Tie-back barrel sand prevention device for drilling liner hanger

Abstract

The invention provides a tie-back barrel sand prevention device for a drilling liner hanger, which comprises a hollow sand prevention cap, a tie-back barrel arranged on the outer wall of the sand prevention cap in a sleeving manner, and a lifting short section penetrating through the interior of the sand prevention cap and extending into the tie-back barrel, and the outer wall of the sand prevention cap is connected with the inner wall of the tie-back barrel through a fixing piece. And the upside-down upper connector connected with the outer surface of the lifting short section can move towards the sand prevention cap so as to be in abutting contact with the inner surface of the sand prevention cap, and the fixing piece is cut off. According to the tie-back barrel sand prevention device for the drilling liner hanger, the situation that in a highly-deviated well and a horizontal well, when the hanger is seated and hung and is subjected to back-off inspection, the lifting short section drives the sand prevention cap to move upwards in advance under the action of torque can be prevented, sand entering the tie-back barrel is prevented from being accumulated and blocking a gap between a sealing core and the tie-back barrel, and the service life of the tie-back barrel is prolonged. After well completion, it is guaranteed that the central pipe can be pulled out smoothly.

Description

Technical Field

[0001] The invention relates to the field of oil and gas well cementing tools, and in particular to a tie-back tube sand prevention device for a liner hanger. Background Art

[0002] The tie-back tube sand control device for the liner hanger is an important tool used in the cementing process. Its main body is usually connected to the tie-back tube and the sand control cap at the upper end. In the process of lowering the tie-back tube sand control device for the liner hanger, the locking ring is fixed to the lifting nipple by the top screw, and the locking ring is pressed on the sand control cap. After the sitting and hanging is completed, in the process of lifting the lifting nipple to check the undercut, the sand control cap forms a metal contact seal with the tie-back tube by its own weight. The lifting nipple is easy to drive the sand control cap upward under the action of torque, resulting in sand entering and accumulating inside the tie-back tube, blocking the gap between the sealing core and the tie-back tube, and then after the cementing is completed, it is difficult to pull out the center pipe, and even cause the center pipe to get stuck. This risk in the well is particularly prominent in highly deviated wells and horizontal wells. Summary of the invention

[0003] One purpose of the present invention is to provide a tie-back tube sand prevention device for a tail pipe hanger, so as to prevent, in highly deviated wells and horizontal wells, the pulling short joint from driving the sand prevention cap to move upward in advance under the action of torque when inspecting the undercut, thereby avoiding sand accumulation inside the tie-back tube and clogging the gap between the sealing core and the tie-back tube, and then ensuring that the center pipe can be pulled out smoothly after cementing is completed.

[0004] According to the present invention, there is provided a return tube sand control device for a tail pipe hanger, comprising: a sand control cap with a hollow interior, a return tube sleeved on the outer wall of the sand control cap, and a pulling short section passing through the interior of the sand control cap and extending into the return tube, wherein the outer wall of the sand control cap is connected to the inner wall of the return tube by a fixing piece, and the inverted upper joint connected to the outer surface of the pulling short section can move toward the sand control cap to press and contact with the inner surface of the sand control cap and shear off the fixing piece.

[0005] In a preferred embodiment, the outer wall of the sand control cap is sealed to the inner wall of the tie-back tube via a first sealing ring, and the outer wall of the lifting short section is sealed to the inner wall of the sand control cap via a second sealing ring.

[0006] In a preferred embodiment, a notch is provided on the outer wall of the lifting short section, a sealing ring groove is provided on the inner wall of the sand control cap, the second sealing ring is preset in the notch, and when the lifting short section is inserted into the return tube, the notch passes through the sealing ring groove, and the second sealing ring can enter the sealing ring groove.

[0007] In a preferred embodiment, the notch is provided in a segment above the undercut upper joint.

[0008] In a preferred embodiment, the interior of the sand control cap is provided with a stop wall extending radially outward from the hollow space thereof, and the inverted upper joint can move toward the sand control cap and come into pressure contact with the stop wall.

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

[0010] In a preferred embodiment, the fixing member is a shear nail.

[0011] In a preferred embodiment, a plurality of the fixing members are evenly arranged along the bottom outer wall of the sand control cap.

[0012] In a preferred embodiment, the tie-back tube sand control device for the tail pipe hanger also includes: a locking ring sleeved on the outer wall of the lifting short section, a plurality of through holes are provided on the ring body of the locking ring, and a top screw is provided in the through hole to lock and fix the locking ring and the lifting short section.

