Axial Load Transfer Characteristics of SCR Pipe-in-Pipe Vibration System With Different Diameter Ratio

2016 ◽  
Author(s):  
Wenming Wang ◽  
Yingchun Chen ◽  
Haoran Li ◽  
Minghao Xiong
Keyword(s):  
Axial Load ◽  
Load Transfer ◽  
Ocean Waves ◽  
Diameter Ratio ◽  
Vibration System ◽  
External Excitation ◽  
Gas Drilling ◽  
Transfer Characteristics ◽  
Coiled Tubing ◽  
Pipe Vibration

Coiled tubing technology can shorten the operating time of offshore oil and gas drilling or repair well, but due to the small stiffness of the coiled tubing, it is easy to cause the buckling in the process of entering the Steel Catenary Riser (SCR). So the research of its axial load transfer characteristics in riser is necessary. In this paper, the external excitation loads of current and ocean waves are analyzed. By building an indoor experiment platform with similarity theory, the influence of axial load transfer characteristics with the same external excitation is studied on different diameter ratio of SCR pipe-in-pipe vibration system. Through the above research, we can reduce the accidents of the riser and coiled tubing, and provide theoretical support and guarantee to the actual operation.

Experimental study on axial load transfer behavior of a coiled tubing stuck in a steel catenary riser: At the stage of the coiled tubing un-helical buckled

2016 ◽  
Vol 231 (2) ◽  
pp. 355-363 ◽  
Author(s):  
Yingchun Chen ◽  
Shimin Zhang ◽  
Wenming Wang ◽  
Minghao Xiong ◽  
Hang Zhang
Keyword(s):  
Experimental Study ◽  
Axial Load ◽  
Load Transfer ◽  
Transfer Efficiency ◽  
Steel Catenary Riser ◽  
Coiled Tubing ◽  
Force Transfer ◽  
Safety And Reliability ◽  
Transfer Behavior ◽  
Outer Pipe

Coiled tubing can be used for steel catenary riser pigging operations to remove wax and other debris attached on the interior of steel catenary riser to recover production and ensure safety. Due to its low rigidity, coiled tubing would deform which might finally damage coiled tubing and steel catenary riser. Thus, in order to ensure safety and reliability of the operation, this article proceeded experimental study on the axial load transfer behavior of a coiled tubing stuck in a steel catenary riser when the coiled tubing has not yet helical buckled. According to the experimental results, the inner pipe’s axial force transfer efficiency is always less than 1; the outer pipe of “unfixed steel catenary riser boundary” would elongate forced by the inner pipe within it, which makes the injected displacement of inner pipe within outer pipe of “unfixed steel catenary riser boundary” bigger than the injected displacement of inner pipe within outer pipe of “fixed steel catenary riser boundary” system at the same force-out; before the inner pipe helical buckles, inner pipe’s force transfer efficiency for unfixed and fixed system can be considered as the same. The research done above might provide important theoretical supports for the steel catenary riser pigging operation.

Experimental Evaluations for the Effects of Amplitude and Frequency of Vibration on the Friction of Coiled Tubing in Hydrocarbon Drilling Operations

2014 ◽  
Author(s):  
Jamil Abdo ◽  
Idris Al-Anqoudi ◽  
Hamed Al-Sharji
Keyword(s):  
Friction Force ◽  
Axial Load ◽  
Load Transfer ◽  
Optimal Designs ◽  
Engineering Systems ◽  
Positive Effects ◽  
Coiled Tubing ◽  
Weight On Bit ◽  
Drilling Operations ◽  
Helical Configuration

In a hydrocarbon drilling operations, when an axial load is applied beyond a critical value the coiled tubing (CT) will buckle forming sinusoidal wave and with increasing the axial load the CT ultimately goes into a helical configuration. The higher number of contacts between the CT and the wellbore the more friction is introduced. Increasing the CT friction, due to increasing the area of contact with the wellbore, eventually leads to lock-up length beyond which the drilling cannot proceed further. Vibration is understood to be a well-known technique to reduce friction between contacting bodies in many engineering systems. An in-house experimental setup is developed to imitate the wellbore being drilled with the presence of vibrating facility that has the capability to vibrate the CT axially. The setup is employed to examine the effects of amplitude and frequency of vibration on the friction force, between the CT and the wellbore, and on the axial load transfer or the weight on bit (WOB) of the CT. Response surface methodology is used to produce a prediction model to determine the effects of various amplitudes and frequencies the WOB of the CT. The investigations have shown that both amplitude and frequency of vibration have positive effects on reducing friction force and increasing WOB. The actual and predicted optimal designs are also presented in this work.

Mandibular Implant-Supported Overdenture: An In Vitro Comparison of Ball, Bar, and Magnetic Attachments

2013 ◽  
Vol 39 (3) ◽  
pp. 302-307 ◽  
Author(s):  
V. Manju ◽  
T. Sreelal
Keyword(s):  
Stress Distribution ◽  
Strain Gauge ◽  
Load Transfer ◽  
Implant Surface ◽  
Transfer Characteristics ◽  
Ball Bar ◽  
Different Types ◽  
Dial Gauge ◽  
In Vitro Comparison

In an implant-supported overdenture, the optimal stress distribution on the implants and least denture displacement is desirable. This study compares the load transfer characteristics to the implant and the movement of overdenture among 3 different types of attachments (ball-ring, bar-clip, and magnetic). Stress on the implant surface was measured using the strain-gauge technique and denture displacement by dial gauge. The ball/O-ring produces the optimal stress on the implant body and promotes denture stability.

Experimental Study of the Rotary Filling Piles with Large-Diameter under the Axial Load

2012 ◽  
Vol 594-597 ◽  
pp. 527-531
Author(s):  
Wan Qing Zhou ◽  
Shun Pei Ouyang
Keyword(s):  
Experimental Study ◽  
Axial Load ◽  
Load Transfer ◽  
Soft Soil ◽  
Large Diameter ◽  
Shaft Resistance ◽  
Tip Resistance ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Deep Soft Soil

Based on the experimental study of rotary filling piles with large diameter subjected to axial load in deep soft soil, the bearing capacity behavior and load transfer mechanism were discussed. Results show that in deep soft soil foundation, the super–long piles behave as end-bearing frictional piles. The exertion of the shaft resistance is not synchronized. The upper layer of soil is exerted prior to the lower part of soil. Meanwhile, the exertion of shaft resistance is prior to the tip resistance. For the different soil and the different depth of the same layer of soil, shaft resistance is different.

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