西峰油田注入水磁处理防垢技术

以西峰油田注入水为研究对象,分析磁处理技术在不同温度、流速、延迟放置时间和磁场强度等条件下的防垢效果;同时研究了磁处理前后水分子聚集体微观结构的变化规律及磁化防垢的机理。结果表明,磁场强度、水流速度、温度以及磁化后延迟时间均影响磁处理防垢效果,其中,温度对磁处理的防垢效果影响最大;对于Ca2+浓度为1 800 mg/L的水样,在油藏温度条件下,磁场强度为99.22 A/m(7 900 Oe)、水流速度为5 mL/min时的防垢率为9.66%,而常温条件下的防垢率则高达85.34%;同时,在外加磁场的作用下,氢键结构被破坏,聚集水分子中氢原子受到的吸电子作用减弱,从而有利于水分子聚集体的分散,可以极大地减弱成垢离子的聚集。图4表5参12

Scale inhibition in injection water with magnetic treatment in Xifeng Oilfield

Taking the injected water in the Xifeng Oilfield as the object, the anti-scaling effect of magnetic treatment under different temperatures, flowing velocities, deposit time intervals and magnetic field intensities was studied. The variation rule of the water molecule aggregate microstructure before and after magnetic treatment and the scale inhibition mechanism were also discussed. The result showed that magnetic field strength, water velocity, temperature and delay time all affect the result of anti-scaling, among which temperature has the most influence. For the water sample containing 1 800 mg/L of Ca2+, the ratio of scale inhibition is 9.66% under the conditions of reservoir temperature, magnetic field strength of 99.22 A/m(7 900 Oe), and water velocity of 5 mL/min. However, the ratio of scale inhibition is as high as 85.34% under the room temperature. Under external magnetic field, hydrogen bond was disturbed, leading to the weakening of the electrophilic action which gathers the hydrogen atom in aggregate water molecule. That would be favorable for the dispersion of the water molecule aggregate and can greatly decrease the aggregation of scaling ions.