Abstract: In the low-permeability reservoirs of Sulige Gas Field, aiming at the problem of unclear understanding of critical liquid-carrying parameters in the wellbore of gas wells with restrictor, a pressure distribution model for gas-liquid two-phase flow in gas wells with restrictor was established, and the applicability of four types of critical liquid-carrying models were analyzed. The distribution law of critical liquid-carrying parameters along the depth of gas wells with restrictor was summarized. The research show that: Turner, Coleman, and Peng Zhaomin models are suitable for judging whether the gas wells in Sulige Gas Field have fluid accumulation; the critical fluid-carrying rate of gas wells with restrictor continues to decrease with the increase of well depth, with a sudden drop around the position of the restrictor and a minimum value around the bottom of gas wells; above the restrictor, the critical fluid-carrying volume continues to decrease with the increase of well depth, while below the restrictor, the critical fluid-carrying volume keeps increasing, and the maximum value appears around the wellhead. It is recommended to take the quotient of the integral and the well depth as the final value of critical liquid-carrying volume, where the integral is from the distribution of critical liquid-carrying volume along well depth. This research has a guiding significance for improving the application effect of the critical liquid-carrying model and for stabilizing production of gas wells.

Key words: critical liquid-carrying parameter, low-permeability gas reservoir, turner model, restrictor, Sulige Gas Field