A coupled conductive–convective thermo-poroelastic solution and implications for wellbore stability

Wang, Yarlong; Dusseault, Maurice B.

doi:10.1016/s0920-4105(03)00032-9

Cited by 120 publications

(47 citation statements)

References 10 publications

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“…This effect can be a major advantage for a drilling operation, reducing the rate of bottom-hole sloughing, mass transfer, and related problems. On the other hand, consider the drilling fluid temperature at the casing shoe in Figure 2.39; it is much higher than the formation temperature, and this causes effects opposite to those listed above, which in many cases are known to lead to accelerated sloughing and hole-cleaning problems (Wang and Dusseault, 2003). Figure 2.40 shows approximately the shape of the tangential stress distribution that one might expect from heating or cooling the borehole wall.…”

Section: Heating and Cooling The Boreholementioning

confidence: 99%

“…These processes affect physical parameters such as permeability; hence rigorous analysis of rock stresses in drilling is a fully coupled thermal-hydraulic-mechanical-chemical problem. In the elastic behavior range, at least a Biot formulation is required (e.g., Wang and Dusseault, 2003), and generally effects of elastic non-linearity, plasticity, and rupture will arise. Clearly, constitutive behavior is also a vital aspect of analysis in geomechanics.…”

Section: Stress Boundary Conditionsmentioning

confidence: 99%

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Principles of Drilling and Excavation

Han

Dusseault

Detournay

et al. 2009

Drilling in Extreme Environments

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Predicting the performance of drills requires analytical capabilities that account for the tools characteristics, rock properties and behavior, the temperature, and other parameters. Also, it necessitates understanding the effect of the applied forces, details of the bit, and the interaction with the drilled rock. This chapter covers the principles of drilling and excavation, both analytically and experimentally, and the requirements for optimization of the drilling operation. Physical Properties of Rocks Terrestrial RocksThe vast array of terrestrial rocks can be simplified into a few basic types. One useful classification scheme is to group rocks via their mode of origin, specifically into igneous, sedimentary, and metamorphic rock types. Igneous rocks are those that solidified directly from a molten state, of which basalt is the prime example. Such rocks can be glassy if quickly cooled, or fully crystalline if allowed to cool slowly. Sedimentary rocks, in contrast, are composed of individual mineral or lithic fragments that have been transported and deposited in layers or strata. These strata have been compacted or re-cemented to form a rock-like mass. Finally, metamorphic rocks are igneous or sedimentary rocks that have altered during burial by heat and/or pressure. The original rock fabric, textures, and mineral assemblages are gradually replaced or overprinted as metamorphism progresses.Drilling in Extreme Environments. Edited by Yoseph Bar-Cohen and Kris Zacny Rock response to external loading depends not only on the level of applied loads, but also on rock properties. Based on their functionalities, there are three categories of rock properties often used in the analysis of rock behavior:. Elastic properties such as Youngs modulus, shear modulus, bulk modulus, Poissons ratio, bulk compressibility, and grain or matrix compressibility. They define rock elastic deformation. . Strength properties describing the loading limit a rock could afford and its plastic behavior. There are several strength variables, such as cohesive strength, tensile strength, compressive strength, and internal friction angle. . Transport properties, for example, rock porosity and permeability, describe the ability of fluid to pass through a rock.These properties are essential for any analytical or numerical effort to describe or predict rock mechanical behavior. The reliability of their values is at least as important as the prediction method itself, if not more so. Rock properties from these categories are not independent. Often, it is found that they are related to each other either directly or indirectly. For example, rocks with high strength are likely to have high modulus, low Poissons ratio, and low porosity. In this section, we will first describe each rock property and its connection with others; then, we will briefly discuss the two methods generally applied to determine its value. 2.2.

