Oilfield Engineering

Due to the development of highly-productive collectors, the share of hardly-recoverable reserves in Russia is constantly growing and currently makes nearly 60 %. The problem of profitable production of hardly-recoverable oil reserves is becoming increasingly important. The paper considers some technique of recovery of hardly-recoverable oil reserves by the example of achimov deposits of Tagrinsky oil and gas-condensate field. The basic problems, understanding of which will allow to optimally select technologies and techniques of formations stimulation as well as to avoid a significant range of problems arising during extraction of hardly-recoverable reserves from the deposits of achimov stratum in the future, are shown. The main reasons for non-compliance of injection volumes and the deposit energy state are identified. It is shown that a formation water-flooding, especially at the water infiltration front line, is of a layered nature while the layered nature of the formation water-flooding largely depends on the hydrodynamic connection of reservoirs. Recommendations on further development of achimov deposits of Tagrinsky oil and gas-condensate field are submitted.

Key words: hardly-recoverable oil reserves; reserves recovery; achimov deposits; oil; technology; suite; heterogeneity; reservoir.

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UDC 622.276.1/.4.001.57

COMPREHENSIVE EVALUATION OF OIL PRODUCTION POTENTIAL GROWTH

AT THE OIL FIELDS OF JSC "SAMARANEFTEGAS" RESULTING FROM ADDITIONAL

PERFORATIONS OF BOTTOM WATER-DRIVE RESERVOIRS (p. 10)

К.Е. Buyakova, Е.К. Solozhenkina, I.G. Khamitov, A.E. Manasyan

LLC "SamaraNIPIneft"

18, Vilonovsky str., 443010, Samara, Russian Federation,

tel.: (846) 205-86-00,

e-mail: KirjanovaEV@samnipineft.ru

The paper considers possibilities of oil production increase at the oil fields of JSC "Samaraneftegas" through the arrangement of additional perforations of bottom water-drive reservoirs. In practice the main method to control coning effect is the arrangement of 30…50 % perforations of pre-roofed oil-saturated area of the reservoir, whereby the low rates of product reserves recovery were not provided thus bringing the premature wells’ water-flooding. The authors demonstrate the potential of oil production growth by 30 % with full perforation and partial penetration into water-saturated area of the reservoir (reverse coning) to provide for the most effective process of oil reserve recovery. The Southern group of JSC "Samaraneftegas" oil fields (60 fields) serves the example of costs evaluation spent on reconstruction of surface facilities due to water production growth by 1,5…2,0 times. It is shown that in the present-day economic situation the recommended measures are relatively low-costed and effective to maintain the current levels of oil production.

Key words: bottom water-drive reservoir; water-coning; additional perforation; integrated project.

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UDC 622.276.1/.4"712.8"

COMPARISON OF THE METHODS APPLIED TO ANALYZE

THE RESIDUAL RESOURCES RECOVERY (p. 14)

A.V. Arzhilovsky, D.N. Guseva

"Tyumen Petroleum Research Center, Ltd."

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

e-mail: avivanova@rosneft.ru

Orenburg territory deposits serve an example of considering three methods applied to analyze the localization of residual stocks: cells water-flooding; schemes of filtration flows direction and assessment of correlation among wells applying Spearman and Kendall methods of mathematical statistics. Presence of individual weakly-drained areas in the deposits not subjected to the reserves recovery is revealed. One of the causes of such areas occurrence is the lack of interaction between the production and injection wells. That can happen due to unproductive water injection: outside the oil-bearing contour as well as in a reservoir washed zone, the circulation of water in the reservoir without the desired effect on oil displacement. Changing of this situation will allow to involve previously non-drained areas in the development, to increase the profitability of production, to reduce the cost of reservoir pressure maintenance (RPM) system, to extend the operational life of oil deposits as well as to increase the oil recovery factor.

Key words: residual reserves; weakly-drained areas; oil-bearing contour; profitability of production; oil recovery factor.

