A method and device for testing lithologic humidity of the entire well section in a loess area

Abstract

The present invention belongs to the technical field of lithologic testing in loess wells, and specifically discloses a method and device for testing lithologic moisture content in a full-well section in a loess well. The device includes a host computer with built-in host computer software, a control box, and at least one humidity sensor; the control box is provided with a signal acquisition module and a 485 conversion module; the signal acquisition module controls the start and end of the humidity sensor signal acquisition operation and uploads the humidity signal from the humidity sensor to the host computer via the 485 conversion module; the host computer performs voltage-to-humidity data conversion via the host computer software, and further processes the data to obtain lithologic moisture distribution data for the full-well section in a loess well. The present invention can solve the problem of poor scientific design of the excitation well depth due to the lack of quantitative analysis in the past, and achieves accurate measurement of the humidity content at the excitation well depth in loess areas, which can be used to scientifically guide the design of the excitation well depth and improve data quality. The method is suitable for testing lithologic moisture content in loess wells.

Description

Technical Field

[0001] The invention belongs to the technical field of lithology testing in loess wells, and relates to a method and device for testing lithology humidity in a whole well section in a loess well. Background Art

[0002] Loess plateaus, also known as loess platforms or loess table-shaped plateaus, are flat, broad loess deposits cut by gullies. In my country, loess plateaus are primarily found in the western Loess Plateau region.

[0003] In the loess plateau region, the quality of a single shot varies significantly depending on the well depth. The ideal excitation depth is to place the charge in moist loess. However, current methods rely on empirical judgment to determine moist loess without quantitative analysis, resulting in poorly designed excitation well depths. For example, the surface of the loess plateau region on the eastern edge of Hubei Province is covered by a thick layer of loess. This dry, loose layer, 100-200 meters thick, severely absorbs and attenuates seismic waves, resulting in a low signal-to-noise ratio for the excitation data. Summary of the Invention

[0004] The purpose of the present invention is to provide a device for testing the lithologic humidity of the entire well section in the loess region, to quantitatively test and analyze the lithologic humidity of the entire well section in the loess region, and to accurately measure the humidity of the deep well in the loess region;

[0005] Another object of the present invention is to provide a method for testing the lithologic humidity of the entire well section in a loess region using the above-mentioned lithologic humidity testing device for the entire well section in a loess region.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0007] A device for testing lithologic humidity in a whole section of a well in a loess region comprises a control box, at least one humidity sensor, and sensor carriers equal in number to the humidity sensors, wherein the humidity sensors are mounted on the sensor carriers in a one-to-one correspondence; and further comprises a host computer, wherein the host computer software is provided in the host computer.

[0008] The control box is equipped with a signal acquisition module and a 485 conversion module;

[0009] The control signal output end of the signal acquisition module is connected to the control signal input end of the humidity sensor to control the start and end of the humidity sensor signal acquisition action; the signal output end of the humidity sensor is connected to the signal input end of the signal acquisition module, and the humidity signal output end of the signal acquisition module is connected to the signal input end of the host computer through the 485 conversion module;

[0010] The host computer performs voltage-humidity data conversion through the host computer software, and after further processing, obtains the lithologic moisture distribution data of the entire well section in the loess area;

[0011] The sensor carrier is a detector housing;

[0012] The humidity sensor is a patch-type humidity sensor, the back of which is attached to the outer wall of the corresponding detector housing and the front is exposed; the front refers to the sensitive surface of the humidity sensor, and the back refers to the opposite side of the sensitive surface;

[0013] The humidity sensor is connected to the main wiring harness through the sensor wiring harness provided in the housing of its corresponding detector, and the main wiring harness is respectively connected to the signal acquisition module;

[0014] Each detector housing is provided with at least one air bag on its outer side wall, and the air bag and the humidity sensor attached to the same detector housing are symmetrical with respect to the detector housing;

[0015] The device for testing lithologic humidity of the entire well section in a loess region further comprises an air pumping device, and the air inlet of the air bag is connected to the air outlet of the air pumping device through an inflation tube.

[0016] As a limitation, the humidity sensor includes a sensor body on which a sensor chip and a sensor electrode are mounted; a signal output end of the sensor electrode is connected to a signal input end of the sensor chip.

