Breaker and displacement fluid and method of use

Details Breaker and displacement fluid and method of use Breaker and displacement fluid and method of use

C - Chemistry, Metallurgy

09

K

C09K 8/52 (2006.01) E21B 37/06 (2006.01) E21B 37/08 (2006.01)

Patent

CA 2677840

A method of cleaning a wellbore prior to the production of oil or gas is disclosed, wherein the wellbore has been drilled with an invert emulsion drilling mud that forms an invert emulsion filter cake. The method may include the steps of circulating a breaker fluid into the wellbore, where the breaker fluid includes an aqueous fluid, and immino diacctic acid or salt thereof. Optionally an acid buffering agent, and a weighting age are also included. The breaker fluid is formulated such that after a predetermined period of time and the filter cake present in the wellbore or on the wellbore face is substantially degraded. Other methods may also include drilling the wellbore with a water-based drilling mud that forms a water-based filter cake, wherein the method may include the steps of circulating a breaker fluid into the wellbore, where the breaker fluid may include an aqueous fluid, and an iminodiacetic acid or a salt thereof.

L'invention concerne un procédé de nettoyage d'un puits de forage avant la production de pétrole ou de gaz, le puits de forage ayant été foré avec une boue de forage à émulsion inverse qui forme un gâteau de filtration d'émulsion inverse. Le procédé peut comprendre les étapes consistant à faire circuler un liquide de rupture dans le puits de forage, le liquide de rupture comprenant un fluide aqueux et de l'acide imino-diacétique ou un sel de celui-ci. Facultativement, un agent de tamponnage acide et un agent d'alourdissement sont également inclus. Le liquide de rupture est formulé de sorte qu'après une période prédéterminée, le gâteau de filtration présent dans le puits de forage ou sur la face du puits de forage est sensiblement dégradé. D'autres procédés peuvent également comprendre le forage du puits de forage avec une boue de forage à base d'eau qui forme un gâteau de filtration à base d'eau, le procédé pouvant comprendre l'étape consistant à mettre en circulation un liquide de rupture dans le puits de forage, le liquide de rupture pouvant comprendre un liquide aqueux, et un acide imino-diacétique ou un sel de celui-ci.

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