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| Oil and Gas Business. Electronic Scientific journal. Issue 1/2004 (the first half-year of 2004) |
25.06.04, Z.Z. Sharafutdinov, R.Z. Sharafutdinova
WATER-BAZE MUDS AND CONTROL OF RHEOLOGICAL PROPERTIES THEREOF
http://www.ogbus.ru/authors/Sharafutdinov/Sharafutdinov_2.pdf (in Russian)
A significant part in solving these problems is played by reological properties of drilling muds used in well construction. Analysis of drilling mud reological properties from standpoint of classical mechanics does not call for considering discreteness of their liquids at the level of suspension and constituon of the liquid itself, and does consider the properties of inter-particle forces acting inside them. All this impedes solution of technological problems in well construction.
The paper reviews the influence of nature of water behavior in drilling mud, chemical composition and thermodynamics properties of reagents on reological properties of drilling muds. Described are the basic ways of the rheological properties control.
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18.06.04, Z.Z. Sharafutdinov
WATER, ITS INFLUENCE ON PHYSICAL AND MECHANICAL PROPERTIES OF CLAY AND ARGILLIFEROUS ROCK
http://www.ogbus.ru/authors/Sharafutdinov/Sharafutdinov_1.pdf (in Russian)
Clay is an extremely hydrophilic material. It is always saturated with water, however water quantity and state depend on thermodynamic conditions of clay existence. Depending on state of water in clay, its physical and mechanical properties vary within a wide range. It affects the features of clay behavior in case of deep occurrence.
There is an opinion that depending on the ground pressure, hydrate water can exercise properties of metals. Metallization of hydrate bonding with pressure increase occurs smoothly, and its recovery to the initial atomic condition will happen discretely, by jumping. Therefore, for example, opening-out during clay drilling, with water that acquired metal properties, can result in occurrence of absolutely new phenomena. First of all, metallization of water properties applies corrections to clay properties through pore pressure. In course of drilling, the influence of ground pressure is removed from clay; therefore bonds recovery from metallic to atomic condition takes place in water. It manifests itself in the well, as a sharp increase is slough and rockslide with lifting a big amount of cuttings in the form of needle-like, arrow-type and scaly solid particles.
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21.04.04, Lyagov À.V. etc.
EXPERIMENTAL COILED TUBING DRILLING OF HORIZONTAL WELL WITH THE RUSSIAN EQUIPMENT AND TOOLS IN ANK "BASHNEFT"
http://www.ogbus.ru/authors/Lyagov/Lyagov_1.pdf (in russian)
In paper tells about the first results of the experimental drilling on depression of a horizontal well at ANK "Bashneft", with the help of a coiled tubing complex produced by domestic companies. The experiments with the coiled tubing devices working at the bottom-hole assembly (BHA) on aerated fluid have demonstrated their work capacity and possibility to control the pathway during the drilling process. The performance parameters and the indispensable technological modes of exploitation of a coiled tubing complex have been experimentally selected.
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20.04.04, S.B. Sapojnikov, M.V. Forental
USING ANSYS (DESIGNSPACE 7.0) AND ALGOR (V.13.24) FOR STRUCTURE OPTIMIZATION OF HYDRAULIC CYLINDER HOUSING
http://www.ogbus.ru/authors/Forental/Forental_2.pdf (in russian)
ANSYS (DesignSpace 7.0) and ALGOR (v.13.24) were used for structure optimization of hydraulic cylinder housing. The calculation of stress-strain state under working loads for the determination of possibility of removing an unloaded material was described. It was also shown the plastic deformation of metal part in places of external winding by carbon fiber reinforcing material (CFRP) for the making a favourable distribution of residual stresses after previous overloading.
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14.04.04, Lakatos I., Lakatos-Szabo J., Bauer K.,Palasthy Gy., Puskas S.
INJECTION OF LEAN GAS INTO AN ULTRALIGHT OIL BEARING RESERVOIR: INTERFACIAL ASPECTS
http://www.ogbus.ru/eng/authors/Lakatos/Lakatos_3.pdf
Application of lean gases, particularly a methane rich gas, nitrogen, carbon dioxide, air and their mixtures in an ultra light oil bearing reservoir located in Southern Hungary, is in an advanced stage. The relevant studies and mathematical simulations have definitely indicated a substantial surplus oil production and it was also revealed that gravity segregation and vaporization of light hydrocarbons were the main elements of the displacement mechanism. However, well founded arguments have arisen about anomalous interfacial phenomena and precipitation of some oil constituents during the recovery process since the oil was strongly paraffinic and the predicted vaporization was high.
Therefore, a detailed laboratory study was commenced to determine the effect of nitrogen, carbon dioxide and lean methane on surface and interfacial properties. On the basis of the experimental results, it was concluded that the well known surface and interfacial effects, like enrichment of asphaltenes, resins and heavy hydrocarbons at interfaces, can be neglected when lean and non-reactive gases are injected into an ultra light bearing reservoirs. On the other hand, the precipitation of paraffins and other waxes at oil/water interface may take place even at very low vaporization in both the reservoir space and the surface facilities. Since that interfacial, probably catalyzed phenomena is newly recognized, further laboratory and field studies are needed to elucidate its detrimental effects on recovery efficiency, well performance and surface technology.
