نتایج جستجو برای: In Situ Stresses

تعداد نتایج: 16980983  

Journal: :journal of petroleum science and technology 0
mohammadreza zare reisabadi research institute of petroleum industry seyyed saeed ghorashi research institute of petroleum industry

knowledge of the orientation of horizontal in situ stresses is important to some areas of oil and gas field development plans. borehole breakouts observed in image logs and drilling-induced fractures are the main parameters for the determination of the stresses’ directions in situ. in this work, the orientations of borehole breakouts were investigated as a function of depth in oil wells a and b...

In this research attempts were made to estimate the in-situ stresses acting on a hydrocarbon reservoir based on routine activities of acid injection in oil reservoir. It was found that the relation between the re-opening pressure of fracture and principal in-situ stresses can be estimated using rock mechanics equations for the circular underground cavities. An appropriate relation between the m...

2015

Rock at depth is subjected to stresses resulting from the weight of the overlying strata and from locked in stresses of tectonic origin. When an opening is excavated in this rock, the stress field is locally disrupted and a new set of stresses are induced in the rock surrounding the opening. Knowledge of the magnitudes and directions of these in situ and induced stresses is an essential compone...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه زابل - دانشکده کشاورزی 1392

این پژوهش به منظور بررسی تغییرات ترکیبات شیمیایی و ارزش غذایی سیلوی علوفه نی با افزودن برگ توت، آردجو و آنزیم به روش in vitro و in situ انجام شد. بدین منظور علوفه نی جمع آوری و جهت سیلو نمودن به قطعات 4-2 سانتی متری خرد گردید. سپس با استفاده از برگ توت ( 40 درصد)، آرد جو (10 درصد) و آنزیم به مقدار توصیه شده ( 3 گرم به ازای هر کیلوگرم ماده خشک) قبل از سیلو مخلوط و درون سطل های 5 کیلویی پلاستیکی ...

Numerical modelling techniques are not new for mining industry and civil engineering projects anymore. These techniques have been widely used for rock engineering problems such as stability analysis and support design of roadways and tunnels, caving and subsidence prediction, and stability analysis of rock slopes. Despite the significant advancement in the computational mechanics and availabili...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان 1371

the effect of the presence of perforations on he stresses of a plate is a problem which is of great interest in structural design and in the mathemattical theory of elasticity. among the many hole patterns that are likely to require consideration is the ring of equally spaced circular holes. the present worke investigates stress & strain analysis of a thin isotropic circular plate containing a ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه زابل - دانشکده کشاورزی 0

این پژوهش به منظور بررسی تغییرات ترکیب شیمیایی و ارزش غذایی سیلوی سورگوم با افزودن مولتی آنزیم و مخمر به روش in vitro و in situ انجام شد. بدین منظور علوفه سورگوم در مرحله شیری بودن دانه ها در خرداد ماه برداشت و جهت سیلو نمودن به قطعات 4 - 2 سانتی متری خرد گردید. سپس با استفاده از مولتی آنزیم در سه سطح(صفر،3 و 6 گرم در کیلوگرم ماده خشک) و مخمر ساکارومایسیس سرویسیه در سه سطح(صفر، 5/2 و 5گرم در کی...

Nowadays acoustic emission (AE) testing based on the Kaiser Effect (KE) is increasingly used to estimate the in-situ stress in laboratories. In this work, this effect is assessed on cylindrical specimens in numerical simulations of the cyclic loadings including loading, unloading, and re-loading cycles using a 3D code called the particle flow code (PFC) based upon the distinct element method. T...

The image logs interpretation from two wells in a fold hosting a west Iranian oil field located in the Dezful Embayment, SW Iran reveal the occurrence of two major systems of natural fractures. In the central part of the fold, the fold-related fractures include two sets of fractures trending N53°E and N34°E. In the eastern and also curved part of the fold, the strike of open fractures varies fr...

Knowledge of the orientation of horizontal in situ stresses is important to some areas of oil and gas field development plans. Borehole breakouts observed in image logs and drilling-induced fractures are the main parameters for the determination of the stresses’ directions in situ. In this work, the orientations of borehole breakouts were investigated as a function of depth in oil wells A and ...

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