Bottomhole Zone Of Wells Research Articles

Моделирование PVT свойств в пределах блока Тайсоган на примере месторождений Уаз, Уаз Восточый, Уаз Северный

The availability of reliable data on the PVT properties of reservoir fluids plays a leading role in calculating the reserves of oil and gas reservoirs, estimating the oil recovery factor, well testing, numerical reservoir modeling and for making informed decisions in field development design. In practice, the results of field, laboratory and theoretical studies are used simultaneously to substantiate the properties of natural hydrocarbon mixtures. At each of the noted stages, specialists strive to increase the reliability of the data obtained and develop methods for their interpretation. Determining the properties of reservoir fluids of an oil field is a prerequisite for the effective use of various methods of influencing the bottomhole zone of wells, selection of equipment for well operation. The properties of reservoir fluids are determined by various thermobaric conditions and change depending on the current state of the reservoir and the characteristics of reservoir pressure changes. All known methods for determining the properties of formation fluids are divided into two groups: experimental and computational. Each of the groups has both advantages and certain disadvantages.

METHODOLOGY FOR QUALITY CONTROL AND APPLICATION OF OILFIELD CHEMICALS

The problems and methodology of the procedure for operational field control of the application technology and oilfield chemicals are SHAPE \\* MERGEFORMAT described in the article. The methodology includes the technology of operational instrumental identification of the brand and verification of the reagent quality. The methodology is applicable at all stages of the life cycle of reagents: «laboratory research» - «field tests» - «field application» in the chemicalization of production. The methodological foundations of a new approach to operational (field) monitoring of the quality of services and oilfield reagents have been developed: control stages, a list of controlled documents, the volume and algorithm for checking permits, technology and quantitative criteria for assessing quality of oilfield reagents. Unified reporting forms have been developed, including a contractor information sheet and a feedback sheet. The unification of reporting forms is aimed at the subsequent statistical processing of an array of field reports using specified algorithms with the output of a summary on the operational quality control of reagents for any period. Current results of the project: new methodology and draft corporate standard for quality management of services and operational quality control of reagents, technology for operational instrumental identification of the brand and verification of the quality of the reagent. The prospects for the development of the technology of operational quality control have been determined, including the expansion of the field of applicability of the technology to reagents used in chemical treatment of bottomhole zones of wells, hydraulic fracturing, methods of increasing oil recovery, as well as the involvement of equipment and instrumentation measuring the composition of reagents for the incoming control procedure. Pilot field application of the project results is planned at Bashneft PJSOC. Further, the technology will be adapted for implementation in the Production Companies of Rosneft PJSC.

The choice of technologies for restoring the properties of the bottomhole zone of wells in deposits with low-viscosity oils

Based on the analysis of many years of experience in the operation of the Tuymazinskaya group of oil fields, it has been established that one of the most effective methods for restoring the injectivity of injection wells is chemical treatment of the bottomhole zone of wells with various acid compositions in conjunction with well reperforation and the use of coiled tubing technologies.

Modeling of clay acid effects on the bottomhole zone of wells

Typical wells have been identified in the conditions of the Langepass group deposits, according to which modeling of the clay-acid process on the bottom-hole formation zone has been performed. There was a significant increase in the efficiency of operations based on the use of developed models, which allows choosing the most optimal technologies and exposure parameters depending on the properties of the productive formations.

The influence of contamination of the bottom-hole formation zone and the of perforation channels parameters on the productivity of gas wells

