Abstract Wellbore instability issues represent the most critical problems in Iraq Southern fields. These problems, such as hole collapse, tight and stuck pipe result tremendous increasing nonproductive time (NPT) well costs. The present study introduced a calibrated three-dimensional mechanical earth model (3DMEM) for X-field South of Iraq. This post-drill can be used to conduct comprehensive g...

We propose a methodology to propagate uncertainties in seismic pore pressure prediction using a 3-D Probabilistic Mechanical Earth Model (P-MEM). An extended form of Bowers formula is used to link pore pressure to seismic velocity, overburden stress, porosity and clay volume. Probability Distribution Functions (PDFs) for all input variables are stored as attributes in the 3-D MEM. An output PDF...

reduction of friction in long runout landslides as an emergent phenomenon” Brandon C. Johnson, Charles S. Campbell, and H. Jay Melosh Department of Earth, Environmental and Planetary Sciences, Brown University, Providence, Rhode Island, USA, Department of Aerospace and Mechanical Engineering, University of Southern California, Los Angeles, California, USA, Department of Earth, Atmospheric, and ...

The Esfordi phosphate concentrate mainly contains fluorapatite, monazite, and xenotime as rare earth element (REE) minerals, accounting for 1.5% of rare earth metals. The monazite and xenotime minerals are refractory and their decomposition is only possible at high temperatures. Thus mechanical activation was used in the present work for this purpose. After 90 minutes of mechanical activation, ...

Accurate quantum-mechanical simulations have significantly extended the current picture of the Earth and hold a great promise for the future of the Earth and planetary sciences. Studies of phase transitions, equations of state, elasticity and thermoelastic properties of the Earth-forming minerals are essential to geophysics. This chapter gives a basic background of the physics of the deep Earth...

presented is a method of two-dimensional analysis of the active earth pressure due to simultaneous effect of both soil weight and surcharge of strip foundation. the study’s aim is to provide a rigorous solution to the problem in the framework of upper-bound theorem of limit analysis method in order to produce some design charts for calculating the lateral active earth pressure of backfill when ...