[0017] A method for testing lithologic moisture content in a whole well section in a loess region is implemented using the above-mentioned device for testing lithologic moisture content in a whole well section in a loess region. The method comprises the following steps performed in sequence:

[0018] S1. Arrange the sensor carrier with the humidity sensor in the loess well as required. After placing the detector housing at the target location, inflate the airbag using the pumping device. Push the detector housing through the airbag to ensure that the sensitive surface of the humidity sensor is in full contact with the soil on the well wall at the target location.

[0019] S2. The signal acquisition module in the control box controls the humidity sensor to test the soil humidity at its location. The humidity sensor outputs the test data in the form of voltage to the signal acquisition module.

[0020] S3, the signal acquisition module outputs the received voltage data signal to the host computer through the 485 conversion module;

[0021] S4. The host computer converts the received data into voltage-humidity data through the host computer software, and obtains the lithologic moisture distribution data of the entire well section in the loess area after further processing.

[0022] As a limitation, the voltage-humidity data conversion process converts voltage format data into humidity percentage format data.

[0023] As a second limitation, after completing step S4, step S5 is further performed. In step S5, the upper computer software prepares a lithologic moisture distribution map of the entire well section based on the lithologic moisture distribution data of the entire well section in the loess area.

[0024] Due to the adoption of the above technical solution, the present invention has achieved the following technical advancements compared with the prior art:

[0025] (1) The present invention can solve the problem that the design of the excitation well depth is less scientific because the wet loess is judged by manual experience without quantitative analysis. The method and device designed by the present invention can realize the accurate measurement of the wetness of the excitation well depth in the loess area, which can be used to scientifically guide the design of the excitation well depth and improve the data quality.

[0026] (2) The method and device of the present invention can effectively improve work efficiency, realize quantitative measurement of loess moisture in the well, ensure that the excitation well depth is below the top interface of the moist loess, and improve the quality of the excitation single shot data;

[0027] (3) The humidity sensor in the present invention adopts a patch-type humidity sensor, which is directly attached to the detector housing. The humidity sensor can be placed at the target position by making full use of the existing test equipment. At the same time, the patch-type humidity sensor is conducive to full contact with the well wall. An air bag is further installed on the outer wall of the detector housing. By inflating the air bag, the detector housing can be pushed to make the humidity sensor closely contact with the soil on the well wall at the target position. The above-mentioned structural arrangement is ingenious, which does not increase the difficulty of arranging the detector in the well and improves the accuracy of the test results.

[0028] The present invention belongs to the technical field of well lithology testing in loess areas, and can quantitatively measure the moisture content of loess in the well, thereby improving the quality of single-shot excitation data. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0030] In the attached figure:

[0031] Figure 1 This is a block diagram of the structural principle of Example 1 of the present invention;

[0032] Figure 2 Schematic diagram of the structure of the humidity detector in Example 1 of the present invention;

[0033] Figure 3 Schematic diagram of the internal structure of the humidity sensor according to embodiment 1 of the present invention;

[0034] Figure 4 This is a circuit diagram of embodiment 1 of the present invention;

[0035] Figure 5 This is the humidity distribution diagram in the well measured in Example 2 of the present invention.

[0036] In the figure: 1. sensor carrier, 2. humidity sensor, 21. sensor body, 22. sensor chip, 23. sensor electrode, 3. sensor wiring harness. DETAILED DESCRIPTION

[0037] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0038] Example 1 A device for testing lithologic humidity in a well in a loess region

[0039] like Figure 1 As shown, this embodiment includes a signal control box and five humidity detectors, and also includes a host computer, in which the host computer software is set.

[0040] like Figure 2 As shown, the humidity detector includes a sensor carrier 1 and a humidity sensor 2 mounted on the sensor carrier 1. In this embodiment, the sensor carrier 1 is a detector housing, and the humidity sensor 2 is a patch-type humidity sensor. Its back side is bonded with sealant and attached to the outer wall of the detector housing, leaving the front side exposed. Different humidity sensors 2 are attached to different outer walls of the detector housing. The front side refers to the sensitive surface of the humidity sensor 2, and the back side refers to the side opposite the sensitive surface. Each outer wall of the detector housing is provided with at least one airbag, which is symmetrical with the humidity sensor 2 attached to the same detector about the detector housing. This embodiment also includes an air pump, the air inlet of which is connected to the air outlet of the air pump via an inflation tube.

