To obtain better simulation model for fractured basement reservoirs, one of the important research trend is to improve of workflow and method for calibrating model parameters to dynamic data (history matching). Analyzing challenges and solutions in fractured reservoir simulation in general and basement fractured ones in particular, a workflow for calibrating model parameters to dynamic data has been proposed. At each step of the workflow, calibration routine is accomplished using Computer-Assisted History Matching techniques. To perform calibration workflow with five steps by using computer-assisted history matching techniques, three computer programs have been developed. This paper presents our study in developing methodology and accompanied computer tools

Keywords: history matching, fractured basement reservoir, pseudo relative permeability, parameterization, optimization.

As demostrated in development of oil and gas fields, in the process of exploitation pressure at bottom hole conditions may fall below bubble point pressure and gas dissolved in oil is liberated. Eventually the pressure Р_res = Р_bp is reached so in the zone where Р_res > Р_bp there is a single phase liquid and in zone Р_bp > Р_bhp - gas cut fluid could be produced. The bottom hole performance history shows an increase in free gas production, reducing oil mobility and oil production rates. The article details the variation of oil saturation and permeability to phases of gas cut fluid in cases, in cases where the initial fluid id undersaturated but the flowing bottom hole pressure is below bubble point. The formulas give the ability to approximate oil and gas phase-permeability curves linear dependences and to find a current oil saturation according to bore-hole surveying and formations. On the basis of the proposed method, phase-permeability curves of "Interruption" Suite from the "Guneshly" field and also dynamics of permeability to phases in reservoir development have been constructed. Practical deductions and
recommendations are drawn.

The "Interruption" Suite is the main reservoir unit in the "Guneshli" field. It is essential to stimulate the water injection process in order to enhance oil production, to ensure uniform movement of wateroil contact and to prevent reservoir pressure decline reducing production rates. Implementation of water injection involves enormous expenses therefore it is important to predict its outcomes. The development process of the "Interruption" Suite has been modelled using a modern software applications. As a consequence, new well locations have been proposed for stimulating water injection processes and an optimal volume of water to be injected has been estimated. The impact of water injection on development parameters has been predicted as a result of hydrodynamic calculations and the effectiveness of the process has been established.

The efficiency of physical-chemical impact methods applied for the purpose of increasing oil production depends on several factors: solution of reagent in the formation water without sediment, surface tension decrease in the oil fringe, increase of oil washing ability etc. Despite the existence of great number of SAS and chemical reagents, many of them form sediment in the formation and sea water. The energy resources saving, stable new composition solving without deposit was used for the work reported in this article and as a result of the experiments, a high recovery efficiency was demonstrated even for a redeveloped oil stratum having already been subjected to significant flooding.

In offshore oil fields of the Azerbaijan Republic, Caspian sea water is for water injection porposes. Chemical analysis of lower Pliocene "Interruption" Suite (IS) water and Caspian sea water at the major "Guneshli" field development showed that they differ significantly. In order to determine the nature of the processes that occur while flooding, chemical analysis of formation and sea water mixtures were compared with their theoretically rated values in the same ratios. Analyses confirmed that along with the increase of sea water percentage in mixture the content of ions Ca²⁺, Mg²⁺, SO₄^2-, CO₃^2- increases with simultaneous dilution of ions Na⁺ + K⁺, CI^-, HCO₃^-, RCOO^-, HB₄O₇^-. Such qualitative changes of chemical composition of mixtures are a reliable indication of the presence of Caspian sea water. Determination of Cl^- ion density in chemical composition of formation, injected water and in the mixture allowed:

- to determine non-compatibility of IS water mixture with Caspian water;
- to evaluate the amount of precipitated alkaline-earth carbonates;
- to evaluate the percentage of injected Caspian sea water in produced water from wells in the Pereriv Formation oil deposits of the "Guneshli" field.

Besides the application of magnetic systems, the practice of making use of magnetic rocks is known in oil production as well. The effect to increase a well flow rate by means of the proposed method is filling the cracks appearing during a hydraulic fracturing with high-conductive ferromagnetic gravel/propant. Formation water gets an initial gradient influenced by a magnetic field and remains motionless as a result of high pressure drop.

The developed technology of cleaning from oil sludges the devices OG-200 provides using the processing equipment operating at the enterprise. Efficiency of this method of the settlers cleaning, consists in the time significant reduction of cleaning, reduction of the settlers OG-200 idle time, reduction volume of the heavy operations, unhealthy the person, decrease in expenses for settler cleaning. Introduction of the cleaning offered technologies allows increases in quality of the prepared oil and to reduction in settlers OG-200 of corrosion aggression, thereby increases term of their operation.

For the purpose of efficiency increase of injected and selected gas from Galmas underground gas storage (UGS) there were researched: technological mode of working booster compressor station, installation of complex preparation of gas for transportation and other gas-field equipments. Thermodynamic and technological parameters of wells which participate in process injection and gas selection in UGS are investigated. Scientifically-research works were spent in Galmas UGS for development of new technology for the purpose of quality increase of prepared gas for transportation in Galmas UGS. On the basis of  results of scientific researches new complex absorbent for gas dewatering and for prevention hydrating was developed on the basis of domestic petrochemical products.

In the article the methodical approach to detailed production capacity analysis of wells in the defined Oil and Gas Production Board (OGPB) is suggested. The level of this index largely characterises productivity effectiveness. The investigation is conducted in five stages. Various variants of production capacity estimation are reviewed: by OGPD as a whole, by all wells, by well groups and by three smoothing variants. The factors influencing the production capacity are ranked and afterwards necessary estimations for above-mentioned variants of production capacity are carried out. In order to find the best variant in each stage of investigation, the correlation analysis for detection the dependence between factors and the production capacity has been conducted. According to the selected variant, charts, trends and the dimensions of approximation have been developed. In practice this method can be used in OGPB for the main production capacity analysis and in making management decisions in confirming resources in order to improve the productioneconomic activity of the enterprise.

In this article, the solvability conditions of a class of helder functions for linear parabolic systems of differential equations (by Petrovsky) with variable coefficients have been demonstrated. The correlations between the smoothing of known functions of the problem and the smoothing of the solution itself are exact. The constraints on coefficients that follow from solvability conditions are necessary for both boundary and initial conditions. We have applied these results to unsteady filtration problems for a homogeneous liquid in deformable fissure-porosity media.