The Sinusoidal Buckling Mechanical Analysis for the Coiled Tubing Based on Energy Method

2013 ◽  
Vol 477-478 ◽  
pp. 141-145
Author(s):  
Chun Sheng He ◽  
Ju Bao Liu ◽  
Qian Bei Yue ◽  
Yan Wang
Keyword(s):  
Energy Method ◽  
Counting Function ◽  
Fluid Pressure ◽  
Deformation Energy ◽  
Mechanical Analysis ◽  
Large Area ◽  
Coiled Tubing ◽  
Optimization Of Process Parameters ◽  
Hole Level ◽  
Sinusoidal Buckling

Columns are prone to sinusoidal buckling and repeated instability on the effect of drilling pressure and fluid pressure during drilling operation. The resulted large area of random contact to borehole wall would affect the drilling efficiency. It made the backreaming and loading hard and the drilling pressure low. Using energy method, taking flexural deformation energy and external potential energy of strings, hole section (slant hole, bending hole, level hole) and annular clearance etc. into consideration, derived the counting function of force that sinusoidal buckling occurred on coiled tubing when it contact with the wellbore, establishing the mechanical analysis method of calculating for sinusoidal buckling of slim lined construction roof bolt and string borehole. It proves an effective method for the applying of coiled tubing drilling pressure and the optimization of process parameters.

Mechanical Impact Effects of Fluid Hammer Effects on Drag Reduction of Coiled Tubing

2021 ◽  
pp. 1-10
Author(s):  
Yongsheng Liu ◽  
Xing Qin ◽  
Yuchen Sun ◽  
Zijun Dou ◽  
Jiansong Zhang ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Drag Reduction ◽  
Flow Rate ◽  
Fluid Velocity ◽  
Fluid Pressure ◽  
Great Influence ◽  
Radial Force ◽  
Fluid Flow Rate ◽  
Normal Contact ◽  
Coiled Tubing

Abstract Aiming at the oscillation drag reduction tool that improves the extension limit of coiled tubing downhole operations, the fluid hammer equation of the oscillation drag reducer is established based on the fluid hammer effect. The fluid hammer equation is solved by the asymptotic method, and the distribution of fluid pressure and flow velocity in coiled tubing with oscillation drag reducers is obtained. At the same time, the axial force and radial force of the coiled tubing caused by the fluid hammer oscillator are calculated according to the momentum theorem. The radial force will change the normal contact force of the coiled tubing which has a great influence on frictional drag. The results show that the fluid flow rate and pressure decrease stepwise from the oscillator position to the wellhead position, and the fluid flow rate and pressure will change abruptly during each valve opening and closing time. When the fluid passes through the oscillator, the unit mass fluid will generate an instantaneous axial tension due to the change in the fluid velocity, thereby converting the static friction into dynamic friction, which is conducive to the extend limit of coiled tubing.

Multi-objective optimization of process parameters involved in micro-finishing of Al/SiC MMCs by abrasive flow machining process

2016 ◽  
Vol 232 (4) ◽  
pp. 319-332 ◽  
Author(s):  
Mittal Sushil ◽  
Kumar Vinod ◽  
Kumar Harmesh
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Removal Rate ◽  
Fluid Pressure ◽  
Base Material ◽  
Machining Process ◽  
Workpiece Material ◽  
Abrasive Flow Machining ◽  
Optimization Of Process Parameters ◽  
Desirability Approach

It is hard to finish small slots in composite materials which have wide applications nowadays in aerospace, automobile and medical. Abrasive flow machining is a process that is suitable for such type of operations. In this paper, by using abrasive flow machining, investigation of SiC Metal Matrix Composites (MMCs) with aluminum as base material has been done. Material removal rate and change in surface roughness (ΔRa) are taken as response parameters. Response surface methodology has been applied to find out the effect of input parameters like fluid pressure, percentage of oil in media, grit size, concentration of abrasives, workpiece material and number of cycles on response parameters. Box–Behnken design has been preferred. Response parameters have been optimized using the desirability approach in response surface methodology. The significance of different parameters is identified using analysis of variance. An optimum combination of parameters is designed for the process. Furthermore, specimens were examined and analyzed using scanning electron microscope and X-ray diffraction techniques.

scholarly journals System to measure torsion modulus of polymers using the deformation energy method

Polímeros ◽  
2019 ◽  
Vol 29 (3) ◽  
Author(s):  
Carlos Alberto Fonzar Pintão ◽  
Lucas Pereira Piedade ◽  
Edgar Borali
Keyword(s):  
Energy Method ◽  
Deformation Energy

The Mechanical Analysis of the Coiled Tubing

2013 ◽  
Vol 385-386 ◽  
pp. 154-158
Author(s):  
Ju Bao Liu ◽  
Chun Sheng He ◽  
Qian Bei Yue
Keyword(s):  
Axial Force ◽  
Mechanical Analysis ◽  
Actual State ◽  
Contact State ◽  
Coiled Tubing ◽  
Mechanical Models

With respect to the conventional coupling thread, the coiled tubing had the advantages of without screwing on and screwing off in the lifting pipe string. It was widespread used in the drilling and repairing well. According to the actual state of the coiled tubing, the mechanical models on the ground and in the wellbore were established in this article. The were able to simulate the contact state of the coiled tubing through the drum, the guide frame, the injector head and in the wellbore. The curves of the axial force that through the rollers, guide frame, injection head and wellhead was obtained with the changes of the depth.

