Prediction Model of Equivalent Circulating Density of Drilling Fluid in Deep HPHT Wells and Its Application

doi:10.3969/j.issn.1006-6535.2022.03.020

Abstract

Abstract: Deep HPHT wells have the characteristics of complex wellbore temperature field changes and large changes in the physical properties of drilling fluids, multiplying the difficulties in accurate prediction of the equivalent circulating density (ECD) of drilling fluid. To this end, based on the drilling data of deep HPHT wells in a study area in the South China Sea, the characteristics of response between the equivalent static density and rheological parameters of deep water-based drilling fluids and the temperature and pressure were investigated by means of PVT meter and rotary viscometer. The parameters of empirical model were fitted based on experimental data, while the ECD calculation model of deep HPHT wells was improved with consideration of the influence of temperature and pressure on the physical parameters of drilling fluid and the influence of subsea pressurization on the flow field and temperature field of wellbore. The study showed that, the physical properties of the water-based drilling fluid were greatly affected by high temperature and pressure, and the higher the displacement of the subsea booster pump, the higher the ECD in the wellbore. The model was used in the calculation of Well ST362-1d well in the South China Sea, and the average error was only 0.249% between the predicted value of ECD model and the measured value. The results of the study can serve as references for the optimal design of hydraulic parameters and wellbore pressure control in deep HPHT wells.

Key words: equivalent circulating density, drilling fluid, deepwater drilling, high-temperature well, high-pressure well, South China Sea

CLC Number:

TE254

Gao Yongde, Dong Hongduo, Hu Yitao, Chen Pei, Cheng Leli. Prediction Model of Equivalent Circulating Density of Drilling Fluid in Deep HPHT Wells and Its Application[J]. Special Oil & Gas Reservoirs, 2022, 29(3): 138-143.

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