Thermal performance analysis of drilling horizontal wells in high temperature formations

Li, Mengbo; Liu, Gonghui; Li, Jun; Tao, Zhang; He, Miao

doi:10.1016/j.applthermaleng.2014.12.055

Cited by 71 publications

(15 citation statements)

References 16 publications

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“…The temperature of the formation is mainly related to the temperature gradient and depth, so the temperature distribution model along the vertical direction can be expressed as [28]:…”

Section: Initial Conditionsmentioning

confidence: 99%

Analysis of Coupled Wellbore Temperature and Pressure Calculation Model and Influence Factors under Multi-Pressure System in Deep-Water Drilling

Zhang

Liu

et al. 2019

Energies

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The purpose of this paper is to discuss the variation of wellbore temperature and bottom-hole pressure with key factors in the case of coupled temperature and pressure under multi-pressure system during deep-water drilling circulation. According to the law of energy conservation and momentum equation, the coupled temperature and pressure calculation model under multi-pressure system is developed by using the comprehensive convective heat transfer coefficient. The model is discretized and solved by finite difference method and Gauss Seidel iteration respectively. Then the calculation results of this paper are compared and verified with previous research models and field measured data. The results show that when the multi-pressure system is located in the middle formation, the temperature of the annulus corresponding to location of the system is the most affected, and the temperature of the other areas in annulus is hardly affected. However, when the multi-pressure system is located at the bottom hole, the annulus temperature is greatly affected from bottom hole to mudline. In addition, the thermo-physical parameters of the drilling fluid can be changed by overflow and leakage. When only overflow occurs, the annulus temperature increases the most, but the viscosity decreases the most. When only leakage occurs, the annulus temperature decreases the most and the viscosity increases the most. However, when the overflow rate is greater than the leakage rate, the mud density and bottom-hole pressure increase the most, and both increase the least when only leakage occurs. Meanwhile, bottom-hole pressure increases with the increase of pump rate but decreases with the increase of inlet temperature. The research results can provide theoretical guidance for safe drilling in complex formations such as multi-pressure systems.

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“…The temperature of the formation is mainly related to the temperature gradient and depth, so the temperature distribution model along the vertical direction can be expressed as [28]:…”

Section: Initial Conditionsmentioning

confidence: 99%

Analysis of Coupled Wellbore Temperature and Pressure Calculation Model and Influence Factors under Multi-Pressure System in Deep-Water Drilling

Zhang

Liu

et al. 2019

Energies

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“…According to works [13,15,17], the first three assumptions enumerated above primarily pertained to the temperature of vertical wells. Although Li [17] analyzed the temperature of horizontal wells, the investigation did not include the effect of hydraulic friction, which was different from what we conducted in this study. As described in Section 2.1, heat transfer not only occurred within solid parts and fluid zones, but also transpired at interfaces between solids and fluids.…”

Section: Mathematical Model Of Heat Transfermentioning

confidence: 99%

“…Yang [15] probed the wellbore-stratum temperature, which encountered the loss of drilling fluid. In addition to the finite element method mentioned above, other solving algorithms were still applied, such as the finite volume method [16,17], artificial neural network [18], and semi-analytical method [19].…”

Section: Introductionmentioning

confidence: 99%

“…Nguyen and Miska [25], who made derivations based on the investigation conducted by Kabir and Hasan on the temperature of a vertical well and considered the mechanical friction between drill pipes and wellbore wall, employed an analytical model to predict the circulating temperature of horizontal wells, but ignored the effect of hydraulic friction. The work completed by Li and Liu [17] on the temperature of horizontal wells included information on the heat source of viscous dissipation, which was similar to the hydraulic friction in drilling fluids and other mechanical frictions. Nevertheless, the study would have been more comprehensive if the effect of the key parameter, Nu, was considered.…”

Section: Introductionmentioning

confidence: 99%

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Heat Transfer Behaviors in Horizontal Wells Considering the Effects of Drill Pipe Rotation, and Hydraulic and Mechanical Frictions during Drilling Procedures

et al. 2018

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Horizontal wells are increasingly being utilized in the exploration and development of oil and gas resources. However, the high temperature that occurs during drilling processes leads to a number of problems, such as the deterioration of drilling fluid properties and borehole instability. Therefore, the insight into heat transfer behaviors in horizontal wells is certainly advantageous. This study presents an integrated numerical model for predicting the temperature distribution during horizontal wells drilling considering the effects of drill pipe rotations, and hydraulic (i.e., circulating pressure losses) and mechanical frictions. A full implicit finite difference method was applied to solve this model. The results revealed that the mechanical frictions affect more on wellbore temperature variation than the effects of heat transfer intensification and circulating pressure losses; Moreover, the drilling fluid temperature was found higher than the stratum temperature at horizontal section, the temperature difference at the bottom hole reached up to 16 °C if pressure drops, heat transfer strengthened by rotations and mechanical frictions were all taken into account. This research could be utilized as a theoretical reference for predicting temperature distributions and estimating risks in horizontal wells drilling.

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“…In view of the fact that the temperature field of the CCFS would change dynamically with the alternation of fluid injection and pumping termination in the staged fracturing operation process of shale gas well which results a temporal variation of load during the transient heat transfer. Therefore, 12 time incremental steps were set up for the model herein [11][12][13]. Fluid injection and pumping termination were carried out alternately, where the injection time was 1h, the pumping termination time was 2 h, and the total length of time was 18 h. Model parameter setting: (1) Initial formation temperature is 100 • C; during the winter, since the injection fluid temperature will be lower than summer, so the injection fluid temperature is set to 0 • C. The results of staged finite element calculation are shown in Figure 5.…”

Section: Case Studymentioning

confidence: 99%

New Method to Analyse the Cement Sheath Integrity During the Volume Fracturing of Shale Gas

Fan

Liu

2018

Energies

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Accurate prediction of the hoop stress distribution of the cement sheath and its variation regularities during volume hydraulic fracturing in shale formations is of great significance for maintaining the wellbore integrity of shale gas horizontal wells. A finite element model of casing-cement sheath-formation system (CCFS) coupling between stresses and temperature was established through a staged finite element method based on the elastic anisotropy of shale. With this new model, the effects of operation parameters and formation mechanical property changes on the cement sheath hoop stress during the multi-stage hydraulic fracturing process were analyzed, and the results were compared with the conventional model. The results revealed that the increase of the temperature of the fracturing fluid could reduce the hoop stress of the cement sheath, which decreased gradually with the decreasing elastic modulus of the cement sheath, and eventually changed to compressive stress from tensile stress. The hoop tensile stress of the cement sheath increases first and then tends to decrease with the increasing internal casing pressure, the larger the local formation stress, the smaller the pore pressure and the smaller the hoop tensile stress of the cement sheath it preforms. The findings of this paper are of great guiding significance to the research of the cement sheath stress variations during volume fracturing in shale formations and to the optimization of fracturing design.

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Thermal performance analysis of drilling horizontal wells in high temperature formations

Cited by 71 publications

References 16 publications

Analysis of Coupled Wellbore Temperature and Pressure Calculation Model and Influence Factors under Multi-Pressure System in Deep-Water Drilling

Analysis of Coupled Wellbore Temperature and Pressure Calculation Model and Influence Factors under Multi-Pressure System in Deep-Water Drilling

Heat Transfer Behaviors in Horizontal Wells Considering the Effects of Drill Pipe Rotation, and Hydraulic and Mechanical Frictions during Drilling Procedures

New Method to Analyse the Cement Sheath Integrity During the Volume Fracturing of Shale Gas

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