SXJD-Ⅰ型低伤害暂堵修井液技术

The Technology of SXJD-Ⅰ Type Low Damage Temporary Plugging Workover Fluid

为满足老油田修井需求、并兼顾储层保护,以KCl溶液为基液,通过优化屏蔽暂堵主剂、胶体保护剂及屏蔽暂堵辅剂加量,形成了SXJD-Ⅰ型低伤害暂堵修井液.室内评价表明:该修井液具有良好的滤失性和堵漏性能,暂堵颗粒可迅速被油井产出液中的油和水分解,缩短修井后的排水周期;岩心渗透率恢复率大于88.0%,较常规修井液渗透率恢复率大幅提高.SXJD-Ⅰ型低伤害暂堵修井液在胜利油田GU249井和哈萨克斯坦KKM油田301井、190井等3口井进行了现场应用,其封堵效果良好,能够满足修井作业需要,排水复产期缩短40.0%以上.研究表明,SXJD-Ⅰ型低伤害暂堵修井液的封堵和储层保护效果良好,具有推广应用价值.

In order to satisfy the requirements of both workover and reservoir protection in mature oilfields,the SXJD-Ⅰtype low damage temporary plugging workover fluid was developed by taking the KCl solution as the base fluid,and optimizing the shielding temporary plugging main agent,colloidal protective agent and temporary plugging assisting agent.The inside evaluation showed that the workover fluid had good filtration and plugging performance,the temporary plugging particles could be quickly dissolved by oil and water in the produced fluids,which significantly reduced the water drainage period after workover.With a core permeability recovery rate greater than 88.0%,it exhibited a significantly enhanced permeability recovery rate,which was better than the conventional workover fluids.SXJD-Ⅰtype low damage temporary plugging workover fluid has been tested in three wells:Well GU249 in Shengli Oilfield,Well 301 and Well 190 in KKM Oilfield,Kazakhstan,where they achieved a good sealing effect.The new fluid can meet the needs of workover operation,and the water drainage period can be shortened by 40.0%or more.The research indicated that SXJD-Ⅰtype low damage temporary plugging workover fluid had good sealing and reservoir protection effect,with sound popularization and application prospects.