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20 Result(s)
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Yongfa Zhang
Earth Sciences
English
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Article
Acoustic Emission Evolution and Hydraulic Fracture Morphology of Changning Shale Stressed to Failure at Different Injection Rates in the Laboratory
Hydraulic fracturing has been widely used to enhance reservoir permeability during the extraction of shale gas. As one of the external input parameters, injection rate has a significant impact on formation bre...
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Chapter
Rock Mechanics in Hydraulic Fracturing Operations
Rock, fracture and fluid mechanics are crucial elements in understanding and engineering design of hydraulic fracture treatments.
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Chapter
Fracture Initiation
Field in-situ constant-flow hydraulic fracturing test is an important technique to determine the tectonic stress field. Classical hydraulic fracturing mechanics regards the maximum tensile stress criterion as ...
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Chapter
Introduction
Compared with coal and oil, natural gas is clean and efficient, flexible in transportation and operation.
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Chapter
Reservoir Characteristics
Organic matter-rich Marine shale is mostly gray-black stone-containing carbon or silica-rich rock phase.
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Chapter
Constant Pressure Injection
In practical hydraulic fracturing, limited by the operating power of the syringe pump and long transportation of pipelines, it is often difficult to maintain high pum** fluid pressure to crack the reservoir ...
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Chapter
Fracture Propagation
In previous theories regarding hydraulic fracture propagation, it is usually assumed the fluid pressure within the hydraulic fracture is constant in the calculation of the surrounding stress field. The actual ...
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Chapter
Formation of Complex Networks
When a hydraulic fracture interacts with multiple natural fractures (such as bedding planes, faults, weak interlayers, and formation interfaces) in the formation, arrests, bifurcations, crossings, and openings...
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Chapter
Constant Flow Injection
The hydro-mechanical coupling is one of the research hotspots in the fields of petroleum, mining and tunneling engineering.
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Chapter
Fracture Interaction Behaviors
Problems arising from hydraulic fracturing involve the nonlinear coupling of rock deformation and fluid flow, the nonlocal character of the fracture elastic response, the time dependence of fracture propagatio...
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Book
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Article
Assessment of Red Bed Groundwater in the **qu Basin, Southeastern China: Its Enrichment Regularity and Emergency Exploitation Potential
Due to unbalanced spatial distribution and insufficient capacity allocation of water resources in the **qu Basin, develo** and utilizing the red bed groundwater require an effective method to address emerge...
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Article
A Semianalytical Solution for a Griffith Crack Nonuniformly Pressurized By Internal Fluid
Unintentional variations of fluid pressure within a hydraulic fracture will disturb the surrounding stress state, affect the stability of fracture propagation and complicate the fracture intersections during t...
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Article
Experimental Study on the Effects of Unloading Normal Stress on Shear Mechanical Behaviour of Sandstone Containing a Parallel Fissure Pair
To gain deeper insight into the effects of unloading normal stress on shear mechanical behaviour, laboratory tests are carried out on the red-sandstone specimens containing a parallel fissure pair under the co...
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Article
Analysis of the Pressure-Pulse Propagation in Rock: a New Approach to Simultaneously Determine Permeability, Porosity, and Adsorption Capacity
Permeability estimation from pressure-pulse decay method is complicated by two facts: (1) the decay curve often deviates from the single-exponential behavior in the early time period and (2) possible existence...
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Article
Experimental Study of Adsorption Effects on Shale Permeability
CH4 adsorption plays an important role in the permeability evolution of unconventional gas reservoirs. In this paper, an experimental method for simultaneous measurement of rock adsorption and permeability has be...
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Article
A New Criterion for a Toughness-Dominated Hydraulic Fracture Crossing a Natural Frictional Interface
Hydraulic fracturing is a powerful technology, especially in stimulating fluid production from reservoirs. However, the problem of the intersection between hydraulic fractures and natural fractures is inevitab...
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Article
Experimental characterization and dependence of rock fracture permeability on 3D stresses
The effectiveness of transmitting underground fluid in fractured rock mass is significantly influenced by stresses. This paper intends to study the hydraulic behavior of rock fractures under 3D stresses. First...
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Chapter and Conference Paper
Preparation of High-Strength Gasified Coke Used for DRI from Low Rank Coal
This paper describes attempts to produce high-strength gasified coke for the production of direct reduced iron (DRI) from low rank coal. The method involves combining modified lignite with original low rank bi...
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Chapter and Conference Paper
Gas heat carrier pyrolysis of low rank coal and associated heat transfer characteristics
A small scale gas heat carrier pyrolysis fixed-reactor (6–9 kg h−1) was established. The pyrolysis temperature and residence time effect the dehydration process, pyrolysis products, caking property, and temperatu...
