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ANALISA ADSORPSI, WETTABILITY, DAN CORE FLOODING RECOVERY PADA INJEKSI SURFAKTAN NATRIUM LIGNOSULFONAT BERBAHAN BAKU AMPAS TEBU PADA BATUAN PASIR TERHADAP HASIL EKSPERIMEN DAN SIMULASI

Undergraduate Theses from JBPTITBPP / 2017-09-27 15:07:48
Oleh : ANTONI BUDHI PRASETYO , S2 - Petroleum Engineering
Dibuat : 2017-09-22, dengan 1 file

Keyword : Surfactant flooding, adsorpsi, wettability, surfaktan lignosulfonat, simulasi reservoir

Surfactant flooding merupakan salah satu metode dalam enhanced oil recovery (EOR). Pada penelitian ini digunakan surfaktan berbahan baku ampas tebu, yaitu surfaktan natrium lignosulfonat atau SLS, sebagai surfaktan alternatif untuk aplikasi EOR. Surfaktan yang digunakan pada proses EOR perlu dianalisis kemampuannya dalam meningkatkan perolehan minyak, seperti uji adsorpsi dan wettability. Tujuan penelitian ini adalah menganalisis pengaruh variasi salinitas dan konsentrasi surfaktan pada uji adsorpsi dan wettability, serta mendapatkan total recovery factor surfactant flooding melalui simulasi.



Pada uji adsorpsi dan wettability dilakukan variasi salinitas 5000 - 80000 ppm dan variasi konsentrasi surfaktan dari 1% - 5%. Simulasi surfactant flooding dilakukan menggunakan software CMG STARS dengan matching model berdasarkan data eksperimen sebelumnya, lalu dilakukan forecasting nilai total recovery factor.



Berdasarkan hasil pengamatan, salinitas dan konsentrasi mempengaruhi nilai adsorpsi dan wettability. Nilai adsorpsi meningkat seiring dengan peningkatan konsentrasi. Hal ini disebabkan semakin tinggi konsentrasi surfaktan semakin banyak surfaktan yang menempel pada batuan. Pada salinitas rendah, nilai adsorpsi tinggi. Hal ini dikarenakan ion garam dapat mengurangi repulsion forces antara surfaktan dan batuan. Sebaliknya pada salinitas tinggi, nilai adsorpsi rendah dikarenakan ion garam berinteraksi dengan air (salt out) sehingga repulsion forces antara surfaktan dan batuan meningkat. Nilai adsorpsi terendah sebesar 459.30 mg/mL pada konsentrasi surfaktan 1.5% dan salinitas 5000 ppm.. Pada uji wettability, peningkatan konsentrasi surfaktan menurunkan sudut kontak antara air dan batuan. Hal ini disebabkan surfaktan dalam larutan dapat meningkatkan gaya adhesi air. Pada kondisi salinitas rendah sudut kontak kecil, hal ini disebabkan ion garam dapat mengurangi repulsion forces antara surfaktan dan batuan, sehingga gaya adhesi air masih lebih besar dari gaya kohesinya, sedangkan pada salinitas tinggi ion garam berinteraksi dengan air sehingga gaya kohesi air lebih besar daripada gaya adhesinya. Hal ini menyebabkan pada kondisi salinitas tinggi sudut kontak besar. Nilai sudut kontak terkecil sebesar 18.430 pada konsentrasi surfaktan 5% dan salinitas 10000 ppm. Simulasi surfactant flooding menghasilkan total recovery factor tertinggi sebesar 34.32% pada salinitas 10000 ppm dan konsentrasi surfaktan 3%, sedangkan pada salinitas 20000 ppm total recovery factor tertinggi sebesar 28.67% pada konsentrasi surfaktan 4%.

Deskripsi Alternatif :

Surfactant flooding is one of enhanced oil recovery or EOR methods. This research used surfactant sodium lignosulfonate or SLS which is synthesized from bagasse, as an alternative surfactant for EOR applications. Surfactant used in EOR process needs to be analyzed interms of its ability in increasing recovery factor such as using adsorption and wettability test. The purpose of this research is to analyze the effect of salinity and surfactant concentration variation on adsorption and wettability, and to obtain total recovery factor using surfactant flooding simulation method.



For adsorption and wettability test, we used different concentrations of salt (5000-80000 ppm) and different surfactant concentrations (1% - 5%). Surfactant flooding simulation was done by matching model to the previous experiment result and forecasting the total recovery factor value using CMG STARS software.



Based on the results, salinity and surfactant concentration affect the adsorption and wettability of surfactant. Adsorption value increase with the increase of surfactant concentration. This is due to the increment of surfactant concentration will increase number of surfactant attached to the rock. At low salinity, the adsorption value increases with the increase of salinity due to ion salt reduce repulsion forces between surfactants and rock. At high salinity, the adsorption value slightly decrease due to the interaction between water and ion salt (salt out) which increase repulsion forces between the surfactant and the rock. The lowest adsorption value is 459.30 mg/mL at salinity 5000 ppm and surfactant concentration 1.5%. In wettability test, contact angle between water and solid decrease with the increase of surfactant concentration. This is due to ion salt reduce repulsion forces between surfactants and rock, thus surfactant can increase adhesion forces of water. At low salinity contact angle is low. This is due to ion salt interact with surfactant, thus, adhesion forces of water still larger than cohesion forces. On the otherhand, At high salinity contact angle is high, due to ion salt interact with water, thus, cohesion forces of water is larger than adhesion forces. The lowest contact angle value is 18.430 at salinity 10000 ppm and 5% surfactant concentration. Surfactant flooding simulation shows that highest total recovery factor is 34.32% has reached at salinity 10000 ppm and surfactant concentration of 3%. Meanwhile, highest total recovery factor is 28.67% at salinity 20000 ppm and surfactant concentration of 4%.

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  • (Prof. Dr. Ir. Hasian P. Septoratno Siregar, DEA, Editor: Irwan Sofiyan

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