Hydrocarbon recovery

Details Hydrocarbon recovery Hydrocarbon recovery

C - Chemistry, Metallurgy

09

K

C09K 8/504 (2006.01) C09K 8/08 (2006.01) C09K 8/16 (2006.01) C09K 8/514 (2006.01) E21B 33/138 (2006.01) E21B 43/02 (2006.01)

Patent

CA 2458504

Low concentrations, 1-10%, of potassium salt, especially potassium formate, are used in a drilling fluid in oil production. Preferably they are used with guar derivatives, most preferably carboxymethyl hydroxypropyl guar. The concentration of potassium formate is maintained at the desired level by adjusting the potassium formate to maintain a desired Zeta potential in the circulating drilling fluid. The potassium formate/guar derivative composition may be used in the substantial absence of hydrophilic clay additive.

Selon l'invention, de faibles concentrations, à savoir entre 1 et 10 %, de permanganate de potassium, notamment de formiate de potassium, sont utilisées dans un fluide de forage dans une production de pétrole. De préférence, ces concentrations sont utilisées avec des dérivés de guar, mieux encore de guar carboxyméthyl hydroxypropyle. La concentration de formiate de potassium est maintenue à un taux désiré par ajustement du formiate de potassium de façon à maintenir un potentiel Zeta désiré dans le fluide de forage. La composition dérivée de formiate de potassium/guar peut être utilisée lorsque l'additif de boue hydrophile est sensiblement absent.

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