Horizontal well of Shale Gas Complex Fracturing Casing Failure Mechanism

2019 ◽  
Vol 944 ◽  
pp. 898-902
Author(s):  
Shang Yu Yang ◽  
Jian Jun Wang ◽  
Guang Xi Liu ◽  
Li Hong Han
Keyword(s):  
Failure Mechanism ◽  
Shale Gas ◽  
Equivalent Stress ◽  
Great Influence ◽  
Distribution Law ◽  
Gas Well ◽  
Fracturing Process ◽  
Variable Function ◽  
Maximum Equivalent Stress ◽  
Casing Deformation

Shale gas well casing deformation failure is extremely serious in complex fracturing process. Based on the elastic mechanics theory, the distribution law of casing’s maximum equivalent stress field with the non uniform external extrusion is calculated by the complex variable function method. Meanwhile, casing deformation failure mechanism with non uniform external extrusion is revealed. For another, the maximum equivalent stress of the casing is analyzed with the case of a/b=2 and a/b=5. The result shows that the unevenness of the extrusion load has a great influence on the casing maximum equivalent stress distribution. The findings provide technical support for casing design and selection in complex fracturing process of shale gas well. Keywords: shale gas well; complex fracturing; casing formation; failure mechanism

Casing Bearing Capacity with Shear Load for Shale Gas Wells

2020 ◽  
Vol 993 ◽  
pp. 1190-1195
Author(s):  
Shang Yu Yang ◽  
Jian Jun Wang ◽  
Jia Wen Han ◽  
Hang Wang ◽  
Li Hong Han
Keyword(s):  
Bearing Capacity ◽  
Shale Gas ◽  
Failure Modes ◽  
Oil And Gas ◽  
Evaluation Model ◽  
Radial Deformation ◽  
Shear Load ◽  
Gas Wells ◽  
Fracturing Process ◽  
Casing Deformation

Casing radial deformation during complex fracturing process was seriously for shale gas wells in Sichuan district of China, and the average casing deformation rate in the region is of 50%. The bridge plug, perforating gun and other tools cannot successfully pass with deformed casing. Aiming at the 3-D logging morphology for deformed casing of shale gas wells, the failure modes and mechanisms were analyzed by using elasticity and theoretical mechanics. Many factors were evaluated and integrated to achieve quantitative evaluation model including geology feature, wellbore trajectory, cement property, casing material and hydrofracture process. With the aid of the self-developed unconventional oil and gas well casing simulation test equipment, the casing bearing capacity with shear load were carried out, established the relationship between shear load value and radial deformation, and further constructed the casing failure criterion with shear force. This work can provide technical support for casing design and selection in shale gas wells.

Study on Failure Mechanism of Cement Sheath Sealing of Shale Gas Well Under Alternating Loading and the Controlling Method

2019 ◽  
Author(s):  
Shiming Zhou ◽  
Rengguang Liu ◽  
Qiani Tao ◽  
Peiqing Lu ◽  
Xiaojiang Li
Keyword(s):  
Failure Mechanism ◽  
Shale Gas ◽  
Gas Well ◽  
Cement Sheath

Static Stress and Modal Analysis of the Impeller of the High-Pressure Low-Flow Pump

2011 ◽  
Vol 117-119 ◽  
pp. 430-433
Author(s):  
Bao Liang Li ◽  
Heng Feng Zhang ◽  
Zang Lei
Keyword(s):  
Modal Analysis ◽  
Equivalent Stress ◽  
Great Influence ◽  
Low Flow ◽  
Interaction Technique ◽  
Maximum Deformation ◽  
Pressure Surface ◽  
Maximum Equivalent Stress ◽  
Structure Strength ◽  
Flow Pump

Based on the design conditions,the structure strength and modal analysis are carried on the impeller by One-way Fluid-structure Interaction technique in ANSYS Workbench platform. The results show that under the water stress, the maximum deformation occurs on the brink of the blade, the maximum equivalent stress occurs at the liner near the blade pressure surface, the deformation of the blade has a great influence on the vibration of the pump.

Study on Failure Mechanism of Cement Sheath Sealing of Shale Gas Well Under Alternating Loading and the Controlling Method

2019 ◽  
Author(s):  
Shiming Zhou ◽  
Rengguang Liu ◽  
Qiani Tao ◽  
Peiqing Lu ◽  
Xiaojiang Li
Keyword(s):  
Failure Mechanism ◽  
Shale Gas ◽  
Gas Well ◽  
Cement Sheath

scholarly journals Casing failure mechanism during volume fracturing: A case study of shale gas well

2017 ◽  
Vol 9 (8) ◽  
pp. 168781401771718 ◽  
Author(s):  
Tiejun Lin ◽  
Hao Yu ◽  
Zhanghua Lian ◽  
Biao Sun
Keyword(s):  
Failure Mechanism ◽  
Shale Gas ◽  
Gas Well ◽  
Volume Fracturing ◽  
Casing Failure

