Deep drilling complex environment local wall face stress relieving method testing system

Abstract

The invention belongs to the technical field of rock and soil mechanics measurement, and particularly discloses a deep drilling complex environment local wall face stress relieving method testing system. The system comprises an electronic control acquisition subsystem, a pushing and positioning mechanism, a stress relief and strain measurement subsystem and a hydraulic balance subsystem which are connected in sequence, the electronic control acquisition subsystem is connected with a ground controller through communication transmission equipment, the pushing and positioning mechanism is expanded in the radial direction of a center shaft of a drill hole to form a fulcrum and in contact with a well wall, the stress relief and strain measurement subsystem is used for collecting and obtaining strain data of the well wall of a drilling well in the stress relief process, and the hydraulic balance subsystem is used for balancing the internal space of the whole system and the pressure intensity in the drilling well. According to the system, accurately controlling and testing can be carried out on a local wall face with the depth of 3000 meters or above on the ground, automatic control and real-time transmission of test data in a deep drilling complex environment are realized, collapse danger of the drilling well is not easily caused, and the system has the characteristics of simplicity in operation, effectiveness, stability, convenience in maintenance and the like.

Description

technical field [0001] The invention belongs to the technical field of rock and soil mechanics measurement, and more specifically relates to a test system for local wall stress relief in a deep borehole complex environment. Background technique [0002] Unlike man-made materials such as concrete or rebar, natural materials such as rock and soil are subject to natural stresses. The stress of rock can be roughly divided into two categories. The first category is in-situ stress, which can be further subdivided into gravity stress, tectonic stress, residual stress and geodetic stress. The second category is the ground stress disturbance caused by human activities, such as mining, excavation, drilling, water pumping (oil) and so on. In all engineering fields dealing with rocks, it is very important to know the state of stress in the ground. [0003] However, at present, the in-situ stress measurement technology has problems such as insufficient test depth, unstable test results...

AI Technical Summary

Problems solved by technology

However, when testing in the deeper part of the borehole, the isolation and drainage of the hole wall section will lead to the collapse of the hole wall, which will cause the equipment to be buried in the hole, causing inestimable and huge losses

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