Tag Archives: скважина
Prospects of development of hydrocarbon resources of Russia’s continental shelf and their transportation to the end consumers determine the necessity of the establishment of marine energy industry, which includes offshore platforms for oil and gas. Construction and operation of offshore platforms is associated with a high risk both human and economic. According to the WOAD (World Offshore Accident Dataset) in 2013 was identified 265 incidents/accidents occurred on offshore platforms, or 4.11 % of the accidents recorded accidents on offshore structures in the world. Since the average cost of the platforms in the sea of 3-5 times more than on land, depending on the construction conditions, the occurrence of threat or emergency, could lead to such a significant increase in the cost of the project, which can be disastrous for the overall project.
To assess the scope of loss of life from hazards fire and explosion hazard situations on offshore drilling platforms, you must use the Order №404 from 10.07.2009 “On approval of the method of determining the fire risk at industrial facilities”. However, the applicability of this document to assess fire risk offshore drilling platform is complicated by the fact that there are no reference data on the frequencies of occurrence of fire and explosion hazardous situations at the drilling offshore platforms, which makes it impossible for a fire risk assessment in General for this kind of objects.
This work is devoted to determination of frequencies of occurrence of fire and explosion hazard situations on offshore drilling platforms. To achieve this purpose were used: method of expert evaluations of probabilities of events, the method of risk analysis, quantitative methods, based on available materials (including databases, DNV Technica) on equipment failures and accidents in the operation of offshore platforms in the North sea and the Gulf of Mexico.
At present time the interest to the quantitative interpretation of temperature surveys is growing. Individual flow rate and reservoir pressure of each layer, behind-casing flow rate, hydrodynamic layer parameters, characterization of permeability changing at near-wellbore zone become the purposes of quantitative interpretation. Non-stationary temperature and pressure in the well are used as input data for transient processes analysis, and temperature logs are used for quasi-stationary analysis. Particular interest is in determination of the individual layer flow rates and near-wellbore zone parameters.
The paper studies the problem of unsteady temperature field in heterogeneous reservoir during fluid filtration. The aim of this work was to develop and provide rationale for simplified analytical model of non-isothermal single-phase fluid filtration in heterogeneous reservoir. Analytical solution for the temperature field in the formation after flow rate changeis obtained by the method of characteristics. Two assumptions were made in solving the problem: radial thermal conduction and compressibility of saturated porous medium are ignored. Analytical models are compared with the numerical solution of the problem. Radial heat conduction and compressibility of oil- or water-saturated reservoirs influence insignificantly on the unsteady temperature field after the flow rate changes.
It is possible to solve the inverse problem on the evaluation of the damage zone radius of the permeability in the reservoir basing on the model curves of the temperature change after flow rate change. The possibility of that method realization is demonstrated on model curves of the temperature change.
APPLICATION OF SENSORS-SIGNALER SAND AND DRIP MOISTURE TO THE MONITORING MODE OF THE WELLS UNDERGROUND GAS STORAGE
The article shows the relevance of monitoring the removal of particulate matter and condensed moisture in the product UGS wells, gas and gas condensate fields. Comparative characteristics of used domestic and foreign acoustic control in the gas flow phases is given. Particular attention is paid to the simultaneous control of the content of sand and condensed moisture alarms sensors that do not require expensive verification schemes and allow reliable assessment of the dynamics of the processes at the wellhead and gas gathering points. The results of operation of the combined alarm sensor DSS-AKE-2 on the two largest domestic UGS. The necessity of a direct calibration of acoustic sensors on the technological objects of different configurations is set. It is shown that the currently used in advanced devices such as DSS-A modification and the production of “Sigma-Optic” in performance is not inferior to foreign analogues in the implementation of operational monitoring wells operating parameters. The devices allow a timely manner to prevent flooding, the formation of clay-sand plugs, as well as reduce the risks of abrasive destruction of gas production equipment. The analysis of existing designs of detectors and alarms sensors showed that the sensor performance DSP-AKE-2 is not inferior to any domestic or foreign analogues, and for the simultaneous control of sand and condensed moisture superior to them and may be subject to import substitution. They can be used to predict the destruction of the reservoir, the formation of clay-sand plugs, reduce erosion-corrosion wear of gas production equipment and to minimize the costs of cleaning and preparation to transport gas.
Study of state and reservoir properties is possible with the laboratory, geophysical and hydrodynamic methods. Laboratory methods are based on the study of the core. Currently, there is quite wide range of laboratory equipment to study the parameters of rocks. Geophysical studies allow us to determine the average properties of the producing formation are only a short distance from the borehole wall. Hydrodynamic research methods, in turn, allow us to determine the mean values at a considerable distance from the well, which contributes to the definition of more information on the work of formation.
Well test are very important because they are the only more or less reliable source of information about the permeability and porosity of the reservoir and the section as a whole.
Feeling of relative well-being and some of completion reached in the direction of hydrodynamic studies of oil and gas science is somewhat misleading. Often the problem of determining the filtration characteristics of the reservoir are unstable with respect to inaccurate input data.
Today, there are quite a number of commercial software products, allows us to interpret the results of field research. But often these packages are still far from perfect.
Development of oil and gas deposits with carbonate reservoirs characterized by a number of specific features associated with the passage of fluid into the medium with double porosity. Development of methods of mathematical modeling fluid flow in this environment is an important task.
Today there is no question of the leading roles in the filtration properties of fractured tight reservoir rocks. This is natural, because the fracture of rocks dramatically increases their permeability. Thus, the technology development of deposits with the data collectors can be effectively carried out only on the basis of a comprehensive study of filtering mechanisms in heterogeneous fractured porous reservoirs.
EXPERIENCE IN THE USE OF DOWNHOLE DEMULSIFICATION TO IMPROVE OPERATIONAL EFFICIENCY OF THE ESP ARLAN FIELD
Currently, oil and gas companies have policies significant savings in costs and resources. In Bashneft implemented a range of programs on energy saving and increasing energy efficiency of production. The program of energy saving and energy-saving technologies to be significantly associated with the reduction of energy losses and reduce the turnaround time of operation of the equipment. The implementation of these programs is only possible through constant research processes occur when the energy-consuming equipment and timely decision making.
The problem of increasing the efficiency of downhole equipment associated with an increase in the profitability of oil production through the use of advanced technologies and increase the turnaround time. This article discusses a method of downhole demulsification used to increase the efficiency of operation of the wells equipped with ESP. The method used in the conditions of education in lifting equipment high-viscosity stable oil-water emulsions. Their formation leads to frequent failure of pumping equipment, the increase in the number of repairs and, consequently, higher costs of oil production. As studies have shown, the impact on production wells at the time of formation of emulsion systems can significantly reduce frictional properties of the moving mixture. The article presents the results of field tests of the technology of injection of the demulsifier with SPCU and withdrawal wells in the mode with frequency control of the drive. The application of these technologies has allowed to reduce costs on the rise of production wells to increase oil production.