裂缝性低渗透碳酸盐岩储层酸压改造油井动态压力特征  

Transient pressure behavior of acid fracturing oil wells in fractured low permeability carbonate reservoir

作　　者：史文洋 姚约东[1,2] 程时清 石志良[3] 高敏 Shi Wen-yang;Yao Yue-dong;Cheng Shi-qing;Shi Zhi-liang;Gao Min(State Key Laboratory of Petroleum Resources and Prospecting ,China University of Petroleum （Beijing）, Beijing 102249 ,China;College of Petroleum Engineering ,China University of Petroleum （Beijing ） ,Beijing 102249 ,China;Petroleum Exploration ＆ Production Research Institute ,SINOPEC ,Beijing 100083 ,China;No.4 Oil Production Plant, PCOC ,Yulin 718500, China)

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [2]中国石油大学(北京)石油工程学院,北京102249 [3]中国石油化工股份有限公司石油勘探开发研究院,北京100083 [4]中国石油股份有限公司长庆油田分公司第四采油厂,陕西榆林718500

出　　处：《天然气地球科学》2018年第4期586-596,共11页Natural Gas Geoscience

基　　金："十三五"国家科技重大专项"复杂结构井丛式井井网及产能设计研究"(编号:2017ZX05009-003)资助

摘　　要：裂缝性低渗透碳酸盐岩储层具有基质低孔隙度低渗透率、天然裂缝和溶蚀孔洞发育的三重介质特征。在考虑基质低速非达西渗流和裂缝应力敏感特征的基础上,针对裂缝性低渗透碳酸盐岩储层酸压改造油井建立了动态压力响应模型。利用对数变换和摄动法得到考虑井筒储集效应和表皮效应的实空间井底压力解,并绘制了典型图版,同时讨论了基质非达西渗流、裂缝应力敏感大小、储层物性改造强弱、储层流道改造程度、酸压改造范围等参数对动态压力响应的影响。结果表明:基质低速非达西程度越强压力及压力导数曲线上翘越明显,裂缝应力敏感性越大压力及压力导数曲线向上弯曲越剧烈。模型可用于裂缝性低渗透碳酸盐岩类油藏油井酸压改造效果评价和不稳定产能分析,得到的酸压有效改造面积和酸压改造程度对油井后期酸化解堵、重复酸压等增产措施具有重要的指导意义。Fractured low permeability carbonate reservoirs are triple porosity media with low porosity and low permeability,but there are natural dissolved vugs and natural fractures in the reservoir rock.Consider- ing low speed non-Darcy seepage in reservoir rocks and stress sensitivity of natural fractures and acid frac- turing fractures,a transient pressure behavior model of acid fracturing oil well in fractured low permeabili-ty carbonate reservoirs is established.Using logarithmic transformation and perturbation method,the tran- sient pressure solution of real space is obtained, further, it analyzes the effect of low speed non-Darcy in reservoir rock, stress sensitivity of fractures, rock property improvement degree, flow channel improvement degree,acid fracturing area. The result shows the more obvious the low speed non-Darcy flow and stress sensitivity is,the more warping and bending the type curve is.The model can be used to evaluate the effect of the acid fracturing and evaluation of unstable productivity on carbonate reservoirs, identification and judgment of acid fracturing area and acid fracturing degree is of guiding significance to oil well increasing production measures, such as repeated fracturing, acidification and plugging, in fractured low permeability carbonate reservoirs.

关 键 词：裂缝性碳酸盐岩 低渗透碳酸盐岩 酸化压裂 低速非达西渗流 应力敏感 动态压力 

分 类 号：TE357[石油与天然气工程—油气田开发工程]