热采水平井注蒸汽过程中温度场扩展规律

Expansion law of temperature field during steam injection in thermal production horizontal well

水平井注蒸汽开采技术是稠油油藏开采的重要技术,因水平段长度大及油藏非均质性,会导致实际配汽效果较差等问题。使用Fluent软件模拟了不同注汽井结构下的油藏温度变化及油藏吸汽量,并设计搭建水平井配汽三维物模实验平台,分析了均质储层条件下使用不同管柱的油藏温度场变化。结果表明:均匀射孔管柱所得油藏温度和油藏分段吸汽量由注汽井跟端到趾端逐渐降低,而通过加密趾端射孔,油藏温度和分段吸汽量较为均匀。割缝管和均匀射孔管柱温度场发育主要集中在注汽井跟端,趾端发育缓慢甚至不发育,对趾端射孔加密,温度场基本平行于注汽井,均衡向前推进,配汽较为均匀,与数值模拟结果形成对应。

The steam injection technology of horizontal wells has become an important heavy oil reservoir production technology.Due to the large length of horizontal section and reservoir heterogeneity,the actual steam distribution effect was poor.In this paper,Fluent was used to simulate reservoir temperature changes and reservoir steam absorption capacity under different steam injection well structures.A three-dimensional material model experiment platform for horizontal well steam distribution was designed,the temperature field changes in reservoirs of different pipe strings under homogeneous reservoirs was analyzed.The results showed that the reservoir temperature and segmented steam absorption amount obtained by uniform perforation string decreased gradually from the heel end to the toe end of injection well.The reservoir temperature and segmented steam absorption amount were uniform by infilling the perforation of toe end.The temperature field development of slit pipe and uniform perforation pipe string mainly focused on the heel end of steam injection well,while the toe end developed slowly or even not.After infilling the perforation of toe end,and the temperature field was basically parallel to the steam injection well to advance equably,then the uniform steam distribution was realized,which is corresponding to the numerical simulation results.