于荣泽，王成浩，张晓伟，等. 北美Eagle Ford深层页岩气藏开发特征及启示[J]. 煤田地质与勘探，2022，50(9)：32−41. DOI: 10.12363/issn.1001-1986.21.12.0815
引用本文: 于荣泽，王成浩，张晓伟，等. 北美Eagle Ford深层页岩气藏开发特征及启示[J]. 煤田地质与勘探，2022，50(9)：32−41. DOI: 10.12363/issn.1001-1986.21.12.0815
shu
YU Rongze，WANG Chenghao，ZHANG Xiaowei，et al. Development characteristics and enlightenment of Eagle Ford deep shale gas reservoirs in North America[J]. Coal Geology & Exploration，2022，50(9)：32−41. DOI: 10.12363/issn.1001-1986.21.12.0815
Citation: YU Rongze，WANG Chenghao，ZHANG Xiaowei，et al. Development characteristics and enlightenment of Eagle Ford deep shale gas reservoirs in North America[J]. Coal Geology & Exploration，2022，50(9)：32−41. DOI: 10.12363/issn.1001-1986.21.12.0815
shu

北美Eagle Ford深层页岩气藏开发特征及启示

Development characteristics and enlightenment of Eagle Ford deep shale gas reservoirs in North America

    摘要
  • 摘要: 我国四川盆地埋深3 500 m以浅五峰组—龙马溪组超压页岩气已实现规模效益开发，目前正在探索埋深3 500~4 500 m深层页岩气有效开发技术。Eagle Ford为北美新兴深层页岩油气藏，与国内中深层开发区和深层探索区具备一定对比性，其开发技术政策及学习曲线可供参考借鉴。依托页岩气云数据智慧平台对2009—2019年Eagle Ford页岩油气藏干气产区6 223口水平井的钻井、压裂、生产和成本参数进行系统分析。研究显示，Eagle Ford干气产区中深层开发效果大幅优于深层。目前中深层气井平均测深6 013 m，水平段长2 558 m，钻井周期25.3 d，平均段间距50.0 m，加砂强度3.81 t/m，用液强度24.2 m3/m，百米段长最终可采储量(EUR)为677×104 m3，单井钻压成本617万美元，百米水平段长压裂成本13.4万美元；深层气井平均测深6 394 m，水平段长2 423 m，钻井周期33.3 d，平均段间距50.0 m，加砂强度4.03 t/m，用液强度26.9 m3/m，百米段长EUR为520×104 m3，单井钻压成本697万美元，百米水平段长压裂成本16.1万美元。Eagle Ford干气产区工程组织施工效率高，水平井建井周期主要为100~150 d，目前建井周期100 d；不同水平段长对应单位钻压成本产气量呈三角形分布，中深层气井合理水平段长2 300 m，深层气井合理水平段长1 600 m。我国中深层成熟开发区应探索合理水平段长实现效益最大化，深层探索区初期应适当控制水平段长。

     

    Abstract: The large-scale development of shale gas with a buried depth of less than 3 500 m within the overpressure Wufeng-Longmaxi Formation has been realized in Sichuan Basin, and the effective development of shale gas resources with a buried depth of 3 500-4 000 m is being explored currently. Eagle Ford is an emerging deep shale oil & gas reservoir, which is comparable to the domestic medium-deep development regions and deep exploration regions, and its development technology policy and learning curve are available for reference. The parameters of drilling, fracturing, production and cost of 6 223 wells are analyzed in the dry gas production region of Eagle Ford from 2009 to 2019 based on the Shale Gas Cloud Data Intelligent Platform. The research indicates that the medium-shallow shale gas development shows a better performance than that of deep shale gas in the Eagle Ford dry gas production region. The medium-shallow shale gas well has an average measured depth of 6 013 m, a lateral length of 2 558 m, a drilling cycle of 25.3 d, a stage-spacing of 50.0 m, a sanding intensity of 3.81 t/m, a fracturing fluid intensity of 24.2 m3/m, a EUR per 100-meter lateral length of 677×104 m3, the single-well drilling-fracturing cost of 617×104 USD, and the fracturing cost per 100-meter lateral length of 13.4×104 USD. The deep shale gas well has an average measured depth of 6 394 m, a lateral length of 2 423 m, a drilling cycle of 33.3 d, a stage-spacing of 50.0 m, a sanding intensity of 4.03 t/m, a fracturing fluid intensity of 26.9 m3/m, a EUR per 100-meter lateral length of 520×104 m3, the single-well drilling-fracturing cost of 697×104 USD, and the fracturing cost per 100-meter lateral length of 16.1×104 USD. The Eagle Ford dry gas production region is highly efficient in the engineering organization and construction, with the main horizontal well construction circle of 100-150 d and the current single-well construction cycle of 100 d. The relation between lateral length and cumulative gas production per unit drilling-fracturing cost shows a triangular distribution. The reasonable lateral lengths for the medium-shallow and deep wells are 2 300 m and 1 600 m respectively. It is recommended to explore a reasonable lateral length to maximum benefit for domestic medium-shallow scale-development zones, and control the lateral length of deep shale gas wells in the early stage of deep exploration zones.

     

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