| JIANG Hua-yi,ZHANG Ding-zhou,LIANG Ai-guo,CAI Hang-hang,SUN Na-na,CHONG Xin-min.Effect Mechanism of Material Type on Crystallization Growth of CaCO3-based Scale[J],47(12):255-262 |
| Effect Mechanism of Material Type on Crystallization Growth of CaCO3-based Scale |
| Received:July 11, 2018 Revised:December 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.12.034 |
| KeyWord:galvanized iron aluminum stainless steel brass fouling crystallization crystal morphology scale elements XRD patter analysis |
| Author | Institution |
| JIANG Hua-yi |
1.School of Petroleum Engineering, Xi’an Shiyou University, Xi’an , China |
| ZHANG Ding-zhou |
1.School of Petroleum Engineering, Xi’an Shiyou University, Xi’an , China |
| LIANG Ai-guo |
2.Karamay Hongshan Oilfield Company, Karamay , China |
| CAI Hang-hang |
1.School of Petroleum Engineering, Xi’an Shiyou University, Xi’an , China |
| SUN Na-na |
1.School of Petroleum Engineering, Xi’an Shiyou University, Xi’an , China |
| CHONG Xin-min |
3.No.1 Production Plant of Xinjiang Oil?eld Branch Company, Karamay , China |
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| Abstract: |
| The work aims to study the promoting effect of different materials on the crystallization of calcium carbonate by the aggregated scale removal method so as to settle the serious scale formation of gathering system and pipeline-clogging in the oil field. Galvanize iron, aluminum, 13Cr stainless steel, 316L stainless steel, H62 brass and H59 brass were used as the research objects in the dynamic simulation shear test to analyze the scale-formation characteristics of CaCO3 crystal on the surfaces of these different materials. SEM, XRD and EDS were used to study the crystalline morphology, grain distribution and elemental composition of deposited crystalline on the surfaces and then explore the mechanism how material type influenced the crystalli-zation growth. Material type had a great effect on the crystallization growth of CaCO3-based scale formation. The scale on the surface of galvanized iron was present as the layer scale with the largest volume (88.8 mg after 36 hours). The scale on the surface of 13Cr stainless steel was present in the form of particles with the smallest volume (-1.7 mg after 36 hours). The long-term calcium loss rate of galvanized iron was the highest (9.49% after 36 hours), and that for H59 brass was the lowest (4.77% for 36 hours). The distribution pattern of crystallization fouling on the surface of different materials and the oxidation reaction are main mechanisms for the great diversity in the growth characteristic of the scale. Layered scale can boost scale formation while grain scale acts as inhibitors for scale formation. Oxidation reaction on the surface has dual effect on the scale formation and a dense layer of oxide can prevent subsequent scale formation, while mixed scale is an activator for subsequent scale formation. |
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