Coalbed gas electronic pressure gauge

Abstract

The utility model discloses an electronic pressure gauge for coal bed gas. The pressure gauge comprises a functional unit and a protective shell arranged outside the functional unit, the functional unit is used for positioning the pressure gauge, acquiring and processing pressure information and fixing the pressure gauge; the protection shells of the function units are in interlocking connection, sealing pieces are arranged at the interlocking connection positions respectively, and sealing assemblies are arranged outside the protection shells of the function units related to the circuit. The sealing assembly is wrapped in a protective housing of a functional unit related to the circuit device. The protection shells of the function units are sequentially connected in an interlocking mode to form mechanical interlocking, sealing failure caused by structure loosening and falling is avoided, sealing pieces are arranged at the interlocking connecting positions respectively for sealing the connecting positions, the protection shells related to circuits are wrapped with sealing assemblies, and therefore the sealing effect is improved. Therefore, collaborative protection of a multi-layer sealing and interlocking structure is formed, and the problem that in the prior art, an electronic pressure gauge is prone to sealing failure in a coal bed gas well is solved.

Description

Technical Field

[0001] This utility model relates to the field of electronic pressure gauges for coalbed methane wells, specifically to an electronic pressure gauge for coalbed methane. Background Technology

[0002] Coalbed methane (CBM), as an important unconventional natural gas resource, has its extraction efficiency directly impacting the optimization of the energy structure and the improvement of development benefits. Downhole pressure monitoring is a core component of CBM reservoir dynamic analysis, reflecting real-time changes in the reservoir and helping engineers gain a deeper understanding of CBM seepage patterns, reservoir pressure distribution, and reservoir depletion characteristics. This information plays a decisive role in scientifically formulating extraction plans, optimizing well network layout, rationally adjusting extraction parameters, and improving CBM recovery rates. However, existing electronic pressure gauges have significant drawbacks in practical applications in CBM wells: the high temperature and high pressure conditions in CBM wells mean that the sealing structure of existing pressure gauges is prone to thermal degradation and structural loosening under high temperatures (>200℃) and high pressure, leading to seal failure and a significant reduction in equipment lifespan. Utility Model Content

[0003] This application provides a coalbed methane electronic pressure gauge to solve the problem of sealing failure in existing electronic pressure gauges under high temperature and high pressure conditions in coalbed methane wells. The specific solution is as follows:

[0004] A coalbed methane electronic pressure gauge, the pressure gauge comprising a functional unit and a protective housing disposed outside the functional unit;

[0005] The functional unit is used to locate the pressure gauge, collect and process pressure information, and fix the pressure gauge.

[0006] The protective housings of the functional units are interlocked, and the protective housings of the functional units are respectively provided with seals at the interlocking connection points. Furthermore, the protective housings of the functional units involving the circuit are provided with sealing components on the outside.

[0007] The sealing assembly is encased in a protective housing of the functional unit involving the circuitry.

[0008] Preferably, the protective housing of the functional unit includes a protective housing for the acquisition unit, a protective housing for the processing and storage unit, and a protective housing for the power supply, arranged sequentially along the direction from the positioning direction to the downward direction.

[0009] The protective housing of the acquisition unit, the protective housing of the processing and storage unit, and the protective housing of the power supply are sequentially interlocked.

[0010] The protective housing of the acquisition unit and the protective housing of the processing and storage unit are provided with sealing components on their outer sides.

[0011] The sealing components respectively enclose the protective housing of the acquisition unit and the protective housing of the processing and storage unit.

[0012] Preferably, the sealing assembly includes a sealing housing and a sealing adhesive layer;

[0013] The sealant layers are respectively located on the sealed housing and the protective shell of the processing and storage unit, as well as the sealed housing.

[0014] Between the body and the protective shell of the acquisition unit;

[0015] The sealant layer connects the sealing housing, the protective housing of the processing and storage unit, and the protective housing of the acquisition unit, respectively.

[0016] Preferably, the sealant layer is filled with a high-temperature resistant sealant, wherein the high-temperature resistant temperature is at least 248°C.

