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Aiming at the serious problem of tubing corrosion in huff and puff well, the corrosion. products of carbon dioxide stimulation wells were analyzed. The corrosion type of huff and puff oil well are determined as carbon dioxide corrosion. by using methods of microscopic morphology analysis. energy spectrum analysis. metallographic analysis and X-ray diffraction analysis. Basing on the study of corrosion law. a comprehensive corrosion prevention and control technology thought was put forward, which includes liquid corrosion inhibitor. solid corrosion inhibitor and other chemical corrosion protection technology as primary. deepening liner protection technology. sacrificial anode protection technology and tubing coating protection technology as auxiliary. The reasonable dosage concentration and dosage method of corrosion inhibitors were determined through experiments. Field tests were carried out in 69 wells, and the oil well lifetime has been extended from 260 days to 400 days, which verifies the effectiveness of the comprehensive corrosion prevention and control technology. [ABSTRACT FROM AUTHOR]

In this paper, using raw materials of lauric acid, chlorosulfonic acid,N, N-DMEA and brom-decane, synthesized a new type of amphiprotic gemini surfactants, i. e. α-sulfonic acid - lauryl acyl oxygen thyl - dimethyl dodecyl ammonium bromide. And characterized the structure of the final outcome by the infrared spectrum, and evaluated the surface activity, compound property, emulsification and foamability f the synthetic. [ABSTRACT FROM AUTHOR]

Imitation method is used in laboratory to study mud cake solidification for increasing the bonding strength of cement-- formation interface under different temperatures and different cake thickness. The results show that the bonding strength of cement--formation interface increased by 230.86%~4538.74% and 757.30%~106 537. 50% respectively when the cake thickness are 0.5mm and 1.0mm at the curing temperature 45 °C; the bonding strength of cement--formation interface increased by 656. 28%~1979. 69%and 331. 19%~5 258.82% respectively when the cake thickness are 0. 5 mm and 1.0 mm at the curing temperature 80°C. Finally, main cause of mud cake solidification for increasing the bonding strength of cement--formation interface is investigated by infrared spectrum test results and influencing factors is analyzed. [ABSTRACT FROM AUTHOR]