Pression-expansion type composite rubber sleeve outer packer

Abstract

The invention relates to a pressure-expansion type composite rubber sleeve outer packer. The problems that an existing sleeve outer packer is not high in sealing pressure, and rubber expands in advance in a downward-putting process are mainly solved. The pressure-expansion type composite rubber sleeve outer packer is characterized in that the outer side of the upper portion of a main body (5) is connected with a hydraulic cylinder (4) through an opening pin (3); the lower portion of the hydraulic cylinder (4) is connected with a pressing ring (7); the lower portion of the pressing ring (7) isprovided with a composite rubber sleeve (8); the lower portion of the composite rubber sleeve (8) is provided with a lower top ring (9); a gap is formed between the upper part of the hydraulic cylinder (4) and the main body (5); a liquid inlet hole (13) corresponding to the gap is formed in the main body (5); clamping springs (6) are arranged between the hydraulic cylinder (4) and the pressing ring (7); and a plurality of clamping grooves matched with the clamping springs (6) are formed in the outer wall of the main body (5). According to the pressure-expansion type composite rubber sleeve outer packer, the sealing pressure is improved, rubber can be prevented from expanding in advance, and smooth downward putting is guaranteed.

Description

technical field [0001] The invention relates to the field of oil fields, in particular to a pressure-expansion type composite rubber casing outer packer. Background technique [0002] With the continuous development of oil and gas fields, the crude oil in the formation is continuously extracted, causing the pressure of the formation to decrease. In order to maintain production capacity, a certain amount of water must be injected into the formation to increase the pressure and production capacity of the formation. After perennial water injection in the oil layer, the pressure of the oil layer generally rises; due to the poor or heterogeneous connectivity of the oil layer, local ultra-high pressure traps are formed in the oil layer, and the pressure difference between layers is large. In addition, during the drilling of exploration wells or production wells, high-pressure oil, gas, and water layers are often encountered, and the existence of these high-pressure oil, gas, and w...

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used compression expansion casing outer packer has a simple structure and reliable performance, but there is a problem of low sealing pressure; the commonly used water and oil expansion casing outer packer has a simple structure and low cost, but there is still a problem of running time. The rubber swells in advance, making it difficult or even impossible to run the casing, causing the risk of wellbore scrapping

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