Preparation and performance evaluation of a highly effective barium sulfate descaling system based on ammonium carboxy chelating agent DTPA

Preparation and performance evaluation of a highly effective barium sulfate descaling system... In drilling and production process, the barite powder serving as weighting agent is added to ensure operation safety when overflow occurs, that results in reservoir pollution and pore blockage. The main component of barite is BaSO4, so ammonium carboxy chelating agents can be injected into formation to form stable chelates with Ba2+, BaSO4 will be eliminated from wellbore with flowback fluid easily. In this experiment, the weight method and the atomic absorption spectrometry method were utilized to study descaling ability and an action mechanism of descaling agents. Firstly, DTPA was selected from three descaling agents: NTA, EDTA, DTPA; then OT1 was screened out to synergize with DTPA and studied its descaling mechanism; eventually, the descaling system STD was determined, and its composition was 6% DTPA + 5% OT1 + 1% antiswelling agent + 100 ppm corrosion inhibitor. And the STD’s performance evaluation experiment results suggested that it had an excellent resistance to temperature and demonstrated a good descaling ability at 170°C. Furthermore, the descaling ability of STD was almost not affected by calcium and magnesium ions and its corrsion rate is lower than standard value. Moreover, STD could descale efficiently at lower dosage. So STD can be widely applied to descale in oilfield. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Applied Chemistry Springer Journals

Preparation and performance evaluation of a highly effective barium sulfate descaling system based on ammonium carboxy chelating agent DTPA

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Publisher
Pleiades Publishing
Copyright
Copyright © 2016 by Pleiades Publishing, Ltd.
Subject
Chemistry; Chemistry/Food Science, general; Industrial Chemistry/Chemical Engineering
ISSN
1070-4272
eISSN
1608-3296
D.O.I.
10.1134/S1070427216070156
Publisher site
See Article on Publisher Site

Abstract

In drilling and production process, the barite powder serving as weighting agent is added to ensure operation safety when overflow occurs, that results in reservoir pollution and pore blockage. The main component of barite is BaSO4, so ammonium carboxy chelating agents can be injected into formation to form stable chelates with Ba2+, BaSO4 will be eliminated from wellbore with flowback fluid easily. In this experiment, the weight method and the atomic absorption spectrometry method were utilized to study descaling ability and an action mechanism of descaling agents. Firstly, DTPA was selected from three descaling agents: NTA, EDTA, DTPA; then OT1 was screened out to synergize with DTPA and studied its descaling mechanism; eventually, the descaling system STD was determined, and its composition was 6% DTPA + 5% OT1 + 1% antiswelling agent + 100 ppm corrosion inhibitor. And the STD’s performance evaluation experiment results suggested that it had an excellent resistance to temperature and demonstrated a good descaling ability at 170°C. Furthermore, the descaling ability of STD was almost not affected by calcium and magnesium ions and its corrsion rate is lower than standard value. Moreover, STD could descale efficiently at lower dosage. So STD can be widely applied to descale in oilfield.

Journal

Russian Journal of Applied ChemistrySpringer Journals

Published: Oct 19, 2016

References

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