Coal bed gas reservoir layering co-mining high temperature and high pressure discharging mining dynamic evaluation instrument

Abstract

The invention discloses a coal bed gas reservoir layering co-mining high temperature and high pressure discharging mining dynamic evaluation instrument. The coal bed gas reservoir layering co-mining high temperature and high pressure discharging mining dynamic evaluation instrument comprises a displacement module, a core clamping module, a bottom water analog module, a surround pressure module, a return pressure module, a vacuum pumping module, a measuring module and a temperature control and data collecting module. The coal bed gas reservoir layering co-mining high temperature and high pressure discharging mining dynamic evaluation instrument is particularly used for evaluating influence of critical desorption pressure, reservoir differential pressure, permeability differences and feed liquid capacity differences I respective reservoir on discharging mining parameters in coal bed gas layering co-mining, explores an optimal discharging mining system in layering co-mining technology to improve using degrees of all layering, increases gas output per well, eliminates influence of interference between layers on production, achieves reasonable, long and efficient development, improves recovery efficiency of coal bed gas, and promotes development of mining technology of the coal bed gas.

Description

technical field [0001] The invention belongs to the technical field of coalbed methane exploration and development, and in particular relates to a dynamic evaluation instrument for high-temperature and high-pressure drainage and production of coalbed methane reservoir layers. Background technique [0002] According to my country's newly issued natural gas development plan, by 2015 the national natural gas demand will reach 2600×10 8 m 3 , of which domestic natural gas production is 1700×10 8 m 3 , import 900×10 8 m 3 . According to the latest round of resource evaluation data from the Ministry of Land and Resources, by 2015 my country's conventional natural gas production is expected to reach 1200×10 8 ~1300×10 8 m 3 , this yields a horizontal distance of 1700×10 8 m 3 The target still has 400×10 8 ~500×10 8 m 3 the gap. In fact, my country has entered a stage of rapid growth in natural gas demand. In 2011, the total domestic natural gas consumption was close ...

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Problems solved by technology

[0007] The purpose of the present invention is to use a dynamic evaluation instrument for high temperature and high pressure drainage of coalbed methane reservoir layered simultaneous mining, aiming to solve the lack of a set of experimental equipment at home and abroad, which is specially used to evaluate the coalbed methane layered simultaneous mining in the respective reservoirs. The influence of critical desorption pressure, reservoir pressure difference, permeability difference, and liquid supply capacity difference on drainage parameters, and explore the optimal drainage system under layered simultaneous mining technology to improve the degree of production layer production and increase the gas production rate of a single well in a coal seam To achieve reasonable, long-term and efficient development, improve the recovery rate of coalbed methane, and promote the development of coalbed methane mining technology

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