中国石油勘探 ›› 2019, Vol. 24 ›› Issue (3): 391-396.DOI: 10.3969/j.issn.1672-7703.2019.03.012

• 工程技术 • 上一篇    下一篇

哈萨克斯坦阿克纠宾长位移水平井段提速实践

张小宁1, 石李保1, 包成虎2, 孙东柱3, 高军飞3, 李岩起3   

  1. 1 中国石油勘探开发研究院;
    2 中油国际(阿克纠宾)公司;
    3 中国石油集团大庆钻探工程公司国际事业部
  • 收稿日期:2018-03-21 修回日期:2019-01-20 出版日期:2019-05-15 发布日期:2019-05-14
  • 基金资助:
    国家科技重大专项“丝绸之路经济带大型碳酸盐岩油气藏开发关键技术”(2017ZX05030)。

Practice in improving ROP of extended-reach horizontal wells in Aktobe area, Kazakhstan

Zhang Xiaoning1, Shi Libao1, Bao Chenghu2, Sun Dongzhu3, Gao Junfei3, Li Yanqi3   

  1. 1 PetroChina Research Institute of Petroleum Exploration & Development;
    2 CNPC International Company(Aktobe);
    3 International Business Department, CNPC Daqing Drilling & Exploration Engineering Corporation
  • Received:2018-03-21 Revised:2019-01-20 Online:2019-05-15 Published:2019-05-14
  • Supported by:
     

摘要: 阿克纠宾项目所属北特鲁瓦和让纳诺尔两油田位于滨里海盆地东缘,目前主要采用水平井开发低孔低渗透储层,为提高单井产量,水平段从400m左右延伸至1000m以上,由于地质构造复杂、目的层边界和厚度变化大,采用带探边功能的旋转导向工具,平均钻速仅2.36m/h,平均进尺仅335m。为了提高钻井效率,针对已钻井出井钻头的破损特征,结合井下振动特性分析,优化了钻具组合和转盘转速,形成了以高性能PDC钻头、带螺杆旋转导向、近钻头单扶正器或双扶正器钻具组合为主体技术的提速技术。现场应用5口井,4口井转盘转速为60r/min,井下黏滑指数控制在80%以内,出井钻头以磨损为主,仅出现少数崩齿;1口井转盘转速为70~80r/min,井下黏滑指数在80%以上,芯部崩齿较多;与H814井钻井指标相比,水平段钻进周期从原来的22.5天缩短至9.6天,缩短57.7%,平均机械钻速提高266.1%,平均进尺提高195.5%。

 

关键词: 阿克纠宾, 高研磨地层, 钻具组合优化, 转盘转速优化, 黏滑指数, 机械钻速

Abstract: North Tluwa and Zanazor oilfields under the Aktobe project are located at the eastern margin of the Pre-Caspian Basin. The low-porosity and low-permeability reservoirs in the oilfields are exploited by horizontal wells. To increase the single-well production, the horizontal section is extended from about 400 m to more than 1000 m. However, complicated geological structures and large variations of the boundary and thickness of target layers result in low ROP and footage, only 2.36 m/h and 335 m on average, when a rotary steering tool with an edge detector is used during drilling. In order to improve the drilling efficiency, the BHA (bottom hole assembly) and the rotary speed were optimized depending on the damages of drill bits and the downhole vibration behaviors, and a ROP enhancement technology was developed with a BHA consisting of high-performance PDC bit, rotary steering screw, and near-bit single centralizer or double-centralizer. This technology has been applied in five wells. For four wells, the rotary speed was 60 r/min, the downhole stick-slip index was less 80%, and the drill bits were worn or partially broken. For the rest one well, the rotary speed was 70-80 r/min, the downhole stick-slip index was above 80%, and teeth breaking was mostly observed in bit core. Compared with Well H814, the drilling cycle in the horizontal sections was reduced by 57.7% from 22.5 days to 9.6 days, the average ROP was enhanced by 266.1%, and the average footage was increased by 195.5%.

Key words: Aktobe, abrasive formation, BHA optimization, rotary speed optimization, stick-slip index, ROP

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