A new orientation design model and numerical solution for coiled tubing drilling

Hu, Liang; Gao, Deli

doi:10.1016/j.jngse.2015.11.019

Cited by 2 publications

(2 citation statements)

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“…In comparison to Equation (13), the result is smaller than that calculated from the sum of the first single-stage turbine because the fluid has less energy. The method of collaborative simulation of the multi-stage turbine blades is important in predicting the performance of the turbine drill.…”

Section: Energy Transformation Modelmentioning

confidence: 79%

“…Before 2000, the conventional turbine drill size was generally greater than 5". With the increased implementation of coiled tubing technology [13], the use of small-diameter turbine drills has become a topic of increasing interest after slowly transitioning from use in oil drilling to areas of high-temperature geothermal drilling, among other applications. However, regardless of the specifications of the turbine drill, the blade design and field research have become the main aspects of research on small-diameter turbodrilling.…”

Section: Introductionmentioning

confidence: 99%

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Design and Output Performance Model of Turbodrill Blade Used in a Slim Borehole

et al. 2016

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Small-diameter turbodrills have great potential for use in slim boreholes because of their lower cost and higher efficiency when used in geothermal energy and other underground resource applications. Multistage hydraulic components consisting of stators and rotors are key aspects of turbodrills. This study aimed to develop a suitable blade that can be used under high temperature in granite formations. First, prediction models for single-and multi-stage blades were established based on Bernoulli's Equation. The design requirement of the blade for high-temperature geothermal drilling in granite was proposed. A Φ89 blade was developed based on the dimensionless parameter method and Bezier curve; the parameters of the blade, including its radial size, symotric parameters, and blade profiles, were input into ANASYS and CFX to establish a calculation model of the single-stage blade. The optimization of the blade structure of the small-diameter turbodrill enabled a multistage turbodrill model to be established and the turbodrill's overall output performance to be predicted. The results demonstrate that the design can meet the turbodrill's performance requirements and that the multistage model can effectively improve the accuracy of the prediction.

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Section: Energy Transformation Modelmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%