摘要
鄂尔多斯盆地陇东地区长7致密油储层主要为重力流砂体沉积,砂体的分布在垂向和横向上均复杂多变,单砂体厚度薄,对高效钻井和生产提出了挑战。文章提出了一套利用近钻头随钻测量技术等多学科知识相结合的地质工程一体化方法。在综合地质研究的基础上,建立三维精细地质、油藏和地质力学模型,进行钻井位置优选、工厂化平台设计、钻井作业实施和地质导向方案优化,使井轨迹设计科学合理,钻井过程中提高砂体钻遇率,同时保证后期生产阶段较高的单井产量与井区的最终长期累计产量。研究结果表明:研究区的优质储层主要为碎屑流的块状砂岩,提高钻遇率的核心在于利用实时传输随钻测量数据,综合分析钻、测、录数据,确定钻头在沉积旋回的位置,从而确定地质导向作业方案。在该方法指导下实施的两口水平井钻井作业,油层钻遇率较周边井钻遇率提高5%~10%;通过早期基于地质模型和地质力学模型基础上的数值模拟,结合钻井和生产实践科学布井,最终选定400m为研究区最佳水平井井距。
The tight oil reservoirs of Chang 7 member in Longdong area,Ordos Basin,is mainly gravity fl ow sand bodies.The distribution of sand bodies is complex in both vertical and lateral directions,and the thickness of single sand body is thin,which poses a challenge to effi cient drilling and production.In this paper,a set of geology-engineering integration methods are proposed,which combines multi-disciplinary knowledge such as near-bit measurement while drilling(MWD)technologies.On the basis of comprehensive geological researches,3D fi ne geology,reservoir and geo-mechanics models are established for selection of well locations,design of factory-like platforms,drilling operations and optimization of geo-steering schemes,so as to design well trajectory scientifi cally and reasonably,enhance the penetration rate of sand body during drilling,and ensure higher single well production in later production stage as well as the ultimate long-term accumulative production of the well block.The results show that the high-quality reservoirs in the study area are mainly massive clastic-fl ow sandstones.And the key to improve penetration rate is to use the real-time transmission MWD data,and comprehensively analyze the drilling,well logging and mud logging data to determine the accurate bit location in the sedimentary cycle,so as to determine the geo-steering operation scheme.Under the guidance of this method,2 horizontal wells were drilled,whose penetration rates of oil layers were 5-10%higher than that of the surrounding wells.According to the early-stage numerical simulation based on geology and geo-mechanics models,combined with scientifi c well spacing during drilling and production practice,the optimized horizontal well spacing in the study area was fi nally defi ned as 400m.
作者
冯张斌
马福建
陈波
李德胜
常波涛
冷先刚
柴慧强
吴凯
杨永兴
王永康
黄勇杰
丁黎
李治君
卢庆治
潘元炜
胡中
付在荣
王维
Feng Zhangbin;Ma Fujian;Chen Bo;Li Desheng;Chang Botao;Leng Xiangang;Chai Huiqiang;Wu Kai;Yang Yongxing;Wang Yongkang;Huang Yongjie;Ding Li;Li Zhijun;Lu Qingzhi;Pan Yuanwei;Hu Zhong;Fu Zairong;Wang Wei(Tight Oil Project Team of Changqing Oilfi eld Company,PetroChina;Schlumberger(China))
出处
《中国石油勘探》
CAS
CSCD
北大核心
2020年第2期155-168,共14页
China Petroleum Exploration
基金
国家科技重大专项“鄂尔多斯盆地致密油开发示范工程”(2017ZX05069)。
