A pressure-maintaining core free gas collection device

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By designing a pressure-maintaining core free gas collection device consisting of a gas collection device support, a gas collection cylinder, and a control switch assembly, the problems of low data accuracy and inability to work continuously in existing equipment were solved, achieving efficient and accurate free gas collection and analysis.

CN224535537UActive Publication Date: 2026-07-21BEIJING INST OF EXPLORATION ENG

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: BEIJING INST OF EXPLORATION ENG
Filing Date: 2025-08-29
Publication Date: 2026-07-21

AI Technical Summary

Technical Problem

Existing pressure-holding core free gas collection equipment suffers from low data accuracy, inability to operate continuously, and lack of sampling and ignition testing functions, which limits the efficiency and quality of pressure-holding core collection operations.

Method used

A device was designed that includes a gas collection device support, first and second gas collection cylinders, and a control switch group. The first gas collection cylinder collects free gas and performs ignition tests, the second gas collection cylinder collects water, and the control switch group enables flexible control of the pipeline. Multiple gas collection cylinders are used alternately to achieve continuous collection.

Benefits of technology

It improved data accuracy, enabled continuous operation, met various data acquisition needs, and improved operational efficiency and accuracy.

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Abstract

The utility model discloses a kind of pressure-maintaining core free gas collection devices, it is related to oil and gas exploration technical equipment field.The device includes gas collection device support and the gas collection cylinder group arranged thereon, and the gas collection cylinder group includes the first gas collection cylinder for collecting free gas and the second gas collection cylinder for receiving discharge water.The first gas collection cylinder top end is equipped with sampling ignition pipe, bottom end is equipped with air inlet pipe and communicating pipe;The top end of second gas collection cylinder is connected with communicating pipe and is equipped with exhaust pipe, bottom end is equipped with drain pipe.The device is also provided with control switch group, including multiple quick plug switches installed on each pipeline.The device structure is reasonable, realizes the effective separation and collection of free gas and water, is convenient for sampling detection and ignition test, convenient to operate, high reliability, effectively improves the efficiency and quality of pressure-maintaining core free gas collection, provides strong support for oil and gas resource evaluation and development.

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Description

Technical Field

[0001] This utility model relates to the field of conventional and unconventional oil and gas exploration technology and equipment, and more specifically to a pressure-maintaining core free gas collection device, which is suitable for free gas collection in conventional and unconventional pressure-maintaining core sampling operations for coalbed methane, shale gas, natural gas hydrates, etc. Background Technology

[0002] In the field of oil and gas exploration, especially in the exploration of conventional and unconventional oil and gas resources such as coalbed methane, shale gas, and natural gas hydrates, pressure-preserving coring is one of the key steps in obtaining underground oil and gas information. Through pressure-preserving coring, core samples that maintain their original formation pressure can be obtained, allowing for the analysis of free gas within the core, providing important data for the assessment and development of oil and gas resources.

[0003] However, existing pressure-maintaining core free gas collection equipment has many shortcomings. The collection process typically employs the drainage gas collection method, which, while simple, presents numerous problems in practice. First, the accuracy of the collected data is low, failing to provide accurate and reliable data support for subsequent analysis and research. This is extremely critical in oil and gas exploration, as even minor data deviations can lead to misjudgments of oil and gas reserves and quality.

[0004] Secondly, existing gas collection equipment cannot meet the requirements for continuous operation. In actual operation, pressure-holding coring often needs to be carried out continuously for a long time, while existing equipment needs to be shut down after collecting a full volume of gas. This not only reduces operational efficiency but may also cause some important data collection opportunities to be missed. In addition, existing equipment does not have the functions of sampling and testing, and ignition testing. Sampling and testing are important means of verifying gas composition and quality, while ignition testing can directly assess the flammability and energy potential of the gas. The lack of these functions makes it impossible for research and production personnel to comprehensively and accurately assess gas resources when conducting pressure-holding coring operations.

[0005] These problems severely limit the efficiency and quality of pressure-holding core sampling operations, causing numerous inconveniences to related scientific research and production work. Therefore, developing a pressure-holding core free gas collection device that can continuously collect free gas from pressure-holding cores on-site, accurately read the collected data, and conduct on-site ignition tests has become an urgent problem to be solved by those skilled in the art. Utility Model Content

[0006] In view of this, the present invention provides a pressure-maintaining core free gas collection device, which aims to solve the above-mentioned technical problems.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A pressure-maintaining core free gas collection device includes: a gas collection device support, and a gas collection cylinder assembly disposed on the gas collection device support; the gas collection cylinder assembly includes: a first gas collection cylinder and a second gas collection cylinder;

[0009] The first gas collecting cylinder is used to collect free gas. The top of the first gas collecting cylinder has a sampling ignition tube, and the bottom of the first gas collecting cylinder has an air inlet pipe and a connecting pipe.

