Gas logging automatic calibration device and method

Abstract

The invention discloses a gas logging automatic calibration device and method, and the device comprises a flow path switching valve which can carry out the switching selection of a plurality of input flow paths, and is connected with an output (to a gas logging analyzer) flow path; the input flow path is connected with different standard gases; the at least one input flow path is connected with zero air and logging gas logging online sampling equipment; and the control circuit is used for coordinating and controlling the automatic calibration process of the gas logging analyzer according to the command of the logging instrument. In the automatic calibration process, the automatic calibration device is sequentially connected with each calibration gas input flow path and the gas measurement analyzer according to an instruction of the logging instrument for calibration; each flow path is provided with a pressure control and flow stabilization module and a pressure monitoring module to monitor whether the flow path leaks air or not; the standard gas storage area is provided with a combustible sensor and is connected with a control circuit for safety monitoring. According to the invention, the automatic calibration of the gas logging analyzer in the gas logging process can be realized, and the dead volume of a pipeline and the gas logging calibration error caused by standard gas mixing sample preparation are minimized.

Description

Technical Field

[0001] The invention relates to the technical field of gas logging in oil and gas exploration, and in particular to a gas logging automatic calibration device and method. Background Art

[0002] Gas logging is one of the core services of comprehensive logging in oil and gas exploration, and can monitor and analyze the oil and gas display of the formation in the most intuitive way. Usually, gas logging analyzers need to be calibrated regularly to ensure the accuracy and reliability of gas logging, and this process is generally completed manually.

[0003] Existing automatic gas measurement calibration methods, such as automatically adjusting the standard gas concentration through proportional valve control, or other methods of switching analysis and calibration gas lines with multi-way valves, still face many problems. The accuracy of the gas analyzer calibration is affected by the accuracy of the flow and pressure sensors, as well as the inevitable dead volume of the solenoid valve group, which will cause unnecessary loss of standard gas samples.

[0004] The Chinese invention patent application publication number CN106351639A discloses a comprehensive logging integrated equipment, including an engineering parameter sensor, a drilling fluid parameter sensor, an infrared spectrum gas logging system, a cuttings logging system, a wireless transmission system, a collector and a processor, a monitoring system, and an explosion-proof logging cabin. The comprehensive logging integrated equipment is installed at the drilling site, and the gas logging system, the cuttings logging system, the wireless transmission system, the collector and a processor, a monitoring system, and an explosion-proof logging cabin are included inside. The external drilling platform uses engineering parameter sensors and drilling fluid parameter sensors to collect drilling engineering parameters. The cuttings logging system realizes cuttings logging by automatically collecting cuttings. The cuttings logging system can separate the gas required for gas logging, replace the original degasser, and complete gas logging. The present invention can automatically collect cuttings, gas and engineering parameters, the line installation is simple, the cuttings identification accuracy is high, the labor intensity of the staff is reduced, and the work efficiency of the staff is improved. However, the patent application does not solve the problem of regular automatic calibration of the gas logging analyzer. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, one of the objects of the present invention is to provide a simple and reliable gas test automatic calibration device.

[0006] The second purpose of the present invention is to provide a gas measurement automatic calibration method to solve the problem of minimizing the dead volume of the pipeline and the gas measurement calibration error caused by mixing and sampling of the standard gas.

[0007] In order to achieve the purpose of the present invention, a gas test automatic calibration device according to a first aspect of the present invention comprises:

[0008] A flow path switching valve having a plurality of first input ends, at least one second input end, and an output end; the output end can be switched between any one of the plurality of first input ends and at least one second input end;

[0009] The number of standard gas cylinders is the same as the number of the plurality of first input ends, and different standard gas cylinders store different standard gases;

[0010] A plurality of first input flow paths for connecting a calibration gas cylinder and a first input end;

[0011] At least one second input flow path is used to connect the second input end and the zero air input end and the output end of the logging gas logging online sampling device. During the automatic calibration process, the second input flow path is switched to the zero air input end, and the output end is switched to the second input end to provide zero air purge for the gas logging analyzer. During the non-calibration process, the second input flow path is switched to the output end of the logging gas logging online sampling device, and the output end is switched to the second input end to provide the gas logging analyzer with continuous sample gas for online gas logging.

[0012] A control circuit is connected to the flow path switching valve control to enable the output end to switch between any one of the multiple first input ends and at least one second input end and coordinate the control of the gas measurement automatic calibration device and the gas measurement analyzer according to the logging instrument command to complete automatic calibration and online gas measurement.

