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EOR (Enhanced Oil Recovery) September 15, 2010

Posted by ugmsc in Course and Workshop.
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Introduction

Oil production in Indonesia has declined from year to year. Data in 1995 shown Indonesian oil production is about 1.434 million barrels per day, but in 2007 only about 1 million barrels per day. Oil production (crude oil) in Indonesia, which is mostly derived from brown wells (old wells), naturally decline from year to year as much as 15% of total production. But with the various methods in an attempt to optimize the fields such as Enhanced Oil Recovery, the decline can be reduced to the level 6.7% per year.

Enhanced Oil Recovery (EOR) is methods attempt to improve the extraction of crude oil by injecting different kinds of materials that can change selected properties of physics and chemistry of fluid (water and oil) in the reservoir rocks.

Oil Production Recovery

There are three kind of oil production recovery to get maximum product in oil exploration.

  1. Primary recovery

Oil production only uses the existing power in the reservoir (natural water movement, gas expansion cork, the movement of dissolved gases, and changes in pressure)

  1. Secondary recovery

Oil production by providing gas or water injection to push the oil out, the basic concept is to keep the pressure of the reservoir same as in primary recovery.

  1. Tertiary recovery

Any process that can take oil from the reservoir with a better job than conventional technologies (primary and secondary recovery), and generally use the fluids more effective, and is called the recovery agent.

Factors leading to the availability of oil is broadly because the reservoir rock’s heterogeneity. Only a part of the reservoir which can be contacted or swept by the fluid pressure, whereas some others passed, was exposed and swept away. And in the reservoir can be contacted by fluid pressure, not all oil can be washed away, in part, between 10% – 40% of pore volume remained stuck in the pores due to capillary pressure (Pc) and the interface tension (IFT) is too large. And the last oil viscosity is too large, also can hinder the flow rate to be produced economically.

Pict 1. EOR System

EOR classification

According to Pinczewski (1993) and Ershagi (1994), the processes in the EOR can be classified into 3 major categories. Respectively – these methods have their own characteristics – themselves mainly related to the type of oil remaining to be taken and reservoir characteristics (rock where the oil is)

  1. Chemical: 1) Surfactant flooding, 2) Micellar Polymer Flooding, 3) Polymer Flooding, dan 4) Alkaline atau Caustic Flooding.
  2. Thermal: 1) Steam Flooding dan 2) Fire Flooding
  3. Miscible: 1) Carbon Dioxides Flooding, 2) Nitrogen and Flue Gas Flooding, dan 3) Enriched Hydrocarbon Gas Flooding

Pict 2. Oil Recovery Mechanism

Things that need to be consider in the EOR process

  1. Physical properties
  2. Reservoar
  3. Structure and physical properties porous media
  4. Fluid condition in porous media
  5. Mobilization of oil remaining
  6. Adsorption process

Experimental data obtained from increasing more than 60% of the remaining existing oil can be taken back to using the SLS and HPAM with concentrations between 500 to 20,000 ppm depending on the type of oil, rock porosity and permeability, reservoir temperature and pressure and rock type. If these conditions can be applied in the field – oil field in Indonesia, the Indonesian oil production could be increased between 20 – 60%, so the oil can be expected to be drawn would last about 80 years.

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This article was from AAPG UGM SC Yogyakarta Regional Workshop “EOR (Enhanced Oli Recovery), Methods, Application and Contribution to The Petroleum and Gas Industry For Today and Future”

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Yogyakarta February 9th 2010, Lectured by

  1. Prof. Ir. Suryo Purwono, M.Sc, Ph.D. (UGM)
  2. Dr. Bob Wikan (Pertamina EP)
  3. Dr. I Putu Suarsana (Pertamina EP)
  4. Grace Stephani Titaley (Pertamina EP)

Cheerss.. :)

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