Study on Wellbore Stability and Instability Mechanism in Piedmont Structures

Piedmont tectonic belts are rich of oil and gas resources, however the intense tectonic stress and broken formation may cause great drilling problems in piedmont structures such as borehole collapse, lost circulation and gas cutting. Through analysis of in situ stress properties, bedding structure and mechanical characteristics, wellbore instability mechanism was expounded from rock mechanics, chemistry of drilling fluid and drilling technology. The high tectonic stress, formation strength decreasing and fluid pressure rising after mud filtrate seepage are main reasons for borehole collapse. The methods of calculating collapse and fracture pressure and determining drilling safety density window were put forward based on mechanical analysis. In order to reduce drilling problems in piedmont structures, some countermeasures should be taken from optimizing well track and casing program, using proper mud density, improving inhibitive and sealing ability of drilling fluid. Good sealing ability can reduce seepage and cut off pressure transmission, enhancing the effective support force. This is the key technology of maintaining wellbore stability in hard brittle shale in piedmont structures.

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The Research of the Oil Base Drilling Fluid Hard Brittle Shale Sidewall Instability Mechanism

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.513-517.309 ◽

2014 ◽

Vol 513-517 ◽

pp. 309-313 ◽

Cited By ~ 1

Author(s):

Guang Feng Zhen ◽

Go Lin Jing ◽

Wei Jie Hu ◽

Bai Sun Liao

Keyword(s):

Drilling Fluid ◽

Continuous Production ◽

Exchange Capacity ◽

Wellbore Stability ◽

Instability Mechanism ◽

X Ray Diffraction ◽

X Ray ◽

Mechanism Research ◽

Shale Formation ◽

Temperature Time

With the continuous production of the well development, sidewall instability phenomenon has become increasingly serious, mostly occurs in the shale formation, benefit for oilfield produced great harm. Water-based drilling fluid sidewall instability mechanism has been basically clear, the oil-base drilling fluid influence on sidewall stability is not yet concrete. So this paper mainly for oil-based drilling fluid hard brittle shale sidewall instability mechanism research. This article first from the perspective of chemistry, the hard brittle shale borehole wall instability is studied, the experiment tested respectively by the white oil and water treatment of hard brittle shale of cation exchange capacity (CEC) value, so as to analyze the same and the hydration of clay mineral equivalent after processing samples, through analysis of the temperature, time, media's impact on hard brittle shale wellbore stability. Secondly, from the Angle of mechanics, stress and mechanical properties of mud shale formation is analyzed, and the minimum drilling fluid density model, gives a variety of analysis and calculation formula. In addition, this paper adopted the X ray diffraction (XRD)

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The identity policy and its effect in the stability of Middle East after 2010

Tikrit Journal For Political Science ◽

10.25130/poltic.v0i0.174 ◽

2019 ◽

pp. 434

Author(s):

Ali Hussein Kadhim Alesammi

Keyword(s):

Middle East ◽

International Relations ◽

Social Construct ◽

Stability And Instability ◽

The Social ◽

The Stability ◽

International Interactions ◽

Regional Interests ◽

Political Groups ◽

Identity Policy

Since 2010 Middle East have many events or what they call "Arab spring events" which it result of overthrow governments and the rise of new political groups, all of this elements was resulting of many international and regional activities and making new regional and international axles, as well as the intersections of the different regional interests, therefore this research will try to study the stability and instability in the region as an independent variable not according to the neorealism or neoliberalism theories, but according to the constructivism theory which it base their assumptions on: "In the international relations the non-physical structures of international interactions are determined by the identities of the players, which in turn determine the interests that determine the behavior of international players." So the research questions are: 1-What is the identity policy and haw affect in international relations? 2-How the social construct affect in international relations? 3-How the elite's identities for the main actors in the Middle East affect in the regional axles?

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Integrating Wireline Measurements to Provide Geomechanical Solutions: A Case Study for Optimizing Drilling by Improving Wellbore Stability in a Complex and Tectonically Active Region

10.2523/18908-ms ◽

2016 ◽

Author(s):

Sunit Roy ◽

G. K. S Roy ◽

R. S. Chauhan ◽

Somesh Bahuguna ◽

Joseph Zacharia ◽

...

Keyword(s):

Active Region ◽

Wellbore Stability ◽

Tectonically Active

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In-Situ Stresses, Rock Strength, Fluid Pressure, And Implications For Wellbore Stability And Oil And Gas Development In The Seboro and Tiaka Fields, Sulawesi, Indonesia

10.29118/ipa.0.12.e.073 ◽

2018 ◽

Author(s):

William Power

Keyword(s):

Oil And Gas ◽

Rock Strength ◽

Fluid Pressure ◽

Wellbore Stability ◽

Oil And Gas Development ◽

In Situ Stresses

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Scientific and technological aspects and prospects for application of cryogenic drilling technology

Oil and Gas Studies ◽

10.31660/0445-0108-2020-3-54-62 ◽

2020 ◽

pp. 54-62

Author(s):

A. B. Tulubaev ◽

E. V. Panikarovskii

Keyword(s):

Low Temperatures ◽

Western Siberia ◽

Wellbore Stability ◽

Drilling Mud ◽

Chemical Reagent ◽

Production Chain ◽

Foreign Experience ◽

Permafrost Rocks ◽

The North ◽

Drilling Technology

In the article, we analyze types of drilling mud, which are used to drilling intervals of permafrost rocks; the importance of wellbore stability is noted. Wedescribethemain technologies, which have been being applied in the north of Western Siberia; these technologies are aimed at minimizing the loss wellbore stability due to violation of the temperature conditions in the well. We also analyze hydrocarbon systems, taking into account foreign experience, which is based on prospecting and exploratory drilling of ice deposits in Greenland and Antarctica. The article draws your attention to using synthetic fluids, monoesters and chladones. The difficulties of the existing technology and the disadvantages of the hydrocarbon systems are highlighted. We propose to apply a new cryogenic drilling technology, which consists in the use of synthetic fluorine-containing agents as flushing fluid at low temperatures. The text gives valuable information on composition of the proposed flushing fluid and the prospects of using the technology to prevent complications. Much attention is given to issue of manufacturing the main chemical reagent with the reduction of the generalized production chain of its production from the starting material, it is fluorspar.

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