[0013] In a preferred embodiment of the present invention, the calibration gas cylinder is connected to the first input flow path via a cylinder pressure reducing valve.

[0014] In a preferred embodiment of the present invention, all the standard gas cylinders are stored in a standard gas storage area, and at least one flammable sensor is arranged in the standard gas storage area. The flammable sensor is connected to the control circuit for safety monitoring.

[0015] In a preferred embodiment of the present invention, a pressure control and flow stabilization module and a pressure monitoring module are provided in each first input flow path to monitor whether there is leakage in the flow path.

[0016] The second aspect of the present invention is a method for automatic calibration of gas measurement: during the automatic calibration process, the automatic calibration device sequentially connects each calibration gas input flow path and the gas measurement analyzer according to the instructions of the logging instrument to perform calibration; during the online gas measurement analysis process, the automatic calibration device connects the logging gas measurement online sampling equipment and the gas measurement analyzer to perform online gas measurement analysis.

[0017] In a preferred embodiment of the present invention, the automatic calibration process is based on the components and concentration of the standard gas, generally single sample, mixed sample, and concentration from low to high, and the gas analyzer is connected in sequence for automatic calibration. Zero air purge can be performed at each standard gas calibration interval.

[0018] The present invention provides a gas measurement automatic calibration device and method, which adopts an accurate and reliable standard gas cylinder as a standard gas source, realizes the switching and automatic calibration of multiple standard gases through a flow path switching valve, and minimizes the gas measurement calibration error caused by pipeline dead volume and standard gas mixed sampling.

[0019] The invention has a simple and reliable structure, can provide automatic calibration of the gas logging analyzer at the site, and minimize the gas logging calibration error caused by pipeline dead volume and standard gas mixed sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the gas test automatic calibration device of the present invention;

[0021] Figure 2 It is a schematic diagram of the flow chart of the automatic calibration method for gas testing of the present invention. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below through the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0023] like Figure 1 The gas test automatic calibration device shown comprises:

[0024] The flow path switching valve 1 has a plurality of first input ends, at least one second input end and an output end; the output end can be switched between any one of the plurality of first input ends and at least one second input end.

[0025] The same number of standard gas cylinders as the number of the plurality of first input ends (not shown in the figure), different standard gas cylinders storing different standard gases;

[0026] Multiple first input flow paths 21-2N; different first input flow paths 21-2N are used to connect a standard gas cylinder and a first input end. The standard gas cylinder is connected to the first input flow path 21-2N through a cylinder pressure reducing valve. A pressure control and flow stabilization module 7 and a pressure monitoring module 8 are set in each first input flow path 21-2N to monitor whether there is leakage in the flow path.

[0027] At least one second input flow path 6 is used to connect the second input end and the zero air input end and the output end of the logging gas logging online sampling device. During the automatic calibration process, the second input flow path 6 is switched to the zero air input end, and the output end is switched to the second input end to provide zero air purge for the gas logging analyzer. During the non-calibration process, the second input flow path 6 is switched to the output end of the logging gas logging online sampling device, and the output end is switched to the second input end 6 to provide the gas logging analyzer with continuous sample gas for online gas logging.

[0028] A control circuit 4 is connected to the flow path switching valve 1 to realize that the output end can be switched between any one of the multiple first input ends and at least one second input end and coordinate the control of the gas measurement automatic calibration device and the gas measurement analyzer according to the command of the logging instrument to complete automatic calibration and online gas measurement.

[0029] All the standard gas cylinders are stored in a standard gas storage area, in which at least one flammable sensor 5 is arranged, and the flammable sensor 5 is connected to the control circuit 4 for safety monitoring.

[0030] A pressure control and flow stabilization module and a pressure monitoring module are provided in each first input flow path to monitor whether there is air leakage in the flow path.

[0031] like Figure 2 As shown, the automatic calibration method for gas measurement of the present invention is: during the automatic calibration process, the automatic calibration device switches to input flow path N according to the instruction of the logging instrument to perform purging, and then switches input flow paths 1 to n in sequence to perform calibration; during the online gas measurement analysis process, the automatic calibration device switches to input flow path N to perform online gas measurement analysis.

[0032] During the automatic calibration process, according to the components and concentration of the calibration gas, generally single sample, mixed sample, and concentration from low to high, the input flow path 1 to m is switched in sequence, and single sample is calibrated from low to high concentration, and m+1 to m+n are switched in sequence, and mixed sample is calibrated from low to high concentration. At each calibration interval of the calibration gas, the input flow path can be switched to N for zero air purge.

