Drilling Fluid Technology for Reservoir Protection in Offshore Thermal Production Well
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摘要: 渤海油田稠油资源丰富,热采是稠油开发的主要手段,为适应特殊热采开发环境,充分利用非常规稠油特点及高温注热工艺特性,降低成本,开展稠油热采井钻井液储层保护技术研究顺应形势需求。以渤海旅大5-2N稠油热采井为例,结合油藏独特的物理性质,分析潜在敏感性损害因素,通过强抑制剂优选、热降解性能评价、密度优化、封堵剂优化和储层保护性能评价,形成了适合稠油热采水平井的改进型钻开液体系。该体系抑制性强,与地层流体配伍性良好,高温条件下降解产物为黑色碳,岩心渗透率恢复值大于85%,具有良好的储层保护效果,同时可降低成本40%。Abstract: Thermal recovery is presently the main method of producing heavy oil in Bohai oilfeld where heavy oil reserves are abundant. Drilling fluid technology aimed at reservoir protection in thermal production well has been developed in such a special thermal development environment to make the full use of the nonconventional heavy oil characteristics and the high temperature thermal injection technique, and to cut the operation cost. The thermal production heavy oil well Lvda5-2N in Baohai oilfeld is taken as an example in this paper. In developing a modifed drilling fluid suitable for drilling a thermal production horizontal heavy oil well, the unique physical properties of the reservoir were taken into account and the potential formation damage factors-all kinds of sensitivities-were analyzed. Selection of additives with strong inhibitive capacity, evaluation of thermal degradation of additives, optimization of the mud weight, optimization of plugging agents and evaluation of reservoir protection have all been performed through laboratory experiments. The drilling fluid developed has strong inhibitive capacity and good compatibility with formation fluids. The degradation product of the drilling fluid at high temperature is black carbon. The permeability recovery of a core flooded with this drilling fluid is greater than 85%, indicating that the drilling fluid has good reservoir protection capacity. Using this drilling fluid, the cost was reduced by 40%.
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