Prevention of water and condensate blocks in wells

Details Prevention of water and condensate blocks in wells Prevention of water and condensate blocks in wells

E - Fixed Constructions

21

B

E21B 43/22 (2006.01) C09K 8/584 (2006.01) C09K 8/588 (2006.01)

Patent

CA 2617315

Compositions and methods are given to prevent, alleviate and remedy water blocks and gas blocks (condensate block or condensate banking). Wettability modifiers are contacted with the formation to change the surfaces from water wet or oil wet to intermediate wet or gas wet. Preferred wettability modifiers include partially or completely fluorinated surfactants or polymers, for example fluorosilanes such as perfluorosilanes, urethane oligomers containing perfluoro alkyl moieties, fluoroacrylates, and fluoroalkyl containing terpolymers or their mixtures. Other examples include surfactants, for example viscoelastic surfactants such as cationic surfactants such as quaternary amines, and zwitterionic surfactants, such as betaines, optionally mixed with co-surfactants.

L'invention concerne des compositions et des procédés pouvant prévenir, atténuer ou remédier à l'apparition de blocs d'eau ou de blocs de gaz (blocs de condensat ou recirculation de condensat). Des modificateurs de mouillabilité sont placés au contact de la formation afin de modifier les surfaces humidifiées à l'eau ou à l'huile en surfaces à humidité intermédiaire ou gazeuse. Des modificateurs de mouillabilité préférés comprennent, en totalité ou en partie, des tensioactifs ou des polymères fluorés, par exemple des fluorosilanes, tels que des perfluorosilanes, des oligomères d'uréthane contenant des fragments d'alkyle perfluoré, des fluoroacrylates et des fluoroalkyle contenant des terpolymères, ou leurs mélanges. D'autres exemples comprennent des tensioactifs, par exemple des tensioactifs viscoélastiques, notamment des tensioactifs cationiques tels que des amines quaternaire, et des tensioactifs zwittérioniques tels que des bétaïnes, éventuellement mélangés avec des co-tensioactifs.

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