Field development. Reservoir engineering. Production
ANALYSIS OF IMPLEMENTATION OF TECHNOLOGY SQUEEZING SCALE INHIBITOR INTO THE FORMATION FOR THE PREVENTION OF SCALE DEPOSITS IN THE BOTTOM ZONE OF PRODUCING WELLS FOR THE OIL FIELDS OF THE BASHKORTOSTAN
The analysis of data on introduction of technology of pumping inhibitor of salt sedimentations is carried out to layer for prevention of deposits of inorganic salts in a bottomhole zone of production wells for conditions of oil fields of the Republic of Bashkortostan.
This technology qualitatively differs from already used ways prevention of salt deposits in a well. Carrying out pumping inhibitor of salt sedimentations in layer is applicable practically for any wells and layers, providing protection of a well against the mouth up to the layer depth for the long period without periodic works.
Candidate wells for carrying out such processings were chosen on a condition of serious deposits of salts (frequent repairs of wells, fall of operational characteristics). In particular, repairs during which works on drilling of plaster deposits were carried out become economically and are technologically unjustified together with falling of oil production on an emergency well. These wells were also chosen in priority for carrying out the analyzed processing.
For the studied wells it is established that application of technology of pumping inhibitor of salt sedimentations in layer allows to protect qualitatively the equipment of a well, a bottomhole zone of layer from loss of inorganic salts that is confirmed by the analysis of trade data – stabilization of oil production and liquid, the termination of falling of coefficient of efficiency of a well. Long time of protection (more than 360 days) ensures both stable trouble-free operation of the processed wells, and economy of funds for periodic service of a well.
For reduction of influence of the found adverse factors of technology (increase in water content and duration of an exit of a well to regime parameters) careful selection of both wells, and reagent is necessary for carrying out processing.
STUDY OF ADSORPTION AND DESORPTION OF ASPHALTENE-PARAFFIN-RESIN INHIBITOR DEPOSITS IN THE PORE SPACE OF CARBONATE RESERVOIRS
The research of the formation of asphaltene-paraffin-resin deposition (APRD) in the micro pore volume of the reservoir for the study of oil found in microvolume long oil paraffin saturation temperature at 6-9 °C higher than in the void volume. Early transition paraffins in the solid phase leads to complications associated with the formation of APRD, reduces the effectiveness of the use of physical and chemical methods of preventing the formation of APRD dosing of the inhibitor on the bottom of the well. To prevent the formation of paraffin in the oil reservoir authors proposed the use of bottomhole formation zone as a natural inhibitor of the dispenser APRD in oil. Studies on adsorption of the inhibitor on the walls of the breed in its injection into the formation, and subsequent desorption elution inhibitor of the formation of crude oil. Analysis of experimental results has allowed to establish an effective concentration of the inhibitor in paraffin oil during its injection into the bottomhole formation zone, the adsorption of the inhibitor on the walls of rock, as well as the duration of the desorption of the inhibitor from the formation. It was found that the injection of paraffin inhibitor solution in the bottomhole formation zone will reduce the saturation temperature of the paraffin oil in the pore space of the collector.
Gas’ temperature and pressure decrease during the transportation from the well to the complex gas treatment plant. As a result hydrate plugs form and it causes alarm situations. Conditions of gas hydrate formation are analyzed in the article. The most probable places of gas hydrate formation are detected.
The main way of gas hydration control is the creating condition of thermodynamical instability of hydrates. The thermal, technological and chemical methods are used for gas hydration control. In the case of gas hydration occurs, it is liquidated by pressure leakage, methanol injection, local heating or by combination of mentioned methods. Using the concrete method depends on plug size, its location, outside temperature and others.
To prevent formation of hydrates it’s offered to increase the number of controlled parameters which influence hydrating. By the way temperature, pressure, oil-water content and methanol concentration in spent solution could be additionally measured.
It’s necessary to raise the level of making decisions when emergency situations occur. For that reason authors have offered to use expert system of operative management. This system should generate control instruction using cooperative processing. Database is formed by real-time data and by knowledge system formed by experts. There is database structure shown in the article.
GEOLOGICAL-TECHNICAL MEASURES FOR CONTROL AND REGULATION OF DEVELOPMENT OF DEPOSITS OF KOGALYM GROUP IN CONCLUDING STAGE
The article discusses the most effective interventions stimulation in a wedge-like structure of deposits for large deposit Kogalym group.
Showing: realization of the cards remaining recoverable oil reserves with the help of three-dimensional geological and hydrodynamic modeling; selection of promising areas with the highest concentration of the density of residual stocks and taking into account the peculiarities of sedimentation.
Based on statistical modeling of the effectiveness of a number of completed projects of hydraulic fracturing (frac), highlighted the most influential factors and favorable zones identified the success of the recommended measures. Selection of sites was performed by grouping wells using a fracturing and the degree of efficiency. The dependences obtained are consistent with the characteristics of sedimentation and ranking analyzed geological and reservoir on the fishing grounds. The criteria applying hydraulic fracturing with our additions.
The effective application of hydrodynamic EOR methods implemented a complex interaction of injection wells to production, is based on obtaining maps line filtering and Spearman rank coefficient. As a result of these implementations, and selected portions of the well-candidates for new types of hydrodynamic EOR.
On the basis of the establishment of the correlation relationship between the production and injection wells were selected group of wells to be able to use technologies of non-stationary flooding and changing the direction of filtration flows. Selection of the duration of the cycles carried out by the formula VI Shchelkachev based on the calculation piezoconductivity formation. For wells with a cycle of more than 80 days is considered an option activities change direction of filtration flows. For all variants forecast oil production is estimated by calculating the hydrodynamic simulation.
Studies conducted in the framework of the State Scientific and Technical Program «Bashkortostan 2020 – The rational use of natural resources and the modernization of oil and gas technologies» and with the support of the CCI «Kogalymneftegas».