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Identification of Non-Structural Deposits of Oil and Gas: Theoretical Aspects 

P.N. Strakhov and O.A. Bogdanov, A.B. Sapozhnikov, E.P. Strakhova

Key words: reservoir, hydrocarbons, oil, structural map, facies zone, accumulation, post-sedimentary changes, seismic exploration

The paper considers the main factors determining the possibility of the non-anticline traps formation as well as their classification according to the genetic principle. The paper also considers the mechanism of their formation as the result of post-sedimentation processes, along with the analysis of the influence of accumulation conditions on the formation of lithological deposits. It is noted, that the reservoir top does not always occur according to the nearest basic horizon. So, the trap may not be mappable at all, if relying on the structural plan of the stratigraphic surface of the target reservoir.

Well Construction Improvement by means of Build-Up Performance of Light Alloy Drill Pipes
at Operation with Various Drilling Flush Fluids

A.I. Safrider, R.A. Ismakov, and A.Kh. Agliullin, M.N. Nazarova, N.K. Tsenev

Key words: Light-alloy drill pipes, tribotestings, D16T alloy, horizontal drilling, drilling flush fluid, lubricant additives

As the productive formations deepen and the horizontal sections of the wells increase, the use of light-alloy drill pipes (lightweight drill pipes - LWDP) becomes more relevant. One of the advantages of light weight pipes is their weight, which is about 3 times lighter than that of steel ones. Special aluminum alloys are promising materials for the production of high-strength drill pipes from light alloys and could be used in areas with a harsh climate and complex geological structure. The material of aluminum alloy has several advantages: high corrosion resistance in aggressive environments with high concentration of hydrogen sulfide and carbon dioxide; non-magnetic capacity when used as telemetry systems   measurement and logging while drilling; low index of sliding friction between the pipe surface and the borehole wall; light weight in drilling mud. In this paper, we consider obtaining sub-microcrystalline structure of aluminum alloys by means of intense plastic deformation and its influence on the wear resistance of the material during various operations during drilling. By the example of a model sample of aluminum alloys D16T, it is shown that the obtained sub-microcrystalline structure contributes to a significant increase in wear resistance in various drilling muds. Additionally, studies have been carried out to obtain wear rates for the alloy D16T in drilling fluids with various lubricants.

Calculation of the Components Distribution in the Occurring Hydrate

E.P. Zaporozhets and N.A. Shostak

Keywords: hydrate, hydrate formation, component composition, phase equilibrium constants, phase transformations

Solving problems related to the hydrates formation out of multicomponent gases requires the ability to determine the ratio of components absorbed by hydrates, depending on the balanced thermobaric and stoichiometric conditions for the formation of the latter. Modern methods for determining the composition of gases absorbed by the hydrate from a multicomponent mixture give large discrepancies (up to 40% depending on thermobaric conditions).

In order to improve the accuracy of determining the concentration of components absorbed by hydrate, a calculation method is proposed based on the representation of the adsorption process of hydrate formation using phase equilibrium constants for the gas-liquid system taking into account the phase transformations kinetics during hydrate development: the hydrate is completely formed (the system is in ultimate balanced condition); hydrate grows (system in a non-balanced state); hydrate is formed with insignificant speeds.

Improving the Technique for Determining the Drainable Gas Reserves, Considering the Development History and Water Intrusion

S.Yu. Sventsky, A.O. Lysov, A.V. Korobeynikov 

Keywords: simulation, gas fields, reserves calculation, material balance, aquifer

The paper discusses the well-known methods for gas reserves calculation based on the material balance concept. The area the presented methods applicability is justified and the author's method for calculating gas reserves is proposed. This method was created taking into account the quantitative evaluation of additive effects, which made it possible to expand the applicability of the material balance concept.

Justification of the Maximum Flow Rates of Gas Wells at the Cenomanian Deposits in Order to Prevent the Bottom-Hole Zone Destruction and Abrasive Wear of Wellhead Equipment

A.I. Ermolaev, S.I. Efimov, E.P. Mironov, A.A.Legay

Keywords: gas, flow rate, depression, equipment wear, formation destruction, well, wellhead

Two methods are proposed to determine the flow rates limits. The area of the techniques’ application is to substantiate the technological modes of gas wells operation amid limited field geological information, which does not allow applying correctly other methods that more accurately simulate the patterns of productive formations’ destruction and downhole equipment abrasive wear and require more field and laboratory data as the initial information.