[0041] The control box is equipped with a signal acquisition module and a 485 conversion module. Figure 4 As shown, the control signal output of the signal acquisition module is connected to the control signal input of humidity sensor 2, controlling the start and end of humidity sensor 2's signal acquisition. The humidity sensor 2's signal output is connected to the signal input of the signal acquisition module, which in turn is connected to the signal input of the host computer via a 485 conversion module. The host computer software performs voltage-to-humidity data conversion, and further processes it to obtain lithologic moisture distribution data for the entire well section in the loess region. Specifically, humidity sensor 2 is connected to the main wiring harness via a sensor harness 3 located within its corresponding geophone housing, which in turn is connected to the signal acquisition module.

[0042] like Figure 3As shown, humidity sensor 2 includes a sensor body 21, on which is mounted a sensor chip 22 and a sensor electrode 23. The signal output terminal of sensor electrode 23 is connected to the signal input terminal of sensor chip 22. During use, sensor chip 22 is disposed within sensor body 21, with the side of sensor electrode 23 facing the sensitive surface exposed.

[0043] In this embodiment, the humidity sensor 2 is powered by a DC 1.8-5V wide voltage, with an operating current of 16mA and a peak current of 40mA. The sensor harness 3 consists of three wires: power supply, cathode, and signal. The signal voltage is 0-3.3V and is linearly calculated with the moisture content of 0-100%. Figure 4 As shown, the signal acquisition module directly uses a 12V voltage, which is converted to 5V DC by a 5V voltage-regulated power supply using a step-down chip. The signal output by humidity sensor 2 is transmitted via sensor harness 3 to the main harness and then to the signal acquisition module. The signal acquisition module is connected to the host computer via a USB-to-485 adapter (DAM3232N, manufactured by Altai Technology).

[0044] For convenience, Figure 1 Only the first, second, and fifth moisture detectors are shown. In actual operation, the different moisture detectors are connected in parallel, and their locations in the well are different. This embodiment uses five moisture detectors for illustration purposes only. In actual use, the number can be changed as needed. For ease of understanding, Figure 2 The structural diagram of the humidity detector is given to show its internal structure.

[0045] In this embodiment, the sensor chip 22 uses a TaoTimeClub capacitive soil moisture sensor chip, the signal acquisition module uses the Beijing Altai Technology DAM3055N analog voltage and current 485 module, and the host computer software uses Modbus Debug Wizard V1.024. To save costs, this embodiment uses the existing micro-logging geophone housing as the sensor carrier 1.

[0046] Example 2 A method for testing lithologic moisture in a well in a loess region

[0047] This embodiment is implemented using embodiment 1. The method includes the following steps performed in sequence:

[0048] S1. Place the humidity detector in the well in the loess area as required and record the depth of the target position of the humidity detector so that the sensor electrode 23 is in full contact with the soil on the well wall at the target position; the control box, aeration device, and host computer are all placed on the ground;

[0049] Specifically, after the humidity detector is placed at the target location, the airbag is inflated through the air pump device, and the airbag pushes the detector housing. When the airbag is inflated and the detector housing is lifted up, the sensitive surface of the humidity sensor 2 is fully in contact with the soil on the well wall at the target location, that is, the electrode of the humidity sensor 2 is pressed tightly against the well wall and is in full contact with the soil on the well wall;

[0050] S2, controlling the humidity sensor 2 to test the soil humidity at its location through the signal acquisition module in the control box, and the humidity sensor 2 outputs the test data in the form of voltage to the signal acquisition module;

[0051] S3, the signal acquisition module outputs the received voltage data signal to the host computer through the 485 conversion module;

[0052] In step 4, the host computer software converts the received data into voltage-to-humidity data. After further processing, the data is combined with the depth of the target humidity detector position to obtain the lithologic moisture distribution data for the entire well section in the loess region. Ultimately, this moisture value guides the design of the stimulation well depth, ensuring that the stimulation well depth is 3 meters below the top surface of the moist loess.

