SOCAR Proceedings

SOCAR Proceedings

Published by "OilGasScientificResearchProject" Institute of State Oil Company of Azerbaijan Republic (SOCAR).

SOCAR Proceedings is published from 1930 and is intended for oil and gas industry specialists, post-graduate (students) and scientific workers.

Journal is indexed in Web of Science (Emerging Sources Citation Index), SCOPUS and Russian Scientific Citation Index, and abstracted in EI’s Compendex, Petroleum Abstracts (Tulsa), Inspec, Chemical Abstracts database.

B.A.Suleimanov, E.M.Abbasov (“OilGasScientificReseachProject” Institute)

Bottom-hole pressure build-up at filtration of gassed liquid with allowance for slippage effect


Results of bottom-hole pressure build –up at filtration of gassed liquid with allowance for slippage effect at noninstantaneous liquid inflow stopping are shown in the article. Analytical solution of stated problem was obtained. Results of numerical calculation according to obtained theoretical relatienships are given. And it is shown that at the presence of slippage effect pressure build-up curves are described by exponent sum (time for pressure build-up is decreased) while at absence of slippage they are discribed by exponential dependence. Obtained analytical solution is in a good agreement with experimental and field data.

DOI: 10.5510/OGP20100300028

E-mail: elxan.abbasov@ socar.az


Phan Ngoc Trung, Nguyen The Duc (Vietnam Petroleum Institute)

Optimizing injection and production allocation in multi -wel water -floding project using optimization algorithms and artificial neural network


Efficiency of oil production process using water injection to maintain reservoir pressure is strongly depend on allocation of injection and production rates among the wells. The first part of paper presents principle and mathematical basis for application of optimization algorithms and Artificial Neural Network (ANN) in combination with reservoir simulator for problem of well rate reallocation to minimize water cut. The remaining part of the paper presents our study for evaluating effectiveness of several conventional optimization algorithms and the feed-forward back-propagation ANN. These different solution methods have been used for the same optimization problem with a synthetic reservoir model. The improvements of objective function have been obtained with all the methods. The comparison of obtained results also shows advantages and drawbacks of the methods. The study has already shown the capability of optimization algorithms and ANN in solving the problem of optimizing allocation of injection and production rates in multi-well water-flooding projects.

Keywords: water flooding, optimization algorithm, well rate allocation, artificial neural network, water cut.

DOI: 10.5510/OGP20100300029

E-mail: trungpn@vpi.pvn.vn


S.I.Hrymus (BelNIPIneft)

Features of formation of structure of a filtrational stream in the top part of a cut reservoir oil deposits at water gas influence


In this paper, the author considers some features of seepage structure of development sheet oil deposit made by traditional waterflooding and using Water-Alternating-Gas. This paper assesses the application efficiency of Water- Alternating-Gas when used within the top of a sheet oil deposit. Virtual models of a stratum with heterogeneous permeability and a hydrodynamic model of a real object show that a particular useful effect of such an application is achieved largely due to the gravity force, where a rising gas effectuates the displacement of oil.

DOI: 10.5510/OGP20100300030

E-mail: s.grimus@beloil.by


D.Zh.Akhmed-Zaki (Al-Farabi Kazakh National University)

About one problem of biphase filtration of mix in porous media with thermal influence


In the article considering questions of mathematical modeling nonisothermal filtration process in the porous media in case of fully velocity of a mix ν = ν(t) is given. The computational algorithm is constructed and analysis of calculations of displacement modelling problem made based on Muskate-Leverett equations system. The general technique of estimation and analysis of thermal filtration in near well-boring offered by results of numerical calculations which is especially important at development of oil and gas fields.

DOI: 10.5510/OGP20100300031

E-mail: darhan_a@mail.ru


A.A.Mammadov (“OilGasScientificReseachProject” Institute)

New approach to problems of spent well cutting toolls recovery


Hundreds of dimension-types of intrawell cutting tolls are applied at renovation of oil-and-gas wells as well as elimination of the most complex failures. However their famine in oil-field facilities is obvious. Our investigations show that in foreign countries technology of intrawell cutting tolls recovery is known and applied in industry. However there is no information about the thickness of layer put on a damaged section of cutter, its best performance, and efficiency of reconstructed tool. The article provides a s ience-based solution of the above tasks and shows the possibility to directly
apply them in industry.

DOI: 10.5510/OGP20100300032

E-mail: аladdin_ma@mail.ru


F.K.Hasanov (“OilGasScientificReseachProject” Institute)

Research of tensional deformation state of cylindrical oil tanks


Method of oilfield tank calculation taking into account physical non-linearity of material and boundary conditions of support is suggested in the article. Efficient procedures is developed on the basis of finite differences methods. On the base of developed procedures computational algorithm is created, complex of applied programmers is made up. Analysis of computation results on the basis of calculation procedures showed that solution of shells stressed and deformed state problems should be carried out taking into consideration of physical non-linearity. According to computation results concrete formulas and graphs that can be used in engineering practice.