[0010] The second gas collecting cylinder is used to receive water discharged from the first gas collecting cylinder. The top end of the second gas collecting cylinder is connected to the connecting pipe and has an exhaust pipe. The bottom end of the second gas collecting cylinder has a drain pipe.

[0011] A control switch assembly, comprising multiple quick-connect switches installed on various pipelines.

[0012] Through the above technical solution, this utility model achieves effective separation and collection of free gas and water by setting up a first gas collecting cylinder and a second gas collecting cylinder. The first gas collecting cylinder is specifically used to collect free gas, and its sampling ignition tube at the top facilitates sampling and ignition testing; the inlet pipe and connecting pipe at the bottom ensure that gas can smoothly enter and water can be discharged. The second gas collecting cylinder is used to receive water discharged from the first gas collecting cylinder, and its exhaust pipe at the top and drain pipe at the bottom allow for the discharge of water and gas. In addition, the setting of the control switch group allows for flexible control of the on / off of each pipeline, further improving the ease of operation and reliability of the device. This structural design not only meets the basic requirements for free gas collection from pressurized core samples, but also provides convenient conditions for subsequent gas analysis and research.

[0013] Preferably, in the above-mentioned pressure-maintaining core free gas collection device, the control switch group includes a first quick-connect switch installed on the air inlet pipe, a second quick-connect switch installed on the connecting pipe, a third quick-connect switch installed on the exhaust pipe, a fourth quick-connect switch installed on the drain pipe, and a fifth quick-connect switch installed on the sampling ignition pipe. By setting multiple quick-connect switches, the on / off state of each pipeline can be quickly controlled, improving the convenience and flexibility of operation and further improving work efficiency.

[0014] Preferably, in the above-mentioned pressure-maintaining core free gas collection device, a pressure-reducing valve is fixed on the gas collection device support. The pressure-reducing valve is used to connect the gas inlet pipe and the gas outlet of the pressure-maintaining core sampling device. The pressure-reducing valve enables the gas to enter the first gas collection cylinder at a constant pressure, ensuring the stability and accuracy of gas collection and improving the reliability of the collected data.

[0015] Preferably, in the above-mentioned pressure-maintaining core free gas collection device, both the first and second gas collecting cylinders are transparent cylinders. The transparent cylinder design allows the operator to directly observe the flow of gas and water as well as the volume of collected gas, facilitating real-time monitoring of the collection process and improving operational accuracy.

[0016] Preferably, in the above-mentioned pressure-maintaining core free gas collection device, the first gas collecting cylinder has a scale. The scale setting enables precise reading of the collected gas volume, providing accurate and reliable data for subsequent research and analysis.

[0017] Preferably, in the above-mentioned pressure-maintaining core free gas collection device, the air inlet pipe, the connecting pipe, the exhaust pipe, the drain pipe, and the sampling ignition pipe are all quick-connect pipes. The quick-connect pipe design makes the connection and disassembly of each pipe more convenient and quick, improving the efficiency and flexibility of operation.

[0018] Preferably, in the above-mentioned pressure-maintaining core free gas collection device, the gas collection device support includes a frame and a mounting plate, and the first gas collecting cylinder and the second gas collecting cylinder are fixed on the mounting plate. The gas collection device support can support the entire gas collection device and ensure the stability of the device. At the same time, the first gas collecting cylinder and the second gas collecting cylinder are fixed on the mounting plate, which further improves the stability and reliability of the device.

[0019] Preferably, in the above-mentioned pressure-maintaining core free gas collection device, the number of gas collecting cylinder groups is multiple. The multiple gas collecting cylinder groups enable continuous on-site collection of free gas from pressure-maintaining cores, improving operational efficiency. Furthermore, the multiple gas collecting cylinder groups can be used alternately, avoiding operational interruptions caused by stopping the machine after the gas collection is complete, further improving the continuity and efficiency of the operation.

