Propagation velocity and time laws of backpressure wave in the wellbore during managed pressure drilling

Yan, Tie; Qu, Junbo; Sun, Xiaofeng; Chen, Ye; Pan, Yi

doi:10.1016/j.ngib.2017.11.009

Cited by 6 publications

(1 citation statement)

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“…The wellbore pressure is managed when operating in high-pressure reservoirs, particularly those with gas intrusion, by altering the flow control valve's opening (Hu et al, 2017;Zhang et al, 2023). Back pressure is generated at the wellhead and acts on the whole wellbore, which can effectively slow or restrain gas intrusion and rebuild the wellbore pressure balance (Yan et al, 2018;Liao et al, 2020). The success of the kill depends on the analysis of wellbore pressure.…”

Section: Introductionmentioning

confidence: 99%

A new approach to analyzing wellbore pressure dynamically in well-killing

Liu

Wang

et al. 2023

Front. Earth Sci.

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Casing pressure during well-killing is both an unknown variable that must be addressed and a time-dependent function. Therefore, the calculation of the dynamic reaction of wellbore pressure during well-killing is a dynamic indeterminate boundary problem. Due to the intricacy of the analytical solution technique, finding an analytical solution for the dynamic issue of uncertain boundaries is nearly impossible. Current numerical simulation software is only capable of resolving problems with defined bounds (such as flow or pressure) and is incapable of continuously calculating the wellbore pressure, which varies dynamically with well-killing time. Developing a dynamic reaction computation method for wellbore pressure during well-killing can solve this issue. Based on the mathematical model and definite solution conditions of the wellbore pressure dynamic response under well-killing conditions, this paper applies the finite difference principle and constructs the calculation method of choke and kill wellbore pressure dynamic response through reasonable mesh division of wellbore and gradual iteration of the calculation process. The resultsdemonstrate that the maximum wellhead casing pressure value and the time node of peak value are both highly congruent with the measured data, indicating the method’s high reliability and highlighting its significance for the progress of oil and gas well control safety.

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