The reasons and nature of contamination of the bottomhole zone of wells are characterized. The structure of the skin effect is revealed. The characteristics of the types of well completion and the main parameters that are necessary to determine the skin effect are given. For the conditions of a hypothetical well, using the PipeSim program from Schlumberger, the influence of the permeability and thickness of the contaminated bottomhole formation zone on the value of the skin effect is investigated. The graphical dependences of the skin effect of the contaminated zone on its thickness and permeability are shown. The results of graphical dependencies are processed using statistical analysis. According to the research results, the value of the skin effect increases with the decrease in the permeability of the contaminated zone relative to the permeability of the productive formation and with the increase in the radius of the contaminated zone. The improvement in the filtration properties of the bottomhole formation zone occurs with the increase in the permeability of the contaminated zone compared to the formation permeability. The optimal values ​​of the permeability and thickness of the contaminated zone are obtained, above which the skin effect practically does not change. The study of the influence of the quantity and size (length and diameter) of perforation channels per one meter of the open layer thickness is carried out. The research results are shown on the graphical dependences of gas flow rate and bottomhole pressure on the number of perforations per one meter of the open formation thickness, their length and diameter. The use of perforation channels that pass through the conta-minated zone has been substantiated to improve the hydrodynamic connection of the formation with the well and increase the gas production rate. According to the results of studies carried out using the McLeod model, the optimal diameter of the perforation channels is 0,029 m, the length of the channels is 0,296 m, and the number of channels per meter of the open formation thickness is 16.

On the use of geophysical research data aiming to increase the efficiency impact on the bottomhole zone of wells

Under the conditions of terrigenous Jurassic deposits in Western Siberia, we conducted a study on the influence of depositsʼ geological structure features, reflected by the results of geophysical surveys of wells on the effectiveness of the impact on the bottomhole zone using the hydrochloric acid composition Aldinol-20. It was established that in predicting the effectiveness of the impact on the bottomhole well zone, it is necessary to use the data of geophysical studies. At the stage of putting the field into development, it is enough to limit this information in the absence of it. The article proposes a technique that allows us to solve the tasks at different stages of development. The technique is based on the use of geological and statistical models and it is built based on using various performance criteria for various amounts of information. It is to be conducted in the conditions of a limited amount of information about deposits due to insufficient volumes of field research of organizational and financial nature, as well as in case of changing the tactics and strategies of enterprises in market conditions.

Physical and mathematical modeling of cyclic steam stimulation for oil reservoirs

This article discusses the construction of a physical and mathematical model of the steam cycle effect on oil reservoirs. Existing models require calculations in hydrodynamic simulators or significantly simplify the description of the motion of the heat front. Within the framework of the proposed model, a number of assumptions are introduced regarding the movement of the thermal interface between the heated oil located in the bottomhole zone and the oil whose temperature is equal to the initial one. It is assumed that this boundary has the form of a straight line in a rectangular coordinate system. Moreover, at the initial moment of time, the straight line is determined by two points: the value of the maximum power taken on the vertical axis, directed downward, and the maximum radius of heating on the horizontal axis. In the future, these parameters are reduced. It is assumed that over time, the interface between the “cold” and heated oil shifts parallel to its initial position with a decrease in the parameters that determine it. This approach to describing the displacement over time of this boundary is proposed for the first time. The purpose of the article is to determine the flow rate of the well in the case of steam-thermal treatment of the formation, taking into account the size of the heated zone. In particular, the coolant injection cycle time and the characteristic time of the steam and thermal impregnation for the proposed model are determined. The physical processes considered during the construction of this model are described by conservation laws. The calculation of the area in which the heated oil will be located takes into account parameters such as flow rate and heat content of the coolant, reservoir thickness and thermal properties of the surrounding rocks. The article discusses the issues related to the relevance of the application of the methodology of vapor-cyclical effects on oil reservoirs. The result of the developed model is the dependence of the oil production rate on time for the cyclic treatment of bottom-hole zones of wells. The proposed method allows us to analyze the development efficiency depending on the main technological parameters. Such calculations allow you to choose the most optimal development strategy, and therefore, increase oil recovery.

Технологии интенсификации добычи нефти путем глубокой очистки призабойной зоны скважин реагентами РБС-3 и ДГК-2

Технологии интенсификации добычи нефти путем глубокой очистки призабойной зоны скважин реагентами РБС-3 и ДГК-2

Очистка призабойной зоны скважины

Очистка призабойной зоны скважины