CN112302602B

CN112302602B - Sliding sleeve opening device

Info

Publication number: CN112302602B
Application number: CN201910688111.9A
Authority: CN
Inventors: 赵伟; 刘涛; 王强; 侯治民; 胡顺渠; 崔警宇
Original assignee: China Petroleum and Chemical Corp; Sinopec Southwest Oil and Gas Co
Current assignee: China Petroleum and Chemical Corp; Sinopec Southwest Oil and Gas Co
Priority date: 2019-07-29
Filing date: 2019-07-29
Publication date: 2023-01-31
Anticipated expiration: 2039-07-29
Also published as: CN112302602A

Abstract

The invention provides a sliding sleeve opening device which comprises a clamping and hanging piece, wherein the clamping and hanging piece is provided with a body section, a clamping and hanging section connected with the body section and an axially extending first fluid channel arranged on the clamping and hanging piece, the first fluid channel is constructed to be opened in a first working state and blocked in a second working state, and the first fluid channel can be uniquely matched with a sliding sleeve to realize unlimited sliding sleeve connection.

Description

Sliding sleeve opening device

Technical Field

The invention relates to the technical field of oil and gas field reservoir transformation, in particular to a sliding sleeve opening device.

Background

As the development of hydrocarbon reservoirs advances towards low permeability tight reservoirs, the traditional tool technology associated therewith is no longer satisfactory. The sliding sleeve is one of key tools for communicating oil sleeve annular space and realizing layered fracturing in the fracturing process. In the gas testing process of well completion of the oil-gas well, the oil sleeve annulus is communicated through the opening action of the sliding sleeve, so that the operations of circulation, liquid replacement, sand fracturing and the like are realized. The single-layer construction operation only needs a sliding sleeve can, but multilayer segmentation construction then need concatenate a plurality of sliding sleeves on a tubular column, follow supreme one-level of opening down during the construction, the fracturing one deck. Along with the deep exploration and development of the compact gas reservoir, the horizontal section of the horizontal well is longer and longer, the number of sand fracturing sections is more and more, and ten-level, twenty-level and even tens-level sliding sleeve technologies are proposed.

The traditional sliding sleeve adopts a ball as a pressure building mechanism, the ball corresponds to a ball seat one by one, and the diameter of the ball is larger than the inner drift diameter of a ball receiving seat. When the multistage sliding sleeve is adopted for operation, different balls and ball-catching seats are gradually increased according to a certain step difference. During construction, balls are thrown in from small to large in sequence, and the corresponding sliding sleeves are opened. Because the sliding sleeve is limited by the structure, the inner diameter of the sliding sleeve has a plurality of throttling surfaces which are changed from small to big, and the achievable number of stages is small.

Disclosure of Invention

The invention provides a sliding sleeve opening device for a sliding sleeve, which aims at solving the technical problems in the prior art, and is partially or completely. The sliding sleeve opening device is provided with the clamping and hanging section which is only matched with the sliding sleeve, and unlimited sliding sleeve connection is realized.

According to the present invention, there is provided a sliding sleeve opening device, comprising:

a clamping and hanging piece which is provided with a body section and a clamping and hanging section connected with the body section,

an axially extending first fluid passage provided on the catch member,

wherein the first fluid channel is configured to be open in the first operating condition and to be blocked in the second operating condition.

In one embodiment, the hooking section comprises at least two elastic claws arranged at intervals circumferentially around the axis of the hooking member and a hooking portion arranged on the outer peripheral surface of the elastic claws.

In one embodiment, the catch is configured as a radial projection.

In one embodiment, the ball-and-socket joint further comprises an axially extending mandrel inserted into the first fluid channel, an axially extending second fluid channel is arranged on the mandrel, a ball is arranged in the second fluid channel, a ball seat matched with the ball is arranged on the inner wall of the second fluid channel, and the mandrel and the clamping section are radially spaced in the first working state.

In one embodiment, a blocker ring is disposed in the inner chamber of the second fluid passage, the blocker ring being disposed at the upper end of the ball.

In one embodiment, a concave surface for receiving a ball is provided between the inner circumferential surface and the lower end surface of the blocking ring.

In one embodiment, an axially extending groove is provided on the inner circumferential surface of the blocker ring.

In one embodiment, the mandrel includes a first section connected to the body section and a second section connected to the first section and extending out of the hooking section, wherein the first section is connected to the body section by shear pins and the second section has a radial dimension greater than the radial dimension of the first section.

In one embodiment, the first section and the second section are connected by a first ramp.

In one embodiment, the mandrel, ball, and stop ring are made of soluble material, or the mandrel, ball, stop ring, and clip are made of soluble material

Compared with the prior art, the sliding sleeve opening device has the advantages that the sliding sleeve opening device is provided with the clamping and hanging pieces which correspond to the sliding sleeves one by one, and unique matching is realized. Simultaneously, through setting up card pendant and corresponding sliding sleeve to can realize the purpose that the sliding sleeve opened, with the unlimited level connection who satisfies the sliding sleeve.

