一种用于多级压裂水平井判别来水方向的多井干扰压力分析方法  

A multi-well interference pressure transient analysis method to determine the water source orientation of multi-fractured horizontal well

作　　者：程时清[1] 李猛[1] 何佑伟 吕亿明 崔文浩[2,3] 陈建文 段晓宸 吴德志 CHENG Shiqing;LI Meng;HE Youwei;Lü Yiming;CUI Wenhao;CHEN Jianwen;DUAN Xiaochen;WU Dezhi(State Key Laboratory of Petroleum Resources and Engineering in China University of Petroleum(Beijing), Beijing 102249,China;Oil and Gas Research Institute of Changqing Oilfield Company,Xi an 710021,China;State Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields,Xi an 710021,China;12th Oil Production Plant of Changqing Oilfield Company,Xi an 710021,China)

机构地区：[1]中国石油大学(北京)油气资源与工程国家重点实验室,北京102249 [2]长庆油田公司油气院,陕西西安710021 [3]低渗透油气田勘探开发国家工程实验室,陕西西安710021 [4]长庆油田公司采油十二厂,陕西西安710021

出　　处：《中国石油大学学报（自然科学版）》2018年第5期81-88,共8页Journal of China University of Petroleum(Edition of Natural Science)

基　　金："十三五"国家科技重大专项(2017ZX05009-003)

摘　　要：为了确定直井注水、水平井采油的联合井网井间连通情况,建立考虑裂缝非均匀产液的多级压裂水平井多井干扰试井解释模型,运用Green函数、Newman乘积法得到井底压力解,绘制无量纲压力和压力导数典型曲线图版,进行参数敏感性分析。多级压裂水平井多井干扰试井模型典型曲线划分为7个流动阶段,其中在系统干扰流阶段,压力导数曲线下降,且注水井的注水量越大,其下降程度越大,当周围注水井的总注水量小于多级压裂水平井产量时,压力导数曲线呈阶梯状下降特征,最终表现为一条水平直线段,当周围注水井的总注水量大于观测井产量时,压力导数曲线将一直下降,呈现下掉特征;注水井到多级压裂水平井的距离越近,系统干扰流阶段持续的时间越长。实例应用表明,提出的模型能够确定注采井间连通情况、判别多级压裂水平井来水方向,指导油田开发措施的制定。In order to determine the connectivity between injection wells and multi-fractured horizontal well(MFHW)accurately,a multi-well interference pressure transient analysis(MWIPTA)model was developed in this study,in which the effects of unequal liquid-production rate of fractures and the interferences from adjacent injection wells on pressure-transient behaviors were considered.The solutions of the model in terms of pressure drop were derived on the basis of the Green function and a Newman product method,and the characterization curves of bottomhole pressure were figured out along with a sensitivity analysis of important influencing factors.A typical MWIPTA curve can be divided into several flow regimes.In the interference flow regime,the pressure derivative curve will descend and higher injecting rate of the adjacent active wells can cause greater decline on the pressure derivative curve.When the total injection of the adjacent wells is smaller than the production of the MFHW,the pressure derivative curve will descend in a stepwise manner.When the total injection of the adjacent wells is bigger than the production of the MFHW,the pressure derivative curve will descend all the time.In addition,the closer distance between the MFHW and the adjacent injection wells,the longer interference flow regime will last.The results of a case study show that the model can be used to determine the connections between the injection wells and the MFHW and identify the water source orientation of the MFHW accurately,which can provide guidelines for increasing oil production of the MFHW.

关 键 词：多级压裂水平井 非均匀产液 多井干扰试井 井间连通情况 来水方向 

分 类 号：TE357[石油与天然气工程—油气田开发工程]