Settling behavior of spherical particles in fiber-containing drilling fluids

被引:50
作者
Elgaddafi, Rida [1 ]
Ahmed, Ramadan [1 ]
George, Matthew [1 ]
Growcock, Fred [2 ]
机构
[1] Univ Oklahoma, Sarkeys Energy Ctr, Norman, OK 73019 USA
[2] M I SWACO, Houston, TX 77072 USA
关键词
settling; fiber suspensions; drag force; spherical particles; solids transport; sweep fluid; DRAG COEFFICIENT; VELOCITY; SUSPENSIONS; RHEOLOGY; MODEL;
D O I
10.1016/j.petrol.2012.01.020
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Fiber-containing fluids are utilized in many industrial applications. In the petroleum industry, fiber suspensions are used to transport rock cuttings from the bottom of the hole to the surface. Moreover, fibrous fluids are applied in fracturing operations to transport proppant particles to the fractured space. Solids transport performance of these fluids largely depends on the settling behavior of suspended particles. This article presents results of experimental and theoretical investigations conducted on the settling behavior of 2 to 8 mm spherical particles in fiber-containing fluids. Experiments were carried out in a 2-m long and 100-mm diameter transparent cylinder. Both Newtonian and non-Newtonian fluids were tested. A moving digital camera system was used to track a particle while it settled. The camera records were used to determine the settling velocity of each particle as a function of time. Fiber concentration was varied from 0.00% to 0.08% by weight. When a particle settles in the fibrous fluid, it experiences fiber drag in addition to conventional hydrodynamic resistance, i.e. viscous drag. Measured terminal velocity was used to compute the viscous component of the total drag. Subsequently, applying the momentum balance, the fiber drag component acting on the particle was determined from the total drag. Results show that the fiber drag is a function of the particle's projected area, settling velocity, fiber drag coefficient, and density difference between the fluid and particle. Using experimental data, a semi-empirical model was developed to predict terminal settling velocity of a particle in fiber-containing fluids. The correlation is valid for both Newtonian and non-Newtonian base fluids that have low concentrations of fully dispersed fibers with a length and diameter of 10 mm and 100 mu m, respectively. (C) 2012 Elsevier B.V. All rights reserved.
引用
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页码:20 / 28
页数:9
相关论文
共 32 条
[1]  
Abdolnabi H., 2004, SPE ANN TECHN C EXH
[2]  
Ahmed R.M., 2008, SPE ICOTA COIL TUB W
[3]   Settling velocity of sediments at high concentrations [J].
Baldock, TE ;
Tomkins, MR ;
Nielsen, P ;
Hughes, MG .
COASTAL ENGINEERING, 2004, 51 (01) :91-100
[4]  
Bivins C., 2005, Oilfield Review, V17
[5]  
Bulgachev R., 2006, SPE RUSS OIL GAS TEC
[6]  
Cameron C., 2003, Middle East Oil Show, DOI [10.2118/81419-MS, DOI 10.2118/81419-MS]
[7]  
Chhabra RP, 2007, CHEM IND-SER, V113
[8]  
Chhabra R.P., 1980, THESIS MONASH U MELB
[9]   A note on wall effect on the terminal falling velocity of a sphere in quiescent Newtonian media in cylindrical tubes [J].
Chhabra, RP ;
Agarwal, S ;
Chaudhary, K .
POWDER TECHNOLOGY, 2003, 129 (1-3) :53-58
[10]   SIMPLE METHOD FOR THE ESTIMATION OF FREE-FALL VELOCITY OF SPHERICAL-PARTICLES IN POWER LAW LIQUIDS [J].
CHHABRA, RP ;
PERI, SS .
POWDER TECHNOLOGY, 1991, 67 (03) :287-290