TWM563548U - Stratum gas infrared spectrum detection system - Google Patents

Abstract

A formation gas infrared spectrum detecting system comprises a wellhead pipe plug, a gas collecting pipeline, a filtering unit, a detecting and analyzing unit and a pumping sampling unit, wherein the gas collecting pipeline passes through the perforation of the wellhead pipe plug, and is connected to the filtering unit, the detecting and analyzing unit, and Pumping sampling unit. In particular, the gas-type Fourier transform infrared spectrometer of the detection and analysis unit analyzes the air filtered by the filter unit to generate test data, and the test data is analyzed by the signal analysis computer to generate and store the analysis result for display and reading. This creation can grasp the high-risk section of flammable gas seepage before the construction of the tunnel project, and then develop a comprehensive countermeasure to avoid excessively conservative design hindering the advancement of the work, or encountering a large amount of gas leakage during the construction, which may cause strain. Or risk such as disaster.

Description

Formation gas infrared spectrum detection system

This creation is about a stratigraphic gas infrared spectrum detection system, especially the infrared spectroscopy detection technology can instantly detect the concentration of methane or harmful flammable gas in the deep formation under the current drilling with the core drilling.

Generally, before excavation of the tunnel, it is necessary to first detect and analyze the characteristics of the formation, such as methane content and escape concentration, to assess the risk of excavation tunnels and to carry out precautionary measures to ensure the safety of personnel during construction. Specifically, the exploration well can be drilled on the slope above the tunnel, and after the completion of the well, the gas is collected through the orifice, sent back to the laboratory for analysis, and the whole well concentration is used to estimate the escape of methane gas. concentration.

However, the above method cannot determine the actual outgassing position, the outgassing formation characteristics, and the corresponding outgassing concentration in the formation.

In addition, during the construction period, the tunnel full line or flammable gas can be exuded from the high-risk section, and the horizontally advanced exploration drilling hole is applied to the excavation surface, and then the flammable gas in the hole is detected to understand the flammable gas in the pit. Exuding the concentration and alerting. Furthermore, flammable gas detecting devices may be set at appropriate intervals in the excavated tunnel during construction to detect.

The methods listed above are all passive surveys, and it is easy to encounter a large amount of gas leakage outside of the expected, resulting in less than the risk of downtime or brewing. Therefore, there is a great need for an innovative infrared spectrum detection system for formation gas, which can grasp the high-risk section of flammable gas seepage before tunnel construction, and then develop a comprehensive countermeasure to avoid excessive conservative design hindering the advancement, or under construction. The problem of the above-mentioned conventional technology is solved by encountering a large amount of gas that is expected to leak out, resulting in a risk of strain or disaster.

The main purpose of this creation is to provide a formation gas infrared spectrum detection system, including a wellhead plug, a gas collection pipeline, a filtration unit, a detection and analysis unit, and a pumping sampling unit for collecting, detecting and analyzing the wellhead drill placed in the well. The characteristics of the gas contained in the tube, and the drilling is deep into the formation.

The wellhead plug is an opening that is sleeved at the wellhead drill pipe and has perforations, and the gas collecting pipeline penetrates the perforation of the wellhead pipe plug for being extracted by the gas which penetrates into the well pipe of the wellhead by the formation.

The filter unit comprises at least one conical water removal bottle and an air filter, wherein the conical water removal bottle is connected to the air filter by a gas collection pipe, and is used for receiving gas in the wellhead drill pipe, filtering and collecting the collected gas. Moisture, while the air filter filters and discharges impurities or dust from the air from the conical water removal bottle.

The detection and analysis unit includes a gas-based Fourier transform infrared spectrometer and a signal analysis computer. The Fourier transform infrared spectrometer receives, analyzes, and discharges the air filtered by the air filter to generate and transmit the test data. The signal analysis computer is electrically connected to the Fourier transform infrared spectrometer for receiving and analyzing the test data, and includes a comparison standard gas database to know the type and concentration of the detected gas, and to generate and store the analysis result for Display, read.

The air sampling unit receives and discharges air from the Fourier transform infrared spectrometer, and includes a vacuum pumping pump, a gas collecting module and a needle valve, wherein the vacuum pumping pump is connected to the Fourier transform infrared spectrometer, and the gas collecting module is connected. To the vacuum pumping pump, and the needle valve is located between the air pumping pump and the gas collecting module. Further, the vacuum pumping pump pumps the air from the Fourier transform infrared spectrometer to the gas collection module for collection, and the needle valve controls the gas flow function to control the air flow of the Fourier transform infrared spectrometer into the gas production module.

The characteristic of this creation is that it can grasp the high-risk section of flammable gas seepage before the tunnel construction, and then develop a comprehensive countermeasure, which can avoid excessive conservative design hindering the progress of the work, or encountering a large amount of gas leakage during the construction. Risks such as strain or disaster.

