High performance water based drilling mud and method of use

Details High performance water based drilling mud and method of use High performance water based drilling mud and method of use

C - Chemistry, Metallurgy

09

K

C09K 8/24 (2006.01) C09K 8/22 (2006.01)

Patent

CA 2474614

A water-base fluid for use in drilling wells and other drilling operation includes a shale clay which swells in the presence of water. The fluid preferably includes: an aqueous based continuous phase, and a shale hydration inhibition agent having the formula: H-(OR), -[-NH-CH2-CH2-CH2-O-CH2-CH2-NH-]-(R'O)y-H wherein R and R' are independently selectable alkylene groups having 2 to 4 carbon atoms, and wherein x and y have independently selected values such that the sum of x and y is at least 1. The shale hydration inhibition agent should be present in sufficient concentration to reduce the swelling of the shale clay. The fluid may be used for formulating drilling fluids such as water-base drilling muds or clear brine drilling fluids. The fluid may also be used in the slurrification and disposal of drill cuttings that contain water swellable clays or shale clays.

La présente invention concerne un liquide à base d'eau destiné au forage de puits et autres opérations de forage, qui comprend une argile schisteuse qui gonfle en présence d'eau. Le liquide de l'invention comprend de préférence : une phase continue à base aqueuse, et un agent inhibiteur de l'hydratation du schiste de la formule : H - (OR)¿x ?- [-NH-CH¿2?-CH¿2?-CH¿2?-O-CH¿2?-CH¿2?-NH-] - (R'O)¿y? - H, dans laquelle R et R' sont des groupes alkylène renfermant de 2 à 4 atomes de carbone pouvant être choisis indépendamment, et dans laquelle x et y possèdent des valeurs choisies indépendamment telles que la somme de x et de y est de au moins 1. L'agent inhibiteur de l'hydratation du schiste devrait être présent en une concentration suffisante pour réduire le gonflement de l'argile schisteuse. On peut utiliser le liquide de l'invention pour formuler des liquides de forage tels que des boues de forage à base d'eau ou à base de saumure transparente. On peut également utiliser le liquide de l'invention pour liquéfier et éliminer des sciures de forage contenant des argiles ou des argiles schisteuses gonflant dans l'eau.

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