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 SCOPUS, Russian Scientific Citation Index and abstracted in EI’s Compendex, Petroleum Abstracts (Tulsa), Inspec, Chemical Abstracts database.
Beginning with 2017 journal is indexed and abstracted in Emerging Sources Citation Index of Web of Science.
In recent years the main volume of explorative drilling and the seismic exploration, executed in the territory of Azerbaijan, was concentrated within the Yevlakh-Agdzhabedy depression. On this basis a comprehensive study of results of deep drilling and seismic exploration of the geological structure and oil and gas bearing of different tectonic zones in the areas both on its southwest boarder, and on the northeast has been performed. It has been determined that from the point of view of oil and gas the northeast boarder of the depression is considered more prospective, than its southwest boarder. On the northeast boarder oil and gas are present in the deeper horizons of the Upper Cretaceous as well as the Paleogene and Miocene formations. Oil accumulations are indicated within several structures (Muradkhanly, Zardob, Shykhbagi and Dzhafarli) of Zardob-Muradkhanly-Dzhafarli,a tectonic zone connected, generally with fractured effusive and carbonate rocks of the Upper Cretaceous. Also sedimentary rocks of middle Eocen and partially, terrigenny collectors of Maikop and Chockrac deposits. All oil pools are dated to lithology and structural traps. The foregoing indicates the existence of favorable geological conditions on the northeast boarder of this depression for reservoirs of meso-cenozoic deposits containing commercial fields of oil and gas.
The study analyzed the flow field of the Herschel-Bulkely fluid in drill string, intending to reveal the rotation effect of a drill string on the drilling fluid flow behavior and characteristics of friction pressure loss. The analysis was conducted using a Computational Fluid Dynamics (CFD) technique. Meanwhile, the influence of a helical flow field was explored, which is exerted by the rotation velocity of the drill string, axial velocity and fluid density variations. Also included is a comparative analysis between rotating and non-rotating flow of the Herschel-Bulkely fluid in drill string. When keeping other parameters constant, the friction pressure loss decreases with the growth of the rotation velocity, while the deviation percentage and deviation absolute value increase continuously. The result agrees with findings of relevant studies, with validity proved. On basis of the CFD results, a regressive model was established for analysis of friction pressure loss with rotation effect. Significant implications for drilling engineering are derived from the study. Deviation absolute value is able to guide drilling since the deviation absolute value can be too large to be neglected. Thus efficiency can be greatly increased in terms of drilling and equipment utilization, resulting in reduced cost.
Keywords: rotation effect, helical flow, friction pressure loss, drag reduction, Herschel-Bulkely model.
The influence of light metal nanoparticles on the strength of polymer gels used in the oil industry is presented in this work. As a result of studies we have found a 65% increase of the gel strength by the addition of nanoparticles. IWe presente a justification of the kinetic mechanism of nanofiller and its effect on gel formation. It is shown that the addition of the nanoparticles significantly alters the gelation process and the gel strength. The use of nanofillers significantly reduces the amount of polymer and total gel price.
Oil in the "Uzen" field is non-Newtonian with a high paraffin content, asphalt and tar and its positive temperature curing. A long period of cold waterinjection is the possible cause of loss of asphalt and tar and poor permeability of the productive reservoirs. Contamination layer zones (CVC), high skin factor lead to a decrease in the productivity of wells. In order to increase production, at the various treatment methods have been applied at the bottomhole zone of wells. The most effective of these with 75% success rate is a method of hydraulic fracturing of the formation. One of the important factors of success of ongoing fracturing of wells is the correct choice. We present in this paper an analysis that shows a method of selection of wells that is promising from the point of fracturing.
Accurate predictions of hydraulic parameters are essential for drilling operations. A comprehensive method of hydraulic parameter calculation is presented for a four-parameter rheological model. Based on the Rabinowitsch-Mooney equation, the explicit equation between the wall shear stress and volumetric flow rate of this model for pipe was obtained. When modeled as a slot, the equation for annular flow is also obtained. A new generalized flow index and effective diameter for annular flow were defined through theoretical analysis based on Metzner & Reed’s study. The new generalized effective diameter accounts for the effects both of annulus geometry and fluid rheology. Based on the definition of Fanning friction factor, the general expression of generalized Reynolds number for both annulus and pipe were derived in view of the fact that the generalized flow index is non-constant. We show the calculation method for generalized flow index and a utility pressure losses calculation model. The predictions of this method have been compared with an extensive set of data from literature. The comparisons of pressure loss show excellent agreement over laminar and turbulent flow regimes.