The implementation of the present invention will be described in more detail below with reference to the drawings and component symbols, so that those skilled in the art can implement the present specification after studying the present specification.

Please also at the same time, the first figure, a schematic diagram of the formation gas infrared spectrum detection system of the present embodiment. As shown in the first figure, the formation gas infrared spectrum detecting system of the present embodiment includes a wellhead plug 10, a gas collecting line 12, a filtering unit 20, a detecting and analyzing unit 30, and a pumping sampling unit 40 for collecting and detecting The characteristics of the gas contained in the wellbore drill pipe B placed in the well A are analyzed, while the well A is deep into the formation G. For example, the gas within the wellhead drill pipe B may contain methane or a hazardous combustible gas.

Specifically, the wellhead plug 10 and the gas collecting pipeline 12 can be regarded as a gas collecting unit, wherein the wellhead plug 10 has a perforation, is penetrated by the gas collecting pipeline 12, and the wellhead plug 10 is sleeved at the wellhead drill pipe B. The opening. Therefore, the gas that has penetrated into the wellhead drill pipe B from the formation G can be withdrawn through the gas collection line 12.

The wellhead plug 10 can be a rubber product for plugging the wellhead drill pipe B during testing so as to maintain the gas tightness and vacuum in the well when the gas in the well B is extracted, in particular, the wellhead plug 10 The size can be appropriately adjusted with the size of the borehole of the wellbore drill pipe B. Furthermore, the gas collecting pipe 12 itself can be a high-pressure nylon pipe, which has the advantages of acid and alkali resistance, wear resistance and strong impact resistance, light weight and portability, and is basically a passage line connecting the gas flow of the relevant unit of the system.

Further, the filter unit 20 includes at least one conical water removal bottle 21 and an air filter 22, wherein each conical water removal bottle 21 is connected by a gas collection line 12 and is connected to the air filter 22.

The conical water removal bottle 21 receives the gas in the wellhead drill pipe B for filtering and collecting the moisture in the received gas, and is poured out after the water is accumulated in the bottle, thereby preventing moisture or well in the well during the detection process. The water with too high a groundwater level is directly poured into the subsequent processing unit to provide buffering and protection functions to avoid damage or damage. In addition, if too much moisture is encountered and the water in the bottle is too fast, a plurality of conical water bottles 21 can be continuously connected in series to buffer as a buffer to increase the water collecting capacity. Further, the conical water removal bottle 21 may be made of glass or polytetrafluoroethylene (PTFE). The air filter 22 mainly filters and discharges impurities or dust in the air from the conical water removal bottle 21, and can periodically change the filter core therein.

The detection analysis unit 30 includes a gas-type Fourier Transformation Infrared Spectrometer (FTIR) 31 and a signal analysis computer 32, wherein the Fourier-converted infrared spectrometer 31 receives and discharges the air filtered by the air filter 22.

The signal analysis computer 32 is electrically connected to the Fourier transform infrared spectrometer 31. Further, the Fourier transform infrared spectrometer 31 is the core equipment of the creation of the formation gas infrared spectrum detection system, mainly using the self-injected infrared light source, and then detecting the air entering the optical path test cavity through the built-in interferometer. Know the characteristics of the unknown gas, and then generate and transmit the test data.

In addition, the signal analysis computer 32 is electrically connected to the Fourier transform infrared spectrometer 31 for receiving and analyzing the detection data from the Fourier transform infrared spectrometer 31, mainly by comparing the standard gas database, and further knowing the type and concentration of the detected gas. And generate and store the analysis results for display and reading.

Furthermore, the pumping sampling unit 40 receives and discharges air from the Fourier transform infrared spectrometer 31, and includes a vacuum pumping pump 41, a gas collecting module 42 and a needle valve 43, wherein the vacuum pumping pump 41 is connected to the Fourier transform The infrared spectrometer 31 is connected to the vacuum pumping pump 41, and the needle valve 43 is located between the air pumping pump 41 and the gas collecting module 42. Specifically, the vacuum pumping pump 41 pumps the air from the Fourier transform infrared spectrometer 31 to the gas recovery module 42 for collection, and the needle valve 43 controls the gas flow function, and can control the Fourier transform infrared light according to actual operation needs. The flow rate of the spectrometer 31 flows into the gas production module 42.

For example, the vacuum pumping pump 41 has a maximum output pressure of at least 60 psi and a maximum vacuum of 25.5 inHg or 647.7 mmHg, that is, only 0.1 to 0.2 atm per unit volume, and 30 per minute. The ability of liter gas above. In addition, the gas production module 42 can be a gas sampling bag, such as Tedlar material sold by DuPont, which has excellent storage rate, is chemically inert, strong, flexible, and resistant to tension, and can be repeatedly applied. Characteristics.

