Analisis Efek Kandungan Brine Ca2+ Dan Mg2+ Terhadap Mekanisme Low Salinity Water Injection Pada Batuan Sandstone Menggunakan Metode Spontaneous Imbibition Test

Cahyadi, Ihsan (2021) Analisis Efek Kandungan Brine Ca2+ Dan Mg2+ Terhadap Mekanisme Low Salinity Water Injection Pada Batuan Sandstone Menggunakan Metode Spontaneous Imbibition Test. Other thesis, Universitas Islam Riau.

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Abstract

After a long period of production, the average oil well fields in Indonesia are classified as old wells which are generally no longer able to produce in the primary and secondary recovery stages, although there are still many remaining oil reserves contained therein. Therefore, it is necessary to process oil production at the tertiary recovery stage using the EOR method. One of the proposed EOR methods can increase oil production and can be economical, namely Low Salinity Water Injection or also known as Low Salinity Waterflooding (LSW). One of the testing processes in the laboratory to determine the effect of this LSW method on oil recovery is using the spontaneous imbibition test. The mechanism in this spontaneous imbibition test is the occurrence of a process of pressing oil (non-wetting fluid) which is replaced by brine (wetting fluid) in porous rock media by utilizing capillary pressure. The test was carried out on samples of sandstone and wax crude oil in two stages, namely the SI1 (secondary recovery) and SI2 (tertiary recovery) stages. The brine used in the SI1 stage was only 10,000 PPM of NaCl during the first 12 hours, while for the SI2 stage the variation of each salinity was 500 PPM, 5,000 PPM, and 10,000 PPM for each type of brine NaCl, MgCl2, and CaCl2 during next 12 hours at 70°C. Based on the results of spontaneous imbibition testing, it was found that the difference in the value of oil recovery from the SI2 stage to the SI1 stage was the most significant in the use of brine NaCl 500 PPM, which was 22.22%. The next result obtained is a decrease in the percentage increase in oil recovery along with an increase in the salinity of the brine used and the type of brine from NaCl, MgCl2, then CaCl2. In addition, changes in the pH value of brine before and after the test did not show any significant change in the percentage increase in oil recovery. Thus, the use of brine with lower salinity or low salinity in this spontaneous imbibition test shows better results of increasing oil recovery so that it can be used as one of the parameters for consideration in testing the next LSW method.

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