CN-122014156-A - Layered sliding sleeve with sand prevention function along with production pipe column running

Abstract

The invention provides a layered sliding sleeve with a sand control function along with the running of a production string, and relates to the technical field of downhole tools for petroleum exploitation, wherein the device comprises a string component and a sand control screen pipe, wherein the string component comprises an inner string and the production sliding sleeve connected with the inner string, and the inner string and the production sliding sleeve are hollow structures to form a central production channel; the sand control screen pipe is sleeved on the outer side of the pipe column assembly, and an annular production channel is reserved between the sand control screen pipe and the pipe column assembly. According to the invention, the sand control screen pipe is directly sleeved outside the production sliding sleeve, the integration of layered sand control and production functions is realized by one pipe column, the number of times of well descending is reduced, the operation efficiency is improved, and the sand control screen pipe is particularly suitable for working conditions such as haydite migration problem at a branch well window, sand control production after open hole gravel filling of a horizontal well, efficient development of a low permeability reservoir, long-term production of a slight sand production well and the like, and the production efficiency and stability of the oil well can be remarkably improved.

Inventors

• SU JIANBO
• XUE JIAHUI
• CHEN LI
• LIN ZHENXIANG
• WU PENGHAO
• FAN SHIYU
• WANG WEI
• ZHENG JINLONG
• YANG WEIFENG
• LIU XIANYU
• JIAN CHENG
• REN SONGTAO
• CHEN CAI
• HUANG JIAMING

Assignees

• 中海石油(中国)有限公司湛江分公司

Dates

Publication Date

20260512

Application Date

20260403

Claims (10)

1. 1. The utility model provides a down layering sliding sleeve that possesses sand control function along with production tubular column, its characterized in that includes tubular column subassembly and sand control screen pipe (5), wherein: The pipe column assembly comprises an inner pipe column (4) and a production sliding sleeve (6) connected with the inner pipe column (4), wherein the inner pipe column (4) and the production sliding sleeve (6) are hollow structures to form a central production channel; The sand control screen (5) is sleeved on the outer side of the pipe column assembly, and an annular production channel is reserved between the sand control screen (5) and the pipe column assembly.
2. 2. The production string running-in layered slip sleeve with sand control function according to claim 1, wherein the inner string (4) comprises a first inner string unit (41) and a second inner string unit (42), wherein: the first inner pipe column unit (41) is connected to one side of the production sliding sleeve (6); The second inner tubular column unit (42) is connected to the other side of the production sliding sleeve (6).
3. 3. The layered sliding sleeve with sand control function according to claim 2, wherein the first inner pipe column unit (41) and the second inner pipe column unit (42) are formed by sequentially connecting one pipe column or a plurality of pipe columns.
4. 4. A layered slip cover with sand control function as set forth in claim 2 or 3, wherein the string assembly further comprises a first connection end (1) and a second connection end (8), wherein: the first connecting end head (1) is arranged at the upper part of the first inner pipe column unit (41); the second connecting end head (8) is arranged at the lower part of the second inner pipe column unit (42); The first connection end (1) and the second connection end (8) each comprise standard API threads.
5. 5. A layered slip cover with sand control function running into a production string according to claim 2 or 3, characterized in that the string assembly further comprises a first connection (2) and a second connection (7), wherein: The first connecting piece (2) is used for connecting the first inner pipe column unit (41) and the sand control screen (5); the second connecting piece (7) is used for connecting the second inner pipe column unit (42) and the sand control screen (5).
6. 6. The layered sliding sleeve with sand control function according to claim 5, wherein the first connecting piece (2) and the second connecting piece (7) comprise API standard threads and are provided with stress relief grooves.
7. 7. The layered sliding sleeve with sand control function according to claim 6, wherein the pipe column assembly further comprises a sealing mechanism (3), the sealing mechanism (3) is arranged between the first connecting piece (2) and the first inner pipe column unit (41) and between the second inner pipe column unit (42) and the second connecting piece (7), an O-shaped ring is arranged on the inner side of the sealing mechanism (3), and a diversion inclined plane of 15-30 degrees is arranged in the inner cavity of the inner pipe column (4).
8. 8. The layered sliding sleeve with the sand control function, which is arranged along with the production string, according to any one of claims 1 to 3, is characterized in that the sand control screen (5) is a precise screen pipe and comprises a base pipe, a stainless steel screen and a protective cover which are sequentially arranged from inside to outside, and the filtering precision of the precise screen pipe is 50-200 mu m.
9. 9. The layered sliding sleeve with sand control function according to any one of claims 1-3, wherein the tubular column component is formed by forging 42CrMo alloy steel by adopting an X-shaped sliding sleeve design, and the bearing capacity is not lower than 70MPa.
10. 10. A layered sliding sleeve with sand control function according to any one of claims 1-3, characterized in that the sand control screen (5) and the tubular column component are in hot-set interference fit.