The pumping sampling unit 40 may further include a one-way exhaust valve 44 disposed at an end connected to the branch line for discharging the unidirectional exhaust gas to the outside according to actual needs, in particular, only discharging the gas without leaving the outside. The gas enters, wherein the front end of the branch line is connected to the vacuum pumping pump 41 and the gas collecting module 42. For example, when the gas received by the gas production module 42 is excessive, the additional gas is discharged through the one-way exhaust valve 44, or when the gas is not collected by the gas production module 42, that is, when the needle valve 43 is closed. In the gas passage, all the gas is discharged to the outside by the one-way exhaust valve 44.

In addition, the creation of the formation gas infrared spectrum detection system can be further configured with a quick-release needle valve (not shown) that is configured to be located at the front end of the wellhead plug 10 for testing the entire system before beginning to detect the gas in the well. Use when leaking. In other words, when the quick-release needle valve is closed, the gas in the wellhead drill pipe B can be prevented from entering the system. At this time, if the gas is still detected, the system pipeline or the constituent unit is leaking. It must be dealt with immediately to prevent misjudgment of the system and improve the accuracy of the test.

Hereinafter, please refer to the second figure, according to the application example of the formation gas infrared spectrum detection system of the present embodiment, to illustrate the specific operation content and the achievement effect of the creation.

When the location of the exploration well above the tunnel has been completed, the geological drilling and core tools can be set up at the planning location. After the drilling tool is erected, the wellhead plug 10, the cone water bottle 21, the air filter 22, the gas type Fourier transform infrared ray 31, the analysis computer device 32, the vacuum pumping pump 41 and the gas collecting module 42 can be used. The connection is completed in sequence with the gas collection line 12. In addition, if the groundwater level is close to the surface, the vacuum pumping pump 41 can easily extract the water vapor from the surface, and a plurality of conical water removal bottles 21, such as 2 to 3 conical water removal bottles 21, can be connected in series to effectively achieve moisture. The function of buffer removal. Next, a system leak test procedure is performed. The wellhead plug 10 at the front end of the entire system can be locked with a temporary quick release needle valve, and the vacuum pumping pump 41 and the gas type Fourier transform infrared spectrometer 31 and the signal analysis computer 32 can be simultaneously activated. At this time, the front end of the system is locked by the needle valve, and the gas in the wellhead drill pipe B is continuously pumped to the one-way exhaust valve 44 at the tail end of the system to discharge the gas, so that the gas is exhausted. The gas pressure of the wellhead plug end 10 of the Fourier transform infrared spectrometer 32 to the front end will continue to decrease until the pressure value is displayed to be 200 torr (about 0.26 atm), that is, the detection system leak detection procedure is completed.

Then, the quick-release needle valve connected with the wellhead pipe plug 10 is removed, and the rubber material wellhead pipe plug 10 is smoothly plugged in the wellhead drill pipe B to expose the first section of the drill pipe mouth of the surface, and after being plugged, The wellhead plug 10 is carefully wrapped and secured at the seam of the wellhead drill pipe B with a gas barrier tape.

When everything is ready, the vacuum pumping pump 41, the gas type Fourier transform infrared spectrometer 31, and the signal analysis computer 32 are synchronously activated to perform formation gas component concentration detection for detecting the drilling depth.

Specifically, when the drilling depth is less than 150 meters and the pumping is continued for about 20 minutes until the well pressure remains 100 to 200 torr, the pumping time is continuously accumulated to 30 minutes. If the gas type Fourier transform infrared spectrometer 31 and the signal analysis computer 32 synchronously detect and process the data without any gas component and concentration reaction, the test can be stopped.

When drilling to a depth of 150~250 meters, it is necessary to continue pumping for about 30 minutes until the well pressure is 100~200 torr, and the pumping time can be continued for up to 40 minutes. If there is no reaction of any gas components and concentrations, the test can be stopped.

When the drilling depth is more than 250 meters, it is necessary to continue pumping for about 40 minutes until the pressure in the well is 100~200 torr, and then continue to accumulate the pumping time to 60 minutes. If there is no reaction of any gas components and concentrations, the test can be stopped.

If there is gas composition and concentration reaction during the above detection, the detection time must be extended until the preset Peak Concentration or Residual Concentration is obtained.

Finally, the methane concentration measured by the depth measurement points of all the detection wells can be used, and the equivalent permeability coefficient (Ks), fracture permeability coefficient (Kf) and bedrock (supplied by Singhal and Gupta in 2010) are used. Km) The empirical relationship of the permeability coefficient, in conjunction with Darcy's law and the ratio of the enlargement effect of the tunnel section to the borehole test section, and then estimate the position along the stratum of the formation G and may instantaneously escape on the excavation tunnel mileage. Gas concentration (%).

