CN219622665U

CN219622665U - Underground long drill Kong Shuili fracturing expansion type wear-resistant packer

Info

Publication number: CN219622665U
Application number: CN202321264304.XU
Authority: CN
Inventors: 李刚; 魏展航; 梁少剑; 刘美乐; 马国伟; 重阳
Original assignee: Weinan Shaanxi Coal Qichen Technology Co ltd
Current assignee: Weinan Shaanxi Coal Qichen Technology Co ltd
Priority date: 2023-05-23
Filing date: 2023-05-23
Publication date: 2023-09-01
Anticipated expiration: 2033-05-23

Abstract

The utility model provides an underground long drill Kong Shuili fracturing expansion type wear-resistant packer which comprises a rubber cylinder arranged on the outer side of a central tube, and capsule shoulder pads respectively arranged at two ends of the rubber cylinder, wherein each capsule shoulder pad comprises a fixing part and a rubber protection part, one side of each fixing part is connected with the central tube, a fixing hole is formed in each fixing part, one side of each rubber protection part extends into each fixing hole to be connected with each fixing part, the other side of each rubber protection part extends out of each fixing part, and the inner wall of each rubber protection part is in contact with the outer wall of the corresponding rubber cylinder. According to the utility model, the capsule shoulder pad is designed, so that the rubber cylinder is prevented from being directly contacted with the sealing connecting piece, and the sealing connecting piece has the characteristics of good sealing property, high pressure resistance, wear resistance and repeated use for long drilling holes of a coal (rock) layer.

Description

Underground long drill Kong Shuili fracturing expansion type wear-resistant packer

Technical Field

The utility model belongs to the technical field of underground coal mine tools, and particularly relates to an underground long drill Kong Shuili fracturing expansion type wear-resistant packer.

Background

Along with the regionalization and advanced treatment of mine disasters, the directional long-borehole hydraulic fracturing measures under the coal mine are gradually accepted and applied on a large scale. In the long-bore fracturing engineering, an expansion type packer is mostly adopted at present, and the bearing capacity of the packer is completely determined by the structure of the packer and the material of a rubber cylinder, so that the rubber cylinder expands outwards when high-pressure water is injected into the rubber cylinder, and sealing is realized. The method has the characteristics of strong pressure resistance, simple process and the like, and is widely used. However, because the fracturing fluid pressure of the long drilling hole is large, the displacement is large, the packer is pressed and expanded, and the packer is released and contracted, so that the packer is often required to bear large pressure and is repeatedly used, the positions of the rubber cylinder and the connector are usually provided with metal shoulder pads, and the rubber cylinder is extremely easy to break in the using process due to the lack of buffer protection, so that the process flow and the cost are increased.

Disclosure of Invention

In order to solve the problems in the prior art, the utility model provides the underground long drill Kong Shuili fracturing expansion type wear-resistant packer, and the capsule shoulder pad is designed to prevent the rubber sleeve from being directly contacted with the sealing connecting piece, so that the packer has the characteristics of good sealing property, high pressure resistance, wear resistance and repeated use for long drilling holes of a coal (rock) layer.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a wear-resisting packer of long brill Kong Shuili fracturing expansion formula in pit, including setting up the packing element in the center tube outside, set up the capsule shoulder pad at the packing element both ends respectively, the capsule shoulder pad includes fixed part and rubber protection portion, fixed part one side is connected with the center tube, sets up the fixed orifices in the fixed part, and rubber protection portion one side stretches into the fixed orifices and is connected with the fixed part, and rubber protection portion opposite side extends the fixed part, rubber protection portion inner wall and packing element outer wall contact.

Further, threads are arranged on one side of the fixing part and are used for being in threaded connection with the central pipe.

Further, the rubber protection part is made of a rubber expansion material.

Further, the rubber expansion material is nitrile butadiene rubber NBR or hydrogenated nitrile butadiene rubber HNBR.

Further, one side of the rubber protection part extends into the fixing hole to be connected with the fixing part in a die-casting mode.

Further, a water inlet is formed in the central tube and is close to the rubber cylinder.

