A wellbore pressure control method and system

Abstract

The invention discloses a wellbore pressure regulation method and system. The method includes: adopting a three-layer feedback control method to adjust the opening of the throttle valve of the pressure control system to realize the regulation of the output pressure, wherein the The three-layer feedback control method includes: the inner layer realizes the feedback control of the throttle valve opening; the middle layer realizes the opening degree control based on the characteristic curve of the throttle valve; the outer layer realizes the cascade control from the bottom back pressure to the well head back pressure. The wellbore pressure control method of the present invention adopts the wellbore pressure three-layer feedback control method, and compared with the prior art, the control precision is high and the response speed is fast.

Description

technical field [0001] The invention relates to the field of geological exploration, in particular to a wellbore pressure control method and system. Background technique [0002] With the rapid development of the petroleum industry, the actual exploration and development have higher and higher requirements for various drilling technologies. Drilling technology has begun to develop towards automation and intelligence. A large number of new automated and intelligent drilling technologies have emerged and are widely used in various job sites. Controlled pressure drilling technology is an aspect of automated drilling, which is used to automatically monitor the bottom hole pressure. [0003] The goal of controlled pressure drilling is to precisely control the bottom hole pressure and keep the bottom hole pressure within the safe density window. However, at present, there are the following problems in wellbore pressure control: (1) Some wellbore parameters cannot be obtained in ...

AI Technical Summary

Problems solved by technology

However, at present, there are the following problems in wellbore pressure control: (1) Some wellbore parameters cannot be obtained in real time (adjusting density, temperature distribution, etc.), resulting in inaccurate calculation of bottomhole pressure; the data transmission efficiency of measurement while drilling (PWD) is not high, and Continuous acquisition cannot be guaranteed under all operating conditions

(2) The traditional bottomhole pressure control method is a direct control method, which directly regulates the wellhead pressure according to the calculated bottomhole pressure, and less considers the influence of wellbore factors and back pressure on the wellbore, and the effect is poor; the control model based on the wellbore is abnormal Complex, it is difficult to establish an accurate control model in practice, even if the control model is barely established, the application effect is not good

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