| 长庆气田储气库井大井眼钻井液技术 |
| 投稿时间：2022-07-27 修订日期：2022-11-03 点此下载全文 |
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| 基金项目:中国石油天然气集团有限公司科研项目“恶性井漏防治技术与高性能水基钻井液现场试验”（编号：2020F-45） |
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| 中文摘要:储气库是储备天然气战略资源和天然气生产调配的重要手段，具有良好的社会和经济效益。储气库钻井施工中，由于井眼尺寸大，会出现井眼清洁、井壁失稳、井下漏失等问题。针对上述问题，优化现有钻井液技术，有效减少井下复杂发生，形成了一套储气库井大井眼钻井液井眼清洁、井壁稳定和超分子堵漏技术 。现场应用表明，使用该技术钻井液动切力≥0.3 Pa，满足井眼清洁需求；完钻密度≤1.20 g/cm3，滤失量≤6 mL，保证了井壁稳定；使用超分子凝胶堵漏剂，地层承压能力可提至1.36 g/cm3以上当量密度；处理复杂损失时间占比由原先的10%下降至5.26%，满足储气库建设需求。 |
| 中文关键词:储气库 大井眼 钻井液技术 井眼清洁 煤层防塌 防漏堵漏 |
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| Large borehole drilling fluid technology for gas storage wells in Changqing gas field |
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| Abstract:Gas storage is an important means to reserve natural gas strategic resources and allocate natural gas production, which has good social and economic benefits. There are some problems in the drilling operation of gas storage, such as wellbore cleaning, wellbore instability, downhole leakage, etc. In order to solve above problems, the existing drilling fluid technology is optimized to effectively reduce the downhole complex and form a set of large wellbore drilling fluid technology for gas storage wells. The field tests show that after using this technology, the yield point of drilling fluid is greater than 0.3 Pa, which meets the needs of borehole cleaning; the finished drilling density is less than 1.20 g/cm3, and the filtration loss is less than 6 mL, which ensures the borehole stability;the formation bearing capacity can be increased to the equivalent density of above 1.36 g/cm3 after using the supramolecular gel as sealing agent; the proportion of the lost time to deal with complexity decreasing from 10% to 5.26%, which meets the needs of gas storage construction. |
| keywords:gas storage large borehole drilling fluid technology wellbore cleaning anti-sloughing in coal seam lost circulation prevention and plugging |
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