Keywords: comprehensive method, hydraulic calculation, four-parameter model, generalized effective diameter, solution for n’.
It is known that during of development of deep gas-condensate deposits, the decreasing of reservoir pressure leads to change of reservoir accumulation (porosity) properties. This paper proposed an algorithm for interpretation of well test data performed on steady-state flow mode to determine the original porosity value and calculation of reserves of gas condensate fields. The algorithm is based on hydrocarbon two-phase flow system model in deformable reservoir with phases composition change over time with pressure change. Real properties of phases are considered. The described algorithm is developed for two phase flow models with two hydrocarbon pseudo components and transition of hydrocarbon components between phases. Obtained solution has been tested by computer experiments and confirmed its satisfactory accuracy.
In the model of a five spot pattern stratum composed of two layers, the target oil remaining after water-oil displacement was displaced by foam plug obtained from industrial wastes at the rate of 25% of pore volume, followed with stratal water injection. So, when a high-permeable layer is over a low-permeable one, oil-recovery factor increases by 0.2, and by 0.16 unit fractions in the reverse arrangement. In summary, it is noted that during exploitation of fields with layered heterogeneous strata and more difficult to recover reserves, target oil can be recovered by foam banking at the rate of 25% of void content, followed with stratal water injection.
Estimation of the residual recoverable oil volumes through different horizons of "Muradkhanli" oilfield, which is at the latest development stage, was performed using different mathematical models: exponential, Gompertz, Kopitov and Kambarov. After analyzing current field exploration and estimation of residual recoverable oil volumes from the top chalk horizon it was identified that the main objectives are to correct an overestimation of oil reserves of the field and preparing a new depletion plan implementation.
The article briefly describes the current state of oil-field well-stream gathering system on "Uzen" and "Karamandybas" fields of JSC "Ozenmunaygaz". There presents the review of standard and updated group units, their differences, the equipment specifications.
The existence of essential hydrocarbon resource potential of a continental shelf of Russia at the same time that development opportunities are declining for land based fields creates a potential for development of offshore fields. In this regard particularly there is a question of determination of risk factors for projects on offshore hydrocarbon fields for the purpose of protection of investments during development and production of fields. In practice, the development of offshore fields in many areas of the continental shelf, the phenomenon of subsidence of the seabed is has been observed over gas fields (1 to 9.5 meters), which has led to a stability problems for offshore platforms. Hence, allowance for additional bottom subsidence under the effect of clay cap requires this value to be included into project process documentation and this will influence upon the whole project economics.
For protection of the oil gathering and transport system from electrochemical and microbiological corrosion under laboratory conditions, two variants of reagent "Oilgas -2008", notable for its high oil solubility and dispersing ability in water phase, have been prepared. The inhibitor properties of petroand water-soluble variants of the reagent, and also of their mixture, have been studied in sheeted water of the chink № 111 deposits of "Gunashli" by gravimetric and potentio-static methods. It is established that at high concentrations the water-soluble variants of the reagent interfere with salt precipitation. Petro- and water-soluble variants of a polyfunctional reagent "Oilgas-2008" with composition character possessing bactericide-inhibitor properties has been evaluated and recommended for field trials.
In the opinion of the authors, the detailed analysis of capital productivity from wells should be an important complement to the research of capital productivity by OGPB as a whole. At present this kind of analysis is not carried out in OGPB, and further, the methodical aspects of its practical usage are not developed. The summarized results on the research, carried out by the authors are presented in the article. The positive results on its approbation? in OGPB offshore and “Azneft” PU onshore permit conclusions about the possibility of the use of the suggested methodical approach in the normal practice of the enterprise, particularly when being used for while definition of the improvement of reserves.