Experimental Modes’ Simulation at the Late Stage Operation of Low Temperature Separation Comprehensive Gas Treatment Unit at the Yubileynoye Field

I.I. Baydin, A.N. Kubanov, E.S. Podolyansky, B.T. Tkesheliadze, A.V. Dunaev, A.V. Prokopov

Keywords: Yubileynoye oil, gas and gas condensate field, comprehensive gas treatment unit, low-temperature separation, plate heat exchanger, hydraulic losses

The article is dedicated to the full-scale experiment to study the operation modes of the low-temperature separator (LTS) of comprehensive gas treatment unit (CGTU) at the Yubileynoye oil, gas and gas condensate field, which will take place at the stage of the low inlet gas pressure. Since the plate heat exchangers previously show insufficient performance, including high hydraulic losses, the measures are required for efficient CGTU operations at high gas volumetric flow rates in order to meet serious pressure drop in whole LTS and expected gas production increase. These measures could be developed only by means of full-scale simulation of future LTS operation modes and its analysis.

Distribution of the Specified Cumulative Gas Yield over the Wells of Gas and Gas-Condensate Reservoir with respect to Minimum Reservoir Energy Losses

A.I. Ermolaev, A.A. Nekrasov, and I.A. Trubacheva 

Keywords: algorithm, gas, hydrodynamic model, pressure, flow rate, condensate, optimization, formation, well, filtration.

The paper presents a method for the distribution of a specified cumulative gas yield over a group of gas condensate wells that is optimal with respect to the minimum loss of reservoir energy, which corresponds to the highest condensate extraction. The problem conversion allows applying the well-known linear programming algorithms, for example, the simplex method for its solution. The proposed approach was tested, which means comparing the results of solving the problem by the proposed method and optimization tools built into hydrodynamic simulators.

Numerical Modeling of Oil Pipeline Leakage Detecting by means of Temperature Control along The Fiber Optical Cable

M.A. Smychek, A.A. Mamontov, D.V. Parfenov

Keywords: fiber optic sensor; oil pipeline; thermal field; oil spill; oil leakage modeling, oil outflow in subsoil

The article considers the chance of detecting the product leakage from the main pipeline on the basis of the temperature distribution alongside the fiber-optic cable located on the monitored site. Leak detection occurs due to a soil temperature change because of the temperature difference between the soil and the spilled product. The paper presents the simulation of emergency petroleum products outflow through small openings, so that by changing the initial data, it is possible to estimate the range of leaks that an extended sensor of a fiber-optic cable can detect. Using the ANSYS software package there were obtained the patterns of the subsoil thermal area formation and propagation for product leaking of various intensities.

Development of a Reference and Test Base for High-Precision Flow Meters Verification at Operating Environment

V.A. Sulin, O.V. Kryukov

Keywords: gas flow meter, verification, metrological characteristics, flow measuring center, gas pipeline

The paper considers the scientific, technical, economic and political aspects of the prerequisites for creating a reference and test base of metrological centers for measuring the quantity and quality characteristics of natural gas and liquid hydrocarbons. The paper presents measures to improve metrological support of natural gas production, transportation and processing with more accurate volume metering and losses reduction. Higher technical characteristics of gauges and ability to gain experience in verification and testing will increase the level of knowledge in these areas.

Operational Cost Reduction: Muravlenkovskoye Gas and Oil field – Komsomolsky Gas Production Facility Inter-Field Gas Pipeline

O.Yu. Manikhin, N.S. Saenko

Key words: Komsomolsky gas production facility, Muravlenkovskoye oil and gas field, inter-field gas pipeline, hydrate free operation of an inter-field gas pipeline, methanol, triethylene glycol. 

In order to reduce costs of the inter-field gas pipeline operation it was proposed to replace the design hydrate formation inhibitor   methanol with triethylene glycol (TEG) which, under the existing technological scheme of comprehensive gas treatment unit (CGTU) operation can be recovered, regenerated and reused at less capital investments.

According to the results of bench tests, the optimal concentration of TEG water solution was determined, which ensures the lowest crystallization temperature.

The calculation of the inter-field gas pipeline operating modes was carried out by means of GIBBS   domestic software for integrated simulation of crude hydrocarbons treatment. This is particularly significant in import substitution environment.

The calculation results of the inter-field gas pipeline operating modes showed that the technology is efficient and provides transportation of crude gas over long distances without ice and hydrates. At the same time, the proposed technology provides preliminary gas dehydration, reduces the cost for gas treatment and infield gas transportation.

Scientific Provisions and Principles of Design, Operation and Decommissioning of Energy Generation Sources for Self-Contained Low Power Consumers

A.S. Grigoryev, V.A. Karasevich, A.O. Pimenov, I.A. Tutnov, I.A. Shpara

Keywords: cogeneration energy unit, power supply, self-containment, renewable energy source, safety, reliability, experimental physics.

The article describes the prospects for improving the technology of the power supply system for self-contained consumers using installed low-power units, reviews and analyzes existing developments, proposes a new research path for designing, manufacturing and operating power units and cogeneration plants that use both conventional and renewable fuel and energy resources. The technology development concept for the creation and long-term operation of self-contained power plants on the experimental physics basis is presented.

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© 2007-2015 Science & Technology in the Gas Industry