摘要
随着开采年限的增加,辽河油田油井采收率逐年下降。目前常规的压裂液仅以补充地层能量为目的,没有考虑油层内油水流动阻力的问题。体积压裂技术是针对地层亏空严重、低产低效油井改造而发展起来的一种新型压裂技术。减阻剂作为体积压裂液中最重要的一项添加剂,减阻性能对施工质量起到关键的影响作用。本研究选取了FP1、FP2等8种减阻剂,从改善油水两相流的流变性、原油乳状液的乳化性以及润湿性变化三个方面进行减阻性能评价,得到以下结论:FP1对油水两相流体的流变性改善效果最佳,加入油水两相液后达到完全乳化时的乳化转速低、速率快、稳定性高;随着FP1的浓度增大,亲水性石英片润湿性的转变为亲水—弱亲油—亲水,而亲油性石英片润湿性的转变为亲油—亲水。石英片接触角降至90°以下,黏附功得到显著降低。
Recovery of oil wells in Liaohe Oilfield decreases year by year with the increase of production pe-riod.Normal fracturing fluid is to supply the formation energy without consideration of oil-water flow resistance in reservoirs.Volume fracturing technology is a new type of one developed for the reconstruction of low produc-tion and low efficiency oil wells in depleted reservoirs.As one of the most important additives in volume frac-turing fluid,drag reduction agent plays a key role in affecting the quality on operation.In this study,eight kinds of drag reduction agents,such as FP1 and FP2,were selected to evaluate the drag reduction performance from three aspects of improving the rheological properties of oil-water two-phase flow and emulsification and wettability of crude oil emulsion.The following conclusions are drawn :FP1 has the best improvement effect on the rheological properties of oil-water two-phase fluid.When the oil-water two-phase liquid is added to achieve complete emulsification,the emulsification speed is low,the rate is fast and the stability is high.With the increase of FP1 concentration,the wettability of hydrophilic quartz flakes changes to be hydrophilic-weak lipophilic-hydrophilic,while the wettability of lipophilic quartz flakes changes to be lipophilic-hydrophilic.The contact angles of quartz flakes are all lower than 90 °,and the adhesion work is significantly reduced.
作者
田浩
Tian Hao(Research Institute of Drilling&Production Technology,PetroChina Liaohe Oilfield Company,Panjin Liaoning 124010)
出处
《中外能源》
CAS
2022年第7期37-41,共5页
Sino-Global Energy
基金
辽河油田重大科技专项“低成本高效压裂技术研究与应用”(编号:2018-JLFZ-03)。
关键词
压裂液
减阻性能
流变性
乳化性
润湿性
fracturing fluid
drag reduction performance
rheological properties
emulsification
wettability