Thermal effect on wellbore stability during drilling operation with long horizontal section

Li, Mengbo; Liu, Gonghui; Li, Jun

doi:10.1016/j.jngse.2015.01.027

Cited by 19 publications

(3 citation statements)

References 20 publications

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“…With the increase in oil and gas exploration and development, the research frontier of the petroleum industry has gradually shifted to the development of land deep oil and gas reservoirs and deep-water drilling. , Complex geological conditions result in drilling operations facing engineering problems such as abnormally high temperature, high pressure, and narrow safe density window, resulting in frequent downhole complex accidents such as lost circulation. , In addition, borehole temperature is not only an important parameter for wellbore stability analysis and drilling design but also has a significant impact on drilling fluid properties and cementing quality. − Moreover, under the loss condition, the fluid in the annulus is in an unsteady-state flow, and the leaked fluid also reduces the formation temperature near the wellbore and changes the original temperature and pressure distribution in the wellbore, which seriously affect the physical parameters such as drilling fluid density and viscosity, making the loss situation more complex. − Therefore, studying the variation law of wellbore temperature and pressure in the process of lost circulation is of great significance for safe and efficient drilling.…”

Section: Introductionmentioning

confidence: 99%

Solution and Analysis of Wellbore Temperature and Pressure Field Coupling Model under Lost Circulation

et al. 2022

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The fluid in the annulus is in a variable mass flow state under the lost circulation condition, significantly affecting wellbore pressure distribution and the heat transfer efficiency between wellbore and formation. Therefore, based on the hydrodynamics and energy conservation law, a coupling model of transient wellbore temperature and pressure field under lost circulation conditions is established, which fully considers the casing program, bottom hole assembly, and heat source generated in drilling, as well as the influence of the temperature and pressure coupling in wellbore on the physical parameters of drilling fluid. The calculation results of the model in this paper are in good agreement with the field measured data and the previous research results, which verifies the rationality and accuracy of the model in this paper. The effects of the loss rate and the lost circulation zone location on the wellbore temperature and pressure distribution are analyzed, and the variation rule of the physical parameters of drilling fluid under the lost circulation condition is studied. The numerical simulation results show that the density and viscosity of drilling fluid in the annulus and bottom hole pressure increase with the increase in the circulation time; the annulus temperature decreases gradually with the increase in cycle time and tends to become stable after 8 h of the cycle. The annulus temperature and bottom hole pressure decrease with the increase in loss rate and closeness of the loss zone to the well bottom. When the loss zone is in the upper open-hole section, an inflection point consistent with the location of the loss zone appears on the annular temperature difference curve between the loss circulation and the nonloss circulation, and the position of the loss zone can be judged according to the inflection point.

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Section: Introductionmentioning

confidence: 99%

Solution and Analysis of Wellbore Temperature and Pressure Field Coupling Model under Lost Circulation

et al. 2022

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“…Therefore, the accurate calculation of the stress state near wellbore is of great significance for judging whether the wellbore is unstable or not. With the development of analysis models for wellbore stability, it was found that the formation fluid, drilling fluid properties, and temperature have a great influence on the wellbore stability [9][10][11]. Mechanical behavior, pore pressure, and heat flux all 2 Mathematical Problems in Engineering influence wellbore stability, while instances of instability are a result of a combination of coupled effects.…”

Section: Introductionmentioning

confidence: 99%

Coupled THM Modelling of Wellbore Stability with Drilling Unloading, Fluid Flow, and Thermal Effects Considered

Jia

Wen

Deng

et al. 2019

Mathematical Problems in Engineering

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Both overbalanced drilling and underbalanced drilling will lead to the change of pore pressure around wellbore. Existing research is generally based on hydraulic-mechanical (HM) coupling and assumes that pore pressure near the wellbore is initial formation pressure, which has great limitations. According to the coupled theory of mixtures for rock medium, a coupled thermal-hydraulic-mechanical (THM) model is proposed and derived, which is coded with MATLAB language and ABAQUS software as the solver. Then the wellbore stability is simulated with the proposed model by considering the drilling unloading, fluid flow, and thermal effects between the borehole and the formation. The effect of field coupling on pore pressure, stress redistribution, and temperature around a wellbore has been analyzed in detail. Through the study of wellbore stability in different conditions, it is found that (1) for overbalanced drilling, borehole with impermeable wall is more stable than that of ones with permeable wall and its stability can be improved by reducing the permeable ability of the wellbore wall; (2) for underbalanced drilling, the stability condition of permeable wellbore is much higher than that of impermeable wellbore; (3) the temperature has important influence on wellbore stability due to the variation of pore pressure and thermal stress; the wellbore stability can be improved with cooling drilling fluid for deep well. The present method can provide references for coupled thermal-hydraulic-mechanical-chemical (THMC) process analysis for wellbore.

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“…[17][18][19] Near the bottom of the wellbore, thermal stress in the form of shrinkage is generated by the low temperature, while thermal stress in the form of expansion is generated in the upper wellbore section, which has a certain influence on the stress state of the wellbore rock. 20 Because the wellbore pressure is very low for gas drilling, it is no longer possible to use the collapse pressure to evaluate the wellbore stability. Therefore, this paper introduces the plastic softening radius and crushing radius of the surrounding rock to evaluate the wellbore stability for gas drilling.…”

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Analysis of borehole stability in gas drilling using a thermal elastoplastic coupling model

Zhu

Wang²,

Ye³

et al. 2021

Energy Science & Engineering

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Gas drilling technologies can increase the drilling speed, avoid loss circulation, and overcome formation water sensitivity. 1,2 Because the gas is less dense than mud, the borehole pressure is lower as the gas flows through the wellbore. The gas pressure is not sufficient to support the borehole rock and keep the borehole stable without deformation. After the borehole is drilled, its geometrical shape will inevitably deform under the original geostress. 3 In the initial stage of gas drilling engineering design, the formation properties and the stability of the borehole

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Thermal effect on wellbore stability during drilling operation with long horizontal section

Cited by 19 publications

References 20 publications

Solution and Analysis of Wellbore Temperature and Pressure Field Coupling Model under Lost Circulation

Solution and Analysis of Wellbore Temperature and Pressure Field Coupling Model under Lost Circulation

Coupled THM Modelling of Wellbore Stability with Drilling Unloading, Fluid Flow, and Thermal Effects Considered

Analysis of borehole stability in gas drilling using a thermal elastoplastic coupling model

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