On-line monitoring method and monitoring device for pulverized coal concentration in coalbed gas well output liquid

Abstract

The invention discloses a method and device for online monitoring the pulverized coal concentration of coal-bed gas well output liquid.The method includes the steps that a static stratum water density temperature revised value is determined; a flow stratum water density flow revised value is determined; the density of the output liquid under the flow condition is measured; the density of the output liquid under the static condition is calculated and revised; the pulverized coal concentration of a coal-bed gas well stratum is determined.The monitoring device comprises a pulverized coal concentration measuring unit and a measuring information processing unit.The pulverized coal concentration measuring unit comprises a gas-liquid separation tank, an output opening of the gas-liquid separation tank is connected with a density sensor and a flow sensor, a liquid outflow pipe is provided with a temperature sensor, and a liquid outlet of the density sensor is connected with a blow-off pipe.The measuring information processing unit comprises a data acquisition module, a data processing module and a wireless data transmitting module.Labor cost can be reduced, monitoring precision can be improved, online monitoring of pulverized coal concentration of the coal-bed gas well output liquid is achieved, and the method and device are suitable for exploiting a coal-bed gas well.

Description

technical field [0001] The invention relates to a monitoring method and a monitoring device, in particular to an on-line monitoring method and a monitoring device for the concentration of pulverized coal in the output liquid of a coalbed gas well. Background technique [0002] Coalbed methane wells are exploited by reducing reservoir pressure through long-term drainage and depressurization. During the drainage process, coalbed methane wells are accompanied by pulverized coal output. At present, rod pumps, screw pumps and electric submersible pumps are mainly used in my country to realize drainage and gas recovery. The three drainage methods can withstand the maximum coal powder concentration between 3.0% and 8.0%. Generally, fine particle coal powder is in the form of suspension Carried to the ground, the excessive accumulation of medium-coarse and relatively coarse-grained pulverized coal blocks the suction port of the pump, and the excessive concentration of pulverized coal...

AI Technical Summary

Problems solved by technology

The device can actually monitor the pulverized coal content contained in the produced water during the drainage of coalbed methane wells. Net drying treatment does not realize the online monitoring of pulverized coal content in the true sense. At the same time, the measured pulverized coal content is the value of flow conditions. In order to correct the pulverized coal content value under static conditions, the accuracy is lost to a certain extent

Images