Description

Layered sliding sleeve with sand prevention function along with production pipe column running Technical Field The invention relates to the technical field of downhole tools for petroleum exploitation, in particular to a layered sliding sleeve with a sand prevention function when a production string is lowered. Background Sand control and efficient production of loose sandstone formations, heterogeneous reservoirs, and wells with complex structures such as branch wells, horizontal wells and the like are all the time core technical problems in the field of petroleum and natural gas exploitation. The sand grains of the stratum are easy to move along with the oil-gas fluid, so that not only can the underground equipment such as an electric pump, an oil pipe and the like be worn and a production channel be blocked, but also the premature production stopping of an oil well can be caused, and the well repairing cost and the production risk are greatly increased. The traditional sand control technology generally adopts a step-by-step operation mode of firstly putting into a sand control pipe column and then putting into a production pipe column, and the split design exposes a plurality of defects in practical application. Firstly, the construction flow is complicated due to the step-by-step operation, the completion period is obviously prolonged, and the operation cost is increased; secondly, the annulus between the sand control pipe column and the production pipe column is easy to be a channel for sand migration, and effective sand blocking is difficult to realize; in addition, in the exploitation process of the branch well, after the hollow whipstock is directionally perforated, filling ceramsite at the blind section of the branch well hole can be moved to the position of the electric pump through the perforation holes during the production of the main well hole, so that the production of the oil well is abnormal. In the prior art, although the open hole gravel packing sand prevention process of the double horizontal branch well appears, loose stratum sand production can be prevented to a great extent, but the problem that packing media or stratum sand enters an oil well from communicated perforation holes can not be solved. Therefore, a layered sliding sleeve with a sand control function is needed to solve the above technical problems. Disclosure of Invention The invention aims to provide a layered sliding sleeve with a sand control function along with the running of a production pipe column, so as to solve the problems of low operation efficiency and unsatisfactory sand control effect caused by separation of sand control and production tools in the prior art. The preferred technical solutions of the technical solutions provided by the present invention can produce a plurality of technical effects described below. In order to achieve the above purpose, the present invention provides the following technical solutions: The invention provides a layered sliding sleeve with a sand control function along with the running of a production string, which comprises a string component and a sand control screen pipe, wherein: the pipe column assembly comprises an inner pipe column and a production sliding sleeve connected with the inner pipe column, and the inner pipe column and the production sliding sleeve are hollow structures to form a central production channel; the sand control screen pipe is sleeved on the outer side of the pipe column assembly, and an annular production channel is reserved between the sand control screen pipe and the pipe column assembly. Preferably, the inner tube column comprises a first inner tube column unit and a second inner tube column unit, wherein: The first inner pipe column unit is connected to one side of the production sliding sleeve; The second inner pipe column unit is connected to the other side of the production sliding sleeve. Preferably, the first inner pipe column unit and the second inner pipe column unit are formed by sequentially connecting one pipe column or a plurality of pipe columns. Preferably, the tubular string assembly further comprises a first connection head and a second connection head, wherein: The first connecting end is arranged at the upper part of the first inner pipe column unit; the second connecting end is arranged at the lower part of the second inner pipe column unit. The first connection end and the second connection end each include standard API threads. Preferably, the tubular string assembly further comprises a first connector and a second connector, wherein: The first connecting piece is used for connecting the first inner pipe column unit and the sand control screen; the second connecting piece is used for connecting the second inner pipe column unit and the sand control screen. Preferably, the first connector and the second connector each comprise API standard threads and are each provided with a stress relief groove. Preferably, the pipe column ass