Drilling liner hanger assembly

Abstract

The utility model discloses a drilling liner hanger assembly which comprises a drilling liner hanger, a drilling liner packer and a connecting pipe, the drilling liner hanger and the drilling liner packer are arranged on the connecting pipe in a sleeved mode, the drilling liner packer is an elastic drilling liner packer, the drilling liner packer comprises a packer body, the packer body comprises convex portions and concave portions, and the convex portions and the concave portions are arranged alternately. The adjacent convex parts and concave parts are smoothly connected, after expansion occurs, the convex degree of the convex parts is gradually weakened, meanwhile, the circumferential size of the packer is increased, the concave degree of the concave parts is gradually weakened, and meanwhile, the circumferential size of the packer is increased. After the packer expands, the corrugated packer can be gradually converted into the annular packer, the outer diameter of the packer can be obviously increased due to the change of the shape, and therefore the packer has the large expansion rate. Due to the fact that the expansion rate of the packer is large, effective sealing can be rapidly formed between the packer and the inner wall of the casing pipe in actual operation, and therefore operation efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of oil drilling, in particular to a tail pipe hanger assembly. Background Art

[0002] The liner hanger assembly mainly includes a liner hanger, a liner packer and a connecting pipe. The liner hanger and the liner packer are both sleeved on the outside of the connecting pipe. The liner hanger is used to hang the liner on the inner wall of the casing. The liner packer is used to fit tightly with the inner wall of the casing to form a seal. The connecting pipe is used to fit the liner hanger and the liner packer on one hand, and to connect with the liner on the other hand. In the process of oil drilling, according to actual construction needs, the liner will be hung inside the existing casing in the wellbore through the liner hanger.

[0003] The sealing principle of the liner packer is that the elastic material of the liner packer expands, the outer diameter increases, and thus it fits tightly with the inner wall of the casing to form a sealing seal. However, the downhole environment is complex, and the expansion rate of the liner packer is generally low, so it cannot quickly form an effective seal, thus affecting the operation efficiency.

[0004] Therefore, how to increase the expansion rate of the tail pipe packer so as to quickly form an effective seal and improve operating efficiency is a key issue that needs to be urgently solved by technical personnel in this field. Utility Model Content

[0005] In view of this, the purpose of the utility model is to increase the expansion rate of the tail pipe packer, so as to quickly form an effective seal and improve the operating efficiency.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A tail pipe hanger assembly includes a tail pipe hanger, a tail pipe packer and a connecting pipe, wherein the tail pipe hanger and the tail pipe packer are sleeved on the connecting pipe, and the connecting pipe is detachably connected to the tail pipe. The tail pipe packer is an elastic tail pipe packer, and the tail pipe packer includes a packer, which includes alternately arranged convex parts and concave parts, and adjacent convex parts are smoothly connected. After expansion occurs, the protrusion of the convex part gradually weakens, and the circumferential size of the packer is increased, and the depression of the concave part gradually weakens, and the circumferential size of the packer is increased.

[0008] Preferably, a sealing groove is provided on the surface of the inner wall of the casing facing the packer, the part of the sealing groove on the convex part is a convex curved groove matching the convex curve of the convex part, and the part of the sealing groove on the concave part is a concave curved groove matching the concave curve of the concave part, the convex curved groove and the concave curved groove are smoothly connected, and after expansion occurs, the convex curved groove changes with the convex part, and the concave curved groove changes with the concave part.

[0009] Preferably, the tail pipe hanger includes a plurality of cava columns arranged around the connecting pipe, the plurality of cava columns are arranged at intervals, and the cava columns extend along the axial direction of the connecting pipe; the tail pipe packer also includes a plurality of fingers arranged around the connecting pipe, the fingers extend along the axial direction of the connecting pipe, each of the fingers is located between two adjacent cava columns, and the fingers are connected to the packer.

[0010] Preferably, the protrusions protrude toward the liner hanger, and a top of each protrusion is connected to one of the fingers.

[0011] Preferably, the slip column is formed by a plurality of first slips arranged along the axial direction of the connecting tube; and the finger-shaped object is formed by a plurality of second slips arranged along the axial direction of the connecting tube.

