Oilfield Engineering

The works aimed at studying the efficiency of non-stationary effect have been conducted in Nothern Buzachy high-viscous oil field (Republic of Kazakhstan) within the last few years. The obtained results prove the fact that the non-stationary water-flooding technology is most effective when developing high-viscosity oil reservoirs. However, to maintain permanent high technological effect it is necessary to constantly modify the non-stationary effect technology as the mentioned technology is characterized by quick "ageing". The paper suggests some ways of enhancement of non-stationary water-flooding technology with the change of filtration flow direction at the expense of conversion of high-flow rate water-flooded producing wells into non-stationary operational mode.

Key words: non-stationary water-flooding; high-viscous oil; cyclic effect; oil recovery factor; water-cut.

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UDC 622.276.66:550.4

PROSPECTS OF INCREASING SUBSTANTIATION

OF FORMATION HYDRAULIC FRACTURING USING THE RESULTS

OF INTEGRATED COMPUTER TOMOGRAPHY AND ON-LAND

GEOCHEMICAL RESEARCHES (р. 9)

Mikhail Dmitrievich Zavatsky,

Andrey Alexandrovich Ponomarev,

Ivan Pavlovich Popov,

Dmitry Sergeevich Leontev

Tyumen Industrial University

56, room 208, Volodarsky str., 625000, Tyumen, Russian Federation,

e-mail: eksis2005@yandex.ru, ponomarev94@mail.ru, Leontev@sibgeoproject.ru

The article discusses the problems of the substantiation of the use of a formation hydraulic fracturing (HF) as a method of oil recovery enhancement. The lack of studies of void space structure often leads to the fact that hydraulic fracturing of a formation does not reach its goal – inflow increase or, in case of a flow rate increase a formation hydraulic fracturing, water percentage. To get the assessment data of prediction of HF efficiency it is proposed to use 3D modeling of pore space and cement structure based on the results of X-ray micro-tomography (MT) of reservoir-rocks, which gives an idea of the heterogeneity of reservoir void space at the micro-level. For more accurate extrapolation of the data obtained at the micro-level there suggested their use in a set with the data of the sedimentary cover’s vertical fluid-conductivity that are obtained as a result of on-land geochemical surveys. The observations showed that the set of the data will make it possible to predict the dissemination of the hydraulic fracturing impact depending on the existing heterogeneity of the formation under development. The works relating to development of 3D models classification of voids and their impact on the hydraulic fracturing efficiency are underway.

Key words: hydraulic fracturing of a formation; enhanced oil recovery; X-ray micro-tomography; on-land geochemical survey; fluid dynamics.

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UDC 622.276.43:678

PILOT INTRODUCTION OF THE POLYMER FLOODING

IN THE OILFIELD OF SOUTH TURGAY BASIN (р. 15)

Rustem Zhanibekovich Abirov,

Adelina Galymzhanovna Mukhamedova,

Bereke Panabekkyzy

Kazakh-British Technical University

59, Tole bi str., 050000, Almaty, Republic of Kazakhstan,

e-mail: r.abirov@kbtu.kz, a.mukhamedova@kbtu.kz, b.panabekkyzy@kbtu.kz

Nikolay Alexandrovich Eremin

I. Gubkin Russian State University of Oil and Gas

65, bld. 1, Leninsky prosp., 119991, Moscow, Russian Federation

Zhandos Zhanibekovich Abirov

LLC "SNF-Vostok"

42, pavilion 15, office 206, Timiryazeva str., 050057, Almaty, Republic of Kazakhstan,

e-mail: zhabirov@snf-group.kz

Artem Alexeevich Nestyerkin

LLC "Atrium"

42, pavilion 15, office 206, Timiryazeva str., 050057, Almaty, Republic of Kazakhstan,

e-mail: artem13@mail.ru

The paper is aimed at researching and analyzing the experience and intermediate results of the polymer flooding in Nuraly oilfield that is located in South Turgay basin. The paper presents the parameters by which the field was chosen for polymer flooding as well as parameters that served the ground for studying the hydrodynamic interconnection between production and injection wells. The paper describes the geology of the oilfield, discusses the results of the pilot implementation of the technology in the field such as oil recovery enhancement, technological effectiveness, etc. The urgency of the work lies in the fact that the results can be used while planning future activities of polymer flooding in other fields as this project is the first one among others in Kazakhstan.

