Abstract
Masjed-I-Suleyman (MIS) field is the first field in the Middle East that has produced oil and has such a long production history (100 years). This field’s production started in 1911. Most of the oil production in the Middle East come from carbonate reservoirs, the majority of which are fractures. These reservoirs tend to produce at high rates in their early production period followed by low rates later on, leading to low overall recovery. The early production rate of this field was 120,000 stb/day, now reaching about 2,000 stb/day. MIS field has produced 1.39 billion stb of oil as of 1 January 2010, which makes it a giant field by world standards. 267 million of this produced oil was re-injected into the reservoir and if the recycled oil re-injected into the reservoir is included, the net total oil produced as of 1 January 2010 would be 1.123 billion stb. Based on original oil-in-place of 6 billion stb, the recovery factor equates to 23.2 % (based on the gross oil production) or 18.7 % (based on the net oil production). So this reservoir is a candidate for an EOR process. It seems the gas injection into oil reservoirs is one of the most effective methods in EOR approaches (Ganji and Haghighi 2006). In this study, the injection technique that was used includes gas injection with different fluids that causes an immiscible process. A compositional reservoir simulator has been used to determine the effect of the gas injection process on reservoir production to optimize the oil recovery for the MIS field. Simulation results show that gas injection is not useful for this field.
Highlights
The Masjed-I-Suleyman (MIS) field is a large onshore production field located in Southwest of Iran (Fig. 1) and began production in 1911
A compositional reservoir simulator has been used to determine the effect of the gas injection process on reservoir production to optimize the oil recovery for the MIS field
Simulation results show that gas injection is not useful for this field
Summary
The Masjed-I-Suleyman (MIS) field is a large onshore production field located in Southwest of Iran (Fig. 1) and began production in 1911. The goal of this study is an investigation of several production strategies to optimize the recovery of MIS field. Zone 6 is very tight and can be ignored in the volumetric oil-in-place calculation (Speers 1975). Of all the wells drilled, only 22 wells were logged. Of the 22 logs, only 5 logs reach zone 6 and only 2 are modern logs. This results in uncertainties in some of the key reservoir parameters (e.g., net pay, porosity, initial water saturation) especially for the lower zones. There were only two routine core analyses and only one of them covers all zones. Based on the cumulative oil production and oil-inplace, the entire field may be subdivided into six The one by (Paravar 2000) yields original oil-in-place of 7 billion stb and the other one by (ECL 2002) yields original oil-in-place of 6 billion stb
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