气藏压裂水平井温度剖面物理模拟实验

Physical Simulation Experiment on Temperature Profile of Fractured Horizontal Well in Gas Reservoir

针对气藏压裂水平井各级裂缝参数差异较大所导致的温度剖面无规律、产出剖面解释困难等问题,设计了一套基于分布式光纤传感(distributed temperature sensing,DTS)技术的水平井物理模拟实验装置,开展了温度剖面物理模拟实验研究,探究了裂缝导流能力对温度剖面的影响规律。实验结果表明:随着裂缝导流能力的增大,产量增大,温度剖面整体下降,裂缝位置处的温降与对应裂缝的导流能力基本呈正相关;气藏储层渗透率增大时,温度剖面整体下降。据此还提出了一种基于DTS温度剖面实验数据实现快速定位、识别高产裂缝的方法。为实现基于DTS的气藏压裂水平井裂缝诊断及产出剖面解释提供实验依据。

Aiming at the problems of irregular temperature profile and difficulty in interpretation of production profile caused by the large difference of fracture parameters at all levels of fractured horizontal wells in gas reservoirs,a set of horizontal well physical simulation experiment device based on distributed temperature sensing(DTS)technology was designed,physical simulation experiment of temperature profile was carried out,and the influence of fracture conductivity on temperature profile was explored.The experimental results show that as the fracture conductivity increases,the output increases,the temperature profile decreases overall,the temperature drop at the fracture location is basically positively correlated with the corresponding fracture conductivity.When the permeability of the gas reservoir increases,the temperature profile decreases as a whole.A method to quickly locate and identify high-yield cracks based on the experimental data of the DTS temperature profile was also proposed.The study provides experimental basis for fracture diagnosis and production profile interpretation of fractured horizontal wells in gas reservoirs based on DTS.