[0017] Preferably, the functional unit includes a positioning unit, a data acquisition unit, a processing and storage unit, a power supply, and a data transfer unit arranged sequentially along the test direction;

[0018] The acquisition unit, the processing and storage unit, and the power supply are respectively located inside the protective housing of the acquisition unit, the protective housing of the processing and storage unit, and the protective housing of the power supply.

[0019] One end of the positioning unit faces the measurement position, and the other end of the positioning unit faces the protective housing of the acquisition unit;

[0020] The processing and storage unit is connected to the acquisition unit and the power supply, respectively.

[0021] The acquisition unit collects downhole pressure in real time and transmits the collected pressure data to the processing and storage unit. The acquisition unit and the processing and storage unit are equipped with sealing components on their exteriors.

[0022] The lowering unit uses external force to lower the entire pressure gauge to the designated position in the coalbed methane well. The lowering unit is connected to the end of the power supply's protective housing that faces away from the protective housing of the processing and storage unit.

[0023] The sealing assembly is connected at both ends to the outer sides of the positioning unit and the lowering unit, respectively.

[0024] Preferably, a sealing plug is provided between the acquisition unit and the positioning unit; the acquisition unit and the protective housing of the acquisition unit are connected by laser welding.

[0025] Preferably, the acquisition unit is a pressure sensor.

[0026] Preferably, the positioning unit has an overall cone-shaped structure, with the cone point facing the position to be measured and connected to the outside.

[0027] Preferably, the lowering unit is any one of plate-shaped, ring-shaped, and strip-shaped connectors.

[0028] Compared with the prior art, the beneficial effects of this application are as follows:

[0029] In this application, the protective housings of the functional units are sequentially interlocked, forming a mechanical interlock to prevent sealing failure due to structural loosening and detachment. Seals are installed at the interlocking connections to seal the joints. A sealing assembly is wrapped around the protective housing involving the circuitry to further improve its sealing performance, thus forming a multi-layered sealing and interlocking structure for synergistic protection. The sealing assembly includes a sealing housing and a sealing adhesive layer, effectively isolating high-temperature (≥248℃), high-pressure, and corrosive media intrusion, solving the high-temperature failure problem of traditional sealing structures. This addresses the issue of sealing failure of electronic pressure gauges in the complex environment of coalbed methane wells, as described in the prior art. Attached Figure Description

[0030] Figure 1 This is a cross-sectional structural schematic diagram of a coalbed methane electronic pressure gauge in an embodiment of this application;

[0031] In the diagram: 1. Lowering unit; 2. Protective housing of the power supply; 3. Sealed outer cylinder; 4. Protective housing of the processing and storage unit; 5. Protective housing of the acquisition unit; 6. Positioning unit; 7. Sealing plug; 8. First sealing ring; 9. Power supply; 10. Second sealing ring; 11. Socket; 12. Third sealing ring; 13. Processing and storage unit; 14. Fourth sealing ring; 15. Sealing adhesive layer; 16. Acquisition unit; 17. Fifth sealing ring; 18. Sixth sealing ring. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Please see Figure 1 This utility model provides a coalbed methane electronic pressure gauge, which includes a functional unit and a protective housing disposed outside the functional unit;

[0034] The functional unit is used to locate the pressure gauge, collect and process pressure information, and fix the pressure gauge.

[0035] The protective housings of the functional units are interlocked, and the protective housings of the functional units are respectively provided with seals at the interlocking connection points. Furthermore, the protective housings of the functional units involving the circuit are provided with sealing components on the outside.

[0036] The sealing assembly is encased in a protective housing of the functional unit involving the circuitry.

[0037] It should be noted that:

[0038] In this application, the pressure gauge mainly consists of two parts: a functional unit and a protective housing.

[0039] The functional unit, as the core component for the pressure gauge to perform various functions, is mainly used to locate the pressure gauge itself, collect pressure data of the gas pressure in the coal seam where the pressure gauge is located, and stably fix the pressure gauge at the position where the required pressure is measured to ensure the accuracy and stability of the measurement. The protective shell is installed outside the corresponding functional unit to protect the functional unit.

