摘要
干热岩是一种新型能源,其应用原理是在地层中不渗透的干热岩体内形成热交换系统,取出热水,进行发电或取暖等。我国高温岩体干热岩地热资源储量丰富,地壳深层岩体温度高。发达国家已经掌握了干热岩发电的基本原理和基本技术,我国在其开发利用方面处于探索阶段。干热岩开发经常采用一注一采系统或一注三采系统。FLUENT程序软件能够模拟裂缝内温度场。通过研究,比较不同类型井网裂缝对冷水的升温规律,量化裂缝长度、宽度、注入排量等。分析表明:①裂缝的宽度决定了合理注入排量。裂缝宽度越大,能够使得足够多的流体升温到与基岩一样的温度,即合理注入排量越大。同时增加裂缝宽度,有利于降低泵注压力,减小泵动力消耗。②对于不同的裂缝宽度及不同的流量,裂缝长度必须达到一定程度后,水温才能升高到与基岩一致;裂缝宽度越小,在给定的排量下,达到最高温度所需要的裂缝长度越长。③针对一注一采井网,在既定条件下,当井间裂缝长度(井间距)为300m,裂缝宽度为6mm时,合理排量可达1.2方/分。④比较一注一采与一注三采井网,由于接触面积增加,后者能满足更高排量液体升温的需要。
Dry hot rock is a new type of energy. Its application principle is to form a heat exchange system in the impermeable dry hot rock, take out hot water, and generate electricity or heat. China has abundant geothermal resources of high-temperature rock. Developed countries have mastered the basic principle and basic technology of dry hot rock power generation. China is in the exploratory stage in its development and utilization. One injection-one production system or one injection-three production system is often used in dry hot rock development. FLUENT can simulate the temperature increasing in the fracture. Through the study, the heating law of different types of well-fracture pattern on cold water is compared, and the length, width and injection displacement of fractures are quantified. The analysis shows that :①The width of fracture determines the reasonable injection displacement. The larger the fracture width is, the more fluid can be heated to the same temperature as the bedrock, that is, the larger the reasonable injection displacement is. At the same time, increasing the crack width is conducive to reduce the pumping pressure and the pump power.②For different crack widths and flowing rates, the crack length must reach a certain degree before the water temperature rised to be consistent with the bedrock;The smaller the fracture width, the longer the fracture length is required to reach the maximum temperature at a given displacement.③For the one-injection-one-production well pattern, under the given conditions, when the fracture length(well-spacing) is 300 m and the fracture width is 6 mm, the reasonable displacement can reach 1.2 m^3/min.④Comparing the one-injection-one-production and one-injection-three-production well pattern, the latter can meet the demand of higher liquid displacement which temperature can be heated to the same temperature as the bedrock due to the increasing of contacting area.
作者
刘元爽
程芳桂
雷俊雄
LIU Yuan-shuang;CHENG Fang-gui;LEI Jun-xiong(Guangdong institute of petrochemical industry,Guangdong Maoming 525000;Engineering Technology Branch of CNOOC Energy Development Co.,Ltd.)
出处
《内蒙古石油化工》
CAS
2020年第4期25-28,共4页
Inner Mongolia Petrochemical Industry
关键词
干热岩
井网
模型
裂缝宽度
裂缝长度
排量
Hot dry rock
Well pattern
Model
Fracture width
Fracture length
Liquid displacement
作者简介
刘元爽(1968-),女,河南方城人,工程师,毕业于西南石油大学,目前为广东石油化工学院教师,从事油气储运专业实验教学工作。
