Continuous conduit type coring equipment

Abstract

The invention relates to continuous conduit type coring equipment which comprises a coring device and a continuous conduit operation device. The coring device comprises an inner pipe assembly and an outer pipe assembly, and the inner pipe assembly can be connected with the outer pipe assembly in a clamping manner; the outer pipe assembly comprises an outer pipe and a drill bit arranged on the outer pipe, and the inner pipe assembly comprises an inner pipe component and a central rod; the inner pipe component comprises a core inner cylinder, a core outer cylinder and a pressure retaining valvearranged at the bottom of the core outer cylinder; and the continuous conduit operation device comprises a continuous conduit and a guiding and injecting integrated mechanism capable of pulling the continuous conduit down or out, wherein the continuous conduit is used for lowering and lifting the inner pipe assembly. The pressure maintaining coring device is lifted up and lowered by using the continuous conduit operation device, a cable can penetrate in the continuous conduit conveniently transmit measurement and control signals, and real-time measurement of hole bottom parameters is facilitated; the guiding and injecting integrated mechanism integrates a guiding function and an injecting function, a guide gooseneck can be omitted, and the height of the equipment can be effectively reduced; and the equipment is particularly suitable for operation environments with the limited space height.

Description

technical field [0001] The invention relates to the technical field of underground exploration, in particular to a continuous conduit type coring equipment. Background technique [0002] my country is not only a big coal producer, but also a big coal consumer. Coal is an important basic energy and raw material for our country. Coal seam gas content and coal seam gas pressure are the main indicators of outburst coal seam outburst risk area prediction and regional effect inspection. Coal seam gas content is usually measured by ground coal seam gas content measurement, geological survey gas content measurement, coal seam drilling and coring in underground mines, etc. Due to the differences in the test conditions and methods of coal seam gas content, the test results of the above coal seam gas content often have large differences and low accuracy, and there are widespread estimation losses, which have limited guiding significance for coal mining. [0003] For coal seam tunnel c...

AI Technical Summary

Problems solved by technology

The inlet of the existing coiled tubing injection head is located directly above the outlet, and the injection head itself has a certain height, coupled with the height of the guide gooseneck, resulting in a high height of the entire equipment, which is not suitable for the working environment with limited space height ( For example, coal mine roadway, the general height does not exceed 3m)

[0005] In addition, in order to further realize pressure-holding coring of coal seams, a patent document with a publication number of CN201811862U discloses an underground pressure-relief sealed coal core sampler, which relies on mucus and vacuum devices to perform pressure-holding coring of samples. There is a fluid medium in the coal seam, which will cause certain pollution to the coal seam core and affect the determination of parameters such as water content

[0006] The coring device is usually composed of an inner tube assembly and an outer tube assembly. There is a gap between the inner tube assembly and the outer tube assembly, so that the coring cylinder is easy to rotate with the coring outer cylinder. When the external disturbance is large, There may be a large error between the coring composition and the real situation

In order to reduce the error caused by rotation, currently used coring devices are often provided with a single-action device between the outer tube assembly and the inner tube assembly to reduce the rotation of the core cylinder, but although the single-action device has anti-rotation effect, it cannot The anti-rotation effect is limited, and it is difficult to effectively reduce the measurement error

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