High-temperature and high-pressure resistant quick drillable composite material bridge plug with combined sealing structure

Abstract

The invention relates to a high-temperature and high-pressure resistant quick drillable composite material bridge plug with a combined sealing structure. The bridge plug comprises a mandrel, and an upper push ring, an upper block, an upper block guide cone, a combined sealing structure, a lower block guide cone, a lower block and a lower limiting body coating the mandrel in sequence, wherein the lower limiting body is fixedly connected with the mandrel; and the upper push ring, the upper block, the upper block guide cone, the combined sealing structure, the lower block guide cone, the lower block and the lower limiting body are all prepared by high-temperature resistant composite materials. The bridge plug has the following beneficial effects: the composite material parts of the bridge plug are all prepared by the high-temperature composite materials, so that the mechanical performance is not obviously reduced at high temperature, and the reliability of the bridge plug is guaranteed. The unique material design enables easy drilling and milling; and the milled chips are smaller, and are easier to be circulated and returned out to prevent drilling blockage. In addition, as the composite materials are low in density and light in mass, the bridge plug is specifically suitable for such operations as separate layer fracturing and plugging of inclined wells and horizontal wells, and overcomes such defects as easy blockage and difficult drilling and milling in metal bridge plugs.

Description

technical field [0001] The invention relates to the technical field of oil and gas extraction tools, in particular to a high temperature and high pressure resistant rapid drillable composite bridge plug with a combined sealing structure. Background technique [0002] In the process of petroleum exploration and development, sealing layer is a very important operation process of layered water injection, layered oil testing, layered fracturing and acidification, layered production and sealing water layer, sealing dry layer and sealing abandoned layer. According to different operation purposes, it is necessary to temporarily or permanently seal the relevant production layers, which can accurately evaluate the characteristics of the production layers, scientifically and reasonably formulate and implement the development plan. an effective technique. For multi-layer completion of production wells, temporary barriers, etc., it is necessary to use bridge plugging and layering tools...

AI Technical Summary

Problems solved by technology

However, the currently commonly used metal bridge plugs have disadvantages such as easy sticking and difficulty in drilling and milling, especially for layered fracturing and plugging of deviated wells and horizontal wells. Due to the influence of their special well body structures, such wells cannot When removing the metal bridge plug for grinding and milling, there are disadvantages such as easy jamming, difficult milling and drilling, time-consuming, low reliability, etc.

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