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

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

[0015] According to the present invention, a sand cap having a hollow interior, a tie-back tube sleeved on the outer wall of the sand cap, and a pull-up nipple passing through the interior of the sand cap and extending into the tie-back tube are provided. Since the outer wall of the sand cap is connected to the inner wall of the tie-back tube by a fixing piece, and the inverted upper joint connected to the outer surface of the pull-up nipple can move toward the sand cap to contact with the inner surface of the sand cap and cut the fixing piece, it is possible to prevent the pull-up nipple from driving the sand cap to move upward in advance under the action of torque when checking the inverted joint in a highly deviated well or a horizontal well, thereby preventing sand from entering the interior of the tie-back tube and blocking the gap between the sealing core and the tie-back tube, thereby ensuring that the central pipe can be pulled out smoothly after the well is completed.

[0016] According to the present invention, the bottom outer wall of the sand cap is sealed and connected to the inner wall of the return tube by a first sealing ring, and the outer wall of the lifting nipple is sealed and connected to the inner wall of the sand cap by a second sealing ring. Before being transported to the well site, the lifting nipple can be connected to the return tube in the workshop and oil can be poured into the return tube. Then the sand cap can be installed and fixed by a fixing member. After the locking ring is connected and the top screw is set, the pressure transmission hole on the sand cap can be sealed by a sealing screw. Since the sand cap and the return tube are sealed by the first sealing ring and the lifting nipple and the sand cap are sealed by the second sealing ring, it is possible to prevent the grease in the return tube 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 control cap and the return tube are sealed by the first sealing ring, and the outer wall of the pulling short section and the inner wall of the sand control cap are sealed by the second sealing ring, the return tube as a whole can be completely sealed, thereby further preventing sand from entering the interior of the return tube and clogging the gap between the sealing core and the return tube during the casing lowering process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The three-dimensional structure diagram of the tie-back tube sand control device for the liner hanger according to the present invention is schematically shown;

[0019] Figure 2 The cross-sectional structure diagram of the tie-back tube sand control device for the liner hanger according to the present invention is schematically shown.

[0020] In the present application, all drawings are schematic drawings, which are only used to illustrate the principles of the present invention and are not drawn according to the actual scale. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present 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 drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In the present invention, "multiple" refers to two or more.

[0023] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] like Figure 1 to Figure 2As shown, the tie-back tube sand control device for the liner hanger of the present invention comprises: a sand control cap 2 having a hollow interior, a tie-back tube 1 sleeved on the bottom outer wall of the sand control cap 2, and a lifting nipple 4 passing through the interior of the sand control cap 2 and extending into the tie-back tube 1. The body of the tie-back tube sand control device for the liner hanger (not shown in the figure) is connected to the bottom of the tie-back tube 1, wherein the bottom outer wall of the sand control cap 2 is connected to the inner wall of the tie-back tube 1 by a fixing member 8, and an inverted upper joint 11 is connected to the outer surface of the segment of the lifting nipple 4 extending in the tie-back tube 1. During the process of lifting the lifting nipple 4, the inverted upper joint 11 moves toward the sand control cap 2 so as to be in contact with the inner surface of the sand control cap 2, and pushes the sand control cap 2 by the upward force so that there is a tendency of relative movement between the sand control cap 2 and the tie-back tube 1, thereby being able to cut the fixing member 8. Optionally, the fixing member 8 is a shear nail. The shear nails pass through the tie-back tube 1 and are driven into the sand control cap 2 to fix the tie-back tube 1 and the sand control cap 2. Optionally, the inverted upper joint 11 is connected to the outer surface of the lower end of the lifting short section 4 by threads.

[0025] According to the present invention, a sand cap 2 having a hollow interior, a tie-back tube 1 sleeved on the outer wall of the sand cap 2, and a pull-up nipple 4 passing through the interior of the sand cap 2 and extending into the tie-back tube 1 are provided. Since the outer wall of the sand cap 2 is connected to the inner wall of the tie-back tube 1 by a fixing member 8, and the outer surface of the pull-up nipple 4 is provided with a connected undercut upper joint 11 which can move toward the sand cap 2 to contact with the inner surface of the sand cap 2 and cut off the fixing member 8, it is possible to prevent the pull-up nipple 4 from driving the sand cap 2 to move upward in advance under the action of torque when checking undercuts in highly deviated wells and horizontal wells, thereby preventing sand from entering the interior of the tie-back tube 1 and blocking the gap between the sealing core and the tie-back tube, thereby ensuring that the central pipe can be pulled out smoothly after the well is completed.

[0026] In one or more embodiments, the bottom outer wall of the sand control cap 2 is sealed to the inner wall of the tie-back tube 1 via a first sealing ring 9 , and the outer wall of the lifting nipple 4 is sealed to the inner wall of the sand control cap 2 via a second sealing ring 6 .

