In fact, before his visit, we had already held several in-depth discussions over the phone. Mr. Zhang had clear requirements regarding the instrument’s technical principles, measurement capabilities, and actual operating conditions. His main purpose in visiting our factory was to further verify whether the equipment could solve the practical problems he was facing in his project.<\/p>\n\n\n\n
The most challenging part of this project was an inclined well nearly 500 meters deep, with an inclination angle of approximately 4 degrees.<\/p>\n\n\n\n
After learning more about Mr. Zhang’s project requirements, I realized even more clearly that the key to this purchase was not simply finding an instrument capable of measuring groundwater flow velocity and direction. What he really needed was a solution that could operate under complex deep-well and inclined-well conditions while ensuring reliable measurement data.<\/p>\n\n\n\n
Eventually, Mr. Zhang saw the equipment assembly process and an experimental demonstration at our factory. The three-dimensional measurement data appeared directly on the screen, allowing him to see the technical performance for himself. Three days after his factory visit, we received his purchase contract.<\/p>\n\n\n\n
1. A 500-Meter Deep Well with a 4-Degree Inclination: The Groundwater Measurement Challenge Facing Mr. Zhang<\/h2>\n\n\n\n
First, let me explain the actual conditions of this well.<\/p>\n\n\n\n
The well is nearly 500 meters deep, with an inclination angle of approximately 4 degrees.<\/p>\n\n\n\n
Four degrees may not sound like much. In fact, it is difficult to notice such a small angle on a drawing. However, when this angle is applied over a well depth of 500 meters, the situation becomes quite different.<\/p>\n\n\n\n
Based on a measured well depth of 500 meters and an inclination angle of 4 degrees:<\/p>\n\n\n\n
- \n
- Horizontal displacement:<\/strong> 500 \u00d7 sin4\u00b0, approximately 34.9 meters. This means the bottom of the well is horizontally displaced by about 35 meters from the wellhead.<\/li>\n\n\n\n
- Vertical depth:<\/strong> 500 \u00d7 cos4\u00b0, approximately 498.8 meters.<\/li>\n\n\n\n
- Difference between measured well depth and vertical depth:<\/strong> approximately 1.2 meters.<\/li>\n<\/ul>\n\n\n\n
This means there may be a horizontal deviation of approximately 35 meters between the wellhead coordinates and the actual position at a depth of 500 meters.<\/p>\n\n\n\n
For groundwater flow velocity and direction measurement, this is not a small error that can simply be ignored.<\/p>\n\n\n\n
If observation wells are designed and groundwater flow paths are estimated based only on the wellhead coordinates at the surface, the actual measurement position at a depth of 500 meters may already be far from the originally expected location.<\/p>\n\n\n\n
In other words, the position at the surface is not necessarily the actual position deep underground.<\/strong><\/p>\n\n\n\n
This was the first problem Mr. Zhang needed to solve: how to obtain reliable three-dimensional groundwater flow velocity and direction data under conditions involving considerable depth and an inclined well.<\/p>\n\n\n\n
2. Why Are Traditional Groundwater Flow Measurement Methods Unsuitable for This Inclined Well?<\/h2>\n\n\n\n
During our discussions with Mr. Zhang, we also reviewed some of the commonly used groundwater measurement methods in the industry.<\/p>\n\n\n\n
Traditional field procedures generally involve drilling one well upstream in the groundwater flow direction and then installing another 3 to 5 observation wells downstream. A tracer is introduced into the upstream well, and its dispersion is monitored through the downstream observation wells to calculate groundwater flow velocity and direction.<\/p>\n\n\n\n
This method has been used for many years in conventional applications, such as shallow wells and vertical wells. However, when applied to Mr. Zhang’s well, which is nearly 500 meters deep and inclined by approximately 4 degrees, three significant problems arise.<\/p>\n\n\n\n
1. Multiple Boreholes Mean Higher Project Costs<\/h3>\n\n\n\n
Traditional tracer measurement methods require multiple wells to be drilled upstream and downstream, usually totaling 4 to 6 wells.<\/p>\n\n\n\n
This means additional drilling expenses, longer construction periods, more land-use requirements, and additional coordination work.<\/p>\n\n\n\n
For Mr. Zhang’s project, the actual position of the well bottom also needed to be confirmed before the measurement could begin, so that the observation wells could be properly positioned.<\/p>\n\n\n\n
If the well is inclined, the difficulty of borehole planning and construction increases further.<\/p>\n\n\n\n
2. Deviations Between Borehole Direction and Actual Groundwater Flow Direction Can Affect Measurement Results<\/h3>\n\n\n\n
During our discussion, I also highlighted a problem associated with traditional tracer measurement methods: inconsistencies between the direction of the installed boreholes and the actual groundwater flow direction may lead to measurement deviations.<\/p>\n\n\n\n
