The article considers formation conditions of oil and gas potential and evaluated the prospects of searching of oil and gas accumulations in deep-lying (5 km and more) sediments of the south-eastern part of the Volga-Ural oil and gas province (Russian Federation) based on a complex analysis of geological, geophysical and geochemical studies and modeling of petroleum systems. Falling production of hydrocarbons in large fields and the depletion of the hydrocarbon resource in the Volga-Ural province make the problem of searching new exploration objects in deep sediments relevant. In this work, the elements and processes of deep-lying petroleum systems are studied, the catagenesis of organic matter of rocks is determined, the generation scale is shown, the time of trap formation is established, which allowed us to create the criteria base for predicting the oil and gas content of the sediments studied. The most promising local sites for searching of oil and gas accumulations at great depths within the south-eastern part of the Volga-Ural oil and gas province are identified.

Keywords: abnormally high pore pressures; great depths; Volga-Ural oil and gas province; gas; modeling; source rock; oil; organic matter; source of generation; petroleum systems.

References

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This paper discusses the application of low hardness alkali water compositions (LHAW) as a secondary and tertiary displacement agent for EOR. A comparative analysis of the impact of low salinity water (LSW) and LHAW water on interfacial tension, contact angle on rock, adsorption of ions, emulsion stability and clay swelling is presented. LHAW application contributes to the formation of stable water in oil (w/o) emulsions
and a decrease in clay swelling compared to LSW. Adsorption values for both fluids are similar. Contact angle measurements show that both LSW and LHAW reduce interfacial tension compared to Synthetic Caspian Sea water (SCSW), by up to 17% and 94% respectively. Similar results were observed for contact angle measurements. Flooding experiments were conducted in secondary and tertiary modes. In secondary flooding the two water compositions LHAW-2 and LHAW-1 increased the oil recovery (%OOIP) in comparison with SCSW at water breakthrough, by 29% and 25% respectively. The final oil recovery increases were 21% and 15% respectively. In tertiary flooding, tests showed that LHAW-2 and LHAW-1 oil recoveries (%OOIP) compared to LSW were 13% and 10% respectively. The oil recovery rate for LHAW solutions was not linear versus lnt as was that for LSW. This was proposed as a consequence of emulsions generation while water-cut is below 50% however, above 50% water cut the rate stabilizes.

Keywords: EOR; Low hardness alkali water; Sandstone flooding; Bentonite swelling; Low salinity water; Emulsion.

References

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As an extension of the pipeline in the direction of the flowstream, there must be installed a condensate accumulating ank serving as a trap downstream the separation unit to get mechanical solid particles and condensate accumulated and have them separated due to their mechanical energy with regard to special mass from the transported gas in gas production and the gas flow stream should be rerouted by three-way valve upstream the tank.In oil production, in order to perform the separation of the mechanical solid particles in the composition of oil due to special mass difference thanks to their mechanical energy and their accumulation, a vertical tank serving as a trap should be installed on the extension of oil reservoir upstream the oil and gas separator and the oil flow direction must be rerouted towards the oil and gas separator by the three-way valve upstream the tank.

Keywords: gas separator; oil&gas separator; condensate; mechanical solid particles; screen; condensate accumulating tank; density.

References

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One of the most serious complications at production, transport and preparation of oil are asphalting pitch paraffin deposits. Their formations in the underground borehole equipment and also in discharge lines, pipelines of system of collecting increase costs of oil production. For the solution of these questions enough effective reagents aren't present.We have developed multicomponent and multipurpose MORE-R, RÇ-R reagents. Influence of these reagents on temperatures of hardening oils, dissertating of paraffin and its dissolution and also paraffin adjournment was investigated. New reagents took root at «Neft Dashlar» Square and satisfactory results are received. The offered three-parametrical Gershelya-Balkli model can be used for assessment of rheological oil parameters at their transportation.

Keywords: asphaltenic rubber paraffin sedimentation; pump–compression pipe; reagents; dispersion of paraffin; reology parametric.

