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ISSN 0207-2351 Scientific-technical journal published since 1965 January 2015 ¹ 1 12 issues per year
CONTENÒS |
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DEVELOPMENT OF OIL AND GAS-OIL FIELDS |
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METHODS OF PRODUCING EFFECT ON A DEPOSIT AND RAISING OIL RECOVERY |
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RESEARCH OF FORMATIONS AND WELLS |
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RESEARCH OF FORMATIONS AND WELLS |
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TECHNIQUE AND TECHNOLOGY OF OIL PRODUCTION |
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Abbasov S.G., Mamedov V.T. Study of the temperature distribution by the built-up casing string (p. 46-49) |
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GATHERING, TRANSPORTATION AND PREPARATION OF OIL, GAS AND WATER |
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Zaporozhets Eu.P., Shostak N.A. Factors that affect the growth rate of gas crystalline hydrates (p. 49-56) |
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Serkebayeva B.S. Some specific features of oil-water emulsion rheology of Uzen field (p. 57-60) |
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Information on the articles (p. 61-67) |
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Information on the articles |
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SELECTION OF WELLS-CANDIDATES FOR APPLYING THE TECHNOLOGY OF MULTI-PUMPING WELLS (ð. 4)
N.V. Fedorenko JSC "Orenburgneft" 2, Magistralnaya str., 461040, Buzuluk, Orenburg region, Russian Federation
V.N. Kozhin, I.G. Khamitov
RN−"SamaraNIPIneft"
D.K. Sagitov
NPO "Neftegaztechnologia, Ltd." 96/2, Revolyutsionnaya str., 450078, Ufa, Republic of Bashkortostan, Russian Federation, tel.: (347) 228-18-75, å-mail: npo@ngt.ru
A.N. Astakhova
VNIIOENG 14, bld. 2, Nametkin str., 117420, Moscow, Russian Federation, tel.: (495) 332-00-49
Some method of wells-candidates selection for timely application of the technology of multi-pumping by the size of current recoverable reserves, in three directions (formations isolation, ahead-of-schedule brining of reserves into development and introduction of multi-pumping and injection), based on comparison with operative assessment criteria, thus allowing full usage of the technology advantages.
Key words: multi-pumping; Vakhitovsky field; wells-candidates; profitability.
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DEVELOPMENT OF THE TECHNOLOGY PROVIDING CUT-OFF OF WATER-FLOODED INTERVALS OF A PRODUCTIVE FORMATION (ð. 8)
V.A. Strizhnev, S.A. Vezhnin
"Ufa Research-Technical Center, Ltd." 59, Aksakov str., 450076, Ufa, Republic of Bashkortostan, Russian Federation, e-mail: strijnevva@ufntc.ru
O.T. Musin
JSC "Tomskneft" VNK 23, Burovikov str., 636780, Strezhevoy-city, Tomsk region, Russian Federation, tel.: (382) 596-95-03, fax: (382) 596-96-35
T.E. Nigmatullin
"RN–UfaNIPIneft, Ltd." 96/2, Revolyutsionnaya str., 450078, Ufa, Republic of Bashkortostan, Russian Federation
The urgency of work relating to limitation of water inflow in oil wells is justified by the necessity of a productive formation development. Despite long-term experience in these works performance, their effectiveness is still quite low, and they are usually carried out with whatever funds remain. The article presents the results of work aimed at water inflow limitation that was carried out at nine wells of Sovetsky and Severny deposits of JSC "Tomskneft" VNK in 2013. The results of work performed witness the fact that wells’ average operating parameters have changed as follows: fluid flow rate decreased from 280 to 60 m3/day, oil production has increased from 4,3 to 9,6 tons/day, water-flooding has changed from 98 to 81 %. The results of this work served the basis for the authors of the present article to suggest some ways aimed at improving of the effectiveness of efforts to reduce water inflow with regard to the criteria applied for selection of wells-candidates as well as cementing compositions and their volumes.
Key words: water shut-off (WSO); cut-off of formation water-flooded intervals; polymer composition; raising efficiency of water shut-off.
