In multidisciplinary studies carried out in the Budare Oil Field of the Great Oficina Oil Field, there was difficulty matching well log synthetic seismograms with 2D and 3D seismic data. In addition, the seismically determined depths of reservoir horizons are greater than the well sonic log depths. To examine this discrepancy we conducted an experimental study of dynamic elastic parameters of t...

the simultaneous flow of oil and water in porous media is described by relative permeability curves, mainly derived from laboratory experiments. relative permeability is of paramount importance in predicting reservoir production performance and drive mechanisms and its value depends largely on the volume fraction of fluids present in the test samples. nowadays x-ray scanners are one of the most...

Natural gas hydrate is a new clean energy source in the 21st century, which has become research point of exploration and development technology. Acoustic well logs are one most important assets studies. In this paper, an improved Carcione–Leclaire model proposed by introducing expressions frame bulk modulus, shear modulus friction coefficient between solid phases. On basis, sensitivities veloci...

With the aim of increasing momentum jet and obtaining better environmental adaptability, this study designs a new type actuator combining sparkjet combustion-driven actuator. Numerical simulation shows that has higher velocity mass rate compared to when length orifice diameter are 6.5 mm 1.3 mm, respectively, while saturation work frequency is almost same. A parameter as volume increases, press...

Spatial and velocity statistics of heavy point-like particles in incompressible, homogeneous, and isotropic three-dimensional turbulence is studied by means of direct numerical simulations at two values of the Taylor-scale Reynolds number Reλ ∼ 200 and Reλ ∼ 400, corresponding to resolutions of 512 and 2048 grid points, respectively. Particles Stokes number values range from St ≈ 0.2 to 70. Sta...

We present measurements of wind velocity and sand flux performed on the windward side of a large barchan dune in Jericoacoara, northeastern Brazil. From the measured profile, we calculate the air shear stress using an analytical approximation and treat the problem of flow separation by an heuristic model. We find that the results from this approach agree well with our field data. Moreover, usin...

1 Graduate Research Assistant, [email protected] 2 Assistant Professor, [email protected] Abstract For autonomous helicopters it is common to design a high-performance tracking controller for the attitude dynamics (innerloop) followed by a simpler, lower bandwidth design that tracks commanded position and velocity (outerloop). Separating these two designs places restrictions ...