References

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This paper deals with the existing oilfield separation systems of water injection in accordance with the directions of formation water selections. The studies found that the practical value of evaluation technique of pumping effect is: the determination of effective compensation of formation water selections by means of injection into production and injection wells; the definition of injection wells which are not working on displacement and production wells which are getting not enough download; supplementing for identifying the wells with inflow water; the determination of layers with movable remaining recoverable reserves; the evaluation of the proportion of remaining recoverable reserves which are made additionally by the adjacent production wells.

Keywords: oil recovery; water injection in the directions of selections; recovery zone; residual water; dehydration.

References

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The proposed work presents the results of testing in the laboratory conditions of the developed multifunctional composition based on 30-50 nm copper nanoparticles and 1-butoxy-2-oxazolidinemethoxy propane as a biocidal composition and studying the possibility of its application in the oil industry. Sulfate-reducing bacteria were isolated from the reservoir waters of the Bibi-Heybat oil field on the Absheron Peninsula of Azerbaijan. The effectiveness of the prepared solution against biodegradation was studied in oil and cutting fluids. The antimicrobial efficacy of the investigated compound along with other components was studied by the disk diffusion method. The obtained data indicate that the proposed biocide composition quickly and effectively suppresses the growth of microorganisms. The latter fact is very important for the oil industry, since exactly sulfate-reducing bacteria are one of the main sources of biological corrosion and cause enormous damage every year.

Keywords: biocides; copper nanoparticles; 1-butoxy-2-oxazolidinemethoxy propane; sulfate-reducing bacteria.

References

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Studies were conducted on the selection of effective demulsifiers for the initial preparation of water-oil emulsion and dehydration of a hard-to-break wateroil emulsion (TRVNE) formed during the preparation of crude oil. It has been established that, based on the results of a bootle test, the ND-12А demulsifier provides the maximum dehydration of oil in comparison with the dissolving agent Dissolvan-4411 under certain test conditions. As a result of tests with TRVNE samples, the ND-12А demulsifier was selected as an effective demulsifier. Unlike Dissolvan-4411, the demulsifier ND-12А makes it possible to completely destroy the TRVNE with a clear interface. The residual water content in the oil is minimal, and the mechanical impurities are in the order of the norm.

Keywords: water-oil emulsion; hard-to-break water-oil emulsion; demulsifier; bootle test; flow; demulsification conditions.

References

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The article is devoted to the development of special methods for forecasting accidents of gas-pumping unites (GPU) based on the interpretation of the vibrational spectra of the oscillations of the low-pressure turbine thrust bearing housing (PMO TND)  body case. When developing a complex defect, it is proposed to use the value of the correlation dimension, determined on the basis of the one-dimensional frequency range of the measured vibration velocity of the housing of the GUP TND GPA, as an additional criterion. It is shown that in the defect-free state of the gas pumping unit, the dependence of the correlation dimension of the strange attractor (v) on the dimension of the enclosed space (m) has the form of a curve with saturation and in the corresponding coordinates goes to the asymptotic horizontal boundary. If there is a danger of an emergency failure, then the saturation of the function v(m) is not observed in the entire research area, the correlation dimension v(m) increases monotonically with the enclosed space increasing dimension.

Keywords: vibrospectrum; amplitude; correlation dimension; attractor; phase space; deterministic chaos.

References

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In article is considered the problem of associated petroleum gas (APG) combustion in the oil companies based in Russia. At the moment, the utilization percent of the gas extracted together with petroleum, does not reach does not reach necessary indicators normalized by the legislation. According to official data no more than 80% of produced APG are rationally utilized (a rated value – 95%). Due to combustion of APG is followed by an oxygen consumption and an excessive heat generation it negatively affects on the environment and as a result leads to enhanced greenhouse effect. In article is set a task to reveal main directions of associated petroleum gas utilization and to determine possible efficiency of applied technologies on the example fields of the oil and gas production department Yamashneft. During the research most common methods of APG usage within industrial base were studied.

Keywords: associated petroleum gas; torch; thermal furnaces PPNT-1,6; gas-piston installations AGP-200; gas turbine installations CAPSTONE C-class; water-gas mixture.

References

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