油基泥浆对岩心损害的室内测试

LABORATORY TESTS FOR THE DAMAGE OF OIL-BASD MUD TO CORE

马永海

Ma Yonghai

中国海洋石油南海东部公司 广州510240

China Offshore Oil Nanhai East Corporation, Guangzhou

通过对南海某油田岩心进行的油基泥浆污染的室内模拟试验,证实油基泥浆不但改变岩心的润湿性,使其变成强亲油,而且还造成油基泥浆中的固体颗粒对岩石孔隙的堵塞,结果使油相有效渗透率和绝对渗透率大幅度下降。岩心被油基泥浆损害后,凭常规的注水冲刷手段,渗透率很难恢复到原来的水平。

Simulation tests for oil-based mud contamination of the cores sampled from an oilfield of South China are carried out in laboratory, which proved that oil-based mud not only changed the wettability of cores into a strong lipophilicity, but also caused the rock pores being blocked by the solid grains in oil-based mud, as a result,there is a great reduction in effective and absolute permeabilities of oil phase. Once cores are damaged by oil-based mud, it is difficult to restore the permeability of cores to its original level by applying the conventional technique of water injecting and washing.

https://doi.org/10.11781/sysydz199602216