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Aquifer water outlet section positioning system and method adopting distributed acoustic sensing equipment

An acoustic sensing and positioning system technology, which is applied to earth-moving drilling, clockwork mechanism, hoisting device, etc., can solve the problems of poor accuracy, inconsistent test results, difficult to target curtain grouting, etc. The effect of pulp cost, simple and convenient operation, and low test cost

Pending Publication Date: 2022-05-13
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The salinization logging method needs to put a large amount of table salt into the hole, and start work after it is fully melted. When the test section is long, the test results are often inconsistent with the actual situation due to uneven injection, and the accuracy is relatively poor.
[0007] Based on the above analysis, it can be seen that the existing methods for dividing the water outlet section of the aquifer cannot finely divide the extremely thick sandstone aquifer on the roof, and cannot realize the precise positioning of the water outlet section of the extremely thick roof sandstone aquifer, which leads to blindness in the selection of the roof curtain grouting layer. Large, difficult to target curtain grouting

Method used

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  • Aquifer water outlet section positioning system and method adopting distributed acoustic sensing equipment
  • Aquifer water outlet section positioning system and method adopting distributed acoustic sensing equipment
  • Aquifer water outlet section positioning system and method adopting distributed acoustic sensing equipment

Examples

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Comparison scheme
Effect test

Embodiment 1

[0065] This embodiment provides a positioning system for the outlet section of an aquifer using distributed acoustic sensing equipment, such as Figure 1 to Figure 3 As shown, it includes a logging winch 1, which is arranged on the ground outside the hydrogeological exploration borehole 9, and the hydrogeological exploration drilling hole 9 is arranged in the thick sandstone of the roof; it also includes a fixed pulley 2, and the fixed pulley 2 is set At the top of the hydrogeological exploration borehole 9;

[0066] One end of the single-mode well logging steel wire optical fiber 3 is arranged on the well logging drawworks 1, and the other end of the single-mode well logging steel wire optical fiber 3 bypasses the fixed pulley 2 and extends into the hydrogeological exploration borehole 9; the single-mode well logging steel wire optical fiber 3 is connected in sequence from left to right with display screen 4, measurement and control and signal processing equipment 5, distribu...

Embodiment 2

[0081] This embodiment provides a method for locating a water outlet section of an aquifer using a distributed acoustic sensing device. The method uses the location system for an outlet section of an aquifer using a distributed acoustic sensing device in Embodiment 1. The method specifically includes the following steps :

[0082] Step 1, assemble the system;

[0083] Connect the display screen 4, the measurement and control and signal processing equipment 5, the distributed acoustic sensing equipment 6 and the borehole depth recorder 7 in sequence; install the single-mode well logging steel wire optical fiber 3 on the well logging drawworks 1, and record the borehole depth After the recorder 7 and the optical fiber counterweight 8 are connected to the single-mode logging steel wire optical fiber 3, the end of the single-mode well logging steel wire optical fiber 3 connected with the optical fiber counterweight 8 bypasses the fixed pulley 2 at the hole, and acts on the optical...

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Abstract

The invention provides an aquifer water outlet section positioning system and method adopting distributed acoustic sensing equipment. The system comprises a logging winch and a fixed pulley. One end of a single-mode logging steel wire optical fiber is arranged on the logging winch, and the other end of the single-mode logging steel wire optical fiber bypasses the fixed pulley and extends into the hydrogeological exploration drill hole; the single-mode logging steel wire optical fiber is sequentially connected with a display screen, measurement and control and signal processing equipment, distributed acoustic sensing equipment, a drilling depth recorder and an optical fiber balance weight from left to right. According to the method, a single-mode logging steel wire optical fiber is adopted as a sensor, a distributed acoustic sensing device is adopted to inject an enhanced linear sweep frequency optical pulse into the single-mode logging steel wire optical fiber, and a measurement and control and signal processing device is adopted to process a backward Rayleigh scattering signal fed back after transmission in the single-mode logging steel wire optical fiber. And a differential phase signal is obtained, so that the accurate positioning of the water outlet section of the top plate ultra-thick sandstone aquifer can be realized.

Description

technical field [0001] The invention belongs to the technical field of hydrogeological exploration, and relates to a positioning system and method for a water outlet section of an aquifer, in particular to a positioning system and a method for a water outlet section of an aquifer using distributed acoustic sensing equipment. Background technique [0002] The commonly used hydrogeological exploration techniques in the outlet section of the aquifer mainly include drilling core recording method, segmental pumping test method, flow logging method and salinization logging method. [0003] Drilling core recording method is mainly to carry out geological recording of rock formations through cores taken in the drilling process and geophysical logging methods; for extremely thick sandstone aquifers, it is to generally divide various sandstone layers into aquifers, and divide Mudstone and sandy mudstone layers are divided into water-resisting layers. The drilling core recording metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/00E21B47/04B66D1/74
CPCE21B47/00E21B47/04B66D1/74Y02A90/30
Inventor 朱开鹏宁殿艳刘英锋王世东郭小铭马荷雯
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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