黏弹性表面活性剂自转向酸增黏转向的判别标准  

Viscosifying Steering Determination Criterion of Viscoelastic Surfactant Self-Steering Acid

作　　者：刘雪峰[1] 吴向阳[1] 朱杰[1] 易爱文[1] 陈栋[1] 

机构地区：[1]陕西延长油田股份有限公司,陕西延安717400

出　　处：《特种油气藏》2018年第1期150-154,共5页Special Oil & Gas Reservoirs

基　　金：国家科技重大专项"大型油气田及煤层气开发"子课题"鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程--低渗透致密砂岩气藏压裂裂缝及参数优化"(2016ZX05050-009)

摘　　要：黏弹性表面活性剂自转向酸酸液体系是油田酸化领域的研究热点,但在如何评价其是否达到转向效果及转向效果判别标准方面鲜有报道。将酸液在储层中的流动视为达西渗流,采用物理模拟实验和理论推导相结合的方法研究自转向酸增黏转向的原理,推导增黏转向的判别标准,并采用岩心并联实验验证判别标准的准确性。研究表明:必须同时满足pH值和阳离子浓度的要求,体系才能增黏;沿自转向酸液流动剖面上可将其分为高渗透区域、阻力区域、酸液滤液区域和原始地层区域,阻力区是实现自转向的关键;引入阻力孔隙体积倍数和无因次最大压力比推导了自转向酸均匀推进的判别依据;影响自转向酸实现理想转向的关键参数有无因次最大压力比、储层渗透率和孔隙度等参数。自转向酸驱替后,并联岩心的渗透率均显著提高,根据推导的判别标准,判断该酸化处理并没有达到最佳转向效果。该项研究为深入掌握黏弹性表面活性剂自转向酸的作用机理提供了技术指导。Viscoelastic surtactant self-steering acid system is a research hntspot in acidification field, reporled researches on whether to achieve steering and steering determination criteria. fnllows Darcy flow, the laboralory physical simulation and theoretical deduction are used It, study the viseosif!cing steering principle of self-steering acid and gain the determination criteria of In addition, the laboratory experiment with parallel core samples are conducted to verify this indicates that viseositing can be achieved by meeting both the requirements of pH value and cation concenlralion. It can be divided into high-permeability zone, resistan（e zone, acid filtrate zone and original self-steering acid. Resistance zone is the key to achieve self-sleering. The ratio between pore volume index in Ihe resistance znne and the maximum dimensionless pressure is introduced 1o deduce the detcrminalion serif-steering acid propulsion. The key tactors of achieving reasnnable self-sleering acid steering include the dimensionless maximum pressure ratin, reservoir permeahiIity, porosity anti other paranahrs. The pemleability of parallel core sawples is significantly increased by self-steering aeld flooding. The optimal steer- ing perfnnaance by at idification treatmenl is unrealized acenniing In the deduced deternination crilerion. This research could provide certain technical guidance for the further understanding of viscoelastic surfatant self-stecring action mechanism.

关 键 词：黏弹性表面活性剂 自转向酸 黏度 转向 判别标准 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]