Calculation and prediction of casing collapse strength based on a new yield strength acquisition method

2021 ◽  
pp. 104149
Author(s):  
C. Zachary ◽  
O. Bello ◽  
C. Teodoriu
Keyword(s):  
Yield Strength ◽  
Collapse Strength ◽  
Strength Based ◽  
Acquisition Method ◽  
Casing Collapse

Analysis on the Influence Factors of Casing Collapse Resistance Strength

2011 ◽  
Vol 415-417 ◽  
pp. 2121-2125 ◽  
Author(s):  
Qi Lou ◽  
Wei Du ◽  
Xin Li Han ◽  
Dong Feng Li ◽  
Guang Lu Zhang
Keyword(s):  
Residual Stress ◽  
Yield Strength ◽  
Material Properties ◽  
Influence Factors ◽  
Full Scale ◽  
Test Results ◽  
Resistance Property ◽  
Collapse Resistance ◽  
Strength Based ◽  
Casing Collapse

Casing collapse resistance strength is an important parameter for its properties in using. Specification, geometry accuracy, material properties, and many other reasons can influence casing collapse resistance property. Study each factors influence for casing collapse resistance strength based on full scale collapse test results of seventeen Φ177.80mm casings and there geometry and material properties test results. The results show that casing collapse resistance strength was influenced by geometry accuracy, yield strength and residual stress together. Ovality greater than 0.5% and fluctuated more than 0.5%, or eccentricity more than 10%, casing collapse resistance strength will be reduced obviously. Casing with excellent collapse resistance strength will be produced through making yield strength in appropriate level, controlling the geometry accuracy and reducing residual stress.

Examination of Commercial Casing Collapse Strength Under Axial Loading

1982 ◽  
Vol 104 (4) ◽  
pp. 343-348 ◽  
Author(s):  
T. Tamano ◽  
Y. Inoue ◽  
H. Mimura ◽  
S. Yanagimoto
Keyword(s):  
Axial Load ◽  
Axial Stress ◽  
Axial Loading ◽  
External Pressure ◽  
Plastic Collapse ◽  
Slight Effect ◽  
Collapse Pressure ◽  
Minimum Value ◽  
Collapse Strength ◽  
Casing Collapse

Collapse testing of commercial API grade 7-in. casing was conducted under combined external pressure and axial load. The measured collapse pressure was considerably higher than the API minimum value, especially for the large D/t ratio, as expected. For the casings of large D/t ratio, the measured collapse pressure was a little smaller than the theoretical value for ideal pipe and the axial stress had a slight effect on the collapse pressure. In the range of plastic collapse, the measured collapse pressure was not less than the yield pressure for ideal pipe except near the boundary of the elastic and plastic collapse ranges.

scholarly journals Casing Collapse Strength Analysis under Nonuniform Loading Using Experimental and Numerical Approach

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Dongfeng Li ◽  
Fu Yu ◽  
Heng Fan ◽  
Rui Wang ◽  
Shangyu Yang ◽  
...  
Keyword(s):  
Shale Gas ◽  
In Situ Stress ◽  
Strength Analysis ◽  
Collapse Strength ◽  
Diameter Variation ◽  
Nonuniform Loading ◽  
Variation Rate ◽  
Casing Deformation ◽  
Casing Collapse

Multistage fracturing is the main means of shale gas development, and casing deformation frequently occurs during fracturing of shale gas horizontal wells. Fracturing fluid entering the formation will change in situ stress nearby the wellbore. The changes of in situ stress are mainly reflected in the following two aspects: one is the increase of in situ stress and the other is the nonuniformity of in situ stress along the wellbore. And it is for this reason that the production casing is more likely to collapse under the nonuniform in situ stress load. According to the service conditions of production casing in shale gas reservoir, this paper studied the casing deformation and the collapsing strength subjected to the nonuniform loading by the experimental and numerical simulation method. The results show that under the condition of nonuniform loading, (1) the diameter variation rate of the casing reduces with the increase in the ratio of sample to tooling length. When the ratio is less than 3, the casing collapse strength will be significantly reduced. And when the ratio is greater than 6, the impact of sample length on casing collapse strength can be ignored. (2) The increase in the applied loading angle will decrease the diameter variation rate. When the loading angle increases from 0° to 90°, the critical load value increases from 1600 kN to 4000 kN. (3) The increase in load unevenness coefficient will rapidly decrease the casing collapse strength. When the load unevenness coefficient n is 0.8, the casing collapse strength reduces to 60%, and when the load unevenness coefficient n is 0, the casing collapse strength reduces to 28%. The findings of this study can help for better understanding of casing damage mechanism in volume fracturing of shale gas horizontal well and guide the selection of multistage fracturing casing type and fracturing interval design.

scholarly journals A Fast Identification Method of Yield Strength of Materials Based on Bending Experimental Data

