摘要
受碳酸盐岩断溶体内部复杂性的影响,塔里木油田缝洞型储层钻井一次中靶率低,复杂地层压力和地应力系统导致钻井复杂频发、完井提产措施难以优选和优化,制约了油气勘探开发进程。以地质力学研究为基础,建立了地质工程一体化思路,跨学科协作,结合断裂解剖和断溶体刻画,从井位部署源头、钻井工程过程跟踪和完井提产措施定量优化等环节,确保塔北隆起南缘跃满西区块的钻探成功率。研究中,充分考虑断溶体的分布和主应力方位分布、天然裂缝渗透性方向和井壁稳定性方向等因素,建立了井点优选和斜井井轨迹优化方法,并采用井震联合的方法预测了地层压力分布特征,据此优化井身结构;完钻措施阶段,以井筒周围应力场分布、井眼与储层分布方向等的匹配关系提出了4类完井提产措施方法。应用该研究结果,跃满西区块已完钻的W22、W20等3口井勘探持续突破并获高产,该研究思路为其他缝洞型碳酸盐岩储层勘探开发提供了借鉴依据。
Influenced by the complexity inside the faulted -vuggy carbonate bodies, the first target drill-in rate of the fractured-vuggy reservoir in the Tarim Basin is low, complex formation pressure and stress systems lead to difficult drilling operation and frequent incidents, and it is hard to optimize effective measures for well completion and increasing production capacity. These have delayed the oil and gas development process. Based on geomechanical research, the idea of geological-engineering integration is proposed which involves interdisciplinary cooperation, fine fault interpretation and faulted-vuggy body characterization, and drilling success rate can be increased by quantitative optimization from well location, drilling process to measures related to well completing and production capacity increasing in the West Yueman oilfield in the northern Tarim Basin. In the study, by focusing on the distribution of faulted-vugg bodies and principle stress azimuth, the orientation of natural fracture permeability and well stability, optimization methods have been established for well location and deviated trajectory, the distribution of formation pressure has been predicted using well-seismic data, and based on which the wellbore structure was optimized. In addition, four kinds of methods for well completion and increasing production capacity have been proposed based on near- wellbore stress distribution, wellbore orientation and reservoir distribution. Application of these methods in three wells including W22, W20, etc. provided high production, and made continuous exploration breakthrough in the West Yueman block, northern Tarim Basin. The study idea proposed in this paper provides references for exploration and development of other fractured-vuggy carbonate reservoirs.
作者
杨海军
张辉
尹国庆
韩兴杰
Yang Haijun;Zhang Hui;Yin Guoqing;Han Xingjie(Institute of Petroleum Exploration and Development, PetroChina Tarim Oilfield Compan)
出处
《中国石油勘探》
CAS
北大核心
2018年第2期27-36,共10页
China Petroleum Exploration
基金
国家科技重大专项"塔里木盆地奥陶系-前寒武系油气成藏条件与区带目标优选"(2016ZX05004-004)
关键词
地质工程一体化
缝洞型碳酸盐岩
地质力学
轨迹优化
提产措施
分类
geology-engineering integration, fractured-vuggy carbonate, geomechanics, well trajectory optimization, measures for increasing production capacity, classification
