E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 37/06 (2006.01) C09K 8/524 (2006.01) C09K 8/528 (2006.01) C09K 8/54 (2006.01) E21B 43/22 (2006.01)
Patent
CA 2245886
This invention is a process and a formulation for minimising the squeezing and shut-in operations needed to inhibit scale in a production well using the precipitation squeeze method by injecting into an oil-bearing rock formation a water-miscible formulation comprising: (a) a water-miscible surfactant which is in liquid form, (b) a solution of water- soluble metal salt comprising a multivalent cation and (c) a solution of a water-miscible scale-inhibiting compound comprising an anionic component capable of forming a scale-inhibiting precipitate in situ in the presence of the cations in (b) upon injection into the rock formation, wherein the surfactant is a glycol ether and the minimum ion concentration of the scale-inhibiting compound (c) is 5000 ppm based on the total weight of the formulation.
L'invention concerne un procédé et une formulation servant à limiter au minimum les opérations d'injection et de compression d'une composition aqueuse contenant un inhibiteur de calcaire dans un puits de production. Ce procédé de compression et de précipitation consiste à injecter dans une formation rocheuse pétrolifère une formulation miscible dans l'eau comprenant: (a) un tensioactif miscible dans l'eau sous forme liquide, (b) une solution d'un sel de métal soluble dans l'eau contenant un cation polyvalent et (c) une solution d'un composé miscible dans l'eau inhibant la formation de calcaire et contenant un constituant anionique capable de former un précipité inhibant le calcaire dans la formation rocheuse en présence des cations de (b) lorsqu'on l'injecte dans la formation, le tensioactif étant un glycol éther et la concentration minimum d'ions du composé (c) étant de 5000 ppm sur la base du poids total de la formulation.
Bp Chemicals Limited
Fetherstonhaugh & Co.
LandOfFree
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