Oilfield Engineering

Hydrodynamic modeling of deposits, confined to the fracture-pore reservoirs is a complex and urgent problem. The use for this purpose special software, in some cases, is difficult due to insufficient core material of the deposits. So, when hydrodynamic modeling Famennian deposit development of Ozernoe field, complicated by occurrence of the developed fractured area of the reservoir, there appeared difficulties with the adaptation of wells development history. With this fact in mind, modification of permeability values, based on the data of processing of pressure recovery curves by Warren – Ruth method is carried out at the first stage in the area of fracture development. At the next stage permeable cracks with zero porosity and permeability comparable with that of pore reservoirs were introduced in the model of fractures intervals. This technique is implemented by the example of more than 20 wells, greatly increased the adaptation of Famennian deposit model of Ozernoe field and can be recommended for practical use in similar geological and technological conditions.

Key words: carbonate reservoir; fracturing; hydrodynamic studies; Warren – Ruth method; permeability; hydrodynamic model; permeability modification; adaptation of the model.

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UDC 622.276.1/.4

ASSESSMENT OF POSSIBILITY OF REPEATED PUTTING

INTO DEVELOPMENT OF LONG-TIME PRESERVED FIELDS

WITH HIGH-VISCOSOUS OIL (р. 8)

Avaz Khamidillaevich Agzamov,

Abdukhoshim Khuzhakulovich Karshiev

Tashkent State Technical University

2, Universitetskaya str., 100095, Tashkent, Republic of Uzbekistan,

e-mail: abduhoshim82@mail.ru

The paper presents the results of research of influence of Uchkizil field long-time preservation on oil recovery factor. The repeated renewal of the field development resulted in decrease of the wells’ production average water-flooding. The researches proved the fact that this phenomenon was promoted by also the decrease (limitation) of liquid withdrawal rates. In many researches the efficiency of repeated putting into development of wells and deposits which were in a long-time preservation because of wells production high water-flooding, is calculated on the basis of indicators comparison of wells operation at the moment of their shut off and after the production renewal. The results of the researches made it possible to prove the fact that the greatest effect after the repeated putting of fields, which were in a long-time preservation, into development can be expected from highly-permeable, hydro-dynamically connected formations of big thickness with low-viscous oil and a big difference of water and oil density. The paper assesses the influence of Uchkizil field’s repeated putting into development on the final coefficient of oil recovery. The conducted researches and the corresponding calculations showed that not all indicators of geological-physical conditions of Uchkizil field correspond to the criteria of effective use of the repeated development technology.

Key words: field; stage; withdrawal rate; preservation; water-flooding; reserves; oil recovery coefficient; technology; viscosity; development; well; replacement; effect.

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UDC 622.276.1/.4:622.276.43

DETERMINATION OF CONDITIONS OF HOT WATER-FLOODING

WHEN DEVELOPING HIGH-VISCOUS OIL DEPOSITS OF PORE TYPE COLLECTOR

CONDITIONALLY HOMOGENEOUS BY PERMEABILITY (р. 12)

I.V. Vladimirov, E.M. Almukhametova, E.M. Veliev

Ufa State Oil Technical University

1, Kosmonavtov str., 450062, Ufa, Republic of Bashkortostan, Russian Federation,

e-mail: igorv@ufamail.ru, elikaza@mail.ru

At present, the decision to use thermal methods of oil recovery enhancement is made on the basis of laboratory experiments. However, it is necessary to transfer these "local" data to the real object. How should the results, obtained by means of a formation miniature model, rather homogeneous by its properties, be compared with a macro object, which is significantly different from a laboratory model? The authors attempted to do this with the help of a hydrodynamic model, which on the one hand contains the laboratory research data and on the other – simulates reservoirs macro properties. The paper presents the results of hydrodynamic calculations with showed the possible variety of the results of applying thermal methods of oil recovery enhancement.

Key words: thermal methods; enhanced oil recovery; conditionally homogeneous formation; reservoir of pore type.

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UDC 622.276.65

MODELING AND SUBSTANTIATION OF SELECTION

OF TEMPERATURE MODE PARAMETERS OF A FORMATION

WHEN INJECTING HEAT CARRIER (р. 19)

G.E. Imangalieva, G.Sh. Doskaziyeva, O.Sh. Tulegenova

Atyrau Institute of Oil and Gas

45a, Baimukhanov str., 060027, Atyrau, Republic of Kazakhstan,

e-mail: Gulnar-imangalieva@mail.ru, Doskaziyeva.gulsin@gmail.com, olympiada70@mail.ru

The article describes the processes of oil displacement with account of temperature complex effect on molecular surface forces, fluids viscosity and formation system expansion. Oil displacement processes are conducted by means of mathematical models developed for a linear formation.

Key words: oil displacement by heat carriers; temperature; molecular surface forces; the fluids viscosity; expansion of a formation system; non-isothermal and isothermal zones; formation productivity; formation thickness; oil viscosity.

