Special degasser for helium logging

Abstract

The utility model relates to the field of petroleum and natural gas exploration technology, especially helium logging special degassing device, including degassing tank, connecting frame and stirring subassembly, the upper end of degassing tank is connected with exhaust connection pipe, a plurality of connecting frames are fixedly installed in the inside of degassing tank, a plurality of connecting frames are evenly arranged in linear up and down, the inside of every connecting frame is fixedly installed with a set of degassing disc, and the diameter of multiple sets of degassing discs increases gradually from top to bottom, and the filling assembly is arranged at the upper end of the degassing tank, and the stirring assembly is arranged at the periphery of the degassing disc, the utility model adds drilling fluid sample on the uppermost degassing disc in the degassing tank through the filling assembly, forms thin layer liquid film and expands to the edge after stirring subassembly is actuated, after reaching the edge, liquid film freely falls on the next layer bigger degassing disc, and repeats many times, and the violent pressure disturbance and collision effect produced in every stage falling process, significantly promote the desorption and release process of helium from drilling fluid, form stable helium gas source.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas exploration technology, and in particular to a degassing device for helium logging. Background Technology

[0002] The degasser is one of the core pieces of equipment in geological logging operations. Its main function is to release the dissolved and adsorbed gases contained in the drilling fluid through physical means and transport them to the gas analysis system. By analyzing the composition and content of these gases, the properties of underground formation fluids can be effectively assessed, providing key evidence for the discovery and evaluation of oil and gas reservoirs.

[0003] As an important strategic resource and indicator gas for oil and gas reservoirs, the demand for accurate detection of helium is becoming increasingly prominent. When traditional degassing devices collect helium, due to the extremely small molecular weight of helium, its low solubility in drilling fluid, and its unique analytical kinetics, the traditional single and violent stirring degassing mode is inefficient and easily causes uneven gas mixing or pulsed gas flow, which cannot provide a stable and continuous gas source for high-precision helium analysis.

[0004] Therefore, to address the aforementioned issues, a dedicated degassing device for helium logging can be designed. The degassing tank features a unique stepped design with multiple sets of degassing discs. These discs are fixed in concentric circles with progressively larger diameters from top to bottom. The drilling fluid is guided to the center of the uppermost degassing disc, forming a thin liquid film that extends towards the edge. Upon reaching the edge, the liquid film falls freely onto the next, larger degassing disc, repeating this process multiple times. The intense pressure disturbances and collision effects generated during each fall significantly promote the desorption and release of low-solubility helium from the drilling fluid, ultimately resulting in a stable and continuous helium supply. Utility Model Content

[0005] To overcome the problems of traditional degassing devices when collecting helium, which suffer from the extremely small molecular weight of helium, low solubility of helium in drilling fluid, and unique analytical kinetics, the traditional single and violent stirring degassing mode is inefficient and prone to uneven gas mixing or pulsed gas flow, thus failing to provide a stable and continuous gas source for high-precision helium analysis.

[0006] The technical solution of this utility model is as follows: a degassing device for helium logging, comprising a degassing tank, connecting frames, a filling assembly, a buffer assembly, and a stirring assembly. An exhaust pipe is connected to the upper end of the degassing tank, and a connecting pipe is connected to the lower end of the degassing tank. Several connecting frames are fixedly installed inside the degassing tank and are evenly arranged vertically. Each set of connecting frames has a set of degassing discs fixedly installed inside. The diameter of the multiple sets of degassing discs increases progressively from top to bottom. The filling assembly is located at the upper end of the degassing tank, the buffer assembly is located below the connecting pipe, and the stirring assembly is located around the degassing discs.

