Pilot Test of Deep Profile Controlling and Sweep Improvement Based on Plugging Agent Location Optimization in Offshore Oilfield

Hongfu Shi, Kuiqian Ma, Cunliang Chen, Fei Shi, Xiaodong Han
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Abstract

After the reservoir enters the medium-high water-cut period, due to the heterogeneity of the reservoir, the difference of fluid mobility, and the difference in injection and production, large water flow channels are gradually formed in the formation, which result in fixed streamline in the formation, and the inefficient or ineffective water circulation. Ineffective injection water circulation severely inhibits water flooding effect. Conventional tapping measures can’t change the problem of ineffective water circulation. However, the profile control technology changes the flow direction of subsequent injected water by plugging the high permeability layer or large pores, improving the water injection profile, and increasing the formation water retention rate, so as to expand the swept volume. Therefore, profile controlling technology has always been an important method water control and oil stabilization technologies for the reservoirs with thief zones. The success or failure of profile control measures depends to a large extent on thief zones identification and its description, sensitivity analysis of plugging agent performance, scientific and reasonable profile control decision-making and optimization, in addition to selection of candidate wells, optimization of construction parameters, effect prediction and effect evaluation.
基于堵剂位置优化的海上油田深部调剖及波及改进中试
储层进入中高含水期后,由于储层的非均质性、流体流动性的差异以及注采的差异,在地层中逐渐形成较大的水流通道,导致地层流线固定,水循环效率低下或无效。注水循环不良严重抑制了水驱效果。常规的抽水措施无法改变水循环不畅的问题。而调剖技术通过封堵高渗层或大孔隙,改善注水剖面,提高地层保水率,改变后续注入水的流动方向,从而扩大波及体积。因此,调剖技术一直是含贼层油藏的重要治水稳油技术。除候选井的选择、施工参数的优化、效果预测和效果评价外,调剖措施的成败在很大程度上取决于贼层的识别和描述、堵剂性能的敏感性分析、科学合理的调剖决策和优化。
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