论文部分内容阅读
大庆油田已进入特高含水开发阶段,层间、平面矛盾突出,浅调剖可作为分层注水技术的重要补充,但目前常用的调剖剂体系存在成本高、毒性大、现场调控难度大等问题,为此,研制了DY-Ⅱ浅调剖剂。该调剖剂聚合物使用浓度为2000~3000mg/L,聚交比为30∶1~40∶1。用TA公司2000EX流变仪,对该体系黏度、储能模量进行评价,发现该体系成胶黏度在17000mPa·s以上,储能模量在10Pa以上,属强凝胶体系。将该体系成胶后的样品在45℃下放置180d,黏度损失率在10%以内,长期热稳定性良好。5次岩心剪切后,该体系黏度和储能模量均没有太大变化,对岩心进行水驱,其突破压力达9.2MPa,后续水驱10PV后压力仍能稳定在7.5MPa,残余阻力系数可达500,具有较好的耐剪切和耐冲刷性能。与常规酚醛浅调剖剂体系相比,DY-Ⅱ浅调剖剂体系综合成本可降低30%。DY-Ⅱ浅调剖剂在大庆杏北油田现场应用68口井,平均单井启动压力升高1.70MPa,平均单井视吸水指数下降10.37m3/(d·MPa)。
Daqing Oilfield has entered the development stage of ultra-high water-cut, with obvious contradiction between layers and planes. Shallow profile can be used as an important supplement to stratified waterflooding technology. However, the currently used profile control system has high cost, high toxicity and difficult field regulation Problem, for which, developed DY-Ⅱ shallow profile control agent. The concentration of the profile control agent polymer is 2000-3000 mg / L, and the cross-pollination ratio is 30: 1-40: 1. The viscosity and storage modulus of the system were evaluated by TA 2000EX rheometer. The results showed that the system has a gel viscosity of more than 17000mPa · s and a storage modulus of 10Pa or more, which is a strong gel system. The gelled sample of the system was placed at 45 ℃ for 180d, the viscosity loss rate was within 10%, and the long-term thermal stability was good. After 5 times of core shearing, the viscosity and storage modulus of the system did not change much. The water breakthrough of the core was 9.2MPa and the pressure of 10PV could be stabilized at 7.5MPa. The residual resistance coefficient Up to 500, with good shear resistance and erosion resistance. Compared with the conventional phenolic profile control system, DY-Ⅱ profile control system can reduce the overall cost by 30%. The application of DY-Ⅱ shallow profiler in the field of Xingbei oil field in Daqing has applied 68 wells, the average single-well start-up pressure increases by 1.70MPa and the average single well apparent water absorption index decreases by 10.37m3 / (d · MPa).