A tailpipe hanger system

Abstract

This invention relates to the field of oil and gas cementing tools, and more particularly to a tailpipe hanger system. Existing tailpipe hangers suffer from problems such as premature setting due to downhole pressure fluctuations or failure to set due to cuttings accumulation. This invention includes an insertion tool comprising a body, a rotating cover, and an expansion cone. The body has a central flow channel and a drive flow channel extending along its own axis. The rotating cover is hinged to the body and disposed within the central flow channel. Rotation of the rotating cover blocks the central flow channel, allowing fluid to enter the drive flow channel and push the expansion cone. This invention avoids the need for a hydraulic cylinder to drive the flow channel by rotating the rotating cover. The rotation of the rotating cover enables the flow channel to open and close, achieving pressure-driven operation. Simultaneously, the rotation avoids the situation where cuttings accumulation in the wellbore annulus prevents tailpipe setting when using a hydraulic cylinder, thus ensuring sufficient pressure differential for the tailpipe hanger to expand.

Description

Technical Field

[0001] This invention relates to the field of oil and gas cementing tools, and in particular to a tailpipe hanger system. Background Technology

[0002] Tailpipe hangers are typically used to secure the tailpipe within a previously secured casing or tailpipe string. Tailpipe hangers usually work by radially expanding the slips of the hanger to clamp and seal against the previously secured casing or tailpipe string. Hydraulic cylinders are commonly used to drive this radial expansion of the slips. However, during the running-in process, large downhole pressure fluctuations often lead to premature settling of the tailpipe hanger, or the accumulation of cuttings in the annulus preventing settling. Summary of the Invention

[0003] The purpose of this invention is to provide a tailpipe hanger system to solve the problems of existing tailpipe hangers failing to engage prematurely due to downhole pressure fluctuations or failing to engage due to rock cuttings accumulation.

[0004] To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows:

[0005] A tailpipe suspension system includes an insertion tool comprising a body, a rotating cover, and an expansion cone. The body has a central flow channel and a drive flow channel extending along its own axis. The rotating cover is hinged to the body and disposed within the central flow channel. The rotating cover rotates to block the central flow channel, thereby allowing fluid to enter the drive flow channel to push the expansion cone.

[0006] Furthermore, the feeding tool also includes a drive sleeve, which is inserted into the central flow channel;

[0007] In the initial state, the drive sleeve blocks the drive flow channel;

[0008] The drive sleeve can move along the central flow channel to connect the central flow channel and the drive flow channel; at the same time, the drive sleeve pushes the rotating cover plate to rotate so that the rotating cover plate blocks the central flow channel, thereby allowing fluid to enter the drive flow channel from the central flow channel.

[0009] Furthermore, the feeding tool also includes a first shearing pin, which is simultaneously inserted into the body and the drive sleeve;

[0010] Fluid pressure is applied to the end of the drive sleeve away from the rotating cover plate, causing the drive sleeve to shear the first shear pin and push the rotating cover plate to rotate.

[0011] Furthermore, the feeding tool also includes a connecting pin, which is inserted into the body and connected to the rotating cover plate to keep the central flow channel open;

[0012] When the drive sleeve pushes the rotating cover plate, the connecting pin is sheared off.

[0013] Furthermore, the feeding tool also includes a connecting sleeve, which is fitted onto the body and the expansion cone; the connecting sleeve, the body, and the expansion cone form a pressure chamber, which is connected to the driving flow channel, and fluid enters the pressure chamber to drive the expansion cone to move.

[0014] Furthermore, one end of the rotating cover is hinged to the body, and the other end is provided with a first inclined surface;

[0015] The drive sleeve has a second inclined surface at one end near the rotating cover plate;

[0016] The first inclined surface and the second inclined surface cooperate with each other to make the drive sleeve push the rotating cover plate to rotate.

[0017] Furthermore, the expansion cone is fitted onto the body, and a third inclined surface is provided on the outer side of the body;

[0018] As the fluid propels the expansion cone to move, the third inclined plane guides the expansion cone to expand radially.

