高温压裂液对低流度型致密油压裂水平井产量影响因素模拟研究——以新疆昌吉J3水平井为例

The simulation study on the influencing factors of hot fracturing fluid on the production of MFHW in low viscosity tight oil:Taking well J3 as an instance in Changji,Xinjiang

高温压裂液技术对低流度型致密油起到降稠、有效避免储层冷伤害的作用,为找到不同压裂施工参数对低流度致密油开发效果的影响,建立井筒温度场模型和模拟压裂液的注入反排过程,得到精确的井筒温度场,并计算出高温压裂液从井口到井底的温度变化、各压裂施工参数对于生产过程的影响。研究后认为,低于54℃的高温压裂液从地面到达井底会升温,反之会降温;随压裂液温度的升高,初期能有效增产,随时间增长,增产效果下降;原油黏度对压裂液温度越敏感,高温压裂液的增产效果越明显,并随压裂液的温度增高,增产效果越好;注入高温压裂液后,关井时间越长,获得的累计产油量越小,但日产油量在关井半年时间能获得最大值。

Hot fracturing fluid technology is able to reduce the viscosity of low viscosity tight oil and effectively avoid the problem of reservoir cold damage.In order to find the influence of different fracturing operation parameters on the development effect of low viscosity tight oil,the temperature field of well bore and the simulation of the process of injection and reverse discharging of fracturing fluid are established,achieving the result of accurate temperature field by which the temperature change of fracturing fluid from well head to bottom can be made out and the influence of fracturing parameters on production.When the temperature of fracturing fluid is below 54 centigrade at surface,the temperature of fracturing fluid when it hit the bottom will be higher than the temperature at surface and the converse will be lower than its surface temperature.At early development stage,the production will significantly increase with the increase of the temperature of fracturing fluid,but the amplitude of increase will gradually decrease with time.The more sensitively the viscosity of crude oil changes with the fracturing temperature,the more effective the yield is.If the fracturing fluid is hotter,the effect of yield will be more obvious.After hot fracturing fluid is injected,the cumulative oil production will be lower with the longer time of shut-in of wells,but the daily oil production will reach the peak when the shut in time is half a year.