Further, sealing connecting pieces are arranged at two ends of the central tube, and the capsule shoulder pads at two ends of the rubber cylinder are fixed on the central tube through one ends of the sealing connecting pieces.

Further, the other ends of the two sealing connecting pieces are respectively connected with an upper joint and a lower joint, and the upper joint and the lower joint are used for being connected with a drill rod.

Further, the upper joint, the lower joint, the sealing connecting piece and the central tube are all in threaded connection, and sealing rings are arranged in the middle of the upper joint, the lower joint, the sealing connecting piece and the central tube.

Further, the fixing part is prepared from one of 42CrMo, 30CrMnSiA and 34CrNiMo 6.

Compared with the prior art, the utility model has at least the following beneficial effects:

the utility model provides an underground long drill Kong Shuili fracturing expansion type wear-resistant packer, which adopts a capsule shoulder pad, the structure of the shoulder pad can be flexibly disassembled and replaced, the weight of the packer is reduced as a whole by the structural design, the use is more convenient, the fixation of the capsule shoulder pad and a central tube is ensured by arranging a fixing part, when the rubber cylinder expands, the rubber cylinder expands and extrudes the capsule shoulder pad by arranging a rubber protecting part at the contact part with the rubber cylinder, the rubber protecting part can flexibly protect the rubber cylinder, the direct contact of the expansion of the rubber cylinder and a sealing connecting piece is avoided, and the problem of repeated utilization of the fracture packer setting of the long drill Kong Shuili is solved. The utility model has the characteristics of high expansion rate, high pressure resistance, good sealing performance and reusability for the long drilling seal of the coal (rock) layer.

Further, the rubber protection part is made of a rubber expansion material, and the rubber protection part has good expansion property, so that the rubber protection part can be tightly attached to the casing wall when the rubber cylinder is expanded, and the wear resistance and stability of the rubber cylinder can be effectively protected.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

Fig. 2 is a schematic view of a capsule shoulder pad.

In the figure: 1-upper joint; 11-a fixing part; 12-a rubber guard; 2-sealing the connector; 3-capsule shoulder pad; 4-a rubber cylinder; 5-a central tube; 6-a water inlet; 7-lower joint.

Detailed Description

The utility model is further described below with reference to the drawings and the detailed description.

As shown in fig. 1, the present utility model discloses a long-drilling expansion type wear-resistant packer, which comprises: the upper joint 1, sealing connection piece 2, capsule shoulder pad 3, packing element 4, center tube 5, water inlet 6 and lower clutch 7, packing element 4 are installed in the outside of center tube 5, and packing element 4 symmetry is fixed in center tube 5 both sides, and packing element 4 both ends set up capsule shoulder pad 3, and capsule shoulder pad 3 passes through sealing connection piece 2 one end to be fixed on center tube 5, and open on center tube 5 has water inlet 6 to be used for leading to water in to packing element 4 and make its inflation.

Preferably, the other end of the sealing joint 2 is used for fixing the upper joint 1 or the lower joint 7, and the packer can be directly connected with the drill rod through the upper joint 1 and the lower joint 7.

Preferably, the upper joint 1, the lower joint 7, the sealing connecting piece 2 and the central tube 5 are all in threaded connection, and sealing rings are arranged in the middle.

Preferably, the upper joint 1 is of an internal thread structure, and the lower joint is of an external thread structure 7, so that the upper joint can be conveniently connected with a drill rod.

Preferably, the water inlet 6 is arranged on one side of the central tube 5 close to the rubber cylinder 4, so that the quick expansion of the rubber cylinder can be quickened.

Preferably, as shown in fig. 2, the capsule shoulder pad 3 includes a fixing portion 11 and a rubber protecting portion 12, the fixing portion 11 is used for realizing threaded connection with the sealing connecting piece 2, a fixing hole is formed in the fixing portion 11, one side of the rubber protecting portion 12 extends into the fixing hole and is connected with the fixing portion 11 in a die-casting manner, the other side of the rubber protecting portion 12 extends out of the fixing portion 11, and the inner wall of the rubber protecting portion 12 is in contact with the outer wall of the rubber cylinder 4 for preventing the expansion of the rubber cylinder 4 and the direct contact of the sealing connecting piece 2.

