Selection method of coalbed methane production and completion technology in anisotropic heterogeneous reservoirs

Abstract

The purpose of the present invention is to scientifically select coalbed methane exploitation and completion technology based on the main permeability tensor of coal seam permeability and comprehensively consider the anisotropy and heterogeneity of coal seam permeability. To achieve this purpose, the technical solution adopted by the present invention is: first determine the location of the test coal seam permeability according to the geological map of the target coal seam, and then measure the main permeability tensor of each location, that is, measure the main permeability direction and the main permeability value , and then calculate the geometric mean permeability of each location. According to the distribution of geometric mean permeability, the whole coal seam is divided into multiple blocks, and the completion technology for exploiting coalbed methane in each block is determined according to the order of magnitude of geometric mean permeability. Finally, the completion technology is further optimized according to the main permeability direction. The technical scheme of the present invention is close to the real coalbed methane reservoir conditions, based on the coalbed permeability tensor, which is the key factor determining the success or failure of coalbed methane mining, and comprehensively considers the anisotropy and heterogeneity of the coalbed permeability, and then selects The completion technology of coalbed methane exploitation provides a solid theoretical basis for the selection of coalbed methane exploitation and completion technology, and improves the scientificity of the selection of coalbed methane exploitation and completion technology.

Description

technical field [0001] The invention belongs to the technical field of coalbed methane exploitation and well completion, and in particular relates to a method for scientifically selecting well completion technology by comprehensively considering the anisotropy and heterogeneity of coal seam permeability during coalbed methane exploitation. Background technique [0002] Coal bed gas, also known as coal bed gas, is mainly composed of methane that exists in coal seams. Coalbed methane is not only an important natural gas resource, but mining of coalbed methane also helps to reduce the gas content of coalbeds, reduce the risk of gas disasters in the process of coalbed mining, and protect the lives of miners. For a specific coal seam, choosing the appropriate well completion technology is the prerequisite for the commercial exploitation of CBM. However, the current selection of coalbed methane mining and completion technology is blind and lacks scientificity. It is usually carr...

AI Technical Summary

Problems solved by technology

However, the current selection of coalbed methane mining and completion technologies is somewhat blind and lacks scientific

It is usually carried out in a trial and error way, one method is not suitable and then another method is not only time-consuming and laborious, but also a waste of valuable coalbed methane resources

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