Metals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 169
Author(s):  
Yongchuan Duan ◽  
Le Tian ◽  
Fangfang Zhang ◽  
Haidi Qiao ◽  
Muyu Li ◽  
...  
Keyword(s):  
Experimental Data ◽  
Yield Strength ◽  
Average Error ◽  
Prediction Errors ◽  
Relevant Model ◽  
Strength Of Materials ◽  
Vector Method ◽  
Yield Load ◽  
Strength Based ◽  
The One

Identifying the yield strength of materials quickly and accurately is the key to realizing defect prediction and digital process control on the production line. This paper focuses on identifying the material yield strength based on bending deformation, analyzing the influence of different die fillets, punch fillets, and die spans on the curve shapes, determining the reasonable dimensions of the device, and developing them. Two methods for rapidly extracting the yield load are proposed—the window vector method (WV) and the fitting residual method (FR)—and compared with the double secant line method (CWA) and the one tenth thickness method (t/10). Because there is no direct correspondence between the yield load and the material performance parameters, the relevant equations were fitted using the experimental data. The linear correlation between load and yield strength determined by these four methods was close to 0.99. Finally, four kinds of sheets with high, medium and low yield strength were tested and compared with the observed results. The result shows that when the yield strength is small, the average error and the relevant model dispersion will increase. As the yield strength increases, the biases increase gradually. The prediction errors based on the t/10, WV, and FR methods were all below 4%.

Enhancement of Collapse Resistance of UOE Pipe Based on Systematic Exploitation of Thermal Cycle of Coating Process

2008 ◽  
Author(s):  
Andreas Liessem ◽  
Johannes Groß-Weege ◽  
Steffen Zimmermann ◽  
Gerhard Knauf
Keyword(s):  
Plastic Deformation ◽  
Thermal Treatment ◽  
Yield Strength ◽  
Thermal Cycle ◽  
Compressive Yield Strength ◽  
Coating Process ◽  
Cold Plastic Deformation ◽  
Production Route ◽  
Collapse Strength ◽  
Collapse Resistance

The present paper discusses recent results of an ongoing study on the effect of thermal treatment on collapse strength of cold formed pipes, for instance those following the UOE production route. It has been recognized that thermal treatment as encountered during thermal cycle of pipe coating processes may compensate the reduction of compressive yield strength owing to cold plastic deformation induced during forming. This effect has been systematically analyzed. Enhancement of collapse resistance exploiting the thermal cycle of coating process was studied based on experimental evidence, Finite Element simulations as well as theoretical analysis. It is herein shown that appropriate thermal treatment manifests itself positively with respect to compressive yield strength, leading to significantly improved collapse pressures. As a result fabrication factors of one and even higher may be applicable.

Effect of Wear and Bending on Casing Collapse Strength

1992 ◽  
Author(s):  
Yukihisa Kuriyama ◽  
Yasushi Tsukano ◽  
Toshitaro Mimaki ◽  
Tetsuo Yonezawa
Keyword(s):  
Collapse Strength ◽  
Casing Collapse

scholarly journals Influence of Volume Fracturing on Casing Stress in Horizontal Wells

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2057
Author(s):  
Jingpeng Wang ◽  
Youming Xiong ◽  
Zongyu Lu ◽  
Jiangang Shi ◽  
Jiwei Wu
Keyword(s):  
Temperature Effect ◽  
Temperature Change ◽  
Temperature Stress ◽  
Horizontal Wells ◽  
Wellhead Pressure ◽  
Collapse Strength ◽  
Fracturing Process ◽  
Casing Strength ◽  
Volume Fracturing ◽  
Casing Collapse

In horizontal wells, the casing string is affected by the gravity effect, temperature effect, swelling effect, bending effect, friction effect and other mechanical effects. In view of this situation, the mathematical models of casing swelling effect and temperature effect caused by volume fracturing are established. The case analysis shows that the length of the unsealed section in the vertical section has a great influence on the axial shortening of the casing during fracturing. With the increase of the unsealed section length, the axial shortening of the casing increases gradually under the same wellhead pressure. In the process of fracturing, repeated squeezing and pressurization lead to periodic changes of the wellhead pressure, casing deformation and load, which leads to fatigue damage and even fracture of casing. At the same time, a large amount of fracturing fluid is continuously injected through the casing during the fracturing process, which makes the wellbore temperature change greatly. The additional stress caused by the temperature change reduces the casing strength, which has an important impact on the wellbore integrity. The mathematical model of temperature stress and its effect on the casing strength during volume fracturing is established. With the increase of the temperature stress acting on the casing, the casing collapse strength decreases gradually. When the temperature stress reaches 200 MPa, the casing collapse strength decreases to 84% of the original. The research results can provide a reference for the casing integrity design and control in the horizontal well fracturing process.

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