高强度堵剂优化及其在高含水油藏靶向调堵中的应用

Optimization of high-strength plugging agent and its application in deep-targeted plugging of high water-bearing reservoirs

针对河南油田高渗高凝特高含水砂岩油藏,对双激发无机堵剂的配方优化、耐温耐盐性能、封堵性能、耐冲刷性能、粒径匹配等多方面进行系统研究。结果表明,缓凝剂和离子平衡剂是控制体系凝固时间的主导因素,随着主剂与激发剂浓度以及温度的增加,双激发无机堵剂固结速度增大。配液水中矿化度较高时,硫酸根和氯盐会加快体系固结时间。双激发无机堵剂封堵能力强,耐冲刷能力和深部液流转向效果较好,可对高渗透层大孔道有效封堵,提高低渗岩芯分流率,其封堵率高于98.5%。现场应用效果证实,双激发无机堵剂能够实现深部靶向封堵,具有强度高、有效期长、成本低等优点,调堵后含水率大幅下降。

The formulation optimization,temperature,salt resistance,plugging performance,flushing resistance and particle size matching of the dual-stimulated inorganic plugging agent were systematically studied for the high permeability,high condensation and extra high water-bearing sandstone reservoir in Henan oilfield.The results show that the retarder and ion-balancer are the dominant factors controlling the solidification time of the system,and the solidification rate of the dual-stimulated inorganic plugging agent increases with the increase of the concentration of the main agent and the stimulant as well as the temperature.When the mineralization of the liquid is higher,sulfate and chloride will accelerate the solidification time of the system.The double-stimulated inorganic plugging agent has strong plugging ability,good scouring resistance and deep fluid flow steering effect,which can effectively plug large pores in high permeability layer and improve the diversion rate of low permeability cores,and its plugging rate is higher than 98.5%.The field application effect confirms that the double-excited inorganic plugging agent can achieve deep targeting plugging.The advantages are high strength,long validity,and low cost,and the water content drops significantly after plugging.