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.

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

scholarly journals An Approach to Calculating Casing Bearing Capacity with Parabolic Deformation Characteristics Under Local Radial Loading

Energies ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1769
Author(s):  
Wanchun Zhao ◽  
Jing Ge ◽  
Pathegama Gamage Ranjith ◽  
Tingting Wang ◽  
Lijie Han
Keyword(s):  
Bearing Capacity ◽  
Radial Deformation ◽  
Deformation Characteristics ◽  
Radial Load ◽  
External Work ◽  
Radial Bearing ◽  
Study Results ◽  
Casing Deformation ◽  
Radial Loading ◽  
The Impact

In the process of waterflooding technology in the Jilin oilfield, local radial compressive stress caused by rock deformation results in local casing collapse. According to statistics regarding casing-deformation characteristics, a certain number of these characteristics are approximately parabola-shaped at the radial-deformation bottom, and the boundary of the whole deformation area is approximately symmetrical and double-parabola-shaped. The main work of this article focused on occurrences of such casing deformation. Assuming that, in the process of casing deformation, external work is totally converted into energy consumption due to the deformation, the variation regularity of bearing capacity under local radial load was obtained. In the Qing-1 stratum of the Jilin oilfield, by selecting casing with radial collapse deformation parameters of 41/2″J55, 51/2″J55, 41/2″N80, and 51/2″N80, radial bearing capacity was calculated. Study results showed that the casing bearing-capacity value was reduced by 39.69% compared with the current API 5C3 standard when under the action of a local radial load. The casing collapsed due to the impact of local radial loads produced by mudstone creep. A series of relationships between radial bearing strength and casing parameters were also obtained. The research results are of significant academic value for the compilation of casing design codes or standards under local radial loading.

Numerical simulation of casing deformation during volume fracturing of horizontal shale gas wells

2019 ◽  
Vol 172 ◽  
pp. 731-742 ◽  
Author(s):  
Xueli Guo ◽  
Jun Li ◽  
Gonghui Liu ◽  
Yan Xi ◽  
Yijin Zeng ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Shale Gas ◽  
Gas Wells ◽  
Volume Fracturing ◽  
Casing Deformation

Spatial and Temporal Characteristics of Historical Oil and Gas Wells in Pennsylvania: Implications for New Shale Gas Resources

2015 ◽  
Vol 49 (20) ◽  
pp. 12015-12023 ◽  
Author(s):  
Robert M. Dilmore ◽  
James I. Sams ◽  
Deborah Glosser ◽  
Kristin M. Carter ◽  
Daniel J. Bain
Keyword(s):  
Shale Gas ◽  
Oil And Gas ◽  
Gas Wells ◽  
Temporal Characteristics ◽  
Oil And Gas Wells ◽  
Spatial And Temporal Characteristics

Application of Cable Grading Perforating Technology in the Oil Field

2013 ◽  
Vol 416-417 ◽  
pp. 2105-2109
Author(s):  
Zheng Yan Liu ◽  
Feng Zhang ◽  
Song Qiao Zhang ◽  
Xue Gui Yang ◽  
Xue Yan Wang
Keyword(s):  
Shale Gas ◽  
Oil And Gas ◽  
Horizontal Wells ◽  
Control Device ◽  
Oil Field ◽  
Gas Wells ◽  
Oil And Gas Wells ◽  
String Structure ◽  
Multi Level ◽  
Ground Monitoring

The cable grading perforating technology is a segmental perforation technology used in oil and gas wells, particularly suitable for the perforation development of shale gas horizontal wells. The cable grading perforating technology takes use of multi-level gun string structure, perforating in the three-core cable conveying way, connected the ground monitoring instrumentation, perforating gun and graded perforation initiation control device by cables, to achieve the purpose of grading perforation. This technology has practically applied in Daqing Oilfield, after several times onsite tests, obtained the success of application of the cable grading perforating technology.

Semianalytical Model for Fault Slippage Resulting from Partial Pressurization

SPE Journal ◽  
2019 ◽  
Vol 25 (03) ◽  
pp. 1489-1502 ◽  
Author(s):  
Kui Liu ◽  
Arash Dahi Taleghani ◽  
Deli Gao
Keyword(s):  
Shale Gas ◽  
Hydraulic Fracture ◽  
Fault Reactivation ◽  
Hydraulic Fractures ◽  
Gas Wells ◽  
Principal Stresses ◽  
Casing Deformation ◽  
Spacing Selection ◽  
Casing Failure

Summary Casing failure in shale gas wells has seriously impacted production from Weiyuan and Changning fields in Sichuan Province, China. Linearly distributed microseismic data and the corresponding casing shear deformation close to these microseismic signals indicate fault reactivation in these areas during hydraulic-fracturing treatments. Apparently, interaction of hydraulic fractures with nearby faults causes fault slippage, which in some situations has led to well shearing. Hence, we propose a semianalytical model in this paper to estimate the length of slippage along the fault that is caused by pressurization of a fault intercepted by the hydraulic fracture. These calculations have been performed for different configurations of the fault with respect to the hydraulic fracture and principal stresses. Using the semianalytical model provided in this paper, two fault slippage cases are calculated to assess the casing failure in nearby wells. In one case study, the calculated results of the fault slippage are consistent with the scale of casing deformation in that well and a microseismic magnitude caused by fault slippage is calculated that is larger than the detected events. The presented model will provide a tool for a quick estimation of the magnitude of fault slippage upon intersection with a hydraulic fracture, to avoid potential casing failures and obtain a more reliable spacing selection in the wells intersecting faults.

Sign in / Sign up

Export Citation Format

Share Document