Determination of transient temperature distribution inside a wellbore considering drill string assembly and casing program

Abstract

Heat exchange efficiency between each region of the wellbore and formation systems is influenced by the high thermal conductivity of the drill string and casing, which further affects temperature distribution of the wellbore. Based on the energy conservation principle, the Modified Raymond), Simplified and Full-scale models were developed, which were solved by the fully implicit finite difference method. The results indicated that wellbore and formation temperatures were significantly influenced at the connection points between the drill collar and drill pipe, as well as the casing shoe. Apart from the near surface, little change was observed in temperature distribution in the cement section. In the open-hole section, the temperature rapidly decreased in the circulation stage and gradually increased in the shut-in stage. Most important, the simulated result from the full-scale model coincided with the measured field data better than the other numerical models. These findings not only confirm the effect of the drill string assembly and casing programs on the wellbore and formation temperature distribution, but also contribute to resource exploration, drilling safety and reduced drilling costs.

Study on Wellbore Temperature and Pressure Distribution in Process of Gas Hydrate Mined by Polymer Additive CO2 Jet

“…Since 1950s, drilling workers have begun to study the temperature distribution of wellbore by numerical simulation and analytical method [15]. e earliest wellbore temperature study was conducted by Ramey, who proposed a steady-state model for obtaining wellbore temperature distribution, which could not be applied to transient behavior [16][17][18][19]. Raymond proposed a numerical model for wellbore temperature distribution under pseudo-steady-state conditions [20].…”

Transient Temperature Distribution of Underground Carbon Dioxide Salt Cavern Storage With State Space Model

“…The earliest study of wellbore temperature was by Ramey. He drew charts for predicting bottom-hole circulating temperatures (Ramey, 1962;Wei et al, 2020) and proposed a steadystate model for obtaining the hole wellbore temperature distribution, which could not be applied to transient behavior (Hasan and Kabir, 2002;Yang et al, 2017;Wei et al, 2020). Raymond proposed the first numerical model for predicting temperature distributions for both transient and pseudo-steadystate conditions (Raymond, 1969).…”

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

“…This modeling approach depends on many common elements, such as temperature profiles surrounding the wellbore and any series of resistances for the various elements in the wellbore. Based on the energy conservation principle and the Modified Raymond, Yang M et al [5] developed simplified and full-scale models, and the results indicated that wellbore and formation temperatures were significantly influenced at the connection points between the drill collar and drill pipe, as well as the casing shoe. Jia HJ, Meng YF, Li G, Su G, et al [6] established the thermal conductivity model of liquid-filled annulus, and the influence of casing annulus fluid on temperature distribution was simulated numerically.…”