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COMPARISON OF THE DESIGN AND ACTUAL FACTORS OF OIL RECOVERY BY THE VALUE OF HYDRAULIC CONDUCTIVITY FOR TERRIGENE AND CARBONATE FORMATIONS (ð. 12)
Larisa Nikolaevna Nazarova
I. Gubkin Russian State University of Oil and Gas 65, Leninsky prosp., 119991, Moscow, Russian Federation, tel./fax: (499) 507-88-88, å-mail: Nazarova-ln@irmu.ru
Evaluation of the design oil recovery factor (ORF) and possibility of its achievement was carried out in comparison with the actually obtained value of ORF as a result of the field development with the same filtration-volumetric properties (FVP) under the condition of no less than 80 % selection of the recoverable reserves. Were considered 491 formations made by a terrigenous reservoir and 197 formations composed by a pore-type carbonate reservoir were examined, viscosity of formation oil didn’t exceed 5 mPa∙s. When assessing the possibility of joining of terrigenous and carbonate formations into one object of development of reservoirs it is necessary to evaluate the possibility of getting the corresponding ORF as well. Maximum discrepancy between ORF design and actual values were obtained by the minimum values both of carbonate and terrigenous reservoirs, which made 67 % and 135 % respectively. For low FVP when ε < 10 D×m/(Pa×s), the design values appeared "undervalued" as "insurance", as well as in case of high FVP when ε ≥ 1000 D×m/(Pa×s). By ORF maximum values, the degree of divergence is less and equals to 45 % for both terrigenous and carbonate reservoirs. In case of FVP perfection when ε > 100 D×m/(Pa×s) the degree of divergence reduces and the degree of reduction is greater for terrigenous collectors. The smallest difference between the design and actual ORF is received under "good" conditions of filtration of 100 D×m/(Pa×s) ≤ ε < 1000 D×m/(Pa×s).
Key words: oil recovery factor; conductivity; flow capacity.
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RESEARCH OF CALCULATION METHODS APPLIED FOR DEFINITION OF FLOW-RATE OF A HORISONTAL WELL WITH FORMATION HYDRAULIC FRACTURING (ð. 15)
Artur Evgenievich Rastrogin
54, bld. 1, Bolshaya Polyanka str., 119180, Moscow, Russian Federation
Alexander Stanislavovich Timchuk
48, Respublika str., 625000, Tyumen, Russian Federation
Alexander Sergeevich
Samoilov,
Tyumen State Oil and Gas University 38, Volodarsky str., 625000, Tyumen, Russian Federation
High technological efficiency of hard-to-recover oil reserves extraction is achieved through performing of formation multi-zone fracturing in a horizontal sector of a well mostly due to increase of a formation coverage coefficient by drainage. However, the widespread introduction of this technology requires an objective assessment, depending on the methods applied for its implementation. This paper presents some analysis of the technical and technological results obtained during performance of multi-zone formation hydraulic fracturing under conditions of complexly-composed formation of Samotlor field. Some analytical model adapted for actual results is used to solve the problem of technical efficiency evaluation of the planned operations.
Key words: formation hydraulic fracturing; horizontal well (HW); multi-zone formation hydraulic fracturing; complexly-composed formation.
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DEVELOPMENT OF SEDIMENT-GEL-FORMING COMPOSITION TO RAISE OIL RECOVERY FACTOR OF FORMATIONS IN LOW-PERMEABLE AND HETEROGENEOUS FORMATIONS (ð. 20)
Sergey Anatolievich Kharlanov 3, Bolshaya Ordynka str., 115035, Moscow, Russian Federation, tel.: (495) 620-88-29, e-mail: skharlanov@ritek.ru
Mikhail Alexandrovich Silin, Lyubov Abdulaevna
Magadova, Vladimir Borisovich Gubanov
65, Leninsky prosp., 119991, Moscow, Russian Federation, tel.: (499) 507-83-16, e-mail: silin.m@gubkin.ru, magadova0108@himeko.ru, poteshkina.kira@yandex.ru, gubanowww@gmail.com
Vladimir Afanasievich Lebedev
CJSC MIP GU "Chimeco-Service" 63/1, Leninsky prosp., 119991, Moscow, Russian Federation, tel.: (499) 507-82-39, e-mail: ipm56@mail.ru
This article is devoted to the development of sediment-gel-forming compositions for the purpose of their application for leveling the profile of water-intake capacity of a well. Compositions containing aluminum poly-oxy-chloride and urea were taken as the basis. Some reagent that adjusts the components’ hydrolysis rate and increases the gelling time of compositions was selected for these compositions. The results of studying the dependence of gel-forming time on the temperature, thermal stability as well as values of complex viscosity, the developed compositions resistance factor are given.
Key words: sediment-gel-forming compositions; poly-oxy-chloride of aluminum; urea; complex viscosity; plugging properties.
