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首页> 外文期刊>Journal of natural gas science and engineering >Experimental study of water shutoff gel system field parameters in multi-zone unfractured gas-condensate reservoirs
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Experimental study of water shutoff gel system field parameters in multi-zone unfractured gas-condensate reservoirs

机译：多区无裂隙凝析油藏注水凝胶系统现场参数试验研究

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Excess water production during gas production causes serious operational problems and, may shutoff the wells. Polymer gel is one of the water shutoff (WSO) methods extensively used in mature gas fields in the recent years. In this research, Cr (III)-acetate sulfonated polyacrylamide hydrogels were applied in porous media with radial flow. In order to obtain gel treatment conditions with desirable performance, some sandpack-flooding tests were designed. By statistical design of the experiments using central composite, the sandpack-flooding tests were conducted to investigate the effect of gel penetrated area and reservoir porosity on the WSO efficiency. The results showed that lower gel penetrated depth led to lower gas-condensate permeability reduction and, the utmost reduction of water permeability was in a critical depth of gel penetration. In optimum conditions, a gel penetration of 0.96 cm and a porosity of 31.46% had RRFg (gas-condensate residual resistance factor) of 1.83 and RRFW (water residual resistance factor) of 5510, respectively. Some tests through multi-zone sandpacks were carried out to examine the effect of layers with different porosities and crossflow presence. Multi-zone sandpacks with crossflow between the gas-condensate and water-producing zones showed RRFW in a range of 28.2-244.7. However, the selectivity increased from 90 to 99.9% without crossflow. It was found that the chance of successful WSO treatment increases when the higher permeable layers are over the lower permeable layers. (C) 2015 Elsevier B.V. All rights reserved.
机译：天然气生产过程中过多的水生产会导致严重的操作问题，并可能关闭油井。聚合物凝胶是近年来在成熟气田中广泛使用的一种关水（WSO）方法之一。在这项研究中，醋酸铬（III）磺化聚丙烯酰胺水凝胶被应用于径向流动的多孔介质中。为了获得具有期望性能的凝胶处理条件，设计了一些沙包注水测试。通过使用中心复合材料进行实验的统计设计，进行了沙堆注水测试，以研究凝胶渗透面积和储层孔隙度对WSO效率的影响。结果表明，较低的凝胶渗透深度导致较低的凝析气渗透率降低，最大的水渗透率降低是在凝胶渗透的临界深度。在最佳条件下，凝胶渗透率为0.96 cm，孔隙率为31.46％，RRFg（气体冷凝物残留阻力系数）为1.83，RRFW（水残留阻力系数）为5510。通过多区域沙堆进行了一些测试，以检验具有不同孔隙率和错流存在的地层的影响。产气带和产水带之间有横流的多区沙堆的RRFW范围为28.2-244.7。但是，没有错流，选择性从90％增加到99.9％。发现当较高的可渗透层在较低的可渗透层上方时，成功进行WSO的机会增加。 （C）2015 Elsevier B.V.保留所有权利。

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