Device for measuring ground stress

Abstract

The invention relates to a device for measuring ground stress. An adjustment screw seat is arranged at the bottom of an experimental plate; a leveler, a laser emitter, an optical filter, a single slit, a double slit, a light-shielding cylinder, an optical screen and a micro-metering eyepiece are successively installed on the top of the experimental plate; the leveler checks whether the experimental plate is horizontal by internal bubbles; the laser emitter emits monochromatic light having a wavelength [lambda], and selects red light having a long wavelength; the single slit is configured to form a linear light source; and the micro-metering eyepiece is configured to measure the distance between bright stripes. The device is reasonable in design, simple in structure, easy to operate, easy to machine, easy to carry, low in cost, not only can accurately measure rock strain, but also can determine the magnitude of ground stress by using petrologic parameters, has important guidance significance to efficient oilfield development, and can be used in an oilfield core library because of good portability and good practicality.

Description

1. Technical field: [0001] The invention relates to a device for measuring geostress by using oil well cores and a method for using it, in particular to a device for measuring geostress. 2. Background technology: [0002] In the process of oil and gas exploration and development, the direction of the current in-situ stress field affects and controls the migration of oil, gas, and water in the oilfield development process. Through the study of the current in-situ stress, it can be used for the layout, adjustment and maintenance of injection-production well patterns in oilfield development. Development plan design provides scientific background information. It can be said that the study of in-situ stress field is closely connected with oil and gas exploration and development. It is one of the important links in the system engineering of oil and gas exploration and development in oil fields. Guiding significance. Therefore, it is of great significance to obtain the layered geo...

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Problems solved by technology

Among them, the sound velocity method is widely used to directly measure the core, but the core sound velocity test device can only be operated in the laboratory and is inconvenient to carry. Inhomogeneity of lithology, development of micro-fractures, bedding, etc. will lead to an increase in the measurement error of the sound velocity test; in addition, practice shows that the accuracy of the well deviation statistical method and the borehole caving method is limited, and in many cases there is no formation It is also difficult to orientate the position of wellbore collapse in dip logging. The accuracy of the fracturing data method is high, but many old wells in oilfields and certain intervals of oil wells lack such data, and the above methods cannot be based on the measured data. In-situ stress information draws the in-situ stress profile of the formation

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