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DETERMINATION OF FILTRATION ANISOTROPY QUANTITATIVE CHARACTERISTICA ON THE BASIS OF COMPLEX DATA OF WELLS’ GEOPHYSICAL AND HYDRODYNAMICAL STUDIES (ð. 24)
Mikhail Olegovich Korovin, Vitaly Pavlovich Merkulov
Tomsk Polytechnic University 4a, Usov str., 634034, Tomsk, Russian Federation, å-mail: korovinmo@hw.tpu.ru
Relevance of the work is justified by the necessity of obtaining the data on the heterogeneity of the pore space and filtration properties of a formation-reservoir both at the initial stage of exploration drilling and during the subsequent adjustment of the strategy development. The aim of the article is a comparative analysis of materials of geophysical and hydrodynamic well testing to assess the directions and the size of the filtration heterogeneity. Research methods include the standard set of geophysical well logs in digital log sheets applied to a productive formation compartmentalization. Petro-physical characteristics are determined by applying the dependence between the core data (porosity-permeability). One of the wells served the example for permeability distribution construction of the nearby wells by the results of tracer studies and permeability gradients distribution, based on GIS data, that was the ground for making conclusions about anisotropy distribution regularity with account of geological depositional environments, is shown on the example of Yu13 formation. This resulted in getting a confirmation of comparison of hydrodynamic and geophysical studies in terms of the permeability distribution. Correlative characteristics of filtration-volumetric parameters by cores confirm azimuth characteristics of a reservoir area.
Key words: porosity; permeability; spontaneous polarization method; permeability gradient; anisotropy; heterogeneity.
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REVEALED PECULIARITIES OF CARBONATED WATER FILTRATION ON THE BASIS OF LABORATORY EXPERIMENTS (ð. 30)
Ernest Sumbatovich Zakirov, Dmitry Sergeevich Klimov, Alexander Dmitrievich Lysenko
Oil and Gas Research Institute Russian Academy of Sciences 3, Gubkin str., 119333, Moscow, Russian Federation, tel.: (499) 135-54-67, e-mail: ezakirov@ogri.ru
The results of dynamic laboratory experiments are presented in the paper. Those results are tightly connected with oil fields development accompanied by carbonated water injection as well as with oil and gas genesis in compliance with biosphere concept of their origination. It is shown in the paper that during processes under consideration associated with carbonated water filtration in reservoir rocks large amounts of hydrogen are produced along with methane homologues. It should be stressed that laboratory experiments were conducted at low temperature and pressure conditions.
Key words: carbonated water; filtration; genesis of hydrocarbons; homologues of methane; hydrogen.
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UDC 622.276.031.011.43:550.832
SOME ASPECTS RELATING TO STUDYING THE BEHAVIOR OF HETEROGENEITY PARAMETERS DISPERSION OF PRODUCTIVE FORMATIONS IN CONDITIONSOF OIL FIELDS DEVELOPMENT IN TATARSTAN (ð. 35)
A.Yu. Gutorov
Ufa State Oil Technical University, affiliate in Oktyabrsky-city 54a, Devonskaya str., 452620, Oktyabrsky-city, Republic of Bashkortostan, Russian Federation, e-mail: gutorov70@mail.ru
The article presents analysis of the results obtained while studying various properties of oil formations in conditions of Aktash territory of Novo-Elkhovsky oilfield of JSC "Tatneft", composed by Devonian terrigene reservoirs. Both the data of the results interpretation of the conducted well logging and the information obtained during the laboratory tests were used to characterize reservoir properties of the allocated formations. The detailed statistical analysis of some specific features of the basic parameters distribution, characterizing filtration-volumetric properties of each producing formation that composes terrigene thickness of Devonian deposits within Aktash territory of Novo-Elkhovsky field is carried out. The influence of reservoir properties anisotropy of some separate individual productive inter-layers on the process of oil extraction out of them is studied. It is stated that the productive reservoirs presented by Devonian terrigene sediments have complicated geological and physical conditions caused by significant zonal and layered heterogeneity.
Key words: field; production facility; development; deposit; reservoir; horizon; formation; well; permeability; porosity; oil saturation; dissection; anisotropy; heterogeneity; dispersion.
