CN-118029960-B - Automatically controlled toe end fracturing sliding sleeve

CN118029960BCN 118029960 BCN118029960 BCN 118029960BCN-118029960-B

Abstract

The invention discloses an electric control toe end fracturing sliding sleeve, which belongs to the technical field of oil and gas drilling equipment and comprises two joints, an inner cylinder, an outer cylinder, a sliding sleeve, a piston body, a supporting sieve plate, a water-absorbing expansion material cavity, a explosive cavity, a first isolating membrane, an electronic ignition device and a triggering mechanism, wherein the two joints are respectively and hermetically connected with the two joints, the sliding sleeve is positioned in an annular cavity between the inner cylinder and the outer cylinder and used for blocking the communication of sand blasting holes on the inner cylinder and the outer cylinder, and the first isolating membrane is used for separating the water-absorbing expansion material in the water-absorbing expansion material cavity from water. The invention utilizes the explosive material to explode and push the piston body to move, and the first isolating membrane is destroyed after the piston moves, so that the water-absorbing expansion material absorbs water to expand after contacting with water, the required explosive material is less, the impact effect on the pipe column is small, and simultaneously, the invention utilizes the water-absorbing expansion of the expansion material to push the sliding sleeve to move, and the whole moving process is slower and stable.

Inventors

LIN YONGXIANG
YANG JIUJIAN
ZHANG SHIFENG
GAO BIN
LIU WEIGANG

Assignees

兰德伟业科技集团有限公司
新疆兰德伟业油田服务有限公司

Dates

Publication Date: 20260512
Application Date: 20240329

Claims (8)

1. An electronically controlled toe end fracturing slide sleeve, characterized by further comprising: Two joints arranged at intervals; An inner cylinder with two ends respectively connected with the two joints; The two ends of the outer cylinder are respectively connected with the two connectors, wherein the inner cylinder is positioned in the outer cylinder and is arranged at intervals, and sand blasting holes which radially penetrate through the body are formed in the side walls of the inner cylinder and the outer cylinder; The sliding sleeve is in sliding sealing connection with the outer wall of the inner cylinder and the inner wall of the outer cylinder and is used for blocking a connecting channel between sand blasting holes on the inner cylinder and the outer cylinder; The annular supporting sieve plate is positioned in the annular cavity between the inner cylinder and the outer cylinder and fixedly connected with the inner cylinder or the outer cylinder, and sieve holes penetrating through the supporting sieve plate body along the axial direction of the inner cylinder are formed in the supporting sieve plate; The water-absorbing expansion material cavity is positioned in the annular cavity between the inner cylinder and the outer cylinder and between the supporting sieve plate and the sliding sleeve, and is used for storing the water-absorbing expansion material, and the size of the water-absorbing expansion material is larger than that of the sieve hole on the supporting sieve plate; A first separation membrane for separating the water-swellable material from water; An explosive cavity in the annular cavity between the inner cylinder and the outer cylinder for storing explosive substances; The explosive cavity is formed by a piston body, a first isolating membrane and a water absorbing expansion material, wherein the piston body is in sliding sealing connection with the outer wall of the inner cylinder and the inner wall of the outer cylinder; An electronic ignition device for introducing explosive substances in the explosive chamber; and the triggering mechanism is used for triggering the action of the electronic ignition device.
2. The electronically controlled toe end fracking slide sleeve of claim 1 wherein the first isolation diaphragm is annular and is sealingly connected to the inner and outer barrels, and the annular cavity between the first isolation diaphragm and the piston body is a water storage chamber for storing water.
3. The electronic toe end fracturing slide sleeve of claim 2, wherein a membrane breaking mechanism is arranged at one end of the piston body facing the first isolating membrane and used for puncturing the first isolating membrane, and the water storage chamber is provided with a gas phase space.
4. The electronic toe end fracturing sliding sleeve of claim 1, wherein a first fluid channel penetrating through the body in the radial direction is arranged on the inner cylinder or the outer cylinder, the first fluid channel is communicated with the water-absorbing expansion material cavity, the first isolating membrane is positioned in the water-absorbing expansion material cavity, a membrane breaking mechanism is arranged at one end, facing the first isolating membrane, of the piston body, and the membrane breaking mechanism can penetrate through a through hole in the sieve plate and puncture the first isolating membrane.
5. The electrically controlled toe end fracturing sleeve of claim 4, wherein said inner or outer barrel is provided with a balancing hole extending radially through the body, said balancing hole communicating with said explosive chamber for introducing water into said explosive chamber for balancing the pressure at the upper and lower ends of said sleeve, said explosive chamber having a second barrier for separating water from the explosive.
6. The electronically controlled toe end frac sleeve of claim 5, wherein said second barrier membrane is formed of an elastomeric material.
7. The electronic toe end fracturing sliding sleeve of claim 1, wherein through holes corresponding to the sand blasting holes are formed in the sliding sleeve, when the through holes are right opposite to the sand blasting holes, the sand blasting holes in the inner cylinder and the outer cylinder are communicated in a centered manner, and when the through holes are far away from the sand blasting holes, the sand blasting holes in the inner cylinder and the outer cylinder are closed.
8. The electrically controlled toe end fracturing sleeve of claim 7, wherein the inner wall of the inner cylinder or the outer wall of the outer cylinder is fixedly provided with a limiting piece, so that after sand spraying holes on the inner cylinder and the outer cylinder are aligned with through holes on the sleeve, the sleeve does not move any more.

