Oilwell sealant compositions comprising alkali swellable latex

Details Oilwell sealant compositions comprising alkali swellable latex Oilwell sealant compositions comprising alkali swellable latex

C - Chemistry, Metallurgy

09

K

C09K 8/504 (2006.01) C09K 8/487 (2006.01) C09K 8/508 (2006.01) C09K 8/512 (2006.01)

Patent

CA 2590169

Sealant compositions comprising an alkali swellable latex and a pH increasing material and methods of using the same to service a wellbore are provided. In one embodiment, the sealant composition can be used in a wellbore and includes an alkali swellable latex and a pH increasing material. The sealant composition can have a pH of from about 7 to about 14. In other embodiments, the pH increasing material includes a base-producing material. The base~producing material can include alkali and alkali earth metal carbonates, alkali and alkali earth metal bicarbonates, alkali and alkali earth metal hydroxides, alkali and alkali earth metal oxides, alkali and alkali earth metal phosphates, alkali and alkali earth metal hydrogen phosphates, alkali and alkaline earth metal sulphides, alkali and alkaline earth metal salts of silicates, alkali and alkaline earth metal salts of aluminates, water soluble or water dispersible organic amines, polymeric amine, amino alcohols, or combinations thereof.

Cette invention concerne des compositions d~étanchéité comprenant un latex gonflant en présence d~alcalis et un matériau augmentant le pH ; elle concerne également des procédés d~utilisation de ces compositions pour entretenir un puits de forage. Dans un mode de réalisation, la composition d~étanchéité peut être utilisée dans un puits de forage et elle contient un latex gonflant en présence d'alcalis ainsi qu~un matériau augmentant le pH. La composition d~étanchéité peut avoir un pH variant d~environ 7 à environ 14. Dans d~autres modes de réalisation, le matériau augmentant le pH inclut un matériau produisant une base, lequel peut inclure des carbonates, bicarbonates, hydroxydes, oxydes, phosphates, hydrogénophosphates, sulfures, sels de silicates et sels d~aluminates de métaux alcalins et alcalino-terreux ; des amines organiques hydrosolubles ou dispersibles dans l~eau ; des amines polymères ; des alcools aminés ; ou leurs combinaisons.

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