[0012] Preferably, the connecting pipe is divided into a first part, a third part and a second part from top to bottom, the tail pipe hanger is sleeved outside the first part, the expansion rate of the first part is greater than or equal to the expansion rate of the third part, and the expansion rate of the third part is greater than or equal to the expansion rate of the second part.

[0013] Preferably, the third part is welded to the lower end of the first part through a first weld, and the third part is welded to the upper end of the second part through a second weld.

[0014] Preferably, the material of the first part is stainless steel, the material of the second part is carbon steel, and the material of the third part is titanium alloy or composite nano.

[0015] It can be seen from the above technical solution that after the packer expands, the corrugated packer will gradually transform into a circular packer. This change in shape will significantly increase the outer diameter of the packer, so that the packer has a larger expansion rate. Due to the large expansion rate of the packer, in actual operations, the packer can quickly form an effective seal with the inner wall of the casing, thereby improving the operating efficiency.

[0016] In addition, the finger connected to the packer is located between two adjacent slip columns. Due to the constraint of the left and right slip columns, the finger remains motionless, and the packer connected to the finger will also be constrained and remain in the original position. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings described below are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of the tail pipe hanger assembly disclosed in the specific implementation of the utility model when it is in an unexpanded state;

[0019] Figure 2 It is a structural schematic diagram of the liner hanger assembly disclosed in the embodiment of the utility model when it is in an expanded state;

[0020] Figure 3 The utility model is a schematic structural diagram of a tail pipe packer disclosed in an embodiment of the utility model.

[0021] The names of the components are as follows:

[0022] 1-tail pipe hanger, 2-tail pipe packer, 3-upper end of tail pipe hanger, 4-lower end of tail pipe hanger, 5-slip column, 6-first slip, 7-packer, 8-finger, 9-sealing groove, 10-connecting pipe, 11-first part, 12-second part, 13-third part, 14-recess, 15-convex part, 16-second slip, 17-first weld, 18-second weld, 19-lower end of first part, 20-upper end of second part. DETAILED DESCRIPTION

[0023] In view of this, the core of the utility model is to increase the expansion rate of the tail pipe packer, so as to quickly form an effective seal and improve the operation efficiency.

[0024] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0025] Please refer to the attached Figure 1 -Attached Figure 3The utility model discloses a liner hanger assembly, which includes: a liner hanger 1, a liner packer 2 and a connecting pipe 10. The liner hanger 1 and the liner packer 2 are both sleeved on the connecting pipe 10, and the liner hanger 1 is located above the liner packer 2. The connecting pipe 10 is detachably connected to the liner. Specifically, the liner is threadedly connected to the lower end of the connecting pipe 10. The liner hanger 1 is used to be suspended on the inner wall of the casing.

[0026] The tail pipe packer 2 in the utility model is a tail pipe packer 2 made of elastic material. The tail pipe packer 2 includes a packer 7, and the packer 7 includes convex parts 15 and concave parts 14 arranged alternately. The adjacent convex parts 15 and concave parts 14 are smoothly connected to form a corrugated packer 7. After the packer 7 expands, the protrusion of the protrusion 15 gradually weakens, and the protrusion 15 moves in the opposite direction of the protrusion direction. At the same time, the two ends of the protrusion 15 gradually transform into the circumferential part of the packer 7, thereby increasing the circumferential size of the packer 7. The concave degree of the concave part 14 gradually weakens, and the concave part 14 moves in the opposite direction of the concave direction. At the same time, the two ends of the concave part 14 gradually transform into the circumferential part of the packer 7, thereby increasing the circumferential size of the packer 7. After the packer 7 expands, the corrugated packer 7 will gradually transform into a ring-shaped packer 7. After the transformation, the outer diameter of the packer 7 will become larger, so that it fits tightly with the inner wall of the casing to form an effective seal.

[0027] After the packer 7 expands, the corrugated packer 7 will gradually transform into a circular packer 7. This change in shape will significantly increase the outer diameter of the packer 7, so that the packer 7 has a larger expansion rate. Due to the large expansion rate of the packer 7, in actual operations, the packer 7 can quickly form an effective seal with the inner wall of the casing, thereby improving the operation efficiency.