Drawings

Preferred embodiments of the present invention will be described in detail below with reference to the attached drawing figures, wherein:

FIG. 1 shows a cross-sectional view of a sliding sleeve opening device according to an embodiment of the present invention;

FIG. 2 is section A-A from FIG. 1;

FIG. 3 is section B-B from FIG. 1;

in the drawings, like parts are given like reference numerals. The figures are not drawn to scale.

Detailed Description

The invention will be further explained with reference to the drawings.

Fig. 1 shows a sliding sleeve opening device 100 according to the present invention. As shown in fig. 1, the sliding sleeve opening means 100 includes a hooking member 1 and a first fluid passage 2. The clip 1 has a body section 11 and a clip section 12 extending upward from the body section 11. The first fluid passage 2 is provided on the chucking member 1 and extends axially. At the same time, in the first operating state, the first fluid channel 2 is open, while in the second operating state, the first fluid channel 2 is blocked.

During construction, other components with a sliding sleeve have been run into the wellbore, and when it is desired to open the sliding sleeve, the sliding sleeve opening device 100 is run into the fracturing string. During the process of moving the sliding sleeve opening device 100 downwards, when moving to a non-matching sliding sleeve, the locking section 12 is not matched with the sliding sleeve and can freely pass through. Until a matching sleeve is encountered, the hooking section 12 acts to mate the sleeve opening device 100 with the sleeve. Then, the first fluid passage 2 is blocked, and the slide cover opening device 100 moves the slide cover downward and opens the slide cover after the pumping operation. The clamping and hanging piece 1 is arranged to correspond to the corresponding sliding sleeve, so that the purpose of opening the sliding sleeve is achieved, and unlimited level connection of the sliding sleeve is met.

In one embodiment, as shown in fig. 1 and 3, the hooking section 12 includes at least two elastic claws 13 circumferentially spaced around the axis of the hooking member 1 and hooking portions 14 provided on the outer circumferential surfaces of the elastic claws 13. Preferably, in the circumferential direction, a plurality of uniformly distributed elastic claws 13, for example six, are provided.

The latching portion 14 is configured as a radial projection. A plurality of the catching portions 14, for example, two may be provided at intervals in the axial direction. The engaging portion 14 can engage with a groove provided on the sliding sleeve, thereby engaging the sliding sleeve opening device 100 with the sliding sleeve.

When the sliding sleeve opening device 100 is lowered into the shaft, the elastic claws 13 are radially contracted under the action of the radial force applied by the pipe column, so that the sliding sleeve opening device 100 can be smoothly lowered. When the sliding sleeve opening device 100 is lowered to the target sliding sleeve position matched with the sliding sleeve opening device, under the self elastic force of the first elastic claw 13, the sliding sleeve opening device is expanded and restored to the initial state, and then the hanging part 14 on the first elastic claw 112a can be hung on the groove of the sliding sleeve. At this time, the sliding sleeve opening device 100 is in a state of opening the sliding sleeve.

In one embodiment, the sliding sleeve opening device 100 further comprises a mandrel 3. The mandrel 3 is inserted into the first fluid passage 2 to extend axially. An axially extending second fluid channel 31 is provided on the mandrel 3. A ball 4 is disposed in the second fluid passage 31. Meanwhile, a ball seat 32 engaged with the ball 4 is provided on an inner wall of the second fluid passage 31. During the lowering of the sliding sleeve opening means 100, the ball 4 does not form a seal with the ball seat 32, so that the second fluid passage 31 is opened. After the sliding sleeve opening device 100 is lowered into a specified sliding sleeve, the ball 4 acts on the ball seat 32 by means of pressurization to block the second fluid passage 31. That is, the opening of the first fluid passage 2 in the first operation state and the blocking of the first fluid passage 2 in the second operation state are achieved by the cooperation of the ball 4 in the second fluid passage 31 and the ball seat 32. Thus, the first operating state refers to a state where the sliding sleeve opening device 100 is in engagement with the sliding sleeve and the ball 4 is not pressure-set to the ball seat 32, and the second operating state refers to a state where the sliding sleeve opening device 100 is in engagement with the sliding sleeve and the ball 4 is pressure-set to the ball seat 32.

Preferably, the ball seat 32 may be configured as an arc-shaped surface provided on an inner wall of the second fluid passage 31 to better fit with the ball 4 to block the second fluid passage 31.

In addition, in the first operating state, the mandrel 3 is arranged at a distance from the hooking section 12 to form the rebounding space 5. For example, a second ramp 16 may be provided on the body section 11 such that the first fluid passage 2 flares adjacent the hooking section 12. Therefore, after the mandrel 3 is placed in the first fluid passage 2, the outer peripheral wall of the mandrel does not contact with the inner peripheral wall of the clamping section 12, so that a space is provided for the resilience of the elastic clamping claws 13, and the sliding sleeve opening device 100 is ensured to be smoothly put in.

