Article
Energy & Fuels
Shangyu Yang, Lihong Han, Jianjun Wang, Hang Wang, Xingru Wu
Summary: This study focuses on casing deformation and failure issues in shale gas development in the Sichuan-Chongqing region of China, categorizing casing failure modes and mechanisms and proposing a strain-based casing design approach. Experimental data provided critical information for improving production efficiency and reducing economic losses.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Chemical
Yanchao Li, Jianguo Shen, Longqing Zou, Yushi Zou, Xinfang Ma, Can Yang, Weiwei Wang
Summary: This study conducted simulation experiments to investigate the temporary plugging and diversion fracturing (TPDF) technique in a horizontal well with multiple clusters. A method of inner-fracture + inner-segment TPDF with multiple clusters of perforation in horizontal wells was proposed, and the influence of the number of clusters and the method of perforating on the effectiveness of TPDF was studied. The results showed that higher peak pressures and increased complexity of hydraulic fractures were observed when the number of perforation clusters was five.
Article
Engineering, Chemical
Yisheng Mou, Jian Cui, Jianjun Wu, Fengqi Wei, Ming Tian, Lihong Han
Summary: This paper qualitatively and quantitatively analyzes the relationship between casing buckling and casing deformation before hydraulic fracturing (CDBF) based on the theory of tubular mechanics. The mechanism of CDBF is systematically analyzed using field data and finite element method. Mitigation measures are proposed based on the analysis results, providing a theoretical basis and reference for shale gas well application.
Article
Engineering, Mechanical
Peng-Fei Yin, Sheng-Qi Yang, Feng Gao, Wen-Ling Tian, Wei Zeng
Summary: Understanding the distribution characteristics of hydraulic fracture networks in shale reservoirs is crucial for optimizing fracturing design and production estimation. By improving the fluid-solid coupling model and studying key factors affecting fracture propagation, a numerical model is established to analyze the distribution characteristics of the fracture network in staged fracturing. The results show that coalescence of interbedding fractures plays a significant role in forming an effective fracture network for shale gas exploitation.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Energy & Fuels
Lu Qianli, Liu Zhuang, Guo Jianchun, He Le, Li Yanchao, Zeng Ji, Ren Shan
Summary: This study examines the factors affecting casing deformation (CD) in shale gas well fracturing caused by natural fracture slip, revealing the influence of fracture and wellbore approach angles, fluid pressure, fracture length, and other factors on CD. Adjusting the wellbore approach angle and controlling fluid pressure in the fracture can help reduce CD risk, while increasing casing strength or cementing quality has limited effect. The CD prediction model has been verified by caliper logging data, providing a reliable method for quick CD risk prediction in fracturing design.
PETROLEUM EXPLORATION AND DEVELOPMENT
(2021)
Article
Energy & Fuels
Lei Qun, Xu Yun, Cai Bo, Guan Baoshan, Wang Xin, Bi Guoqiang, Li Hui, L. Shuai, Ding Bin, Fu Haifeng, Tong Zheng, Li Tao, Zhang Haoyu
Summary: This article systematically summarizes the horizontal well fracturing technology for shale oil and gas reservoirs abroad since the 13th Five-Year Plan, and elaborates on new features in 3D development of stacked shale reservoirs, small well spacing and dense well pattern, horizontal well re-fracturing, fracturing parameters optimization and cost control. Based on the requirements for horizontal well fracturing technology in China, the technological progress in multi-fracture propagation simulation, horizontal well frac-design, electric-drive fracturing equipment, soluble tools and low-cost downhole materials, and factory-like operation are summarized. The article also suggests strengthening research and development in seven aspects for the 14th Five-Year Plan.
PETROLEUM EXPLORATION AND DEVELOPMENT
(2022)
Article
Engineering, Chemical
Bihua Xu, Shuo Yang, Bin Yuan, Lu Ma, Leding Wang
Summary: Casing deformation caused by fault and fracture sliding during fracturing is a growing concern, especially in the shale gas blocks of Changning-Weiyuan-Zhaotong. Shear deformation is the dominant form, and factors such as weakened casing strength, geological factors, cement quality, and fracturing engineering contribute to casing deformation. Optimizing well trajectory, improving casing strength and cementing quality, or optimizing fracturing operation can help reduce casing deformation.
