Wellbore temperature field numerical calculation method in thickening acid acidification process

Abstract

The invention relates to a wellbore temperature field numerical calculation method in a thickening acid acidification process. The wellbore temperature field numerical calculation method comprises thefollowing steps: (1) measuring apparent viscosity of a thickening acid sample at different temperatures and different shearing rates by using a rheometer, and establishing a thickening acid rheological model; (2) judging the flow state of the thickening acid under different injection conditions, and calculating the flowing shear rate of the thickening acid shaft under different flow states; (3) substituting the flowing shear rate of the thickening acid shaft into the rheological model to obtain the apparent viscosity of the acid liquid under different injection conditions, and calculating theconvective heat transfer coefficient of the thickening acid under different injection conditions; (4) establishing a thickening acid acidification wellbore temperature field numerical calculation model considering the rheological property influence of the acid liquid; and (5) calculating the temperature distribution of the acid liquid in the shaft under different injection conditions. According to the wellbore temperature field numerical calculation method, the influence of acid liquor rheological property on the shaft-stratum heat transfer efficiency in the acidification process is considered, and the temperature distribution of the acid liquor in the shaft is calculated by adopting a numerical method, and the wellbore temperature field numerical calculation method has guiding significance for acidification transformation design of the marine carbonate reservoir.

Description

technical field [0001] The invention relates to the field of petroleum engineering, in particular to a numerical calculation method for the wellbore temperature field considering the influence of acid fluid rheology during the thickening acid acidification process of deep carbonate rock reservoirs. The numerical calculation method is used to calculate the temperature change of the acid fluid flowing in the wellbore during the acidizing process, so as to improve the accuracy of acidizing design of deep carbonate reservoirs and realize high-efficiency acidizing stimulation of deep carbonate reservoirs. Background technique [0002] Deep marine carbonate formations are the main formations to realize the beneficial exploration and development of natural gas in the Sichuan Basin, and the reservoirs are characterized by deep burial (>5000m) and high temperature (>140°C) (Ma Xinhua, Yang Yu, Wenlong, Luo Bing. Distribution law and exploration direction of large and medium-siz...

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Problems solved by technology

[0004] At present, the commonly used wellbore temperature calculation method mainly focuses on the analysis of the heat transfer process between the wellbore and the formation (Zhang Z, Xiong Y M, Gao Y, et al. Wellbore temperature distribution during circulation stage when well-kick occurs in a continuous formation from the bottom-hole. Energy, 164(2018): 964-977, 2018), but neglected the influence of acid fluid rheology on the wellbore-formation heat transfer effect during the acidizing process

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