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SOME REASONS FOR WELLS DECOMMISSIONINGIN MONOCLINAL OIL FIELDS (BY THE EXAMPLE OF SIYAZANSKY MONOCLINE) (ð. 43)
F.G. Murvatov, A.G. Kerimova, G.G. Mamedova
Azerbaijan State Oil Academy 20, Azadlyg prosp., AZ1010, Baku, Republic of Azerbaijan
The article presents the reasons for producing wells withdrawal from service and gives recommendations on the problem salvation. In the oil fields of ready application Use of ready-made long filters at oil fields essentially complicated operational conditions of producing wells. During the initial period of wells operation (even during fields’ development) there happens the products water-flooding and sand plugs formation. It is shown that due to the sand plugs field’s exploitation covers the upper inefficient part of the section. Thus, the uneven decrease in oil production in wells happens due to the failure (collapse) of well bottom zone; damage (crushing, breakage) of production casing stings occurs in case of a formation cover collapse (walls of voids) in that part of the filter, where the fluids flow.
Key words: water-flooding; corrosion; sand plug; damage of a production casing string; long filters; interval standardized filters.
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STUDY OF THE TEMPERATURE DISTRIBUTION BY THE BUILT-UP CASING STRING (ð. 46)
S.G. Abbasov, V.T. Mamedov
Azerbaijan State Oil Academy 20, Azadlyg prosp., AZ1010, Baku, Republic of Azerbaijan.
The article considers solving of the problem relating to temperature distribution in steady and unsteady heat flow in the built-up casing string. Equations of heat conductivity are used and analytical expressions for steady and unsteady heat flow that allow defining temperature distribution in the wells’ casing string are obtained.
Key words: cement ring; casing string; heat flow; rocks; heat conductivity coefficient.
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FACTORS THAT AFFECT THE GROWTH RATE OF GAS CRYSTALLINE HYDRATES (ð. 49)
Eugene Petrovich Zaporozhets, Nikita Andreevich Shostak
Kuban State Technological University 2, Moskovskaya str., 350072, Krasnodar, Krasnodar region, Russian Federation, å-mail: zep1945@inbox.ru, nikeith@mail.ru
Development of the new and updating of the existing technologies that provide prevention of formation and growth of natural and petroleum gases hydrates in the systems of production, collection, preparation, transportation and processing required some systematic approach to studying of the factors that affect their kinetics. The main factors that influence hydrates’ growth were selected and systematized in the paper on the basis of experimental studies’ data presented in more than fifty works (out of which the article has references to forty works). The main factors are analyzed in terms of their kinetics. Classification of these factors is developed on the basis of the review and analysis.
Key words: gas crystalline hydrates; hydrates’ growth rate; factors; barbotage; turbulence in the system; heat transfer; physical fields.
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SOME SPECIFIC FEATURES OF OIL-WATER EMULSION RHEOLOGY OF UZEN FIELD (ð. 57)
Bazargul Serkebaevna Serkebayeva
JSC "KazNIPImunaygaz" 2, 6 microdistrict, 130000, Aktau, Republic of Kazakhstan, tel.: (729) 221-10-63, fax: (729) 247-02-80, å-mail: Serkebayeva_B@kaznipi.kz
The challenge of combating oil emulsion is one of the most important ones among numerous technical problems related to the conservation of natural resources in the oil industry. The present article accentuates the main focus on the rheological characteristics of emulsions behavior the research of which is necessary to increase efficiency during storage, transportation and processing of such systems. The aim of this work is to study the influence of water content on the rheological properties of the of oil-water emulsions of Uzen field. While analyzing oil-water emulsions the author of the present article comes to the conclusion that emulsions are formed under variety of oil and water ratios, but the maximum capacity for emulsification meets only some definite ratio. Experimental work was carried out in the temperature range from 20 to 50 °C. Flow curves were firstly recorded for the water-free oil of Uzen field, then for oil that was water-flooded by 10…90 %. It is shown that at high temperatures oil from Uzen field behaves as a Newtonian fluid. If the temperature is lower than 40 °C oil viscosity increases, its abnormally viscous properties become obvious due to the crystallization and concentration increase of paraffins in the volume of oil. Graphs showing rheological dependences of viscosity on shear rate for emulsions with various content of oilfield water content (10 to 90 %) at different temperatures (from 20 to 50 °C) are submitted.
Key words: oil emulsion; rheological characteristics; water-flooding; emulsification; anhydrous oil; crystallization of paraffins; shear rate; apparent viscosity.
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JSC "ALL-RUSSIAN SCIENTIFIC-RESEARCH INSTITUTE OF ORGANIZATION, MANAGEMENT AND ECONOMICS OF OIL AND GAS INDUSTRY" |