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Coalbed methane well drainage solutions for the coal industry
Category:
Oil and gas Internet of Things (IoT) solutions
Publish Time:
2021-10-14
1. Overview
In the production process of coalbed methane wells, echo meters are usually used to monitor changes in the annulus liquid level, and the stable and continuous pressure reduction is achieved by controlling the liquid level drop speed. Currently, the commonly used echo meters are designed based on oil and gas well liquid level determination, and there are many problems in their application to coalbed methane wells. The particularity of coalbed methane production requires it to have shallow liquid level, high precision, and anti-interference testing performance, and also a safe sound source and an intuitive liquid level data management system. The coalbed methane well liquid level tester developed for the characteristics of coalbed methane production SM40YBC-20 better meets these needs.
New coal chemical projects have broad prospects. China's energy structure is characterized by abundant coal, less oil, and poor gas. , From a macro perspective, , Using coal as a raw material to produce natural gas, petroleum, methanol, etc. , is an effective way to produce alternative petroleum products through non-petroleum routes. From the current technological conditions, , Coal-to-natural gas is a relatively efficient energy conversion scheme. Moreover, , China solves the current and future demand for natural gas , Utilizing abundant coal resources , Actively developing coal-to-natural gas , From remote coal-rich areas to the national consumer market via long-distance pipelines , It has strategic significance in terms of energy security and energy saving and emission reduction.
2. Measurement range and accuracy
1. Dynamic liquid level: 0 ~ 3000m 0.5% F.S。
3. Industry characteristics:
1. Importance of annulus liquid level control in coalbed methane production
Coalbed methane is mainly adsorbed on the surface of the coal matrix. When the formation pressure drops to the desorption pressure of the coal seam, the methane in the coal seam will desorb. Coalbed methane extraction is a process of drainage and pressure reduction. The pressure drop of the coal seam is achieved through drainage and production, that is, using drainage and production equipment, oil pipe drainage, and casing gas production. As the drainage progresses, the annulus liquid level drops, and the coal seam pressure also drops. Controlling the coal seam pressure drop rate and using a reasonable production pressure difference for drainage and production are particularly important for the output of coalbed methane. It is generally believed that:
（ 1) Too fast a liquid drop speed is not conducive to expanding the pressure drop area, forming a large pressure drop funnel, which is not conducive to the desorption of coalbed methane from the wellbore. (2) Too fast a liquid drop speed destroys the original state of the coal seam, which will damage the fracture system of the coal seam and cause a decrease in permeability.
（ 3) Too fast a liquid drop speed causes a large amount of coal powder and sand to come out of the coal seam, causing the coal seam to collapse, blocking the gas-water channel, reducing production, and causing pump sticking, making drainage and production impossible to proceed normally.
（ 4) Too slow a liquid drop speed prolongs the drainage and production time and increases investment.
（ 5) An appropriate liquid drop speed makes the drainage capacity of the pump adapt to the liquid supply capacity of the coal seam, fully utilizes the formation energy, and ensures that the annulus liquid level drops evenly, slowly, continuously, or stably.
The control of the liquid drop rate is actually often achieved through the control of the annulus liquid level. To control the liquid level well, first, the liquid level must be accurately and timely determined; otherwise, liquid level control cannot be discussed. Especially in the early stage of drainage and production or when approaching the critical desorption pressure, the gas and water production changes greatly, causing fluctuations in the annulus liquid level, and frequent measurements are required. Therefore, annulus liquid level determination is an important and frequent task in coalbed methane production.
2. China is a country with scarce oil resources, but China's coal resources are relatively abundant, and the country has invested heavily in new energy sources. Coalbed methane, as a new energy source, has a huge market space and is mostly a new market.
4. System configuration:
Table 1. Coalbed Methane Well Liquid Level Testing System Configuration
| Serial number |
Name |
Model |
Quantity |
| 1. |
Wireless portable testing and diagnostic instrument |
SM40YBC-20 |
1 Units |
| 2. |
Cylinder type wellhead connector |
SMJ-07 |
1 Units |
Keywords: Coal industry, wireless portable testing and diagnostic instrument, cylinder type wellhead connector, coalbed methane well drainage, coalbed methane well liquid level testing system
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