Prebending Coiled Tubing and Its Fatigue Life Prediction

2012 ◽  
Vol 134 (3) ◽  
Author(s):  
Li Zifeng ◽  
Li Xuejiao ◽  
Wang Peng
Keyword(s):  
Fatigue Life ◽  
Life Prediction ◽  
Interpolation Method ◽  
New Technology ◽  
High Stress ◽  
Mechanical Analysis ◽  
Fatigue Life Prediction ◽  
Oil Drilling ◽  
Coiled Tubing ◽  
Stress Cycling

Coiled tubing is widely used in oil drilling and production operations. However, extreme high stress variation of coiled tubing during the processes of pulling out, rolling in the reel, and passing through the gooseneck makes coiled tubing fatigue failure easily. Thus, it is of great importance to increase coiled tubing fatigue life. This paper introduces the new technology to improve the fatigue life of coiled tubing—the prebending coiled tubing technology; proceeds mechanical analysis and strength check of the prebending coiled tubing; analyzes stress cycling characteristics of the prebending coiled tubing in field operations; establishes the fatigue life prediction model of prebending coiled tubing under arbitrary cycle, on the basis of fatigue experimental data under the symmetric cycle and the pulsating cycle, with fitting and interpolation method; makes simple comparison of the fatigue life of the prebending coiled tubing with that of the straight coiled tubing. Preliminary calculations show that the prebending coiled tubing technology may improve the fatigue life of coiled tubing multiple times.

Heat Generation in the Railroad Bearing Thermoplastic Elastomer Suspension Element

2016 ◽  
Author(s):  
Oscar O. Rodriguez ◽  
Juan Carbone ◽  
Arturo A. Fuentes ◽  
Robert E. Jones ◽  
Constantine Tarawneh
Keyword(s):  
Cyclic Loading ◽  
Heat Generation ◽  
Thermoplastic Elastomer ◽  
Deformation Energy ◽  
Mechanical Analysis ◽  
Heat Output ◽  
Loading Frequency ◽  
Dissipation Energy ◽  
Time Frequency ◽  
Railroad Bearing

The main purpose of this ongoing study is to investigate the effect of heat generation within a railroad thermoplastic elastomer suspension element on the thermal behavior of the railroad bearing assembly. Specifically, the purpose of this project is to quantify the heat generated by cyclic loading of the elastomer suspension element as a function of load amplitude, loading frequency, and operating temperature. The contribution of the elastomer pad to the system energy balance is modeled using data from dynamic mechanical analysis (DMA) of the specific materials in use for that part. DMA is a technique that is commonly used to characterize material properties as a function of temperature, time, frequency, stress, atmosphere or a combination of these parameters. DMA tests were run on samples of pad material prepared by three different processes: injection molded coupons, transfer molded coupons, and parts machined from an actual pad. The results provided a full characterization of the elastic deformation (Energy Storage) and viscous dissipation (Energy Dissipation) behavior of the material as a function of loading frequency, and temperature. These results show that the commonly used thermoplastic elastomer does generate heat under cyclic loading, though the frequency which produces peak heat output is outside the range of common loading frequency in rail service. These results can be combined with a stress analysis and service load measurements to estimate internally generated heat and, thus, enable a refined model for the evolution of bearing temperature during operation.

First-Principles Finite Element Modeling of Coiled Tubing in Directional Wellbores

2011 ◽  
Author(s):  
Lance T. Hill ◽  
Deepak V. Datye
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
First Principles ◽  
Drill Pipe ◽  
Oil Well ◽  
Element Modeling ◽  
Coiled Tubing ◽  
Fast Running ◽  
Sinusoidal Buckling ◽  
Helical Buckling

Coiled tubing is utilized in a variety of oil well operations. For applications such as drilling, completions, and remediation, coiled tubing offers the benefits of reduced costs, increased insertion speed, and reduced environmental impact. Coiled tubing possesses a limitation, however, in that it can buckle in service causing damage to the tube and disruption of operations. There have been numerous papers published during the last 50 years on helical buckling. Numerous fast running engineering codes have been developed to determine the onset of sinusoidal buckling, helical buckling, and lock-up of drill pipe in a wellbore, with particular emphasis on coiled tubing. We provide a methodology for evaluating the complete nonlinear mechanical behavior of coiled tubing insertion from a first-principles finite element modeling perspective. Using this approach the buckling, post-buckling, and lock-up behavior of the drill pipe can be studied. Additionally, post lock-up methods such as vibration loading and downhole lubrication can also be evaluated.

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