气井高速非达西效应主控因素分析

Investigation of Dominant Factors Influencing High-speed Non-Darcy Effect in Gas Wells

汪洋 王彬 罗建新 赵传凯 石磊

WANGYang WANGBin LUOJianxin ZHAOChuankai SHILei

中国石油新疆油田分公司勘探开发研究院, 新疆 克拉玛依 834000 西南石油大学石油与天然气工程学院, 四川 成都 610500

Research Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China Petroleum Engineering School, Southwest Petroleum University, Chengdu, Sichuan 610500, China

气藏开发实践表明，高速非达西效应对气井产能有着重要影响，不同的气藏，高速非达西效应的影响程度是不同的。对于地层压力较低的气藏，当气井产量较高时，高速非达西效应表现比较强；而对于地层压力较高的气藏，相同的气井产量，高速非达西效应可能并不强。其原因在于气体在较高的地层压力下压缩程度很强，密度、黏度更大，天然气的渗流速度更低，高速非达西效应更弱。根据气井产能方程和雷诺数方程，从气井产量、储层物性和气体性质等方面对影响非达西效应的主要因素进行了敏感性研究，基于临界雷诺数得到了达西和非达西渗流界限，建立了天然气达西渗流图版。通过该图版，可以明确非达西效应的强弱，进而为确定气井配产上限提供指导。

Practice in gas reservoir development has shown that the high-speed non-Darcy effect has a significant impact on gas well productivity. However, the degree to which high-speed non-Darcy effects impact different gas reservoirs varies. For gas reservoirs with lower pressures, the high-speed non-Darcy effect becomes more pronounced with increasing gas well production rate. For gas reservoirs with higher pressures, the same level of gas well production rate may not cause strong high-speed non-Darcy effects due to the strong gas compression, higher density, viscosity, and lower natural gas seepage speed under higher formation pressure. Sensitivity analysis of the primary factors influencing non-Darcy effects is conducted based on the gas well productivity equation and Reynolds number equation, including reservoir properties and gas properties. The Darcy/non-Darcy flow boundary is established based on the critical Reynolds number, and a Darcy flow chart is created for natural gas. The chart can be used to determine the strength of non-Darcy effects and provide guidance for setting production constraints for gas wells.

10.11885/j.issn.1674-5086.2022.06.10.01