天然气勘探与开发2025，Vol.48Issue(2)：58-68,11.DOI:10.12055/gaskk.issn.1673-3177.2025.02.006
异常高压气藏"一点法"产能评价公式的建立
Establishment of"one point method"productivity evaluation formula for overpressured gas reservoirs
摘要
Abstract
Based on the Al-Hussainy productivity equation in pseudo-pressure form,the critical pressure turning point of overpressured gas reservoirs was determined using the μZ-p and p/μZ-p plots,subsequently,the"one point method"productivity evaluation formula in pressure form for overpressured gas reservoirs was derived and established.Research results indicate that,(i)the pressure coefficients of typical overpressured gas reservoirs in China range from 1.34 to 2.29,and the initial formation pressures range from 49.28 to 150.00 MPa;(ii)based on the pressure-volume-temperature(PVT)parameters of 18 typical overpressured gas reservoirs at home and abroad,the critical pressure turning point of such reservoirs is determined to be 53.00 MPa;(iii)when the pressure of an overpressured gas reservoir exceeds 53.00 MPa,μZ and p are approximately linearly related,and p/μZ is approximately constant;in this case,the pressure binomial productivity equation should be used for solution;(iv)the established productivity evaluation formula is similar to the Chen Yuanqian's"one point method"formula,with the distinction that the productivity equation coefficients and the absolute open flow(qAOF)of gas well in the former are solved with the pressure binomial productivity equation;and(v)without the multi-point test,the stable empirical coefficient α'for gas well is unknown;if the average value of α'(i.e.0.164 4)is utilized,there may exist an uncertainty.It is concluded that from the theoretical perspective,the proposed"one point method"formula in pressure form is more suitable for overpressured gas reservoirs.The application results show that the established productivity evaluation formula has an average error of 49.16%in calculating the qAOF,which is lower as compared with the Chen Yuanqian's"one point method"formula.关键词
异常高压气藏/压力临界拐点/"一点法"/产能/稳定经验数/气井绝对无阻流量Key words
Overpressured gas reservoir/Critical pressure turning point/"One point method"/Productivity/Stable empirical coefficient/Absolute open flow of gas well引用本文复制引用
蔡珺君,刘微,周芳芳,陈春竺..异常高压气藏"一点法"产能评价公式的建立[J].天然气勘探与开发,2025,48(2):58-68,11.基金项目
中国石油天然气集团有限公司科技项目(编号:2023ZZ16-03). （编号:2023ZZ16-03）
