Estimating the oil displacement coefficient by using statistical models in the conditions of Gazpromneft-Noyabrskneftegas JSC oil fields

This paper discusses topical problems of further effective development of depleted oil fields (DOF) to increase their final oil recovery on the example of the oil field in Western Kazakhstan. Further exploitation of fields using waterflooding becomes unprofitable. At the same time, on average at these facilities, at least 50% of the reserves will remain unrecovered. Most of the oil fields in the Republic of Kazakhstan are at the late and final stages of development, which is characterised by an increase in the share of hard-to-recover oil reserves, a decrease in annual oil withdrawals, and a high water cut of the produced oil. Therefore, the problems of improving the technology aimed at reducing the volume of associated water production and increasing oil recovery from partially flooded deposits is very urgent. With an increase in the well density, the degree of field drilling and aging of the well stock, the work with the current declining well stock remains a very topical issue. Improving the efficiency of diagnostics and the systematic selection of wells for repair and isolation works is an important element for rationalising field development in the current conditions of profit variance in the oil and gas industry. The methods of bottomhole zone treatment also implement a deflecting effect on filtration flows. Therefore, this method includes a wide range of geological and technical measures: down-spacing; water production restraining; conformance control of injectivity profiles; forced production; all types of mechanical, thermochemical and thermal technologies. Consider a number of geological and technical measures that perform the tasks of occupational safety rules. Geological and statistical models are proposed for diagnosing wells for a premature increase of water production using factor analysis calculations for base production and Hall plots. Results. The degree of temperature influence of the primary components of the compounds on the rheology, filtration characteristics, and stability of inverted emulsions was determined. The classification of oil loss factors was carried out based on the results of downhole analysis and oil production losses were determined. Geological and statistical models for well diagnostics for premature increase in water production were built using factor analysis calculations for base production and Hall plots.

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Study on Ultimate Recovery Factor and Oil Recovery Rate of Water-Flooded Sandstone Oil Fields in Eastern South China Sea

10.2523/iptc-21835-ms ◽

2021 ◽

Author(s):

Qi Xiong ◽

Zhenghe Yan ◽

Li Li ◽

Yong Yang ◽

Yahui Wang ◽

...

Keyword(s):

South China Sea ◽

South China ◽

Oil Recovery ◽

Recovery Rate ◽

Optimal Recovery ◽

Oil Fields ◽

Displacement Efficiency ◽

China Sea ◽

Oil Displacement ◽

Oil Displacement Efficiency

Abstract Under the natural energy development of Marine sandstone oil fields in the east of the South China Sea, the recovery degree of some oil fields has exceeded 65%, and the production capacity is still strong. The high-speed development model does not seem to have an adverse effect on oil recovery. Based on the existing knowledge and technical conditions, it is difficult to analyze and predict the final recovery rate of oil field. The reasonable boundary between the oil rate and recovery is also unclear. In this study, we investigate the correlation between oil rate and recovery rate by experiment and field practice. Based on the microscopic displacement experiment, the variation rules of phase permeability, wettability, residual oil, displacement efficiency and sweep volume of different displacement multiples are studied. The variation law of oil rate and recovery under different fluidity and well control conditions is studied by mathematical statistics according to the production dynamic data. Thus, the influencing factors and percolation mechanism of the optimal recovery under high multiples water flooding are clarified, and the relationship between the reasonable oil rate and optimal recovery under different reservoir conditions is formed. Micro experiments show that high multiples water flooding can improve the reservoir property, change wettability of rocks, reduce the residual oil saturation, improve oil displacement efficiency and the final oil displacement efficiency can reach 80%. Statistical research shows that when the oil recovery rate is less than 10%, the recovery rate increases with the increase of oil rate. For bottom water reservoirs, the recovery rate is recommended to be no more than 8%. The paper innovatively studies the correlation between the reasonable oil rate and optimal recovery in Marine sandstone oilfield from microscopic experimental analysis and macroscopic statistical research. The research results effectively guide the oil field production practice of more than 200 Wells in more than 20 oil fields in the eastern South China Sea in 2019, with a cumulative oil increase of more than 5 million barrels. And it has important guiding significance to the efficient and economical development of Marine sandstone oilfield.

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METHODICAL APPROACHES OF RESEARCH OF THE TEMPERATURE'S INFLUENCE ON COMPONENT COMPOSITION OF OVERVISCOUS OIL

Oil and Gas Studies ◽

10.31660/0445-0108-2016-6-61-64 ◽

2016 ◽

pp. 61-64

Author(s):

I. A. Guskova ◽

V. A. Sayakhov ◽

L. K. Shaydullin ◽

I. M. Ishkulov

Keyword(s):

Production Technology ◽

Component Composition ◽

High Potential ◽

Combined Effect ◽

Oil Fields ◽

Effect Of Temperature ◽

Extraction Technology ◽

Oil Displacement ◽

Viscous Oil ◽

The Impact

One of the perspective area of research is the development of oil fields with hard extracting reserves as the deposits of over viscous oil (OVO). For the research on the development of production technology of OVO, which provides a high potential of oil displacement, the method of assessing the impact of exposure to temperature and solvent on the component composition of the OVO was developed. The research results indicate the prospects of the development of OVO extraction technology, providing the combined effect of temperature and solvent.

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EOR Technologies: Physico-Chemical Aspects

Eurasian Chemico-Technological Journal ◽

10.18321/ectj563 ◽

2017 ◽

Vol 3 (3) ◽

pp. 179

Author(s):

L.K. Altunina ◽

V.A. Kuvshinov

Keyword(s):

Petroleum Chemistry ◽

Polymer Gels ◽

Heat Energy ◽

Oil Fields ◽

Cellulose Ether ◽

Hydrolytic Polycondensation ◽

Oil Displacement ◽

Physico Chemical ◽

Chemical Eor ◽

Environmentally Safe

The application of self-regulating oil-displacing systems is considered to be a promising trend in the development of physico-chemical EOR methods. Technologies intended to increase conformance predominate. EOR technologies, where heat energy of the formation is used to generate alkaline buffer systems, CO2 and gels increasing oil displacement and conformance, have wide potentialities. Such methods have been realized in the technologies developed at the Institute of Petroleum Chemistry SB RAS (IPC). Hydrolysis, hydrolytic polycondensation and coagulation in the system carbamide – aluminum salt – surfactant – water is the physico-chemical base for the technologies involving alkaline buffer systems, CO2 and inorganic gels. To prepare thermoreversible polymer gels one uses change of phase from solution to gel in the system: cellulose ether with a lower critical dissolution point – water. Presented are the results obtained on the application of physico-chemical EOR methods and technologies developed at IPC in oil fields of Russia. The technologies proved to be economically effective and environmentally safe. The period of payback is 5-12 months.

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