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07.04.04, A.F. Tynyany
NUMERICAL SIMULATION OF QUASI STATIC CONTACT PROBLEM WITH ELASTOPLASTIC MATERIAL MODEL IN ANSYS/LS-DYNA
http://www.ogbus.ru/authors/Tynyanyi/Tynyanyi_1.pdf (in russian)
For minimization of mass and production cost of spherical joint "Master" sheet blank forming process is offered. Analysis of quasi static contact problem with elastoplastic material model is provided by finite element method into LS-DYNA. Localization of overloaded places in numerical model of blank is identical with experiments. Tempering of metal blanks before and after forming operation is recommended. The maximal thickness of blank does not exceed 8 mm for joint of 50 mm diameter rods.
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02.04.04, S.B. Sapojnikov, M.V. Forental
IDENTIFICATION OF MATERIAL MODEL PARAMETERS BY DESIGN-EXPERIMENTAL METHOD USING ANSYS AND LS-DYNA PACKS
http://www.ogbus.ru/authors/Forental/Forental_1.pdf (in russian)
LS-DYNA software is using long time for deciding the problems of punching the metal plates by high velocity objects. Herewith needs are appeared for determination of plastic characteristics of these material under high velocity loading. It is offered identification of elastoplastic model of material to conduct by the theoretical - experimental method. As the main limitations on an experimental procedure are followings: the experiment should be simple enough and highly quantitative. As such experiment there can be used an impact of a high hardness sphere with known initial velocity on a plate from an investigated material.
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30.03.04, S.B. Sapojnikov
DESIGNING OF DEPTH PUMP FIBERGLASS RODS ASSEMBLY
http://www.ogbus.ru/authors/Sapozhnikov/Sapozhnikov_1.pdf (in russian)
Main technical problem of using glass-fiber plastics is a structure of load bearing part. Stan-dard bond joint of steel end and glass-fiber rod under the GOST possesses a serious defect, con-nected with nonhomogeneity of shear stress on the axis of rod. Obviously the most perspective structure will be bonded joint with conical parts to use not only adhesion power but also pressure-shear interaction to increase strength.
Modeling of all details and assemblies were made into SolidWorks, which allows to use parameterization for the following fast changing a geometry at the searching for optimum designs of joint. Calculations of stress-state are conduct by the FEA method into DesignSpace software.
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25.03.04, A.A. Shapiro
FINITE STRAIN PROBLEMS IN ANSYS AND LS-DYNA. APPLIED NUMERICAL METHODS VERIFICATION
http://www.ogbus.ru/authors/Shapiro/Shapiro_1.pdf (in russian)
Present-day finite element method (FEM) packages, such as ANSYS and LS-DYNA, are multiple objective complexes for the analysis and a solution of the broad audience of tasks in different areas of physics. In all these packages possibilities for problem solving in geometrically nonlinear setting are announced. However the analysis of domestic both foreign references and simples tests have allowed to place, that the numerical methods used now by the most popular packages for solving of finite strain problems, are insufficiently correct and give an adequate estimation only in special cases. The refusal from an offsets and strains smallness hypothesis in solid mechanics reduces in significant problems which till now up to the extremity are solved, despite of the urgency for practical applications.
In this article the main attention is given to inspection of reasonableness of the outcomes obtained at calculations of tasks with finite strains in FEM packages. The verification scheme is offered and trying is made to outline boundaries of applicability of two popular packages (ANSYS and LS-DYNA) for finite strains problems solving.
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03.03.04, F.A. Agzamov, N.Kh. Karimov, D.V. Morozov, N.A. Nogaev, M.A. Shotai, A.F. Devyatko.
PECULIARITIES OF WELL CASING AND CEMENTING IN AMANGELDY GAS FIELD, THE REPUBLIC OF KAZAKHSTAN
http://www.ogbus.ru/authors/Morozov/Morozov_1.pdf (in russian)
An integrated solution of the tubing-casing annulus pressures problem in Amangeldy Gas Field has been demonstrated. Plugging-back and viscoelastic system formulations have been substantiated experimentally. Experimental investigation results have been given.
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27.02.04, Egorova E.N.
Kinds of natural resources of sea environment, sensitive to oil spill pollution accident
http://www.ogbus.ru/authors/Egorova/Egorova_1.pdf (in russian)
The author allocates five kinds of natural resources in structure of sea environment and analyzes each of them on a degree of sensitivity to spilled oil pollution by accident. As a result of research the following natural resources sensitive to oil pollution are separated: biological resources, recreational resources, assimilated potential of water area and chemical resources of water, as these kinds of resources will get negative changes because of spilled oil pollution by accident on water area of the sea or littoral territory.
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25.02.04, Shokir E. M. El-M.
A NOVEL PC PROGRAM FOR DRILL STRING FAILURE DETECTION AND PREVENTION BEFORE AND WHILE DRILLING SPECIALLY IN NEW AREAS
http://www.ogbus.com/eng/authors/Shokir/Shokir_1.pdf
Drill string failure is due to a lot of reasons, which may occur either individually or in-group. In order to prevent or at least minimize occurring drill string failure, all reasons should be recognized. To do that, one should have a good designed approach to test all factors, affecting drill string failure, to early eliminate the problem. Early studied cases were analyzed without an overall approach and without revealing the actual reasons of the drill string failure.
This paper introduces a new interactive program that helps to recognize and prevent the drill string failure before and while drilling. The validity of this program is successfully approved by its application on some failure cases. Therefore, it could be successfully applied in other cases, and easier recognized if the drill string is close to fail and hence an immediate action is to be taken to improve the drilling parameters to prevent the drill string failure.
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