Novel soluble ball seat structure suitable for unconventional oil and gas exploitation

Abstract

The invention discloses a novel soluble ball seat structure suitable for unconventional oil and gas exploitation, relates to the technical field of soluble bridge plugs, and is used for optimizing the structure of an original soluble bridge plug so as to solve the problems that the original soluble bridge plug is not solid in anchoring and not tight in sealing. The soluble ball seat comprises a cone, a slip body and an anti-collision ring which are sequentially connected from top to bottom, the cone is sequentially sleeved with a metal sealing ring and a rubber sealing rubber sheet, and an embedded slip block is installed in the circumferential direction of the slip body; according to the soluble ball seat structure, a single-slip structure is adopted, and an embedded slip nail is replaced by the embedded slip block, so that the overall anchoring pressure-bearing performance of the soluble ball seat is greatly improved; and a metal sealing ring is combined with a rubber sealing rubber sheet for expansion sealing, so that the sealing performance of the soluble ball seat is greatly improved on the basis of ensuring the current pressure-bearing grade requirement.

Description

technical field [0001] The invention relates to the technical field of soluble bridge plugs, and more particularly to a novel soluble ball seat structure which can increase anchoring and sealing performance. Background technique [0002] With the increasing dependence on foreign oil and gas resources in my country, it is urgent to increase the exploration and development of oil and gas resources and increase oil and gas production. However, conventional oil and gas resources have been unable to meet the demand. Unconventional resources represented by shale gas and tight oil and gas have gradually become oil and gas. main force of production. Unconventional reservoirs have poor physical properties and strong heterogeneity due to the development of natural fractures, so it is difficult for conventional hydraulic fracturing methods to achieve economical and effective development. People often use bridge plugs or packers to seal off and fracturing formations, which has greatly i...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the soluble bridge plug is usually anchored by embedded slips, which makes the stress and strain of the slips embedded in the slips concentrated near the contact with the casing wall, and the maximum stress on the slips is far away. If the yield strength of the material is exceeded, the slip nail may undergo large plastic deformation, resulting in the failure of slip anchoring; in addition, the downhole operation of volume fracturing is often in harsh environments and working conditions such as high temperature, high pressure, heavy load and strong corrosion. The body structure of the sealing ring is torn and broken under the setting condition, and the sealing failure during the fracturing process occurs from time to time, resulting in the failure of the ball seat setting, the leakage of fracturing fluid due to poor sealing between stages, and the loss of fracturing fluid between clusters. The loss is too large, the fracturing operation fails, and even causes downhole accidents Pure metal seals

[0004] Therefore, based on this situation, we provide a new type of soluble ball seat structure that can increase the anchoring and sealing performance. The soluble ball seat is optimized and upgraded on the basis of the original bridge plug to solve the above-mentioned unrealistic anchor , poor sealing and other issues

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