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Моделирование напряженно-деформированного состояния необсаженной скважины

Моделирование напряженно-деформированного состояния необсаженной скважины

Abstract

Решена задача исследования напряженно-деформированного состояния скважины. Для расчета НДС использована программа трехмерного конечно-разностного инженерного анализа FLAC 3D. Рассмотрен равномерно насыщенный в начальный момент времени сектор пласта, в центре которого расположена скважина. Решение производится в два шага. Первый шаг представляет собой нагружение геостатической нагрузкой. В качестве второго шага рассмотрено изменение пластового давления за счет задания дебита на радиусе скважины. Задача решена как полностью связанная, это выражается в одновременном учете соотношений механики и гидродинамики. В процессе решения с течением времени при изменении пластового давления происходит изменение эффективных напряжений. В качестве физических соотношений взят закон Гука, т.е. при решении рассмотрена упругая модель поведения материала. Фильтрация флюида происходит в соответствии с законом Дарси. В работе представлена математическая постановка задачи, содержащая соотношения теории упругости, закон фильтрации и краевые условия. Для обработки результатов написана программа на языке FISH внутреннем языке программы FLAC 3D. Получена зависимость безразмерного пластового давления от безразмерного радиуса, а также зависимость безразмерных напряжений от безразмерного радиуса для определенного момента времени.

A problem of the stress-deformed state (SDS) of the well is solved. To calculate SDS a 3D application of finite-difference engineering analysis FLAC 3D is used. A part of reservoir evenly saturated at the initial stage is considered, at the center of which a well is located. The solution has two steps. Step one relates to geostatic load; step two concerns reservoir pressure change due to flow rate specification on the well radius. The problem is approached as connected, which means simultaneous addressing correlations of mechanics and hydrodynamics. Reservoir pressure changes over time and so does actual stress. The Hooke’s law is chosen as the foundation for physical relations, i.e. elastic model of material behaviour is used. Fluid filtration follows the Darcy’s law. The paper suggests a mathematic setting of the problem embracing correlations of the elasticity theory, filtration law and boundary conditions. To process the results an application was written in FISH, the internal language of FLAC 3D. Dependences are obtained of dimensionless reservoir pressure on dimensionless radius, as well as dimensionless stresses on dimensionless radius for a given period of time.

Keywords

ДОБЫВАЮЩАЯ СКВАЖИНА,EXPLOITATION WELL,МОДЕЛИРОВАНИЕ НДС,FLAC 3D,СВЯЗАННАЯ ЗАДАЧА,ПЛАСТОВОЕ ДАВЛЕНИЕ,RESERVOIR PRESSURE,МЕТОД КОНЕЧНЫХ РАЗНОСТЕЙ,FINITE-DIFFERENCE METHOD,БЕЗРАЗМЕРНЫЕ ВЕЛИЧИНЫ,УПРУГАЯ МОДЕЛЬ,ELASTIC MODEL,ДЕБИТ,WELL FLOW RATE,ЗАКОН ДАРСИ,DARCY'S LAW,УРАВНЕНИЯ ДВИЖЕНИЯ,EQUATIONS OF MOVEMENT,ГЕОСТАТИЧЕСКОЕ ДАВЛЕНИЕ,GEOSTATIC PRESSURE,ПРОНИЦАЕМОСТЬ,PERMEABILITY,ФИЛЬТРАЦИЯ,FILTRATION,МОДУЛЬ БИО,SIMULATION OF STRESS-DEFORMED STATE,CONNECTED PROBLEM,DIMENSIONLESS VALUE,BIO MODULUS

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
gold