Casing pipe parameter and cement sheath parameter determination method and casing parameter and cement sheath parameter determination device

Abstract

The embodiment of the invention provides a casing pipe parameter and cement sheath parameter determination method and a casing parameter and cement sheath parameter determination device, wherein the method comprises the following steps: acquiring a stress feature parameter of stratum and a viscoplasticity feature parameter of the stratum of a target region; according to the parameters, building ahorizontal section mechanical model and a vertical section mechanical model; jointly solving the horizontal section mechanical model and the vertical section mechanical model, thereby determining thecasing pipe parameter and the cement sheath parameter which confirm to a plurality of preset targets. Since geological environment of a casing pipe and a cement sheath under real work conditions is considered in the scheme, the stress feature parameter and the viscoplasticity feature parameter of the stratum are obtained and used for accurately simulating the viscoplasticity feature of the stratumwhere the casing pipe is; two mechanical models in a horizontal direction and a vertical direction are built simultaneously for performing multi-target optimization solving, and thus, a technical problem of relatively poor accuracy of the casing pipe parameter and the cement sheath parameter determined in the existing method is solved.

Description

technical field [0001] The application relates to the technical field of oil and gas development, and in particular, to a method and device for determining casing parameters and cement sheath parameters. Background technique [0002] When laying oil and gas wells, a cement sheath is usually set in the annulus between the casing of the oil and gas well and the formation for cementing. In fact, the casing buried in the ground is often squeezed by the stress in the formation transmitted by the cement sheath. When the stress on the casing exceeds a certain value, the casing is deformed, and even the casing is damaged. How to design a casing and a cement sheath that can better withstand the formation stress is very important for the layout of oil and gas wells and the long-term stable and safe use of oil and gas wells. [0003] At present, most of the existing methods simply establish a casing model, and then artificially set some constraints, and then use the above model to opt...

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Problems solved by technology

[0005] The embodiment of the present application provides a method and device for determining casing parameters and cement sheath parameters to solve the problem that existing methods have poor accuracy in determining casing parameters and cement sheath parameters and cannot meet the requirements of real working conditions technical problems, to accurately and efficiently determine the technical effects of casing and cement sheaths that can meet multiple target requirements at the same time

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