[0028] A sealing groove 9 is also provided on the surface of the packer 7 facing the inner wall of the casing, that is, on the sealing surface of the packer 7, and a sealing ring is placed in the sealing groove 9. When the packer 7 does not expand, the packer 7 is corrugated. The sealing groove 9 on the sealing surface of the packer 7 is also corrugated. The portion of the sealing groove 9 on the convex portion 15 of the packer 7 is a convex curved groove, which matches the convex curve of the convex portion 15. The portion of the sealing groove 9 on the concave portion 14 is a concave curved groove, which matches the concave curve of the concave portion 14 of the packer 7. The convex curved groove and the concave curved groove are smoothly connected to form a corrugated sealing groove 9. After expansion occurs, the convex curved groove changes with the convex portion 15, that is, the protrusion of the convex curved groove gradually weakens, and the two ends of the convex curved groove gradually expand along the circumference of the packer 7. Similarly, the concave curved groove changes with the concave portion 14, that is, the concave degree of the concave curved groove gradually weakens, and the two ends of the concave curved groove gradually expand along the circumference of the packer 7. Finally, the corrugated sealing groove 9 changes into an annular sealing groove 9, the outer diameter of the annular sealing groove 9 is larger than the outer diameter of the corrugated sealing groove 9, and the sealing ring in the annular sealing groove 9 is in close contact with the inner wall of the casing. In addition, the sealing groove 9 is preferably set in the width direction of the sealing surface of the packer 7, or in the middle position of the axial direction of the connecting pipe 10.

[0029] The liner hanger 1 includes a plurality of slip columns 5 arranged around the connecting pipe 10, the plurality of slip columns 5 are arranged at intervals, and the slip columns 5 extend along the axial direction of the connecting pipe 10. The slip columns 5 mesh with the inner wall of the casing, thereby realizing the anchoring of the liner hanger 1 and the casing. Further, the slip columns 5 include a plurality of first slips, and the plurality of first slips are arranged along the axial direction of the connecting pipe 10. The slip columns 5 composed of the plurality of first slips can strengthen the meshing effect with the inner wall of the casing. The liner packer 2 also includes a plurality of fingers 8 arranged around the connecting pipe 10, the fingers 8 extend along the axial direction of the connecting pipe 10, and each finger 8 is located between two adjacent slip columns 5. The lower end of the finger 8 is connected to the packer 7. Further, each finger 8 is formed by a plurality of second slips 16 arranged along the axial direction of the connecting pipe 10. The finger 8 composed of the plurality of second slips 16 can strengthen the meshing effect with the inner wall of the casing.

[0030] In this embodiment, the finger 8 connected to the packer 7 is located between two adjacent slip columns 5. Due to the restraint of the left and right slip columns 5, the finger 8 remains stationary, so the packer 7 connected to the finger 8 will also be restrained and remain in the original position.

[0031] In a specific embodiment of the utility model, the convex portion 15 of the packer 7 protrudes toward the direction of the tail pipe hanger 1, or upward. The top of each convex portion 15 is connected to a finger 8. Since the packer 7 is annular, the number of convex portions 15 and the number of concave portions 14 are equal, and the multiple convex portions 15 are evenly spaced, then the multiple fingers 8 are also evenly spaced. Therefore, the packer 7 will be subject to uniform restraint force, thereby ensuring that the packer 7 expands evenly when expanding, and forms a circumferential and all-round seal with the inner wall of the casing.

[0032] The connecting pipe 10 is divided into a first part 11, a third part 13 and a second part 12 from top to bottom. The tail pipe hanger 1 is sleeved outside the first part 11. The expansion rate of the first part 11 is greater than or equal to the expansion rate of the third part 13, and the expansion rate of the third part 13 is greater than or equal to the expansion rate of the second part 12. That is, from top to bottom, the expansion rate of the connecting pipe 10 gradually decreases. Different parts of the connecting pipe 10 have different expansion rates, so the connecting pipe 10 can adapt to casings of various inner diameters.

