Core barrel and coring drilling tool

Abstract

The invention discloses a core barrel which comprises a barrel body, a distance measuring unit and a control unit, after an underground core is drilled, the core enters a core bin, when the core reaches the distance measuring unit, distance measuring elements can measure and record the distance between the distance measuring elements and the surface of the core, and a plurality of distance measuring elements in a distance measuring assembly are circumferentially arranged around the axis of the barrel body; each distance measuring assembly can obtain the distance between the rock core in the circumferential direction and the distance measuring element, a contour diagram of the radial section of the rock core can be drawn according to data, and the radial section contour of the rock core is gradually obtained through the distance measuring unit as the rock core gradually enters the rock core bin of the pipe body. The time is used as a scale, rock core radial section profile diagrams at different times are drawn according to measurement data, the multiple sets of distance measurement assemblies can obtain multiple sets of measurement data, and therefore effective data are provided for ground stress measurement. The invention further provides a coring drilling tool which comprises the core barrel, and the core drilling and extracting time is fully utilized for measurement.

Description

technical field [0001] The invention relates to the technical field of core drilling equipment and its surrounding supporting facilities, in particular to a core pipe and a core drilling tool. Background technique [0002] Whether it is oil and gas resource exploration or earth science research, in-situ stress measurement is very necessary. In addition, in-situ stress measurement can also help analyze the complex conditions in deep wells and ultra-deep wells, and can improve the stability of the wellbore in a targeted manner. The measurement methods of in-situ stress are divided into direct measurement method and indirect measurement method. ASR method is a method of indirect measurement of in-situ stress, which has developed rapidly in recent years. ASR method is mostly used for in-situ stress measurement of deep wells, especially scientific drilling wells. For example, KTB in Germany, Wenchuan scientific drilling wells in my country, and continental scientific drilling we...

AI Technical Summary

Problems solved by technology

[0006] The above methods measure the deformation of the borehole wall while drilling, but not the deformation of the core to measure the in-situ stress. The measurement principles are different, and the data cannot be used for the ASR method to measure the in-situ stress.

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