A field dispersion test report clearly pointed out that there were differences between the results calculated using the tracer-source borehole depletion method and the observation-well receiving method. One of the reasons was related to the fact that “the direction of the installed boreholes deviated to some extent from the groundwater flow direction at the site.”<\/p>\n\n\n\n
This shows that the positions and directions of observation wells have a direct impact on the final measurement results.<\/p>\n\n\n\n
Whenever the borehole installation direction forms an angle with the actual groundwater flow direction, it may affect tracer detection and subsequent calculations.<\/p>\n\n\n\n
In Mr. Zhang’s project, the bottom of the well was already horizontally displaced by approximately 35 meters from the wellhead. To accurately position the observation wells downstream, it was first necessary to determine the actual location of the well bottom.<\/p>\n\n\n\n
This is precisely one of the more difficult aspects of inclined-well measurement.<\/p>\n\n\n\n
3. Inclined-Well Conditions May Cause Asymmetric Tracer Dispersion<\/h3>\n\n\n\n
The third problem involves tracer dispersion under inclined-well conditions.<\/p>\n\n\n\n
Because the well is inclined, the tracer may be affected by the complex flow field inside the well after being introduced, potentially resulting in asymmetric dispersion.<\/p>\n\n\n\n
If the tracer concentration curve detected downstream becomes asymmetric, this may affect the subsequent calculations of groundwater flow velocity and direction.<\/p>\n\n\n\n
Therefore, in Mr. Zhang’s project involving an inclined well nearly 500 meters deep, three problems existed simultaneously: difficulties in installing multiple wells, deviations in observation direction, and potentially asymmetric tracer dispersion.<\/p>\n\n\n\n
Traditional methods are not necessarily impossible to use, but under these specific operating conditions, both implementation costs and measurement reliability face considerable challenges.<\/p>\n\n\n\n
3. Why Didn’t the Heat-Pulse Method or Imported Equipment Solve Mr. Zhang’s Problem?<\/h2>\n\n\n\n
In addition to traditional multi-well tracer methods, Mr. Zhang had also considered heat-pulse measurement technology and investigated several imported groundwater flow velocity and direction instruments.<\/p>\n\n\n\n
However, after comparing the available options, he found that these solutions also had limitations that made them unsuitable for his project requirements.<\/p>\n\n\n\n
1. The Effective Measurement Depth of the Heat-Pulse Method Is Limited<\/h3>\n\n\n\n
The heat-pulse method works by heating water to create a thermal pulse and then tracking how the heat moves through the water to determine groundwater flow characteristics.<\/p>\n\n\n\n
However, for a well that is 500 meters deep, measurement depth becomes an essential consideration.<\/p>\n\n\n\n
Among the technical materials Mr. Zhang reviewed, there were several different depth references:<\/p>\n\n\n\n
- \n
- The USGS heat-pulse flowmeter has a stated maximum measurement depth of 350 meters.<\/li>\n\n\n\n
- Thermal Plume Optical Tracking (T-POT) mainly covers the area within 50 meters downstream of the heater.<\/li>\n\n\n\n
- The commonly accepted industry understanding in China is that heat-pulse technologies are generally suitable for water bodies within approximately 60 meters.<\/li>\n<\/ul>\n\n\n\n
These technologies do not have exactly the same measurement ranges or application conditions. However, for Mr. Zhang’s 500-meter-deep well, the heat-pulse solution could not adequately meet the actual project requirements.<\/p>\n\n\n\n
2. Imported Groundwater Flow Instruments Have Higher Purchasing and Operating Costs<\/h3>\n\n\n\n
Mr. Zhang had also investigated imported groundwater flow velocity and direction instruments.<\/p>\n\n\n\n
However, after further evaluation, he identified two main problems.<\/p>\n\n\n\n
First, the purchase price of the equipment was relatively high, making it difficult to control the overall project investment.<\/p>\n\n\n\n
Second, the actual deployment depth and pressure-resistance specifications of the supporting cables on some instruments could not meet the requirements of this 500-meter-deep well.<\/p>\n\n\n\n
For ordinary shallow wells, it may be sufficient for an instrument to complete the measurement successfully. However, for deep-well and inclined-well projects, whether the equipment can be safely lowered into the well and whether the cables can withstand the pressure and friction encountered during operation must also be considered.<\/p>\n\n\n\n
After comparing the available options, Mr. Zhang found that traditional multi-well tracer methods, heat-pulse methods, and certain imported instruments had all failed to adequately address the core requirements of his project.<\/p>\n\n\n\n
