The Dual Solvent Slug Technique for Improving the Injectivity of Waterfloods
- J.A. Relf (Chemcell Ltd.) | J.R. Sears (Home Oil Company Ltd.)
- Document ID
- Petroleum Society of Canada
- Journal of Canadian Petroleum Technology
- Publication Date
- September 1964
- Document Type
- Journal Paper
- 118 - 123
- 1964. Petroleum Society of Canada
- 5.3.4 Reduction of Residual Oil Saturation, 5.3.2 Multiphase Flow, 6.5.2 Water use, produced water discharge and disposal, 4.3.3 Aspaltenes, 4.1.2 Separation and Treating, 5.4.1 Waterflooding, 5.2.1 Phase Behavior and PVT Measurements, 5.4.7 Chemical Flooding Methods (e.g., Polymer, Solvent, Nitrogen, Immiscible CO2, Surfactant, Vapex), 6.5.3 Waste Management, 1.2.3 Rock properties, 4.6 Natural Gas
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In recent years, secondary recovery of oil by water flooding has becomeincreasingly popular in Western Canada. In most cases, water injection wellsare completed by converting wells that were formerly used for oil production;common practice is to place these wells on injection after some form oftreatment to remove wax and other deposits from the well bore.
It has been known for some time that the presence of residual oil impedesthe flow of water, and this is particularly significant in the area immediatelysurrounding the well bore. It has also been demonstrated in the past that theuse of a miscible displacing fluid leaves lower residual oil saturations thatdoes the use of an immiscible displacing medium such as water. There have beenseveral methods proposed to achieve a reduction in residual oil saturationaround water injection wells. These have mainly dealt with the use ofsurfactants or the injection of low-viscosity hydrocarbon solvents.
Recently, several articles have appeared in the literature concerningincreased recovery of crude oil from formations through the use of largesolvent slugs that are mutually miscible with oil and Water. These articles,based on laboratory studies on a variety of solvents, indicate that this methodof recovery is technically feasible but does not appear to be economical.
This paper covers an adaptation of the miscible solvent slug technique toincreasing injectivity of conventional waterfloods by a reduction of theresidual oil saturation around the well bore. Reduction is accomplished byinjecting an oil-soluble solvent slug followed by a mutually misciblewater-soluble solvent slug. Two alternate types of treatment are discussed, onefor newly converted injection wells and the other for wells that have beenperforming poorly on water injection. The theory behind these treatments isdiscussed as well as actual case histories of successful field trials onseveral Alberta wells.
Several articles have been written recently on the subject of secondaryrecovery by waterflooding in Western Canada. It has been stated that knownrecoverable oil reserves will increase by approximately 50 per cent when allsecondary recovery projects now in operation or planned are completed.
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