In summary, the main feature of this creation is that it can grasp the high-risk section of flammable gas seepage before the tunnel construction, and then develop a comprehensive countermeasure, which can avoid excessive conservative design hindering the progress of the work, or encountering expectations during construction. Excessive gas oozes out, causing risks such as strain or disaster.

In addition, this creation can reduce the number of geological exploration wells drilled, save engineering exploration funds, and effectively evaluate the percentage of gas outflow in the unexcavated section of the tunnel, and inform the warning of the gas explosion risk warning tunnel in advance to make relevant response. In addition, you can accurately understand the characteristics of the rock disk in the gas outing position of the formation and understand the gas types and characteristics of the formation.

The above description is only for the purpose of explaining the preferred embodiment of the present invention, and is not intended to impose any form of limitation on the creation, so that any modification or alteration of the creation made in the same creative spirit is provided. , should still be included in the scope of protection of this creative intent.

10‧‧‧ Wellhead pipe plug
12‧‧‧ gas collecting pipeline
20‧‧‧Filter unit
21‧‧‧Conical water removal bottle
22‧‧‧Air filter
30‧‧‧Detection and analysis unit
31‧‧‧Fourier Transform Infrared Spectrometer
32‧‧‧Signal Analysis Computer
40‧‧‧Sampling unit
41‧‧‧Vacuum pumping pump
42‧‧‧ gas production module
43‧‧‧needle valve
44‧‧‧One-way exhaust valve
A‧‧‧Drilling
B‧‧‧ wellhead drill pipe
G‧‧‧ formation

The first figure shows a schematic diagram of a formation gas infrared spectrum detection system in accordance with the presently-created embodiment. The second figure shows a schematic diagram of an application example of a formation gas infrared spectrum detecting system according to the present embodiment.

Claims (5)

A formation gas infrared spectrum detecting system, comprising: a wellhead pipe plug, is an opening that is sleeved on a wellhead drill pipe, and has a perforation, the wellhead drill pipe is in a drilling hole, and the drilling hole is deep into a ground layer a gas collection line through which the perforation of the wellhead plug is penetrated for gas to be infiltrated into the wellhead drill pipe by the formation; a filter unit comprising at least one conical water removal bottle and an air filter The at least one conical water removal bottle is connected to the air filter by the gas collection pipeline, and the at least one conical water removal bottle receives the gas in the wellhead drill pipe to filter and collect the moisture in the received gas. The air filter filters and discharges impurities or dust from the air of the conical water removal bottle; a detection and analysis unit comprising a gas-type Fourier Transformation Infrared Spectrometer (FTIR) and a signal analysis computer, The Fourier transform infrared spectrometer receives, analyzes and discharges the air filtered by the air filter, thereby generating and transmitting a detection data, The analysis computer is electrically connected to the Fourier transform infrared spectrometer for receiving and analyzing the test data, including comparing a standard gas database, thereby knowing the type and concentration of the detected gas, and generating and storing an analysis. The result is for display and reading; and a pumping sampling unit receives and discharges air from the Fourier transform infrared spectrometer, and includes a vacuum pumping pump, a gas collecting module and a needle valve, the vacuum The pumping pump is connected to the Fourier transform infrared spectrometer, and the gas collecting module is connected to the vacuum pumping pump, and the needle valve is located between the air pumping pump and the gas collecting module, the vacuum The pumping pump pumps air from the Fourier transform infrared spectrometer to the gas collection module for collection, and the needle valve controls a gas flow function for controlling the air flowing into the gas collection module by the Fourier transform infrared spectrometer The flow rate, wherein the gas in the wellhead drill pipe contains methane or a harmful combustible gas. The formation gas infrared spectrum detection system according to the scope of claim 1 , wherein the wellhead pipe plug is a rubber product, the gas collection pipeline is a high pressure nylon tube, which has acid and alkali resistance, wear resistance, strong impact resistance, light weight and portable Characteristics. The formation gas infrared spectrum detecting system according to the first aspect of the patent application scope, wherein the tapered water removal bottle is made of glass or polytetrafluoroethylene (PTFE) material, and the gas collecting module is a gas sampling bag. The formation gas infrared spectrum detecting system according to claim 1 , wherein the suction sampling unit further comprises a one-way exhaust valve disposed at an end connected to a branch line for unidirectionally discharging gas Discharged to the outside without external air entering, a front end of the branch line is connected to the vacuum pumping pump and the gas collecting module. According to the infrared gas spectrum detection system of the formation gas of the first application scope of the patent application, a quick-release needle valve is further disposed at the front end of the wellhead plug for use in performing a leak test.