Method for treating oil and gas wells

E - Fixed Constructions – 21 – B

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E21B 33/14 (2006.01) C09K 8/42 (2006.01) E21B 33/12 (2006.01)

Patent

CA 2713238

A two step process for treating an oil or gas well. The first step uses a cross linking agent, such as borax, as a preliminary wash for the well following drilling. The cross linking agent cleans the well of excess mud and pre-coats the tubing and the formation surfaces with the cross linking agent. The second step introduces a cement-polymer mixture into the well. A polymer, such as for example polyvinyl alcohol, that undergoes cross linking when exposed to the cross linking agent is employed. When the polymer comes into contact with the cross linking agent in the well, cross linking of the polymer occurs. This cross linking helps to prevent fluid loss into the formation. Also, because the cross linking agent wash previously cleaned the surfaces of the tubing and the formation, better bonding between the cement and the surfaces of the tubing and the formation occurs.

La présente invention concerne un procédé en deux étapes de traitement d'un puits de pétrole ou de gaz. La première étape fait appel à un agent de réticulation, comme le borax, pour un lavage préliminaire du puits suite à son forage. L'agent de réticulation débarrasse le puits de la boue en excès et pré-enrobe la surface de la colonne de production et de la formation. La seconde étape consiste à introduire un mélange de ciment et de polymère dans le puits. On a recours à un polymère, tel que, par exemple, l'alcool polyvinylique, qui subit une réticulation lorsqu'il est exposé à l'agent de réticulation. Lorsque le polymère entre en contact avec l'agent de réticulation dans le puits, il y a réticulation du polymère. Cette réticulation contribue à prévenir la perte de fluide dans la formation. De même, comme le lavage au moyen de l'agent de réticulation a nettoyé au préalable la surface de la colonne de production et de la formation, on observe une meilleure adhérence du ciment à la surface de la colonne de production et de la formation.

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