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Article
Experimental Investigation on Hydraulic Fracture Propagation Behaviors of Coal-Measure Thin Interbedded Rocks
Clarifying the vertical propagation mechanism of hydraulic fractures (HFs) within thin interbedded rocks can provide the fundamental insights into cross-layer behaviors of HFs and valuable guidance for designi...
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Article
Multi-step Fracturing Radial Boreholes for Efficient Development of Unconventional Gas Reservoirs
Radial borehole fracturing is a production method that combines ultrashort radius radial boreholes with hydraulic fracturing, which is expected to effectively improve the drainage and transformation effect of ...
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Article
Transport Pattern and Placement Characteristics of Proppant in Different Rough Fractures
The transport and placement characteristics of proppant in rough fracture is of great significance for optimizing fracturing parameters and making proppant transport to the deep part of fracture for effective ...
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Article
Geomechanical Properties of Thinly Interbedded Rocks Based on Micro- and Macro-Scale Measurements
Clarifying the geomechanical properties and inherent heterogeneity of layered rocks is essential for predicting fracture morphology and designing hydraulic fracturing pum** schemes. Grid nanoindentation comb...
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Article
A Comprehensive Evaluation Framework of Water-Energy-Food System Coupling Coordination in the Yellow River Basin, China
For mankind’s survival and development, water, energy, and food (WEF) are essential material guarantees. In China, however, the spatial distribution of WEF is seriously unbalanced and mismatched. Here, a colla...
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Article
The Characteristics and Laws of Fracture Damage in the Long-Term Production Process of High-Temperature Geothermal Resources
Geothermal energy is an important renewable energy source, among which hot dry rocks (HDRs) are abundant and potential. The HDRs mass is dense, so the fractures become the only flow and heat transfer channel f...
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Article
Key problems and solutions in supercritical CO2 fracturing technology
Supercritical CO2 fracturing is considered to be a new method for efficient exploitation of unconventional reservoirs, such as shale gas, coal bed methane, and tight sand stone gas. Supercritical CO2 has many spe...
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Article
Lowest Required Surface Temperature for Thermal Spallation in Granite and Sandstone Specimens: Experiments and Simulations
Thermal spallation may be economically advantageous for the drilling of deep wells and is of strong interest for the development of oil, gas and geothermal energy. The lowest required surface temperature (LRST...
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Article
Expulsive force in the development of CO2 sequestration: application of SC-CO2 jet in oil and gas extraction
With the rapid development of global economy, an increasing amount of attention has been paid to the emission of greenhouse gases, especially CO2. In recent years, dominated by the governments around the world, s...
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Article
Acoustic Emission Characteristics of Sedimentary Rocks Under High-Velocity Waterjet Im**ement
The success of waterjet drilling technology requires further insight into the rock failure mechanisms under waterjet im**ement. By combining acoustic emission (AE) sensing and underwater sound recording tech...
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Article
Open AccessA Comprehensive Model for Real Gas Transport in Shale Formations with Complex Non-planar Fracture Networks
A complex fracture network is generally generated during the hydraulic fracturing treatment in shale gas reservoirs. Numerous efforts have been made to model the flow behavior of such fracture networks. Howeve...
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Article
Rock Pore Structure Damage Due to Freeze During Liquid Nitrogen Fracturing
Liquid nitrogen has been successfully used as a fracturing fluid in petroleum engineering. When liquid nitrogen is pumped into a well, the physical conditions of the reservoir rocks will be altered. In these e...
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Article
Properties and testing of a hydraulic pulse jet and its application in offshore drilling
Offshore drilling has attracted more attention than ever before due to the increasing worldwide energy demand especially in China. High cost, long drilling cycles, and low rate of penetration (ROP) represent c...
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Article
Mechanisms and field test of solution mining by self-resonating cavitating water jets
Rapid solution mining is the key to cavern construction in salt formations. Rapid solution mining technology with self-resonating cavitating water jets is described in this paper. It can generate three main ph...
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Article
Research and application of water jet technology in well completion and stimulation in China
In recent years, rapid progress in the use of high pressure water jets (HPWJ) has been made in oil and gas well drilling, completion, and stimulation; and good results have been achieved in field applications....
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Article
Theoretical and experimental study of the pulling force of jet bits in radial drilling technology
Radial drilling technology, of which the jet bit is the key device, is a research focus in the field of oil drilling and production. This paper establishes mechanical equations for jet bits and analyzes the hy...
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Article
Numerical modeling of DPSK pressure signals and their transmission characteristics in mud channels
A numerical model and transmission characteristic analysis of DPSK (differential phase shift keying) pressure signals in mud channels is introduced. With the control logic analysis of the rotary valve mud tele...
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Article
Mechanism and numerical simulation of pressure stagnation during water jetting perforation
When perforating with an abrasive water jet, it is possible that the pressure in the hole (perforation) will be higher than that in the annulus because of water jet blasting against the hole wall, which also i...
