Borehole wall pressure-resistant stabilizer for workover operation and application method thereof

Abstract

The invention discloses a borehole wall pressure-resistant stabilizer for workover operation. The borehole wall pressure-resistant stabilizer is prepared by mixing the following components in parts by weight: 20 to 30 parts of aluminum ore powder, 30 to 40 parts of sodium soil, 5 to 9 parts of xanthan gum, 32 to 44 parts of wood fiber powder, 5 to 10 parts of composite polymer, and 0.5 to 1 part of crosslinking agent. The stabilizer can be added into fresh water or seawater and then fully mixed and aged to form a temporary plugging liquid, and the concentration of stabilizer in the temporary plugging liquid is controlled in a range of 6-10%. The provided stabilizer can greatly improve the anti-permeability performance of flushing fluid or well killing liquid; the pressure resistant strength can reach 8 MPa or more, in the indoor experiments the pressure resistant strength can reach 16 MPa or more; the leakage of flushing liquid and filtrate thereof to the deep ground is effectively prevented, the ground and flushing liquid are completely separated, zero-loss operation can be achieved, and the hydrocarbon reservoir is effectively protected.

Description

technical field [0001] The invention relates to the technical field of petroleum production and development, in particular to a well wall anti-pressure stabilizer for preventing the leakage of well flushing fluid or well killing fluid in well operation and workover and an application method thereof. Background technique [0002] Petroleum development is accomplished by numerous oil production wells and water injection wells. Shandong Shengli Oilfield alone has invested in the development of 68 oil and gas fields, with more than 20,000 oil wells and nearly 8,000 water injection wells. Due to geological or engineering reasons, the number of oil wells that cannot produce normally accounts for a considerable proportion. Therefore, the number of workover operations is not only heavy, but some oil wells are difficult to work over and the workover period is long. The first step in the workover operation is to wash the well and kill the well. The purpose is to prevent the oil and ...

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Problems solved by technology

[0005] The purpose of the present invention is to aim at the defects existing in the prior art, to provide a well wall anti-pressure stabilizer and its application method for workover operations with good anti-leakage performance and effect, so as to solve the problem that the loss of well flushing fluid is very small during workover and well flushing. Large, causing oil layer pollution and damage problems

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