摘要
深层、超深层已被列为油气资源重要接替区。但是,深层带来的井下高温使得随钻仪器寿命缩短、甚至失效,为其增加井下降温系统是解决随钻仪器抗高温性能的措施之一。在前期研究随钻仪器井下降温系统阻热性能和传热特性的基础上,进一步研究了井下降温系统的冷却效果,建立了井下降温系统模型,通过数值方法研究了各参数对井下电路产生降温幅度的影响。研究结果表明:增加井下降温装置,可有效提高随钻仪器抗高温性能;各参数对冷却效果影响规律为绝热材料导热系数越小、绝热材料厚度越大、电路系统尺寸越小、制冷功率越大及环境与水眼温差越大,越有利于改善冷却效果;电路系统导热系数对冷却效果的影响可忽略不计;各参数对冷却效果影响程度排序为,在绝热材料方面,导热系数>高度和宽度方向充填厚度>轴向充填厚度;在电路系统方面,长度>宽度和高度>导热系数;在降温装置方面,制冷功率与发热功率比值>高度和直径。所得结果丰富了随钻仪器井下降温相关理论,可为井下降温系统的开发提供指导。
Deep and ultra-deep reservoirs have been listed as important replacement areas for oil and gas resources.However,downhole high temperature in deep layers shortens the service life of the instrument while drilling,and even makes it fail.Adding downhole cooling system is one of the measures to improve the high temperature resistance of instrument while drilling.Based on previous researches on the thermal resistance and heat transfer characteristics of downhole cooling system,the cooling effect of downhole cooling system was studied in this paper,and a model of downhole cooling system was established.Numerical method was used to study the influence of various parameters on the cooling range of downhole circuit.The results show that adding downhole cooling system is effective to improve the high temperature resistance of the instrument while drilling.The influences of various parameters on the cooling effect are presented as follows:the smaller the thermal conductivity of insulation materials,the larger the thickness of insulation materials,the smaller the size of circuit system,the larger the cooling power and the larger the temperature difference between environment and water hole,the better the cooling effect;the influence of the thermal conductivity of the circuit system on the cooling effect is negligible;the influence degree of each parameter on cooling effect is as follows:thermal conductivity>filling thickness in height and width direction>axial filling thickness in terms of thermal insulation materials;length>width and height>thermal conductivity in terms of circuit system;the ratio of cooling power to heating power>height and diameter in terms of cooling device.These results enrich the theory of downhole cooling of the instrument while drilling and provide guidance for the development of downhole cooling system.
作者
刘珂
苏义脑
高文凯
窦修荣
Liu Ke;Su Yinao;Gao Wenkai;Dou Xiurong(CNPC Engineering Technology R&D Company Limited;Research Institute of Petroleum Exploration&Development,PetroChina)
出处
《石油机械》
北大核心
2022年第7期18-25,33,共9页
China Petroleum Machinery
基金
中国石油天然气集团有限公司科学研究与开发项目“自动闭环钻头导向和随钻探边及井下主动降温技术研究”(2021DJ4201)
中国石油集团工程技术研究院有限公司科学研究与技术开发课题“随钻仪器电路舱主动降温装置试制”(CPET202016)。
关键词
随钻仪器
井下降温系统
冷却效果
抗高温技术
被动抗温
主动降温
instrument while drilling
downhole cooling system
cooling effect
high temperature resistance technique
passive temperature resistance
active cooling
