Field Performance Evaluation of Crosslinked Polymers to Increase Oil Recovery in The Wilmington Field, California

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Abstract
In the Wilmington Field, direct channeling of injection water from injector to producer has adversely affected oil recovery. The solution to this problem may be approached from two directions. The first is to seal off the channel at the injector. The second approach is to treat the affected producing wells. This approach has many advantages which will be explored in this discussion. Both methods have been used in portions of the Wilmington Field. This paper will examine new technology in crosslinking poly acrylamides to control water permeability in unconsolidated sands. Field data will be presented on treatment procedures, problems encountered and solutions for incurred problems. Conclusions are:New in situ polymer gelling techniques provide an effective control over subsurface water movement.By excluding water production in the Wilmington Field, effective sand control has been achieved.Control of water entries in the producing wells can affect the sweep efficiency in the flood pattern. Introduction: The Wilmington Field is located in the south central Los Angeles Basin between the Torrance and Huntington Beach oil fields. The Wilmington structure is a northeast, southwest trending asymmetrical anticline, which is transversed by numerous faults dividing the structure into nine major fault blocks. In the crestal area, there are seven major producing intervals of Lower Pliocene and Upper Miocene Age between 2200 feet and 5600 feet in depth. Each producing zone is composed of numerous individual sand members which vary from poorly-sorted, coarse-grained, unconsolidated sand in the upper zones to more consolidated sands, interbedded with shales and siltstones in the lower zones.

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