Article
Multidisciplinary Sciences
Yijin Zeng, Kui Liu, Shiming Zhou, Qian Tao, Guangguo Yang, Jinlong Du
Summary: This study investigates the casing deformation problem caused by hydraulic fracturing treatments and analyzes the mechanism and methods for controlling this problem. The results show that shear deformation is the main type of casing deformation in the Weirong shale gas field, China. The reactivation and slip of natural fractures in the shale gas formation are identified as the main causes of deformation. The study also proposes effective methods for controlling casing deformation in shale gas wells.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Wan Cheng, Chunhua Lu, Bo Xiao
Summary: The study introduced a coupled three-dimensional fracture model for simulating intensive-stage fracturing in horizontal wells. Results indicated that designing more perforation numbers and larger diameters in the interior perforation cluster can improve the fracture geometry equilibrium in intensive-stage fracturing.
Article
Engineering, Ocean
Xiaolong Ma, Youhong Sun, Wei Guo, Rui Jia, Bing Li
Summary: The research found that a 5-meter horizontal fracture length in the hydrate reservoir significantly increased gas production when the horizontal well was located in different areas within the gas hydrate-bearing layer. Increasing the fracture length from 5 to 20 meters only slightly increased gas production. Additionally, the promotion effects of horizontal fractures on gas production varied based on the location of the horizontal well within the reservoir.
APPLIED OCEAN RESEARCH
(2021)
Article
Energy & Fuels
Jinzhou Zhao, Zhenhua Wang, Ran Lin, Lan Ren, Jianfa Wu, Jianjun Wu
Summary: Hydraulic fractures in shale reservoirs exhibit non-uniform propagation behavior, which significantly limits hydraulic fracturing performance. Currently, the implementation of pumping diversion balls to restrain overextended fractures and promote restricted fractures has been used, but it is limited by theoretical simulation and blind implementation. In this study, a dynamic propagation model for multiple-cluster hydraulic fractures was established to simulate the dynamic propagation of fractures after pumping diversion balls. The simulation method developed in this study has important theoretical significance and field application value in guiding the regulation of uniform expansion of fractures and improving the optimization of diverting fracturing design.
JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME
(2023)
Article
Energy & Fuels
Pengwei Zhang, Xing Liang, Chenggang Xian, Baoguo Liu, Weixu Wang, Chao Zhang
Summary: Unconventional geomechanics is studied in the context of shale gas development, with a focus on mitigating drilling risk and optimizing hydraulic fracturing processes. In the Yichang shale gas reservoir, the challenge of low gas production rate after hydraulic fracturing is addressed through a comprehensive 3D geomechanics model that considers shale anisotropy and spatial heterogeneity. The model is validated with field data and used to analyze the stress barrier and hydraulic fracturing effects in the reservoir.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2022)
Article
Engineering, Chemical
Wei Lian, Jiayi Liu, Yu He, Xiaobo Chen, Jun Li, Yunfeng Zhao, Yanxian Wu
Summary: This study investigated the distribution characteristics and causes of casing deformation during hydraulic fracturing. Finite element models were established to consider a multi-stage fracturing process. The axial displacement law of the formation and the mechanism of casing deformation caused by fault slippage were analyzed. The results revealed that casing deformation is densely located near landing point A and sparsely located near toe point C.
Article
Energy & Fuels
Yongxue Lin, Shanyong Liu, Shuyang Gao, Yuan Yuan, Jia Wang, Siqi Xia
Summary: This study evaluated the stimulation effect of fracturing technology and proposed an optimal design method of volume fracturing for shale gas based on the evaluation of the frac effects. Case studies showed that optimizing the design can increase production.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2021)
Article
Energy & Fuels
Fang Shi
Summary: It is of great significance to predict the production rate and estimate the ultimate recovery for the optimization of shale gas development. A novel approach using XFEM is proposed to simulate the processes of hydraulic fracturing and gas production, revealing that proppant size has a dominant influence on gas production, followed by proppant concentration, shale formation viscosity, proppant Young's modulus, and shale formation Young's modulus.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)