TABALONG – The full implementation of Enhanced oil Recovery (EOR) methods in the Tanjung field is expected to increase oil and gas production fourfold. This is the expectation of the Deputy Minister of EMR, Mr. Susilo Siswoutomo while conducting work visit to the Tanjung Field in Tabalong, South Kalimantan, Saturday (26/7/2013).
“After the 12 months EOR pilot project in Tanjung Field is completed, we expect to have an increase of oil production up to three or fourfold from the current production,” said the Deputy Minister.
In supporting the EOR program, Pertamina EP will make 48 to 50 injection well and from the 134 production well, we are expecting production increase up to 18.000 barrel per day in 2016, Mr. Susilo continued.
Mr. Susilo also added, the implemented EOR process will not affect the environment because the injected substance is not of dangerous materials. “There is no adverse impact on the environment because the injected substances are salt, soda and surfactant made by the Bogor Institute of Agriculture (IPB). All of which have met the safe environment criteria, so there will be no dangerous substances flowing to the trenches”, said Susilo.
Regarding the level of success of the EOR projects, Susilo said that it depends on the indications shown by the injected well, right now it has been injected for eight months, and the result based on three monitored well from 300 meters injected have shown an increase of oil production.
The EOR technology is an advanced method for oil depletion to optimize the production of an oil field. EOR is the key to increase the national oil production but because of the high cost of implementing EOR, not many fields are using this method.
The enhancement of oil production through EOR is stated in the Ministerial Decree No. 06 Year 2010 on The Enhancement of Oil and Gas Production and the Presidential Instruction No. 2 Year 2012. It is stated in the Ministerial Decree No. 6 Year 2010 that oil and gas contractors must revitalize non productive fields, one of which is through the EOR technology. Therefore, we need to inventory potential non productive oil fields.
The mandatory of EOR studies have also been incorporated in the production sharing contracts (PSC). The government have also encouraged the involvement of research and development agencies and universities in the research for types of injection fluids, microbials, CO2 and nitrogen.
There are three techniques of EOR implementation, first, the thermal technique by injecting high temperature fluid into the formation to decrease the viscosity of the crude oil so that it will be easier to be extracted.
Second, the chemical technique by injecting chemical substances in the form of surfactants, the result is the oil is going to be easier to flow. And the third is the miscible process by injecting driving fluids that will be mixed with the crude oil and then easy to be produced.
The EOR project contract for Tanjung Field was signed in 1989, continued by a pilot project in 1990 dan fully operated in 1995. At that time, they injected into the well 100.000 barrel of fresh water per day, and resulted in producing 10.000 barrel oil per day. Now, Pertamina EP will start to implement the EOR project in the Tanjung Field with chemical injection into one of the wells as a pilot project. (AJ)