Treatment Of Bottomhole Formation Zone Research Articles

Machine learning methods for selecting candidate wells for bottomhole formation zone treatment

Machine learning methods for selecting candidate wells for bottomhole formation zone treatment

The research of the gas wells bottomhole formation zone treatment efficiency

The final stage of development of natural gas fields is characterized by depletion of reservoir energy, deterioration of the bottomhole formation zone, which leads to low gas and condensate flow rates. Development of new and improvement of existing technologies for stimulation of oil and gas production for the conditions of Ukrainian fields should be carried out taking into account the fact that most fields are in the final stage of development; production wells are mainly marginal, water-flooded and are characterized by a significant decrease in the natural filtration properties of the bottomhole formation zone due to its colmatage with filtrates and dispersed particles used in drilling, well operation or workover, deposits of resins, asphaltens, paraffins, forming of high viscosity emulsions, swelling of the clay particles of the formation present in the reservoir, and the presence of other clogging agents. The well, its bottomhole zone and the formation part between the wells are interconnected and interacting elements of a single system. Failure to take into account the features and degree of impact of the bottomhole formation zone as one of the system’s elements leads to a general decrease in the development efficacy of the field as a whole. Therefore, the choice of technologies for the impact on the bottomhole formation zone requires a very careful assessment, taking into account the technological efficiency and payout time. The aim of the research is to determine the influence of the bottomhole formation treatment parameters on the well productivity. The tasks have been performed by analyzing the literature and conducting analytical calculations of the impact of various parameters of the treatment zone on the flow rate of the well. The described methods and results of calculations can be implemented in production when planning the action on the bottomhole formation zone by selecting the optimal treatment parameters at different stages of field development.

Forecasting the Effectiveness of Well Performance Improvement Techniques

The article discusses the Pearson criterion method to determine the effectiveness of the chemical methods of the bottomhole formation zone treatment, the well zone and further improvement of the corresponding methods. Despite the rather high efficiency of the physicochemical methods used to increase oil recovery in the Shirotniy Ob area, ongoing geological and technical measures do not always ensure the optimal volumes of additional oil production achievement. Because of the bottom-hole formation zone treatments, an increase in the wells production rate was obtained. However, there are wells in which, after applying the enhanced oil recovery (EOR) techniques, the well production rates not only did not increase, but, moreover, their decrease and increase in water cut were noted. The increase in well flow rates after treatments varies widely; the effect duration is also different. The study of the effectiveness of the bottomhole formation treatment jobs organization modeling calls for a fundamentally new formulation and new methodological solutions. It should be carried out taking into account the economic feasibility of various forms and methods of work organizing, providing for maintenance based on analysis and geological field material processing by means of mathematical methods and computer technology. In this regard, the a systematic approach methodology application for analyzing and regulating the effectiveness of physicochemical methods of oil recovery enhancing at a late stage of oil field development is an urgent task and involves the creation of models that can significantly increase the of reliability of the justification and work organization for the use of progressive wells formation treatment techniques.

The Thermal Treatment of Bottom-Hole Formation Zone of Gas Condensate Well

In the process of gas condensate field development and operation there is a decrease in the production well bottom-hole flow pressure. When the bottom-hole pressure drops below the dew point pressure condensate accumulates in the bottom-hole zone of the well, which leads to a formation of the condensate front. As a result, the productivity of the well is reduced both by gas and condensate.With an increase in temperature the liquid condensate becomes versatile and enters the gas phase; so the accumulation of retrograde condensate can be reduced by increasing the temperature in the bottom-hole zone. Vaporization of condensate and its transfer into the gas phase can be carried out by electrothermic treatment of the bottom-hole zone. In this case it is necessary to use special equipment – a bottom hole electrical heater.

Analysis of the technology of intensifying oil production through the bottomhole formation zone treatment in the Potochnoe field

The article aims at reviewing the effectiveness of the technology application to intensify production through the bottomhole formation zone treatment in the Potochnoe field. These technologies are becoming necessary measures if there is a possibility of dissolving rock or items that are deferred and reduce permeability. When carrying out any treatment of a bottomhole formation zone, we require a scientific approach to the selection of reagents that takes into account all terms of the collector and the containing fluid. The results presented in this paper are used when planning and implementing the intensification technologies of oil production through the bottomhole formation zone treatment in the field. There are also analyzed the laboratory tests typical for the conditions being similar to the Potochnoe field. There were considered the core samples from Urevskoye (facility UV1, AB13 and Ach2) and Severo-Potochnoe (facility BB6) fields, and, accordingly, the impact of reagents on them. It was revealed that the reagent Altinex/1.2 has a low corrosion activity in the formation conditions, meets the requirements for the share and stabilization of iron, for compatibility with water, and is fully appropriate under the operating conditions of the Potochnoe field. The article discusses the effectiveness of technologies and makeups separately at the facilities for which the recommended makeups were composed taking into account the compatibility of the reagents with formation water, the rate of core solubility and compatibility with oil.

Bottomhole formation zone treatment process modelling with the use geological and geophysical information

The study of West-Siberian Siberian Oil and Gas Province terrigenous reservoirs geological structure peculiarities influence timed to the Jurassic age deposits on defined according to the wells’ geological and geophysical data on the bottomhole formation zone treatment success with acid compositions on the basis of compositions Aldinol-20 application. On the basis of the generalizations conducted it was established, that in bottomhole formation zone treatment efficiency predicting it is necessary to rely on the geophysical research data, and at the oil-field commencement stage in case of lack of information it is enough to use only this information. The method based on geological and statistical models application, constructed on the basis of various efficiency criteria at various information volumes using, allowing the set tasks solving at various development stages and in the context of limited information about deposits due to insufficient volume of field research owing to the reasons of organizational and financial character, and also at the enterprises tactics and strategy in the market economy conditions change is offered.

Studies on Applying Acid Compositions to Treat the Western Siberian Field Bottomhole Formation Zone

Effective development of oil deposits includes the measures to restore and improve the porosity and permeability properties (PPP) of reservoir units, which inevitably deteriorate during the operation of the field. For this purpose, various technologies of bottomhole formation zone acid treatment (BFZAT) are used. These approaches are sufficiently developed and usually do not require additional laboratory adaptation. Specific requirements for technologies that include acid effect on the formation are required for interventions on low-permeability reservoirs (LPR), where the influence of the mineralogical composition of rocks and their porosity and permeability properties on the efficiency of BFZAT is the most significant. Therefore, during interventions development for LPR using acid methods, it is necessary to correctly assess the capabilities of a particular method (composition) in relation to specific conditions. This can be achieved by conducting standard laboratory tests (determination of rock carbonation and mass loss in 12% hydrochloric acid) and additional experiments to determine the mass of the secondary sediment, as well as the optimum reaction time at the formation temperature. The research objective is a laboratory research on the selection of acid compositions for bottomhole formation zone treatment for a number of low-permeability reservoirs in Western Siberia. Standard and special laboratory studies have allowed suggesting the most optimum acid compositions adapted to “rigid” formation conditions.

Оценка теплового эффекта обработки призабойной зоны пласта энерговыделяющими бинарными смесями

Оценка теплового эффекта обработки призабойной зоны пласта энерговыделяющими бинарными смесями

Информационный способ повышения эффективности методов воздействия на призабойную зону пласта в действующих скважинах

Информационный способ повышения эффективности методов воздействия на призабойную зону пласта в действующих скважинах