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HF203井是部署在四川盆地川东北通南巴构造带河坝场西高点南翼上的一口开发定向井。设计斜深6 013 m,最大井斜角61.54°。针对HF203井四开4 524.15~4 890.45 m井段在40余天内连续发生5次卡钻及本井存在的复杂情况,专家团就此展开分析讨论,并提出解决复杂井况的技术思路。现场应用证明,通过改善钻井液的抗高温、抗污染润滑性、流变性,增大洗井排量,对漏层与高渗透性地层进行8 h全封闭、全覆盖承压堵漏,能有效的解决该井的复杂情况,确保了本井能顺利完钻。
The HF203 well is a developed directional well deployed on the south wing of the west high point of the dam site in the NW-Tung-Tong structural belt of Sichuan Basin. Design oblique depth of 6 013 m, the maximum inclination angle of 61.54 °. In view of the complex situation of 5 times of stuck-pipe drilling and well existence in 4 wells from 4 524.15 to 4 890.45 m in well of HF203 well in more than 40 days, the expert group started the analysis and discussion and proposed the technical mentality of solving complex well conditions. The field application proves that by improving the anti-high temperature of the drilling fluid, anti-pollution and lubricity and rheology, and increasing the well discharge volume, the leaky layer and the high permeability formation are fully closed for 8 hours and the full-coverage pressure plugging is effective Solving the complex situation of the well ensures that the well can be successfully drilled.