Wellbore stability analysis and well path optimization based on the breakout width model and Mogi–Coulomb criterion

Ma, Tianshou; Chen, Ping; Yang, Chunhe; Zhao, Jun

doi:10.1016/j.petrol.2015.10.029

Cited by 102 publications

(60 citation statements)

References 46 publications

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“…Debonding, radial cracking, and disking can be determined with the maximum tensile stress criterion, while shear failure can be determined with the Mohr-Coulomb Criterion or the Mogi-Coulomb Criterion. Compared to the Mogi-Coulomb Criterion, because the Mohr-Coulomb Criterion does not consider the effect of intermediate principal stress on the strength of the material, it cannot reflect the real failure under a true tri-axial stress state in the rock [15,16]. The Mogi-Coulomb Criterion was selected in the paper.…”

Section: Failure Criterion and Safety Factor For Cement Sheathmentioning

confidence: 99%

Influences of Fracturing Fluid Injection on Mechanical Integrity of Cement Sheath under Four Failure Modes

Peng

et al. 2018

Energies

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The significant decreased wellbore temperature and increased casing pressure during fracturing fluid injection present a big challenge for the mechanical integrity of cement sheath in fracturing wells. Based on the theories of elastic mechanics, thermodynamics, and a multi-layer composed thick-wall cylinder, this paper proposed a new mechanical model of cement sheath for fracturing wells, coupling pressure, and thermal loads, which consider the failure modes of de-bonding, radial cracking, disking, and shear failure. The radial nonuniform temperature change and the continuous radial stress and radial displacement at two interfaces have been considered. With the proposed model, the radial distributions of failure stress and the corresponding safety factor for cement sheath during fracturing fluid injection have been analyzed and compared under four failure modes. Results show that the decreased wellbore temperature will produce significant tri-axial tensile stress and induce cement failure of de-bonding, radial cracking, and disking. The increased casing pressure will significantly lower the risk of de-bonding but also aggravate radial cracking and shear failure. For integrity protection of cement sheath, increasing the injected fluid temperature, maintaining higher circulation pumping pressures, and adopting cement sheath with a low elasticity modulus have been suggested for fracturing wells.

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Section: Failure Criterion and Safety Factor For Cement Sheathmentioning

confidence: 99%

Influences of Fracturing Fluid Injection on Mechanical Integrity of Cement Sheath under Four Failure Modes

Peng

et al. 2018

Energies

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“…In order to be against this increase of deviatoric stress, an object of higher drilling fluid density should be designed. For this case, based on the formation condition and rock mechanical properties by CTC testing, the drilling fluid density designed by the method from Ma et al [25] and Ma and Chen [26] must be larger than 1.017 g/cm 3 to avoid wellbore collapse ( Figure 15). In real scenarios, the decrease of drilling fluid density was much faster than expected.…”

Section: A Field Case Of the Well Collapse Problem During The Processmentioning

confidence: 99%

Mechanical Behavior and Permeability Evolution of Reconstituted Coal Samples under Various Unloading Confining Pressures—Implications for Wellbore Stability Analysis

et al. 2017

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Low pressure, low permeability, and low saturation of Chinese coal-bed methane (CBM) reservoirs make underbalanced drilling (UBD) widely used for mining CBM in China. In this study, mechanical behavior and permeability of coal rock were investigated under different degrees of unloading confining pressure (UCP)-reloading axial stress (RAS) by a triaxial experimental apparatus. These tests revealed that: (1) peak deviatoric stress of coal rock in UCP-RAS is lower than that in a conventional triaxial compression (CTC) test, and the peak deviatoric stress linearly relates the degree of unloading confining pressure. The deformation modulus of coal in UCP-RAS is lower than that in CTC, while the lateral expansion ratio is larger than that in CTC; (2) higher UCP leads to a faster increase of permeability during RAS until the failure of coal; (3) the cohesion and internal friction angle tested by UCP-RAS are lower by 4.57% and 15.18% than those tested by CTC. In addition, a field case (Zhaozhuang well, Qinshui Basin, China) of a well collapse problem validates the higher probability of wellbore collapse due to the increase of equivalent collapse fluid density, which is calculated by using coal rock parameters tested by UCP-RAS rather than by CTC.

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“…22,23, and these technologies has advanced from real-timized to digitized, visual, automated, integrated and intelligentized (Ma and Chen 2015). However, the challenges of directional drilling are different with the vertical deep drilling, and can be concluded as follows (Allen et al 1997;Walker et al 2009;Gao et al 2009;Walker 2012;Gupta et al 2014;Yan et al 2014;Ma et al 2015a;Liu et al 2016b):…”

Section: Top 15? Deepest Wells and Challengesmentioning

confidence: 99%

“…On the other hand, to exploit unconventional petroleum resources, more and more non-vertical wells, such as directional well, highly-deviated well, extended reach well, horizontal well and etc., are utilized. For example, the extended reach wells and horizontal wells are usually used to develop the offshore oil and gas, mainly due to the required number of platforms can be reduced (Ma et al 2015a); the horizontal wells are usually used to develop the tight oil and gas, shale oil and gas, mainly due to the drainage area can be enlarged and it's good for multistage fracturing, as a result, enhanced oil and gas recovery (Ma et al 2015a). Thus, the vertical and directional drilling are the key technologies for the exploration and exploitation of oil and gas resources, and they are also the very important ways to exploit deep geothermal energy and geo-resources (Elders et al 2014), conduct international continental scientific drilling program (ICDP) .…”

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confidence: 99%

Overview on vertical and directional drilling technologies for the exploration and exploitation of deep petroleum resources

Chen

Zhao

2016

Geomech. Geophys. Geo-energ. Geo-resour.

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The vertical and directional drilling are the key technologies for the exploration and exploitation of oil and gas resources in deep formations. Meanwhile, they are also the very important ways to exploit deep geothermal energy and geo-resources, conduct international continental scientific drilling program. The aim of the present overview is to review and discuss the vertical and directional drilling technologies and their recent developments since the pioneering work in 1890s. It starts with the historical development and classification of main drilling methods for petroleum extraction, such as the vertical drilling, directional drilling and horizontal drilling, and the main application scopes of these methods are also discussed. Then, the developments of the directional techniques, the main directional tools (deflection tools, down-hole motor, rotary steerable drilling system and vertical drilling system), the directional survey techniques (measuring and transmission techniques), the main drill bits (roller cone bits, fixed cutter bits and hybrid bits), and the main drilling fluids (gasbase drilling fluid, water-based drilling fluid and oilbased drilling fluid) are summarized and analyzed. The top 15? deepest and top 20? longest wells all over the world are collected from related literatures to analyze the achievements of vertical and directional drilling in petroleum industry, the challenges of vertical and directional drilling are also discussed. Finally, a brief summary and prospect of vertical and directional drilling are presented.

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Wellbore stability analysis and well path optimization based on the breakout width model and Mogi–Coulomb criterion

Cited by 102 publications

References 46 publications

Influences of Fracturing Fluid Injection on Mechanical Integrity of Cement Sheath under Four Failure Modes

Influences of Fracturing Fluid Injection on Mechanical Integrity of Cement Sheath under Four Failure Modes

Mechanical Behavior and Permeability Evolution of Reconstituted Coal Samples under Various Unloading Confining Pressures—Implications for Wellbore Stability Analysis

Overview on vertical and directional drilling technologies for the exploration and exploitation of deep petroleum resources

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