摘要
采用邻井干扰试井方法,可以克服周围邻井的影响。考虑应力敏感效应和启动压力梯度,建立双重介质低渗油藏邻井干扰试井数学模型;运用Pedrosa代换、正则摄动理论消除方程非线性,应用格林函数和叠加原理求解拉式空间下的井底压力,通过数值反演得到真实空间下的井底压力响应,对相关参数进行敏感性分析。结果表明:受邻井的干扰,测试井压力导数曲线出现两个径向流段,且两个径向流段高度比等于两口井总产量与测试井产量比;考虑应力敏感效应和启动压力梯度时,压力导数曲线后期大幅上翘。该试井模型在低渗致密储层试井解释中拟合效果好,可以提高试井资料解释准确率,为低渗油藏邻井干扰试井解释提供指导。
The interference test method of adjacent wells is widely accepted to overcome the effect of adjacent wells.Considering the effect of stress sensitivity and threshold pressure gradient,the mathematical model of interference well test between adjacent wells in dual medium low permeability reservoir is established.Pedrosa variable substitution and regular perturbation theory are used to eliminate the nonlinearity of the equation.Green’s function and superposition principle are used to solve the bottom hole pressure in pull space.Through numerical inversion,the bottom hole pressure response in real space is obtained.Taking a well around the test well as an example,the parameter sensitivity analysis is carried out.The results show that there are two radial flow sections in the pressure derivative curve of the test well,and the ratio of the height of the two radial flow sections is equal to the ratio of the total production of the two wells and the production of the test well.When the stress sensitive effect and the threshold pressure gradient are considered,the pressure derivative curve will rise significantly in the later stage.This model has a good fitting effect in the well test interpretation of low permeability tight reservoir,obviously improves the accuracy of well test data interpretation,and provides guidance for interference well test interpretation of adjacent wells in low permeability reservoir.
作者
姜瑞忠
高岳
崔永正
毛埝宇
刘秀伟
李盈盈
JIANG Ruizhong;GAO Yue;CUI Yongzheng;MAO Nianyu;LIU Xiuwei;LI Yingying(School of Petroleum Engineering,China University of Petroleum(East China),Qingdao,Shandong 266580,China;School of Electromechanic Engineering,China University of Petroleum(East China),Qingdao,Shandong 266580,China)
出处
《东北石油大学学报》
CAS
北大核心
2020年第1期112-120,I0008,共10页
Journal of Northeast Petroleum University
基金
国家科技重大专项(2016ZX05027-004-004)
国家科技重大专项(2017ZX05013-002)
国家自然科学基金项目(51574265)。
关键词
低渗油藏
邻井干扰
应力敏感效应
启动压力梯度
双重介质
试井模型
low permeability reservoir
interference from adjacent well
stress sensitive effect
starting pressure
dual medium
well test model
