Sand control device for liner hanger

Abstract

The application provides a back-connection cylinder sand prevention device for a tailpipe hanger, which comprises a sand prevention cap internally configured as a hollow, a back-connection cylinder sleeved on the outer wall of the sand prevention cap, and a lifting nipple passing through the interior of the sand prevention cap and extending into the back-connection cylinder, the outer wall of the sand prevention cap is connected with the inner wall of the back-connection cylinder through a fixing member, and the external surface of the lifting nipple is connected with a back-off up joint which can move towards the sand prevention cap to abut against the internal surface of the sand prevention cap and cut the fixing member. The back-connection cylinder sand prevention device for the tailpipe hanger can prevent the lifting nipple from driving the sand prevention cap to ascend in advance under the action of torque when the back-connection cylinder is inspected after the hanger is hung in a high-inclination well or a horizontal well, avoid the internal part of the back-connection cylinder from being filled with sand and blocking the gap between the sealing core and the back-connection cylinder, and further ensure that the central pipe can be smoothly pulled out after well completion.

Description

Technical Field

[0001] This invention relates to the field of cementing tools for oil and gas wells, and more specifically, to a sand-prevention device for a tailpipe hanger with a return sleeve. Background Technology

[0002] The sand control device for the tailpipe hanger is an important tool used in cementing. Its main body typically connects the return sleeve and the sand control cap at the upper end. During the lowering of the sand control device, the locking ring is fixed to the lifting sub by a set screw, and the locking ring is pressed against the sand control cap. After the hanger is set, during the backlash test by lifting the lifting sub, the sand control cap forms a metal-to-metal contact seal with the return sleeve due to its own weight. The lifting sub, under torque, can easily pull the sand control cap upwards, causing sand to enter and accumulate inside the return sleeve, clogging the gap between the sealing core and the return sleeve. This leads to difficulty in pulling out the center tube after cementing, and may even cause the center tube to jam. This in-well risk is particularly prominent in highly deviated and horizontal wells. Summary of the Invention

[0003] One objective of this invention is to provide a sand-proof device for a tailpipe hanger, which can prevent the sand-proof cap from rising prematurely under the action of torque when the short section is pulled up during the inspection of backing in highly deviated and horizontal wells. This avoids sand accumulation inside the backing tube and blockage of the gap between the sealing core and the backing tube, thereby ensuring that the center tube can be smoothly pulled out after cementing is completed.

[0004] According to the present invention, a sand-proof device for a tailpipe hanger is provided, comprising: a sand-proof cap with an internally hollow structure, a reconnection sleeve fitted on the outer wall of the sand-proof cap, and a lifting short section passing through the interior of the sand-proof cap and extending into the reconnection sleeve. The outer wall of the sand-proof cap is connected to the inner wall of the reconnection sleeve by a fixing member, and the inverted upper connector connected to the outer surface of the lifting short section is movable toward the sand-proof cap to press against the inner surface of the sand-proof cap and cut off the fixing member.

[0005] In a preferred embodiment, the outer wall of the sandproof cap is sealed to the inner wall of the return cylinder by a first sealing ring, and the outer wall of the lifting section is sealed to the inner wall of the sandproof cap by a second sealing ring.

[0006] In a preferred embodiment, the outer wall of the lifting section has a notch, and the inner wall of the sandproof cap has a sealing ring groove. The second sealing ring is preset in the notch. When the lifting section is inserted into the return cylinder, the second sealing ring can enter the sealing ring groove when the notch passes through the sealing ring groove.

[0007] In a preferred embodiment, the notch is provided on the segment above the overlocked connector.

[0008] In a preferred embodiment, the interior of the sand cap has a stop wall extending radially outward from its hollow space, and the inverted upper connector is movable toward the sand cap and presses against the stop wall.

[0009] In a preferred embodiment, the outer wall of the lifting section is perpendicular to the stop wall.

[0010] In a preferred embodiment, the fastener is a scissor pin.

[0011] In a preferred embodiment, a plurality of the fasteners are evenly arranged along the bottom outer wall of the sandproof cap.

[0012] In a preferred embodiment, the tailpipe hanger reconnector sand-proof device further includes: a locking ring fitted on the outer wall of the lifting sub, wherein the locking ring has multiple through holes, and a set screw is disposed in the through holes to lock and fix the locking ring to the lifting sub.

[0013] In a preferred embodiment, the locking ring is in abutting contact with the upper surface of the sand cap.

[0014] This invention has at least the following technical effects:

[0015] According to the present invention, a hollow sand-proof cap, a return sleeve fitted over the outer wall of the sand-proof cap, and a lifting sub that passes through the interior of the sand-proof cap and extends into the return sleeve are provided. Since the outer wall of the sand-proof cap and the inner wall of the return sleeve are connected by a fastener, and the overlocked connector connected to the outer surface of the lifting sub can move towards the sand-proof cap to press against the inner surface of the sand-proof cap and shear the fastener, it can prevent the lifting sub from prematurely moving the sand-proof cap under torque during the inspection of the overlock in highly deviated and horizontal wells. This avoids sand entering the interior of the return sleeve and clogging the gap between the sealing core and the return sleeve, thus ensuring that the center tube can be smoothly pulled out after well completion.

