...,1990). It was not until around the 1990s that Yew et al(1990) first combined mechanical and chemical effects to quantify mud shale stability, which centered on linking the total water content of the shale to its mechanical performance. Later, Mian C et al (1995) conducted a similar study on shales from...

... the decyl trimethyl ammonium bromide solution and crude oil changed less and stabilized in less quickly without CO 2 injection. The dynamic IFT decreased faster with pressure increase after CO 2 injection, which was favorable for crude oil emulsification and emulsion stabilization. There is a positive...

... years, with over 29 caverns built and a working gas volume of 800 million cubic meters formed. Due to the complexity of geological conditions and lack of building experience, the shape of some constructed salt cavities is irregular or even deformed, facing stability risks. Based on the geological...

... ABSTRACT Shale rock is typically anisotropic in both elasticity and strength, but traditional wellbore stability models generally assume that shale rock is isotropic or partially anisotropic, and the influence of hydraulic-mechanical coupling is usually ignored, so the effect of arbitrary...

... and cavern locations as well as multiple operations in multiple caverns on an individual cavern stability. INTRODUCTION The US Strategic Petroleum Reserve (SPR), operated by the US Department of Energy (DOE), stores crude oil in solution-mined caverns in the salt dome formations of the Gulf Coast...

... cavitation effect damage effect stability ARMA 23 366 Study on the Decomposition of Natural Gas Hydrate Induced by Cavitation Damage Haochen Huang, Yiqun Zhang*, Xiaoya Wu, Chengyu Hui, Yawen Tan & Gensheng Li State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum...

... ABSTRACT This study aims at improving our understanding on the stress field dominating the intersection between two tunnels of different diameter and hence provide insights on the stability against shear failures in this vicinity. Theoretical modeling of the deformation of rocks...

... progress and increasing the cost of the drilling operation. Conventional wellbore stability prediction relies on some deterministic physical models, involving some empirical coefficients which are difficult to determine and often dependent on field experience. In addition, some complex factors...

... ABSTRACT The increasing interest in CO 2 storage and geothermal projects leads Oil & Gas companies to develop tools and methodologies to support the operation design phase. SAFE (Stability Analysis Fault Eni) is an in-house developed code based on an analytical probabilistic approach...

... ABSTRACT This study presents a coupled poroelastodynamic model for wellbore stability analysis considering the effects of tripping operation and the flow communication between wellbore and formation. First, a transient hydraulic model is developed based on transient pressure propagation...

... on the pillar's stability factor and the width to height ratio, where the width is the smallest dimension of the rectangular base. The estimation of pillar strength in room-and-pillar stone mines has been studied by researchers and empirical relationships between traditional geometry (square and rectangular...

.... The relative distance between the bit and planned well-path was calculated by the true vertical depth (TVD). The first and second order differential equations of the offset were established as the control function. Lyapunov function was constructed not only to verify the global consistent asymptotic stability...

... and stability with a mean absolute percentage error of 1.223%. The interpretation results show that the formation pressure has short-term auto-correlation. The proposed method provides a new idea for field calculation of formation pressure, and can be a useful and high-precision scientific alternative...

... ABSTRACT Wellbore stability is often affected by the randomness and ambiguity of geomechanical parameters. Finding an effective method to analyze the borehole instability subjected to uncertainties can help improve the borehole collapse and drilling-induced tensile fracture prediction...

... ABSTRACT In well construction, well stability is needed to predict drilling time, costs, and risk management accurately. Several models have been developed in the last 60 years to estimate rock parameters and stress magnitudes from well logs. However, this involves uncertainties due to rock...

... of the roof and floor, and the plastic zone distribution. We find that the shallow-hole room-pillar method with anchor roof protection has poor pillar stability, while the filling method is more stable, lastly. Our results offer valuable insights into efficient phosphate ore mining practices and provide...

... ABSTRACT During the drilling of multilateral wells in oil and gas fields, the juncture in multilateral drilling is a high risk area for collapse. Studying the factors affecting the stability of the multilateral well juncture is helpful to improve the success rate of sidetracking in branch...

... stress-predicting model tends to predict a wider and more conservative mud density required for borehole stability in the water-sensitive shale formation. The new model enables the drilling engineer to obtain a more accurate and safe mud density window to better deal with borehole instability...

... ABSTRACT Slope failure near a reservoir area is mainly influenced by reservoir impoundment and rainfall. In this paper, a bank slope on the Lancang River near a hydropower station in Southwest China is studied. The FEM numerical model is established to investigate the deformation and stability...

... ABSTRACT Optimal stope dimensions for underground mining using the Sublevel Stoping method are selected to guarantee excavation stability. The stability graph method developed by Mathews et al. (1980) is used as an empirical tool for this purpose. The stability graph relates the stope walls...