[0019] Furthermore, the tailpipe suspension system also includes a suspension tool, and the insertion tool is inserted into the suspension tool;

[0020] The suspension tool includes a slip, the inner wall of which is provided with an expansion groove, and the expansion cone is provided with an expansion protrusion;

[0021] The expansion protrusion can engage with the expansion groove to cause the expansion cone to push the slip to expand radially.

[0022] Furthermore, the suspension tool also includes a cylinder, on which a positioning protrusion is provided, and the inner wall of the slip is provided with a positioning groove;

[0023] In the initial state, the positioning protrusion engages with the positioning groove to fix the latch.

[0024] Furthermore, the cylinder body is provided with a limiting protrusion, and the slip is provided with a limiting groove;

[0025] The limiting protrusion is inserted into the limiting groove and can slide along the limiting groove to limit the axial movement distance of the slip.

[0026] In summary, the technical effects achieved by this invention are as follows:

[0027] The tailpipe hanger system provided by the present invention includes an infeeding tool, which includes a body, a rotating cover plate, and an expansion cone. The body has a central flow channel and a drive flow channel extending along its own axis. The rotating cover plate is hinged to the body and disposed in the central flow channel. The rotating cover plate rotates to block the central flow channel, thereby allowing fluid to enter the drive flow channel to push the expansion cone.

[0028] The tailpipe hanger system provided by this invention avoids the need for hydraulic cylinders by driving a rotating cover plate. The rotation of the rotating cover plate enables the flow channel to open and close for pressure-driven operation. Simultaneously, the rotation avoids the accumulation of rock cuttings in the wellbore annulus that would prevent the tailpipe from being properly seated when using a hydraulic cylinder, thus ensuring sufficient pressure differential to allow the tailpipe hanger to expand. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the tailpipe suspension system provided in an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the upper section structure of the tailpipe suspension system provided in an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the mid-section structure of the tailpipe suspension system provided in an embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of the lower section structure of the tailpipe suspension system provided in an embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of the feeding tool.

[0035] Figure 6 This is a schematic diagram of the rotating cover plate.

[0036] Figure 7 This is a cross-sectional view of Kava.

[0037] Figure 8 This is a schematic diagram of the structure of the Kava.

[0038] Icons: 100, Feeding tool; 110, Body; 120, Rotating cover plate; 130, Expansion cone; 140, Drive sleeve; 150, First shear pin; 160, Connecting pin; 170, Connecting sleeve; 180, Rubber plug; 101, Central flow channel; 102, Drive flow channel; 103, Pressure chamber;

[0039] 200. Hanger tool; 210. Clip; 220. Cylinder; 230. Upper protective sleeve; 240. Lower protective sleeve; 211. Positioning groove; 212. Limiting groove. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0042] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0043] The existing tailpipe suspension uses a hydraulic cylinder drive method, which has the problem of premature engagement due to downhole pressure fluctuations or failure to engage due to rock cuttings accumulation.

[0044] In view of this, the present invention provides a tailpipe hanger system, including an insertion tool 100, the insertion tool 100 including a body 110, a rotating cover plate 120 and an expansion cone 130, the body 110 having a central flow channel 101 and a drive flow channel 102 extending along its own axis; the rotating cover plate 120 is hinged to the body 110 and disposed in the central flow channel 101; the rotating cover plate 120 rotates to block the central flow channel 101, thereby allowing fluid to enter the drive flow channel 102 to push the expansion cone 130.

[0045] The tailpipe hanger system provided by this invention avoids the need for hydraulic cylinder to drive the rotating cover plate 120. The rotation of the rotating cover plate 120 enables the flow channel to be opened and closed for pressure-driven operation. At the same time, the rotation avoids the accumulation of rock cuttings in the wellbore annulus that would prevent the tailpipe from being properly seated when using the hydraulic cylinder, thus ensuring that a sufficient pressure differential is generated to allow the tailpipe hanger to expand.

