Test device for evaluating well completion manner of coal bed methane

Abstract

The invention relates to a test device for evaluating a well completion manner of coal bed methane. The test device comprises a well completion manner simulation model system which is arranged in a constant-temperature box; the well completion manner simulation model system consists of a core holder and a well completion model which is arranged in the core holder; the core holder comprises a metal cylinder with both sealed ends; a gas-liquid inlet is arranged at one sealed end of the metal cylinder, and a gas-liquid outlet is arranged at the other sealed end of the metal cylinder; a cylindrical rubber sleeve with both opened ends is sleeved in the metal cylinder; the well completion model comprises a cylindrical raw coal core which is arranged in the cylindrical rubber sleeve; a well completion simulation sheet provided with a through cutting seam or a through hole is adhered to the end face opposite to the gas-liquid outlet of the raw coal core; a gas-liquid pressurized injection system and an inlet pressure sensor are connected with the gas-liquid inlet of the core holder; the gas-liquid outlet is connected with a coal powder collecting and metering system and an outlet pressuresensor; and the core holder is connected with a loading device which is used for loading a confining pressure to the well completion model inside the metal cylinder.

Description

technical field [0001] The invention relates to a well completion simulation experiment system, in particular to an evaluation experiment device for coalbed methane well completion mode. Background technique [0002] At present, the CBM completion methods in my country are relatively single, and most CBM wells still use the completion methods of conventional oil and gas wells. There is a lack of theoretical basis for the selection of CBM completion methods, and a lack of applicability analysis of different completion methods. Different well completion methods are evaluated according to the reservoir conditions of coalbed methane reservoirs, so it is impossible to optimize the completion methods of coalbed methane reservoirs. Therefore, it is necessary to carry out research on the basic theory of coalbed methane well completion methods, and on this basis, form an evaluation system suitable for the selection of coalbed methane well completion methods, so as to improve the scien...

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Problems solved by technology

[0004] However, when CBM wells adopt different completion methods, the seepage characteristics of the wellbore wall of CBM wells will change, and the gas production, liquid production, pulverized coal output and particle size will also change accordingly; while the existing reservoir coal rock The permeability measurement device is just an ordinary coal-rock permeability measurement device, which cannot be associated with the evaluation and optimization of coalbed methane well completion methods, and cannot provide useful data for the optimization of coalbed methane well completion methods, so it cannot be used for coalbed methane well completion methods. way to evaluate

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