A cementing casing or tubing sliding sleeve with unlimited segments and clusters

A sliding sleeve and cementing technology, which is applied in the direction of wellbore/well components, wellbore/well valve devices, production fluids, etc., can solve the problem of inability to implement drilling and grinding operations, affect production and operation, and fail to meet the multi-stage number of oil and gas wells To meet the needs of fracturing reconstruction and other issues, to achieve the effect of facilitating production and post-operation, improving the effect of fracturing reconstruction, and reducing the risk of manual operation

Active Publication Date: 2017-11-10
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of the design size of the wellhead, wellbore, construction tubing string and tools, even if the above technologies are continuously optimized and perfected, the diameter of the tubing string decreases step by step during the fracturing process, and the sliding sleeves and ball seats of each section have throttling Affect the construction displacement; and the number of reconstruction sections is limited and the drilling and grinding operations cannot be carried out after the pipe string is not full-bore, which affects the later production and operation.
[0004] With the development of oil and gas fields, the multi-stage fracturing technology with a limited number of stages can no longer meet the needs of multi-stage fracturing for oil and gas wells
At present, the fracturing sleeve with an unlimited number of sections needs to use the pressure guiding pipeline for pressure transmission to form a ball seat, the workload of drilling is heavy, and there is a risk of leakage at the connection of the pipeline

Method used

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  • A cementing casing or tubing sliding sleeve with unlimited segments and clusters
  • A cementing casing or tubing sliding sleeve with unlimited segments and clusters
  • A cementing casing or tubing sliding sleeve with unlimited segments and clusters

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This embodiment provides a cementing casing or tubing sleeve with unlimited segments and clusters, such as figure 1 As shown, it includes an upper joint 1, a diameter reducing cylinder 2, a sliding sleeve body 3 and a lower joint 4 from top to bottom. The upper inner wall of the sleeve body 3 is threaded, the lower inner wall of the sliding sleeve body 3 is threaded with the upper outer wall of the lower joint 4, and the inner wall of the reducing tube 2 is equidistantly provided with multiple rings of grooves 9 so that the inner wall of the reducing tube 2 forms a concave-convex part There are spaced variable diameter areas, on which an elastic cylinder 5 is installed; the middle of the sliding sleeve body 3 is evenly distributed with a plurality of fracturing ports 10 along the circumferential direction, and the inner wall of the sliding sleeve body 3 is provided with a diameter expanding area 11 , the length of the diameter-expanding area 11 is greater than the lengt...

Embodiment 2

[0032] This embodiment further explains the implementation process of Example 1. During the implementation process, the number of grooves 9 designed on the inner wall of the reducing cylinder 2 depends on the number of stages to be fractured, and the first section of the sliding sleeve shall prevail, and one section shall be added. The convex and concave strokes increase by one. The protrusions and grooves of the variable diameter tube in the first section of the sliding sleeve body should be designed according to the length of the elastic tube 5. The design principle is to place the lower end of the elastic tube 5 in the bottommost groove (placed here so that the lower end of the elastic tube is in the expansion position). Diameter state), at this time, the position of the upper end of the elastic cylinder is the position of the corresponding convex groove (placed here so that the upper end of the elastic cylinder is in a reduced diameter state). Therefore, in this embodiment...

Embodiment 3

[0037] Taking three-stage cementing casing sliding sleeves to fracture a four-section well in layers as an example, the working process of cementing casings or tubing sliding sleeves with unlimited sections is illustrated.

[0038] The present invention connects three-stage cementing casing sliding sleeves according to the number of fracturing layers, and the sliding sleeves are the third sliding sleeve, the second sliding sleeve, and the first sliding sleeve from top to bottom, and the pipe string is lowered to the fracturing layer such as Figure 8 . The third sliding sleeve, the second sliding sleeve, and the first sliding sleeve are designed as follows: Figure 3-1 shown. The initial installation position of the elastic cylinder is as follows from top to bottom: Figure 5-1 , Figure 5-2 , Figure 5-3 , The sliding sleeves are installed with C rings, and balls 1, 2, and 3 are of the same size.

[0039] refer to figure 1 , figure 2 , image 3 , Figure 4 , Figur...

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PUM

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Abstract

The invention relates to a cementing casing or tubing sliding sleeve with unlimited sections and clusters, comprising an upper joint, a reducing sleeve, a sliding sleeve body and a lower joint, the upper joint is connected with the reducing sleeve, and the reducing sleeve is connected with the sliding sleeve. The main body is connected, the sliding sleeve body is connected with the lower joint, and the inner wall of the reducing tube is provided with grooves to form a reducing area on the inner wall of the reducing tube, and an elastic tube is installed on the reducing area; the middle part of the sliding sleeve body is evenly distributed along the circumferential direction with multiple fracturing port, the inner wall of the sliding sleeve body is provided with an expanding area, the expanding area is located below the fracturing port, the sliding sleeve body is covered with an inner sliding sleeve, and a C ring is installed at the lower end of the sliding sleeve body. , gas field vertical wells, horizontal wells with unlimited sections and infinite clusters between sections, and the full diameter of the wellbore before fracturing, no throttling of sliding sleeves and ball seats, large construction displacement, can greatly improve the fracturing effect, increase the unit Well production: after fracturing, the ball and C ring made of soluble materials are dissolved or drilled off, and the wellbore becomes full diameter again, which is convenient for later production and operation.

Description

technical field [0001] The invention relates to a cementing casing or oil pipe sliding sleeve with unlimited sections and clusters, which is suitable for the technical field of fracturing reconstruction of vertical wells, inclined wells and horizontal wells in oil and gas fields. Background technique [0002] At present, there are two main types of multi-stage fracturing methods in domestic oil and gas fields: one is to use cable perforation and mechanical packers to achieve isolation between layers, and to complete multi-stage fracturing by sequentially opening fracturing sleeves; It uses hydraulic jet fracturing tools to carry out hydraulic jet perforation, realizes interlayer isolation through hydraulic jet effect, and completes multi-stage reconstruction by jet fracturing. [0003] The above-mentioned sliding sleeves all need to use small to large sealing balls to complete the opening of each section and the isolation from the modified section. Due to the limitation of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B34/06E21B43/26
Inventor 邵媛李宪文张文星张华光任国富任勇郭思文胡开斌蒙鑫冯飞薛晓伟
Owner PETROCHINA CO LTD
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