[0020] As can be seen from the above technical solution, compared with the prior art, this utility model discloses a pressure-maintaining core free gas collection device, which has the following beneficial effects:

[0021] 1. Improve data accuracy: By using the first and second gas collecting cylinders together, the volume of the collected gas can be accurately read, providing accurate and reliable data for subsequent research and analysis.

[0022] 2. Achieve continuous operation: By using multiple sets of gas collecting cylinders alternately, after one set of gas collecting cylinders is full, it is possible to immediately switch to another set of gas collecting cylinders to continue collecting, thus realizing continuous on-site collection of free gas in pressure-maintaining rock cores and improving work efficiency.

[0023] 3. Meets multiple needs: It can not only continuously collect free gas, but also easily perform sampling and ignition tests, meeting the diverse needs of pressure-holding coring operations. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0025] Figure 1 The attached figure is a structural schematic diagram of the pressure-maintaining core free gas collection device provided by this utility model.

[0026] in:

[0027] 1-Gas collection device bracket; 2-First gas collection cylinder; 3-Second gas collection cylinder; 4-Sampling ignition pipe; 5-Inlet pipe; 6-Connecting pipe; 7-Exhaust pipe; 8-Drain pipe; 9-First quick-connect switch; 10-Second quick-connect switch; 11-Third quick-connect switch; 12-Fourth quick-connect switch; 13-Fifth quick-connect switch; 14-Pressure reducing valve; 15-Frame; 16-Mounting plate. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Example 1:

[0030] See appendix Figure 1 This utility model discloses a pressure-maintaining core free gas collection device, including: a gas collection device support 1, and a gas collection cylinder assembly disposed on the gas collection device support 1; the gas collection cylinder assembly includes: a first gas collection cylinder 2 and a second gas collection cylinder 3;

[0031] The first gas collecting cylinder 2 is used to collect free gas. The top of the first gas collecting cylinder 2 has a sampling ignition tube 4, and the bottom of the first gas collecting cylinder 2 has an air inlet tube 5 and a connecting tube 6.

[0032] The second gas collecting cylinder 3 is used to receive water discharged from the first gas collecting cylinder 2. The top end of the second gas collecting cylinder 3 is connected to the connecting pipe 6 and has an exhaust pipe 7. The bottom end of the second gas collecting cylinder 3 has a drain pipe 8.

[0033] The control switch assembly includes multiple quick-connect switches installed on various pipelines.

[0034] To further optimize the above technical solution, the control switch group includes a first quick-connect switch 9 installed on the intake pipe 5, a second quick-connect switch 10 installed on the connecting pipe 6, a third quick-connect switch 11 installed on the exhaust pipe 7, a fourth quick-connect switch 12 installed on the drain pipe 8, and a fifth quick-connect switch 13 installed on the sampling ignition pipe 4.

[0035] To further optimize the above technical solution, a pressure reducing valve 14 is fixed on the gas collecting device bracket 1. The pressure reducing valve 14 is used to connect the air inlet pipe 5 and the air outlet of the pressure holding and core sampling device.

[0036] To further optimize the above technical solution, both the first gas collecting cylinder 2 and the second gas collecting cylinder 3 are transparent cylinders.

[0037] To further optimize the above technical solution, the first gas collecting cylinder 2 and the second gas collecting cylinder 3 are equipped with graduations.

[0038] To further optimize the above technical solution, the intake pipe 5, connecting pipe 6, exhaust pipe 7, drain pipe 8, and sampling ignition pipe 4 are all quick-connect pipes.

[0039] To further optimize the above technical solution, the gas collection device support 1 includes a frame 15 and a mounting plate 16, and the first gas collection cylinder 2 and the second gas collection cylinder 3 are fixed on the mounting plate 16.

[0040] The specific operation method of this embodiment is as follows:

[0041] Step 1: Connect the water pump to the air inlet pipe 5 and fill the first air collection cylinder 2 with clean water.

[0042] Step 2: Remove the water pump, connect the air inlet pipe 5 to the air outlet of the pressure reducing valve 14, and connect the air inlet of the pressure reducing valve 14 to the air outlet of the pressure-holding core-taking device; close the first quick-connect switch 9 to the fifth quick-connect switch 13.

[0043] Step 3: Turn on the pressure-holding coring device to allow high-pressure gas to slowly enter the pressure reducing valve 14. Open the first quick-connect switch 9, the second quick-connect switch 10, and the third quick-connect switch 11. After passing through the pressure reducing valve 14, the high-pressure gas enters the first gas collecting cylinder 2 at a constant pressure. At the same time, the water in the first gas collecting cylinder 2 is drained into the second gas collecting cylinder 3. Observe the scale on the first gas collecting cylinder 2 to record the collected gas volume.

