Uji Sensitivitas Cyclic Water Injection Pada Reservoir Sandstone Di Lapangan Volve Menggunakan Simulasi Reservoir

Baihaqi, Bafadhal (2022) Uji Sensitivitas Cyclic Water Injection Pada Reservoir Sandstone Di Lapangan Volve Menggunakan Simulasi Reservoir. Other thesis, Universitas Islam Riau.

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Abstract

Petroleum production is carried out in stages with the primary method then if this method is no longer effective then water injection is carried out. The water injection method is divided into several types, namely continuous water injection, water alternating gas and cyclic water injection (CWI). The Volve field has a drive mechanism in the form of a solution gas drive and to maintain reservoir pressure, Continues water injection is carried out, but Continues water injection has several drawbacks such as very fast water breakthrough, causing a high rate of increase in water production. Based on this, to minimize the production rate water during the oil production period can be done using the CWI method. CWI causes reservoir pressure to be directly proportional to the injection flow rate. Water will flow from high permeability to low permeability, this is known as pressurizing. On the other hand, depressurizing is the injection of water that is stopped or the flow rate of the injection is reduced for a certain period of time. During the depressurizing period, there is a change in oil flow, where the oil will flow from the low permeability layer to the high permeability layer, so that the oil will be swept into the production wells during the next half pressurizing cycle. The scenario of this research is to inject shut-in and shut-off water with a ratio of 1:1.1:2,2:1 and 1:3 on a day scale with an injection rate of 25159 bbl/day, 37738 bbl/day and 50318 bbl/day with a well space of 1000 ft, 1500 ft and 2000 ft. With the sensitivity carried out on some of these parameters, it can be seen the performance of CWI to increase the recovery factor in the Volve field. In the scenario of 1 day injection and 3 days without injection, the highest cumulative oil production is obtained compared to other scenarios of 34.46 MMbbl at an injection rate of 4000 m3/day. The pressurizing and depressurizing processes in this scenario are able to increase sweep efficiency and overcome water breakthroughs in the base case at all tested well distances. The greater the distance between the injection and production wells, the wider the injection sweep area with respect to oil saturation.

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