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UDC 622.279.23/.4

INNOVATIVE SOLUTIONS TO ENSURE PROJECT LEVEL

OF GAS PRODUCTION (p. 20)

Ramiz Alievich Gasumov,

Eldar Ramizovich Gasumov

JSC "North-Caucasus Scientific-Research Project Institute of Natural Gases" (JSC "SevKavNIPIgaz")

419, Lenin str., 355035, Stavropol, Russian Federation,

tel.: (865) 256-30-26,

е-mail: Priemnaya@scnipigaz.ru

The paper discusses the quality perfection of hydrocarbon fields’ development through the use of a set of innovative approaches aimed at providing gas production at the project level and improving the efficiency of a wells fund operation. The problems that complicate the work of gas production objects are analyzed. The purpose, tasks of geological-technical measures (GTM), being the integral part of the control system over fields development, are defined. The main types of activities, comprised by GTM complex, are considered. It is shown that the efficiency of carrying out geological and technical measures depends on the innovative components that reflect the share of innovative production and innovation profit in a gas company’s total amount, that is the innovations implementation when projecting should be technologically feasible and economically profitable. It is determined that the main functions of GTM control systems are planning, organizing, controlling and accounting. With account of the fact that the implementation of innovative approaches in the projects is always accompanied by certain risks associated with specific features of wells, being a complex engineering structure, the risk factors should be taken into consideration and predicted at the planning stage. The necessity of development and implementation of innovative technical solutions which allow enhancing recovery of gas fields, being at the latest stage of their development, and making the basis of the program of commercial objects reconstruction is proved.

Key words: gas production; gas field; well; project of a field development; reliability of operating wells fund; effective operation of a field; geological and technical measures; reconstruction of production objects; innovation; implementation of innovations.

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UDC 622.276.66.013

EFFICIENCY ENHANCEMENT OF THE TECHNOLOGY OF A FORMATION

HYDRAULIC FRACTURING IN A CARBONATE-TYPE COLLECTOR (p. 28)

Artur Nikolayevich Koltyrin

"PermNIPIneft", branch of LLC "LUKOIL−Engineering" in Perm

29, Sovyetskaya armiya str., 614066, Perm, Russian Federation,

tel.: (342) 233-63-44,

е-mail: Veronika.Ammosova@pnn.lukoil.com

The acid hydraulic fracturing of a formation (AHFF) was earlier used in the carbonate fields of Perm region. For the first time a carbonate reservoir was subjected to proppant hydraulic fracturing in 2014. It showed higher efficiency than acid fracturing. It is noted that to provide proper gel destruction after proppant fracturing it is recommended to use acid treatments that allow increasing oil potential flow-rate growth.

Key words: carbonate reservoir; proppant fracturing; acid fracturing; acid treatments.

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UDC 622.276.1/.4.001.57:622.276.6 Пр.М

MODELING OF INJECTION OF SEDIMENT-GELLING COMPOSITION

AT A SITE OF SAMOTLOR FIELD (p. 31)

D.V. Tolstolytkin, A.V. Baranov

"Tyumen Petroleum Research Center, Ltd."

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

e-mail: AYStovboun@rosneft.ru

The paper is a continuation of the researches related to modeling of flow-diverting technologies in Samotlor field. The paper presents the results of modeling of sediment-gelling composition injection at a site of Samotlor field and specific features of hydrodynamic calculations.

Key words: hydrodynamic modeling; flow diverting technologies; rain-compounds; gel-forming composition; EOR simulation; Samotlor field.

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UDC 622.276.66.001.57+622.276.346

CONSIDERATION OF THE IMPACT OF FRACKTURES DEVIATION

FROM THEIR PERPENDICULAR POSITION TO A HORIZONTAL WELL

ON THE LIQUID FLOW RATE FOLLOWING A MULTI-STAGE

HYDRAULIC FRACTURING (p. 37)

S.V. Elkin, A.A. Aleroev, N.A. Veremko, M.V. Chertenkov

LLC "LUKOIL−Engineering"

3, bld. 1, Pokrovsky boul., 109028, Moscow, Russian Federation,

e-mail: Sergey.Elkin@lukoil.com, Aslanbek.Aleroev@lukoil.com, Nikolaj.Veremko@lukoil.com,

