第33卷第4期 2016年7月
钻井液与完井液
DRILLINGFLUID&COMPLETIONFLUID
doi:10.3696/j.issn.1001-5620.2016.04.021
泥灰岩致密油自转向酸体系
Vol. 33 No.4 July2016
段贵府，沈华2，何春明'，程晓东2，余芳3，穆海林3，安岳鹏4
（1.中国石油勘探开发研究院廊坊分院，河北廊坊065007；2.中国石油华北油田分公司，河北任丘062552；
3.中国石油潮海钻探工程有限公司井下作业分公司，河北任丘062552；4.渤海钻探定向井技术服务分公司，河北任丘062552）段贵府等，泥灰岩致密油转向酸体系[]].钻井液与完井液，2016，33（4）：101-104.
摘要为解决束鹿凹陷泥灰岩致密油储层以往改造中面临施工压力高、改造距离短和导流能力低的难点，根据泥灰岩酸岩反应特征，优化了自转向酸体系配方，开展了转向酸体系黏度性能、流变性能及破胶性能评价。利用岩心流动实验方法，研究了酸液对裂缝网络的沟通作用，明确酸液体系与施工参数对酸蚀裂缝网络的影响。实验结果表明，自转向酸具有低伤害、易破胶和易均匀布酸的优点，
残酸浓度降低到5%时黏度可达到96mPa·s；酸液能够实现侧向对天然裂缝的大幅度沟
通，满足泥灰岩储层改遗的要求。对比不同改造工艺下裂缝导流能力，形成一套适合泥灰岩储层的转向酸压与加砂压裂复合的体积改造模式，该技术在ST1H井等3口井15段中综合应用，稳定日产量是以往的10倍。
关键调泥灰岩；自转向酸；天然裂缝；网络裂缝；导流能力
中图分类号：TE357.2
文献标识码：A
文章编号：1001-5620（2016）04-0101-04
Diverting Acid Used for Acidizing Tight Marlstone Reservoir
DUAN Guifu',SHEN Hua, HE Chunming,CHENG Xiaodong",YU Fang",MU Hailin',ANYuepeng
(1.Langfang Branch of PetroChina Research Institution of Petroleum Exploration andDevelopment, Langfang,Hebei 065007; 2. PetroChina Huabei Oifield Company, Renqiu, Hebei 062552; 3. Downhole Services Company BHDC, Renqiu, Hebei 062552
4.DirectionalDrillingServiceCompany,BHDC,Renqiu,Hebei062552)
Abstract In improving the tight marlstone reservoir in Shulu sag, problems such as high operation pressure, short improving distance and low conductivity have been frequently encountered. A newself-diverting acid formulation was developed for use in stimulation jobs to try to solve the problems as described above. Evaluation of the viscosity, elasticity, rheological and gel-breaking performances of the self-diverting acids was performed through laboratory experiment. Communicating of fractures in the reservoir formations by acids was conducted through core flow experiment. The evaluation demonstrates that the self-diverting acid causes low damage to reservoir formations, the gels are easy to break, and the acid is evenly distributed. When the residue acid had its concentration decreased to 5%, the viscosity of the acid can be 96 mPa · s. The acid can go laterally to make the natural fractures communicated extensively, satisfying the needs to improve the marlstone reservoir. Comparison of the conductivities of the fractures using different improvement techniques resulted in a volumetric stimulation model suitable for marlstone reservoir improvement, a model integrating diverting acid fracturing and fracturing with sand. This technology has been used in the improvement of three wells (15 segments), obtaining stablc daily production rate that is 10 times of the old wells
Key words Marlstone; Self-diverting acid; Natural fracture; Network fractures; Conductivity
渤海湾盆地的束鹿凹陷位于冀中坳陷南部，是在前第三系基底上发育的东断西超的单断箕状凹陷。束鹿凹陷泥灰岩致密油储层具有亿吨级储量，是渤海湾地区油气接替的新领域-2]。束鹿凹陷泥
灰岩致密油储层具有埋藏深、岩性复杂、地应力高天然裂缝发育以及酸岩反应速率高等特点，造成储层改造中面临施工压力高、工作液滤失量大、砂堵风险高和改造距离短等技术难题(3-4)。该区域在早
基金项目：中石油科技重大专项“特低、超低渗油藏高效改造新技术研究"（2014B-1202)。
第一作者简介：段贵府，助理工程师，硕士研究生，2015年毕业于中国科学院大学化学工程专业，主要从事储层改
造理论与工艺技术研究工作。电话（010）69213433；E-mail：dgf1989@163.com。万方数据