Exploitation measuring device and method of coal bed gas well

Abstract

The invention provides an automatic exploitation measuring device and control method of a coal bed gas well. The measuring and control method is used for controlling a working fluid level by controlling the casing pressure of the coal bed gas well so as to stop the using of a traditional gas-liquid separator on the gas well field; requirements on gas production rate measurement can be satisfied by using a gas flowmeter; meanwhile, the liquid is separated from solid-phase coal powder and a gas after produced to the ground and before passing through a liquid flowmeter, thus the measuring accuracy is improved; the measurement is realized and the measuring accuracy is also increased while the liquid production rate is very small. A produced liquid measuring device, a produced gas measuring device and a control box provided by the invention are respectively mounted on a base bracket to form a highly integrated automatic exploitation measuring and control system of the coal bed gas well; therefore, the parameters are measured and field equipments on the well field are also simplified; the device is very simple and convenient to move, mount, operate, use and maintain; moreover, the invention also provides an optimized exploitation control method of a coal bed gas well.

Description

technical field [0001] The invention belongs to a coalbed gas well drainage measuring device and method, in particular to a measuring device and a measuring method for measuring the output fluid of a coalbed gas well. Background technique [0002] Although people have realized the automatic measurement of production parameters such as gas output, liquid output, bottom hole pressure, casing pressure, power parameters and motor operating parameters of coalbed methane wells, the existing automatic measurement and on-site control system The main problems that exist are: [0003] Measurement method of gas production: At present, gas flowmeters are used in coalbed methane wells to realize automatic measurement of gas production, and the measurement data is transmitted to the control system through the data transmission function of the gas flowmeter. The initial daily gas production of most wells is 100-300 standard cubic meters. The usual practice is to install a flowmeter with a...

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Problems solved by technology

[0009] Based on the above problems, it is easy to find that there are many aspects to be improved in the current measurement and control system, including the possibility of increasing the equipment cost to varying degrees, or difficult operation, or inaccurate measurement, or occupying a large area, etc. These problems will cause people to misjudge the production status of coalbed methane wells, which will easily cause irreparable major economic losses

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