[0046] The following combination Figures 1-8 The structure and shape of the tailpipe suspension system provided in this embodiment are described in detail below:

[0047] The tailpipe hanger system provided in this embodiment includes a feeding tool 100 and a hanger tool 200. The feeding tool 100 is inserted into the hanger tool 200 and threadedly connected to the hanger tool 200. After the hanger is mounted, the feeding tool 100 can be unlocked and removed by inverting. This structure is conventional and will not be described in detail here.

[0048] In the optional solution provided in this embodiment, the feeding tool 100 includes a body 110, a rotating cover plate 120, an expansion cone 130, a drive sleeve 140, a first shearing pin 150, a connecting pin 160, a connecting sleeve 170, and a rubber stopper 180, as shown below. Figure 4 , Figure 5 As shown.

[0049] Specifically, the body 110 has a central flow channel 101 extending along its own axis, a driving flow channel 102, and an annular connecting groove. The central flow channel 101 is used for fluid passage, and multiple driving flow channels 102 can be provided. The central flow channel 101 and the driving flow channel 102 are connected by the annular connecting groove. The rotating cover plate 120 and the driving sleeve 140 are both disposed in the central flow channel 101, and one end of the rotating cover plate 120 is hinged to the body 110. In the initial state, the driving sleeve 140 blocks the annular connecting groove to cut off the connection between the central flow channel 101 and the driving flow channel 102, and the rotating cover plate 120 is in the open position to keep the central flow channel 101 open. At this time, the fluid flows along the central flow channel 101.

[0050] In this embodiment, for ease of processing and assembly, the body 110 is composed of multiple threaded sleeves, and the shape and size of each sleeve are designed individually as needed.

[0051] In this embodiment, to ensure that the rotating cover 120 fits snugly against the inner wall of the body 110 when opened, the upper surface of the rotating cover 120 is arc-shaped, similar to the inner wall of the body 110. This ensures that the rotating cover 120 fully fits against the inner wall, guaranteeing the passage diameter of the central flow channel 101. Simultaneously, to ensure the rotating cover 120 blocks the central flow channel 101, its top view is circular, allowing it to fit snugly against the inner wall of the body 110 when open. The specific structure of the rotating cover 120 is as follows... Figure 6 As shown, for easy connection and positioning, a connecting crossbar is provided on the rotating cover plate 120. The connecting crossbar protrudes at both ends, with a hinge hole at one end for hinge connection with the body 110, and the other end for engagement with the body 110. When the rotating cover plate 120 rotates to block the central flow channel 101, the connecting crossbar abuts against the limiting groove opened on the body 110 to ensure that the rotating cover plate 120 stops rotating after rotating to a horizontal state, thereby achieving reliable sealing of the central flow channel 101.

[0052] In this embodiment, the first shear pin 150 is simultaneously inserted into the body 110 and the drive sleeve 140 to fix the drive sleeve 140 and prevent the drive sleeve 140 from moving prematurely under fluid pressure; the connecting pin 160 is inserted into the body 110 and connected to the rotating cover plate 120 to keep the central flow channel 101 open. To ensure that the fluid drives the drive sleeve 140 to move, the end of the drive sleeve 140 away from the rotating cover plate 120 does not contact the body 110, and the fluid can directly act on the upper end face of the drive sleeve 140, such as... Figure 5 As shown.

[0053] In this embodiment, to ensure that the drive sleeve 140 can reliably push the rotating cover plate 120 to shear the connecting pin 160 and rotate the rotating cover plate 120 from a vertical state to a horizontal state, one end of the rotating cover plate 120 is hinged to the body 110, and the other end is provided with a first inclined surface. Correspondingly, the end of the drive sleeve 140 near the rotating cover plate 120 is provided with a second inclined surface; the first and second inclined surfaces cooperate with each other to make the drive sleeve 140 push the rotating cover plate 120 to rotate, so that when the drive sleeve 140 moves axially, it can apply a radial thrust to the rotating cover plate 120, thereby causing the rotating cover plate 120 to disengage from the constraint of the connecting pin 160.

