CAJ | 학술논문

为弄清以超临界二氧化碳为钻井流体钻进水平井时的携岩机理，基于DPM模型，采用数值模拟方法对用超临界二氧化碳钻进水平井时的携岩规律进行了分析。数值模拟结果显示：水平井段环空中岩屑颗粒是分层移动的，随着岩屑向出口运移，岩屑会逐渐向水平井段下部沉降；随着排量和压力的增大、环空间隙的减小，超临界二氧化碳的携岩性能逐渐增强；而随着环空温度升高和岩屑粒径的增大，其携岩性能逐渐减弱。研究结果可为应用超临界二氧化碳钻进的水平井钻井设计提供参考。
위롱청이초림계이양화탄위찬정류체찬진수평정시적휴암궤리，기우DPM모형，채용수치모의방법대용초림계이양화탄찬진수평정시적휴암규률진행료분석。수치모의결과현시：수평정단배공중암설과립시분층이동적，수착암설향출구운이，암설회축점향수평정단하부침강；수착배량화압력적증대、배공간극적감소，초림계이양화탄적휴암성능축점증강；이수착배공온도승고화암설립경적증대，기휴암성능축점감약。연구결과가위응용초림계이양화탄찬진적수평정찬정설계제공삼고。
In order to get a better understanding on the mechanism of cuttings carrying of supercritical carbon dioxide(SC CO2 )in horizontal wells ,a numerical simulation method based on the DPM model was used to analyze the cuttings carrying law of SC CO2 in horizontal wells .The simulation results indicate that the cuttings transport in a stratified flow in horizontal section ,and the cuttings will gradually settle to the lower part of the section with the cuttings moving to the outlet ;the cuttings carrying capacity of SC CO2 will gradually increase with the increase of flow rate and pressure as well as the decrease of annular space ;but the cuttings carrying capacity will decrease gradually with the increase of temperature and cuttings size .The analysis results can provide references for the de-sign of horizontal wells drilled with SC CO2 .