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深水表层套管的下入深度决定了套管鞋的承压能力和下一井段钻井作业的安全密度窗口,直接影响井身结构和套管层次。针对海外某深水区块上部井段井壁稳定性差、钻井复杂情况频发等问题,进行Pump&dump技术应用可行性分析,以增加表层无隔水管井段钻井深度,优化井身结构,降低作业工期和费用。通过水力学分析确定表层钻井所需钻井液体积等关键参数,并对钻井工期和费用进行对比,探索该技术应用于现场的可行性,为深水钻井降本增效提供新的思路和方法。研究表明,Pump&dump技术是增加表层钻井深度、优化井身结构切实可行的方法之一,每口井可节约费用上千万美元,建议在地层可钻性较好、表层套管增加下深不超过300m的目标井中考虑使用。
The penetration depth of the deepwater casing determines the bearing capacity of the casing shoes and the safety density window for the next well drilling operation, which directly affects the well structure and the casing level. In view of the poor stability of borehole wall and frequent complicated drilling conditions in the upper well section of overseas deepwater block, the feasibility analysis of Pump & dump technology is applied in order to increase the drilling depth of non-riser segment in surface layer, optimize the well structure and reduce the construction duration and cost. Through hydraulic analysis, the key parameters such as the volume of drilling fluid required for surface drilling are determined. The drilling duration and cost are compared to explore the feasibility of applying the technology to the site and provide new ideas and methods for cost reduction and efficiency enhancement of deep-water drilling. The research shows that Pump & dump technology is one of the methods to increase the surface drilling depth and optimize the well structure. Each well can save tens of millions of dollars. It is suggested that the drillability of the formation should be better and the surface casing should not exceed 300m target wells to consider using.