On centrifugal pumps

1. Introduction to Probability 2. Conditional Probability 3. Random Variables and Distributions 4. Expectation 5. Special Distributions 6. Large Random Samples 7. Estimation 8. Sampling Distributions of Estimators 9. Testing Hypotheses 10. Categorical Data and Nonparametric Methods 11. Linear Statistical Models 12. Simulation

Probability and Statistics

A borehole-stability model that uniquely couples the mechanical and chemical aspects of drilling-fluid/shale interactions was developed. The model allows the user to determine the optimum drilling parameters (e.g., mud weight and salt concentration) to alleviate borehole-stability-related problems with oil- or water-based drilling-fluid systems. Chemically induced stress alteration based on the thermodynamics of differences in water molar free energies of the drilling fluid and shale is combined with mechanically induced stress. These two potentials are coupled by use of the framework of poroelasticity theory to formulate the physiochemical basis of this borehole-stability model

Borehole-stability model to couple the mechanics and chemistry of drilling-fluid/shale interactions

Short term load forecasting based on phase space reconstruction algorithm and bi-square kernel regression model

Review of experimental sorption studies of CO2 and CH4 in shales

A review of shale swelling by water adsorption

Experimental investigation on the mechanical properties of a low-clay shale with different adsorption times in sub-/super-critical CO2

Experimental investigation on the mechanical behaviours of a low-clay shale under water-based fluids

This study investigated the influence of temperature on the mode I fracture toughness of sandstone using semicircular bend specimens. Fracture characteristics were studied using scanning electron microscopy and other means. The results showed that temperature influenced fracturing in three stages along a temperature gradient. In the low-temperature stage (20–100 °C), fracture toughness increases slowly, with a total increase of approximately 11%. At the medium-temperature stage (100–500 °C), fracture toughness decreases slowly, at a rate of approximately 18%. During the high-temperature stage (500–800 °C), fracture toughness was reduced by approximately 44%. The mode I fracture toughness has a clear temperature threshold (500–600 °C). Below this threshold, the fracture toughness decreases slowly. When the temperature threshold is reached, the fracture toughness decreases sharply. The sharp decrease is mainly caused by the creation of a fragmentation structure. The sandstone experiences more transgranular fracture mechanics in the low-temperature stage compared to the high-temperature stage. Above 100 °C, the mechanisms include transgranular fracturing, intergranular fracturing, thermal cracking, and mutual coupling fracturing. When the temperature exceeds 500 °C, several different fragmentation structures are seen. This research study provides significant data to evaluate fracture characteristics and rock safety and stability after heat treatment.

https://link.springer.com/content/pdf/10.1007%2Fs00603-017-1226-y.pdf

Yong Kang

Papers

A review of shale swelling by water adsorption

Experimental investigation on the mechanical properties of a low-clay shale with different adsorption times in sub-/super-critical CO2

Experimental investigation on the mechanical behaviours of a low-clay shale under water-based fluids

The Influence of Temperature on Mode I Fracture Toughness and Fracture Characteristics of Sandstone

Effects of supercritical CO2 adsorption on the mechanical characteristics and failure mechanisms of shale