河南油田高温油藏梳形聚合物调剖性能评价

The Profile Controlling Performance of Comb-Shaped Polymer in High-Temperature Oil Deposit of Henan Oilfield

针对河南油田赵凹区油藏温度90率118℃,筛选出调剖剂配方：1.5g/L梳形聚合物KY-6＋15g/L醛交联剂,其最佳成胶温度约90℃,可耐温110℃,抗盐20g/L;90℃成胶后放置90d的黏度保留率大于80%;储能模量G＇〉10Pa,属于强凝胶。物理模拟实验研究表明,调剖剂在岩心中的封堵率大于96%,经水冲刷后的封堵率保留率大于99%;以注入量0.3PV、前置段塞＋主体段塞＋后置段塞的方式对单管填砂管进行驱油实验,采收率增幅达15.91%;双管并联岩心调剖后,吸水剖面改善率达88%;高渗层和低渗层分别提高采收率14.13%和19.28%,不同渗透率岩心水驱动用程度得到改善。

According to the high temperature condition in Zhaowa block of Henan oilfield, the optimum formula of polymer cross-linking system was obtained as follows： 1.5 g/L comb polymer KY-6, 15 g/L aldehyde cross-linking agent. The optimum gelation temperature was about 90%. This profile control agent had resistance of temperature 110℃ and salinity 20 g/L. The viscosity retention rate of gel was more than 80% after 90 days at 90℃ gelling temperature. The storage modulus of the gel was above 10 Pa which showed it was strong gel. The physical model results showed that the blocking ratio of the profile control agent in core was more than 96%, and the retention rate of blocking ratio was beyond 99% after water scouting. Sand packed tube model experiment results showed that the increase of oil recovery was up to 15.91%, with 0.3 PV injection and slug combination of lead slug, subject slug and rear slug. Parallel core profile control experiment results showed that the improving rate of injection profile was up to 88% after profile control. Recovery efficiency of high and low permeability layers was improved by 14.13% and 19.28%, respectively. Water driving degree of different permeability core was improved.