a spare sealing ball can be inserted to perform the sealing. This can greatly reduce operational risks, save operational time, and reduce operational costs.

[0035] The workflow of this utility model embodiment is as follows:

[0036] In the initial state, the inner sliding sleeve 6 is connected to the ball seat core 3 via the first shear pin 7, and the inner slider 8 is connected to the ball seat core 3 via the second shear pin 9. A second retaining ring 17 is provided between the bottom of the inner slider 6 and the outer wall of the ball seat core 3, which assists in fixing and positioning the inner slider 8. The upper end of the inner sliding sleeve 6, the inner slider 8, and the outer wall of the ball seat core 3 together form a sealed space. The upper circulation hole 4 is located in this sealed space, ensuring that the upper circulation hole 4 of the ball seat core 3 is not connected to the interior of the tubular body 1. The lower connecting hole 10 of the inner sliding sleeve 6 is aligned with the lower circulation hole 4 of the ball seat core 3, and the interior of the ball seat core 3 is connected to the interior of the tubular body 1.

[0037] When setting is required, the cyclic setting section is typically lowered along with the segmented tubing. After the segmented tubing is in place, the setting ball 18 is cyclically inserted. The setting ball 18 enters the ball seat core 3 and sits on the inner boss 5 of the ball seat. At this time, pressure is applied into the tubing, transmitted through the upper circulation hole 4. When the pressure reaches the shear value of the first shear pin 7, the first-stage pin is sheared, and the inner sliding sleeve 6 moves down until it sits on the upper end face of the limiting sleeve. The first retaining ring 16 will then engage in the limiting groove 14 at the lower end of the ball seat core 3. The second retaining ring 17 stabilizes the position of the inner sliding block 8, and its outer wall remains in contact with the inner wall of the inner sliding sleeve 6, sealing the upper circulation hole 4. The connecting hole 10 is misaligned with the lower circulation hole 4, achieving overall sealing of the tubing and establishing pressure for the setting packer. If the setting ball 18 fails to provide a seal, there is no need to remove the tubing from the wellhead for complex processing. Instead, a spare ball can be directly inserted into the tubing, and pressure can be applied to perform a second sealing operation until all packers at each stage are set.

[0038] When all packers are set, if circulation is still desired, the pressure is increased. When the pressure reaches the shear value of the second shear pin 9, the second-level pin is sheared, and the inner slider 8 moves upward until the outer side of the inner slider 8 no longer contacts the inner side of the inner sleeve 6, so that the upper circulation hole 4 is connected to the inside of the column body 1, and the upper and lower parts of the column are connected to establish a circulation channel.

[0039] The above description of the disclosed embodiments enables those skilled in the art to implement or use this invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, this invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A circulating setting sub, comprising a tubular body, wherein an upper connector and a ball seat core are sequentially installed from top to bottom inside the tubular body, characterized in that: The upper end of the ball seat core is connected to the column body. A mounting cavity is formed between the lower end of the ball seat core and the column body. Two circulation holes communicating with the mounting cavity are opened on the ball seat core. An inner boss of the ball seat, adapted to the setting ball, is provided between the two circulation holes. An inner sliding sleeve is provided in the mounting cavity. The inner sliding sleeve is sleeved on the outside of the ball seat core and connected to the ball seat core by a first shear pin. An inner slider is provided between the upper end of the inner sliding sleeve and the ball seat core. The inner slider is located above the upper circulation hole and connected to the ball seat core by a second shear pin. A communicating hole adapted to the lower circulation hole is opened at the lower end of the inner sliding sleeve. A limiting member is provided below the inner sliding sleeve.

2. The cyclic setting sub section according to claim 1, characterized in that: The inner slider is provided with a first sealing ring on both sides, and the two first sealing rings are in contact with the ball seat core and the inner sliding sleeve respectively.

3. The cyclic setting sub according to claim 1, characterized in that: A second sealing ring is provided at both ends of the lower end of the circulation hole, and the two sides of the second sealing ring contact the ball seat core and the inner sliding sleeve, respectively.

4. The cyclic setting sub according to claim 1, characterized in that: The lower end of the ball seat core has a limiting groove, which is located above the limiting member. The bottom of the inner sliding sleeve is fitted with a first retaining ring through a retaining ring sleeve. The first retaining ring is adapted to the limiting groove. The limiting member is a limiting sleeve.

5. A cyclic setting sub according to claim 4, characterized in that: A second retaining ring is provided between the bottom of the inner slider and the outer wall of the ball seat core, and the second retaining ring is installed on the ball seat core.

6. A cyclic setting sub according to claim 5, characterized in that: The second shear pin is disposed on the top of the inner slider.

7. A cyclic setting sub according to claim 1, characterized in that: Multiple inner bosses of the ball seat are provided at intervals from top to bottom between the two circulation holes.

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