[0033] Each flow path is equipped with a pressure control and flow stabilization module and a pressure monitoring module to monitor whether there is any leakage in the flow path.

[0034] A combustible sensor 5 is provided in the standard gas storage area and connected to the control circuit for safety monitoring.

[0035] In a preferred embodiment of the present invention, the flow path switching valve 1 has 16 input interfaces, flow paths 1 to 7 are connected to methane (C1) single samples, with concentrations from small to large, flow paths 8 to 14 are connected to natural gas mixed samples (C1 to nC5), with concentrations from small to large, flow path 15 is connected to zero air, and flow path 16 is connected to the online sampling equipment for logging gas measurement. Each input flow path is provided with an electronic pressure sensor and a gas resistance to monitor whether each input flow path has leakage, whether the gas in the standard gas cylinder is sufficient, and to control the output flow of the input flow path to reduce the loss of standard gas. The output flow path 3 is provided with an electronic pressure sensor to monitor whether the output flow path has leakage.

[0036] In a preferred embodiment of the present invention, during the automatic calibration process, the automatic calibration device switches flow path 15, flow path 1 to flow path 7, flow path 15, flow path 8 to flow path 14 in sequence according to the instructions of the logging instrument, completes the automatic calibration, and switches to flow path 16 to enter the logging sampling state.

[0037] In a preferred embodiment of the present invention, when the pressure sensors of the input flow path and the output flow path, and the combustible sensor 5 detect an abnormality, the automatic calibration is stopped and an alarm signal is sent to the mud logger.

[0038] In summary, the gas measurement automatic calibration device and method described in the present invention adopts an accurate and reliable standard gas cylinder as a standard gas source, realizes the switching and automatic calibration of multiple standard gases through a flow path switching valve, and minimizes the gas measurement calibration error caused by pipeline dead volume and standard gas mixing and sampling.

[0039] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. A gas test automatic calibration device, characterized in that: Include: A flow path switching valve having a plurality of first input ends, at least one second input end, and an output end; the output end can be switched between any one of the plurality of first input ends and at least one second input end; The number of standard gas cylinders is the same as the number of the plurality of first input ends, and different standard gas cylinders store different standard gases; A plurality of first input flow paths for connecting a calibration gas cylinder and a first input end; At least one second input flow path for connecting the second input end and the zero air input end and the output end of the logging gas logging online sampling device, the second input flow path is switched to the zero air input end during the automatic calibration process, and the output end is switched to the second input end, providing zero air purge for the gas logging analyzer; During the non-calibration process, the second input flow path is switched to the output end of the logging gas logging online sampling device, and the output end is switched to the second input end to provide the gas logging analyzer with continuous sample gas for online gas logging; A control circuit is connected to the flow path switching valve control to enable the output end to switch between any one of the multiple first input ends and at least one second input end and coordinate the control of the gas measurement automatic calibration device and the gas measurement analyzer according to the logging instrument command to complete automatic calibration and online gas measurement.

2. The gas test automatic calibration device according to claim 1, characterized in that: The calibration gas cylinder is connected to the first input flow path via a cylinder pressure reducing valve.

3. The gas test automatic calibration device according to claim 1, characterized in that: All the standard gas cylinders are stored in a standard gas storage area, in which at least one flammable sensor is arranged, and the flammable sensor is connected to the control circuit for safety monitoring.

4. The gas test automatic calibration device according to claim 1, characterized in that: A pressure control and flow stabilization module and a pressure monitoring module are provided in each first input flow path to monitor whether there is air leakage in the flow path.

5. A method for automatic gas measurement calibration based on the automatic gas measurement calibration device according to any one of claims 1 to 4, characterized in that: During the automatic calibration process, the automatic calibration device sequentially connects each calibration gas input flow path and the gas measurement analyzer according to the command of the logging instrument to perform calibration; During the online gas logging analysis process, the automatic calibration device connects the logging gas logging online sampling equipment and the gas logging analyzer to perform online gas logging analysis.

6. The automatic gas test calibration method according to claim 5, characterized in that: The automatic calibration process is based on the components and concentration of the standard gas. Generally, the gas analyzer is connected in sequence for automatic calibration according to single sample, mixed sample, and concentration from low to high. Zero air purge can be performed at each standard gas calibration interval.

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