老井重复压裂后产能预测新模型及其应用  

A New Productivity Prediction Model for Old Wells After Refracturing and Its Application

作　　者：何浩男 刘誉 宋君 任世君 王洋丽 白延锋 雷琳 HE Haonan;LIU Yu;SONG Jun;REN Shijun;WANG Yangli;BAI Yanfeng;LEI Lin(The 11th Oil Production Plant of PetroChina Changqing Oilfield Branch,Qingyang,Gansu 745000,China;Third Oil Production Plant of PetroChina Qinghai Oilfield Company,Haixi,Qinghai 816400,China;No.1 Oil Production Plant of Pet-roChina Qinghai Oilfield Company,Haixi,Qinghai 816400,China;Huaqing Oil Production Plant of PetroChina Yumen Oil-field Company,Jiuquan,Gansu 735000,China;Laojunmiao Oil Production Plant of PetroChina Yumen Oilfield Company,Ji-uquan,Gansu 735000,China)

机构地区：[1]中国石油长庆油田分公司第十一采油厂 [2]中国石油青海油田分公司采油三厂 [3]中国石油青海油田分公司采油一厂 [4]中国石油玉门油田分公司环庆采油厂 [5]中国石油玉门油田分公司老君庙采油厂

出　　处：《钻采工艺》2023年第1期174-178,共5页Drilling & Production Technology

基　　金：国家科技重大专项“致密砂岩气有效开发评价技术”(编号:2011ZX05013-002)。

摘　　要：致密油藏由于其自然禀赋较差,需要对已压裂过的层段进行二次或更多次压裂,才能维持期望的产量。在重复压裂期间,漏失的部分压裂液会通过渗吸作用将储层中的致密油置换出来,从而提高采收率。目前,考虑渗吸作用对产能影响的研究较少。文章将致密油井控制区域划分为三个渗流区域,基于达西定律,以渗流力学理论为基础,考虑启动压力梯度、重力和毛管力的作用影响,建立了考虑渗吸作用的致密油藏老井重复压裂后产能预测新模型;选取某地区致密油储层10口重复压裂井进行单井产能计算,计算结果与实际生产结果较接近、误差较小;渗吸作用对油井产能影响比较大,渗吸占比在2.97%~12.77%之间,平均值为6.87%。本文研究结果为致密油压裂后产能预测和压裂效果评价提供了参考。Due to its poor natural endowment,tight reservoirs require secondary or more fracturing of fractured intervals to maintain desired production.During refracturing,the tight oil is replaced by the lost fracturing fluid through imbibition,resulting in enhanced tight oil recovery.Currently,there are few studies considering the impact of infiltration on productivity.In this paper,the tight oil well control region is divided into three seepage regions.Based on Darcy's law and the theory of seepage mechanics,a new model for predicting the productivity of old wells in tight oil reservoirs after re fracturing is established considering the effects of starting pressure gradient,gravity,and capillary force;Select 10 refracturing wells in a tight oil reservoir in a certain area for single well productivity calculation,and the calculated results are relatively close to the actual production results,with small error;Infiltration has a significant impact on oil well productivity,with an average of 6.87%,ranging from 2.97% to 12.77%.The results of this study provide a reference for productivity prediction and fracturing effect evaluation of tight oil after fracturing.

关 键 词：老井 重复压裂 致密油 渗吸 毛管力 启动压力梯度 

分 类 号：TE328[石油与天然气工程—油气田开发工程] TE357