海南福山凹陷保护油气层钻井技术

RESERVOIR PROTECTION TECHNOLOGY IN FUSHAN SAG OF HAINAN

通过室内试验分析了压差及浸泡时间对保护油气层的影响 ,并对相应的暂堵效果进行了分析。试验结果表明 ,渗透率随浸泡时间及压差的增加均有下降趋势 ;如果钻井液选择合理 ,其固相颗粒与孔喉匹配可以达到较好的暂堵效果 ;暂堵技术实施中应针对储层渗透率贡献大的孔喉进行封堵 ,而非孔喉中值。采取了较合理的保护油气层措施后 。

Laboratory tests were conducted to investigate how pressure differential and soaking time influence oil and gas protection results, and the corresponding temporary plugging results were also evaluated. Testing results showed that the permeability decreases with the increase of soaking time and pressure differential, and if suitable drilling fluid is selected, better temporary plugging result can be achieved because of the good compatibility of solid grains with formation throats. When applying the temporary plugging, it should be focused on the dominating throats that are important to formation permeability, not simply considering the average size of the throat. After adopting the suitable reservoir protecting measures, good results were obtained in Well Hua X4.