大剂量深部调驱技术在小集“双高”油田的应用

针对小集油田官979断块"双高"开发阶段地质及剩余油分布特点,研究了耐高温的连续凝胶及SMG微球凝胶的基本物理化学特性。结果表明,实验所优选的HPAM与交联剂KN所形成的凝胶在113℃下可以长期稳定,黏度基本保持不变,达到100 000mPa·s,且在渗透率为3.0μm2的岩心中的残余阻力系数可以达到20以上,具有很好的封堵性能。SMG微球在120℃下可以稳定存在,且高温溶胀后粒径明显变大,可以对高渗管产生封堵,使后续注入液转向低渗层,从而提高采收率。将优选出的适用于高温油藏的KN高温连续凝胶及SMG微球凝胶开展大剂量深部调驱试验,并对层系、井网、注入体积、段塞结构等进行研究优化,结合现场及时的优化调整,整个断块实施大剂量深部调驱后注水指标和开发效果都得到了明显改善,截止到2013年6月,14口调驱受益油井,见效13口,纯增油9 500t。

Application of High Dose Deep Profile Control Technology in High Water Cut and High Recovery Percent Reservoir of Xiaoj i Oilfield

After 30 years of water flood development,G979 block of Xiaoji oilfield has entered high water cut and high recovery percent development period,and the remaining oil is highly scattered.In this situation,the basic physical and chemical properties of KN corss-linked polymer and SMG microsphere gel for high temperature reservoir were studied.The results showed that the gel synthesized by HPAM （hydrolyzed polyacrylamide）and KN crosslinking agent could be long-time stable with constant viscosity of 100 000 mPa＆#183;s at 113 ℃.And the residual resistance factor of it in core with permeability of 3.0μm2 reached to above 20,exhibiting good plugging performance.SMG microspheres could resist 120 ℃ and their sizes increased obviously due to swelling at high temperature,which tended to plug the high permeability and would change the direction of the inj ected water during the follow-up water flooding stage,with the ultimate purpose of enhancing oil recovery. The KN corss-linked polymer and SMG microsphere gel for high temperature reservoir were optimized for the deep profile control test.Meanwhile the formation,well pattern,inj ected volume,plug structure were studied and optimized,combining with the adjustment of injection parameters on time.After large dose deep profile control applied in G979 block,the development effect and the water injection indexes have been significantly improved.Until June 2013,13 wells out of corresponding 14 wells have taken effect and the increasing oil amount 9 500 t.