[0054] In this embodiment, the connecting sleeve 170 is fitted onto the body 110 and the expansion cone 130. The expansion cone 130 is fitted onto the body 110, and a third inclined surface is provided on the outer side of the body 110 to guide the expansion cone 130 to expand radially. Specifically, the connecting sleeve 170, the body 110, and the expansion cone 130 form a pressure chamber 103, which is connected to the drive flow channel 102. After the drive sleeve 140 pushes the rotating cover plate 120 to swing and close the central flow channel 101, the fluid in the central flow channel 101 flows sequentially through the annular connecting groove, the drive flow channel 102, and the pressure chamber 103. The fluid pressure then acts on the upper end of the expansion cone 130 to push the expansion cone 130 to move and expand radially under the action of the third inclined surface, ultimately causing the hanger tool 200 to be seated.

[0055] In this embodiment, the rubber stopper 180 is fitted onto the body 110 and positioned between the body 110 and the hanger tool 200 to seal the annular space between the body 110 and the hanger tool 200, preventing fluid pressure from below from impacting and pushing it into the tool 100. The body 110 has a groove, and the inner wall of the rubber stopper 180 has a protrusion, thereby securing the rubber stopper 180 to the body 110 via a snap-fit ​​mechanism. When the tool 100 is removed, the rubber stopper 180 is blocked by the protrusion on the hanger tool 200, thus separating from the body 110.

[0056] In this embodiment, the suspension tool 200 includes a slip 210, a cylinder 220, an upper protective sleeve 230, and a lower protective sleeve 240, as follows: Figure 5 As shown. The slip 210 is fitted onto the cylinder 220, and the upper protective sleeve 230 and lower protective sleeve 240 are fitted onto the slip 210. Specifically, the inner wall of the slip 210 is provided with an expansion groove, and the expansion cone 130 is provided with an expansion protrusion; the expansion protrusion can engage with the expansion groove to allow the expansion cone 130 to push the slip 210 to expand radially, thereby cooperating with the third inclined surface to ensure reliable and sufficient expansion of the slip 210.

[0057] The cylinder 220 is provided with a positioning protrusion, and the inner wall of the slip 210 is provided with a positioning groove 211. In the initial state, the positioning protrusion engages with the positioning groove 211 to fix the slip 210. After the slip 210 expands, the positioning groove 211 disengages from the positioning protrusion, thereby allowing the slip 210 to slide axially to strengthen the anchoring of the slip 210. To limit the axial sliding distance of the slip 210 and prevent anchoring failure, the cylinder 220 is provided with a limiting protrusion, and the slip 210 is provided with a limiting groove 212. The limiting protrusion is inserted into the limiting groove 212 and can slide along the limiting groove 212 to limit the axial movement distance of the slip 210. In this embodiment, the upper and lower ends of the engagement surface of the slip 210 are provided with limiting grooves 212 to ensure stable positioning.

[0058] The working process of the tailpipe suspension system provided in this embodiment is as follows:

[0059] The ball is thrown or inserted into the lower part of the tool string to block it, and then fluid is pumped in to pressurize it. The fluid pressure acts on the upper end of the drive sleeve 140 to push the drive sleeve 140 to shear the first shear pin 150 and move the drive sleeve 140 along the central flow channel 101.

[0060] Subsequently, driven by the fluid, the drive sleeve 140 abuts against the rotating cover plate 120 and pushes the rotating cover plate 120 to cut the connecting pin 160 and rotate to a horizontal state, thereby blocking the central flow channel 101 and connecting the central flow channel 101 with the drive flow channel 102.

