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Self-rebounding ball seat

A ball seat and fracturing ball technology, applied in the field of self-rebound ball seats, can solve the problems of long dissolution time, affecting the drainage effect, blockage of channels in the ball seat, etc. The effect of reliability

Active Publication Date: 2016-09-14
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, usually because the fracturing ball is under high pressure on the ball seat during fracturing, the contact part will be slightly squeezed and deformed under high pressure, causing the ball seat to be stuck. The ball seat is pushed away, so that the passage in the ball seat is blocked
If dissolvable balls are used, the dissolution conditions are usually stricter, and the dissolution time is longer, which affects the drainage effect

Method used

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  • Self-rebounding ball seat
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  • Self-rebounding ball seat

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This embodiment provides a self-rebounding ball seat, which includes a body and a plurality of fixing screws arranged in the body. The upper part of the body is a funnel 10 with a large upper part and a smaller lower part. The fluid channel 8 at the bottom, the solid annular part of the lower surface of the funnel 10 is symmetrically provided with a plurality of fixing screw holes 2 with the same number as the fixing screws, and the fixing screws are connected to the body through the fixing screw holes 2. The top of the screw is at least 10 mm higher than the sealing line 1 where the fracturing ball 9 contacts the funnel 10;

[0024] The fixing screw includes a rubber plug 3, a fixing screw outer cylinder 4, a fixing screw inner cylinder 6 and a rebound device. The fixing screw outer cylinder 4 is provided with a central through hole, and the upper part is provided with a positioning shoulder. The fixing screw outer cylinder 4. The upper part of the central through hole...

Embodiment 2

[0031] On the basis of embodiment 1, this embodiment provides a kind of figure 1 , 2 In the shown self-rebound ball seat, the rebound device is a spring 7, and the spring 7 is sleeved on the outer cylinder 4 of the fixing screw with interference, and the interference is at least 10 mm.

[0032] Installation process: the fixing screw outer cylinder 4 is connected with the fixing screw inner cylinder 6 through a φ5mm fixing pin, the rubber plug 3 is installed in the center hole of the fixing screw outer cylinder 4, and the spring 7 is installed from the fixing screw inner cylinder 6 to the Fix the lower end of the outer cylinder 4 of the screw, insert the assembled fixing screw into a fixing screw hole 2 in the solid annular part of the lower surface of the funnel 10, screw the lower end of the fixing screw into the fixing screw hole 2 and connect with the body by rotating, and connect the spring with 7 strings On the fixing screw outer cylinder 4, the spring 7 should have a co...

Embodiment 3

[0037] On the basis of Embodiment 1, this embodiment provides a self-rebound ball seat, and the fixing screw is made of a degradable material. Under the condition of satisfying the strength, the requirement of degradability is guaranteed, automatic degradation is realized under specific downhole conditions, and the retention of tools in the well is reduced.

[0038] The degradable material is composed of 85% by weight of aluminum, 5% of gallium-aluminum alloy, 5% of Bi and 5% of Cr. It has a high pressure bearing capacity, can reliably complete the channel sealing in the tool, and has a reliable seal, and can be completely dissolved in 70°C water within 15 days.

[0039] In this embodiment, the solid annular part of the lower surface of the funnel 10 is symmetrically provided with four fixing screw holes 2 about the center, as image 3 As shown, the force is uniform and the fracturing ball 9 is automatically and quickly detached from the ball seat, which can be used for multi...

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PUM

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Abstract

The invention provides a self-rebounding ball seat which comprises a body and multiple fixing screws arranged in the body. A big-end-up funnel is arranged on the upper portion inside the body, the center of the lower surface of the funnel is provided with a fluid channel penetrating through the bottom of the body, the annular solid portion of the lower surface of the funnel is provided with multiple fixing screw holes which are symmetrical about the center and have the same number as the fixing screws, the fixing screws are connected with the body through the fixing screw holes, and the top ends of the fixing screws are at least 10 mm higher than the seal line where a fracturing ball makes contact with the funnel. According to the self-rebounding ball seat, a locking and rebounding device is arranged, therefore, the reliability of the self-rebounding ball seat can be guaranteed, automatic separating of the fracturing ball and the ball seat is achieved, and the ball clamping risk of the ball seat is eliminated; the fixing screws can be made of a degradable material and can be automatically degraded under the specific downhole condition, and therefore the phenomenon that the tools are retained in a well is reduced.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field reservoir multi-layer reconstruction, and in particular relates to a self-rebounding ball seat. Background technique [0002] The ball-pitching multi-layer and multi-stage fracturing tools mostly use the "ball seat + fracturing ball" sealing structure. The spherical surface and the ball seat surface form a line seal to achieve the sealing of the central channel of the fracturing tool. It has a simple structure, low cost, and reliable pressure bearing. Etc. [0003] However, usually because the fracturing ball is under high pressure on the ball seat during fracturing, the contact part will be slightly squeezed and deformed under high pressure, causing the ball seat to be stuck. The ball seat is pushed away, so that the passage in the ball seat is blocked. If dissolvable balls are used, the dissolution conditions are usually stricter, and the dissolution time is longer, which affects the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B34/06E21B43/26
CPCE21B34/063E21B43/26
Inventor 胡相君付钢旦邵媛李旭梅白小佩张安康张雄涛刘江波安杰赵鹏玉
Owner PETROCHINA CO LTD