What he needed was an instrument capable of performing measurements in a single well while also meeting the requirements of a 500-meter-deep well.<\/p>\n\n\n\n
4. How Does the AML920 Groundwater Flow Velocity and Direction Meter Solve Deep-Well and Inclined-Well Measurement Problems?<\/h2>\n\n\n\n
After understanding Mr. Zhang’s actual requirements, I focused on introducing three key features of the AIMOLI AML920 Groundwater Flow Velocity and Direction Meter.<\/p>\n\n\n\n
1. Single-Well Measurement Without the Need for Multiple Additional Observation Wells<\/h3>\n\n\n\n
The AML920 uses particle-tracking measurement technology to obtain three-dimensional groundwater vector data within a single well. It does not require the additional observation wells used in traditional multi-well tracer methods.<\/p>\n\n\n\n
Its basic working principle is as follows:<\/p>\n\n\n\n
A microscopic magnification system and CCD imaging technology are used to observe and record the movement trajectories of colloidal particles in water. The instrument’s built-in geomagnetic electronic compass determines the direction, and a three-dimensional vector algorithm is then used to process the data and obtain three-dimensional groundwater flow vector information.<\/p>\n\n\n\n
For Mr. Zhang’s project, this measurement approach offered direct practical benefits.<\/p>\n\n\n\n
First, it can reduce the number of additional boreholes required, lowering construction costs and shortening the project schedule.<\/p>\n\n\n\n
Second, it does not rely on the traditional arrangement of introducing tracers upstream and receiving them through multiple downstream observation wells. This helps avoid related errors caused by deviations between observation-well installation directions and the actual groundwater flow direction.<\/p>\n\n\n\n
At the same time, it reduces the asymmetric dispersion problems that traditional multi-well tracer methods may encounter under complex inclined-well conditions.<\/p>\n\n\n\n
There is also an important industry background worth mentioning:<\/p>\n\n\n\n
In 2018, groundwater flow velocity and direction meters were included by China’s Ministry of Justice and Ministry of Ecology and Environment in the list of essential instruments for forensic identification of soil and groundwater environmental damage. This also demonstrates the important role of groundwater flow measurement data in groundwater pollution migration assessments and environmental damage liability investigations.<\/p>\n\n\n\n
2. Three-Dimensional Vector Algorithms Make Groundwater Movement More Intuitive<\/h3>\n\n\n\n
This was another technical feature I particularly emphasized when introducing the instrument to Mr. Zhang.<\/p>\n\n\n\n
Conventional groundwater flow measurement methods often mainly provide information about flow direction and velocity on a horizontal plane, namely two-dimensional vector data.<\/p>\n\n\n\n
However, actual groundwater movement is not necessarily limited to a horizontal plane.<\/p>\n\n\n\n
Especially in complex geological environments such as fractured aquifers, groundwater may have both horizontal and vertical flow components.<\/p>\n\n\n\n
If only two-dimensional data is used to describe the movement, it may not fully reflect the actual groundwater flow conditions.<\/p>\n\n\n\n
The AML920 uses a three-dimensional vector algorithm to display the movement trajectories, colors, and three-dimensional movement characteristics of particles in groundwater, helping users understand actual groundwater movement more intuitively.<\/p>\n\n\n\n
After seeing this feature, Mr. Zhang later used a very vivid expression to describe it:<\/p>\n\n\n\n
“It’s like a live broadcast of groundwater.”<\/strong><\/p>\n\n\n\n
I think this description is very appropriate.<\/p>\n\n\n\n
Instead of relying solely on indirect calculations based on changes in traditional tracer concentration, the instrument uses microscopic imaging to record the actual movement trajectories of particles in water. Combined with directional identification and three-dimensional algorithms, it presents the actual movement information of groundwater particles.<\/p>\n\n\n\n
For engineering projects and scientific research that require an understanding of complex groundwater flow conditions, this intuitive data presentation can be extremely helpful.<\/p>\n\n\n\n
3. Standard Measurement Depths of Up to 1,000 Meters, with Customization Available for Greater Depths<\/h3>\n\n\n\n
For Mr. Zhang, the measurement depth of the instrument was another important purchasing requirement.<\/p>\n\n\n\n
The standard measurement water depth range of the AML920 Groundwater Flow Velocity and Direction Meter is within 1,000 meters. For greater depths, customization is available according to the customer’s project requirements. We have already achieved a measurement depth of up to the 3,000-meter level.<\/p>\n\n\n\n
- Vertical depth:<\/strong> 500 \u00d7 cos4\u00b0, approximately 498.8 meters.<\/li>\n\n\n\n
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