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CN-224228660-U - Device for measuring distribution depth and water pressure of multilayer pressure-bearing water layer

CN224228660UCN 224228660 UCN224228660 UCN 224228660UCN-224228660-U

Abstract

The utility model belongs to the field of multi-layer pressure-bearing water layer investigation in hydroelectric engineering, and particularly relates to a device for measuring the distribution depth and water pressure of a multi-layer pressure-bearing water layer. The utility model adopts the design thought of 'drilling through a layer, isolating a layer and measuring a layer', and utilizes the data measured by an aquifer interface detection sensor and the outer end drainage condition of an axial through hole of a drill rod to determine the positions of a bearing water layer top interface and a bearing water layer bottom interface, wherein the measured drilling depths S1 and S2 respectively correspond to the depth of the bearing water layer top interface and the depth of the bearing water layer bottom interface. When the water pressures P1 and P2 of the pressure-bearing water layer are measured, the drilling holes are sealed in advance through the first annular air bag and the second annular air bag, a sealed measuring environment can be provided for the water pressure measuring sensor, and the accuracy of measuring results is fully ensured. The utility model can simultaneously realize the measurement while drilling of the distribution depth of the multilayer pressure-bearing water layer and the water pressure, has accurate measurement results and has important significance for the construction of hydropower stations.

Inventors

  • CHEN WEIDONG
  • QU HAIZHU
  • HU SHUAI
  • LI ZHONGSHUANG
  • JIA ZHIYUAN

Assignees

  • 中国电建集团成都勘测设计研究院有限公司

Dates

Publication Date
20260512
Application Date
20250630

Claims (6)

  1. 1. The device for measuring the distribution depth and the water pressure of the multilayer confined water layer comprises a drill bit (1), a drill rod (6) and a ground monitoring system (7), wherein the drill bit (1) and the drill rod (6) are coaxially and fixedly connected together, and the device is characterized by comprising an air pump (8), an aquifer interface detection sensor (2) is fixedly arranged on the outer peripheral surface of the drill rod (6) at the position close to the drill bit (1), the aquifer interface detection sensor (2) at least comprises a lateral resistivity sensor (21) and a natural potential sensor (22), a first annular air bag (3), a water pressure measurement sensor (4) and a second annular air bag (5) are fixedly arranged on the outer peripheral surface of the drill rod (6) at one side, far away from the drill bit (1), of the aquifer interface detection sensor (2), the first annular air bag (3), the water pressure measurement sensor (4) and the second annular air bag (5) are sequentially arranged along the axial direction of the drill rod (6), the first annular air bag (3) is closest to the aquifer interface detection sensor (2), the first annular air bag (3), the second annular air bag (6) and the second annular air bag (5) are coaxially arranged at one side, and are respectively connected with the air pump (8) through air pipes, the first annular air bag (3) is provided with a first state capable of sealing a drilling hole when being inflated and a second state without sealing the drilling hole when being deflated, the second annular air bag (5) is provided with a first state capable of sealing the drilling hole when being inflated and a second state without sealing the drilling hole when being deflated, the aquifer interface detection sensor (2) and the water pressure measurement sensor (4) are respectively and electrically connected with the ground monitoring system (7) through wires (10), the drill rod (6) is provided with a drill rod axial through hole (61), and the drill rod axial through hole (61) is communicated with the outer surface of the drill bit (1) through a connecting hole.
  2. 2. The device for measuring the distribution depth and the water pressure of the multilayer pressure-bearing water layer according to claim 1, wherein the drill rod (6) is composed of a plurality of drill rod units which are coaxially and fixedly connected, a closed connecting structure is formed between the side walls of two adjacent drill rod units, the air charging and discharging pipeline (9) is connected through a pipeline joint at the area corresponding to the connecting part of the two adjacent drill rod units, and the conducting wire (10) is connected through a line joint at the area corresponding to the connecting part of the two adjacent drill rod units.
  3. 3. The device for measuring the distribution depth and the water pressure of the multilayer pressure-bearing water layer according to claim 1, wherein a gas pipe layout pipe (11) for laying a gas charging and discharging pipeline (9) and a wire layout pipe (12) for laying a wire (10) are fixedly arranged on the side wall of the axial through hole (61) of the drill rod.
  4. 4. The device for measuring the distribution depth and the water pressure of the multilayer pressure-bearing water layer according to claim 1, wherein the water pressure measuring sensor (4) is provided with a plurality of water pressure measuring sensors (4) which are arranged in an annular array around the axis of the drill rod (6) and are positioned on the same vertical distribution line on the outer peripheral surface of the drill rod (6) on the same measuring line which is independently arranged.
  5. 5. The device for measuring the distribution depth and the water pressure of the multilayer confined water layer according to any one of claims 1 to 4, wherein the aquifer interface detection sensor (2) further comprises a temperature sensor (23).
  6. 6. The device for measuring the distribution depth and the water pressure of the multilayer pressure-bearing water layer according to claim 5, wherein the lateral resistivity sensor (21) is provided with a plurality of lateral resistivity sensors which are arranged in an annular array around the axis of the drill rod (6), the plurality of lateral resistivity sensors (21) which are positioned on the same vertical distribution line on the outer peripheral surface of the drill rod (6) are positioned on the same independently arranged measuring line, the natural potential sensor (22) is provided with a plurality of natural potential sensors which are arranged in an annular array around the axis of the drill rod (6), the plurality of natural potential sensors (22) which are positioned on the same vertical distribution line on the outer peripheral surface of the drill rod (6) are positioned on the same independently arranged measuring line, the temperature sensor (23) is provided with a plurality of temperature sensors which are arranged in an annular array around the axis of the drill rod (6), and the plurality of temperature sensors (23) which are positioned on the same vertical distribution line on the outer peripheral surface of the drill rod (6) are positioned on the same independently arranged measuring line.

