快速钻井液技术在海拉尔盆地的应用研究

The research and application of the fast drilling fluid technology in Hailaer Basin.

海拉尔区域井中上部地层造浆严重,易形成泥环,导致严重阻卡,中下部地层可钻性差,研磨性强,导致钻井机械钻速低、钻井周期长,下部地层易发生井壁垮塌、严重掉块等现象,严重影响海拉尔区域勘探开发进程。为此,采用快速钻井液技术在海拉尔盆地乌126-88井进行了现场提高机械钻速试验。结果表明,快速钻井剂与现场所用的两性复合离子钻井液体系具有良好的配伍性,对钻井液常规性能及流变性没有影响,且有效解决了井壁失稳以及起下钻过程中的阻卡问题,试验井段井径规则,平均机械钻速提高23.31%以上,有效缩短了钻井周期。

In Hailaer area there exists serious mud-making in the borehole upper formation and mud ring is easily formed to give rise to serious sticking.The poor drillability and strong abrasiveness in the middle and lower formations lead to the low penetration rate as well as long drilling cycles.It is easy for the well wall to collapse and blocks to fall seriously in the lower formation.All these seriously affect the progress of exploration and development in Hailaer.Therefore,the fast drilling fluid technology was adopted to conduct the field test to improve the penetration rate in Well 126-88 of Hailaer Basin.The result showed that the fast drilling agent had a desirable compatibility with the amphoteric compound ion drilling fluid system applied on the spot.The agent had no effect on the normal performance and rheological property of the drilling fluid,thus effectively solving the problems of the instability of the well wall and the sticking in the process of tripping.The borehole of the test section was regular,the average penetration rate was improved by over 23.31% and the drilling cycle was shortened effectively.