[0040] The protective housings are sequentially interlocked along the test direction. This interlocking connection ensures a tight connection between the housings, enhancing the overall structural stability and preventing loosening or separation during use. Seals are installed at each interlocking connection point to prevent external liquids, gases, dust, or other impurities from entering the housing, thus protecting the functional units from environmental influences.

[0041] Meanwhile, for functional units involving circuitry, a sealing component is provided on the outside of their corresponding protective housing, and this sealing component encloses the protective housing of the functional unit involving the circuitry. This is because circuits and circuitry components have high environmental requirements, and the sealing component can further enhance the protective effect, prevent moisture and humidity from entering, avoid short circuits or damage to circuit components, and ensure the normal operation and service life of the pressure gauge.

[0042] Furthermore, the protective housing of the functional unit includes a protective housing 5 for the acquisition unit, a protective housing 4 for the processing and storage unit, and a protective housing 2 for the power supply, arranged sequentially along the direction from the positioning direction to the downward direction.

[0043] The positioning unit 6, the protective housing 5 of the acquisition unit, the protective housing 4 of the processing and storage unit, the protective housing 2 of the power supply, and the lower unit are interlocked and connected respectively.

[0044] The protective housing of the acquisition unit and the protective housing of the processing and storage unit are provided with sealing components on their outer sides.

[0045] The sealing components respectively enclose the protective housing of the acquisition unit and the protective housing of the processing and storage unit.

[0046] It should be noted that:

[0047] In this application, the protective housings of the aforementioned functional units of the circuit include the protective housing 5 of the acquisition unit and the protective housing 4 of the processing and storage unit.

[0048] In this configuration, one end of the lowering unit 1 is sleeved on the outside of the protective housing 2 of the power supply, the other end of the protective housing 2 of the power supply is sleeved on the outside of the protective housing 4 of the processing and storage unit, the other end of the protective housing 4 of the processing and storage unit is sleeved on the outside of the protective housing 5 of the acquisition unit, and a sealing plug 7 is provided between the other end of the protective housing 5 of the acquisition unit and the positioning unit 6, with the two ends of the sealing plug 7 pressing against the other end of the protective housing 5 of the acquisition unit and the positioning unit 6 respectively.

[0049] Furthermore, each of the above-mentioned components is equipped with a sealing element at its connection point; the sealing element is a sealing ring, which includes a first sealing ring 8, a second sealing ring 10, a third sealing ring 12, a fourth sealing ring 14, a fifth sealing ring 17, and a sixth sealing ring 18; wherein, the first sealing ring 8 is installed at the connection point between the lowering unit 1 and the protective housing 2 of the power supply; the second sealing ring 10 is installed at the connection point between the protective housing 2 of the power supply and the protective housing 4 of the processing and storage unit; the third sealing ring 12 is installed at the connection point between the protective housing 4 of the processing and storage unit and the protective housing 2 of the power supply; the fourth sealing ring 14 is installed at the connection point between the protective housing 4 of the processing and storage unit and the protective housing 5 of the acquisition unit; the fifth sealing ring 17 is installed at the connection point between the sealing plug 7 and the sealing outer cylinder 3; and the sixth sealing ring 18 is installed at the connection point between the sealing outer cylinder 3 and the positioning unit 6.

[0050] The sealing assembly is wrapped around the acquisition unit 16, the protective housing and the protective housing 4 of the processing and storage unit. One end of the sealing assembly is attached to the outside of the protective housing 2 of the power supply facing the protective housing 4 of the processing and storage unit, and the other end of the sealing assembly is attached to the outside of the positioning unit 6 facing the acquisition unit.

[0051] Furthermore, the sealing assembly includes a sealing housing and a sealing adhesive layer 15;

[0052] The sealant layers are located on the sealing housing and the protective housing of the processing and storage unit, respectively, and on the sealant...

[0053] Between the housing and the protective shell of the acquisition unit;

[0054] The sealant layer connects the sealing housing, the protective housing of the processing and storage unit, and the protective housing of the acquisition unit, respectively.

