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Formation Pressure Monitoring While Drilling Method and Monitoring Device

A formation pressure and monitoring device technology, which is applied in the field of oil drilling exploration and development, and monitoring formation pressure, can solve the problems of reduced drilling efficiency, impact on drilling safety, inaccurate judgment of overpressured formations, etc., so as to improve safety and reduce drilling accidents Effect

Active Publication Date: 2018-02-06
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the dc index is jointly affected by engineering construction parameters such as drilling speed, drilling pressure, and drill bit size, which makes the judgment of overpressured formations inaccurate, and cannot provide timely and accurate early warning information for drilling countermeasures in overpressured formations, resulting in drilling efficiency. reduce and affect the safety of drilling

Method used

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  • Formation Pressure Monitoring While Drilling Method and Monitoring Device
  • Formation Pressure Monitoring While Drilling Method and Monitoring Device
  • Formation Pressure Monitoring While Drilling Method and Monitoring Device

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Embodiment Construction

[0025] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0026] Such as figure 1 Shown, the monitoring method while drilling formation pressure of the present invention comprises:

[0027] Step 100: In the early stage of the drilling process, the drilling system works in an overbalanced drilling mode.

[0028] Wherein, the overbalanced drilling method is that the wellbore mud pressure coefficient is greater than the formation pore pressure coefficient, and the wellbore mud pressure coefficient is the pressure ratio of the pressure generated by the mud liquid column to the water at the same depth. Among them, the wellbore mud pressure can be changed by adjusting the wellbore mud density.

[0029] In the initial stag...

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Abstract

The invention discloses a while-drilling monitoring method and device for formation pressure. The monitoring method includes the steps that the change of drilling parameters in the drilling process is monitored, whether drilling operation is conducted on an over-pressure packing layer or not is judged, and if yes, a drilling system gives out warning information, or else drilling operation continues being conducted. The change of the drilling parameters in the drilling process is monitored, the warning information is given out before drilling operation is conducted on the over-pressure packing layer, the mud density of a shaft can be automatically or manually adjusted in time, potential hazards of well kick, blowout and the like which are probably caused are eliminated through an effective well control method, and drilling accidents are reduced.

Description

technical field [0001] The present invention relates to a method and device for monitoring formation pressure in oil drilling exploration and development, in particular to a method and device for monitoring formation pressure while drilling based on the "fluid expansion" mechanism and wellbore environmental constraints. Background technique [0002] With the deepening of oil and gas exploration and development, overpressure is common in the drilling formations in the Xihu sag, and complex downhole accidents often occur during drilling. During the drilling process, when the wellbore mud pressure coefficient in the wellbore (the ratio of the pressure generated by the mud liquid column to the pressure of water at the same depth) is less than the formation pore pressure coefficient, the formation fluid enters the wellbore, and it can be divided according to the severity of the entry. For invasion, kick and blowout, affecting the safety of drilling engineering and drilling effici...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B44/00
CPCE21B44/00E21B47/06
Inventor 张国华王建平鲁法伟张书平刘金水李宁孙鹏侯志强刘云
Owner CHINA NAT OFFSHORE OIL CORP
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