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UDC 622.276.1/.4(574):622.276.6

OIL RECOVERY ENHANCEMENT IN MANGYSHLAK FIELDS (р. 23)

Gulnara Dyusenovna Tulesheva

JSC "Kazakh Scientific-Research and Design Institute of Oil and Gas" (JSC "KazNIPImunaygas")

2, micro-district 6, 130000, Aktau, Mangistau region, Republic of Kazakhstan,

e-mail: Tulesheva_G@kaznipi.kz

Olga Bertovna Saenko

JSC "Scientific-Research Design Institute of Oil and Gas (JSC "NIPIneftegaz")

40, micro-district 8, 130000, Aktau, Mangistau region, Republic of Kazakhstan,

e-mail: olga.saenko@nipijsc.kz

The paper presents the key criteria of different technologies applied for oil recovery enhancement and their brief description as well as development conditions of oil reserves in main Mangyshlak fields. Flow diverting technologies (FDT) are updated, new technologies for Kazakhstan such as water-gas stimulation of a formation (WGS) as well as horizontal drilling (HD) and others are getting ready for implementation, thus allows the region to remain its active positions. Terms of the effective application of the flow diverting technology (FDT) when developing productive formations of Zhetybai oil and gas field are given. FDT efficiency is analyzed, followed by its further perfection; Yu-8 horizon of Zhetybai field is taken as an example for consideration. Practically all fields of Mangyshlak according to their geological characteristics (reserves, depths, collector structure, reservoir fluid properties, etc.) are different and complex; they are characterized by hard-to-recover reserves and low oil recovery factor. Some new approach, envisaging the necessity of oil and gas fields’ development by formation pressure maintenance not lower than saturation pressure, is proposed. However, a field’s development by producing wells operation with wells bottom pressure lower than saturation pressure is effective in certain conditions. Thus, it is proposed to provide the conditions of effective development of an oil and gas field at 7 > μ_res.

Key words: flow diverting technologies (FDT); horizontal technologies (HT); water gas stimulation (WGS); selective systems of increased pressure; injective capacity limitation and water inflow isolation; cyclic water-flooding; methods of treatment of a well bottom area of a formation; forced withdrawals.

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UDC 622.276.64

SELECTIVE MICELLAR SOLUTION

TO ENHANCE HIGH-VISCOUS OIL PRODUCTION AND

WATER INFLOW CONTROL (р. 31)

Ksenia Igorevna Babitskaya,

Igor Vladimirovich Tsarkov,

Viktor Viktorovich Konovalov

Samara State Technical University

244, Molodogvardeiskaya str., 131000, Samara, Russian Federation,

е-mail: babitskayaki@gmail.com, tsarkov.igor.samara@gmail.com, konovalov-samgtu@yandex.ru

The paper presents the results obtained while studying characteristics of a new composite reagent developed to enhance oil recovery, to reduce oil viscosity and to limit water inflow to a well. The action of the developed formulation (a micellar solution) is based on the change of its rheological properties when mixed with saltwater and high-viscous oil, which is achieved by an optimal combination of anionic, nonionic and zwitterionic surfactants. The studies of the reagent’s composition viscosity changes during its contact with formation water and high-viscous oil are carried out, the results of its filtration testing on the model of water- and oil-saturated core as well as core with residual oil saturation are presented. The laboratory study results showed that the developed micellar solution possesses selective properties, that is being injected into water-flooded oil formations it stimulates the oil inflow from oil-saturated inter-layers and restrains the water inflow from water-saturated ones thus providing leveling the inflow profile.

Key words: micellar solution; surfactants; oil recovery enhancement; water control; inflow profile leveling; rheological properties; filtration tests.

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UDC 622.276.63

LABORATORY RESEARCH OF VISCOUS PROPERTIES OF ACID COMPOSITION

WITH GELLING AGENT ADDITIVES (р. 35)

Yury Veniaminovich Zeigman

Ufa State Petroleum Technological University

1, Cosmonavtov str., 450062, Ufa, Republic of Bashkortostan, Russian Federation

Vitaly Vyacheslavovich Sergeev

Skolkovo Institute of Science and Technology

3, Nobel str., Skolkovo Innovation Center, 143026, Moscow, Russian Federation,

e-mail: vsmyn23@gmail.com

Results of laboratory experiments on the effect of different gelling agents on viscosity properties and thermal stability of the gelled acid compositions are presented in the paper. The experiments resulted in determining the most efficient gelling agents of the presented ones; optimum mass fraction of a gelling agent in acid compositions; thermal stability of compositions. Dynamics of an acid composition viscosity increase when introducing gelling agents is analyzed. Summary graph of dynamics of compositions viscosity increase is built. It is stated that the most effective gelling agents among the tested ones provide increase of the acid composition viscosity in the range from 2,4 to 8,0 times at 20 °C. Widespread water-based composition (20 % mass fraction of hydrogen chloride, 1115 kg/m³ density and 1,37 mm²/s viscosity) was used as the basic acid composition.

