Block 61 Drilling Fluids Optimization Journey

Majda Jan Mohammad, Muneer Al Noumani, I. Cameron, Younis Al Masoudi
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Abstract

BP operates Khazzan & Ghazeer fields in the Sultanate of Oman with the aim to deliver safe, reliable and efficient wells. Efficiencies within drilling fluids design form part of a greater continuous improvement cycle to well delivery cost. With fluids spend contributing to a significant portion of the executed well cost (typically 15 % in Oman), fluids design changes hold the potential to yield positive cost savings (where well performance is maintained). This paper presents the areas of fluids design which were explored to reduce fluids spend as part of the continuous improvement cycle. Combined, the changes to fluids design evolved to reduce the fluids cost of Barik vertical wells to 6% of total well cost. All avenues of fluids design and the costs associated with the fluids operation in Oman were viewed as being in scope for change to maintain overbalance hydrostatic pressure on fluids spend. The methodology employed to reduce fluids spend can be described in four steps as per continuous improvement roadmaps; identify the cost saving project, the key enablers which allow the cost saving to be realized, risk/reward analysis where low risk/high reward projects were accelerated as priority and placed to the front of the queue for field trial and where a trial outcome is positive, the change is introduced permanently to the operation. This process worked well in continuously pushing fluid performance and reducing the fluids spend in Oman. The scope of change to fluids design was wide, with each ‘value adding project’ providing its own cumulative cost benefit. The projects which contributed to significantly reducing the overall fluids spend in Oman focused on personnel, fluid type selection, fluids formulation optimization, wellbore strengthening, fluid consumption and recycling, drilling fluids practice and brine selection. Reductions in fluids spend were accompanied with an improved well performance. Well delivery times being continuously observed to improve throughout the campaign (63 days vs 42 days). Whilst the fluids design is not directly responsible for this outcome, it does highlight that the changes made to fluids design positively influenced the improved well delivery performance. The drilling fluids optimization initiatives resulted in significant time and cost saving thus reduction in overall Barik vertical well drilling cost. Drilling fluids cost is reduced by over 55% without impact on safety and drilling performance.
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61区块钻井液优化之旅
BP在阿曼苏丹国运营Khazzan & Ghazeer油田,旨在提供安全、可靠和高效的油井。钻井液设计的效率是油井交付成本持续改进周期的一部分。在阿曼,流体成本占到已执行井成本的很大一部分(通常为15%),因此,流体设计的改变有可能产生积极的成本节约(在保持井性能的情况下)。本文介绍了流体设计领域的探索,以减少流体的消耗,作为持续改进周期的一部分。综上所述,流体设计的变化将Barik直井的流体成本降低到总成本的6%。在阿曼,流体设计的所有途径和与流体作业相关的成本都被认为是可以改变的,以保持流体静压对流体支出的过平衡。根据持续改进路线图,减少流体消耗的方法可以分为四个步骤;确定节省成本的项目,实现成本节约的关键因素,风险/回报分析,将低风险/高回报的项目作为优先级加速,并放在现场试验队列的前面,如果试验结果是积极的,则该变化将永久引入操作中。在阿曼,该工艺在持续提高流体性能和减少流体消耗方面效果良好。流体设计的变化范围很广,每个“增值项目”都提供了自己的累积成本效益。在阿曼,有助于显著降低总体流体支出的项目主要集中在人员、流体类型选择、流体配方优化、井筒强化、流体消耗和回收、钻井液实践和盐水选择等方面。随着钻井液消耗的减少,井的性能也得到了改善。油井交付时间在整个活动期间持续改善(63天vs 42天)。虽然流体设计并不是直接导致这一结果的原因,但它确实强调了流体设计的改变对改善井的交付性能产生了积极的影响。钻井液优化方案大大节省了时间和成本,从而降低了Barik直井的总体钻井成本。在不影响安全和钻井性能的情况下,钻井液成本降低了55%以上。
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