Geology, Geophysics and Development of Oil and Gas Fields

The article specifies the geological structure and oil and gas potential of the region. Not always negative or inadequate results of well testing can be attributed to the quality of primary and secondary reservoir opening. Similar results can appear when finding hard-to-recover hydrocarbon emulsion accumulations. The author of the paper expresses reasoned assumptions that oil and gas provinces are characterized by a significant development of tectonic-dependent accumulations of hydrocarbons, which contain water-oil emulsions or closely associated with them. The author also thinks it necessary to take this fact into account when evaluating the results of search, exploration and development of such clusters and to optimize the method of oil and gas prospecting surveys in accordance with the regions’ tectonics specific features and the fractures’ development.

Key words: water-oil emulsion; oil and gas potential; hydrocarbons; method; fracture; tectonics.

Order this article in the electronic library

UDC 550.8.02:553.98:551.72

LITHOTYPES IDENTIFICATION AND

SEDIMENTОLOGICAL SPECIFIC FEATURES OF SEDIMENTS,

DETERMINED BY THE CORE OF WELLS’ OF SOUTH-YAGUNSKY DEPOSIT

(р. 9)

Galinsky Kirill Alexandrovich

Tyumen Industrial University (TIU)

38, Volodarsky str., 625000, Tyumen, Russian Federation,

e-mail: galinsky@crru.ru

Borodkin Vladimir Nikolaevich

A. Trofimuk Institute of Petroleum Geology and Geophysics, West-Siberian branch, Siberian branch of the Russian Academy of Sciences (WSB IPGG SB RAS)

56, Volodarsky str., 625000, Tyumen, Russian Federation,

tel.: (345) 246-58-27,

tel./fax: (345) 246-56-02,

e-mail: niigig@tmnsc.ru

Belova Elena Vladimirovna

"V.I. Shpilmann Scientific-Analytical Rational Mining Center"

POB 286, 75, Malygin str., 625026, Tyumen, Russian Federation

During extraction of hydrocarbons in South-Yagunsky field, there arise various technological difficulties, caused by some specific features of the West-Siberian mega-basin formation, thus making it really necessary to carry out special detailed lithological and paleontological researches, including sedimentological ones.

The paper’s purpose is to identify lithologically homogeneous types of deposits by the particle size composition of rocks, by their textural and structural specific features, by paleontological and lithological characteristics. The paper defines (diagnoses) the rock’s genesis and assigns it to a group of deposits, to a definite facies or to a specific environment of sediments accumulation by means of using of identification signs and diagnostic tables-determinants under the editorship of O.S. Chernova. According to varieties, independently identified by the authors (structurally homogeneous sedimentary units – lithotypes), there marked various facies conditions, carried out their detailed interpretation. The studies resulted in core material systematization by facies characteristics, highlighting the main types of sedimentary environments. The studies also prove the fact about the difference in rocks’ formation conditions at different stratigraphic levels of the section, tested by core. The research results can be used when identifying the criteria of prediction of oil and gas potential, quality assessment of collectors and covers, oil and gas potential of further predictions of the territories’ oil and gas potential, besides, they can also be useful to justify further exploration work for oil and gas.

Key words: sedimentary basin; paleontological characteristics; lithotypes; studies.

Order this article in the electronic library

UDC 622.276.1/.4.001.57

EXPERIMENTAL RESEARCH AND MODELING OF INFLUENCE

OF WEAKLY-MINERALIZED WATER INJECTION ON OIL RECOVERY

OF A FORMATION (р. 19)

Mikhailov N.N.

Gubkin Russian State University of Oil and Gas

65, Leninsky рrosp., 119991, Moscow, Russian Federation,

e-mail: folko200@mail.ru

Melekhin S.V.

"PermNIPIneft", a branch of LLC "LUKOIL-Engineering" in the city of Perm

29, Sovetskaya Armiya str., 614066, Perm, Russian Federation

Polishchuk V.I.

Oil and Gas Research Institute Russian Academy of Sciences (OGRI RAS)

3, Gubkin str., 119333, Moscow, Russian Federation

The effectiveness of weakly-mineralized water injection as both secondary and tertiary methods of formations’ enhanced oil recovery method is being analyzed. It's shown that the major technological effect of weakly-mineralized water injection as compared to formation water injection lies in reduction of resultant average residual oil factor. The effect of residual oil factor reduction is controlled by the ratio of the variation of pressure gradient to capillary pressure. Previous experiments do not cover the wide range of this variation during water flooding. The series of experiments has been performed to study the influence of the change of injected water mineralization on the residual oil factor in case of the wide variety of displacement conditions and tested core samples properties. The dependencies of residual oil change in various displacement conditions and the injected water mineralization have been obtained. Based on the results varied out using the author's hydrodynamic model, inter-well residual oil distribution has been studied. The effects of oil recovery enhancement in case of change of injected water mineralization have been evaluated. The criteria of low technological effectiveness due to initial permeability reduction have also been established.

Key words: oil recovery; residual oil; secondary recovery; enhanced oil recovery; formation water; weakly mineralized water.

