Postmortem Analysis: Lick Creek Meakin Sand Unit Immiscible CO2 Waterflood Project
1992; Linguagem: Inglês
10.2523/24933-ms
Autores Tópico(s)Geological Modeling and Analysis
ResumoSPE MembersAbstract. This paper gives a post mortem analysis of the Lick Creek Meakin Sand Unit (LCMSU) immiscible CO2 waterflood project. The project was initiated in 1976 to increase oil recovery from the thin, heavy oil sand. A reservoir simulation study run prior to the project indicated an immiscible CO2 waterflood would recover twice as much oil as a conventional waterflood (oil recovery of 16 percent OOIP for an immiscible CO2 waterflood versus 8 percent OOIP for a conventional waterflood). The project was scheduled to be developed in four stages:cycle all wells with CO2,continuous CO2 injection into the unit injection wells,alternate CO2 and water injection in the injection wells, andwater injection only into the injection wells; however, CO2 and water injection in the unit ended prematurely due to the precipitous drop in oil prices in 1986.Channeling of the injected CO2 and water in the immiscible CO2 waterflood project has been a major area of concern. During the course of CO2 injection, a foam treatment and 15 gelled polymer treatments were applied in the unit to increase diversion of the injected fluids and improve sweep efficiency.Incremental oil recovery from the project, over that of primary recovery, has been estimated to be 1.75 MM STB [0.278 MM m3] of oil to October 1, 1990 (11.1 percent OOIP), compared to an initial projection of 16 percent OOIP incremental oil recovery. The lower than projected oil recovery was due to channeling of the injected CO2 and water in the reservoir and also due to the premature termination of the project due to low oil prices. The results of the 15 gelled polymer treatments conducted to reduce channeling have been favorable overall with incremental oil recovery from the gelled polymer treatments estimated to be 114,700 STB [18,240 m3] from a total of 76,800 active pounds [34,850 kg] of polymer injected or 1.49 STB of oil recovered per pound [0.52 m3/kg] of polymer injected. The use of tracers in identifying high permeability channels was instrumental in the success of these treatments.Introduction. The Lick Creek Meakin Sand Unit (LCMSU) was an immiscible carbon dioxide waterflood project operated by Phillips in Bradley and Union Counties, Arkansas.P. 813^
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