DOI: 10.5510/OGP20100300033

E-mail: fazilq.hasanov@socar.az


N.M.Safarov (“OilGasSientificRecearchProject” Institute)

About study an efficiency of plugging process of loss formation with viscous loose medium movement


In the paper with the aim of preventing plugging in the well drilling process, authors reviewed possibilities to apply viscous loose medium as plugging agent in routine maintenance. In order to study an efficiancy of plugging process of loss formation with viscous loose medium movement, was solved an asymmetric problem about its radial, unsteady move in the plain deformation conditions. With applying mathematical modeling method was determined condition minimising reverse outflow speed of pumped for plugging viscous loose medium out from the loss formation into the well. Via graphical way was identified that by increasing of depth penetration of viscous loose medium via loss formation, its friction angel ϕ of begins to increase .

DOI: 10.5510/OGP20100300034

E-mail: natik_safarov@mail.ru


S.F.Levin, T.V.Olneva (Paradigm)

Geological modelling of difficult constructed environments in software Paradigm ™ SKUA®


Nowadays geological modeling is in demand at various stages of exploration: reserves estimation, planning of subsequent geological and geophysical studies, new wells positioning, geosteering, and reservoir modeling. This can be explained by the fact that a geological model constitutes a synthesis of all geological and geophysical information received in the process of studying the simulated system. An important role in model building is played by the tools, which can not only help the specialist realize his ideas, but can also serve as a restricting factor. New technology of geological modeling has been implemented in Paradigm SKUA software. The technology is based on unique mathematical approach enabling models of any complexity level to be created.

DOI: 10.5510/OGP20100300035

E-mail: Tatyana.Olneva@PDGM.com


D.C.Tretheway, C.D.Meinhart (University of California)

A generating mechanism for apparent fluid slip in hydrophobic microchannels


Fluid slip has been observed experimentally in micro- and nanoscale flow devices by several investigators [e.g., Tretheway and Meinhart, Phys. Fluids 14, L9 (2002); Zhu and Granik, Phys. Rev.Lett. 87, 096105 (2001); Pit et al., Phys. Rev. Lett. 85, 980 (2000); and Choi et al., Phys. Fluids 15,2897(2003)]. This paper examines a possible mechanism for the measured fluid slip, for water flowing over a hydrophobic surface. We extend the work of Lum et al. [J. Phys. Chem. B 103, 4570 (1999)], Zhu and Granick [Phys. Rev. Lett. 87, 096105 (2001)], Granick et al. [Nature Materials 2,221 (2003)], and de Gennes [Langmuir 18, 3413 (2002)], who suggest slip develops from a depleted water region or vapor layer near a hydrophobic surface. By modeling the presence of either a depleted water layer or nanobubbles as an effective air gap at the wall, we calculate slip lengths for flow between two infinite parallel plates. The calculated slip lengths are consistent with experimental values when the gas layer is modeled as a continuum and significantly higher when rarefied gas conditions are assumed. The results suggest that the apparent fluid slip observed experimentally at hydrophobic surfaces may arise from either the presence of nanobubbles or a layer of low density fluid at the surface.

DOI: 10.5510/OGP20100300036

E-mail: meinhart@engineering.ucsb.edu


F.Bauget, R.Lenormand (Institut Français du Pétrole)

Mechanisms of bubble formation by pressure decline in porous media: a critical review


The modeling of primary production of heavy oils by solution gas drive is an active area of research. All the models, either written at Darcy scale or at pore scale (capillary network, population balance), account for the following mechanisms: bubble formation, bubble growth and gas flow. The first stage of bubble formation, also called bubble nucleation, is still controversial. In this paper, we discuss the existing nucleation models and demonstrate that the preexistence of bubbles is the only theory that is justified physically and can explain the ensemble of experimental observations. The preexisting bubbles are stabilized either by surfactants (models used for cavitation studies) or capillarity in crevices (models used in boiling). In both models, a given number of bubbles are activated at a given pressure drop. The only adjustable parameter is the distribution of diameters of the preexisting bubbles. This distribution is a property of the rock/fluid system that can be experimentally determined. The other models used in literature are based on the formation of a stable nucleus by thermal fluctuations. They lead to the notion of nucleation rate that is in contradiction with experimental results. We also discuss the terminology used in recent papers. Especially the terms of «instantaneous nucleation» and «progressive nucleation» are irrelevant if a mechanism of preexisting bubbles is assumed. They are also misleading since they lump the mechanism for bubble formation (statistics or preexistence) and the mechanism for pressure decline (either step or constant rate).

DOI: 10.5510/OGP20100300037

E-mail: roland.lenormand@cydarex.fr