广西百色油田那读组油基钻井液技术

针对广西百色油田那读组地层复杂，在该地层钻进极易发生井壁失稳导致恶性坍塌的井下复杂情况，特别是 在水平井钻井施工过程中，更易发生恶性坍塌甚至卡钻的问题，开展了针对性的那读组水平井强封堵油基钻井液体系 研究。该钻井液体系以纳米级固液复合等封堵材料增强封堵性能，同时体系具有较强的抗污染性能、良好的润滑性 能等特性。该体系在坤8-6HF 井三开进行了现场试验，应用效果表明该体系能有效地保持井眼稳定，优质的油基钻 井液性能满足了安全钻井施工的需要，很好地解决了百色地区那读组水平井钻井过程中的恶性坍塌等技术难题。

Oil-based Drilling Fluid Technology of Nadu Formation in Baise Oilfield

The Nadu formation of Baise Oilfield is fairly complex，in which malignant collapse caused by borehole instability happen easily during drilling. To solve this problem，the strong sealing and inhibitive oil-based drilling fluid is researched and developed. This system comprises of nanoscale solid-liquid sealing material so as to improve the sealing properties and has good anti-pollution，lubricating and rheological properties. The experiment applied in third section of well Kun 8 6HF shows that the oil-based drilling fluid can prevent the wellbore from collapsing and meet the requirement of safe drilling. Thus it has efficiently solved the complex problem of malignant collapse during horizontal well drilling in Nadu formation.