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顺北油气田奥陶系破碎性地层油基钻井液技术

吴雄军,  林永学,  宋碧涛,  金军斌,  董晓强

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文章导航 > 钻井液与完井液  > 2020 >  37(6): 701-708
吴雄军, 林永学, 宋碧涛, 金军斌, 董晓强. 顺北油气田奥陶系破碎性地层油基钻井液技术[J]. 钻井液与完井液, 2020, 37(6): 701-708. doi: 10.3969/j.issn.1001-5620.2020.06.004
引用本文: 吴雄军, 林永学, 宋碧涛, 金军斌, 董晓强. 顺北油气田奥陶系破碎性地层油基钻井液技术[J]. 钻井液与完井液, 2020, 37(6): 701-708. doi: 10.3969/j.issn.1001-5620.2020.06.004
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WU Xiongjun, LIN Yongxue, SONG Bitao, JIN Junbin, DONG Xiaoqiang. Oil Base Drilling Fluid Technology for Drilling Broken Ordovician Formation in Shunbei Block[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(6): 701-708. doi: 10.3969/j.issn.1001-5620.2020.06.004
Citation: WU Xiongjun, LIN Yongxue, SONG Bitao, JIN Junbin, DONG Xiaoqiang. Oil Base Drilling Fluid Technology for Drilling Broken Ordovician Formation in Shunbei Block[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(6): 701-708. doi: 10.3969/j.issn.1001-5620.2020.06.004
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顺北油气田奥陶系破碎性地层油基钻井液技术

doi: 10.3969/j.issn.1001-5620.2020.06.004

  • 1. 中国石化石油工程技术研究院, 北京 100101;

  • 2. 页岩油气富集机理与有效开发国家重点实验室, 北京 100101

基金项目: 

国家重点研发计划课题“井筒稳定性闭环响应机制与智能调控方法”（2019YFA0708303）；中国博士后科学基金项目“顺北油气田窄密度窗口井筒强化技术研究”（2019M660935）；国家自然科学基金项目“高温高压油气安全高效钻完井工程基础理论与方法”（U19B6003-05）

详细信息
    作者简介:

    吴雄军，副研究员，博士，1984年生，毕业于中国石油大学（华东）油气井工程专业，现在从事钻井液技术研究工作。电话（010）84988205；E-mail：wuxj.sripe@sinopec.com

  • 中图分类号: TE254.3

Oil Base Drilling Fluid Technology for Drilling Broken Ordovician Formation in Shunbei Block

  • 1. SINOPEC Research Institute of Petroleum Engineering, Beijing 100101;

  • 2. State Key Laboratory of Shale Oil and Gas Enrichment Mechanism and Effective Development, Beijing 100101

    摘要
  • 摘要: 针对顺北多口超深井采用水基钻井液钻遇奥陶系地层时井壁失稳和井漏并存的技术难题，通过井壁失稳机理分析，设计合成了具有三头双尾结构的Gemini型高温乳化稳定剂和支化型流型调节剂，采用微胶囊化处理方法研制了一种可在156℃以上的温度下激发后膨胀5.37倍以上的温度敏感型膨胀性堵漏材料，开发了一种抗高温强封堵低黏高切油基钻井液体系。室内评价结果表明，该体系抗温不小于180℃，所形成的油包水乳化液滴尺寸为1.2～26.9 μm，具有较宽的粒径分布，高温高压滤失量为2.4 mL ；塑性黏度不大于40 mPa·s，动塑比为0.31～0.40 Pa/mPa·s，与传统油基钻井液相比，塑性黏度降低10%～15%，动切力提高15%～25%，表现出优异的低黏高切特性和微裂缝的匹配性封堵能力。该体系在顺北Y井进行了现场应用，破碎性地层平均井径扩大率仅为7.77%，钻井过程中除出现一次短暂的放空性漏失外，未见其他明显漏失，避免了奥陶系破碎性地层井壁失稳，减少了裂缝性储层段油基钻井液损耗，助力了亚洲陆上最深定向井纪录的创造和顺北油气资源的提速、提效开发。

     

    Abstract: Several ultra-deep wells were drilled in the Shunbei Block with water base drilling fluids, resulting in borehole wall collapse and mud losses in the Ordovician formation. Based on the analyses of the mechanisms of borehole wall collapse, a Gemini type high temperature emulsion stabilizer and a branched flow pattern additive with three heads and two tails have been developed. Using microencapsulation treatment method, a temperature-sensitive expandable lost circulation material was developed. This lost circulation material, when excited at 156 ℃, can expand to a volume that is 5.37 times of its original volume. With these additives, a high temperature oil base drilling fluid was formulated. This drilling fluid has low viscosity, high gel strength and strong sealing capacity. Laboratory evaluation results showed that this drilling fluid can be used at 180 ℃. The sizes of the emulsified droplets are in a range of 1.2-26.9 μm. The HTHP filter loss, plastic viscosity and yield point/plastic viscosity ratio of the drilling fluid are 2.4 mL, ≤40 mPa.s and 0.31-0.40 Pa/mPa·s, respectively. The plastic viscosity of the new oil base drilling fluid is 10%-15% lower than that of the conventional oil base drilling fluids, while the yield point of the new oil base drilling fluid is 15%-25% higher than that of the conventional oil base drilling fluids, demonstrating an excellent low viscosity high yield point characteristics and capabilities of plugging microfractures by size matching. Application of the new oil base drilling fluid in the well Shunbei-55X showed that the average percent hole enlargement in broken formations was only 7.77%. Apart from a momentary mud loss into a cave during drilling, there was no other obvious mud losses encountered. Use this new oil base drilling fluid, collapse of the Ordovician formation during drilling was avoided, mud losses into the fractured reservoir were reduced. It also helps set a record of the deepest onshore directional well in Asia and develop the oil and gas resources in Shunbei Block with high speed and high efficiency.

     

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出版历程
  • 收稿日期:  2020-09-29
  • 刊出日期:  2020-12-28

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