Deep ground stress measurement while drilling (MWD) system

A test system and stress test technology, which is applied in the directions of measurement, earthwork drilling, wellbore/well components, etc., can solve the problems of time-consuming and long time, and achieve the effect of high efficiency, simple operation and reliable data

Inactive Publication Date: 2010-11-24
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

In the deep hole above 1000m, it takes a very long time to complete a drilling, and it takes even more time when sampling drilling.

Method used

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  • Deep ground stress measurement while drilling (MWD) system
  • Deep ground stress measurement while drilling (MWD) system
  • Deep ground stress measurement while drilling (MWD) system

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0038] like figure 1 Shown is a system structure diagram of a deep ground stress while drilling testing system of the present invention, the system includes an induction testing unit, a data acquisition unit and a data analysis unit;

[0039] The induction test unit includes a stress sensor S1 for testing the ground stress in the borehole. Because the stress level in the earth's crust is closely related to the historical tectonic movement and geological conditions, the stress level is different in different geographical locations and different sounding depths. Therefore, the stress sensor will measure for different stress levels. In the present invention, the stress sensor is designed as two groups of synchronous stress testing units of high ground stress and low ground stress, and each group respectively measures the stress and strain at three equal ...

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Abstract

The invention belongs to the technical field of geological energy, minerals and geotechnical engineering investigation, and in particular relates to a deep ground stress measurement while drilling (MWD) technique, which can be used for testing ground stress in the earth crust in real time in geology and geotechnical engineering exploration. A deep ground stress MWD system comprises an induction test unit, a data acquisition unit and a data analysis unit. The system submerges at the bottom of a hole along with a drill, can measure the magnitude and direction of the three-dimensional ground stress, the temperature in the hole and the drilling trace at any sounding position in the drilling process, can overcome the defects of the conventional hydrofracturing method and the deep hole trepanning ground stress measurement technique, can perform measurement along with the drill in drilling production or exploration without specially drilling for measuring the ground stress, and can provide alarge amount of data for the initial ground stress field analysis of a project. The system has the advantages of no influence of ground magnetic field and temperature in the hole and vibration of a drilling tool, easy installation, simple operation, and high testing accuracy.

Description

technical field [0001] The invention belongs to the technical field of geological energy, mineral resources and geotechnical engineering exploration, and in particular relates to a deep geostress-while-drilling testing technology, which can be used for real-time testing of geostress in the earth's crust during geological and geotechnical engineering drilling. Background technique [0002] In-situ stress is the fundamental force that causes deformation and destruction of various underground and open-pit excavation projects and induces geological disasters. Preconditions for decision making. With the deepening of resource mining and geotechnical engineering, the depth and scale of human engineering activities will become larger and larger, and the ground stress will increase with the depth, and the impact on engineering construction and operation will be more prominent. Due to the irreversibility of recovery deformation damage, the ground stress should be fully measured befor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/00E21B47/06E21B47/02E21B49/00E21B47/07
Inventor 谭卓英刘文静任红岗
Owner UNIV OF SCI & TECH BEIJING
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