重晶石解堵技术在克深气田的先导性试验

库车前陆盆地克深气田储层裂缝发育,目的层钻进中,漏失钻井液携带重晶石颗粒进入天然裂缝,用堵塞渗透通道,用酸液难以有效清除重晶石堵塞,为此进行了重晶石解堵技术研究。分析了低孔裂缝性储层伤害原因及重晶石解堵剂解堵机理,并对重晶石解堵剂性能进行了室内实验,实验结果表明,该解堵剂溶解重晶石能力强、低腐蚀、易返排。该技术在克深气田进行了3井次先导性试验,改造后折日产量提高了1.5~5倍,增产效果显著。该研究为超深裂缝性储层增产技术提供了一种新思路。

Application of Barite Deplugging Technology to The Pilot Tests of Keshen Gasfield

Fractures are pretty developed in the reservoirs of the Keshen Gasfield, Kuqa foreland basin. During the drilling in the target formations, the leaked drilling fluid carries barite particles into the natural fractures, blocking up the percolation channels. Barite clogging is difficult to be effectively eliminated with acid fluids. To this end, the authors studied a technology of barite blockage removal. They analyzed the causes of formation damage in fractured reservoirs with low porosity and blockage removal mechanism of the barite blockage removal agent. The performance of the barite blockage remover was studied through indoor experiments. The results showed that the barite blockage remover had a good ability to dissolve the barite, with low corrosivity and being easy to be flowed back. This technique was applied to the Keshen Gasfield for pilot tests of three well-times.The equivalent daily production rate was increased by 1.5 to 5 times after the stimulation, showing the remarkable effects of increasing production. The research provides a new way of thinking for reservoir stimulation technique in the ultra-deep fractured reservoirs.