Method for predicting drilling temperature of marine natural gas hydrate, storage medium and equipment

By establishing a pre-defined drilling temperature model that takes into account drill string friction, the wellbore temperature distribution during the drilling process of offshore natural gas hydrates is predicted, solving the prediction bias problem in existing technologies and ensuring the safety and efficiency of the drilling process.

CN116090271BActive Publication Date: 2026-07-14CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEMICAL CORP
Filing Date
2021-10-25
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

Existing technologies fail to effectively consider the impact of parameters such as drill string friction, circulation time, drilling fluid discharge rate, and horizontal section length on the wellbore temperature field during offshore natural gas hydrate drilling, resulting in discrepancies between predictions and actual operating conditions, which can easily lead to wellbore collapse and downhole accidents.

Method used

A pre-defined drilling temperature model based on the influence of drill string friction is established. By obtaining the well structure and thermodynamic parameters, the heat transfer models of the wellbore in the seawater section, vertical section and horizontal section are solved using the finite difference method to predict the wellbore temperature distribution, including the temperature models of the fluid inside the drill string, the drill string wall and the fluid in the annulus, taking into account the heat generated by the friction of the drill string movement and the pressure drop of the drilling fluid friction.

Benefits of technology

It enables more accurate wellbore temperature prediction, avoids deviations between predictions and actual operating conditions, ensures that hydrates in the formation around the well do not decompose, and improves the safety and efficiency of drilling operations.

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Abstract

The present application relates to the field of oil and gas development and exploration, and specifically provides a sea natural gas hydrate drilling temperature prediction method, a storage medium and equipment, which utilizes obtained wellbore structure parameters and thermodynamic parameters of sea natural gas hydrate reservoir horizontal well drilling circulation, and a preset drilling temperature model to predict wellbore temperature distribution during sea natural gas hydrate reservoir horizontal well drilling circulation. Since the preset drilling temperature model considers the influence of drill string friction on wellbore temperature during drilling, it can avoid deviation between prediction and practice conditions, establish a more real and accurate wellbore temperature profile of sea natural gas hydrate horizontal well drilling process, and ensure that hydrates in the surrounding formation will not decompose, which has great significance for safe and efficient drilling construction.
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