Pressure recovery curve in the relaxation theory of filtration for a continuous spectrum of relaxation times

1997 ◽  
Vol 38 (5) ◽  
pp. 751-756
Author(s):  
O. Yu. Dinariev
Keyword(s):  
Continuous Spectrum ◽  
Relaxation Times ◽  
Pressure Recovery ◽  
Relaxation Theory ◽  
Recovery Curve ◽  
Theory Of Filtration

EFFECT OF OPERATING TIME OF THE WELLS IN THE STEADY DRAINAGE MODE BEFORE STOPPING ON THE RESULTS OF THE STUDY OF PRESSURE BUILD-UP CURVES

2017 ◽  
pp. 48-50
Author(s):  
E. F. Gilfanov
Keyword(s):  
Operating Time ◽  
Previous History ◽  
Operation Time ◽  
Pressure Recovery ◽  
Recovery Curve ◽  
History Of ◽  
Accuracy Of Results ◽  
Theoretical Pressure

Operation time of the well before stopping for investigating the pressure recovery curve in hydrodynamic studies is an important parameter affecting the quality and accuracy of results of research processing. Comparing the actual and theoretical pressure curves and the derivative, it’s possible to eliminate the uncertainty in the choice of previous history of the well operation.

NQR Relaxation Studies on Halogenomethyl Groups in Halogenoacetates

1998 ◽  
Vol 53 (6-7) ◽  
pp. 480-483 ◽  
Author(s):  
Maria Zdanowska-Fnjczek
Keyword(s):  
Room Temperature ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Effect Of Temperature ◽  
Relaxation Theory ◽  
Temperature Range ◽  
Spin Lattice ◽  
Relaxation Studies

Abstract The effect of temperature on the chlorine NQR spin-lattice relaxation times in CsH(ClH2-CCOO)2 , KH(Cl3 CCOO) 2 and N(CH3)4 H(ClF2CCOO)2 has been studied in the temperature range 77 K to room temperature. The results were discussed on the basis of NQR relaxation theory.

ON THE RELAXATION OF SUPERSTRING AXIONS

2001 ◽  
Vol 16 (14) ◽  
pp. 2595-2604 ◽  
Author(s):  
M. D. POLLOCK
Keyword(s):  
Coupling Parameter ◽  
Relaxation Times ◽  
Free Fall ◽  
Galactic Centre ◽  
Boson Stars ◽  
Superstring Theory ◽  
Relaxation Theory ◽  
Dimensionless Constant ◽  
Model Independent ◽  
Age Of The Universe

The theoretical existence of oscillating boson stars consisting of a real scalar field, stable to radial perturbations, has been proven by Seidel and Suen. For the QCD axion of the heterotic superstring theory, this implies a mini-star of mass [Formula: see text], where λ≡ fa′/fa is the ratio of the decay constants of the second and model-independent axions, which, for a suitable value in the range 1≲λ≲10, can explain the astronomical microlensing observations towards the Galactic centre and the Large and Small Magellanic Clouds. Here, we apply the non-linear relaxation theory developed by Tkachev to show that the condition τ f <τ r <τ0 for the formation of such an object, where τ f , τ r and τ0 are the free-fall and relaxation times and the age of the Universe, respectively, leads to the condition [Formula: see text], where [Formula: see text] is the strong-interaction coupling parameter and C is a dimensionless constant defined below. From this, we argue, considering the approximations involved, that the star does condense.

scholarly journals PROCESSING OF OIL WELL PRESSURE RECOVERY CURVES

2019 ◽  
pp. 18-20
Author(s):  
Abasova Inara Afrail
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Pressure Recovery ◽  
Oil Well ◽  
Recovery Curve ◽  
Recovery Curves ◽  
Reservoir Permeability ◽  
Curve Change ◽  
Industry Conditions

In the article the development of a mathematical model describing the PRC is studied on the base of pressure recovery curve method.Detailed processing of the pressure recovery curve made it possible to determine the deterioration of reservoir permeability in many wells. Here two methods are considered - stationary (steady conditions of selection) and non- stationary.The article proves that the use of these methods allows to develop a mathematical model to increase the determination of this task.On the base of numerical simulation, the following facts had impact on the results of the pressure recovery curve: well shutdown time, taking into account the initial transition section, taking into account curve change section before well shutdown.The study of variable factors impact on the results is carried out by interval estimation.The mathematical model describing the pressure recovery curve is local and changes its structures. This model can be used in industry conditions.

scholarly journals Interval Estimation of Reliability of Pressure Recovery Curve Interpretation Parameters with and without Consideration of the Transition Section

Georesursy ◽  
2014 ◽  
Vol 56 (1) ◽  
pp. 54-58
Author(s):  
V.N. Mikhaylov ◽  
◽  
M.R. Dulkarnaev ◽  
F.S. Salimov ◽  
Yu.A. Volkov ◽  
...  
Keyword(s):  
Interval Estimation ◽  
Pressure Recovery ◽  
Recovery Curve ◽  
Transition Section

scholarly journals HYDRODYNAMIC METHODS FOR THE INVESTIGATION OF WELLS AND RESERVOIR

2019 ◽  
pp. 3-8
Author(s):  
Abasova Inara
Keyword(s):  
Empirical Modeling ◽  
New Method ◽  
Pressure Recovery ◽  
Oil Reservoir ◽  
Recovery Curve ◽  
Hydrodynamic Parameters ◽  
Nonstationary Solution ◽  
Literary Sources ◽  
Proposed Model ◽  
Semi Empirical

The analysis of literary sources in this study showed that in order to solve the problem of the pressure recovery curve during hydrodynamic probe of the reservoir in the case of its constant porosity a number of studies were dedicated to the nonstationary solution of the deterministic Darcy equation for an unlimited reservoir or on methods of empirical or semi-empirical modeling for static errors, which is associated with a nontrivial approximation of the asymptotic part of the pressure recovery curve.In this study, a new method for calculating the hydrodynamic parameters of an oil reservoir is proposed, taking into account all the information from the pressure recovery curve. In contrast to the existing methods, the proposed model of pressure versus time adequately describes the entire pressure recovery curve when the well is closed, which makes it possible to fully evaluate the hydrodynamic parameters of the reservoir.

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