Pengujian Return Permeability Untuk Penginjeksian Air Kembali Pada Reservoir Selama Masa Produksi

Setiawan, Yovi Veron (2021) Pengujian Return Permeability Untuk Penginjeksian Air Kembali Pada Reservoir Selama Masa Produksi. Other thesis, Universitas Islam Riau.

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Abstract

If too much formation water has been produced to the surface, one of the efforts used is to re-inject the water into the reservoir. In addition to treating the environment, water injection can also be useful for reservoir pressure maintenance so that the production period can run longer. Before injecting water into the reservoir, there are things that need to be considered, namely the characteristics of the rock and the compatibility of the injection water against the rock so that the water injection process is successful and does not cause problems in rock formation. This identification can be done by using a return permeability test involving the core and the injection fluid. This test is classified as a dynamic test, where the core sample is tested with injection water flow, and the permeability changes that occur in the core will be observed. The injection water used has 2 salinity variations which will be used as a comparison. Given the presence of clay minerals that will meet with water, in general this has an effect on changes in permeability. Even so, it still has to be tested, given the variation in rock mineral content and water salinity in various parts of the world. The test results obtained show that the permeability will always decrease over the time of injection due to the clay minerals present in the rock. Therefore, this can be handled by adding salinity to the injection water so that the clay does not become too reactive. Of the two variations in the salinity of injection water used, injection using a higher salinity water can slow down the decrease in the effective permeability of oil by even 2.5%. In contrast to the injection using low salinity water which causes a decrease in the effective permeability of oil which is higher, namely 8.5%.

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