| YANG Dong-ming,GE Peng-li,ZHU Yuan-yuan.Corrosion Prevention and Control Technology Application of Gathering and Transportation Pipelines in Tahe Oilfield[J],45(2):57-64 |
| Corrosion Prevention and Control Technology Application of Gathering and Transportation Pipelines in Tahe Oilfield |
| Received:November 02, 2015 Revised:February 20, 2016 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2016.02.009 |
| KeyWord:harsh corrosive environment gathering and transportation pipeline corrosion prevention corrosion control Tahe oilfield |
| Author | Institution |
| YANG Dong-ming |
Northwest Oil Field Branch Company Petroleum Engineering Technology Research Institute, Urumqi , China |
| GE Peng-li |
Northwest Oil Field Branch Company Petroleum Engineering Technology Research Institute, Urumqi , China |
| ZHU Yuan-yuan |
Northwest Oil Field Branch Company Petroleum Engineering Technology Research Institute, Urumqi , China |
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| Abstract: |
| Objective To improve the corrosion prevention ability of oil and gas gathering pipelines in the harsh corrosive environment, reduce the corrosion rate and the risk of environmental pollution as well as personnel injury caused by corrosion and perforation. Methods The internal corrosive environment is very harsh with high H2S, CO2, H2O, Cl-, high mineralization degree and low pH characteristics in Tahe Oilfield. By scientific research, the corrosion mechanism was revealed and the characteristics of corrosion law was determined. Referring to the corrosion prevention technology in China and foreign countries, the corrosion monitor was developed by self-dependent innovation and used in gathering and transportation pipeline, the pitting corrosion evaluation method of data, morphology and position was established, in order to improve the accuracy of monitoring and the precision of evaluation. Results Corrosion resistant steel pipe BX245-1Cr was invented, which had excellent mechanical properties and good corrosion resistance in H2O-H2S-CO2-Cl- corrosion environment. The corrosion rate was decreased by 37. 8% and the corrosion rate was decreased by 11% in the field test. The structure of nonmetallic pipe was optimized and improved, the resistance against strong erosion-corrosion was enhanced and electrostatic corrosion was eliminated by addition of the winding pipe of carbon black and glass fiber. The gas gathering pipelines with high contents of H2 S and CO2 used the corrosion inhibitor technology of " prefilming-continuous filling-batch processing" , which controlled the average corrosion rate at 0. 001 mm / a, and the point corrosion rate at 0. 0299 mm / a. The anticorrosion coating with air blow compressive smearing technology was used in oil gathering and transportation pipeline, which solved the problem of crack repair in the internal coating of 60 mm≤DN≤100 mm pipeline. The interpolation recovery technique of polyethylene pipe and the air blow compressive smearing technique were used in repairing of corroded gathering and transportation pipelines. Conclusion These results formed several corrosion prevention and control key technologies which were safe, economic, efficient, energy saving, and practical. The oilfield application effect was remarkable and the research provides technical reference and practical experience for corrosion control in domestic oil fields. |
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