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首页> 外文会议>IADC/SPE Drilling Conference and Exhibition >Unitized Wellheads for Rajasthan Onshore Development Drilling-Proven Safer and Economical Wellhead Design Compared to Bowl and Slip Wellheads
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Unitized Wellheads for Rajasthan Onshore Development Drilling-Proven Safer and Economical Wellhead Design Compared to Bowl and Slip Wellheads

机译：与碗和滑动井口相比，Rajasthan Onshore开发钻探的井口钻探验证更安全，经济的井口设计

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This paper describes the safety and cost benefits as an onshore operator shifts from conventionally stacked (i.e. bowl and slip type wellheads) to unitized wellhead systems while transitioning from exploration to development phase. There was a paradigm shift in operational safety coupled with multi-million dollars of cost savings during the course of development drilling spanning across 500+ wells. This paper draws a detailed comparison between conventional and unitized wellheads elaborating on the safety as well as operational aspects. The timing of full-fledged deployment of unitized systems by the operator coincided with development of the operator$s onshore Rajasthan block. The unitized wellheads had been previously deployed by the operator in a number of offshore platform wells. Hence, the operator had sufficient data to demonstrate that the overall economics was in favor of using unitized wellheads. Until 2007, mostly conventional wellheads were used by the operator across nearly 140 exploration wells. Thereafter, unitized wellheads were extensively used during development drilling in Rajasthan post 2009. The unitized wellhead plays a major role in ensuring two barriers throughout drilling and completion operations, which is a requirement in the NORSOK standards. Through careful scope definition and technical evaluation, the operator had ensured incorporation of a number of safety/operational critical specifications of the unitized wellheads including surface casing hanger landing rings, diverter adaptors, mandrel casing hangers, integral lockdown for casing hanger pack-offs, metal-end-cap seals, multi-stage compact bowls, quick make-up BOP adaptors, tubing hangers with integral body seals, TWCV (Two-way-check-valve) profiles, bonnet-LMV (Lower-master-valve) interface with dual seal provision etc. In contrast, the slip-and-bowl systems are associated with time consuming and relatively risky operations such as casing string space-outs, wait-on-cement, hot cuts, cold cuts, welding of riser/wellhead, nippling down of BOP with less than two physical barriers, BOP/wellhead housing installation after every hole section, dependence on cement sheath as sole barrier, risk of leaking lock down screws etc. The time saving unitized wellhead has translated into well construction cost savings for Rajasthan development wells drilled by the operator. Though the cost of unitized wellheads is approximately 20%-40% higher than the conventional wellheads, the rig time savings and the resultant cost savings clearly offset the higher cost of unitized equipment/service in the Rajasthan onshore environment, both in development and exploration drilling. This is a step change from the previous belief that the unitized systems would only be economical for offshore operations. In addition, the usage of unitized wellheads offers safety advantages in terms of maintaining well barriers and brings greater efficiency and quality into well construction operations.
机译：本文介绍了作为陆上运营商从传统上堆叠（即碗和滑动型井口）的惯性换档，以将井口系统转换为单位，同时从探索到发展阶段。在开发钻井跨越500多家井中的开发钻井过程中，运营安全的范式转换加上了多百万美元的成本节约。本文在阐述了安全性和操作方面的常规和统一井口之间进行了详细的比较。运营商的全面组合系统的定时恰逢运营商$ S陆上拉贾斯坦块的开发。汇总的井口以前在许多海上平台井中部署了操作员。因此，操作员有足够的数据来证明整体经济学有利于使用已合化的井口。直到2007年，操作员在近140次勘探井上使用常规井口。此后，在2009年拉贾斯坦邦的开发钻井期间广泛使用了一体化的井口。汇编井口在确保整个钻井和完成操作的两个障碍方面发挥了重要作用，这是Norsok标准的要求。通过仔细的范围定义和技术评估，运营商确保纳入了一批安全性/操作关键规范，包括地表套管着陆环，转向器适配器，心轴套管，套管吊架包装件的整体锁定，金属 - 盖帽密封件，多级紧凑型碗，快速化妆瓶适配器，带整体密封的管道衣架，TWCV（双向校验阀）型材，Bonnet-LMV（下主阀）接口双密封条件等相比之下，滑动和碗系统与耗时且相对冒险的操作相关，诸如外壳弦外消耗，等待水泥，热切割，冷切割，立管/井口的焊接，利用少于两个物理障碍物，BOP /井口外壳安装在每个孔部分后，依赖水泥护套作为唯一的屏障，锁定螺钉等的风险。节省了汇总的井口的时间已翻译运营商钻取的Rajasthan开发井的井建筑成本节省。虽然单位井口的成本比传统的井口，钻机时间节省的成本高约20％-40％，但显然在开发和探索钻探中明确抵消了拉贾斯坦陆上环境中的单位设备/服务的更高成本。这是从前一个相信的步骤改变，即单位系统仅适用于海上业务。此外，在保持良好的障碍方面，使用单元化井口的使用提供了安全优势，并将更高的效率和质量带入良好的施工操作。

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