论文部分内容阅读
在建立水平井流动方程的基础上,通过气固两相流动基本数学模型的求解数值模拟不同工况条件下的气固混合物冲蚀能量,得出了冲蚀能量的变化规律。算例数值模拟显示:环空速度剖面主要由注气量大小决定,机械钻速的影响不大;相同注气量条件下,机械钻速降低与井下岩屑浓度等比例下降;注气量的增加能提高井眼净化程度,但不如降低机械钻速效果明显;环空总冲蚀能中气体冲蚀能量占绝对主要地位,岩屑冲蚀能量只占极小部分,在相同注气量条件下总冲蚀能量基本相同;岩屑冲蚀能量主要取决于机械钻速,机械钻速越大井底产生岩屑越多冲蚀能力越强,相同机械钻速条件下,较大注气量能提供较大岩屑运移速度,提高了岩屑冲蚀能量。
Based on the establishment of the horizontal well flow equation, the erosive energy of the gas-solid mixture under different working conditions was numerically simulated by solving the basic mathematical model of gas-solid two-phase flow. The numerical simulation shows that the annular velocity profile is mainly determined by the amount of gas injection and the penetration rate is not affected by the penetration rate. Under the same gas injection rate, the ratio of downhole penetration to the cuttings concentration decreases, and the gas injection rate can be increased The wellbore decontamination degree is not as good as that of reducing the penetration rate. The gas erosion energy in the total annihilation energy of the annulus occupies the absolute dominant position, and the erosion energy of the rock debris accounts for only a very small part. Under the same gas injection rate, the total erosion Energy is basically the same; lithic erosion energy mainly depends on the rate of penetration, the greater the rate of penetration Rough cuttings generated more erosion ability is stronger, the same penetration rate under the conditions of a larger gas volume can provide a larger cuttings Yun Move speed, improve cuttings erosion energy.