CAJ | 학술논문

连续油管压裂作业过程中，压裂液除了在连续油管井下直管段流动，同时也会流入缠绕在滚筒上的那部分连续管，螺旋段的流动非常复杂，现有模型的计算结果与工程实际有一定的差距，基于流体力学基本原理，结合直管段摩擦因数公式和螺旋段几何特征，给出了连续油管螺旋段摩擦因数的一般关系式，最后经理论推导建立了完整的连续油管压裂作业管内压降的计算模型。分析了连续油管管径、滚筒直径、排量、黏度和流性指数等参数对管内压降的影响规律。结果表明：该模型的计算结果精度较高；相同条件下，螺旋段的压降总是大于直管段的压降；连续油管管径对压降的影响最大，管径增大近1倍，压降却减小了13倍，而滚筒直径对压降的影响最小，选择不同的滚筒直径，压降几乎未发生变化。
련속유관압렬작업과정중，압렬액제료재련속유관정하직관단류동，동시야회류입전요재곤통상적나부분련속관，라선단적류동비상복잡，현유모형적계산결과여공정실제유일정적차거，기우류체역학기본원리，결합직관단마찰인수공식화라선단궤하특정，급출료련속유관라선단마찰인수적일반관계식，최후경이론추도건립료완정적련속유관압렬작업관내압강적계산모형。분석료련속유관관경、곤통직경、배량、점도화류성지수등삼수대관내압강적영향규률。결과표명：해모형적계산결과정도교고；상동조건하，라선단적압강총시대우직관단적압강；련속유관관경대압강적영향최대，관경증대근1배，압강각감소료13배，이곤통직경대압강적영향최소，선택불동적곤통직경，압강궤호미발생변화。
Unlike the conventional fracturing operation, the fracturing lfuid not only lfows in straight section of downhole coiled tubing, but also lfows into the part of coiled tubing which is wound on the reel. The lfow in spiral section is very complex, and the calcula-tion results from existing model is somewhat different from the actual engineering practice, so a general relation was given to the friction factor in the spiral section of the coiled tubing based on principle of lfow mechanics and in combination with friction factor equation of the straight section and the geometric characteristics of the spiral section;ifnally a complete calculation model for internal pressure drop during fracturing operation in coiled tubing was built with theoretical derivation. Analysis was conducted of the effect law of parameters like coiled tubing diameter, drum diameter, displacement, viscosity and lfow index on internal pressure drop. The result shows that the accuracy of the calculations by this model is high;under the same conditions, the pressure drop in spiral section is always greater than that in straight section;the diameter of coiled tubing poses the greatest impact on pressure drop;when the diameter is increased by 1 time, the pressure drop reduces by 13 times, while the drum’s diameter has the smallest impact on pressure drop, so no matter what size of the drum is, the pressure drop almost remains the same.