一种快速钻井废弃物全回收技术探讨

Discussion on A Fast Full Recovery Technology for Drilling Waste

为解决快速钻井过程中钻速提升导致钻完井废弃物回收处置能力不足的问题,通过采用改进循环系统,设计密封快装井口,井口拆装废浆转移技术,建立全封闭井口,并通过井身结构优化、可重复利用钻井液等手段控制源头产废量。通过建模计算钻屑传输量、传输距离并研发出一套降阻防堵技术,形成一套能够远距离密闭传输工艺,实现自升式钻井平台废弃物与移动式处置中心远距离传输,再以自升式钻井平台场地为设计基础,实现移动式处置中心在线处置和小型一体化处置设备现场减量配套技术。该技术在新快速钻井中应用效果证明,全封闭钻井技术能够实现允许机械钻速大幅度提升75%以上,并确保现场“零”污染事故发生,是受限排放区快速钻井的有效手段。

To solve the problem of insufficient recovery and disposal capacity of drilling and completion waste caused by the increase in drilling speed during the rapid drilling process,an improved circulation system is adopted,sealed quick installation wellhead is designed,and waste slurry transfer technology is used for wellhead disassembly and assembly.A fully enclosed wellhead is established,and the source waste production is controlled through methods such as wellbore structure optimization and reusable drilling fluid.By modeling and calculating the transmission amount and distance of drilling cuttings,a set of resistance reduction and blockage prevention technology has been developed,forming a long-distance closed transmission process that can achieve longdistance transmission of self elevating drilling platform waste and mobile disposal centers.Based on the design of the self elevating drilling platform site,the supporting technology for online disposal of mobile disposal centers and on-site reduction of small integrated disposal equipment has been achieved.The application effect of this technology in new rapid drilling has proven that fully enclosed drilling technology can achieve a significant increase in mechanical drilling speed of over 75%,and ensure the occurrence of“zero”pollution accidents on site.It is an effective means of rapid drilling in restricted emission area.