Specific fluid requirements for successful coiled-tubing fracturing applications

被引:0
|
作者
Cawiezel, Kay E. [1 ]
Wheeler, Richard S. [1 ]
Vaughn, David R. [1 ]
机构
[1] BJ Serv Co, Fracturing Tech Serv Grp, Tomball, TX USA
来源
SPE PRODUCTION & OPERATIONS | 2007年 / 22卷 / 01期
关键词
D O I
10.2118/86481-PA
中图分类号
TE [石油、天然气工业];
学科分类号
0820 ;
摘要
The recent success of coiled-tubing fracturing in shallow wells has increased interest in using coiled tubing for fracturing deeper and hotter wells. Industry efforts now need to focus on understanding what properties a fracturing fluid must possess to carry proppant successfully at high rates through coiled tubing, frac ports, and perforations and into these deeper formations. The key performance requirements of a coiled-tubing fracturing fluid for deeper wells are low frictional pressure loss and adequate proppant-carrying capability after exposure to high-shear zones and high temperatures. This paper summarizes the results of pilot- and field-scale testing that led to the development of an optimized coiled-tubing fracturing fluid. Results show that polymer-based fracturing fluids can be controllably delayed to have low frictional pressure loss through the curved coiled-tubing unit and straight tubing. However, results also show that fluid stability can be reduced significantly when the fluid is pumped through small-diameter tubing followed by high-shear zones such as frac ports and then by perforations. Results demonstrate that correct fluid choice and fluid optimization are required to meet proppant-transport requirements. For coiled-tubing fracturing to be successful, the fluid and treatment-design recommendations should balance frictional-pressure-loss limitations with fluid-stability limitations.
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页码:83 / 93
页数:11
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