CAJ | 학술논문

在进行疏松砂岩水平井砾石充填完井过程中，以往均采用牛顿流体作为携砂液。泡沫流体作为非牛顿流体，比牛顿流体具有更好的携带性能，并且具有低滤失性。针对水平井砾石充填作业发生提前堵塞和携砂液进入地层问题，借鉴水平管流的固液两相流动机制，建立水平井泡沫携砾石充填两层数学模型，并且对泡沫在水平井中流动的摩阻系数进行讨论。对偏心率、砾石直径、砾石密度及泡沫干度对砾石充填效果的影响进行计算分析，并以充填效率、砂床高度及综合评价指标表征充填效果。结果表明：随偏心率增大，充填评价指标趋于增加，但增加的幅度较小；随砾石直径、砾石密度及泡沫干度的增加，充填指标趋于降低；泡沫作为携砂液进行砾石充填比牛顿流体具有更好的充填效果。
재진행소송사암수평정력석충전완정과정중，이왕균채용우돈류체작위휴사액。포말류체작위비우돈류체，비우돈류체구유경호적휴대성능，병차구유저려실성。침대수평정력석충전작업발생제전도새화휴사액진입지층문제，차감수평관류적고액량상류동궤제，건립수평정포말휴력석충전량층수학모형，병차대포말재수평정중류동적마조계수진행토론。대편심솔、력석직경、력석밀도급포말간도대력석충전효과적영향진행계산분석，병이충전효솔、사상고도급종합평개지표표정충전효과。결과표명：수편심솔증대，충전평개지표추우증가，단증가적폭도교소；수력석직경、력석밀도급포말간도적증가，충전지표추우강저；포말작위휴사액진행력석충전비우돈류체구유경호적충전효과。
Gravel packing has been an important completion method for horizontal wells in unconsolidated sand reservoirs, and Newtonian fluids were normally used as sand carrying fluid. As foam to be a non-Newtonian fluid, it has better carrying capability and low filtration. In the horizontal well gravel packing, early blockage can occur, which can limit the sand carry-ing fluid into the deep formation. In this study, a two-stage mathematical model for gravel carrying by foam fluids was estab-lished based on two-phase flow mechanism for solid-liquid flow in gravel packing process in horizontal wells. The friction fac-tor for foam flow in horizontal wellbore was considered. The influences of well's eccentricity, the size and density of gravels and the foam quality on the performance of gravel packing were investigated. A packing efficiency index, sand bed height in-dex and a comprehensive evaluation index were defined as the evaluation parameters. It is concluded that well's eccentricity has a positive effect on the performance of gravel packing, while the packing efficiency decreases with the increase of the size and density of gravels and foam quality. The gravel packing efficiency and its performance can be significantly improved in horizontal wells using foams as non-Newtonian sand carrying fluid than normal Newtonian fluids.