<em>In this research, bagasse NaLS surfactant was used as an injecting reservoir fluid at low salinity. The purpose of this study was to observe the effect of IFT and thermal stability on oil recovery factors in various compositions. The material used in this study isbagasse based NaLS surfactant, light oil and sandstone, while spinning drop is used to measure the interface tension. The oven was used for thermal stability testing and core flooding equipment for the surfactant injection. The success in this study was based on the value of the recovery factor, the small IFT value, and stability of IFT in the thermal stability test. The IFT results obtained for CF1, CF5,and CF7 were 10.4 mN / m, 4.09 mN / m, and 4.34 mN / m, respectively. Based on The results of the thermal stability test only the CF7 was stable with an IFT value of 2.11 mN / m, while the other two variations were unstable. The recover factor of CF1, CF5, and CF7 was 3.24%, 3.52%, and 5.34%, respectively. It can be concluded that IFT as well as thermal stability affect the frecovery factor.</em>
Enhanced Oil Recovery (EOR) is an effort to increase oil recovery after primary recovery and secondary recovery. One method used is chemical injection using surfactants. Sodium Lignosulfonate (SLS) is one of the anionic surfactants commonly used in the EOR process. Sodium Lignosulfonate can be made by bagasse synthesis, as an alternative to the use of lignosulfonate surfactant. The purpose of this study was to determine the effect of the middle phase emulsion and interfacial tension on the recovery factor results. The method used is the core injection. The injection fluid used is Sodium Lignosulfonate surfactant which has been tested for its characteristics. This research uses core flood devices and synthesized Berea cores. Core injection is carried out in several variations of salinity and surfactant concentration. The results of the study show that the largest recovery result is at 1.5% 15000 ppm with a recovery factor of 5.34% where the emulsions are the least among other compositions but the emulsions are stable at 48 hours and the IFT value is also relatively low at 4.34 mN/m. The lowest recovery results are at 1.5% 4000 ppm with a recovery factor of 3.24% where the emulsions are highest but the emulsions are stable at 336 hours, and the IFT value is relatively high at 10.40 mN / m. Based on this study it can be concluded that if the middle phase emulsion is quickly stable and the IFT value is low it will result in enhanced oil recovery.
Indonesia is one of the largest sugarcane producing countries in the world. At present, the use of bagasse is only as compost, electricity generation, etc. In the oil industry, bagasse can use as a base material in making surfactants that function as fluid reservoir oil injection to improve oil recovery factors, so it is good to develop a type of plant-based local surfactant with a lot of raw materials in Indonesia. The purpose of this study was to see that bagasse can increase the oil recovery factor at low salinity. The methods used is a laboratory study using a concentration of 1%; 1.5%; 2%; 2.5% and 3% NaLS and salinity of 4000 ppm, 5000 ppm, and 15000 ppm NaCl. The Surfactant first conducted a compatibility test then core flooding was carried out to obtain the recovery factor value. The results obtained were surfactants with variations of 1.5% 4000 ppm; 1.0% 15000 ppm; and 1.5% 15000 ppm which passes the compatibility test with the recovery factor value sequentially is 3.24%; 3.62%; and 5.34%. It shows that NaLS surfactant can increase the oil recovery factor at low salinity by 5.34% by optimizing 1.5% NaLS 15000 ppm concentration.
Salah satu metode dalam Enhanced Oil Recovery adalah Chemicalflooding. Pada penelitian laboratorium ini dilakukan injeksi larutan surfaktan berbahan dasar AOS pada batuan sandstone dengan konsentrasi 05%, 1%, dan 2% dalam masing-masing salinitas 5.000 ppm dan 10.000 ppm. Hal ini bertujuan untuk mengetahui pengaruh kenaikan konsentrasi pada surfaktan terhadap perolehan minyak. Sebelum dilakukan tahapan injeksi, terlebih dahulu dilakukan uji fisik larutan surfaktan, sehingga dapat ditentukan larutan yang akan diinjeksikan ke dalam batuan. Dari proses uji fisik didapati bahwa semakin tinggi konsentrasi larutan makan nilai dari densitas, viskositas, dan spesific gravity akan turut meningkat. Dalam prakteknya, larutan surfaktan akan menurunkan nilai tegangan antarmuka (IFT) sehingga dapat meningkatkan perolehan minyak yang tersisa dalam pori-pori batuan. Nilai IFT terendah adalah pada surfaktan dengan konsentrasi 2%, sedangkan yang tertinggi surfaktan dengan konsentrasi 0,5%. Pengaruh kenaikan konsentrasi surfaktan terbukti lebih optimal, memiliki nilai recovery factor sebesar 43,89% dengan konsentrasi 2% salinitas 10.000 ppm.
Reservoir ZX merupakan reservoir gas basah ( wet gas reservoir ) yang diketahui jenisn reservoirnya melalui metode kualitatif dengan analisa komposisi hidrokarbon reservoir, karakteristik fluida reservoir dan data PVT. Pada penelitian yang dilakukan, analisa komposisi hidrokarbon mulai dari karbon C1 hingga C7+, data karakteristik fluida reservoir yaitu GLR, API, dan SG gas. Karena reservoir ZX adalah reservoir gas basah ( wet gas reservoir ), dilakukan pengkoreksian kumulatif dari gas yang diproduksi dari Gpdry menjadi Gpwet dengan metode vapor equivalent dengan nilai Veq didapatkan sebesar 1690. Dalam penelitian, penentuan jenis tenaga dorong dari reservoir ZX menggunakan metode energy plot dan P/Z Vs Gp. Hasil metode energy plot tidak terdapat water influx yang menandakan jenis tenaga dorong pada reservoir gas adalah depletion gas drive dan sesuai dengan analisa pada garis plot metode P/Z Vs Gp yang menandakan jenis tenaga dorong depletion gas drive. Perhitungan isi awal gas di tempat pada penelitian digunakan metode volumetrik, Material Balance 3113,135 BSCF dan memiliki nilai recovery factor dari metode Material Balance adalah 80,523%.
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