一种新型油田高渗透层封堵技术——超细纤维封堵剂

A New Plugging Technique for High Permeability Layer on Oilfield——Superfine Fiber Blocking Agent

赵 觅 李 博 蔡永茂 李洪富

ZHAO Mi LI Bo CAI Yong-Mao LI Hong-Fu

为了探索油田开发过程中各种驱替方式下有效解决厚油层内部高渗透层或平面上高渗透条带对驱油效果的影响，考察了超细纤维封堵剂——CZZL-10对填砂管和人造岩心的封堵效果。水驱填砂管实验结果表明，CZZL-10驱替后填砂管的渗透率比水驱时降低了90%以上，驱替压力增大10.6倍；聚合物驱封堵实验结果表明，加CZZL-10驱后的渗透率比单独聚合物驱时降低了80%以上，驱替压力增大7.4倍。人造均质岩心实验结果表明，岩心渗透率高，CZZL-10的封堵效果明显。岩心水测渗透率分别为435×10-3、666×10-3、953×10-3 μm2时，CZZL-10对岩心的封堵率分别为40.0%、66.7%、57.6%，岩心残余阻力系数分别为1.6、3.0、2.1。封堵后岩心最低水测渗透率为222×10-3 μm2，达到了堵而不死的目的。用超细纤维聚合物溶液封堵3层非均质岩心，非均质变异系数越大、渗透率级差越大的岩心，高渗透层封堵效果越好，高渗透层分流率大幅下降，中、低渗透层分流率大幅上升，实现了扩大波及体积，提高采收率的目的。

In order to effectively solve the high permeable layer or plane channel influence on oil displacement effect under a variety of displacement methods during oilfield development process, the effect of microfiber blocking agent CZZL-10 on sand filling tube and artificial core plugging was investigated. Sand filling tube experiment result of water flooding showed that the permeability ratio of tube after CZZL-10 flooding reduced by more than 90% than that after water flooding, and driving pressure increased 10.6 times. Plugging experiment result of polymer flooding showed that after adding CZZL-10, the permeability ratio of polymer flooding reduced by more than 80%, and driving pressure increased 7.4 times. Experiment result of artificial homogeneous core showed that when core permeability was high, the effect of blocking using CZZL-10 was significant. When the water permeability of core was 435×10-3, 666×10-3 and 953×10-3 μm2, the core plugging rate of CZZL-10 was 40.0%, 66.7% and 57.6%, and the residual resistance factor of core was 1.6, 3.0 and 2.1, respectively. The lowest measured water permeability was 222×10-3 μm2 after plugging, achieving the purpose of blocking while not totally blocked. Microfiber polymer solution was used to plug three layer heterogeneity cores. The larger heterogeneity variation coefficient and permeability differential of the core, the better blocking effect of high permeability layer was. The shunt rate of high permeability layer decreased significantly, while that of low-mid level permeability layer increased substantially, which achieved the purpose of expanding swept volume and enhancing oil recovery .