考虑滤失的页岩裂缝内支撑剂自由沉降速度计算模型  

Calculation model for proppant free settling velocity in shale fractures considering leak-off

作　　者：纪国法[1,2] 南晨阳 刘志起 赵文伟 Ji Guofa;Nan Chenyang;Liu Zhiqi;Zhao Wenwei(Cooperative Innovation Center of Unconventional Oil&Gas Ministry of Education&Hubei Province,Yangtze University,Wuhan 430100,China;Key Laboratory of Drilling&Production Engineering for Oil&Gas,Yangtze University,Wuhan 430100,China)

机构地区：[1]长江大学非常规油气省部共建协同创新中心,武汉430100 [2]长江大学油气钻采工程湖北省重点实验室,武汉430100

出　　处：《黑龙江科技大学学报》2024年第5期709-716,共8页Journal of Heilongjiang University of Science And Technology

基　　金：国家自然科学基金项目(51804042)。

摘　　要：为了研究滤失因素对支撑剂沉降速度的影响,将R-Z模型、阻力系数模型和页岩孔隙内滤失速度模型进行耦合,建立了在裂缝中受滤失影响的支撑剂沉降速度计算模型,研究黏度、孔隙半径、滑移长度和砂比对支撑剂沉降规律的影响。结果表明:随着滤失量的增加,支撑剂沉降速度在200~400 s内迅速降低;滤失会导致不同黏度下的支撑剂沉降速度发生交汇,之后黏度与沉降速度呈正相关;文中模型预测结果与前人数据相比平均误差为13.88%,验证了该模型的准确性。This paper is an attempted to investigate the influence of leak-off factors on settling velocity of proppants.The study is performed by coupling the R-Z model,the coefficient of resistance model and the leak-off velocity model in shale pores to establish a settling velocity calculation model influenced by leak-off factors in fractures,and exploring the effects of viscosity,pore radius,sliding length and sand ratio on the settling patterns of proppants.The results show that with the increase of the leak-off volume,the proppants rapidly reduce their settling velocity within 200 to 400 seconds;the settling velocity of proppants with different viscosities intersect due to leak-off,and then the viscosity and settling velocity show a positive correlation;compared with previous data,the prediction results of the model proposed have an average error of 13.88%,verifying the accuracy of the model.

关 键 词：页岩 滤失 支撑剂浓度 沉降速度 

分 类 号：TE357[石油与天然气工程—油气田开发工程]