scholarly journals Toxicological and chemical studies of wastewater from hydraulic fracture and conventional shale gas wells

2018 ◽  
Vol 37 (8) ◽  
pp. 2098-2111 ◽  
Author(s):  
L.M. Crosby ◽  
Calin A. Tatu ◽  
Matthew Varonka ◽  
Kaylene M. Charles ◽  
William H. Orem
Keyword(s):  
Shale Gas ◽  
Hydraulic Fracture ◽  
Gas Wells ◽  
Chemical Studies

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.

A Methodology to Quantify the Volume-of-investigation in DFIT Design for Shale Gas Wells

2019 ◽  
Author(s):  
Zhiming Chen ◽  
Hongyang Chu ◽  
Xuefeng Tang ◽  
Lingyu Mu ◽  
Peng Dong ◽  
...  
Keyword(s):  
Shale Gas ◽  
Gas Wells

scholarly journals Integrity tests of cement sheath for shale gas wells under strong alternating thermal loads

2020 ◽  
Vol 7 (6) ◽  
pp. 671-679
Author(s):  
Yuanhua Lin ◽  
Kuanhai Deng ◽  
Hao Yi ◽  
Dezhi Zeng ◽  
Liang Tang ◽  
...  
Keyword(s):  
Shale Gas ◽  
Thermal Loads ◽  
Gas Wells ◽  
Cement Sheath ◽  
Integrity Tests
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