中国石油勘探 ›› 2020, Vol. 25 ›› Issue (2): 155-168.DOI: 10.3969/j.issn.1672-7703.2020.02.015

• 工程技术 • 上一篇    

鄂尔多斯盆地长7 致密油地质工程一体化解决方案 ——针对科学布井和高效钻井

冯张斌1 ,马福建2 ,陈波1 ,李德胜1 ,常波涛2 ,冷先刚1 ,柴慧强1 ,吴凯2 , 杨永兴1 ,王永康1 ,黄勇杰2 ,丁黎1 ,李治君1 ,卢庆治2 ,潘元炜2 ,胡中2 , 付在荣2 ,王维2   

  1. 1 中国石油长庆油田公司致密油项目组;2 斯伦贝谢中国公司
  • 出版日期:2020-03-15 发布日期:2020-03-13
  • 基金资助:
    国家科技重大专项“鄂尔多斯盆地致密油开发示范工程”(2017ZX05069)。

A Geology-engineering integration solution for tight oil exploration of the Chang-7 member, Yanchang Formation in the Ordos Basin – focusing on scientific well spacing and efficient drilling

Feng Zhangbin1,Ma Fujian2, Chen Bo1,Li Desheng1, Chang Botao2,Leng Xiangang1,Chai Huiqiang1, Wu Kai2, Yang Yongxing1, Wang Yongkang1,Huang Yongjie2, Ding Li1, Li Zhijun1, Lu Qingzhi2, Pan Yuanwei2,Hu Zhong2, Fu Zairong2, Wang Wei2   

  1. 1 Tight Oil Project Team of Changqing Oilfield Company, PetroChina; 2 Schlumberger (China)
  • Online:2020-03-15 Published:2020-03-13
  • Supported by:
     

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。本文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积产量。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。

 

关键词: 鄂尔多斯盆地, 致密油, 地质工程一体化, 地质导向, 地质建模

Abstract: The tight oil reservoirs of the Chang-7 member in the Longdong area of the Ordos Basin are primarily gravity flow sand bodies. The distribution of sand bodies is complex in both vertical and lateral directions, and the thickness of single sand bodies is thin, which poses a challenge to efficient drilling and production. In this paper, a set of geology-engineering integration methods are proposed, which combine multi-disciplinary knowledge such as near-bit ‘Measurement While Drilling’ (MWD) technology. On the basis of comprehensive geological research, 3D fine 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. The aim is to design well trajectories scientifically and reasonably, enhance the penetration rate of sand bodies during drilling, and ensure higher single well production in later production stages as well as the ultimate long-term cumulative production of the well block. Results show that high-quality reservoirs in the study area are mainly massive clastic-flow sandstones. The key to improving penetration rates is to use real-time transmission MWD data, and comprehensively analyze drilling, well logging and mud logging data to determine accurate bit location in the sedimentary cycle in order to determine the geo-steering operation scheme. Guided by this method, two horizontal wells have been drilled, with penetration rates of oil layers 5?10% higher than those of the surrounding wells. According to early-stage numerical simulation based on geology and geo-mechanics models, combined with scientific well spacing during drilling and production practice, the optimum horizontal well spacing in the study area was finally determined to be 400 m.

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