Horizontal wells have been used for water flooding operations for the purpose of pressure maintenance and improved oil recovery, e.g., in tight oil reservoirs. Injection profiling along the well lateral is required to determine the effectiveness of water flooding operations and to maintain high sweep efficiency. Recent improvements in downhole temperature monitoring tools allow monitoring the transient temperature along horizontal waterflooding wells at a relatively low cost. Temperature data can be analyzed to infer the injection profile along wellbore and locate high permeability regions that cause non-uniform rate distribution along the wellbore. In this work, an analytical model is developed to describe the transient temperature in the reservoir during cold fluid (water) injection via a horizontal well during injection and warmback periods. The analytical solution assumes linear flow in the reservoir and accounts for heat transfer by different mechanisms including convection, conduction, and heat gain from the surrounding impermeable strata. The inversion procedure is introduced to evaluate injection profiling using analytical solution–based type curves. Different cases are considered using a thermally coupled numerical reservoir simulator to verify the analytical approach and illustrate the potential application of the inversion technique. We show that the analytical approach introduced in this work is an efficient and robust technique to infer the injection profile along horizontal wells.

水平井已用于注水作业，以维持压力和改善油的采收率，例如在致密油藏中。为了确定注水作业的有效性并保持较高的吹扫效率，需要沿井眼进行注入剖面分析。井下温度监控工具的最新改进允许以相对较低的成本监控水平注水井的瞬态温度。可以分析温度数据以推断沿井眼的注入曲线，并定位高渗透率区域，这些区域会导致沿井眼的速率分布不均匀。在这项工作中，开发了一个分析模型来描述在注入和回暖期间通过水平井注入冷流体（水）期间储层中的瞬态温度。该分析解决方案假定储层中存在线性流动，并通过不同的机制（包括对流，传导和来自周围不可渗透地层的热量获取）解释了热传递。引入了反演程序，以使用基于解析解决方案的类型曲线来评估注射曲线。考虑使用热耦合数值油藏模拟器的不同情况，以验证分析方法并说明反演技术的潜在应用。我们表明，这项工作中引入的分析方法是一种有效且可靠的技术，可以推断沿水平井的注入剖面。和来自周围不可渗透地层的热量获取。引入了反演程序，以使用基于解析解决方案的类型曲线来评估注射曲线。考虑使用热耦合数值储层模拟器的不同情况，以验证分析方法并说明反演技术的潜在应用。我们表明，这项工作中引入的分析方法是一种有效且可靠的技术，可沿水平井推断注入剖面。和来自周围不可渗透地层的热量获取。引入了反演程序，以使用基于解析解决方案的类型曲线来评估注射曲线。考虑使用热耦合数值储层模拟器的不同情况，以验证分析方法并说明反演技术的潜在应用。我们表明，这项工作中引入的分析方法是一种有效且可靠的技术，可以推断沿水平井的注入剖面。