Study on wellbore temperature of riserless mud recovery system by CFD approach and numerical calculation

Li, Xin; Zhang, Jie; Xu, Tianhan; Mao, Gezhen; Wang, Peigang

doi:10.1016/j.petlm.2019.06.006

Cited by 20 publications

(9 citation statements)

References 2 publications

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“…The prediction of wellbore temperature and pressure field has always been a major problem of common concern to scientists [1] because it is related to the accurate construction of oil production technology [2,3], the safety of pipe string [4][5][6], the normal use of various downhole tools [7], the reliability of production process [8], and the wax and scale prevention of oil and gas wells affected by temperature and pressure [9][10][11][12]. Nowadays, in the daily production process of gas wells, the phase change of natural gas in the wellbore is becoming more and more common [13,14].…”

Section: Research Status Of Gas-liquid Two-phase Wellmentioning

confidence: 99%

Study on Downhole Throttling Characteristics of High Water Content Gas

Zheng

Dou

et al. 2022

Geofluids

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In order not to hinder gas production, we usually hope that the bottom hole effusion can be discharged to the surface with high-pressure natural gas. For the production data of high water content gas wells, the problems of insufficient water content and liquid-carrying capacity affecting gas well production should be considered. Based on the wellbore gas-liquid two-phase pipe flow theory and heat transfer theory, the temperature and pressure coupling prediction model of a high water-bearing gas well is established. Combined with the downhole throttling mechanism and gas-liquid two-phase homogeneous flow theory, the temperature and pressure field distribution model is established. The results show that compared with the Ramey model and Hassan and Kabir model, the temperature and pressure coupling prediction model of high water-bearing gas wells established in this study has the smallest coefficient of variation in the four groups of data tests. Based on this, the effects of different working conditions and choke diameter on downhole throttling characteristics of high water-bearing gas wells are analyzed. The findings of this study are helpful to better predict the wellbore temperature and pressure coupling of high water-bearing gas wells and provide more effective help for the smooth production of gas wells.

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Section: Research Status Of Gas-liquid Two-phase Wellmentioning

confidence: 99%

Study on Downhole Throttling Characteristics of High Water Content Gas

Zheng

Dou

et al. 2022

Geofluids

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“…These areas (S 0 6 , S 6 12 , S 12 18 , S 18 24 , S 24 30 , S 30 36 ) can be calculated as the areas of the corresponding trapezoids [4,23]. The values of the trapezoid areas (which characterize the density stratification of the drilling fluid along the depth TECHNOLOGY AUDIT AND PRODUCTION RESERVES -№ 5/2(61), 2021…”

Section: Tablementioning

confidence: 99%

Development of a method for maintaining the performance of drilling fluids during transportation by Platform Supply Vessel

Maryanov

2021

TAPR

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The object of research is the process of transportation of drilling fluid used for lubrication and cooling of drilling equipment of offshore oil production platforms. The subject of the study is the stratification of the density of the drilling fluid along the height of the cargo tank in which it is transported. The technology of transportation of drilling fluid on the Platform Supply Vessel is considered. A problematic point in ensuring this process is that during the transportation of drilling fluids, due to the action of gravitational forces on organic and inorganic compounds in their volume, there is a latent change in their dispersion over the volume of the fluid. This leads to the stratification and stratification of the fluid density along the height, as well as to the formation of sediments at the bottom of the cargo tanks, in which the drilling fluid is transported. The study is aimed at developing a technology that maintains a constant value of the density of the drilling fluid along the depth of the tank in which it is transported. The studies were carried out in the vessel system for transporting drilling fluid of a specialized marine vessel of the Platform Supply Vessel type with a deadweight of 5850 tons. It is experimentally established that for a transportation time of 6–36 hours, the density stratification of the drilling fluid is 3.04–32.04 %. As a method that ensures the minimum stratification of the density of the drilling fluid during its transportation, it is proposed to use an additional X-shaped circulation of the drilling fluid in the volume of adjacent cargo tanks. Studies have confirmed that the density stratification over a time period of 6–36 hours decreases to a range of 2.30–9.01 %. The complex use of additional X-shaped circulation and simultaneous air supply to the bottom of the cargo tank provides a density stratification value of 0.73–2.93 %. The proposed technology was tested on a specialized seagoing vessel of the Platform Supply Vessel type with a deadweight of 5850 tons and can be used on offshore vessels that ensure the operation of offshore oil production platforms.

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“…The limit water depth of riser used in offshore drilling engineering is 3,047m [1][2][3]. However, due to the impact force of seawater, the riser will vibrate at different frequencies, which makes it impossible for the riser to be used ideally in a deepwater environment [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Untitled

2024

PPEJ

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The precise control of the annular pressure involves drilling safety and drilling cost, which have always been the focus of drilling engineering. In this paper, combined with the characteristics of the Riserless Mud Recovery (RMR) System, the calculation method of equivalent circulating density (ECD) and annulus pressure of the RMR system is proposed. According to the characteristics of the heat exchange of the RMR system, a mathematical model of the thermal field in the annular is established. The variation law of thermal field in the annular of some well sections was simulated by computational fluid dynamics (CFD) software. Comparing the CFD analysis results with the calculation results of mathematical models, the feasibility of the mathematical model is verified, and the temperature variation curve in the annulus is obtained. Based on the drilling data of a vertical well in the South China Sea, this paper analyzes the effects of seawater depth, equivalent static density (ESD) of drilling fluid, cuttings concentration, and discharge capacity on the annular pressure and ECD of the RMR system.

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Study on wellbore temperature of riserless mud recovery system by CFD approach and numerical calculation

Cited by 20 publications

References 2 publications

Study on Downhole Throttling Characteristics of High Water Content Gas

Study on Downhole Throttling Characteristics of High Water Content Gas

Development of a method for maintaining the performance of drilling fluids during transportation by Platform Supply Vessel

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