[0044] Step 4: If an ignition test is required, turn off the switch of the pressure-holding core-taking device, connect the water pump to the drain pipe 8, and turn off the first quick-connect switch 9 to the fifth quick-connect switch 13.

[0045] Step 5: Connect the water pump power supply, turn on the second quick-connect switch 10 and the fourth quick-connect switch 12, and at the same time bring the flame source close to the sampling ignition tube 4. Then turn on the fifth quick-connect switch 13 to complete the ignition experiment.

[0046] Step 6: If gas sampling is required, repeat step 4, connect the gas sampling bag to the sampling ignition tube 4, turn on the water pump power, and turn on the second quick-connect switch 10, the fourth quick-connect switch 12 and the fifth quick-connect switch 13 to meet the gas sampling requirements.

[0047] Example 2:

[0048] This embodiment is a further improvement on embodiment 1: the number of gas collecting cylinder groups is two.

[0049] The difference between the operation method of this embodiment and that of Embodiment 1 is as follows:

[0050] In step 1, the first gas collecting cylinder 2 of the two sets of gas collecting cylinders is filled with clean water. Then, steps 2 to 6 are the same.

[0051] It should be noted that in this embodiment, although there are two sets of gas collecting cylinders, steps 2 to 6 are still performed on one set. After the first gas collecting cylinder 2 of one set is full of gas, the switch of the pressure-holding coring device and the first quick-connect switch 9 are turned off. The air inlet of the pressure reducing valve 14 of the other set of gas collecting cylinders is connected to the air outlet of the pressure-holding coring device. Steps 2-6 are repeated. This process is repeated until the free body collection is complete.

[0052] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0053] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pressure-maintaining core free gas collection device, comprising: A gas collecting device support (1), and a gas collecting cylinder assembly disposed on the gas collecting device support (1); characterized in that the gas collecting cylinder assembly comprises: a first gas collecting cylinder (2) and a second gas collecting cylinder (3); The first gas collecting cylinder (2) is used to collect free gas. The top of the first gas collecting cylinder (2) has a sampling ignition tube (4), and the bottom of the first gas collecting cylinder (2) has an air inlet tube (5) and a connecting tube (6). The second gas collecting cylinder (3) is used to receive water discharged from the first gas collecting cylinder (2). The top end of the second gas collecting cylinder (3) is connected to the connecting pipe (6) and has an exhaust pipe (7). The bottom end of the second gas collecting cylinder (3) has a drain pipe (8). A control switch assembly, comprising multiple quick-connect switches installed on various pipelines.

2. The pressure-maintaining core free gas collection device according to claim 1, characterized in that, The control switch group includes a first quick-connect switch (9) installed on the intake pipe (5), a second quick-connect switch (10) installed on the connecting pipe (6), a third quick-connect switch (11) installed on the exhaust pipe (7), a fourth quick-connect switch (12) installed on the drain pipe (8), and a fifth quick-connect switch (13) installed on the sampling ignition pipe (4).

3. The pressure-maintaining core free gas collection device according to claim 1, characterized in that, A pressure reducing valve (14) is fixed on the gas collecting device bracket (1). The pressure reducing valve (14) is used to connect the air inlet pipe (5) and the air outlet of the pressure-holding core collecting device.

4. The pressure-maintaining core free gas collection device according to claim 1, characterized in that, Both the first gas collecting cylinder (2) and the second gas collecting cylinder (3) are transparent cylinders.

5. The pressure-maintaining core free gas collection device according to claim 1, characterized in that, The first gas collecting cylinder (2) and the second gas collecting cylinder (3) have scales.

6. The pressure-maintaining core free gas collection device according to claim 1, characterized in that, The intake pipe (5), the connecting pipe (6), the exhaust pipe (7), the drain pipe (8), and the sampling ignition pipe (4) are all quick-connect pipes.

7. The pressure-maintaining core free gas collection device according to claim 1, characterized in that, The gas collection device bracket (1) includes a frame (15) and a mounting plate (16), and the first gas collection cylinder (2) and the second gas collection cylinder (3) are fixed on the mounting plate (16).

8. The pressure-maintaining core free gas collection device according to claim 1, characterized in that, The number of gas collecting cylinder groups is multiple.