气藏压裂水平井温度剖面物理模拟实验研究

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测温(DTS)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,本文研究为实现基于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。

Physical simulation experiment on temperature profile of fractured horizontal well in gas reservoir

The temperature profile is irregular and the interpretation of production profile is difficult due to the large difference of fracture parameters at different levels in fractured horizontal wells of gas reservoir. A set of horizontal well physical simulation experimental device based on distributed optical fiber temperature measurement (DTS) is designed. The physical simulation experiment of temperature profile is carried out, and the influence of fracture conductivity on temperature profile is explored. The experimental results show that: with the increase of fracture conductivity, the production increases, and the temperature profile decreases as a whole. The temperature drop at the fracture location is basically positively correlated with the conductivity of the corresponding fracture; when the permeability of the gas reservoir increases, the temperature profile decreases as a whole; therefore, a method to quickly locate and identify high-yield fractures based on the experimental data of DTS temperature profile is proposed.The study provides experimental basis for fracture diagnosis and production profile interpretation of fractured horizontal wells in gas reservoirs based on DTS.