公开(公告)号：WO2022213174A1

公开(公告)日：2022-10-13

申请号：PCT/CA2022/000018

申请日：2022-04-05

Applicant: FLUID ENERGY GROUP LTD

Inventor： PURDY, Clay ,  WEISSENBERGER, Markus ,  NORDAA, Stig Magnor ,  ABDELFATAH, Elsayed

IPC: C02F5/14 ,  C02F5/08 ,  C02F5/12 ,  C09K8/528

Abstract: The present invention discloses a novel aqueous composition for use in removing petroleum- contaminated barium sulfate scale from a surface contaminated with such, said composition comprising: a chelating agent and a counterion component selected from the group consisting of: Li5DTPA; Na5DTPA; K5DTPA; Cs5DTPA; Na4EDTA; K4EDTA; TEAH4DTPA; and TBAH5DTPA; a scale removal enhancer; a non-ionic surfactant; and a hydrotrope. There is also disclosed methods to use such compositions.

公开(公告)号：WO2021003552A1

公开(公告)日：2021-01-14

申请号：PCT/CA2020/000083

申请日：2020-07-07

Applicant: FLUID ENERGY GROUP LTD

Inventor： PURDY, Clay ,  WEISSENBERGER, Markus ,  NORDAA, Stig Magnor

IPC: C02F5/08 ,  C09K13/00 ,  C09K8/528 ,  C23F14/02 ,  C23G1/14 ,  E21B37/06

Abstract: The present invention discloses a novel aqueous composition for use in removing mixed sulfate scale from a surface contaminated with such, said composition comprising: a chelating agent and a counterion component selected from the group consisting of: Li 5 DTPA; Na 5 DTPA; K 5 DTPA; Cs 5 DTPA; Na 4 EDTA; K 4 EDTA; TEAH 4 DTPA; and TBAH 5 DTPA; a dissolution enhancer; optionally a compound such as sodium gluconate or the like and a carboxyl-containing fructan such as carboxymethyl inulin. There is also disclosed methods to use such compositions.

公开(公告)号：WO2019041023A1

公开(公告)日：2019-03-07

申请号：PCT/CA2018/000166

申请日：2018-08-31

Applicant: FLUID ENERGY GROUP LTD.

Inventor： PURDY, Clay ,  WEISSENBERGER, Markus ,  NORDAA, Stig Magnor

IPC: C09K8/528 ,  C02F5/08 ,  C02F5/12 ,  E21B37/06 ,  E21B43/22

CPC classification number: C09K8/528 ,  C02F5/125 ,  C02F2101/101 ,  C02F2103/08 ,  C02F2103/10 ,  C02F2303/22 ,  C09K2208/20

Abstract: Sulfate scales, including barium, calcium, strontium, and radium sulfates, are known for being difficult to remove. Mineral acids are typically ineffective and the acid forms of chelating agents have limited efficacy. Specific salts of ethylenedienetetraacetic acid and diethylenetriaminepentaacetic acid including: Li5DTPA, Na5DTPA, K5DTPA, Cs5DTPA, Na4EDTA, K4EDTA, TEAH4DTPA, and TBAH5DTPA, show improved performance over the free acids. Additional enhancer molecules may be added to improve the effect. These compositions are particularly useful for removing sulfate scales from surfaces and oilfield equipment.