[0061] The fluid then drives the flow channel 102 into the pressure chamber 103 and acts on the expansion cone 130. The expansion cone 130 moves axially and expands radially under the action of the third inclined surface. At the same time, the expansion cone 130 pushes the slip 210 to expand, thus anchoring the slip 210. At this time, the positioning groove 211 disengages from the positioning protrusion, allowing the slip 210 to move axially. Finally, the insertion tool 100 is pressed down to push the cylinder 220, causing the slip 210 to expand further to strengthen the anchoring. Simultaneously, the insertion tool 100 is rotated to reverse and separate the insertion tool 100 from the cylinder 220, thereby removing the insertion tool 100 for subsequent operations.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tailpipe suspension system, characterized in that, The device includes a feeding tool (100), which comprises a body (110), a rotating cover plate (120), and an expansion cone (130). The body (110) has a central flow channel (101) and a driving flow channel (102) extending along its own axis. The rotating cover plate (120) is hinged to the body (110) and disposed within the central flow channel (101). The rotating cover plate (120) rotates to block the central flow channel (101), thereby allowing fluid to enter the driving flow channel (102) to push the expansion cone (130).

2. The tailpipe suspension system according to claim 1, characterized in that, The feeding tool (100) further includes a drive sleeve (140), which is inserted into the central flow channel (101); In the initial state, the drive sleeve (140) blocks the drive flow channel (102); The drive sleeve (140) can move along the central flow channel (101) to connect the central flow channel (101) and the drive flow channel (102); at the same time, the drive sleeve (140) pushes the rotating cover plate (120) to rotate so that the rotating cover plate (120) blocks the central flow channel (101), thereby allowing fluid to enter the drive flow channel (102) from the central flow channel (101).

3. The tailpipe suspension system according to claim 2, characterized in that, The feeding tool (100) also includes a first shearing pin (150), which is simultaneously inserted into the body (110) and the drive sleeve (140); Fluid pressure is applied to the end of the drive sleeve (140) away from the rotating cover plate (120) to cause the drive sleeve (140) to cut the first shear pin (150) and push the rotating cover plate (120) to rotate.

4. The tailpipe suspension system according to claim 3, characterized in that, The feeding tool (100) also includes a connecting pin (160), which is inserted into the body (110) and connected to the rotating cover plate (120) so that the central flow channel (101) remains open; When the drive sleeve (140) pushes the rotating cover plate (120), the connecting pin (160) is sheared off.

5. The tailpipe suspension system according to claim 4, characterized in that, The feeding tool (100) further includes a connecting sleeve (170), which is fitted onto the body (110) and the expansion cone (130); the connecting sleeve (170), the body (110), and the expansion cone (130) form a pressure chamber (103), which is connected to the driving flow channel (102), and fluid enters the pressure chamber (103) to push the expansion cone (130) to move.

6. The tailpipe suspension system according to claim 2, characterized in that, One end of the rotating cover plate (120) is hinged to the body (110), and the other end is provided with a first inclined surface; The drive sleeve (140) has a second inclined surface at one end near the rotating cover plate (120); The first inclined surface and the second inclined surface cooperate with each other to make the drive sleeve (140) push the rotating cover (120) to rotate.

7. The tailpipe suspension system according to claim 1, characterized in that, The expansion cone (130) is fitted onto the body (110), and a third inclined surface is provided on the outer side of the body (110); As the fluid propels the expansion cone (130) to move, the third inclined surface guides the expansion cone (130) to expand radially.

8. The tailpipe suspension system according to claim 1, characterized in that, It also includes a hanger tool (200), into which the feeding tool (100) is inserted; The hanging tool (200) includes a slip (210), the inner wall of which is provided with an expansion groove, and the expansion cone (130) is provided with an expansion protrusion; The expansion protrusion can engage with the expansion groove to cause the expansion cone (130) to push the slip (210) to expand radially.

9. The tailpipe suspension system according to claim 8, characterized in that, The hanging tool (200) also includes a cylindrical body (220), on which a positioning protrusion is provided, and the inner wall of the slip (210) is provided with a positioning groove (211); In the initial state, the positioning protrusion engages with the positioning groove (211) to fix the latch (210).

10. The tailpipe suspension system according to claim 9, characterized in that, The cylinder (220) is provided with a limiting protrusion, and the slip (210) is provided with a limiting groove (212); The limiting protrusion is inserted into the limiting groove (212) and can slide along the limiting groove (212) to limit the axial movement distance of the slip (210).

Images