Shale hydration inhibition agent and method of use

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 8/04 (2006.01) C09K 8/68 (2006.01) E21B 21/14 (2006.01)

Patent

CA 2681095

A water-base fluid for use in drilling, cementing, workover, fracturing and abandonment of subterranean wells through a formation containing a shale which swells in the presence of water. In one illustrative embodiment, the drilling fluid includes, an aqueous based continuous phase, a weighting agent, and a shale hydration inhibition agent. The shale hydration inhibition agent should have the general formula (I) in which R is independently selected from alkyls and hydroxyl alkyls comprising 1 to 15 carbon atoms, and X is an anion. The shale hydration inhibition agent is present in sufficient concentration to substantially reduce the swelling of shale drilling cuttings upon contact with the drilling fluid. The drilling fluid may be formulated to include a wide variety of components of aqueous based drilling fluids, such as weighting agents, fluid loss control agents, suspending agents, viscosifying agents, rheology control agents, as well as other compounds and materials known to one of skill in the art. The fluids may also be used in the disposal by reinjection of drilling cutting into a selected subterranean disposal formation.

L'invention concerne un fluide aqueux à utiliser dans le forage, la cémentation, le reconditionnement, la fracturation et l'abandon de puits souterrains à travers une formation contenant un schiste argileux qui gonfle en présence d'eau. Dans un mode de réalisation illustratif, le fluide de forage se compose d'une phase continue aqueuse, d'un alourdissant et d'un agent d'inhibition de l'hydratation du schiste argileux. L'agent d'inhibition de l'hydratation du schiste argileux est représenté par la formule générale (I), dans laquelle R est indépendamment choisi parmi les groupes alkyle et hydroxyl alkyls contenant 1 à 15 atomes de carbone, et X est un anion. L'agent d'inhibition de l'hydratation de schiste argileux est présent en concentration suffisante pour réduire sensiblement le gonflement des déplais de forage dans le schiste lorsqu'elles viennent en contact avec le fluide de forage. Le fluide de forage peut être formulé pour contenir une grande variété de composants de fluide de forage aqueux, tels que des alourdissants, des agents de régulation de perte de fluide, des agents de suspension, des agents améliorent la viscosité, des agents rhéologiques, de même que d'autres composants et matières connus des professionnels. Ces fluides peuvent être également utilisés dans l'évacuation par réinjection de déblais de forage dans une certaine formation d'évacuation souterraine.

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