[0016] According to the present invention, the bottom outer wall of the sand-proof cap is sealed to the inner wall of the return sleeve by a first sealing ring, and the outer wall of the lifting sub is sealed to the inner wall of the sand-proof cap by a second sealing ring. Before transportation to the well site, the lifting sub can be connected to the return sleeve in the workshop, oil can be injected into the return sleeve, the sand-proof cap can be installed, and it can be fixed by fasteners. After connecting the locking ring and setting the set screw, the pressure transmission hole on the sand-proof cap can be sealed by the sealing screw. Since the sand-proof cap and the return sleeve are sealed by the first sealing ring and the lifting sub is sealed to the sand-proof cap by the second sealing ring, it is possible to prevent the grease in the return sleeve from flowing out during transportation, while saving a lot of assembly and preparation time and reducing the risk of casing adhesion and jamming.

[0017] In addition, since the sand cap and the return sleeve are sealed by the first sealing ring, and the outer wall of the lifting short section and the inner wall of the sand cap are sealed by the second sealing ring, the return sleeve can be completely sealed. This can further prevent sand from entering the return sleeve and blocking the gap between the sealing core and the return sleeve during the casing insertion process. Attached Figure Description

[0018] Figure 1 A three-dimensional structural schematic diagram of the sand-proof device for the tailpipe hanger according to the present invention is shown.

[0019] Figure 2 A schematic cross-sectional view of the sand-proof device for the tailpipe hanger according to the present invention is shown.

[0020] In this application, all drawings are schematic and are used only to illustrate the principles of the invention, and are not drawn to scale. Detailed Implementation

[0021] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be understood that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In this invention, "a plurality of" refers to two or more.

[0023] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] like Figures 1 to 2As shown, the tailpipe hanger reconnector sand-proof device of the present invention includes: a sand-proof cap 2 with a hollow interior, a reconnector 1 fitted onto the bottom outer wall of the sand-proof cap 2, and a lifting section 4 extending through the interior of the sand-proof cap 2 and into the reconnector 1. The main body of the tailpipe hanger reconnector sand-proof device (not shown in the figure) is connected to the lower part of the reconnector 1. The bottom outer wall of the sand-proof cap 2 is connected to the inner wall of the reconnector 1 by a fixing member 8. The outer surface of the section of the lifting section 4 extending into the reconnector 1 is connected to an inverted upper connector 11. During the lifting process of the lifting section 4, the inverted upper connector 11 moves towards the sand-proof cap 2 so as to press against the inner surface of the sand-proof cap 2, and pushes the sand-proof cap 2 with an upward force so that there is a tendency for relative movement between the sand-proof cap 2 and the reconnector 1, thereby shearing off the fixing member 8. Optionally, the fixing member 8 is a shear pin. A shear pin passes through the reconnector 1 and is driven into the sand cap 2 to secure the reconnector 1 to the sand cap 2. Optionally, the inverted upper connector 11 is threaded to the outer surface of the lower end of the lifting section 4.

[0025] According to the present invention, a hollow sand-proof cap 2, a return sleeve 1 fitted onto the outer wall of the sand-proof cap 2, and a lifting section 4 passing through the interior of the sand-proof cap 2 and extending into the return sleeve 1 are provided. Since the outer wall of the sand-proof cap 2 is connected to the inner wall of the return sleeve 1 by a fixing member 8, and the outer surface of the lifting section 4 is provided with a connected undercut connector 11 that can move towards the sand-proof cap 2 to press against the inner surface of the sand-proof cap 2 and shear the fixing member 8, it can prevent the lifting section 4 from prematurely moving the sand-proof cap 2 under torque during undercut inspection in highly deviated and horizontal wells. This avoids sand entering the interior of the return sleeve 1 and clogging the gap between the sealing core and the return sleeve, thus ensuring that the center tube can be smoothly pulled out after well completion.

[0026] In one or more embodiments, the bottom outer wall of the sandproof cap 2 is sealed to the inner wall of the return cylinder 1 by a first sealing ring 9, and the outer wall of the lifting section 4 is sealed to the inner wall of the sandproof cap 2 by a second sealing ring 6.

[0027] In existing technologies, the return sleeve, lifting sub, and sandproof cap are separate from the hanger body. They need to be transported to the well site for on-site assembly and then hoisted onto the drilling rig. After assembly, the sandproof cap is opened and oil is poured into the return sleeve. The whole process wastes a lot of preparation time and can easily cause the downhole casing to remain stationary for a long time, increasing the risk of casing adhesion and jamming.

