Wells – Processes – Cyclic injection then production of a single well
Patent
1998-08-04
2000-11-21
Suchfield, George
Wells
Processes
Cyclic injection then production of a single well
166279, 507261, 507928, E21B 4312, E21B 4322
Patent
active
061489131
ABSTRACT:
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 50 ppm based on the total weight of the formulation.
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BP Chemicals Limited
Suchfield George
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