Mikhail.Chertenkov@lukoil.com

The paper presents the model of fluids inflow towards hydraulic fractures as well as suggests the formulas to calculate a horizontal well’s flow-rate with multi-stage hydraulic fracturing of a formation in relation to the number of fractures with account of their deviation from the normal. Now there is a lack of knowledge on the influence of the fracture direction deviation from the normal towards the horizontal part of the well on the well’s flow-rate. Some papers suppose that the hydraulic fracturing leads to the additional tension in the formation, which, in its turn, brings deviations of the subsequent cracks of the formation hydraulic fracturing. The necessity of the inflow calculations in case of a fracture deviation, caused by certain errors of the main tension determination when designing, defined the choice of the improvement for the formulas direction improvement when calculating the flow-rate. The present paper provides the dependences of a horizontal well’s flow rate on the fractures directed at different angles other than the normal up to the direction, which completely coincides with the direction of the well. The unexpected result of the calculations lies in the following: a considerable turn of the crack (about 45°) gives an insignificant increase or a decrease of the flow-rate (about 10 %), and at some number of fractures the flow-rate doesn't depend on the turn angle at all. So, in case of occurrence of 8 fractures per each 1000 m of the well’s horizontal section and the fracture’s semi-length of 50 m, the flow-rate’s variance amounts only to a fraction of a percent and at the existing levels of errors can be considered invariable.

Key words: multi-stage hydraulic fracturing of a formation; plane-parallel flow; drainage boundary; hydraulic fractures interference.

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UDC 622.276+553.98.061.4

SPECIFIC FEATURES OF LABORATORY STUDYING

OF CARBONATE RESERVOIR ROCKS WITH DIFFERENT TYPES

OF WETTABILITY (p. 43)

Irina Pavlovna Gurbatova,

Sergey Viktorovich Melekhin,

Denis Borisovich Chizhov,

Yulia Vladimirovna Fairuzova

"PermNIPIneft", branch of LLC "LUKOIL−Engineering" in Perm

29, Sovetskaya Armiya str., 614000, Perm, Russian Federation,

tel.: (342) 717-01-54,

e-mail: Denis.Chizhov@pnn.lukoil.com

The article presents the technique of recovery of a core’s surface properties when preparing for laboratory researches. The results of studying of rocks wettability indicator on the samples with the natural oil saturation, the extracted samples and the samples with the recovered surface properties are given. The assessment of the impact of the process of the rocks’ surface properties regeneration and its duration on the results of laboratory researches, in particular, on the nature of the saturation parameter dependence on water saturation and wettability of a rock surface is submitted.

Key words: core; carbonate collector; surface properties; saturation parameter; wettability recovery.

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UDC 622.276.031.011.433:550.822.3

RESEARCH OF PERMEABILITY BUILD-UP

OF A PRODUCTIVE FORMATION MODEL OF OIL FIELDS

AFTER STIMULATION BY LILLING LIQUID (p. 47)

Alexey Viktorovich Pesterev,

Dmitry Nikolaevich Mezentsev,

Evgeny Viktorovich Tupitsyn,

Vladimir Viktorovich Evseev

JSC "Tomsk Scientific-Research and Project Institute of Oil and Gas" (JSC "TomskNIPIneft")

72, Mir prosp., 634027, Tomsk, Russian Federation,

e-mail: MezentsevDN@nipineft.tomsk.ru

The wells’ cores of Tomsk region oil field were used for carrying out the filtration experiments of modeling of a well killing by the Cenomanian horizon water with surfactants addition. The dependence of the permeability build-up coefficient on the specific surface of the filtering pores is identified. The reasons for oil permeability decrease after the killing operation are revealed.

Key words: core samples; filtration studies; killing fluid; specific surface.

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UDC 622.276

EFFICIENCY RAISE OF CONTROLLED DIRECTIONAL GAS LIFT WELLS

(p. 53)

Tulparkhan Sharabudinovich Salavatov,

Hajan Kuli Hajiyev,

Sakhar Mouazemineya

Scientific-Research Institute "Geo-technological Problems of Oil, Gas and Chemistry"

