Development and Use of an Analytical Model to Predict Coiled Tubing Diameter Growth

1997 ◽  
Author(s):  
Paul A. Brown ◽  
Jessica L. Dickerson
Keyword(s):  
Analytical Model ◽  
Diameter Growth ◽  
Coiled Tubing

Rotation and Diameter Growth of Coiled Tubing

2018 ◽  
Author(s):  
P. E. Ken Newman ◽  
Patrick Kelleher ◽  
David Rain ◽  
Charlie Cai
Keyword(s):  
Diameter Growth ◽  
Coiled Tubing

Failure Analysis of Large-Diameter Coiled Tubing Based on Diameter Growth

2019 ◽  
Vol 142 (3) ◽  
Author(s):  
Le Zhao ◽  
Hong Zhang ◽  
Qingquan Duan ◽  
Guoping Tang
Keyword(s):  
Internal Pressure ◽  
Wall Thickness ◽  
High Pressures ◽  
Fatigue Behavior ◽  
Large Diameter ◽  
Fatigue Tests ◽  
Diameter Growth ◽  
Finite Element Software ◽  
Coiled Tubing ◽  
Bending Radius

Abstract Fatigue tests were conducted to analyze the fatigue behavior and diameter growth of large-diameter coiled tubing (CT) under the combined loads of bending and internal pressure. The experimental results reveal that mechanical limitations on the allowable diameter growth mean that the effective working life of CT at high pressures is only a fraction of the available fatigue life. The finite element software abaqus is used to further research the changes in diameter growth and to analyze the sensitivity of CT diameter growth to the main influencing factors, including internal pressure, tubing outside diameter (OD), wall thickness, yield strength, and bending radius. For CT with a diameter larger than 2 in., the diameter growth is sensitive to the above factors. As the bending and straightening cycles increase, the OD of the CT increases in association with obvious ovalization deformation, and the increase in the OD is closely related to the internal pressure load. The redistribution of material causes the wall thickness of the CT to become universally thinner. The ovality of the CT and the uneven decrease in wall thickness reduce the resistance to external extrusion. Therefore, it is becoming increasingly necessary to account for diameter growth as one of the key elements when predicting CT life or determining when to retire a string from service.

Analytical Model to Estimate the Drag Forces for Microhole Coiled Tubing Drilling

2013 ◽  
Vol 135 (3) ◽  
Author(s):  
Yuan Zhang ◽  
Ye Hao ◽  
Robello Samuel
Keyword(s):  
Analytical Model ◽  
New Technology ◽  
Drilling Process ◽  
Fluid Viscosity ◽  
Coiled Tubing ◽  
Drag Forces ◽  
Drag Models ◽  
Improved Model ◽  
Horizontal Portion ◽  
Surface Loads

Microhole coiled tubing drilling is a new technology that provides many added advantages but at the same time poses numerous operational challenges. This manifests itself in a number of ways, all of which adversely affect the efficiency of the drilling process. These problems include increased wellbore friction, poor hole-cleaning, tubular failures, and associated problems during tripping operations. Presently conventional torque and drag models are used to calculate drag forces and surface loads during microhole coiled tubing drilling. However, these estimates might be under conservative. Therefore, an improved model and more comprehensive analysis are required. Conditions expected during microhole coiled tubing drilling are completely different from those encountered during conventional drilling. Further complexity is added when the wellbore is undulated. This paper describes a new analytical model for estimating drag forces by assuming that pipe in the horizontal portion follows a sine function wave due to residual bends and snubbing force. In addition, the model takes into account when the wellbore is also tortuous. Fluid viscosity (an important force in the microhole) is also included so we can calculate appropriate surface loads in addition to drag. This study concludes that besides wellbore inclination, curvature, and wellbore torsion, parameters such as wavelength and contact area also influence the results. This paper documents the comparison between the predicted mathematical simulation results with actual data from wells describing the accuracy and applicability of the model. The analysis results and comparison are presented along with three examples (Zhang et al., 2013, “Analytical Model to Estimate the Drag Forces for Microhole Coiled Tubing Drilling,” Society of Petroleum Engineers, Paper No. SPE 163480.).

ANALYTICAL MODEL OF SUPEREXCHANGE

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-911-C8-912
Author(s):  
Yu. V. Rakitin ◽  
V. T. Kalinnikov
Keyword(s):  
Analytical Model
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