热水驱开采高凝油数模研究

方法 利用数值模拟方法,研究了热水驱开采高凝油油藏中注水温度对油藏温度、油层开采效果、注水井井底压力及油层吸水能力等的影响。目的 掌握不驱开采高凝油的一般规律,为提高热水驱开采效果作参考。结果 在高凝油油藏中,注水温度影响地层半径有限。当注水温度在析蜡温度以下,原油中的蜡晶析出,堵塞孔隙介质通道,渗流阻力增大,注入进进底压力下不去,注入速度上不来,导致油藏中能力低;注水温度在析蜡温度以上,渗流阻小

Numerical simulation of high pour-point oil production with hot water flooding.

Method The numerical simulation has been taken to study the influence of water temperature on reservoir temperature, reservoir production effect, BHP of injection well and water injectivity in high pour-point reservoirs. Purpose To understand the general rule of hot water flooding of high pour-point oil, as used for reference of increasing production effect of hot water flooding. Result Water temperature affected formation radius in high pour-point crude oil reservoirs is well within limits. When the temperature is below wax-melting point, wax will precipitate from the crude oil, which will block the path of pore medium resulting in increase of flow resistance. As a result, bottom hole pressure of water injection well remains high and withholds the injection rate, as leads to weak water injectivity into reservoirs. It is on the contrary when it is over wax-melting temperature. Conclusion The recovery efficiency could be enhanced when water of proper temperature is injected according to the crude oil characteristics.