A blocking ring 6 is arranged in the interior of the second fluid channel 31. The blocking ring 6 is provided at the upper end of the ball 4 to prevent the ball 4 from falling out of the second fluid passage 31. That is, the blocker ring 6 and ball seat 32 define the position of the ball 4. Preferably, a concave surface 61 for receiving the ball 4 is provided between the inner circumferential surface and the lower end surface of the stopper ring 6. During the process of lowering the sliding sleeve opening device 100, the ball 4 can be received in the concave surface 61 to avoid its hydraulic pressure from fleeing. It is also preferred that an axially extending groove 62 is provided on the inner circumferential surface of the blocking ring 6, as shown in fig. 2. This groove 62 allows the second fluid passage 31 to be kept in communication with the outside even if the ball 4 is located at the concave surface 61.

According to the invention, the mandrel 3 comprises a first section 33 and a second section 34 connected in series. Wherein the first section 33 is arranged within the first fluid channel 2. While the second section 34 extends upwards and out of the resilient catch 13. The radial dimension of the second section 34 is greater than the radial dimension of the first section 33. The first section 33 is connected to the body section 11 by shear pins 7. Through the arrangement of the mandrel 3 and the ball 4 in the second fluid channel 31, the purposes of plugging and opening the first fluid channel 2 are achieved, and the elastic claw 13 is supported to be incapable of moving radially after being matched with the sliding sleeve, so that the working safety is ensured. Specifically, the sliding sleeve opening device 100 is lowered into the corresponding sliding sleeve and the sliding sleeve are mutually engaged, and the hydraulic pressure acts on the ball 4 to block the second fluid passage 2. Further pressurizing, the mandrel 3 is subjected to downward resultant force to shear the shear pin 7 and move downwards, the second section 34 enters the inner cavity of the elastic claw 13 to prevent the elastic claw 13 from radially contracting, so that the sliding sleeve opening device 100 and the sliding sleeve are locked, and the sliding sleeve is opened safely.

Preferably, the first section 33 and the second section 34 are connected by a first bevel 35. Further preferably, the first inclined surface 35 is at an angle of 15-45 degrees to the axis. Through this kind of setting, can guarantee the stability of dabber 3 oneself, avoid stress concentration. At the same time, this arrangement allows the second section 34 to be lowered smoothly into the cavity formed by the resilient catch 3. In addition, during the running process of the mandrel 3, the first inclined surface 35 can be matched with the second inclined surface 16, so that the moving stability and the operation safety are ensured.

The sliding sleeve opening device 100 further comprises a stop collar 8. The limiting sleeve 8 is sleeved on the outer wall of the mandrel 3, and meanwhile, the upper end face of the limiting sleeve is abutted to the lower end face of the clamping and hanging piece 1, so that the position of the clamping and hanging piece 1 is limited.

According to the present invention, the sliding sleeve opening device 100 is made of soluble materials, such as magnesium aluminum alloy, phenolic resin, epoxy resin, etc. After the sliding sleeve is opened, the sliding sleeve opening means 100 is dissolved, thereby achieving a full bore. Of course, in the case of economic considerations, only the hooking member 1, the ball 4, the blocking ring 6 and the stop collar 8 are made of soluble material, achieving a relatively large flow passage of the string.

The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily make changes or variations within the technical scope of the present invention disclosed, and such changes or variations should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A sliding sleeve opening device, comprising:

a clip member having a body section and a clip section connected to the body section,

an axially extending first fluid passage provided on the catch member,

wherein the first fluid channel is configured to be open in a first operating condition and closed off in a second operating condition,

the sliding sleeve opening device also comprises a mandrel which is inserted into the first fluid channel and extends axially, a second fluid channel which extends axially is arranged on the mandrel, a ball is arranged in the second fluid channel, a ball seat which is matched with the ball is arranged on the inner wall of the second fluid channel, and the mandrel and the clamping section are radially spaced in a first working state,

the mandrel comprises a first section connected with the body section and a second section which is connected with the first section and extends out of the clamping and hanging section, wherein the first section is connected with the body section through a shear pin, and the radial size of the second section is larger than that of the first section.

2. The sliding sleeve opening device according to claim 1, wherein the hooking section comprises at least two elastic claws circumferentially spaced around an axis of the hooking member and a hooking portion provided on an outer circumferential surface of the elastic claws.

3. The sliding sleeve opening device of claim 2, wherein the catching portion is configured as a radial protrusion.

4. The sliding sleeve opening device according to any one of claims 1 to 3, wherein a blocking ring is provided in the inner cavity of the second fluid passage, said blocking ring being provided at the upper end of the ball.

5. The sliding sleeve opening device according to claim 4, wherein a concave surface for receiving the ball is provided between an inner peripheral surface and a lower end surface of the stopper ring.

6. The sliding sleeve opening device according to claim 5, wherein an axially extending groove is provided on an inner circumferential surface of the blocking ring.

7. The sliding sleeve opening device according to any one of claims 1 to 3, wherein the first section and the second section are connected by a first slope.

8. The sliding sleeve opening device according to claim 4, wherein said mandrel, said ball, said blocker ring are made of a soluble material, or said mandrel, said ball, said blocker ring and said catch are all made of a soluble material.