[0055] It should be noted that:

[0056] In this application, the sealing shell can be a hollow shell with a square or circular cross-section. In one embodiment of the application, in order to adapt to the shape of the protective shell 5 of the acquisition unit, the protective shell 4 of the processing and storage unit, the protective shell 2 of the power supply, and the positioning unit, the sealing shell is cylindrical, namely the sealing outer cylinder 3. The sealing outer cylinder 3 is sleeved on the sealing plug 7, and on the protective shell 5 of the acquisition unit and the protective shell 4 of the processing and storage unit. One end of the sealing outer cylinder 3 overlaps the end of the protective shell 2 of the power supply facing the protective shell 4 of the processing and storage unit, and the other end of the sealing outer cylinder 3 overlaps the positioning unit.

[0057] Furthermore, the sealant layer 15 is filled with a high-temperature resistant sealant, wherein the high-temperature resistant temperature is at least 248°C.

[0058] It should be noted that in this application, the sealant layer 15 is formed by injected high-temperature resistant sealant. During installation, diisooctyl sebate is injected between the protective housing and the cylindrical sealing housing of the processing and storage unit 13 to form the sealant layer. The boiling point of diisooctyl sebate is 248°C, which can fully meet the sealing performance requirements in high-temperature wells.

[0059] Furthermore, the functional unit includes a positioning unit 6, an acquisition unit 16, a processing and storage unit 13, a power supply 9, and a drop-down unit 1 arranged sequentially along the test direction;

[0060] The acquisition unit 16, the processing and storage unit 13, and the power supply 9 are respectively located inside the protective housing 5 of the acquisition unit, the protective housing 4 of the processing and storage unit, and the protective housing 2 of the power supply.

[0061] One end of the positioning unit 6 faces the measurement position, and the other end of the positioning unit 6 faces the protective housing of the acquisition unit;

[0062] The processing and storage unit 13 is connected to the acquisition unit 16 and the power supply 9, respectively.

[0063] The acquisition unit 16 acquires the downhole pressure in real time and transmits the acquired pressure data to the processing and storage unit 13. The acquisition unit 16 and the processing and storage unit 13 are equipped with sealing components on their exterior.

[0064] The lowering unit 1 uses external force to lower the entire pressure gauge to the designated position in the coalbed methane well. The lowering unit is connected to the end of the protective housing of the power supply that faces away from the protective housing of the processing and storage unit.

[0065] The sealing assembly (specifically the sealing housing) is connected at both ends to the outer sides of the positioning unit 6 and the lowering unit 1, respectively.

[0066] It should be noted that:

[0067] In this application, the lowering unit 1 is the pressure gauge top (starting end) unit, which is used to connect steel wire or rope to lower the pressure gauge to a designated position in the coalbed methane well, and serves to suspend and fix it.

[0068] The power supply 9 continuously supplies power to the pressure gauge, ensuring that the data acquisition unit 16 and the processing and storage unit 13 operate stably downhole for a long time. In one embodiment of this application, the power supply 9 is a battery pack.

[0069] The acquisition end of the acquisition unit 16 faces the positioning unit 6 and comes into contact with the gas inside the protective housing of the positioning unit 6. It receives the gas signal from the coal seam in the underground environment and transmits the signal to the processing and storage unit 13 for processing.

[0070] The processing and storage unit 13 is the main control circuit board, which is electrically connected to the power supply 9 and the acquisition unit 16 respectively. It is responsible for processing the pressure data acquired by the acquisition unit 16 and completing signal conversion, storage and control functions. The main control circuit board and the battery pack are connected through the socket 11 between them.

[0071] Positioning unit 6 is the bottom (end) unit of the pressure gauge, which positions and lowers the pressure gauge to the target measurement position.

[0072] Furthermore, a sealing plug 7 is provided between the acquisition unit 16 and the positioning unit 6; the acquisition unit and the protective shell of the acquisition unit are connected by laser welding.

[0073] Furthermore, the acquisition unit 16 is a pressure sensor.

[0074] It should be noted that:

[0075] In this application, the acquisition end of the pressure sensor faces the positioning unit 6, and the sensor connector of the pressure sensor faces the main control circuit board and is connected to the main control circuit board.

