Observation instrument embedded blockage system for drilling hole high-pressure packer test

Abstract

The invention discloses an observation instrument embedded blockage system for a drilling hole high-pressure packer test. The system is provided for solving the problem of the failed observation as the observation instrument is easily cemented by sequent poured cement (mortar) serous liquid in the pouring process of the existing observation instrument for the drilling hole high-pressure packer test. The embedded blockage system comprises a test observation hole, a permeation prevention section arranged in the test observation hole and a sleeve penetrating through the permeation prevention section; the bottom and top of the sleeve are provided with a plug respectively; the observation instrument is arranged in the lower pipe of the sleeve and is connected with an external connected cable; a test cavity is formed among the sleeve, the bottom of the permeation prevention section and the inner wall of the bottom of the observation hole; the test cavity is communicated with the sleeve by a water passing hole; the permeation prevention section is formed by a cement paste plug, an expansion cement paste plugging section and a geotextile section which are sequentially arranged from the port to bottom of the test observation hole. The observation instrument embedded blockage system for the drilling hole high-pressure packer test is simple in structure and convenient to operate, and can effectively ensure the reliability of embedded blockage of the observation instrument.

Description

technical field [0001] The invention relates to an observation instrument embedding and sealing system for drilling high-pressure water pressure tests, which is mainly suitable for the observation instrument embedding and sealing of rock mass in-situ high-pressure water pressure test systems for underground projects in the fields of water conservancy and hydropower projects, oil reserves, etc. process flow. Background technique [0002] When the observation instrument of the existing high-pressure water pressure test in the borehole is buried and sealed, the modified cement (sand) slurry is mainly used for grouting and sealing or the mechanism of dry kelp is used for water expansion. The cement (sand) slurry sealing process The disadvantage is that during the grouting process, it is easy to cause the observation instrument to be glued together by the cement (sand) grout poured in later, causing the observation instrument to fail, and the construction quality is difficult to ...

AI Technical Summary

Problems solved by technology

[0002] When the observation instrument of the existing high-pressure water pressure test in the borehole is buried and sealed, the modified cement (sand) slurry is mainly used for grouting and sealing or the mechanism of dry kelp is used for water expansion. The cement (sand) slurry sealing process The disadvantage is that during the grouting process, it is easy to cause the observation instrument to be glued together by the cement (sand) grout poured in later, causing the observation instrument to fail, and the construction quality is difficult to guarantee

However, the sealing effect of dry kelp is difficult to guarantee. If the lashing radius of kelp is too large, the system resistance will be too large, and it will be difficult to place the instrument in place accurately. If there is water in the hole, the kelp may swell before the instrument is in place; Small size, unsatisfactory plugging effect, easy to mix pulp and leak water

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