Disaster prediction method in mining process of near working face of oil-gas well

Abstract

The invention provides a disaster prediction method in a mining process of a near working face of an oil-gas well. The method comprises the following steps: S1, selecting a near coal mining working face of a waste oil-gas well in a coal mine, and collecting basic data of the working face; S2, performing numerical modeling according to the collected parameters of the coal mining working face, and analyzing the stress distribution conditions of an air inlet crossheading and an air return crossheading of the coal mining working face; S3, taking a steel pipe to determine the shear stress which canbe borne by damage of a oil-gas well casing; and S4, judging whether the oil-gas well is damaged or not by comparing the maximum shear stress of the coal mining working face with the maximum shear stress capable of being borne by the oil-gas well casing. According to the disaster prediction method in the mining process of the near working face of the oil-gas well, a material mechanical detectionmethod and a numerical modeling calculation method are combined, disaster prediction of the sleeve can be completed in a laboratory, and guidance is provided for design and safety protection of the oil-gas well.

Description

technical field [0001] The invention belongs to the technical field of safety, and in particular relates to a disaster prediction method for oil and gas wells. Background technique [0002] Oil and gas wells are information and material channels dug for the exploration and development of oil and natural gas resources. The well body of an oil and gas well is mainly composed of conduit, surface casing, technical casing, oil layer casing and cement sheath outside the casing of each layer. The casings of oil and gas wells are generally steel pipes, and the creeping formations will generate compressive stress on the casings, and the structural stress of the formations, including formation fault activities, underground earthquakes, and crustal movements, will also damage the casings; the corrosive substances contained in the formations Medium (sulfate, H 2 S, etc.) accelerate the damage of the casing. Since the 1990s, casing damage in my country's oilfields has been on the rise...

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Problems solved by technology

[0004] In order to solve the problem that the casing damage of oil and gas wells cannot be predicted in this field, the purpose of the present invention is to provide a disaster prediction method in the process of mining near the working face of oil and gas wells

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