川西须家河组第二段深层致密气藏多层合采井产量递减劈分模型  

Production decline split model for multicompletion well in deep tight gas reservoir of the second member of Xujiahe Formation,western Sichuan Basin,China

作　　者：詹泽东[1,2,3] 郭科[3] 詹国卫 黎华继 胥德平[3] ZHAN Zedong;GUO Ke;ZHAN Guowei;LI Huaji;XU Deping(Southwest Oil&Gas Company,SINOPEC,Chengdu 610041,China;College of Geophysics,Chengdu University of Technology,Chengdu 610059,China;Key Laboratory of Geomathematics of Sichuan Province,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]中国石油化工股份有限公司西南油气分公司,成都610041 [2]成都理工大学地球物理学院,成都610059 [3]成都理工大学数学地质四川省重点实验室,成都610059

出　　处：《成都理工大学学报（自然科学版）》2022年第4期468-473,490,共7页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家科技重大专项(2016ZX05048004)。

摘　　要：开展深层致密气藏气井产量递减模型研究,探索多层合采井产量劈分方法。通过对川西地区上三叠统须家河组第二段气井开展递减模型诊断,明确了深层致密气藏单层井产量递减遵循Arps递减模型且多层合采井产量递减出现“拐点效应”,同时递减指数普遍大于1的特征;进而以Arps递减模型为基础,建立了深层致密气藏多层合采井产量劈分数学模型;理论推导表明,新模型具有“产量加权”“瞬时递减率”“瞬时递减指数”三大效应,满足四大守恒方程;在此基础上,利用四大守恒方程建立了最优化模型参数求解方法。将新模型应用于开发实践,一方面可以利用“拐点效应”进行气井多层合采状态判别与正演气井产量递减响应特征分析,另一方面可有效劈分多层合采井各产层段的产量。The deep tight gas reservoir of the second member of Xujiahe Formation of Upper Triassic in western Sichuan is taken as the research object,and the Arps decline model is used as the theoretical basis to explore a new mathematical model and method of splitting production of multicompletion wells in deep tight gas reservoir.Diagnosis of the decline model of the second member of Xujiahe Formation gas well in the western Sichuan basin shows that the production decline of the deep tight gas reservoir follows the Arps decline model,and the production decline of the multicompletion well displays“inflection point effect”,and the decline index is generally greater than 1.Based on the Arps decline model,the production split fraction model of multicompletion well in deep tight gas reservoir is established.Theoretical derivation shows that the new model has three effects of“yield weighting”,“instantaneous decline rate”and“instantaneous decline index”,and satisfies four conservation equations.On this basis,the optimization model parameter solution method is established by using the four conservation equations.By applying the new model to the development practice,the“inflection point effect”can be used to distinguish the multicompletion state of gas wells and analyze the production decline response characteristics of forward modeling gas wells.Meanwhile,the production of each producing interval of multicompletion wells can be effectively splitted.

关 键 词：多层合采 须家河组 递减模型 产量劈分 储量评价 

分 类 号：TE32[石油与天然气工程—油气田开发工程]