Abstract
Most of the oil wells enter the middle and late stages of extraction. After one oil extraction, water injection is needed for secondary extraction. With a large amount of calcium and magnesium ions in the water, which is easy to form a large amount of insoluble scale, its formed barium sulfate and strontium sulfate scale are more difficult to handle than carbonate scale. In order to reduce the difficulty of oil production work, this paper mainly targeted the sulfate scale for experiments, and prepared the scale retardant agent CQC-1. Through orthogonal experimental screening, the mass ratio of itaconate acid:methacrylic acid:AMPS:sodium acrylic sulfonate was 2:1:1:1, increase the amount of evocating agent was 8% and the reaction time was 4h, the sulfate scale inhibitor synthesized at the temperature of 80°C had the best performance. Using scale resistance rate, degradation and salt-resistance, the experimental results showed that the scale resistance rate of CQC-1 reached 90.46%. In the four-week degradation experiment, the degradation rate reached over 71% and was maintained by 80.65% at 150°C, while the scale resistance rate still reached 80.35% in simulated saline. It has excellent scale resistance, temperature resistance, salt-resistance and degradation, and has good development prospects.
Highlights
Nowadays, the oil production work in China has been carried out in the middle and late stages, leading to the change of mining mode and efficiency
With a large amount of calcium and magnesium ions in the water, which is easy to form a large amount of insoluble scale, its formed barium sulfate and strontium sulfate scale are more difficult to handle than carbonate scale
The mass ratio of itaconate acid:methacrylic acid:AMPS:sodium acrylic sulfonate was 2:1:1:1, increase the amount of evocating agent was 8% and the reaction time was 4h, the sulfate scale inhibitor synthesized at the temperature of 80 ̊C had the best performance
Summary
The oil production work in China has been carried out in the middle and late stages, leading to the change of mining mode and efficiency. In order to ensure enough pressure of oil production and the recovery of crude oil, most oil fields began to adopt water injection pressurized oil production [1]. With the strengthening of the national and people’s environmental awareness, the oilfield return water injection is treated and discharged after reaching the national standards, which is one of the important factors for oilfield oil production to achieve high efficiency, high efficiency and high environmental protection operation [3]. A large number of scale ions brings great challenges to the normal production of the oil field. What’s more, because the scale layer is not evenly covered on the metal surface, the pipe pipeline is exposed, causing serious local corrosion or spot corrosion perforation, which seriously endangering the normal operation of the pipeline [6] [7] [8]. How to prevent scale, how to remove these generated calcium scale and barium strontium scale has become a hot topic of research
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