CO2 Injection By Huff & Puff At Jatibarang Field

Abstrak

CO2 EOR is one of EOR methods that proven in the world but a full-scale CO2 EOR needs huge investment and must be prepared very carefully. Thus, for the first step of CO2 EOR, Pertamina EP proposed to inject a small volume of CO2 by using Huff & Puff method. Huff & Puff consist of three steps, (1) CO2 injected down to production well or "Huff” stage, (2) soaking stage, and (3) produce the well or "Puff" stage.
Jatibarang Field is chosen to apply Huff-n-Puff CO2 injection due to its oil characteristic and having CO2 source nearby. Jatibarang oil field is located about 30 KM southwest of Cirebon city within the Pertamina EP concession area, discovered in November 1969. Field Jatibarang Layer F began to be produced in March 1975. The F layer consists of carbonate rock and shale which deposited in continental shelf platform or reefal environment, and the thickness of the reservoir is 4-5 m. Jatibarang reservoir has API 36, 0.5-0.9 cP of viscosities, 10.87- 21.38% of porosities, 3727-3937 feet of reservoir depth and permeabilities ranging from 40 to 60 mD. With these reservoir properties, the EOR screening shows that CO2 EOR was suited to be applied in Jatibarang. Pertamina EP will conduct 3 (three) CO2 Huff & Puff in Jatibarang field which planned to be implemented in Q4 2018.
This paper presents overview of EOR Field experiences in worldwide using CO2 Injection Huff & Puff. Brief study to screen well candidates for Huff & Puff and identify viable practice surveillance basis of past EOR experiences.