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沁南区域煤层气水平井瓜尔胶钻井液技术研究

耿学礼 郑晓斌 苏延辉 敬倩 史斌 李建

耿学礼,郑晓斌,苏延辉,等. 沁南区域煤层气水平井瓜尔胶钻井液技术研究[J]. 石油钻探技术,2022, 50(0):1-6 doi: 10.11911/syztjs.2022038
引用本文: 耿学礼,郑晓斌,苏延辉,等. 沁南区域煤层气水平井瓜尔胶钻井液技术研究[J]. 石油钻探技术,2022, 50(0):1-6 doi: 10.11911/syztjs.2022038
GENG Xueli, ZHENG Xiaobin, SU Yanhui, et al. Research of Guar Gum Drilling Fluid in CBM Horizontal Wells in Qinnan Area[J]. Petroleum Drilling Techniques,2022, 50(0):1-6 doi: 10.11911/syztjs.2022038
Citation: GENG Xueli, ZHENG Xiaobin, SU Yanhui, et al. Research of Guar Gum Drilling Fluid in CBM Horizontal Wells in Qinnan Area[J]. Petroleum Drilling Techniques,2022, 50(0):1-6 doi: 10.11911/syztjs.2022038

沁南区域煤层气水平井瓜尔胶钻井液技术研究

doi: 10.11911/syztjs.2022038
基金项目: 国家科技重大专项 “大型油气田及煤层气开发”(编号:2016ZX05025)部分研究内容
详细信息
    作者简介:

    耿学礼(1983—)男,河北沧州人,2007年毕业于长江大学化学工程与工艺专业,高级工程师,主要从事钻完井液及储层保护技术研究。E-mail:gengxl2@cnooc.com.cn

  • 中图分类号: TE254+.6

Research of Guar Gum Drilling Fluid in CBM Horizontal Wells in Qinnan Area

  • 摘要:

    针对沁南区域15号煤层水平井钻井采用清洁盐水和常规聚合物钻井液施工时的井壁坍塌和储层伤害等问题,在分析储层特征及钻井技术难点的基础上,研发了瓜尔胶钻井液和生物酶破胶液。通过瓜尔胶加量优化和耐盐性能评价,并复配其他处理剂,形成了瓜尔胶钻井液;通过生物酶种类优选、加量优化和助排性能研究,形成了生物酶破胶液。室内试验表明,瓜尔胶钻井液具有良好的流变性和耐盐性能,可大幅提高煤岩抗压强度,在低温下易破胶,破胶后残渣小于300 mg/L,煤岩的渗透率恢复率达85%以上。沁南区域煤层气水平井应用瓜尔胶钻井液后,稳定井壁能力良好;配合生物酶破胶液在实现低温破胶的同时,单井日产能提高15%以上,具有较好的储层保护效果。研究表明,瓜尔胶钻井液可实现煤层长水平段钻井的顺利施工,完钻后可低温破胶,为易塌煤层水平井钻井施工提供了一种新的储层保护方法。

     

  • 图 1  不同加量瓜尔胶的漏斗黏度

    Figure 1.  Relationship between guar gum dosage and funnel viscosity

    图 2  不同KCl加量下的钻井液密度和漏斗黏度

    Figure 2.  Drilling fluid density and funnel viscosity under different KCl dosage

    图 3  不同钻井液对煤岩强度的影响

    Figure 3.  Influence of different fluids on coal and rock strength

    表  1  不同种类的破胶剂破胶效果

    Table  1.   Breaking effect of different kinds of breakers

    破胶剂类型钻井液配方表观黏度/(mPa·s)残渣含量/(mg·L−1
    瓜尔胶钻井液49.0未破胶
    氧化破胶剂瓜尔胶钻井液+0.30%过硫酸铵21.0未破胶
    瓜尔胶钻井液+0.70%过硫酸铵21.0未破胶
    瓜尔胶钻井液+0.10%次氯酸钙4.5未破胶
    瓜尔胶钻井液+0.20%次氯酸钙3.0590
    复合生物酶瓜尔胶钻井液+0.02%Ⅰ型生物酶破胶剂15.0未破胶
    瓜尔胶钻井液+0.05%Ⅰ型生物酶破胶剂4.5115
    瓜尔胶钻井液+0.08%Ⅰ型生物酶破胶剂4.5108
    瓜尔胶钻井液+0.10%Ⅰ型生物酶破胶剂3.0120
    单一生物酶瓜尔胶钻井液+0.02%Ⅱ型生物酶破胶剂6.0未破胶
    瓜尔胶钻井液+0.05%Ⅱ型生物酶破胶剂4.5240
    瓜尔胶钻井液+0.08%Ⅱ型生物酶破胶剂3.0251
    下载: 导出CSV

    表  2  不同助排剂加量下的表面张力

    Table  2.   Surface tension under different dosage of drainage aid

    助排剂加量,%表面张力/(mN·m−1降低率,%
    065
    0.13546.15
    0.22856.92
    0.31872.31
    0.41281.54
    下载: 导出CSV

    表  3  煤岩渗透率损害试验结果

    Table  3.   Permeability damage test of coal and rock

    煤岩
    编号
    污染工作液气测渗透率/mD气测渗透率
    恢复率,%
    束缚水饱和度,%
    污染前污染后
    QS-2-48%KCl盐水0.220.2087.5054.71
    QS-2-5常规聚合物钻井液+破胶液0.210.1047.8663.25
    QS-2-6瓜尔胶钻井液+破胶液0.550.4785.1658.24
    QS-2-9瓜尔胶钻井液+破胶液0.340.2985.0854.50
    下载: 导出CSV
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  • 收稿日期:  2021-08-17
  • 修回日期:  2022-08-28
  • 网络出版日期:  2022-11-08

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