Method for controlled placement of oilfield chemicals and...

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 8/536 (2006.01) C09K 8/54 (2006.01) E21B 37/06 (2006.01) E21B 41/02 (2006.01)

Patent

CA 2494200

Disclosed is a method for introducing additives into an oil, gas, or water injection well or pipeline in solid form at a location other than at the bottom. The method is practiced using pellets having a density sufficient to suspend the pellet at a top phase, bottom phase or at the interface of two phases of fluid within a wellbore. The pellets are prepared from a pellet matrix, such as an ethoxylated wax, and a weighting agent as well as an additive. By varying the amount of weighting agent, the density of the pellet can be varied to suspend it at a desired point to for a time sufficient to deliver the additive to the desired point within the wellbore.

L'invention concerne un procédé permettant d'introduire des additifs sous une forme solide dans un puits de pétrole, de gaz ou d'injection d'eau ou un pipeline, en un endroit autre que le fond. Le procédé est mis en oeuvre au moyen de boulettes présentant une densité suffisante pour être en suspension dans une phase supérieure, une phase inférieure ou à l'interface de deux phases de fluide dans un puits de forage. Les boulettes sont préparées à partir d'une matrice de boulettes, telle une cire éthoxylée, d'un alourdissant et d'un additif. En faisant varier la quantité de l'alourdissant, on peut agir sur la densité des boulettes afin de les suspendre en un point voulu et pendant une durée suffisante, ce qui permet d'amener l'additif au point voulu du puits.

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