Key words: geology of a field; development of a field; methods of impact; polymer flooding; efficiency; pilot introduction.

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UDC 622.276

MULTI-FACTOR ANALYSIS OF WATER SHUT-OFF EFFICIENCY

IN VARIOUS GEOLOGICAL-PHYSICAL RESERVOIR AND

WELL CONDITIONS (р. 20)

Yu.V. Zemtsov, A.S. Ustyugov

"Tyumen Petroleum Research Center, Ltd."

42, Maxim Gorky str., 625048, Tyumen, Tyumen region, Russian Federation

The contemporary state of development of a great number of West Siberia fields is characterized by high water-flooding of the production and due to the fact the problems of water shut-off (WSO) becomes more significant for oil production cost optimization.

The article analyzes water shut-off effectiveness in oil producing wells in case of isolation of some independent flooded intervals of producing reservoirs by low-viscous (1…10 cP) selective waterproofing sealants (in particular, Si-organic reagents "AKOR", "VTS", "NVTS" compounds and gellants on basis of cross-linked polyacrylamides. Optimum and boundary conditions of the most important factors of water shut-off efficiency on the basis of combination of Mann − Whitney criteria and Wald diagnostic test are defined. The methodology of WSO feasibility assessment in the specific well conditions with regard to its geological-physical bottom zone conditions and current production rates is developed.

Key words: water shut-off; water shut-off activity; water shut-off efficiency analysis; Mann – Whitney criteria; Wald diagnostic test.

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UDC 622.279

PROFILE OF THE INFLOW TO A SLOPING GAS WELL BORE

IN THE STATIONARY MODE (р. 26)

S.K. Sokhoshko

Tyumen Industrial University

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

e-mail: sksohoshko@mail.ru

The paper discusses the work of a perforated slope gas well in a homogeneous anisotropic reservoir in the stationary mode. The solution of Liebenson function distribution in a reservoir is obtained using the stationary point source. To describe the gas motion in a wellbore there used the equation of the progressive flow with account of local resistance. The method of calculation and examples of calculation of the gas inflow profile of and the plots of flow velocity along the wellbore with account the geological-physical properties of the productive reservoir, the wellbore trajectory and the depression on the layer is presented.

Key words: gas well; inflow profile; progressive flow.

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UDC 622.276.031.011.431.2:550.832

THE STRUCTURE OF THE ROCKS PORE SPACE

AS AN INDICATOR OF CAPACITIVE-FILTRATION PROPERTIES

OF THE PRODUCTIVE RESERVOIRS (р. 29)

Vladimir Nikolaevich Koskov

Perm National Research Polytechnic University

29, Komsomolsky prosp., 614990, Perm, Russian Federation,

tel./fax: (342) 219-83-67,

e-mail: koskov.vn@yandex.ru

The paper presents the results of core laboratory studies when determining lithological composition and reservoir properties of terrigenous rocks. It is stated that clastic material grains composinges terrigenous rocks vary in their size, shape, degree of roundness and sorting granulometric and mineral composition, the type and composition of cement, its structure and ratio with grains. It is pointed out that these rocks specific features determine the pore space structure. The data about the reservoir properties dependence on the fractional composition are submitted. Layer-by-layer description of wells sections (including those without cores) is performed on the basis of wells geophysical survey (GIS) in combination with the core data. The influence of terrigenous rocks structural characteristics on the showings of gamma ray logging (GRL) is stressed. It is proved that when assessing hydrocarbon reserves the reservoir porosity can be determined by GRL diagrams. Equations of ∆Jγ = f(К_п) dependencies in a number of Perm region fields are obtained.

Кey words: lithology; core; GIS; reservoir properties; the structure of the pore space.

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UDC 622.279

TECHNOLOGICAL FLUIDS FOR TREATMENT

OF FORMATION BOTTOMHOLE ZONE OF TERRIGENOUS RESERVOIRS

IN THE UNDERGROUND GAS STORAGE FACILITIES (р. 34)

Evgeny Anatolievich Rogov

"Gazprom VNIIGAZ, Ltd."

115583, POB 130, Moscow, Russian Federation,

e-mail: E_Rogov@vniigaz.gazprom.ru

The paper presents some comparative results of laboratory studies of the effects of technological fluids compositions in order to restore the bottom hole zone permeability of a formation of terrigenous reservoirs and to increase wells productivity in underground gas storage facilities. To select a technological liquid composition there proposed some method and the ways of its implementation, which allows providing a simple implementation of operations and the comparability of the results of various compositions testing.

