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该文应用数值模拟技术建立了水热型地热井地质模型,形成了局部井段生产时井筒温度图版,分析了局部存在高渗透层、日产量、套管尺寸对井筒温度的影响。研究表明,局部井段生产时井筒温度呈“完井非生产段—完井生产段—非完井段”三段式特点;厚储层中的地热井,满足产量和压力要求时,底部井段完井能获得比全井段完井更高的井口温度;实例井由上部井段生产转为全井段生产时,井口温度能增加12oC;井口温度随日产量的增加而增加,但产量大于2000 m3/d后,增加幅度非常小;若不能维持或及时补充地层压力,推荐7in套管完井,反之则推荐5in套管完井。该研究可用于评价地热井生产效果、优化完井方案和措施,对油田地热能的应用也具有借鉴作用。
In this paper, a geothermal model of hydrothermal geothermal wells was established by using numerical simulation technique. A wellbore temperature map was generated for local well section production. The effects of high permeation layer, daily output and casing size on wellbore temperature were analyzed. The results show that the wellbore temperature during the production of partial well section is in the form of three stages of non-productive completion section, completion production section and non-completion section. When geothermal wells in thick reservoirs meet the production and pressure requirements, The completion of the bottom section can obtain a higher wellhead temperature than the completion of the whole section. When the well is switched from the upper section to the whole section, the wellhead temperature can be increased by 12oC. The well head temperature increases with the increase of daily output, However, if the output is more than 2000 m3 / d, the increase will be very small. If the formation pressure can not be maintained or replenished timely, 7-in. Casing completions are recommended. Otherwise, 5-in. Casing completions are recommended. The study can be used to evaluate the geothermal well production effect, optimize the completion plan and measures, and can also be used as a reference for geothermal energy application in oilfields.