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

e-mail: petrotech@asoiu.az, hacan.hacisоy@gmail.com, Selda_shirin@yahoo.com

The paper presents the results of research of acoustic field effect on operational efficiency of controlled directional gas-lift wells. It was found that impulse impact on gas-liquid flow leads to the increase of gas phase dispersion and maintenance of its structure over the entire length of the directional lifting string. Presumably, this happens due to dispersion of large gas bubbles in the liquid, their order and improvement of hydraulic characteristics of gas-liquid flow. Field tests were conducted in the curved profile wells, with decrease of wells’ oil production rate and increase of working agent overrun. To improve the effectiveness of this measure, the principle of repeated (5-10 times) impulse action on gas-liquid flow through instantaneous cut off the flow line and subsequent measurements of growth of the well’s head pressure, flow rates of oil and water was applied. The duration of pulsed discharge of the wells under consideration ranges from 10 to 40 minutes. Time of the repeated impact is determined by the quick control over the work of the well (measurement of oil flow-rate).

Key words: controlled directional gas-lift wells; acoustic field; ultrasonic frequency; gas-liquid flow; pulsed discharge.

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UDC 622.276.6

ANALYSIS OF NON-STATIONARY WATER-FLOODING ON THE RESULTS

OF WELLS’ HYDRODYNAMIC RESEARCH (p. 55)

I.V. Vladimirov

CJSC "Concord"

10, bld. 3, Dmitrovsky proezd, 117422, Moscow, Russian Federation,

e-mail: igorv@ufamail.ru

E.M. Almukhametova

Ufa State Petroleum Technological University, branch in Oktyabrsky-city

54a, Devonskaya str., 452620, Oktyabrsky-city, Republic of Bashkortostan, Russian Federation,

e-mail: elikaza@mail.ru

R.R. Varisova

Ufa State Petroleum Technological University, branch in Sterlitamak-city

2, Oktyabrya prosp., 453118, Sterlitamak-city, Republic of Bashkortostan, Russian Federation

Change of injection wells impact in case of non-stationary water-flooding leads to considerable change of physical parameters of collectors’ water-flooding. Under the developed water-flooding regime there occurred water-flooded channels, where preferential movement of the injected water takes place. Change of the order of a group of injection wells’ putting in or off the operation leads to high-viscous oil overflow into the water-flooded channels thus affecting the results of wells hydrodynamic testing (HDTW). On the basis of the HDTW analysis before and after the change of non-stationary effects mode, the paper shows that this change leads to an increase of average showings of hydraulic conductivity and decrease of piezo-conductivity.

Key words: reservoir; non-stationary water-flooding; hydrodynamic studies of wells; hydro-conductivity; piezo-conductivity; the change of filtration flow direction; high-viscous oil.

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UDC 622.279.5(211)

USE OF HEAT-INSULATED LIFTING PIPES

TO PROVIDE WELLS’ EFFICIENT OPERATION IN PERMAFROST (p. 58)

Nona Viktorovna Seregina

"Gazprom VNIIGAZ, Ltd."

POB 130, 115583, Moscow, Russian Federation,

е-mail: N_Seregina@vniigaz.gazprom.ru

During the construction, operation and repair of wells located in the areas of permafrost, there occur various complications: permafrost thawing and destruction; ground fall and subsidence; armatures bend; casing strings collapse, etc. It is necessary to develop new technological solutions to ensure reliable operation of wells. The use of heat-insulated lifting tubing with different types and thickness of insulation in wells’ structures will prevent permafrost thawing in the wells’ near-zone. The paper presents calculation of the required heat-conductivity coefficient of lifting tubing thermal insulation for a well’s given structure with its continuous operation within 30 years without permafrost thawing in the near-well’s zone close to a Polar field conditions (Lower Cretaceous and Cenomanian).

Key words: permafrost; well; design; heat-insulated lifting tubing; coefficient of thermal conductivity and thermal insulation.

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UDC 502.55:622.276.5

ECOLOGICAL ASPECTS OF SHALE HYDROCARBONS DEVELOPMENT (p. 61)

Margarita Pavlovna Yurova

Institute of Oil and Gas, Russian Academy of Sciences (IPNG RAS)

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

e-mail: mpyurova@mail.ru

The article provides information on the environmental consequences of shale hydrocarbons development, based on the U.S. experience, and prospects for shale hydrocarbons production in other countries.

Key words: ecology of shale hydrocarbons development; vertical and horizontal "cluster" drilling; hydraulic fracturing of formations; water resources; logistics.

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