Status and Influence of Shale Gas Well Integrity Failure

2019 ◽  
Vol 944 ◽  
pp. 892-897
Author(s):  
Wen Bao Zhai ◽  
Jun Li ◽  
Yan Xi ◽  
Gong Hui Liu ◽  
Ying Сao Zhou
Keyword(s):  
Failure Mechanism ◽  
Shale Gas ◽  
Structural Integrity ◽  
Oil And Gas ◽  
Gas Production ◽  
Control Methods ◽  
Gas Well ◽  
Seal Integrity ◽  
Well Integrity ◽  
At Home

The well integrity issues in oil and gas wells have a long history, especially in the shale gas development, which has a direct impact on improving single well production of shale gas horizontal wells. Reviewing the domestic and foreign literature researches, the development status of major shale gas blocks at home and abroad were introduced. Well integrity failure characteristics of major shale gas blocks at home and abroad were counted and analyzed in detail. Finally, considering the shale gas development blocks in China as an example, the structural integrity (casing deformation) and seal integrity (Sustained Casing/Annulus pressure, SCP/SAP) were analyzed by clarifying the failure mechanism that well integrity issues affected shale gas production and that shale gas well integrity issues in China are a new problem was thought. The failure mechanism of shale gas well integrity needs to be further clarified, and a complete set of failure prediction and control methods has not yet been formed. Therefore, based on the concept of shale gas geology-engineering integration, taking into account the actual conditions of shale gas development blocks, it is proposed to scientifically and reasonably study shale gas well integrity failure mechanisms and their control methods, which has a reference and guidance to improve shale gas development.

Casing Shear Deformation Analysis of Shale Gas well Based on Shale Formation Strength Reduction Method

2019 ◽  
Vol 944 ◽  
pp. 991-998
Author(s):  
Yi Jin Zeng ◽  
Jun Li ◽  
Shi Dong Ding ◽  
Zhang Xu ◽  
Wei Lian
Keyword(s):  
Rock Mass ◽  
Wall Thickness ◽  
Shale Gas ◽  
Fractured Rock ◽  
Strength Reduction ◽  
Fractured Rock Mass ◽  
Fracturing Process ◽  
Shale Formation ◽  
Cement Sheath ◽  
Casing Deformation

The problem of casing deformation caused by fault slippage due to the hydraulic fracturing process in Changning-Weiyuan area, Sichuan Province, has seriously affected the economic benefits of shale gas wells. In order to clarify the relationship between the strength of fractured rock mass, the size of fractured rock mass, and the parameters of cement sheath, based on the characteristics of artificial shale formation during hydraulic fracturing, the shale strength is reduced. The finite element model of the casing, cement sheath and formation is analyzed, and the deformation law of the casing during the shale strength reduction process is analyzed. The results show that the greater the reduction of the strength of the shale, the greater the risk of shear deformation of the casing. The fracturing height has a great influence on the casing deformation, which increases substantially linearly, and the crack width has little effect on the casing deformation. 2 The Young’s modulus of the cement sheath has little effect on the deformation of the casing, and reducing the Young’s modulus of the cement sheath cannot effectively alleviate the deformation of the casing. Increasing the wall thickness of the cement sheath increases the contact area between the cement sheath and the formation, and the degree of deformation increases. 3 increasing the wall thickness of the casing can alleviate the deformation degree of the casing, and the wall thickness of the casing should be optimized during the fracturing process. The research results have a certain guiding role for the prevention and treatment of casing deformation.

Economic benefit of shale gas exploitation based on back propagation neural network

2020 ◽  
Vol 39 (6) ◽  
pp. 8823-8830
Author(s):  
Jiafeng Li ◽  
Hui Hu ◽  
Xiang Li ◽  
Qian Jin ◽  
Tianhao Huang
Keyword(s):  
Neural Network ◽  
Shale Gas ◽  
Bp Neural Network ◽  
Large Scale ◽  
Linear Prediction ◽  
Back Propagation ◽  
Back Propagation Neural Network ◽  
Economic Benefits ◽  
Gas Well ◽  
Well Production

Under the influence of COVID-19, the economic benefits of shale gas development are greatly affected. With the large-scale development and utilization of shale gas in China, it is increasingly important to assess the economic impact of shale gas development. Therefore, this paper proposes a method for predicting the production of shale gas reservoirs, and uses back propagation (BP) neural network to nonlinearly fit reservoir reconstruction data to obtain shale gas well production forecasting models. Experiments show that compared with the traditional BP neural network, the proposed method can effectively improve the accuracy and stability of the prediction. There is a nonlinear correlation between reservoir reconstruction data and gas well production, which does not apply to traditional linear prediction methods

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