[0076] Furthermore, the positioning unit 6 has an overall cone-shaped structure, with the cone point facing the position to be measured and connected to the outside.

[0077] It should be noted that:

[0078] In this application, the positioning unit 6 is a lower cone head, which can reduce the fluid resistance in the well during lowering, allowing the pressure gauge to reach the target measurement position more smoothly.

[0079] Furthermore, the lowering unit 1 can be any one of plate-shaped, ring-shaped, and strip-shaped connectors;

[0080] In one embodiment of this application, the lowering unit 1 is a rope cap to facilitate the fixing of steel wire or rope.

Claims

1. A coal bed methane electronic pressure gauge characterized by, The pressure gauge comprises a functional unit and a protective shell arranged outside the functional unit; The functional unit is used to realize positioning of the pressure gauge, acquisition and processing of pressure information, and fixation of the pressure gauge; The protective shells of the functional units are interconnected, and the protective shells of the functional units are respectively provided with sealing members at the interlocking connections, and the protective shell of the functional unit involving the circuit is externally provided with a sealing assembly; The sealing assembly is wrapped outside the protective shell of the functional unit involving the circuit.

2. A coal bed gas electronic pressure gauge according to claim 1, wherein, The protective shells of the functional units comprise, in sequence from the positioning direction to the lowering direction, a protective shell of an acquisition unit, a protective shell of a processing and storage unit, and a protective shell of a power supply; The protective shells of the acquisition unit, the processing and storage unit, and the power supply are sequentially interconnected; The outer sides of the protective shell of the acquisition unit and the protective shell of the processing and storage unit are provided with a sealing assembly; The sealing assembly is respectively wrapped in the protective shell of the acquisition unit and the protective shell of the processing and storage unit.

3. A coal bed gas electronic pressure gauge according to claim 2, wherein, The sealing assembly comprises a sealing shell and a sealing adhesive layer; The sealing adhesive layer is respectively located between the sealing shell and the protective shell of the processing and storage unit, and between the sealing shell and the protective shell of the acquisition unit; The sealing adhesive layer respectively connects the sealing shell and the protective shell of the processing and storage unit and the protective shell of the acquisition unit. The sealing adhesive layer is filled with a high-temperature-resistant sealing adhesive, wherein the high-temperature-resistant temperature is at least 248℃.

4. A coal bed gas electronic pressure gauge according to claim 3, wherein, The functional unit comprises, in sequence along a test direction, a positioning unit, an acquisition unit, a processing and storage unit, a power supply, and a lowering unit; 5. A coal bed gas electronic pressure gauge according to claim 2, wherein, The acquisition unit, the processing and storage unit, and the power supply are respectively located in the protective shell of the acquisition unit, the protective shell of the processing and storage unit, and the protective shell of the power supply; One end of the positioning unit faces a measurement position, and the other end of the positioning unit faces the protective shell of the acquisition unit; The processing and storage unit is respectively connected to the acquisition unit and the power supply; The acquisition unit acquires pressure in real time and transmits the acquired pressure data to the processing and storage unit, and the acquisition unit and the processing and storage unit are externally provided with a sealing assembly; The lowering unit lowers the entire pressure gauge to a designated position of the coalbed methane well by external force, and the lowering unit is connected to one end of the protective shell of the power supply which is away from the protective shell of the processing and storage unit; The sealing assembly is respectively connected to the outer sides of the positioning unit and the lowering unit. A sealing plug is arranged between the acquisition unit and the positioning unit, and the acquisition unit and the protective shell of the acquisition unit are connected by laser welding.

6. A coal bed gas electronic pressure gauge according to claim 5, wherein, The acquisition unit is a pressure sensor.

7. A coal bed gas electronic pressure gauge according to claim 5, wherein, The positioning unit has a whole conical structure, wherein a conical point faces a to-be-measured position and is in communication with the outside.

8. A coal bed gas electronic pressure gauge according to claim 5, wherein, The lowering unit is any one of a plate-shaped, ring-shaped, and strip-shaped connector.

9. A coal bed gas electronic pressure gauge according to claim 5, wherein, ​

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