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

Zhu, Zhongxi; Wang, Chaofei; Ye, Yuchen; Lei, Wanneng

doi:10.1002/ese3.992

Cited by 3 publications

(4 citation statements)

References 20 publications

(26 reference statements)

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“…Although the research on wellbore heat transfer of drilling fluid under no-loss circulation conditions has become mature, there are few studies on variable mass heat transfer of annulus fluid under loss circulation. − In 2017, Chen et al established the first variable mass heat transfer model in the wellbore under the lost circulation condition and also proposed a method to judge the position of the loss zone according to the temperature gradient curve. However, due to its failure to fully consider the heat source generated in the drilling process and the influence of the casing program on the wellbore temperature distribution, the model has a large error in the drilling process of deep and ultradeep wells.…”

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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“…During the drilling process, the wellbore temperature and pressure gradually increase in the vertical direction, and the mud density changes accordingly. The relationship between the three can be expressed by a partial differential equation, as shown in Equation () 33

\frac{d\rho (P,T)}{{dh}}=\frac{\partial \rho }{\partial P}\frac{{dP}}{{dh}}+\frac{\partial \rho }{\partial T}\frac{{dT}}{{dh}},

where

{dh}

denotes the spatial step size.…”

Section: Mud Performance Testing Under High Temperature and High‐pres...mentioning

confidence: 99%

“…The relationship between the three can be expressed by a partial differential equation, as shown in Equation (1). 33     dρ P T dh…”

Section: Mud Density Regression Modelmentioning

confidence: 99%

“…Marshall and Bentsen 30 provided four partial differential energy equations applicable to the drilling column, within the drilling column, in the annulus, and in the formations to solve the non-steady state heat transfer in the wellbore. Zhu et al [31][32][33] considered the influence of high temperature on wellbore drilling fluid circulation under different circumstances, and established a transient wellbore flow model suitable for dry hot rock, drilling fluid leakage or gas drilling. However, in the above methods, the physical properties of mud, such as density and viscosity, are treated as constants.…”

Section: Introductionmentioning

confidence: 99%

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Numerical study of temperature–pressure coupling model for the horizontal well with a slim hole

Huang

et al. 2022

Energy Science & Engineering

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Horizontal wells with a slim hole (HW-SH), characterized by high productivity, high environmental protection, and low cost are gradually being introduced into oil and gas extraction processes in high-temperature and high-pressure formations. However, the HW-SH annulus is narrow, and the distributions of temperature and pressure in the wellbore are very different from those of conventional horizontal wells. Furthermore, the mud properties change under the influence of high temperature and pressure. In this study, a numerical model of the transient temperaturepressure coupling field in an HW-SH wellbore was developed based on high-temperature and high-pressure performance tests of mud, combined with the characteristics of a narrow annulus in HW-SH. Subsequently, the effects of the ground temperature gradient, displacement, drill pipe speed, annulus size, and joint size on the temperature-pressure coupling field were analyzed. Measured data from the HW-SH drilled in the Mahu field in China were used to validate the developed model. The results showed that the ground temperature had a significant effect on the mud density and rheological properties. As the temperature increased, the mud density decreased, and its rheological properties improved. Although pressure also has a large effect on density, it has a negligible effect on the rheological properties of the mud. The coupled temperature-pressure field model for HW-SH considering the effects of the temperature and narrow annulus can predict the annulus temperature and pressure with an accuracy of up to 97%. The ground temperature gradient has the greatest influence on the HW-SH annular temperature, larger than that of the displacement. In addition, the annular size, rotation speed of the drill pipe, and joint size have almost no influence on the annular temperature. Compared to those of conventional horizontal wells, the rotational speed, annulus size, and joint size of the HW-SH have a greater impact on the annulus pressure.

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Research on Wellbore Temperature Control Method of Water-Based Drilling Fluid

Ye,

Guo,

Zhang

et al. 2024

Mechanisms and Machine Science

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

Cited by 3 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

Numerical study of temperature–pressure coupling model for the horizontal well with a slim hole

Research on Wellbore Temperature Control Method of Water-Based Drilling Fluid

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