[0027] In the prior art, the tie-back tube, lifting nipple and sand control cap are separated from the hanger body and need to be transported to the well site for on-site assembly and hoisted onto the drilling platform after assembly. Then, the sand control cap is opened and oil is filled into the tie-back tube. The whole process wastes a lot of preparation time and easily causes the downhole casing to be 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 and connected to the inner wall of the return tube 1 through the first sealing ring 9, and the outer wall of the lifting short section 4 is sealed and connected to the inner wall of the sand cap 2 through the second sealing ring 6. Before being transported to the well site, the lifting short section 4 can be connected to the return tube 1 in the workshop and oil can be poured into the return tube 1, and then the sand cap 2 can be installed and fixed by the fixing member 8. After the locking ring is connected and the top screw is set, the pressure transmission hole 7 on the sand cap 2 can be blocked by a sealing screw (not shown in the figure). Since the sand cap 2 and the return tube 1 are sealed by the first sealing ring 6 and the lifting short section 4 and the sand cap 2 are sealed by the second sealing ring 6, it is possible to prevent the grease in the return tube 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-proof cap 2 and the return tube 1 are sealed by the first sealing ring 9, and the outer wall of the pulling short section 4 and the inner wall of the sand-proof cap 2 are sealed by the second sealing ring 6, the return tube 1 as a whole can be completely sealed, thereby further preventing sand from accumulating inside the return tube 1 and clogging the gap between the sealing core and the return tube during the casing lowering process.

[0030] In one or more embodiments, a notch 10 is provided on the outer wall of the lifting short section 4, a sealing ring groove is provided on the inner wall of the sand control cap 2, and the second sealing ring 6 is preset in the notch 10. When the lifting short section 4 is inserted into the return tube 1, the lifting short section 4 moves downward and the notch 10 passes through the sealing ring groove, the second sealing ring 6 can stretch and enter the sealing ring groove through its own elastic force.

[0031] In one or more embodiments, the notch 10 is disposed in a segment above the undercut upper joint 11 .

[0032] In one or more embodiments, the interior of the sand control cap 2 has a stop wall 21 perpendicular to the lifting nipple 4 , and the inverted upper joint 11 can move toward the sand control cap 2 and come into contact with the stop wall 21 .

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

[0034] In one or more embodiments, the tie-back tube sand control device for the tail pipe hanger described in the present invention also includes: a locking ring 3 sleeved on the outer wall of the lifting short section 4, a plurality of through holes are arranged on the ring body of the locking ring 3, and a top screw 5 is arranged in the through hole to lock and fix the locking ring 3 and the lifting short section 4.

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

[0036] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present 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 tie-back tube sand control device for a liner hanger, comprising: The interior is constructed as a hollow sand-proof cap, a return tube which is sleeved on the outer wall of the sand-proof cap, and a pulling short section which passes through the interior of the sand-proof cap and extends into the return tube. The outer wall of the sand-proof cap is connected to the inner wall of the return tube by a fixing piece, and the inverted upper joint connected to the outer surface of the pulling short section can move toward the sand-proof cap to press against the inner surface of the sand-proof cap and shear off the fixing piece.

2. The tie-back tube sand control device for a liner hanger according to claim 1, characterized in that: The outer wall of the sand control cap is sealed and connected to the inner wall of the tie-back cylinder via a first sealing ring, and the outer wall of the lifting short section is sealed and connected to the inner wall of the sand control cap via a second sealing ring.

3. The tie-back tube sand control device for a liner hanger according to claim 2, characterized in that: A notch is provided on the outer wall of the lifting short section, a sealing ring groove is provided on the inner wall of the sand control cap, the second sealing ring is preset in the notch, and when the lifting short section penetrates into the return tube, the notch passes through the sealing ring groove, and the second sealing ring can enter the sealing ring groove.

4. The tie-back tube sand control device for a liner hanger according to claim 3, characterized in that: The notch is arranged in a section above the undercut upper joint.

5. The tie-back tube sand control device for a liner hanger according to claim 1 or 2, characterized in that: The interior of the sand control cap is provided with a stop wall extending radially outward from the hollow space thereof, and the inverted upper joint can move toward the sand control cap and come into contact with the stop wall.

6. The tie-back tube sand control device for a liner hanger according to claim 5, characterized in that: The outer wall of the lifting short section is perpendicular to the stop wall.

7. The tie-back tube sand control device for a liner hanger according to claim 1 or 2, characterized in that: The fixing piece is a shear nail.

8. The tie-back tube sand control device for a liner hanger according to claim 7, characterized in that: A plurality of the fixing members are evenly arranged along the bottom outer wall of the sand control cap.

9. The tie-back tube sand control device for a liner hanger according to claim 1 or 2, characterized in that: Also includes: A locking ring is sleeved on the outer wall of the lifting short section, and a plurality of through holes are arranged on the ring body of the locking ring. Top screws are arranged in the through holes to lock and fix the locking ring and the lifting short section.

10. The tie-back tube sand control device for a liner hanger according to claim 9, characterized in that: The locking ring is in pressing contact with the upper surface of the sand control cap.

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