压裂液滤失性对增油效果的影响和作用机理

发布时间：2018-07-03 19:25

本文选题：胍胶 + 聚合物　；参考：《油田化学》2017年02期

【摘要】：非均质油藏水驱或聚合物驱后,油井附近区域中低渗透储层难以波及,剩余油饱和度较高。为深入了解压裂液滤失性对压裂增油效果的影响,比较了5种压裂液的滤失性能,通过改变压裂液滤失时间和裂缝长度,研究了压裂液滤失性对增油效果的影响和作用机理。结果表明,与改性胍胶相比,合成聚合物压裂液滤性能良好,滤失液可以将水平裂缝入口附近区域岩心中剩余油驱替到岩心深部区域,在后续水驱作用下剩余油再沿裂缝返回采出端,达到提高采收率的目的。通过选择压裂液类型以及增加压裂施工时间和裂缝长度,可使压裂液滤失量增加,滤失液波及体积增大,发生运移剩余油量增加,导致采收率增幅提高。从技术经济效益角度考虑,推荐"聚合物溶液+聚合物凝胶"段塞组合进行施工,合理的压裂裂缝长度为1/5数1/3注采井距。
[Abstract]:After water flooding or polymer flooding in heterogeneous reservoirs, low permeability reservoirs near oil wells are difficult to sweep and the remaining oil saturation is high. In order to understand the effect of fracturing fluid filtration on fracturing oil increasing effect, the filtration performance of five fracturing fluids was compared. By changing the filtration time and fracture length of fracturing fluid, the effect and mechanism of fracturing fluid filtration on oil increasing effect were studied. The results show that the synthetic polymer fracturing fluid has good filtration performance compared with the modified guanidine gel, and the fluid can drive the remaining oil in the core near the entrance of the horizontal fracture to the deep part of the core. The remaining oil is returned to the recovery end along the fracture under the action of subsequent water flooding, which achieves the purpose of improving oil recovery. By selecting the type of fracturing fluid and increasing fracturing operation time and fracture length, the filtration loss of fracturing fluid can be increased, the swept volume of fluid can be increased, the remaining oil quantity of migration will be increased, and the increase of oil recovery will be increased. From the point of view of technical and economic benefit, it is recommended that "polymer gel" slug combination should be operated, and the reasonable fracturing fracture length is 1 / 5 number 1 / 3 injection-production well distance.
【作者单位】：提高油气采收率教育部重点实验室(东北石油大学);中国石油大庆油田井下作业公司;
【基金】：国家自然科学基金面上项目“抗盐型聚合物油藏适应性及其改进方法基础研究”(项目编号51574086) 大庆油田重点科技攻关课题“聚合物压裂液驱替距离及驱油效率研究”(项目编号DQYT-0513003-2015-JS)
【分类号】：TE357.12

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