High temperature and high pressure drainage dynamic evaluation system for coal bed and gas reservoir double-layer commingled production

Abstract

The invention discloses a high temperature and high pressure drainage dynamic evaluation system for coal bed and gas reservoir double-layer commingled production, which comprises a high temperature and high pressure drainage dynamic evaluation instrument for commingled production in which a coal bed gas inlet is combined with an injection outlet and a high temperature and high pressure drainage dynamic evaluation instrument for commingled production in which the inlet is separated from the injection outlet, wherein the high temperature and high pressure drainage dynamic evaluation instruments respectively comprise a driving and displacing module, a core clamping module, a bottom water simulation module, a confining pressure and back pressure module, a vacuumizing module, a measuring module and a temperature control and data acquisition module. The high temperature and high pressure drainage dynamic evaluation system has the beneficial effect that two sets of experiment equipment provided by the invention are specially used for evaluating the feasibility, the rationality, the scientificity and the utility of coal bed gas double-layer commingled production, simulating and evaluating the effects of critical desorption pressure, reservoir pressure difference, supplied liquid change, permeability difference and gas production working liquid level difference in respective reservoirs on drainage parameters under the double-layer commingled production condition and further optimizing a double-layer commingled production and drainage scheme so as to improve the yield of a vertical well and a single well, improve the production efficiency and promote quick, efficient and safe development of coal bed gas.

Description

technical field [0001] The invention belongs to the technical field of exploration and development of coalbed methane, and in particular relates to a dynamic evaluation system for high temperature and high pressure drainage and production of double-layer commingled mining of coalbed methane. Background technique [0002] The “Twelfth Five-Year Plan for the Development and Utilization of Coalbed Methane (Coal Mine Gas)” issued by the state in 2012 pointed out that by 2015, the newly added proven reserves of coalbed methane in my country will be 1.0×10 12 m 3 , the output will reach 300×10 8 m 3 , of which the ground drilling is 160×10 8 m 3 , build the Qinshui Basin and the CBM industrialization base in the eastern margin of the Ordos Basin. However, my country's coalbed methane has the characteristics of extremely complex geological occurrence conditions, low resource proven rate, and difficult development, which makes the mining of coalbed methane extremely demanding o...

AI Technical Summary

Problems solved by technology

However, my country's coalbed methane has the characteristics of extremely complex geological conditions, low proven resource rate, and great difficulty in development, making the mining of coalbed methane extremely demanding on mining technology

At present, there are two major problems in coalbed methane in my country: low recovery rate and low utilization rate, which seriously restrict the efficient and reasonable development and utilization of coalbed methane. F

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