东海低渗气藏射孔完井直井产能计算方法  

Productivity calculation method for perforated completion vertical wells in low permeability gas reservoirs in the East China Sea

作　　者：唐健程 Tang Jiancheng(CNOOC(China)Limited Shanghai Branch,Shanghai 200335)

机构地区：[1]中海石油(中国)有限公司上海分公司,上海200335

出　　处：《石化技术》2023年第5期181-183,共3页Petrochemical Industry Technology

基　　金：中国海洋石油集团有限公司十四五重大科技项目“弧后盆地深层/超深层油气成藏条件与成藏机制研究-西湖凹陷”(KJGG2022-0402)。

摘　　要：低渗气藏渗流机理复杂,东海低渗气藏开发多选用套管射孔方法进行完井。充分考虑启动压力梯度、气体滑脱效应、应力敏感效应以及高速非达西等渗流特征及各种射孔参数的影响,应用等值渗流阻力法,形成了适用于海上低渗气藏的产能计算方法。对参数选取进行了敏感性分析,认为:产能对射孔深度、射孔直径、射孔密度、相位角的敏感性依次降低,对应力敏感效应、启动压力梯度、滑脱效应的敏感性依次降低。实例计算结果表明该计算方法的误差在10%以内,准确度较高。The percolation mechanism of low permeability gas reservoirs is complex,and the casing perforation method is often used for completion in the development of low permeability gas reservoirs in the East China Sea.Taking full account of the start-up pressure gradient,gas slippage effect,stress sensitivity effect,high-speed non-Darcy and other percolation characteristics and the impact of various perforation parameters,the equivalent percolation resistance method is applied,forming a productivity calculation method suitable for offshore lowpermeability gas reservoirs.The sensitivity analysis of parameter selection shows that the sensitivity of productivity to perforation depth,perforation diameter,perforation density and phase angle decreases in turn,and the sensitivity to stress sensitivity effect,start-up pressure gradient and slippage effect decreases in turn.The calculation results of an example show that the error of the calculation method is within 10%and the accuracy is high.

关 键 词：低渗气藏 产能方程 应力敏感 等值渗流阻力法 射孔直井 

分 类 号：TE328[石油与天然气工程—油气田开发工程]