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渝东南常压页岩气工程工艺技术进展及下一步攻关方向

姚红生 房启龙 袁明进 张壮

姚红生, 房启龙, 袁明进, 张壮. 渝东南常压页岩气工程工艺技术进展及下一步攻关方向[J]. 石油实验地质, 2023, 45(6): 1132-1142. doi: 10.11781/sysydz2023061132
引用本文: 姚红生, 房启龙, 袁明进, 张壮. 渝东南常压页岩气工程工艺技术进展及下一步攻关方向[J]. 石油实验地质, 2023, 45(6): 1132-1142. doi: 10.11781/sysydz2023061132
YAO Hongsheng, FANG Qilong, YUAN Mingjin, ZHANG Zhuang. Progress of normal-pressure shale gas engineering technology in southeast Chongqing and the research direction of next steps[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(6): 1132-1142. doi: 10.11781/sysydz2023061132
Citation: YAO Hongsheng, FANG Qilong, YUAN Mingjin, ZHANG Zhuang. Progress of normal-pressure shale gas engineering technology in southeast Chongqing and the research direction of next steps[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(6): 1132-1142. doi: 10.11781/sysydz2023061132

渝东南常压页岩气工程工艺技术进展及下一步攻关方向

doi: 10.11781/sysydz2023061132
基金项目: 

国家科技重大专项 2016ZX05061

中国石化科技开发部项目 P19017-3

详细信息
    作者简介:

    姚红生(1968—),男,正高级工程师,从事油气资源勘探开发研究及管理工作。E-mail:yaohs.hdsj@sinopec.com

  • 中图分类号: TE37

Progress of normal-pressure shale gas engineering technology in southeast Chongqing and the research direction of next steps

  • 摘要: 渝东南地区常压页岩气区块处于盆缘过渡带—盆外褶皱区,具有构造复杂、应力差异大、压力系数低等地质特点,给工程工艺提效增产带来巨大挑战。该区浅表层缝洞发育、漏失层位多,钻完井周期长;构造应力变化快、差异系数大,压裂难以形成复杂缝网;地层能量不足、排液效率低,影响气井连续稳定生产。为此以“四提”为目标,创新实践关键技术,工程工艺持续创效。钻井工程围绕“提速、提效、降本”攻关形成以井身结构优化、强化参数钻井为主,设备、工具一体化配套的常压页岩气钻完井技术,机械钻速年均提高14.90%,钻完井周期降幅10.67%,钻井成本降幅7.64%,刷新同期多项纪录。压裂工程围绕“增效降本”,通过“适度密切割+暂堵转向”提升裂缝复杂度,“高强度加砂+砂陶粒径组合”促进缝网多尺度有效支撑,集成应用低成本压裂材料与提速降本设备工具,形成“复杂缝网+经济型材料+智能压裂装备”的特色压裂工艺及配套,单井归一千米最终可采储量(EUR)由0.34亿立方米提升至0.45亿立方米,费用下降34.6%。排采工程以“全生命周期精细管理、延缓递减、挖潜增效”为目标,攻关建立了早期优选管柱、中期泡排+压缩机降压开采、后期单管射流泵、强力泵+尾管等机械排采的全生命周期排水采气技术体系,实现了分区分类分阶段精准施策,老井年递减率降低2.1%,全气田生产时率从95.9%提升至98.7%。通过工程工艺的全流程攻关,有力支撑了渝东南常压页岩气的效益开发,也可为其他常压页岩气的高效开采提供借鉴。

     

  • 图  1  渝东南南川地区SY9-2HF井身结构方案

    Figure  1.  Wellbore structure scheme of SY9-2HF in Nanchuan area, southeast Chongqing

    图  2  渝东南南川地区SY9-2HF井不同轨道设计方法钻进效果分析

    Figure  2.  Drilling effect of different track design methods of well SY9-2HF in Nanchuan area, southeast Chongqing

    图  3  多人工裂缝条件下应力场变化

    Figure  3.  Variation of stress field under multiple artificial fractures

    图  4  不同射孔模式下的多簇裂缝扩展形态

    Figure  4.  Multi-cluster fracture propagation patterns under different perforating modes

    图  5  不同砂液比下的裂缝导流能力

    Figure  5.  Fracture conductivity under different sand-to-liquid ratios

    图  6  不同压裂模式下的改造面积

    Figure  6.  Remodeling areas under different fracturing modes

    图  7  渝东南常压页岩气支撑剂选择图版

    Figure  7.  Selection chart of normal-pressure shale gas proppant in southeast Chongqing

    图  8  不同井底停泵压力下不同组合测试产量

    Figure  8.  Tested yield of different combinations at different bottom-hole shutdown pressures

    图  9  渝东南LY1HF井“强力泵+尾管”举升工艺试验前后效果对比

    Figure  9.  Comparison of the effect before and after the lifting process test of "heavy-duty pump + liner" of well LY1HF in southeast Chongqing

    表  1  渝东南南川地区超长水平井钻井技术指标

    Table  1.   Technical indexes of ultra-long horizontal well drilling in Nanchuan area in southeast Chongqing

    井号 完钻井深/m 水平段长/m 钻井周期/d 完井时间/d 钻完井周期/d 平均机械钻速/(m/h)
    SY9-2HF 6 455.00 3 583.00 45.50 6.83 52.33 11.03
    SY9-6HF 6 780.00 3 601.00 61.09 8.69 69.78 9.20
    SY9-3HF 6 945.00 4 035.00 51.99 7.88 59.87 12.65
    下载: 导出CSV

    表  2  钻井参数优化方案表

    Table  2.   Drilling parameter reinforcement

    钻头尺寸/mm 地层 推荐参数
    钻压/kN 顶驱转速/(r/min) 排量/(L/s)
    406.4 嘉陵江组—飞仙关组 120~160 60~70 70~75
    311.1 飞仙关组—韩家店组 160~180 60~70 65~70
    215.9 韩家店组—龙马溪组 160~170 60~70 35~37
    215.9 龙马溪组 160~170 50~60 35~37
    下载: 导出CSV

    表  3  不同埋深不同配方减阻水减阻效果

    Table  3.   Water drag reduction effect of different formulas at different depth

    序号 埋深/m 降阻水配方 表观黏度/(mPa·s) 降阻率/%
    1 <2 500 0.03%降阻剂+0.02%杀菌剂 4.8 68.9
    2 2 500~<3 000 0.05%降阻剂+0.02%杀菌剂 6.8 73.2
    3 3 000~<3 500 0.07%降阻剂+0.02%杀菌剂 9.5 75.4
    4 3 500~<4 000 0.10%降阻剂+0.02%杀菌剂 10.3 76.1
    下载: 导出CSV

    表  4  压裂设备升级历程

    Table  4.   Fracturing equipment upgrade process

    类别 第一阶段 第二阶段 现阶段
    压裂模式 柴油压裂 全电压裂 智能压裂
    型号 2500型 6000型 6000型
    压裂管汇 2~7寸管汇/大通径 2~7寸管汇/大通径 130~180直连管汇
    压裂段费/万元 60 40 28
    人员数量/人 48 24 10
    下载: 导出CSV
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出版历程
  • 收稿日期:  2023-09-10
  • 修回日期:  2023-10-24
  • 刊出日期:  2023-11-28

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