Calculation method of reasonable well spacing in sandstone geothermal reservoir based on production-reinjection equilibrium simulation
-
摘要: (目的)为实现地热能可持续开发利用的目标,需要明确不同采灌条件下合理的采灌井间距。为此,以鲁北馆陶组热储为研究对象,(方法)建立了层状热储开发的概念模型及数学模型,采用COMSOL Multiphysics多场耦合模拟软件建立了地热对井采灌井距计算器。通过参数拟合及模拟结果对比,验证了模型的准确性;进而以软件APP编译功能为基础,以普通用户使用为导向,简化相关参数输入,建立了地热采灌井距计算APP。为适应实际生产需求,计算了不同采灌量条件下对应的合理采灌井距。(结果)鲁北地区馆陶组热储采灌量分别为40m3/h、60m3/h、80m3/h和100m3/h时,不发生热突破的合理采灌井距分别为290m、330m、360m和390m。(结论)表明:①在鲁北层状传导型砂岩热储地区,对概念模型进行简化处理后,数值模拟计算结果可靠,可以在该地区建立合理采灌井距计算APP;②水热数值模拟是合理采灌井距计算的有力手段,能够确定开采量、回灌量、回灌温度、采灌井距等地热开发利用工程的关键参数,有利于实现地热资源可持续开发利用。Abstract: (Objective) In order to achieve the goal of sustainable development and utilization of geothermal energy, it is necessary to clarify the production-reinjection well spacing under different reinjection quantities and reinjection temperatures. (Methods) Therefore, taking the thermal reservoir of Guantao Formation in northern Shandong as the research object, the conceptual model and mathematical model of layered thermal reservoir development are established. COMSOL Multiphysics multi-field coupling simulation software was used to establish a geothermal production-reinjection well spacing calculator. The accuracy of the model is verified by parameter fitting and simulation results. (Results) Then, based on the software APP compilation function, guided by the use of ordinary users, the relevant parameter input is simplified, and the APP for geothermal production-reinjection well spacing calculator is established. Different from the previous studies, which only gave the production-reinjection well spacing, in order to meet the actual production needs, the corresponding reasonable production-reinjection well spacing was calculated under different conditions. The calculation results show that when the exploitation quantities are 40m3/h, 60m3/h,80m3/h and 100m3/h,the reasonable production-reinjection well spacing without thermal breakthrough is 290m, 330m, 360m and 390m respectively.(Conclusion) It is concluded that: In the layered conductive sandstone thermal reservoir area of northern Shandong, after the conceptual model is simplified, the numerical simulation results are reliable, and the geothermal production-reinjection well spacing calculator can be established in this area. Hydrothermal numerical simulation is a powerful means to calculate the reasonable production-reinjection well spacing. It can determine the key parameters of geothermal development and utilization projects, such as exploitation quantity, recharge quantity, injection temperature and production-reinjection well spacing, which is conducive to the sustainable development and utilization of geothermal resources.
点击查看大图
计量
- 文章访问数: 80
- PDF下载量: 4
- 被引次数: 0