论文部分内容阅读
本文考察了在裂缝性岩石中存在一种交替凝胶机理的可行性:pH触发式聚合物微凝胶技术。微凝胶颗粒很小,能通过裂缝而不能通过孔隙吼道。pH值自然不可避免地发生改变,所以为深部布置提供了一个简单途径。聚合物溶液通过露头岩心中的人工裂缝注入地层。注入后关井一段时间进一步反应来增加pH值,从而影响渗透率减少因子和原始裂缝岩心渗透率与已处理岩心渗透率的比值。渗透率减少因子在各种试验中测量的范围为200～5。凝胶的速度碳酸盐岩比砂岩中更快,渗透率减少因子也更高。由于岩心的中和能力比较强,在储层中通过不断地循环聚合物流出液来使反应进行是可能的。实验表明在贝雷砂岩中30PV聚合物循环后呈现凝胶特征。
This article examines the feasibility of an alternate gel mechanism in fractured rocks: pH-triggered polymer microgel technology. Microgel particles are small and can not pass through the pores and roar. The pH naturally inevitably changes, thus providing a simple way for deep placement. The polymer solution is injected into the formation through artificial fractures in outcore cores. After injection, the well is shut in for a period of time to further react to increase the pH, thereby affecting the permeability reduction factor and the ratio of the original fracture core permeability to the treated core permeability. The permeability reduction factor measured in various tests ranged from 200 to 5. The rate of gelation of carbonate rock is faster than sandstone, and the permeability reduction factor is also higher. Due to the relatively high neutralization capacity of the core, it is possible to carry out the reaction in the reservoir by continuously circulating the polymer effluent. Experiments show that the 30PV polymer exhibits gel characteristics after cycling in Berea sandstone.