Territorija Neftegas № 9 2014
Read in this issue:
» Quality of insulating coatings is the most important aspect in ensuring corrosion protection of gas pipelines
This article deals with the issues of monitoring corrosion processes at gas pipelines and problems arising in the course of the diagnostic works complex. The authors propose some solutions in the area of corrosion protection of gas pipelines and repair technologies that by increasing coatings lifetime will enable to stabilize the scope of the required monitoring of corrosion processes and optimize costs of ensuring pipelines corrosion protection.
Keywords: monitoring, corrosion defects, size of corrosion centers, corrosion rate, pig inspection, insulating coatings, passive corrosion protection, efficient expenditure.
» Enhancement of corrosion protection efficiency of main pipelines with application of smart coatings
This paper considers the value of transition resistance of insulation coating necessary for efficient operation of electrochemical protection in case of exfoliation of coating from pipeline metal and formation of open slot defect. A possibility is shown for application of corrosion protection of double-layer smart coatings based on epoxy-polyelectrolyte composites and the conditions are determined, under which their application is feasible at the main pipelines.
Keywords: underfilm corrosion, protection potential, transition resistance of coating, smart protective coating.
» The dynamic connection of the reservoir pressure maintenance systems and production wells
One of the main parameters that affect the safety of electric submersible pumps (ESP) wells, is the dynamic level. The magnitude of the dynamic level depends on a number of parameters not only producing wells, but also subsystems maintain reservoir pressure (PAP). When the PAP parameters calculated on the basis of the compensation method, ie based on the integral injection and production volumes, the dynamic of complex «system PAP – layer – production well» is usually not taken into account. The article examines the impact of the interaction dynamics injection and production wells on the dynamic level, and as a consequence, the safety of the ESP. It is shown that even small changes in injection parameters can strongly influence the accident ESP operation.
Keywords: electric submersible pumps, system maintain reservoir pressure, layer, production well, dynamic, interaction.
» Methods for assessing total capacity of wind farms
This paper continues research into the potential of the Russian wind power engineering, performed by the Department of Thermodynamics and Heat Engines of Gubkin Russian State University of Oil and Gas in cooperation with the Royal Institute of Technology (Stockholm, Sweden) under the program «Energy Saving Technologies for Gas Transportation Systems», and deals with the methods for assessing the installed capacity of wind farms when the layout of the wind driven power plant with horizontal axis does not create aerodynamic shading zones
Keywords: potential, wind power engineering, wind driven power plant (WDPP), wind farm (WF), total capacity, wind rotor diameter.
Fields Development and operation installation
» Thermostating of equipment for performance of filtration experiments at abnormally low formation temperatures
Development of oil and gas fields in eastern regions of Russia characterized with abnormally low formation temperatures provides for carrying out a set of experimental researches of the processes of multi-phase filtration in the formation systems for study of hydrodynamic parameters with application of state-of-the-art experimental equipment.
Keywords: simulation of formation processes, abnormally low temperatures, thermostating, Chayandinskoye oil and gas condensate field, multi-phase multi-component filtration, expulsion of fluids.
» Retrospective analysis of hydraulic seam fracturing system application at Priobskoe Field (South licensed area)
The article is aimed at summarizing results and determining main trends associated with application of large-scale hydraulic seam fracturing under conditions of unique Priobskoe Field (South licensed area). More than 3.3 thousand «per-seam» hydraulic fracturings were performed in this area over 2002–2012.
Keywords: oil saturation, seam structure, permeability and conductivity of reservoirs, hydraulic seam fracturing, proppant mass, basic flow rate, efficiency factor, design of hydraulic seam fracturing.
Pipelines operation and maintenance
» Dependence of service life of the pipelines on the service factor
The article represents analysis of dependence of pipelines service life on the service factor. The data of witness-samples are provided being obtained at NDT laboratory and confirming the relevance of this topic.
Keywords: corrosion, wall thickness, standard operation lifetime, pipeline, service factor, diameter, pressure, design resistance.
» Research of redistributions of residual stresses in steel main pipeline appeared as a result of formation of dimple type defect in the pipe under the influence of internal pressure
The paper contains represented results of the study of issues concerning distribution and re-distribution of residual stresses of metal of oil pipeline as a result of formation of dimple type defect. Finite element representation of the pipe is constructed, the data are obtained on the values and zones of concentrations of residual stresses and deformations, and modification of location of these zones under influence of internal pressure is studied.
Keywords: main pipelines, dimple, strain-stress state, residual stresses, cold flows, finite element analysis.
» On-condition maintenance of gas pipelines
The methods for determining frequency of technical pipeline smart pigging and scopes of sample gas pipelines overhaul, required for their safe operation during on-condition maintenance, have been developed. Based on the analysis of statistical data on gas pipelines technical re-pigging, it is proposed to increase the rated value of time interval between smart pigging within the range from 6 to 10 years depending on the gas pipelines operational conditions and the scopes of their sample overhaul.
Keywords: gas pipeline, on-condition maintenance, damage, defect, frequency, planning.
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