Journal of Petroleum Science and Engineering.
Journal of Petroleum Science and Engineering.

The research article 'Process parameters design method of drainage gas recovery technology in gas-driven pump for coalbed methane production' has been published in the Journal of Petroleum Science and Engineering (Volume 207, December 2021, 109167).

Abstract

The main types of non-rod pumps such as the electrical submarine, piston, and jet pumps often have high discharge capacities. In this paper, the process parameters design method of a new non-rod gas-driven pump is proposed for carrying coal power, low discharge capacity, and low lift height drainage gas recovery in coalbed methane production. The gas-driven pump is driven by high-pressure gas and is mainly composed of a liquid storage chamber, liquid inlet valve, and liquid outlet valve. The change in gas pressure simultaneously opens or closes the liquid inlet and outlet valves, leads the liquid into the pump, and then discharges it. When the pressure of driven gas is below the lower pressure limit, the liquid inlet valve opens to allow the liquid to flow into the pump. When the pressure of driven-gas is above the upper-pressure limit, the liquid outlet valve opens to allow the liquid to drain from the pump. Based on the working mechanism of the gas-driven pump, we established a calculation model for the lower and upper limits of the driven gas pressure where the liquid inlet and outlet valves open respectively. Furthermore, we determined a model to calculate the pressure changes in the high-pressure gas tank on the ground during the drainage process. The engineering application on the pilot test wells shows that the gas-driven pump production system works well in liquid production and is a novel type of drainage gas recovery in coalbed methane production. The new calculation model was established as the solution to this lift processing scheme.

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