[0033] The material of the first part 11 of the connecting pipe 10 is preferably stainless steel, which has a higher expansion rate. The material of the second part 12 is preferably carbon steel, which has a standard expansion rate. The material of the third part 13 is preferably titanium alloy or composite nano, which has an expansion rate slightly lower than or the same as that of the first part 11, and slightly higher than or the same as that of the second part 12.

[0034] The third portion 13 of the connecting pipe 10 is welded to the lower end of the first portion 11 by a first weld 17, and the third portion 13 is welded to the upper end of the second portion 12 by a second weld 18. This can avoid corrosion caused by direct connection between the first portion 11 and the third portion 13, and between the third portion 13 and the second portion 12, and can also improve welding quality and expansibility.

[0035] In the description of the present invention, it should be noted that the terms "upper", "lower", "top", "bottom", 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 application 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. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0036] Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" 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 or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0037] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be 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 present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A liner hanger assembly, comprising a liner hanger (1), a liner packer (2) and a connecting pipe (10), wherein the liner hanger (1) and the liner packer (2) are sleeved on the connecting pipe (10), and the connecting pipe (10) is detachably connected to the liner; It is characterized in that The tail tube packer (2) is an elastic tail tube packer (2), and the tail tube packer (2) includes a packer (7), and the packer (7) includes convex parts (15) and concave parts (14) arranged alternately, and the adjacent convex parts (15) and concave parts (14) are smoothly connected; after expansion occurs, the protrusion of the convex part (15) gradually weakens, and at the same time, the circumferential size of the packer (7) increases, and the depression of the concave part (14) gradually weakens, and at the same time, the circumferential size of the packer (7) increases.

2. The liner hanger assembly according to claim 1, characterized in that: A sealing groove (9) is provided on the surface of the seal (7) facing the inner wall of the casing, the portion of the sealing groove (9) on the convex portion (15) is a convex curved groove matching the convex curve of the convex portion (15), and the portion of the sealing groove (9) on the concave portion (14) is a concave curved groove matching the concave curve of the concave portion (14), the convex curved grooves and the concave curved grooves are smoothly connected, and after expansion occurs, the convex curved groove changes with the convex portion (15), and the concave curved groove changes with the concave portion (14).

3. The liner hanger assembly according to claim 2, characterized in that: The tail pipe hanger (1) includes a plurality of slip columns (5) arranged around the connecting pipe (10), the plurality of slip columns (5) are arranged at intervals, the slip columns (5) extend along the axial direction of the connecting pipe (10), and the surface of the slip columns (5) engages with the inner wall of the casing; the tail pipe packer (2) also includes a plurality of fingers (8) arranged around the connecting pipe (10), the fingers (8) extend along the axial direction of the connecting pipe (10), each of the fingers (8) is located between two adjacent slip columns (5), and the fingers (8) are connected to the packer (7).

4. The liner hanger assembly according to claim 3, characterized in that: The protrusions (15) protrude toward the tail pipe hanger (1), and the top of each protrusion (15) is connected to one of the fingers (8).

5. The liner hanger assembly according to claim 3, characterized in that: The slip column (5) is formed by a plurality of first slips (6) arranged along the axial direction of the connecting pipe (10); and the finger (8) is formed by a plurality of second slips (16) arranged along the axial direction of the connecting pipe (10).

6. The liner hanger assembly according to claim 1, characterized in that: The connecting pipe (10) is divided into a first part (11), a third part (13) and a second part (12) from top to bottom; the tail pipe hanger (1) is sleeved outside the first part (11); the expansion rate of the first part (11) is greater than or equal to the expansion rate of the third part (13); and the expansion rate of the third part (13) is greater than or equal to the expansion rate of the second part (12).

7. The liner hanger assembly according to claim 6, characterized in that: The third part (13) is welded to the lower end (19) of the first part (11) via a first weld (17), and the third part (13) is welded to the upper end (20) of the second part (12) via a second weld (18).

8. The liner hanger assembly according to claim 6, characterized in that: The material of the first part (11) is stainless steel, the material of the second part (12) is carbon steel, and the material of the third part (13) is titanium alloy or composite nano.

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