Device for measuring three-dimensional ground stress of deep rock

Abstract

The invention discloses a device for measuring three-dimensional ground stress of deep rock. A main detection part comprises an annular groove cutting device, a rock surface grinding device, a gluingand strain gage stripping device and a strain gage pasting device, all the parts are connected to a mobile rack and a sealing assembly through screws, and a turning device is located above an inner sealing sleeve and fixed on an upper end sleeve through screws; an air heater and a main power motor are located above the inner sealing sleeve and fixed on an upper machine base plate through screws; the strain gage pasting device is distributed in a thin wall coring bit of the annular groove cutting device; a longitudinal movement mechanism is located at the bottom of the main detection part and fixed on the lower end through screws; the inner sealing sleeve is connected with a lower machine base plate through a longitudinal connection plate and a longitudinal connection rod; the lower machinebase plate is connected with a longitudinal movement push rod base through a longitudinal connection sleeve; the longitudinal movement push rod base is connected with the longitudinal movement mechanism through a longitudinal movement push rod sleeve. The device is simple in structure, higher in compressive strength and suitable for conditions of deeper drilling tests and has a better waterproofeffect, and the testing precision is improved.

Description

technical field [0001] The invention belongs to the technical field of on-site measurement of rock and soil mechanics, and more specifically relates to a device for measuring three-dimensional ground stress of deep rock mass, which is suitable for the test environment of deep vertical drilling, especially drilling for shale gas exploration. Background technique [0002] Under the action of various factors such as rock and soil self-weight and tectonic action, the rock mass itself has internal stress, and its size and direction distribution is very complicated and varies from place to place. From the current research point of view, the distribution characteristics of in-situ stress have a profound impact on water conservancy, mining, oil and gas extraction, transportation engineering and other fields, and have been regarded as an important part of basic data in design and construction work. With more and more attention paid to unconventional oil and gas resources such as shal...

AI Technical Summary

Problems solved by technology

[0004] 1. The diameter of shale gas exploration holes is generally less than 150mm, and the current arrangement of various components cannot meet the requirements of further reducing the diameter;

[0005] 2. Due to the existence of drilling fluid in deep vertical drilling, the water head pressure is very high

It is difficult to meet the pressure resistance requirements with the current single-layer jacket, and if water enters, the internal electronic components will be severely damaged, making the instrument unable to operate normally;

[0006] 3. At present, the main working section of the instrument is too long, and the sealing and drainage capacity in the hole is limited, which increases the risk of hole wall instability. It is necessary to further reduce the longitudinal dimension

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