Description

Automatically controlled toe end fracturing sliding sleeve Technical Field The invention relates to the technical field of oil and gas drilling equipment, in particular to fracturing construction equipment, and specifically relates to an electric control toe end fracturing sliding sleeve. Background The toe end fracturing sliding sleeve is key equipment for underground fracturing operation, and structurally mainly comprises an inner cylinder, an outer cylinder and a sliding sleeve positioned between the inner cylinder and the outer cylinder, wherein the main function of the sliding sleeve is to seal sand spraying holes in the inner cylinder and the outer cylinder, so that fluid flow between the inner cylinder and the outer cylinder is effectively blocked. Once the sliding sleeve moves under the pushing of external force, the sand blasting holes are communicated with each other, and the fracturing operation can be smoothly performed. In the prior art, the toe end fracturing sliding sleeve is generally driven to move by increasing the pressure difference of liquid in the inner cylinder and the outer cylinder in a mode that two ends of the sliding sleeve are respectively communicated with the fluid in the inner cylinder and the fluid outside the outer cylinder. In addition, in order to avoid malfunction of the sliding sleeve during the pressure test of the well bore, a plurality of shearable pins are generally used to fix the sliding sleeve on the inner cylinder or the outer cylinder. However, the shearing fracture of the shearable pin often has about 15% error, and as the number of pins increases, the deviation of the opening pressure also increases further, which undoubtedly brings about a plurality of inconveniences for well cementation and drift diameter operation. To the above-mentioned problem, CN107288602B patent discloses an electronically controlled toe end fracturing sliding sleeve, which precisely controls the opening and closing of a runner at one end of the inner cylinder connected with the sliding sleeve through an electric mechanism. Only when confirming that the sliding sleeve needs to be moved, the runner can be opened by the electric mechanism, so that the use quantity of shearing pins is reduced, the fluid pressure in the inner cylinder can easily push the sliding sleeve to move after the runner is opened, and the deviation of opening pressure is further reduced. However, this design adds an electric drive mechanism, making the overall structure more complex. In order to simplify the structure, CN117345188a patent discloses a pre-formed Cheng Diankong toe end fracturing sleeve. The explosive is detonated in an electronic ignition mode, and the sliding sleeve is pushed to move by high-pressure shock waves generated by explosion of the explosive, so that an electric transmission mechanism is omitted. However, it is worth noting that, because the sliding sleeve needs to bear a great pressure difference between the inner cylinder and the outer cylinder in the use process of shaft pressure test and the like, and the sliding sleeve and the inner cylinder are made of hard materials, once the inner cylinder and the outer cylinder are slightly deformed or impurities enter the friction surface, the sliding friction force of the sliding sleeve can be rapidly increased, and the successful opening of the sliding sleeve is seriously affected. In order to ensure successful opening, a large amount of explosive must be used to generate extremely strong shock waves, but the shock waves are destructive to a certain extent, and are likely to cause damage to surrounding casings, such as deformation, breakage and the like, so that normal oil and gas exploitation is affected. Disclosure of Invention In order to solve at least one of the problems, the invention provides the electronic control toe end fracturing sliding sleeve, which has the advantages of high opening success rate, stable opening process and small damage to a tubular column. The specific scheme of the invention is as follows: An electronically controlled toe end fracturing sleeve comprising: Two joints arranged at intervals; An inner cylinder with two ends respectively connected with the two joints; The two ends of the outer cylinder are respectively connected with the two connectors, wherein the inner cylinder is positioned in the outer cylinder and is arranged at intervals, and sand blasting holes which radially penetrate through the body are formed in the side walls of the inner cylinder and the outer cylinder; The sliding sleeve is in sliding sealing connection with the outer wall of the inner cylinder and the inner wall of the outer cylinder and is used for blocking a connecting channel between sand blasting holes on the inner cylinder and the outer cylinder; The annular supporting sieve plate is positioned in the annular cavity between the inner cylinder and the outer cylinder and fixedly connected with the inner cylinder or the outer cylinder