As a result of study of the reservoir properties of PostKirmaki Sand (NKP) Suite in the Absheron oil-gas bearing region a number of regularities has been recorded.Sediments of NKP of Absheron oil-gas bearing region generally presented by sandy silty material. Relatively big amount of silt fraction is recorded on Qaradag, Lokbatan, Shubani, Balakhny-Sabuchi-Ramana, Zix, Mashtaga, Buzovna, Qum Adasi fields. On the other fields (Qushkhana, Bibiheybet, Surakhany, Qarachukhur, Merdeken-deniz) decreasing of sand fraction is observed. Sediments of NKP Suite are characterized by the good reservoir properties in general: porosity, on average, is 15-20%, permeability – 100-300×10^-15 m². A clear trend of these sediments porosity change with the depth is observed. The lowest porosity has been recorded in the interval 2000-3000 m, below (down to 4000 m) which some growth of this parameter’s value has been determined. The presence of clay fraction has a negative effect on the filtration properties of NKP Suite sediments. This effect increases when the sand fraction predominates in the sediments. The presence of carbonates also has a negative effect on the permeability of the sediments when their contents are over 20%. Thus, we can affirm that besides mud cement the carbonate cement also has wide occurrence in NKP Suite rocks. Positive correlation between carbonates and pelitic fraction contents testity to primary sedimentary origin of carbonates in NKP suite sediments.

Pyrolysis data generated on the Oligocene-Miocene sediments in Shamakhy-Gobustan area, Azerbaijan, allowed determining the threshold concentrations of organic material above which effective expulsion of hydrocarbons from source intervals may take place. According to the alternative estimates of Hydrogen Index for the Oligocene-Miocenerock samples in the South Caspian basin there may be layers with higher generative potential than the averaged values of the given index previously indicated.

Process of bottom-hole pressure build-up in flat-radial oil reservoir is investigated in the article. Analytical solution of bottom-hole pressure build-up during oil displacement by water in flat-radial reservoir with allowance for non-instantaneous inflow stopping problem is obtained. It is shown that moving water-oil contact into producing well has considerable influence upon character of pressure build-up curves. Numerical evaluation showed good conformability with experimental and field results according to obtained in the article equations. Equation for preliminary estimation of time of water into producing well is obtained.

For the first time, based on their permeability differential, four heterogeneity levels have been pinpointed and quantitatively substantiated with regard to Semiluki strata of Ostashkovichi oilfield. It has been found out that the permeability coefficient of dense unsorted carbonates typically reaches up to 0,1-2,0 mD, up to 980-3200 mD in linear-local fractured zones, up to 3200-5000 mD in linear-regional fractured zones, and up to 220 mD in the fractured liminal environment of individual well drainage zones.

The applications of horizontal well technology in developing hydrocarbon reservoirs have been widely used in recent years. One of the main objectives of using this technology is to improve hydrocarbon recovery from water and/or gas-cap drive reservoirs. The advantages of using a horizontal well over a conventional vertical well are their larger capacity to produce oil at the same drawdown and alonger breakthrough time at a given production rate.  Coning is a term used to describe the mechanism underlying the upward movement of water and or the down movement of gas into the perforations of a producing well. Coning can seriously impact the well productivity and influence the degree of depletion and the overall recovery efficiency of the oil reservoirs.  Delaying the encroachment and production of gas and water are essentially the controlling factor in maximizing the field’s ultimate oil recovery. Since coning can have an important influence on operations, recovery, and economics, it is the objective of this paper to develop a computer program for calculating the critical oil (or gas) rate to avoid coning of unwanted fluids into production wells and to predict the behavior of water and gas coning in horizontal wells

The topic of this article is fractal analysis methods of time series fluctuations. The fluctuations are conditionally subdivided into two categories: straightening and non-straightening on fractal plane. A method of fractal dimension calculation of time series has been offered. The sensitivity of the method to the volume of data has been assessed. Criterion for estimation of processes conditions with close fractal dimensions has been offered. Non-parametric criterion has been worked out for fluctuations which do not straighten on fractal plane. The criterion is capable of picking out the changes in dynamic system behavior. The application of the suggested criteria has been tested on model and practical examples. A retrospective analysis of a well performance has been carried out as an example of practical application. The calculation algorithm of the suggested criteria is easily realized which is significant in the practice of engineering calculations.

Decisions of wide class concrete practical problems on tanks strength calculation are obtained in the article. Influence of different factors upon tank stressed and distorted state is revealed. General method of thin wall construction linearization with variable parameters, possessing accelerated convergence, is suggested.

PRIME is a tool using the Windows environment created for collection, visual representation, processing and storage of geological and geophysical data in the oil industry. Long-term history of improvement the system undergone taking into account users’ requirements resulted in creation powerful, flexible and, at the same time, easy-to-use tool for geophysicists, petrophysicists and geologists. Collection, analysis and processing of well logging data at all stages of a well life (open hole, cementing or a cased borehole) is what PRIME good at. The local data base supports one- and multiple-hole manipulations. Number of fields, wells, volume and content of well data is practically unlimited. It may support various data models. Modular structure makes creation of a workplace easy no matter how complicated it is and which purpose it is created for to meet in the best way any user requirements. It supports both continuous and formation by formation types of data as well as techniques of their processing including mixed types of data. A special feature of the tool is handling core data. PRIME facilitates creation and handling of a ready made data processing flow by a user himself. The open code makes PRIME environment universal to facilitate development of new applications. The system open for extension and development within DLL, COM and internal language standard allows users to develop the system’s abilities on their own meeting certain conditions.

The paper describes set of geomodeling and flow simulation technologies for planning, optimization and steering of horizontal wells and sidetracks. Following technologies are discussed:
1. Integrated well planning on the basis of 3D geological and flow simulation models.
2. Uncertainty evaluation using 3D models
3. Accounting for wellbore flow effects in 3D flow simulation
4. Drilling monitoring
5. Updating structural model while drilling horizontal well
6. Local update of 3D models

Transient multiphase modeling system OLGA is used by oil&gas companies worldwide to provide flow assurance and production shut-in time reduction. Traditionally flow dynamic modeling is used to optimize pipeline hydraulic diameter and equipment allocation, simulate liquid loading for various operation scenarios, wax and hydrates

A novel dimensionless parameter, the particle moment number Pa, was derived using dimensional analysis of the particle-laden Navier-Stokes equations, in order to understand the underlying physics of turbulence modification by particles. A set of 80 previous experimental measurements where the turbulent kinetic energy was modified by particles was examined, and all results could clearly be divided into three groups in Re-Pa mappings. The turbulence attenuation region was observed between the augmentation regions with two critical particle momentum numbers.

Electrokinetic effects and electrostatic repulsion between tracer particles and glass surface have both been proposed as possible sources that would lead to false slip results obtained from velocimetry-based measurements. Using a three-dimensional total internal reflection velocimetry technique, we address such a concern by comparing the measured slip lengths between nonionic solutions and electrolyte solutions whose ionic concentrations have been predicted to reduce the electricity-induced slip effect to a submolecular level. It is observed that the presence of electrolytes has no effect on the measured slip lengths, suggesting that the observed slip velocities are most likely not due to electrostatic and electrokinetic effects, but are consequences of true boundary slip.