东胜气田锦30井区高性能水基钻井液技术研究

Technology research on high performance water-based drilling fluid for Jin 30 Well Area in Dongsheng Gas Field

摘要:

针对东胜气田锦30井区刘家沟组、石千峰组和石盒子组硬脆性泥岩地层漏塌复杂难题，通过室内岩石分析及理化性能测试分析，表明该区域泥岩地层具有高黏土矿物含量和多尺度裂缝发育的特征，在钻井过程中易发生黏土水化膨胀和裂缝扩展，导致井壁失稳。提出了一种以抑制黏土水化膨胀和强化多尺度裂缝封堵为核心的井壁稳定技术。通过室内研究和现场应用验证，研发的多盐配比高性能复合盐水基钻井液实现了对长裸眼段硬脆性泥岩的有效控制，提高了井壁稳定性。2024年有导眼水平井平均钻井周期较2023年缩短37.4%，为东胜气田锦30井区泥岩地层高效钻井提供了技术支撑。研究结果为类似地质条件下的油气勘探开发了提供了理论依据和实践参考。

Abstract:

Aiming at the complex problem of mudstone formation leakage and collapse in Liujiagou， Shiqianfeng and Shihezi Formations in Jin 30 Well Area of Dongsheng Gas Field， indoor rock analysis and physical and chemical performance tests are conducted， revealing that the mudstone formations have the characteristics of high clay mineral content， multi-scale fracture development， and are prone to clay hydration expansion and fracture expansion during drilling. A wellbore stabilization technology with the core of inhibiting clay hydration swelling and strengthening multi-scale fracture plugging is proposed. Through the verification of indoor research and field application， effective control of hard and brittle mudstone in the long open hole sections is realized by the developed multi-salt ratio high-performance compound salt drilling fluid， and the wellbore stability is significantly improved. Compared to the year 2023， the drilling period of horizontal wells with pilot hole in the year 2024 was shortened by 37.4%， which provides technical support for efficient drilling in mudstone formation in Jin 30 Well Area of Dongsheng Gas Field. The research results also provide theoretical basis and practical reference for oil and gas exploration and development under similar geological conditions.