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1. (WO2017055892) SCALE DEPOSITION INHIBITING SCAVENGER COMPOSITIONS AND THEIR USE

Pub. No.:    WO/2017/055892    International Application No.:    PCT/IB2015/057482
Publication Date: Fri Apr 07 01:59:59 CEST 2017 International Filing Date: Thu Oct 01 01:59:59 CEST 2015
IPC: C09K 8/52
C02F 1/00
B01D 53/52
Applicants: SMI OILFIELD EQUIPMENT AND PRODUCTS FZE
Inventors: MCRAE, James
GOPAL, Suguna
ANNAMALAI, Anand
Title: SCALE DEPOSITION INHIBITING SCAVENGER COMPOSITIONS AND THEIR USE
Abstract:
A method of treating a fluid to reduce the level of H2S therein while inhibiting the deposition of scale on surfaces in contact with the fluid, comprising introducing into the fluid a triazine scavenger compound and a terpolymer. The fluid may be liquid or gas and may be petroleum, petroleum product, natural gas, liquefied petroleum gas or other type of oil fraction or refined oil. The triazine scavenger may be e.g. 1,3,5-tri(2- hydroxyethyl ) -hexahydro-1, 3, 5-triazine. The terpolymer may comprise a carboxylate/sulphonate/non-ionic terpolymer. When added to a wellbore fluid, it is effective as a scavenger of H2S and also reduces the amount of scale deposition on a surface in contact with the fluid when the fluid comes into contact with or is mixed with a brine. In some aspects, the composition increases the proportion of precipitated solids held in suspension when the fluid is contacted with or mixed with a brine.