水平定向钻穿越水敏性地层冒浆预测及防控
Prediction and prevention of mud-bursting during horizontal directional drilling through water-sensitive strata
郑华1
作者信息
- 1. 福州市水务工程有限责任公司,福建 福州 350025
- 折叠
摘要
非开挖水平定向钻穿越施工中,孔内压力过高会造成地表隆起冒浆事故,严重污染周围环境,造成重大经济损失.以福州市塘坂引水工程供水管道水平定向钻穿越项目为例,考虑工程水敏性软化造浆地层,基于Mohr-Coulomb准则构建了针对水敏弱膨胀地层的孔内最大允许泥浆压力计算模型,并通过现场位移监测数据验证了模型的正确性;随后通过现场应用校验了非开挖水平定向钻穿越水敏弱膨胀地层的冒浆防控技术可靠性.研究结果表明:所推导的计算模型比现有其他孔内允许泥浆压力预测模型更加适用于水敏性软化造浆地层;水平定向钻穿越冒浆防控技术应以孔内泥浆压力控制为主,结合泥浆技术、工艺优化防止憋压,最后辅以局部薄弱点加强、定向控制冒浆等手段进一步加强冒浆预防措施,保障施工安全.
Abstract
In the construction of non-excavation horizontal directional drilling,the high pressure in the hole can cause surface uplift and slurry accident,seriously polluting the surrounding environment,and causing major economic losses.Taking the horizon-tal directional drilling crossing project of water supply pipeline in Tangban Water Diversion Project in Fuzhou City as an example,considering that the project is located in water-sensitive softening slurry formation,a targeted calculation model of maximum al-lowable mud pressure in the hole was constructed based on Mohr-Coulomb criterion,and the correctness of the model was veri-fied by field displacement monitoring data.Then,the reliability of slurry prevention and control technology for non-excavation horizontal directional drilling through water-sensitive weak expansive strata was verified by field application.The results showed that the constructed calculation model in this paper was more suitable for water-sensitive softening slurry formation than other ex-isting prediction models.The mud-bursting prevention should focus on the control of mud pressure in the hole,while combining with mud preparing technology and process optimization to prevent pressure suppressing,and finally supplemented by local weak points strengthening,directional control on slurry and other means,so as to ensure construction safety.
关键词
非开挖施工/水平定向钻/水敏性地层/冒浆Key words
non-excavation construction/horizontal directional drilling/water-sensitive formation/mud-bursting引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据