[0053] The voltage-humidity data conversion process converts voltage format data into humidity percentage format data. The details are as follows: During construction, run the analog signal acquisition software to convert the voltage format into humidity percentage format. After setting and saving, collect the sensor humidity measurement data. After the collection is completed, save the collected data into a humidity value file for storage.

[0054] In order to optimize this embodiment and make the final test results more intuitive, step S5 is performed after completing step S4. In step S5, the host computer software produces a lithologic moisture distribution map of the entire well section based on the lithologic moisture distribution data of the entire well section in the loess area. Figure 5 It can be seen that the method provided in this embodiment can quantitatively measure the distribution curve of the humidity in the well as the depth.

Claims

1. A device for testing lithologic humidity in the entire well section of a loess region, characterized in that: The system comprises a control box and at least one humidity sensor, and a number of sensor carriers equal to the number of humidity sensors, wherein the humidity sensors are mounted on the sensor carriers in a one-to-one correspondence; and further comprises a host computer, wherein the host computer software is provided in the host computer; The control box is equipped with a signal acquisition module and a 485 conversion module; The control signal output end of the signal acquisition module is connected to the control signal input end of the humidity sensor to control the start and end of the humidity sensor signal acquisition action; the signal output end of the humidity sensor is connected to the signal input end of the signal acquisition module, and the humidity signal output end of the signal acquisition module is connected to the signal input end of the host computer through the 485 conversion module; The host computer performs voltage-humidity data conversion through the host computer software, and after further processing, obtains the lithologic moisture distribution data of the entire well section in the loess area; The sensor carrier is a detector housing; The humidity sensor is a patch-type humidity sensor, the back of which is attached to the outer wall of the corresponding detector housing and the front is exposed; the front refers to the sensitive surface of the humidity sensor, and the back refers to the opposite side of the sensitive surface; The humidity sensor is connected to the main wiring harness through the sensor wiring harness provided in the housing of its corresponding detector, and the main wiring harness is respectively connected to the signal acquisition module; Each detector housing is provided with at least one air bag on its outer side wall, and the air bag and the humidity sensor attached to the same detector housing are symmetrical with respect to the detector housing; The device for testing lithologic humidity of the entire well section in a loess region further comprises an air pumping device, and the air inlet of the air bag is connected to the air outlet of the air pumping device through an inflation tube.

2. The device for testing lithologic humidity in the entire well section in a loess region according to claim 1, characterized in that: The humidity sensor comprises a sensor body on which a sensor chip and a sensor electrode are mounted; a signal output end of the sensor electrode is connected to a signal input end of the sensor chip.

3. A method for testing lithologic humidity of the entire well section in a loess region, implemented using the lithologic humidity testing device for the entire well section in a loess region according to claim 1 or 2, characterized in that: The method comprises the following steps performed in sequence: S1. Arrange the sensor carrier with the humidity sensor in the loess well as required. After placing the detector housing at the target location, inflate the airbag using the pumping device. Push the detector housing through the airbag to ensure that the sensitive surface of the humidity sensor is in full contact with the soil on the well wall at the target location. S2. The signal acquisition module in the control box controls the humidity sensor to test the soil humidity at its location. The humidity sensor outputs the test data in the form of voltage to the signal acquisition module. S3, the signal acquisition module outputs the received voltage data signal to the host computer through the 485 conversion module; S4. The host computer converts the received data into voltage-humidity data through the host computer software, and obtains the lithologic moisture distribution data of the entire well section in the loess area after further processing.

4. The method for testing lithologic humidity in the entire well section in the loess region according to claim 3, characterized in that: The voltage-humidity data conversion process converts voltage format data into humidity percentage format data.

5. The method for testing lithologic humidity of the entire well section in a loess region according to claim 3 or 4, characterized in that: After completing step S4, step S5 is performed. In step S5, the upper computer software prepares a lithologic moisture distribution map of the entire well section in the well according to the lithologic moisture distribution data of the entire well section in the loess area.

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