Impact of wellbore fluid properties on trapped annular pressure in deepwater wells

Zhang, Bo; Guan, Zhichuan; Sheng, Yanan; Wang, Qing; Xu, Chuanbin

doi:10.1016/s1876-3804(16)30104-5

Cited by 17 publications

(3 citation statements)

References 17 publications

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“…Limited by the value ranges and the units of different factors, it is hard to directly compare the sensitivities of the influencing factors. For this reason, a Frontiers in Physics frontiersin.org new dimensionless index is proposed by Zhang et al [44], which is called the ratio of standard deviation coefficient. To eliminate the impact of the factors' units, this index is the ratio of the standard deviation coefficient of wellhead temperature and influencing factor.…”

Section: Evaluation Of the Influencing Factorsmentioning

confidence: 99%

Sensitivity analysis of the temperature profile changing law in the production string of a high-pressure high-temperature gas well considering the coupling relation among the gas flow friction, gas properties, temperature, and pressure

Cao

Sun

Zhang³

et al. 2022

Front. Phys.

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The temperature profile plays an important role in well integrity, flow assurance, and well test. Meanwhile, the impact of engineering conditions should not be ignored while calculating the well temperature profile. Therefore, in this study, we established a model to analyze the changing law of the temperature profile inside the production string of a high-pressure/high-temperature gas well (HPHT gas well). The proposed model considers the flow friction caused by a high production rate. Meanwhile, the variations in gas properties are taken into account to increase the model accuracy, including gas density, flow velocity, and viscosity. The analysis indicates that the temperature in the production string decreases more and more quickly from the reservoir to the wellhead. The wellhead temperature changes more and more slowly with time. When the reservoir temperature is too low to maintain production, it is useful to regulate the production rate or inject the thermal insulating fluid into the annulus to avoid the block caused by wax deposition or hydrate deposition. Considering the sensitivity, feasibility, and cost, it is recommended to change the well temperature profile by adjusting the production rate. If not applicable, the thermal conductivity can also be optimized to change the temperature profile.

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Section: Evaluation Of the Influencing Factorsmentioning

confidence: 99%

Sensitivity analysis of the temperature profile changing law in the production string of a high-pressure high-temperature gas well considering the coupling relation among the gas flow friction, gas properties, temperature, and pressure

Cao

Sun

Zhang³

et al. 2022

Front. Phys.

Self Cite

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show abstract

“…(2) Shallow fracture and pore throat characteristics: micropores and ultramicrofractures dominate, most pores are between 1 and 30 μm, rock pores are not uniform, most areas do not have chemical gaps, and a locally concentrated distribution. (3) The temperature and pressure characteristics of the shallow layer: the formation pressure equivalent is between 1.05 and 1.36 g/cm 3 , the safety density window is less than 0.3 g/cm 3 , and the temperature spans 0 to 60 °C. , The impact of shallow hydrate formation on drilling operations needs to be considered during the drilling process. (Hydrate control is not the focus of this paper, so it is not analyzed here.)…”

Section: Introductionmentioning

confidence: 99%

“…(3) The temperature and pressure characteristics of the shallow layer: the formation pressure equivalent is between 1.05 and 1.36 g/cm 3 , the safety density window is less than 0.3 g/cm 3 , and the temperature spans 0 to 60 °C. 11 , 12 The impact of shallow hydrate formation on drilling operations needs to be considered during the drilling process. (Hydrate control is not the focus of this paper, so it is not analyzed here.)…”

Section: Introductionmentioning

confidence: 99%

Properties of Bentonite Slurry Drilling Fluid in Shallow Formations of Deepwater Wells and the Optimization of Its Wellbore Strengthening Ability While Drilling

et al. 2022

ACS Omega

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Offshore oil- and gas-field development is shifting from shallow water to deepwater on a large scale. Deepwater shallow bentonite slurry drilling fluid has a single composition and a simple structure. Therefore, the bentonite slurry drilling fluid has been neglected for the shallow wellbore strengthening ability. Based on the shallow geological characteristics and bentonite hydration mechanism, considering the economy and application effect, the optimization of bentonite slurry drilling fluid from four aspects of viscosity enhancement, adsorption, trapping, and physical plugging to carry out deepwater shallow wellbore strengthening research has been undertaken. For an indoor simulation of bentonite slurry and its drilling slurry-making process using a 2–10% mass concentration of bentonite slurry drilling fluid, laser particle size analysis found an interesting phenomenon different from the traditional understanding: for every 5% increase in particle size accumulation in the range of 0.1–100 μm, the bentonite slurry particle size increases linearly. Based on this interesting phenomenon, the basic performance of drilling fluids with different concentrations of bentonite slurry was evaluated. Experiments were conducted to introduce cationic emulsified asphalt as a deformation filler and to explore a new inexpensive drilling and wellbore strengthening material, AEH-P. The effectiveness of deepwater shallow strengthening was evaluated for AEH-P and cationic emulsified asphalt from both mechanistic and experimental aspects. It is obvious that the wellbore strengthening effect is the result of both particle settling and particle size matching. By exploring the relationship among bentonite slurry hydration dispersion, the charged nature, particle concentration, and the wellbore strengthening effect, a set of low-cost deepwater shallow bentonite slurry drilling fluids with a good wellbore strengthening effect are constructed. The research results provide a method to strengthen the wellbore for the subsequent fast and efficient drilling of deepwater shallow wells, further improving the drilling efficiency.

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Comparison of Nitrogen Gas and Thermal-Insulation Liquid to Control the Temperature–Pressure Effect in Deep Gas Well

Zhang¹,

Cao²,

et al. 2023

Iran J Sci

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Impact of wellbore fluid properties on trapped annular pressure in deepwater wells

Cited by 17 publications

References 17 publications

Sensitivity analysis of the temperature profile changing law in the production string of a high-pressure high-temperature gas well considering the coupling relation among the gas flow friction, gas properties, temperature, and pressure

Sensitivity analysis of the temperature profile changing law in the production string of a high-pressure high-temperature gas well considering the coupling relation among the gas flow friction, gas properties, temperature, and pressure

Properties of Bentonite Slurry Drilling Fluid in Shallow Formations of Deepwater Wells and the Optimization of Its Wellbore Strengthening Ability While Drilling

Comparison of Nitrogen Gas and Thermal-Insulation Liquid to Control the Temperature–Pressure Effect in Deep Gas Well

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