Journal of Southwest Petroleum University(Science & Technology Edition) ›› 2022, Vol. 44 ›› Issue (5): 175-184.DOI: 10.11885/j.issn.1674-5086.2022.01.05.03

• PETROLEUM MACHINERY AND OILFIELD CHEMISTRY • Previous Articles    

The Study of Effect of Inhibitors on BaSO4 Crystallization Kinetic Parameters

LI Haitao1, LI Ran1, LIU Tao2, ZHENG Chao3, LIU Wenju1   

  1. 1. Petroleum Engineering School, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    2. Engineering and Technology Research Institute, Karamay Oilfield, CNPC, Karamay, Xinjiang 834000, China;
    3. Laojunmiao Oil Production Plant, Yumen Oilfield, CNPC, Jiuquan, Gansu 735000, China
  • Received:2022-01-05 Published:2022-10-28

Abstract: Taking the process of barium sulfate crystal as the research object, induction period, Gibbs free energy and activation energy of barium sulfate solution with and without odium diethylene triamine pentacetate (DTPA-5Na), ethylene diamine tetra methylene phosphonate (EDTMPS) and diethylene triamine penta (DTPMP) were analyzed based on the homogeneous theory. The impact of inhibitor on the morphology and characteristic peak also were studied by SEM and XRD respectively. It was found that the induction period and activation energy increased, Gibbs free energy of barium sulfate also increased by 10.52, 8.06, 6.18 mJ/m2 respectively at the temperature from 298 K to 318 K and concentration of Ba2+ and SO42- from 0.5~1.2 mmol/L. Meanwhile, morphology of BaSO4 crystals were changed significantly and crystalline grain was smaller and more dispersed. Characteristic peak of some surface of BaSO4 became weaker. DTPA–5Na, EDTMPS and DTPMP prevented barium sulfate from growing at different levels.

Key words: barium sulfate crystal, induction period, Gibbs free energy, inhibitors, crystal morphology and diffracted intensity

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