Drilling and Completion Waste Reutilization and Zero Discharge Technology Used in China Bohai Bay

Kunjian Wang, Pengfei Liu, Xinxin Hou, Pan Wang, Pei Zhu, Mingxuan Hao, Dejiang Li, Qisheng Tang, Qing Wang, Wenchen Ge, Xu Zeng, Hao Zhang, Shihao Zhang, Kejin Chen
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引用次数: 3

Abstract

With the increasingly stringent national environmental rules, waste produced in drilling and completion process is forbidden to be discharged into the Bohai Bay or reinjected into the formation. The current disposal method of drilling and completion waste in Bohai Oil field has some problems such as high cost, low efficiency and high HSE management and control risk. Faced with these problems, drilling and completion waste reutilization and zero discharge technology has been developed and applied in this region. In order to reutilize drilling and completion waste which include cuttings circulated from formation, wasted drilling and completion fluids, the following aspects are carried out: Firstly, drilling platform is upgraded to meet the zero discharge requirement: solid control system is modified, cuttings closed transfer system and cuttings treatment system are equipped on the platform to collect and dispose the waste. Meanwhile, recovery and disposal capacity to support different spud drilling are assessed: cuttings transport capacity is up to 15m3/h, which can meet the highest requirements of 12-1/4″ hole drilling when ROP is up to180m/h. Secondly, the well profile is downsized to reduce the production of cuttings, mud and other wastes from the root, which can also improve efficiency and yield cost. The field application shows that the amount of the waste has been reduced by 41.39%, 39.86% and 41.52% in first, second and third spud drilling, and average ROP is 35%, 28%, 42% higher than similar wells drilled before. Lastly, in drilling and completion fluids system optimization and reutilization aspects, environmentally friendly drilling and completion fluids with low solid content are developed. The experiment shows that the properties of the liquid phase after solid-liquid separation can be reused, and the solid phase with low water content is easy to pack and transport back to land. Drilling and completion waste reutilization and zero discharge technology introduced in this paper has been successfully applied in more than 40 wells, and the volume of waste drilling fluid is reduced by 80%, which is a trade-off between zero discharge and well construction cost. This technology can also be applied in other offshore oilfield which is inevitable as the environmental rules become more and more strict.
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渤海湾钻井完井废弃物资源化利用及零排放技术
随着国家环保法规的日益严格,钻井完井过程中产生的废弃物被禁止排入渤海湾或回注地层。渤海油田现行钻完井废弃物处理方法存在成本高、效率低、HSE管控风险大等问题。面对这些问题,钻完井废弃物再利用零排放技术在该地区得到了发展和应用。为了回收利用钻完井废弃物,包括地层循环的岩屑、废弃的钻完井液等,首先对钻井平台进行升级改造,达到零排放要求,改造固控系统,在平台上安装岩屑封闭输送系统和岩屑处理系统,对废弃物进行收集和处置。同时,对支持不同钻速的钻屑回收处置能力进行了评价:钻屑输送能力可达15m3/h,可满足ROP高达180m/h时12-1/4″井眼钻井的最高要求。其次,减小井型以减少岩屑、泥浆和其他来自根部的废物的产生,这也可以提高效率和产量成本。现场应用表明,一钻、二钻、三钻分别减少了41.39%、39.86%、41.52%的废液量,平均机械钻速比以往同类井分别提高了35%、28%、42%。最后,在钻完井液体系优化和再利用方面,开发了低固含量的环保型钻完井液。实验表明,固液分离后的液相特性可重复利用,且含水量低的固相易于打包运输回陆地。本文介绍的钻完井废弃物再利用零排放技术已在40余口井中成功应用,废钻井液体积减少80%,实现了零排放与建井成本之间的平衡。随着环境法规的日益严格,该技术也可应用于其他海上油田。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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