Physical simulation device and simulation method for coal bed methane production

Abstract

The invention relates to a physical simulation device and a simulation method for coal bed methane production. In the process of production simulation of the current production experiment well and numerical simulation, the cost is high and the accuracy of the numerical simulation can not be ensured. In the physical simulation device and the simulation method for coal bed methane production of the invention, the device comprises sample bins, a thermostatic water bath system, a gas/water metering system and a pressure monitoring system, wherein the sample bins are mutually connected through gas/water configuration production pipelines to form a simulation system; the thermostatic water bath system is arranged around the simulation system; the sample bins of the simulation system are all connected with confining pressure simulation pipelines; the pressure monitoring system is arranged on the gas/water configuration production pipelines at the ends of the sample chambers; simulation well mouths are connected with the gas/water configuration production pipelines at the tail ends of the simulation system; and the simulation well mouths are connected with the gas/water metering system. Through the device and simulation method of the invention, the gas filling, water injection and production states are simulated, thereby optimizing the gas well production working system, reducing the cost, and simultaneously ensuring safe high-efficiency exploitation of the coal bed methane.

Description

technical field [0001] The invention relates to a device for physically simulating the development process of a coalbed methane surface vertical well by means of simulation and a method for simulating using the device, in particular to a physical simulation device for coalbed methane production and a simulation method thereof. Background technique [0002] At present, my country's coalbed methane production capacity prediction and evaluation are mainly carried out in two ways, one is production test wells, and the other is reservoir numerical simulation. [0003] Production test wells are the most accurate means to obtain and evaluate the real productivity of gas wells, but because production test wells are one-off, one well can only test one working system, and once the working system is unreasonable, it will not be possible to obtain real production capacity. Therefore, it is a very expensive method to use development test wells for productivity evaluation, and it is impos...

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Problems solved by technology

[0003] Production test wells are the most accurate means to obtain and evaluate the real productivity of gas wells, but because production test wells are one-off, one well can only test one working system, and once the working system is unreasonable, it will not be possible to obtain real production capacity. Therefore, it is a very expensive method to use development test wells for productivity evaluation, and it is impossible to try a variety of gas well working systems to obtain effective gas well productivity; reservoir numerical simulation is the most economical productivity prediction and evaluation method, but numerical The premise of the simulation is that there must be real production data for diachronic fitting, and the construction of a reservoir model that is most in line with the real situation has the following disadvantages: (1) It is impossible to evaluate the coalbed methane production capacity of new blocks, even if there is a certain production test data, but whether these data are representative is still worth considering; (2) Reservoir simulation has multiple solutions, the same set of production data may generate different reservoir models through historical fitting, making the accuracy of numerical simulation Can not guarantee

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