In this paper the authors have put forward the concept of annular zero gas flow and developed the residual gas model, considering the parameters of gas solubility, slippage, and the oil-based drilling fluid volume coefficient [1-3]. The calculation results show that in the process of continuous gas influx at the bottom of the well, the phenomenon of annular zero gas flow can be defined in terms of gas solubility [4-6]. The increase in the back pressure, the decrease in the gas invasion rate, and the decrease in the oil-based ratio can cause an increase in the length of the annular zero gas flow well section. When the back pressure increases from 0.1 to 4.0 MPa, the length of the annular zero gas flow section increases from 1000 to 2700 m. If the zero gas flow is not taken into consideration, the maximum error of the annular void ratio is 21.22% [7-10]. When the CO2, gas invades the bottom of the well, the oil-based ratio increases from 0.1 to 5, the length of the annular zero gas flow section increases from 1500 to 2250 m, and the maximum error of the annular void ratio is 26.57%.

中文翻译：

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MPD操作中气体溶解度对零气体流量特性的影响

在本文中，作者提出了环空零气流量的概念，并开发了剩余气模型，考虑了气体溶解度、滑移和油基钻井液体积系数等参数[1-3]。计算结果表明，在井底气体连续涌入过程中，可以用气体溶解度来定义环空零气流现象[4-6]。背压升高、气体侵入率降低、油基比降低会导致环形零气流井段长度增加。当背压从 0.1 增加到 4.0 MPa 时，环形零气流段长度从 1000 m 增加到 2700 m。如果不考虑零气流量，环形空隙率的最大误差为21。22% [7-10]。当CO2、气体侵入井底时，油基比从0.1增加到5，环空零气流段长度从1500增加到2250m，环空比最大误差为26.57 %。