Study and application of drilling technology for Permian igneous rocks in Shunbei Oil and Gas Field
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摘要: 塔里木盆地顺北区块二叠系火成岩地层厚度大、硬度高、裂缝发育、非均质性强，导致机械钻速低与堵漏耗时长，相比邻区平均钻井周期增加达1.5倍。近几年，通过持续强化钻井液堵漏技术与优选高效钻井工艺，漏失量与堵漏时间逐步缩短，钻井指标逐年提高。本文分析了影响堵漏时间长与机械钻速低的主控因素，提出堵漏浆中加入竹纤维、变形颗粒以改善堵漏工艺技术，明确了冲击工具的适用条件，优选攻击性与抗冲击性的PDC钻头，改进混合钻头结构以及配套大扭矩、长寿命螺杆等技术对策，提速降本成效显著，为加快顺北油气田的高效勘探开发提供了指导。Abstract: The Permian igneous rocks formation in Shunbei Block of Tarim Basin has the characteristics of large thickness， high hardness， developed fractures and strong heterogeneity， which leads to low ROP and long plugging time. the average drilling cycle increases by 1.5 times compared with the adjacent areas. In recent years， through continuous strengthening the drilling fluid plugging technology and the optimization of high-efficiency drilling technology， the leakage and plugging time have been gradually shortened， and the drilling index has been increased year by year. In this paper， the main controlling factors affecting the long plugging time and low penetration rate are analyzed， and the plugging technology is improved by adding bamboo fiber and deformed particles into the plugging slurry. The applicable conditions of the impact tool are clarified， and the PDC bit with aggressiveness and impact resistance is optimized. Technical countermeasures such as improving the structure of the mixed bit and supporting the high torque and long life screw have achieved remarkable results in increasing drilling speed and reducing cost， which provides guidance for accelerating the efficient exploration and development of Shunbei Oil and Gas Field.
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Key words:
- Permian igneous rock /
- plugging /
- PDC drill bit /
- high torque PDM /
- impact tool /
- Shunbei Oil and Gas Field
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