E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 33/138 (2006.01) C09K 8/44 (2006.01) E21B 33/00 (2006.01) E21B 43/00 (2006.01)
Patent
CA 2418817
A method of preventing gas breakthrough in an oil well, which includes first pumping a slug of an alkaline earth salt into the well bore, followed by a slug of spacer solution, and finally a slug of a fatty acid resin. The resin can comprise at least one fatty acid, a fat (or tall oil), and other components. The resin and alkaline earth salt advantageously react in situ to form a water and gas insoluble precipitate or gum that forms a sealing zone (123) around the oil/gas interface (119) of the well bore, and also allows the oil to dissolve the precipitate to facilitate recovery of the oil.
L'invention concerne un procédé permettant d'éviter les percées de gaz dans un puits de pétrole, qui consiste d'abord à injecter un bouchon de sel de métaux alcalins dans un puits de forage, puis un bouchon de solution intercalaire, et enfin un bouchon de résine d'acide gras. La résine peut comporter au moins un acide gras, un corps gras (ou un tall oil) et d'autres composants. La résine et le sel de métaux alcalins présentent l'avantage d'une réaction in situ qui permet de former un précipité ou une gomme insolubles dans l'eau et le gaz, constituant une zone d'étanchéité (123) autour de l'interface pétrole/gaz (119) du puits de forage, et cela permet en outre au pétrole de dissoudre le précipité pour faciliter l'extraction du pétrole.
Dawson Jeffrey C.
Metcalf Arthur Steven
Bj Services Company
Gowling Lafleur Henderson Llp
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