Key words: laboratory studies; permeability; technological fluid; underground gas storage facilities.

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UDK 622.276.031.011.437

ANALYSIS OF THE REASONS FOR LOW RESISTIVITY

OF PRODUCTIVE PAYS (р. 36)

S.I. Gusev

"Gazprom EP International B.V.", a branch in St.-Petersburg

58, Nevsky prosp., 191011, St.-Petersburg , Russian Federation,

e-mail: S.Gusev@gazprom-international.com

The current stage of oil and gas industry requires some new methods for evaluation and development of unconventional reservoirs. The low resistivity pays are an example of unconventional formations that can create additional challenges when assessing hydrocarbon potential. The high irreducible water saturation can be a reason for low resistivity pays, or it can be connected with the fact that standard interpretation techniques are ineffective for such formations. The low resistivity of the productive pay can be caused by clay content, conductive minerals, thin inter-bedding, etc. The correct determination of the reasons for low resistivity pays allows choosing the most effective method for interpretation.

Key words: well logging; low resistivity.

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UDC 622.276.1/.4

APPLICATION OF DYNAMIC ANALYSIS PRINCIPLES

FOR EFFICIENCY ENHANCEMENT OF WELLS OPERATION (р. 40)

E.Kh. Shakhverenova

Azerbaijan State University of Oil and Industry

20, Azadlyg prosp., AZ1010, Baku, Republic of Azerbaijan,

e-mail: karimov.zizik2013@yandex.com

The development of oil fields in the late stage, the choice of an optimum variant and tactics of wells operation require complex analysis for diagnosing the energy state of the reservoir system. This paper proposes a new approach to the management and control of wells maintenance, based on the application of the dynamic analysis principles and interpretation of geological and field information of wells operation process in Oil and Gas Production Department named after A.D. Amirov.

Key words: oilfield; development; approach; method; pressure; formation water; oil; reservoir.

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UDC 622.276.5.05

ADVANTAGES AND DISADVANTAGES OF DUAL INJECTION TECHNOLOGY

USING MANDRELS, EXPERIENCE OF ITS IMPLEMENTATION IN OIL AND

GAS PRODUCTION DEPARTMENT (NGDU) "ALMETYEVNEFT" (р. 43)

Marat Mazitovich Malikov

"Almetyevneft" Oil and Gas Production Department, PJSC "Tatneft"

35, Lenin str., 423450, Almetyevsk, Republic of Tatarstan, Russian Federation,

e-mail: mmm93_10@mail.ru

Bulat Flusovich Zakiev

LLC "UPTZh for PPD"

11, Musa Jalil str., 423450, Almetyevsk, Republic of Tatarstan, Russian Federation

Practice has repeatedly proved the fact that dual injection (DI) is nowadays one of the most promising technologies in the field of development management. Mandrel DI technology involves the use of special chambers in the down hole equipment assembly designed for mounting of control devices and measuring gages in a well in the interval of the producing formation. Considering the advantages of DI scheme with mandrel technology application as compared with single-packer double-lift assemblies it is necessary to underline the following facts: firstly, the possibility of obtaining extra oil production due to separation of not two but three objects; secondly, the increase of wells’ potential wells for DI schemes application; third, the possibility of a well operation with the existing or isolated violation; fourth, the possibility of the assembly introduction even if the operational casing string narrows up to 142 mm. One more advantage lies in the possibility of transmitting information about a well’s work and the packer’s tightness in the telemetry system on-line.

Key words: dual injection; mandrels; multi-packer assembly; down hole gauges.

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UDC 622.276

HISTORY, ANALYSIS AND CONTROL OVER PRODUCTION RISKS

IN OIL AND GAS COMPANIES (р. 49)

O.E. Kochneva, А.А. Kochnev

Perm National Research Polytechnic University

29, Komsomolsky prosp., 614990, Perm, Russian Federation,

tel.: (342) 219-83-67,

e-mail: kochnevaoe@mail.ru; sashakoch1@rambler.ru

The article describes the methods of production risks assessment in oil and gas industry. The definition of the "risk" concept in oil and gas industry is given. The problem of the urgency of production risks assessment is discussed on the example of an X asset. Recommendations on risk management are proposed.

Key words: risks; risks classification; causes; activities; oil production companies.

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