Description

Device for measuring distribution depth and water pressure of multilayer pressure-bearing water layer Technical Field The utility model belongs to the field of investigation of a plurality of pressure-bearing water layers in water and electricity engineering, and particularly relates to a device for measuring distribution depth and water pressure of the plurality of pressure-bearing water layers. Background Some complex stratum contains multiple bearing water layers, and the distribution of the bearing water layers has great influence on dam site selection, reservoir area seepage, dam seepage prevention and the like of the hydropower engineering. The distribution depth and the water pressure of the multilayer pressure-bearing water layer are difficult points for measuring the underground water. The prior art mainly comprises a drilling stopping layered logging method, a multi-stage monitoring well method, a geophysical prospecting method and the like for the layered pressure-bearing water level measuring method. The method mainly isolates the target interval by a down-loading packer system, when drilling through a plurality of aquifers, the method needs to be put into a casing pipe and cemented well cementation, and the pressure-bearing water head is measured by injecting/pumping water into the target interval, and has the defects of low efficiency, high cost and incapability of real-time measurement while drilling. The multistage monitoring well method is characterized by that several independent sieve tubes are parallelly mounted in the same drilling hole, every sieve tube corresponds to an aquifer, and can be respectively measured by means of wellhead pressure gauge or downhole sensor, and can continuously monitor multi-layer water level for a long period of time. The geophysical prospecting method is influenced by mineral components and depth, and has limited precision. The prior patent literature about pressure-bearing water level measurement mainly relates to pressure-bearing water pressure measurement, and a measurement method for simultaneously realizing distribution depth of a water layer of pressure-bearing water is not available. The patent documents related to the present utility model are referred to as follows: Chinese patent publication No. CN117738653a (publication No. 2024.03.22) discloses a device and method for hydraulic pressure measurement while drilling, the device including a water inlet and outlet port allowing fluid to enter and exit, a flow test chamber connected to the water inlet and outlet port, a seal measurement unit for sealing the water inlet and outlet port and measuring the water burst pressure of the borehole, a packer for closing the borehole, a hydraulic control unit for controlling the packer to close or unseal the borehole, a piston, and a push ring. According to the utility model, the drilling water surge pressure and the fluid flow at different positions can be measured in real time by controlling the sealing or unsealing of the drilling holes in real time, so that the redundant actions of lifting the drilling holes and replacing the drill collar are omitted. The main characteristics of the scheme lie in the improvement of the measurement while drilling and water pressure measuring device, the measuring object is water pressure of water gushing points and water gushing positions, and the measurement of the distribution depth and water pressure of the multilayer pressure-bearing water layers cannot be realized. The Chinese patent literature with the publication number of CN106192971A (publication day 2016.12.07) discloses a confined water level observation well structure and a multilayer water level observation method, wherein the water level observation well structure consists of an observation hole and a well pipe arranged outside the observation hole, the observation hole is cored into a confined water layer, the well pipe is arranged in a water stopping layer above the confined water layer, the water level in the confined water layer can be observed, when the water level of a lower confined water layer is required to be observed, only the lower confined water layer is continuously drilled in the observation hole, and two layers of confined water layer water level observation well pipes are inserted between the observation hole and the well pipe, so that the water level elevation and the pressure water head of two or more layers of confined water can be observed in one observation well. However, the scheme is mainly for improving the structure of the multi-layer water level observation well, and is to know the distribution depth of multi-layer pressure-bearing water levels, further observe the pressure-bearing water pressure, and can not directly and simultaneously measure the distribution depth and the water pressure of the multi-layer pressure-bearing water layers. Disclosure of utility model The utility model aims to solve the technical problem of providing a d