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Intelligent shaft pressure control method and device based on physical constraint

A technology for wellbore pressure and intelligent control, applied in the field of oil and gas well drilling, can solve the problems of unestablished constraint conditions, unanalyzed constraint parameters, poor wellbore pressure control stability and reliability, etc. Reduce drilling risks and achieve the effect of safe drilling

Pending Publication Date: 2022-07-12
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

[0005] This paper is used to solve the problem of poor stability and reliability of wellbore pressure control due to the lack of analysis of the constraint parameters related to the opening of the throttle valve in the MPD data and the establishment of constraint conditions when the existing artificial intelligence is applied to wellbore pressure control. question

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  • Intelligent shaft pressure control method and device based on physical constraint
  • Intelligent shaft pressure control method and device based on physical constraint
  • Intelligent shaft pressure control method and device based on physical constraint

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Embodiment Construction

[0082] The technical solutions in the embodiments herein will be clearly and completely described below with reference to the accompanying drawings in the embodiments herein. Obviously, the described embodiments are only a part of the embodiments herein, rather than all the embodiments. Based on the embodiments herein, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection herein.

[0083] It should be noted that the terms "first", "second" and the like in the description and claims herein and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It is to be understood that data so used may be interchanged under appropriate circumstances so that the embodiments herein described can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", and any var...

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Abstract

The invention provides a shaft pressure intelligent control method and device based on physical constraints. The method comprises the steps that pressure control drilling data of a drilled well is obtained; according to pressure control drilling data of a drilled well and input parameters of a throttle valve opening degree adjusting model, an input vector is constructed, the throttle valve opening degree adjusting model is trained through constraint conditions, a neural network and historical pressure control drilling data of a drilled reference well, and the constraint conditions are established according to the incidence relation between the constraint parameters and the throttle valve opening degree; inputting the input vector into a throttle valve opening adjustment model to obtain a predicted throttle valve opening; the predicted throttle valve opening degree is input into the bottom hole pressure calculation model, and the predicted and calculated bottom hole pressure is obtained; and judging whether the difference between the predicted and calculated bottom hole pressure and the target bottom hole pressure is within a preset range, if not, updating the input vector and returning to execute the prediction process, and if yes, adjusting the throttle valve according to the predicted throttle valve opening degree. According to the method, the stability and generalization ability of the throttle valve opening degree adjusting model can be effectively improved.

Description

technical field [0001] This paper relates to the technical field of oil and gas well drilling, in particular to a method and device for intelligent control of wellbore pressure based on physical constraints. Background technique [0002] With the deepening of oil and gas exploration and development, the focus of oil and gas exploration and development is developing to deep and ultra-deep layers. However, deep formations often have the characteristics of high temperature, high formation pressure, and narrow safety drilling fluid density window. If the drilling technology measures are not appropriate, complicated downhole conditions such as overflow and gas invasion are likely to occur. Therefore, the wellbore pressure is accurately controlled and slightly higher than Formation pressure is the key technology to achieve safe drilling in deep high temperature and high pressure formations. [0003] The traditional wellbore pressure control is realized based on algorithms such as...

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Application Information

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IPC IPC(8): E21B47/00E21B47/06E21B43/12G06N3/08
CPCE21B47/00E21B47/06E21B43/121G06N3/08
Inventor 祝兆鹏宋先知姚学喆李根生黄中伟段世明胡晓丽余簿文
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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