特低渗油藏长停井恢复技术

Restoration Technology of Long Term Shut-down Wells in Extra-low Permeability Reservoirs

针对延长油田特低渗油藏低产、低效长期停产井的特点,根据长停井形成的不同原因,应用水力喷射径向钻孔、补孔、选择性堵水、复合堵水、DRIVE解堵、二氧化氯解堵等治理技术对长停井进行治理。在现场应用中结合完善井网、注水井分注、注水井调驱技术,改善区块整体开发水平。在现场应用后,取得了较好的措施效果,并形成了长停井挖潜配套恢复技术,提高了特低渗油田注水开发水平。

In view of the characteristics of low-yield or inefficient long term shut-down wells in extra-low permeability reservoir of Yanchang oilfield, according to the causes forming long term shut-down wells, hydraulic radial perforation, perforation adding, selective plugging, compound plugging, DRIVE plug removal and ClO_2 plug removal were applied to treat these wells. In field application, the development level of the block was obviously improved in combination of well pattern improving, separate water injection, and flooding. After the field application, good results were achieved. A technology to recover long term shut-down wells was formatted to improve the water injection development level of extra-low permeability oilfields.