Optimal Design of Improved Drainage and Production Device for Gas Recovery Wells with Foam Drainage

doi:10.3969/j.issn.1006-6535.2022.04.022

Abstract

Abstract: To address the problem of low efficiency of foam drainage and gas recovery technology in gas wells, a gas-foam flow coupling model in wellbore was established based on COMSOL software, and a liquid retention device and a secondary foaming device used in gas recovery wells with foam drainage were optimally designed. It was found in the study that in the wave-shaped retention device, the liquid was stabilized and not be carried downwards by gas, resulting in a relatively stable dynamic system with relatively low flow resistance and strong water storage capacity; foams were generated when the gas entered the liquid through the improved foaming structure, and the foaming performance of pulse trapezoidal foaming device was the best. The laboratory tests were conducted in gas recovery wells with foam drainage to compare and analyze the variation of liquid level in the wellbore with time before and after the improved drainage and recovery device was mounted and to verify the practicality of the improved drainage and recovery device. The improved drainage and recovery device can realize efficient foam drainage and gas recovery, with great significance to the efficient development of natural gas.

Key words: foam, gas recovery with water discharge, enhanced foaming, liquid retention, natural gas

CLC Number:

TE37

Huang Bin, Wang Siqi, Guo Yiwen, Ding Qi, Zhang Lu, Tang Boqiang, Guo Wei, Zou Che. Optimal Design of Improved Drainage and Production Device for Gas Recovery Wells with Foam Drainage[J]. Special Oil & Gas Reservoirs, 2022, 29(4): 156-163.

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