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随着近年来勘探开发的深入,大斜度定向井、水平井、特殊工艺井的增加,当大斜度穿越长段页岩时,频繁遭遇了井壁失稳难题,严重影响了安全钻井,并给钻机工艺造成重大损失。常规水基钻井液和油基钻井液均不能有效解决页岩气探井及开发井钻井过程中的井眼坍塌难题。结合国内外强抑制水基钻井液现状,研发出一套具有优良封堵性的专用钻井液,并在现场应用,取得成功。
With the deepening of exploration and development, the increase of directional wells, horizontal wells, and special technology wells in recent years, the instability of the wellbore wall has been encountered frequently when the large gradient crosses the long-section shale, which has seriously affected the safety of drilling, And caused a significant loss to the rig technology. Conventional water-based drilling fluids and oil-based drilling fluids can not effectively solve the wellbore collapse problem of shale gas exploration wells and development wells during drilling. Combined with the strong inhibition of water-based drilling fluids both at home and abroad, a set of special drilling fluids with excellent plugging properties was developed and applied successfully in the field.