裂缝性灰岩油藏堵水酸化机理

Mechanism of water plugging and acidizing on fractured limestone reservoir

张丽勤

Zhang Liqin

大庆油田有限责任公司第五采油厂，黑龙江 大庆 163513

No.5 Oil Production Plant, Daqing Oilfield Company Limited, PetroChina, Daqing 163513, China

为了研究裂缝性灰岩油藏堵水酸化的机理，模拟了地层条件，并进行了室内实验。研究结果表明，该技术除了常规堵水和酸化的机理外，还有其独特的机理。堵剂在裂缝及大的孔道中形成凝胶或冻胶，凝胶或冻胶因聚合物交联而形成的网状结构具有水锁效应；堵剂的转向作用提高了酸化的效率和效果；堵剂对酸化的缓速作用增大了酸化处理范围；堵水和酸化协同作用能够提高裂缝性灰岩油藏的最终采收率和产能。

  To study the mechanism of water plugging and acidizing on fractured limestone reservoir, the reservoir conditions are simulated. Besides the conventional water plugging and acidizing mechanisms, the unique mechanism of this technique that the plugging agent is become into the gel or jel in the fracture and large pore path and the net structure of gel or jel, created by polymer crosslinking, is of the water locking effect has been obtained through the laboratory experiment. The diversion effect of plugging agent improves the acidizing efficiency and effect. The retarded acting of plugging agent to acidizing enlarges the acidizing range. The synergetic effect of water plugging and acidizing can improve the ultimate recovery factor and deliverability in fractured limestone reservoir.