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首页> 外文会议>Society of Petroleum Engineers Enhaneed Oil Recovery Conference >Simultaneous Injection of Water and Polymer (SIWAP) to Improve Oil Recovery and Sweep Efficiency from Layered Carbonate Reservoirs
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Simultaneous Injection of Water and Polymer (SIWAP) to Improve Oil Recovery and Sweep Efficiency from Layered Carbonate Reservoirs

机译：同时注入水和聚合物（SiWAP），从分层碳酸盐储层中提高采油和扫效效率

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A new EOR scheme is proposed to improve sweep efficiency and oil recovery from heterogeneous mixed to oil-wet carbonate reservoirs. The reservoir under study is a highly heterogeneous and layered reservoir which can be described at a high level as consisting of two main bodies, i.e., an Upper zone and a Lower zone with a permeability contrast of up to a factor of 100. The main recovery mechanism currently applied is water flooding. Field data shows that injected water tends to travel quickly through the Upper zone along the high permeability layers and bypasses the low permeable Lower zone, which results in poor sweep of the Lower zone. It has been demonstrated in earlier publications that this water override phenomenon is caused by capillary forces which act as a vertical barrier and counteract gravity for mixed or oil-wet reservoirs. Polymer flooding has been proposed to improve sweep efficiency in heterogeneous reservoirs. In this paper we propose a new polymer based EOR option in which the water and polymer are injected simultaneously into the Lower and Upper zones, respectively. Injection of polymer into Upper zone serves to minimize cross-flow of injected water from the Lower zone and improves the sweep efficiency of both Upper and Lower zones. Compared to polymer injection alone, a much lower volume of polymer is required which has a significant positive impact on cost of this EOR process. Numerical simulations have been performed using a history matched sector model. The model forecasts show that significant sweep improvement of the Lower zone is achieved compared to conventional water or gas injection. The results also show that the process is stable and robust to reservoir lateral and vertical heterogeneity, variation in polymer viscosity and that the amount of polymer that is used can be limited by only injecting a polymer slug of 0.1 to 0.2 pore volume. It is also shown that the process can be implemented in secondary and tertiary mode, where in tertiary mode earlier handling of production water is required. Experimental work shows there are promising polymers that may be able to withstand the high reservoir temperature, high salinity and high concentration of divalent ions in the reservoir under study.
机译：提出了一种新的EOR方案，提高从非均相混合到油湿碳酸盐储层的扫描效率和油回收。在研究中的储库是一种高度异构和层状储层，其可以在高水位中描述，如两个主体，即上部区域和下部区域，其渗透率对比度为100倍。主要恢复目前申请的机制是水洪水。现场数据表明，注入的水倾向于沿着高渗透层迅速行进，并绕过低可渗透的下部区域，这导致下部区域的扫描不良。在早期的出版物中已经证明了这种水覆盖现象是由毛细管力引起的，该力是用作垂直屏障的垂直屏障和混合或油湿储存器的重力。已经提出了聚合物洪水来提高异构储层中的扫描效率。在本文中，我们提出了一种新的基于聚合物的EOR选项，其中水和聚合物同时注入下部和上部区域。将聚合物注入上部区域，以最小化来自下部区域的注入水的横流，并提高上部和下部区域的扫描效率。与单独的聚合物注射相比，需要大量的聚合物，其具有对该EOR过程的成本具有显着的阳性影响。使用历史匹配的扇区模型进行了数值模拟。模型预测表明，与常规水或气体注入相比，实现了下部区域的显着扫描改善。结果还表明，该方法对贮存器横向和垂直异质性稳定且稳健，聚合物粘度的变化，并且通过仅注入0.1至0.2孔体积的聚合物块来限制所使用的聚合物的量。还示出了该过程可以在次级和三级模式下实现，其中在第三型模式中需要在提前的生产水处理中。实验工作表明，有希望的聚合物可以能够承受在研究中储层中的高储层温度，高盐度和高浓度的二价管离子。

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