Key words: acid composition viscosity; laboratory research; thermal stability; gelling agent mass fraction.

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UDC 550.832.6

ANALYSIS OF NONSTATIONARY THERMOMETRY IN WELLS

WITH HYDRAULIC FRACTURING OF A FORMATION (р. 38)

H.Z. Musaleev, S.I. Melnikov

Gubkin Russian State University of Oil and Gas

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

e-mail: Musaleev.HZ@gazprom-neft.ru

The paper deals with the construction of a numerical model with the solution of problems of non-stationary thermometry. Heat and mass transfer in the producing wells has definite specificity. Besides conductive and convective heat exchange, thermodynamic processes that are associated with the release (or absorption) of heat, especially throttling and adiabatic, significantly affect on the temperature distribution in the well bore and the surrounding rocks. While analyzing the specific features of the various thermodynamic processes, the authors of the paper came to some important conclusions in view of information content of the non-stationary thermometry. Hydraulic fracturing, followed by fixing the fracture by proppant, has a significant impact on the behavior of the pressure and temperature fields in the well. Development of field-geophysical monitoring technologies (FGM) facilitates the transition from one-off studies to continuous on-line monitoring by stationary information and measuring systems mode (SIMS). For example, in recent years, pressure measurements at the inlet of an electric submersible pump (ESP) by the sensors of thermal metric systems (TMS) have become widely used for data interpretation obtained during hydro-dynamic well testing (HDWT) when putting a well into operation. Distributed fiber optic sensors (DTS) or dot-distributed thermo-baric braids allow continuous monitoring of pressure and temperature fields in the well bore. The complex analysis of a production well operation with a crack that was got in the course of hydraulic fracturing of a formation resulted in development of the method applied for estimation of the fracture length and based on the data of field-geophysical researches.

Key words: thermometry; crack got in the course of hydraulic fracturing of a formation; pressure and temperature field in a well; thermodynamic processes.

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UDC 622.276.53.054.22

IMPROVING THE EFFICIENCY OF USE WELL EQUIPPED SRP (р. 45)

A.A. Kurmashov, R.S. Garifullin, L.M. Akhmetzyanov, I.N. Garipov

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

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

e-mail: ahmetzyanovlm@almet.tatneft.ru

In the process of mechanized method of oil production downhole sucker rod pumping units there are a number of technical problems that have a major impact on the operating efficiency of extraction wells and as a whole on the volume of oil production. These issues include: 1) the imperfection of the existing structures of valves for venting gas from the annulus of oil wells on tubing in the wellhead; 2) lack of ability of the technological research on the measurement of the degree of utilization of land drives SRP equipped shtangovrashchateli; 3) intensive wear Packing for because of damage to the working surface of the polished rod; 4) oil passes on the drive gear in the operation of pumping units (a large-scale problem).

Key words: an elevator valve; Tubing coupling; tube holder; SRP drive; clip; shtangovrashchateli; traverse; cable suspension; wellhead rod; load sensor; BC screw; pumping unit; reducer.

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UDC 622.245.422

IMPROVING WELL CEMENTATION

BY FIBRE PLUGGING MATERIAL (р. 53)

Ramiz Alievich Gasumov,

Yulia Sergeevna Minchenko

JSC "SevKavNIPIgaz"

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

e-mail: svnipigz@gazprom.ru, MinchenkoYS@scnipigaz.ru

Fibre cement stone of improved strength and fracture strength is formed at hardening of grouting mortar with fiberfill. Influence of basalt and polypropylene fibre to deformaton properties of cement stone are examined.

Key words: cement stone; disperced reinforcement; basalt fibre; polypropylene fibre; fracture strength; fragility; deformation.

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UDC 620.193.01

METHODICAL APPROACHES FOR LABORATORY TESTS

OF CORROSION INHIBITORS IN THEIR CHOICE

FOR INDUSTRIAL USE (р. 58)

Evgeniy Anatolyevich Sosnin,

Tatyana Anatolyevna Syur

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

29, Sovetskoi Armii str., 614066, Perm, Russian Federation,

e-mail: Evgeniy.Sosnin@pnn.lukoil.com

The actual test methods for corrosion inhibitors have several disadvantages to determine the efficiency of inhibitors relative to local corrosion (LC) – a major cause of premature failures of pipelines and oil field equipment. Because of this technique of determining the protective effects of inhibitors relative to LC was developed. The gist of the method: according to corrosion monitoring data the maximum rate of the LC on oil facilities is defined. Based on the maximum rate of LC in galvanostatic mode corresponding anode current is set, at the same time the potential of LC is setting. Thus, the evolution of corrosion ulcers is simulated. At the LC potential in potentiostatic mode current is measured before and after the injection of the inhibitor, and protective effect relative to LC is calculated. The validity of the proposed method was confirmed by corrosion monitoring and microscopic studies.

Key words: local corrosion; corrosion inhibitors.

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