E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 33/138 (2006.01) C09K 8/512 (2006.01) C09K 8/88 (2006.01) E21B 43/25 (2006.01)
Patent
CA 2086599
The present invention is a process for selectively plugging high permeability zones of a subterranean hydrocarbon-bearing formation by enhancing the delay associated with the in situ formation of a polymer gel. The process comprises predetermining a gelation delay time based on a formation's temperature, permeability and porosity, the distance from the well bore a region to be plugged is located, and a volumetric rate of gelation fluid injection. A gelation solution is then prepared comprising polyacryla- mide a polyvalent metal carboxylate crosslinking agent, a gelation delaying agent and a buffer with a pKa of about 3.5 to about 6.8. Gelation delays are achieved by selecting the polyacrylamide concentration, delaying agent concentration and type, and buf- fer concentration and type, for given formation conditions. Delay times can range from several hours to several weeks at forma- tion temperature near 176 °F (80 °C) and from several hours to about one day at formation temperature above about 219 °F (104 °C). The prepared solution is then injected into the formation via a well bore and allowed to gel. The gel selectively plugs high permeability zones within a subterranean hydrocarbon-bearing formation, at temperatures and distances from the well for- merly unobtainable, resulting in improved vertical or areal conformance of injected fluids and improved oil production.
Macrae & Co.
Marathon Oil Company
LandOfFree
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