Method for scale inhibition in oil producing wells

Details Method for scale inhibition in oil producing wells Method for scale inhibition in oil producing wells

1990-06-29

1992-02-25

Suchfield, George A.

Wells

Processes

Material placed in pores of formation to treat resident...

166300, E21B 4312, E21B 4322

Patent

active

050904795

ABSTRACT:
A method for inhibiting scale formation in oil producing wells. The method comprises pretreating the rock formation of the near well bore area with a surface agent and then a saline solution by injecting these down the well bore. Subsequently the formation is treated with a source of divalent cations such as calcium. An acid inhibitor in the form of a polyacrylic acid derivative, a phosphonated or a phosphinopolycarboxylic acid is then injected into the rock formation and allowed to soak in for a period of 24 hours. The inhibitor is retained on the surface area of the rock formation by means of divalent cationic bonds.

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