Flow Behavior of Fracturing Slurries in Coiled Tubing

Shah, S.N.; Zhou, Yi-fei; Goel, Naval

doi:10.2523/74811-ms

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…Meanwhile, researches on fracture initiation and extension [5] as well as theories referring to annulus injection were conducted [6][7]. During the application in horizontal well, the coordination problems on hyrajet fracturing technology and coiled tubing arise, involving coiled tubing optimum design, tubing erosive mechanism of proppant and pipe safety etc [8][9][10]. However, researches on the inner jet flow field, quantitative research and influence factor analysis on boost pressure were rarely mentioned in related researching documents.…”

Section: Introductionmentioning

confidence: 97%

Numerical Simulation of Jet Flow Field for Hydrajet Fracturing

Ren¹,

Jinzhou²,

Hu³

et al. 2010

2010 International Conference on Computational and Information Sciences

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Hydrajet fracturing is a novel stimulation technique developed in recent years, with mechanism that inner static pressure boosts by transforming flow kinetic energy into the static pressure energy resulted from the continuous flow velocity decrement after being injected into the perforation, based on the Bernoulli principle. The formation of the innerouter perforation pressure difference is the key point for the successful field application and it is important to find the relationship between the inner pressure field and outer ambient pressure as well as the influence factors. Based on the continuous medium theory and considering the high speed jet, the jet flow control equations are put forward and through the numerical simulation of inner flow field with standard k-ε twoequation model, analysis on influence factors is further conduct in this paper. It is suggested from the research results that the jetting pressure is positively correlated with boost pressure while jetting distance is negative. The higher the jetting pressure is, the more favorable for hydrajet fracturing, and the longer the jetting distance is, the more unfavorable. The outer ambient pressure is uncorrelated to the boost pressure with little influence.

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Section: Introductionmentioning

confidence: 97%

Numerical Simulation of Jet Flow Field for Hydrajet Fracturing

Ren¹,

Jinzhou²,

Hu³

et al. 2010

2010 International Conference on Computational and Information Sciences

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“…Ogugbue and Shah [12] presented the results of an experimental study carried out to investigate frictional pressure losses behavior of drag reducing polymer solutions, flowing turbulently through an eccentric annulus. Shah et al [13] and Shah [14] studied the impact of containing sand on friction pressure losses of fracturing fluid and drilling fluid. Properties of drilling fluid affected the friction pressure losses observably, it was found that drill cuttings in drilling fluid can significantly increase friction pressure losses of fluid in CT, and the higher the flow rate is, the more significantly the friction losses increase.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study of Flow Behavior of Coiled Tubing Drilling System

Guan

et al. 2014

Advances in Mechanical Engineering

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Coiled tubing drilling has become an important development direction of drilling. The method of combining theoretical calculation with the experimental verification is adopted to analyze the flow of the coiled tubing drilling system. A set of experimental bench is developed, three kinds of curvature ratio of coiled tubing are used, and the frictional pressure losses of coiled tubing and partial pressure drop of each downhole tool are tested. The results of experiments with water agree well with rough pipe calculation model. The pressure losses of coiled tube are obviously larger than that of straight tube, and the value of it is about 11-17%. The larger the curvature ratio is, the more the pressure losses of coiled tubing are. The fluid experiment with the polymer presents obviously the drag reduction effect. Experiment of simulated bottom hole assembly shows that partial pressure drop of bottom hole assembly is large. It has a little effect on the pressure losses of coiled tubing when whole bottom hole assemblies are connected. The research results can be used as the basis for formulating coiled tubing drilling process parameters, which will provide a guide for engineering practice.

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Frictional Pressure Losses of Slurries in Straight and Coiled Tubing – Part I: Model Statistical Analysis

Shaqlaih

Kamel

2014

SPE Eastern Regional Meeting

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Hydraulic fracturing has increased immensely in recent years. An accurate prediction of frictional pressure losses of fracturing slurries is crucial for successful treatment and to avoid premature screen-out or even treatment failure. Scarce data and lack of theoretical basis of slurry flow, especially in coiled tubing has led to very limited number of correlations that are available to predict slurry frictional pressure losses. Yet, the accuracy of the available correlations is still questionable. The current paper presents a statistical comparative analysis of the available frictional pressure losses correlations for slurry flow in straight and coiled tubing employing the recently introduced math modeling technique that gives weight for the models known as Akaike information criterion, AIC. With the help of AIC, the authors evaluated the available correlations to examine their accuracy. The results show that none of the available correlations can accurately predict friction pressure losses of slurries. The correlations show some reasonable accuracy within a very limited data range. However, they fail outside this range indicative of their poor applicability. AIC shows how much information is lost when using these correlations which can lead to erroneous results, and even job failure. This fact keeps the gates widely opened for more in-depth experimental, analytical, and theoretical analysis for better understanding of flow behavior of fracturing slurries aiming at developing a more realistic correlation to predict their frictional pressure losses. This paper represents the authors' first step toward developing such correlation, with the application of information theory and AIC.

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Flow Behavior of Fracturing Slurries in Coiled Tubing

Cited by 4 publications

References 5 publications

Numerical Simulation of Jet Flow Field for Hydrajet Fracturing

Numerical Simulation of Jet Flow Field for Hydrajet Fracturing

An Experimental Study of Flow Behavior of Coiled Tubing Drilling System

Frictional Pressure Losses of Slurries in Straight and Coiled Tubing – Part I: Model Statistical Analysis

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