[0028] According to the present invention, the bottom outer wall of the sand cap 2 is sealed to the inner wall of the return sleeve 1 by a first sealing ring 9, and the outer wall of the lifting sub 4 is sealed to the inner wall of the sand cap 2 by a second sealing ring 6. Before transportation to the well site, the lifting sub 4 can be connected to the return sleeve 1 in the workshop and oil can be injected into the return sleeve 1. Then, the sand cap 2 is installed and fixed by the fastener 8. After connecting the locking ring and setting the set screw, the pressure transmission hole 7 on the sand cap 2 can be sealed by the sealing screw (not shown in the figure). Since the sand cap 2 and the return sleeve 1 are sealed by the first sealing ring 6 and the lifting sub 4 and the sand cap 2 are sealed by the second sealing ring 6, it is possible to prevent the grease in the return sleeve 1 from flowing out during transportation, while saving a lot of assembly and preparation time and reducing the risk of casing adhesion and jamming.

[0029] In addition, since the sand cap 2 and the return sleeve 1 are sealed by the first sealing ring 9, and the outer wall of the lifting short section 4 and the inner wall of the sand cap 2 are sealed by the second sealing ring 6, the return sleeve 1 can be completely sealed. This can further prevent sand from accumulating inside the return sleeve 1 and blocking the gap between the sealing core and the return sleeve during the casing insertion process.

[0030] In one or more embodiments, the outer wall of the lifting section 4 is provided with a notch 10, the inner wall of the sand cap 2 is provided with a sealing ring groove, and the second sealing ring 6 is preset in the notch 10. During the process of inserting the lifting section 4 into the return tube 1, when the lifting section 4 moves downward and the notch 10 passes through the sealing ring groove, the second sealing ring 6 can extend and enter the sealing ring groove by its own elastic force.

[0031] In one or more embodiments, the notch 10 is provided on the segment above the overturned connector 11.

[0032] In one or more embodiments, the interior of the sand cap 2 has a stop wall 21 perpendicular to the lifting section 4, and the upside-down connector 11 can move toward the sand cap 2 and press against the stop wall 21.

[0033] In one or more embodiments, a plurality of fasteners 8 are evenly arranged along the bottom outer wall of the sandproof cap 2.

[0034] In one or more embodiments, the tailpipe hanger reconnector sand prevention device of the present invention further includes: a locking ring 3 fitted on the outer wall of the lifting short section 4, the locking ring 3 having a plurality of through holes, and a set screw 5 being disposed in the through holes to lock and fix the locking ring 3 to the lifting short section 4.

[0035] In one or more embodiments, the locking ring 3 is in abutting contact with the upper surface of the sand cap 2.

[0036] Although the invention has been described with reference to preferred embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A sand-proof device for a tailpipe hanger reconnection sleeve, comprising: The device comprises a hollow sand cap, a reconnecting cylinder fitted onto the outer wall of the sand cap, and a lifting section extending through the interior of the sand cap and into the reconnecting cylinder. The outer wall of the sand cap is connected to the inner wall of the reconnecting cylinder by a fastener, and the inverted upper connector connected to the outer surface of the lifting section can move toward the sand cap to press against the inner surface of the sand cap and cut off the fastener. The outer wall of the lifting section is sealed to the inner wall of the sand cap by a second sealing ring. The outer wall of the lifting section has a notch, and the inner wall of the sand cap has a sealing ring groove. The second sealing ring is pre-set in the notch. During the process of the lifting section penetrating the reconnecting cylinder, when the notch passes through the sealing ring groove, the second sealing ring can enter the sealing ring groove.

2. The tailpipe hanger return sleeve sand prevention device according to claim 1, characterized in that, The outer wall of the sandproof cap is sealed to the inner wall of the return cylinder by a first sealing ring.

3. The tailpipe hanger return sleeve sand prevention device according to claim 2, characterized in that, The notch is located on the segment above the inverted upper joint.

4. The tailpipe hanger reconnector sand-proof device according to claim 1 or 2, characterized in that, The sand cap has a stop wall extending radially outward from its hollow space, and the inverted upper connector can move toward the sand cap and press against the stop wall.

5. The tailpipe hanger return sleeve sand prevention device according to claim 4, characterized in that, The outer wall of the lifting section is perpendicular to the stop wall.

6. The tailpipe hanger reconnector sand-proof device according to claim 1 or 2, characterized in that, The fastener is a shear pin.

7. The tailpipe hanger return sleeve sand prevention device according to claim 6, characterized in that, Multiple fasteners are evenly arranged along the bottom outer wall of the sandproof cap.

8. The tailpipe hanger reconnector sand-proof device according to claim 1 or 2, characterized in that, Also includes: A locking ring is fitted onto the outer wall of the lifting section. The locking ring has multiple through holes on its ring body. A set screw is disposed in the through holes and locks the locking ring and the lifting section together.

9. The tailpipe hanger return sleeve sand prevention device according to claim 8, characterized in that, The locking ring makes contact with the upper surface of the sandproof cap.

Images