废弃油气井改造的地热井换热性能影响因素模拟研究

doi:10.13809/j.cnki.cn32-1825/te.2022.06.003

摘要/Abstract

摘要：

采用中深层地埋管换热技术改造废弃或关停油气井是油田地热开发的一种方式，有助于油田低碳供热并降低地热开发成本。为了提高单井取热量及更好地指导改造工作，需对改造井换热性能的影响因素进行分析。通过数值模拟方法分析改造井换热性能的影响因素，分别对地质、井和工况等参数进行了分析。主要结论为：①地质参数中的地温梯度和岩层导热系数对单井取热量有较大影响，地质参数应作为改造选井首要考虑因素；②井参数中的井深、套管外径、中心换热管外径和导热系数对单井取热量有一定影响，在改造选井及方案制定时需要考虑；③工况参数中的入井水温和入井流速对单井取热量有影响，地面换热系统设计时应考虑工况参数的影响。此研究对于采用同类换热技术的改造目标井优选、改造方案制定、运行工况参数优化都具有参考意义。

关键词: 废弃油气井, 地热能, 中深层地埋管换热器, 导热系数, 数值模拟

Abstract:

The heat exchange technology of the medium-deep buried pipes of the abandoned oil and gas wells is one of the methods of oilfield geothermal development, which is helpful for low-carbon heating in oilfields and reduces the cost of geothermal development. In order to improve the heat transfer of a single well and better guide the reconstruction work, it is necessary to analyze the influencing factors of the heat transfer performance of the geothermal well after reconstruction. In this paper, numerical simulation method is used to analyze the influencing factors of the heat transfer performance of the geothermal well after reconstruction, and the parameters such as geology, well and working conditions are analyzed respectively. The main analysis conclusions are: ① The geothermal gradient and the thermal conductivity of the rock formation in the geological parameters have a great influence on the heat transfer of a single well, and the geological parameters should be the primary consideration factors in the selection of the stimulation target well. ② Well depth, casing outer diameter, and thermal conductivity of central heat exchange tube in the well parameters have certain influence on the heat exchange of a single well, which should be considered when selecting target well and formulating the reconstruction plan. ③ The water temperature and flow rate entering the well in the working condition parameters have an influence on the heat exchange of a single well, and the influence of the working condition parameters should be considered in the design of the surface heat exchange system. The research in this paper has reference significance for the selection of stimulation target wells, the formulation of stimulation plans, and the optimization of operating conditions parameters using the same heat exchange method.

Key words: abandoned oil and gas wells, geothermal well, geothermal energy, medium-deep geothermal borehole heat exchanger, thermal conductivity, numeral simulation

中图分类号:

TK529

郭鸿,夏岩,陈雷等. 废弃油气井改造的地热井换热性能影响因素模拟研究[J]. 油气藏评价与开发, 2022, 12(6): 850-858.

Hong GUO,Yan XIA,Lei CHEN, et al. Numerical simulation on influence factors of heat transfer performance of geothermal wells which transformed from abandoned oil and gas wells[J]. Petroleum Reservoir Evaluation and Development, 2022, 12(6): 850-858.

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