Order this article in the electronic library

UDC 622.02:531+622.83

RESEARCHING OF RESERVOIR-ROCKS COMPACTION PROPERTIES

OF OIL FIELDS, DEVELOPED BY LLC "LUKOIL–KOMI" (р. 31)

Popov Sergey Nikolaevich

Oil and Gas Research Institute Russian Academy of Sciences (OGRI RAS)

3, Gubkin str., 119333, Moscow, Russian Federation,

tel.: (499) 135-71-81,

e-mail: popov@ipng.ru

Kusaiko Andrey Sergeevich

NPP "Geoprofi"

6/1, Kanunnikov str., 400001, Volgograd, Russian Federation,

tel.: (844) 243-05-03,

e-mail: a.s.kusaiko@nppgeoprofi.ru

Ozun Igor Alexeevich

LLC "LUKOIL–Komi"

31, Neftyanikov str., 169712, Usinsk, Russian Federation,

tel.: (821) 445-58-27,

e-mail: Igor.Ozun@lukoil.com

This paper presents the research results of the reservoir-rocks compaction properties of the oilfields, developed by LLC "LUKOIL–Komi". The experiments were processed by a special method application that allows determining the parameters of total (elastic and plastic) and elastic compaction as well as the hardening parameter. The authors obtained these parameters’ correlation dependences on the tested samples porosity. On the basis of the dependencies obtained it is possible to predict the deformations of the main reservoirs in the region of the fields location in the process of the reservoir pressure reduction, including changes in porosity, knowing only the initial value of the parameter.

Key words: compressive properties; core samples; effective stresses; elastic-plastic compaction coefficient; elastic compaction coefficient; hardening coefficient.

Order this article in the electronic library

UDC 622.276

INTEGRATED LABORATORY RESEARCHES OF ACIDIZING TECHNOLOGY

OF TERRIGENOUS AND CARBONATE RESERVOIRS TREATMENT,

INCLUDING USE OF SELF-FLUCTUATING ACID COMPOSITION

(р. 36)

Barkovsky Nikolay Nikolayevich,

Plotnikov Vladimir Victorovich,

Yakimov Oleg Igorevich,

Chabina Tatyana Vladimirovna,

Permyakov Alexander Yurievich

"PermNIPIneft", a branch of LLC "LUKOIL-Engineering" in the city of Perm

29, Sovetskaya Armiya str., 614066, Perm, Russian Federation,

tel.: (342) 233-64-93 (Perm), (342) 717-01-53 (Kungur),

e-mail: Nikolaj.Barkovskij@pnn.lukoil.com, Vladimir.Plotnikov@pnn.lukoil.com, Oleg.Jakimov@pnn.lukoil.com, Tatjana.Chabina@pnn.lukoil.com, Aleksandr.Permjakov@pnn.lukoil.com

Acid treatment is an effective and widely used method of influence on a layer’s well bottom zone, designed to increase or restore production and injection wells flow-rate.

The efficiency obtained when implementing the technology in the wells directly depends on the quality of reagents selection in laboratory conditions for specific geological and physical conditions of the objects under development. Insufficient coverage of laboratory studies can lead to a decrease in productivity of the reservoir to be treated, and, consequently, to the loss of oil production. Improvement of the researches quality requires a unified approach to laboratory simulation that includes researches in the "free volume" and reservoir charactertics tests using core samples.

The paper discusses the problem of an integrated approach to the reagents laboratory study used when conducting acid treatments. The order of acid compositions studies, including deflecting systems and self-fluctuating acid compositions in the "free volume" for various collectors, as well as the method of conducting filtration tests on core material of a definite rock with account of thermobaric mode of a layer are presented.

The results obtained while carrying out researches in accordance with the proposed algorithm can be utilized in field conditions during the implementation of wells’acid treatments technologies.

Key words: acid treatment; free volume; testing of reservoir characteristics; self-fluctuating acid composition; reservoir properties (porosity and permeability).

Order this article in the electronic library

UDC 550.84

COMPREHENSIVE GEOCHEMICAL STUDIES AT SOME OBJECTS

OF THE WESTERN SIBERIA (р. 43)

Cherepanov V.V.

JSC "Gazprom"

16, Nametkin str., 117997, Moscow, Russian Federation,

tel.: (495) 719-30-01

Menshikov S.N., Varyagov S.A., Nersesov S.V.

LLC "Gazprom dobycha Nadym"

1, Zverev str., 629730, Nadym, Tyumen region, Yamalo-Nenets autonomous territory, Russian Federation,

tel.: (349) 956-73-53,

fax: (349) 956-71-41

Myasnikov I.F.

LLC "KGI"

Mirotvorsky M.Yu., Zvereva V.B.

CJSC "SPC Geochemistry"

5, Bolshoy Eldoradovsky pereulock, 125167, Moscow, Russian Federation,

tel.: (495) 685-12-80

An integrated method of geochemical studies that allows determining a wide range of individual hydrocarbons (up to С₂₄) in the surface sediments, cores or wells’ mud holes by applying the methods of gas and gas-liquid chromatography.

As an example of such a complex study reviewed the results of the works carried out in the well No. 72 (Nydinsky site of Medvezhie oil- and gas-condensate field) as well as the materials of the surface geochemical survey performed in Semtakhsky (oil) and Tagrinsky oil- and gas-condensate field are used as an example of such a complex study.

Key words: the Western Siberia; oil- and gas-condensate field; geochemical surveys; gas and gas-liquid chromatography; prediction of territories with oil and gas potential.

Order this article in the electronic library

JSC "ALL-RUSSIAN SCIENTIFIC-RESEARCH INSTITUTE OF ORGANIZATION, MANAGEMENT AND ECONOMICS OF OIL AND GAS INDUSTRY"

Main page of journal