储层渗透率对复合热载体吞吐效果的影响

Effect of reservoir permeability on huff and puff performance of combined thermal carrier

赵明国 贾慧敏 杨洪羽 察兴辰

东北石油大学提高采收率教育部重点实验室，黑龙江 大庆 163318 中国石油长庆油田公司第六采油厂，陕西 定边 718600

MOE Key Laboratory of Enhanced Oil Recovery, Northeast Petroleum University, Daqing 163318, China No.6 Oil Production Plant, Changqing Oilfield Company, PetroChina, Dingbian 718600, China

针对萨北过渡带地层条件复杂，注水开发含水上升、产量递减速度较快，依靠单纯的提液和常规堵水调剖等技术挖潜难度大的情况，提出了采用复合热载体吞吐来提高采收率。文中结合萨北过渡带地层条件，进行了不同渗透率岩心复合热载体吞吐室内实验，分析了岩石渗透率对复合热载体吞吐效果的影响。结果表明，萨北过渡带采用复合热载体吞吐是可行的，但其效果与岩石渗透率有关。在相同吞吐条件下，岩石渗透率越高，复合热载体吞吐采收率、含水率越高，气油比越低。随着复合热载体吞吐周期增加，采收率、含水率、气油比增加，直到第3周期，采收率、含水率开始降低。对比不同周期吞吐效果，复合热载体吞吐应选择3个周期。

Aimed at the problems of complex formation condition, water cut rising, oil production decreasing and great technology difficulty of potential tapping by simple solution and conventional water shutoff profile control, this paper puts forward the EOR technology by combined thermal carrier. Combined with the formation condition of Sabei transitional zone, the in-house experiment of thermal carrier huff and puff is carried out with different cores permeability and the effect of permeability on combined thermal carrier is analyzed. The results show that it is feasible to adopt the combined thermal carrier huff and puff in Sabei transitional zone, while the effect is related to the permeability. Under the same conditions, the higher the rock permeability is, the higher the oil recovery of combined thermal carrier huff and puff and water cut are, the lower the oil-gas ratio is. With the increase of composite heat carrier stimulation cycle, oil recovery, water cut and gas-oil ratio increases. Until the third cycle, oil recovery and water cut begin to reduce. Comparing with the effect of different periodic stimulation, three cycles can be choosen for combined thermal carrier huff and puff.

10.6056/dkyqt201404026