堵/调/驱组合方式和井网类型对调剖调驱效果的影响*

Influence of Plugging/Adjusting/Flooding Combination Mode and Well Pattern Type on the Effect of Profile Control and Displacement

刘义刚 张云宝 李彦阅 卢祥国 曹伟佳 张 楠 何 欣

LIU Yigang ZHANG Yunbao LI Yanyue LU Xiangguo CAO Weijia ZHANG Nan HE Xin

渤海LD5-2油田储层具有厚度大、平均渗透率高、非均质性强、注采井距大、单井注采强度高和原油黏度高 等特点，长期注水开发进一步加剧了储层非均质性，水驱开发无效循环现象日趋严重。为了提高油田开发效果， 开展了堵/调/驱组合方式和井网类型对调剖调驱效果影响的研究。结果表明，由部分水解聚丙烯酰胺溶液与有 机铬交联剂组成的调剖剂静置12 h后，最大黏度高于105 mPa·s，30 d时仍能保持较高强度。调驱剂聚合物微球 初始粒径8.7~ 9.2 μm，膨胀倍数3.7~ 4.1。驱油剂表面活性剂溶液与原油间的界面张力可达10-2 mN/m，当乳状 液含水率大于40%时的稠油乳化降黏率超过80%。相比调剖剂+调驱剂+驱油剂组合，调剖剂+调驱剂组合因缺 少表面活性剂的乳化降黏和洗油作用，采收率增幅减小8.9%。调驱剂+驱油剂组合的宏观液流转向效果较差， 表面活性剂乳化降黏作用未能充分发挥，采收率增幅仅为10.8%。4种井网类型的调剖调驱效果从强到弱依次 为：1水平井（注）+1水平井（采）、1水平井+2垂直井、1垂直井+1水平井、1垂直井+2垂直井。当储层平均渗透率 较高和非均质性较强时，大孔道或特高渗透条带治理措施可以确保后续微球发挥微观液流转向、表面活性剂发 挥乳化降黏和洗油作用。图12表4参17

Bohai LD5-2 oilfield reservoir has the characteristics of large thickness， high average permeability， strong heterogeneity，large injection-production well spacing，high single-well injection-production intensity and high crude oil viscosity. Long-term water flooding development has further aggravated the heterogeneity of the reservoir，and the phenomenon of invalid cycles of water flooding development has become increasingly serious. In order to improve the effect of oilfield development，the effect of plugging/modulation/displacement combination and well pattern type on the effect of profile control and flooding was carried out. The results showed that the maximum viscosity of profile control agent composed of partially hydrolyzed polyacrylamide solution and organic chromium crosslinking agent reached 105 mPa·s after standing for 12 hours. It could still maintain high strength after 30 days. The initial particle size of displacement control agent，namely polymer microsphere was 8.7— 9.2 μm，and the expansion ratio was 3.7—4.1. The interfacial tension between surfactant solution and crude oil could reach 10-2 mN/ m. The viscosity reduction rate of heavy oil emulsification exceeded 80% when the water content of emulsion was greater than 40%. Compared with the combination of profile control agent，displacement control agent and surfactant，the combination of profile control agent and displacement control agent lacked the emulsification and viscosity reduction and oil washing effects of surfactants，the enhanced oil recovery rate reduced 8.9%. The macroscopic flow diversion effect of the combination of displacement control agent and surfactant was poor，the emulsification and viscosity reduction effect of the surfactant was not fully exerted，so that the enhanced oil recovery rate only reached 10.8%. The four well pattern types were arranged according to the development effects in following order：1 horizontal well（injection）+ 1 horizontal well（production），1 horizontal well + 2 vertical wells，1 vertical well + 1 horizontal well，and 1 vertical well + 2 vertical wells. When the average permeability of reservoir was high and the heterogeneity was strong，the treatment measures of large pores or ultra-high permeability strips could ensure that the subsequent microspheres performed microscopic liquid flow diversion，and the surfactants played the role of emulsification，viscosity reduction and oil washing.

10.19346/j.cnki.1000-4092.2020.03.008