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Section: Heating and Cooling The Boreholementioning

confidence: 99%

Section: Stress Boundary Conditionsmentioning

confidence: 99%

Principles of Drilling and Excavation

Han

Dusseault

Detournay

et al. 2009

Drilling in Extreme Environments

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“…Numerical results were validated with appropriate analytical solutions presented by Ghassemi and Diek (2003), Ghassemi et al (2009) and Ekbote (2002). To verify the numerical results of solute advection and thermal convection the analytical solutions presented by Zoppou and Knight (1997) and Wang and Dusseault (2003) are used. Details of validation procedures can be found in Rahman (2010, 2011).…”

Section: Model Description and Validationmentioning

confidence: 99%

A Non-Isothermal Constitutive Model for Chemically Active Elastoplastic Rocks

Roshan

Oeser

2011

Rock Mech Rock Eng

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Hydration/dehydration of water-active rocks under non-isothermal conditions is encountered in many industries, in particular the drilling industry. Water-active rocks can adsorb water on their basal crystal surfaces on both the external, and, in the case of expanding lattice clays, the inter-layer surfaces. There are two main mechanisms in which the instability may occur for a structure built in water-active rocks. First mechanism is the change in stresses resulted from mechanical, hydraulic, chemical and thermal interaction, which we formulate based on the concept of non-equilibrium thermodynamics. Second mechanism illustrates the change in mechanical properties of the rock due to physic-chemical interaction between the rock and exposed fluid. We postulate the later mechanism in terms of chemically active plastic deformation by using the modified Cam Clay model. The complete governing equations for non-isothermal chemo-poro-elastoplastic rock are therefore presented. A three-dimensional finite element model is then developed to solve the obtained governing equations. From the numerical results, it was found that the effect of temperature coupling term on stress cannot be ignored when non-isothermal conditions are encountered. However, this effect is almost trivial on pore pressure. It was also revealed that the effect of change in the shale's mechanical properties on stability due to physic-chemical interaction is as important as change in stresses due to mechanical, hydraulic, chemical and thermal interactions.

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“…For example, Mctigue [32], Kurashige [33] and Charlez [34] derived similar theoretical formulations that can be used for studying coupled thermo-poro-elasticity wellbore problems. By using the above theories, Zhou et al [35], Ghassemi and Diek [36], Wang and Dusseault [37], Choi et al [38] and Wu et al [39,40] studied the THM behaviors around a wellbore or sphere. Li et al [41] and Abousleiman and Ekbote [42] and Gao et al [43] applied the LDS to an inclined wellbore in an isotropic and transversely isotropic THM medium.…”

Section: Introductionmentioning

confidence: 99%

A Transient Analytical Model for Predicting Wellbore/Reservoir Temperature and Stresses during Drilling with Fluid Circulation

Liu

Zhang

et al. 2017

Energies

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Accurate characterization of heat transfer in a wellbore during drilling, which includes fluid circulation, is important for wellbore stability analysis. In this work, a pseudo-3D model is developed to simultaneously calculate the heat exchange between the flowing fluid and the surrounding media (drill pipe and rock formation) and the in-plane thermoelastic stresses. The cold drilling fluid descends through the drill pipe at constant injection rates and returns to the ground surface via the annulus. The fluid circulation will decrease the wellbore bottom temperature and reduce the near-wellbore high compressive stress, potentially leading to tensile fracturing of the well. The governing equations for the coupled heat transfer stress problem are formulated to ensure that the most important parameters are taken into account. The wellbore is subject to a non-hydrostatic in situ far-field stress field. In modeling heat exchange between fluid and surrounding media, the heat transfer coefficients are dependent on fluid properties and flow behavior. Analytical solutions in the Laplace space are obtained for the temperatures of the fluid in both the drill pipe and annulus and for the temperature and stress changes in the formation. The numerical results in the time domain are obtained by using an efficient inversion approach. In particular, the near-well stresses are compared for the cases with fixed and time-dependent cooling wellbore conditions. This comparison indicates that the using a fixed temperature wellbore conditions may over-estimate or under-estimate the bottom-hole stress change, potentially leading to wellbore stability problems.

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A coupled conductive–convective thermo-poroelastic solution and implications for wellbore stability

Cited by 120 publications

References 10 publications

Principles of Drilling and Excavation

Principles of Drilling and Excavation

A Non-Isothermal Constitutive Model for Chemically Active Elastoplastic Rocks

A Transient Analytical Model for Predicting Wellbore/Reservoir Temperature and Stresses during Drilling with Fluid Circulation

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