ONGC Places India on World Map of Heavy Oil Polymer Flooding PSU NEWS

ONGC Places India on World Map of Heavy Oil Polymer Flooding

 

New Delhi: Significant oil recovery has been obtained by a pilot in ONGC Becharji heavy oil field in North Gujarat, which was first put on production in July 1988. ONGC is going to commercialize this on a field scale. Only a few countries worldwide employ this heavy oil polymer flooding like Marmul, Nimr of Oman, Pelican Lake of Canada, Tambaredjo field of Suriname, Bentley offshore UK, etc. ONGC takes a lot of pride in accomplishing this marvelous milestone with the combined efforts of its diligent work force.

 
The Bechraji heavy oil field of Mehsana Asset was discovered in September in the year 1987 and put on commercial production in July 1988. As per the data on 1 April 2018, the proved OIIP and ultimate reserve of the field are 32.96 MMt and 6.76 MMt (20 % of OIIP) respectively. The viscosity of crude oil is around 270 cP at the reservoir conditions and oil API gravity is 15.6o. The viscous nature of oil causes adverse mobility ratio and results in early water breakthrough due to viscous fingering. A sharp rise in water cut (~ 80 %) is observed in the early phases of production. As on 1 April 2018, the cumulative oil production of the field is 3.81 MMt, which is 11.5% of OIIP.The low primary recovery is due to early fingering of water caused by adverse mobility ratio. This necessitated application of enhanced oil recovery (EOR) techniques to increase recovery.
 
In view of the limited success of in-situ combustion process, the efficacies of chemical EOR in Bechraji field was studied at IRS, Ahmedabad. The Laboratory studies and Simulation studies showed encouraging results and significant improvement in oil recovery with Polymer flooding. Accordingly, a pilot area was selected at the southern part of the field in a structurally high area. Pilot is to be carried out with single five-spot patterns, four injectors and one oil producer. To address the OIIP of 0.033 MMm3 in the selected pilot five-spot pattern, one new oil producer (BC#222), three new injectors (BC#220,221,223) and conversion of one existing oil producer (BC#106) were considered. The primary objective of this project is to test the efficacy of Polymer flooding process in Bechraji field to commercialize the scheme at field scale and gain operational insight.


Posted Date :  25-05-19

Categories : PSU NEWS

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