稠油油藏水平井热采非等温流入动态模型

将常规油藏水平井三维稳态势分布模式引入到水平井蒸汽吞吐开发油藏,以Marx_Langenheim加热理论为基础,把水平井筒处理成由若干个流量、温度不等的微元段线汇组成,建立了非等温油藏内渗流与水平井筒内变质量变温度管流耦合的流入动态模型.利用该流入动态模型,可以计算水平井注蒸汽后的地层参数,也可以模拟计算水平井筒在不同温度分布剖面下的产量和压力分布,分析流入动态的诸多影响因素,从而为优选采油参数提供了依据.计算实例表明:蒸汽吞吐水平井的流入动态受水平井筒的非等温状况影响较大.水平段首、尾两端温差越大,水平井筒压降就越大,产能也越低,水平段产量分布的对称性变差,指端产量远低于跟端产量.

Non-isothermal inflow performance model for horizontal well in heavy oil reservoir with thermal recovery

A coupling inflow performance model for describing the flow in the non-isothermal reservoir and the variable mass flow and temperature in horizontal well-bore was developed,on the basis of Marx-Langenheim heating theory and the 3D steady potential distribution in different types of reservoirs.The horizontal well-bore was divided into several discrete intervals with different flow rate and temperature under the supposition of different temperature distribution along the horizontal well bore.This model can be used to calculate the production and pressure distributions along the horizontal well-bore under the different temperature distribution and to analyze the factors affecting inflow performance,such as pressure drop,temperature distribution and length of horizontal section.The calculation results show that the non-isothermal condition along the horizontal well-bore can greatly affect the inflow performance.The pressure drop increased and the production capacity in the horizontal well-bore decreased with the increase of temperature difference between two ends of the horizontal section in a horizontal well.