预交联凝胶颗粒对固-液共存体系性能影响研究

预交联凝胶颗粒(PPG)只能溶胀,而不溶于水的特性是固液共存体系发挥调剖作用的主要机理。PPG与聚合物、表面活性剂溶液组成的二元、三元固液共存体系的稳定性能,制约着该技术在油田开发中的实际应用效果。研究了制备的PPG的膨胀性能。研究表明该PPG产品溶于水1 d后即快速膨胀,3 d后基本稳定,膨胀快速且未完全溶解于水中。PPG水溶液在渗透率级差为8的双管填砂模型上的调剖试验表明,PPG注入后,高渗模型的分流量由近93%迅速下降至8%,低渗模型的分流量由近7%迅速上升至92%,调剖效果显著。在此基础上,研究了PPG与聚合物、表面活性剂溶液组成的二元、三元固液共存体系的稳定性能。研究结果表明,相对于单一聚合物体系,PPG的加入增加了体系的黏度以及老化期间的保黏率;该实验结果在PPG与聚合物二元固液共存体系的流变性试验中得到验证,PPG中可溶部分的溶解以及PPG与聚合物、表面活性剂的相互作用是造成上述结果的主要原因。

Study on the Solid-liquid Coexistence System Performance Influenced by Preformed Particle Gel

Preformed particle gel (PPG) can only be swelling and insoluble isStheSdominantSmechanismSofSsolid-liquid coexistence systemSinSprofile adjustment. The stable performance of binary or ternary solid-liquid coexistence system composed of PPG, polymer and surfactant solution restrict the practical application of the corresponding technologySin the oilfield.SProperty of cubic expansion of PPG was researched in this paper. The results show that PPG expand rapidly after they dissolved in the simulation water for 1 daySand were basically stable after 3 days. The expansion of PPG is rapid and insoluble. Profile adjustment test for PPG aqueous solution was studied in two-sand pack model of which the permeability contrast is 8. The results shows that water diversion rate of high permeability model falls from nearly 93% to 8% and the water diversion rate of low permeability model rises rapidly from nearly 7% to 92% when PPG aqueous solution was injected. Profile adjustment results meet the expected requirements. On this basis, the stable performance of binary or ternary solid-liquid coexistence system was studied. The results show that compared with the single polymer system, PPG increases the viscosity of the compound system and improves the viscosity retention rate during aging. The experimental results were verified in the rheological test of PPG and polymer solid-liquid coexistence system. The dissolution of the soluble part of PPG and the interaction between PPG and polymer/surfactant is the main cause of the above results.