渤海埕北油田、绥中36—1油田注水井堵塞机理研究

THE PLUGGING MECHANISM OF WATER INJECTION WELLS IN CHENGBEI AND SUIZHONG 36-1 OILFIELD OF BOHAI

介绍了埕北油田和绥中36—1油田的油藏物性和完井方式，通过测定岩心阳离子交换容量、体积流过量试验、动态结垢试验与理论预测、温度变化对水相渗透率的影响试验和敏感性试验结果及现场注水资料对两油田注水井水敏性堵塞、酸敏性堵塞、固体颗粒侵入堵塞、微粒运移堵塞、地层结垢堵塞、污油堵塞和地层出砂堵塞的机理进行了研究，得出造成埕北油田注水井堵塞的主要原因是水敏性堵塞、污油堵塞、固体颗粒侵入堵塞和地层出砂堵塞；绥中36－1油田造成注水井堵塞的主要原因是污油堵塞、固体颗粒侵入堵塞、地层出砂堵塞和地层结垢堵塞。为解堵方法的选择、解堵剂的研制、防垢剂的选择和解堵施工打下了基础，对两油田的注水工作具有指导意义。

This paper introduced the physical properties of reservoir and the completion method of Chengbei and Suizhong 36-1 oilfield. The mechanism of water-sensitive plugging, acid-sensitive plugging, solid particle intrusive plugging, fine particle migration plugging, formation scale deposit plugging, sump oil plugging and formation sand production plugging in water injection wells of two oilfields was studied by cation exchange capacity determination of core, volume flow test, dynamic deposit test and theoretical prediction, the test of the effect of temperature variation on the permeability of water phase, the sensitivity test and on-site water-injection data. The main reasons resulted in plugging in water injection wells of Chengbei oilfield were water-sensitive plugging, sump oil plugging, solid particle intrusive plugging and formation sand production plugging; the reasons for Suizhong 36-1 oilfield were sump oil plugging, solid particle intrusive plugging, formation sand production plugging and scale deposit plugging. This paper provided the basis for choosing plug removal method, developing plug removal agent, choosing scale inhibitor and carrying out plug removal. It had a directive significance for water flooding in two oilfields.