Preferably, the fixing portion 11 is made of 42CrMo, 30CrMnSiA, 34CrNiMo6, or the like.

Preferably, the rubber guard 12 is made of a rubber swelling material, nitrile rubber NBR, hydrogenated nitrile rubber HNBR.

When the packer is set, high-pressure water enters the central tube 5 from the upper joint 1, and under the action of pressure difference, the high-pressure water enters the rubber tube 4, so that the rubber tube 4 is rapidly expanded, the capsule shoulder pad 3 is tightly attached to the sleeve wall, the expansion of the rubber tube 4 and the direct friction of the sealing connecting piece 2 are prevented, the stress concentration of the rubber tube 4 is caused, the rubber tube 4 is worn, and the wear resistance and the stability of the rubber tube can be effectively protected.

The utility model provides a long-drilling expansion type wear-resistant packer, which is characterized in that a rubber sleeve 4 is prevented from being directly contacted with a sealing connecting piece 2 by designing a capsule shoulder pad 3, so that the long-drilling expansion type wear-resistant packer has the characteristics of good sealing performance, high pressure resistance, wear resistance and repeated use for long drilling of a coal (rock) layer.

Claims

1. The utility model provides a wear-resisting packer of long brill Kong Shuili fracturing expansion in pit, a serial communication port, including setting up rubber tube (4) in the center tube (5) outside, set up capsule shoulder pad (3) at rubber tube (4) both ends respectively, capsule shoulder pad (3) are including fixed part (11) and rubber protection portion (12), fixed part (11) one side is connected with center tube (5), set up the fixed orifices in fixed part (11), rubber protection portion (12) one side stretches into the fixed orifices and is connected with fixed part (11), rubber protection portion (12) opposite side extends fixed part (11), rubber protection portion (12) inner wall and rubber tube (4) outer wall contact.

2. The downhole long drill Kong Shuili frac-expanding wear packer of claim 1, wherein the fixed portion (11) is threaded on one side for threaded connection with the base pipe (5).

3. The downhole long drill Kong Shuili frac-expanding wear packer of claim 1, wherein the rubber guard (12) is made of a rubber swelling material.

4. The downhole long drill Kong Shuili frac-expanding wear packer of claim 3, wherein the rubber swelling material is nitrile rubber NBR or hydrogenated nitrile rubber HNBR.

5. The underground long drill Kong Shuili fracturing expansion type wear-resistant packer according to claim 1, wherein one side of the rubber protection portion (12) extends into the fixing hole to be connected with the fixing portion (11) in a die-casting mode.

6. The downhole drilling Kong Shuili fracturing expansion type wear-resistant packer according to claim 1, wherein a water inlet (6) is formed in the central tube (5), and the water inlet (6) is arranged close to the rubber cylinder (4).

7. The underground long drill Kong Shuili fracturing expansion type wear-resistant packer according to claim 1, wherein sealing connecting pieces (2) are arranged at two ends of a central tube (5), and capsule shoulder pads (3) at two ends of a rubber cylinder (4) are fixed on the central tube (5) through one ends of the sealing connecting pieces (2).

8. The underground long drill Kong Shuili fracturing expansion type wear-resistant packer according to claim 7, wherein the other ends of the two sealing connecting pieces (2) are respectively connected with an upper joint (1) and a lower joint (7), and the upper joint (1) and the lower joint (7) are used for being connected with a drill rod.

9. The downhole long drill Kong Shuili fracturing expansion type wear-resistant packer according to claim 7, wherein the upper joint (1), the lower joint (7), the sealing connecting piece (2) and the central tube (5) are in threaded connection, and sealing rings are arranged in the middle.

10. The downhole long drill Kong Shuili frac-expanding wear packer of claim 1, wherein the fixed portion (11) is made of one of 42CrMo, 30CrMnSiA, 34CrNiMo 6.