[0007] Preferably, multiple degassing discs are fixedly installed inside the degassing tank by a connecting frame. A filling component allows drilling fluid samples to be added to the uppermost degassing disc inside the degassing tank. After being stirred by a stirring component, a thin liquid film is formed and extends towards the edge. Upon reaching the edge, the liquid film falls freely onto the next larger degassing disc, and this process is repeated multiple times. The intense pressure disturbance and collision effect generated during each fall significantly promotes the desorption and release of low-solubility helium from the drilling fluid, ultimately forming a stable and continuous helium gas source. The helium is then transported to an external gas analysis system for analysis through an exhaust pipe. The degassed drilling fluid sample is temporarily stored inside a buffer component through a connecting pipe to prevent direct discharge from external gas from diluting the gas sample inside the degassing tank.

[0008] Preferably, the filling assembly includes a filling connector and a diversion pipe, with the multi-component diversion pipes connected to the upper end of the degassing tank and the filling connector connected to the upper end of the diversion pipes.

[0009] Preferably, the buffer assembly includes a buffer box that extends through and is connected to the lower end of the connecting pipe, with the bottom surface of the inner cavity of the buffer box being inclined.

[0010] Preferably, the buffer assembly includes a drain pipe and a valve, with the drain pipe connected through one side of the buffer tank and a valve at one end of the drain pipe.

[0011] Preferably, the stirring assembly includes a drive motor and a coupler. The coupler is fixedly installed at the lower end of the degassing tank, and the drive motor is fixedly installed below the degassing tank. The output end of the drive motor is connected to the coupler.

[0012] Preferably, the stirring assembly includes a stirring shaft and stirring blades. The stirring shaft is rotatably connected to the inside of the degassing tank and is connected to a coupler. Multiple sets of stirring blades are fixedly installed on the periphery of the stirring shaft, and the multiple sets of stirring blades respectively contact the upper surface of multiple sets of degassing discs.

[0013] Preferably, the degassing tank is surrounded by an electric heating jacket.

[0014] The beneficial effects of this utility model are: The external drilling fluid sample supply equipment is connected via a filling pipe. The supplied sample fluid is evenly injected into the degassing plate at the top of the degassing tank through a diversion pipe. The stirring shaft is driven by a motor and a coupler to rotate, thereby agitating the drilling fluid on the degassing plate to form a thin liquid film that extends to the edge. After reaching the edge, the liquid film falls freely onto the next larger degassing plate, and this process is repeated multiple times. The intense pressure disturbance and collision effect generated during each fall process can significantly promote the desorption and release of low-solubility helium from the drilling fluid, ultimately forming a stable and continuous helium gas source. Attached Figure Description

[0015] Figure 1 The diagram shown is a first three-dimensional structural schematic of the helium logging degassing device of this utility model. Figure 2 The diagram shown is a second three-dimensional structural schematic of the helium logging degassing device of this utility model. Figure 3 The diagram shown is a three-dimensional cross-sectional view of the helium logging degassing device of this utility model. Figure 4 The diagram shown is a three-dimensional cross-sectional view of the buffer box of the helium logging degassing device of this utility model. Explanation of reference numerals in the attached drawings: 1. Degassing tank; 101. Exhaust pipe; 102. Connecting pipe; 2. Connecting frame; 201. Degassing disc; 301. Filling pipe; 302. Diversion pipe; 401. Buffer tank; 402. Drain pipe; 403. Valve; 501. Drive motor; 502. Coupler; 503. Stirring shaft; 504. Stirring blade; 6. Electric heating jacket. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Please see Figure 1 and Figure 3 This utility model provides an embodiment of a helium logging-specific degassing device, comprising a degassing tank 1, connecting frames 2, a filling assembly, a buffer assembly, and a stirring assembly. An exhaust pipe 101 is connected to the upper end of the degassing tank 1, and a connecting pipe 102 is connected to the lower end of the degassing tank 1. Several connecting frames 2 are fixedly installed inside the degassing tank 1, arranged linearly vertically. Each set of connecting frames 2 has a set of degassing discs 201 fixedly installed inside. The diameter of the multiple sets of degassing discs 201 increases progressively from top to bottom. The filling assembly is located at the upper end of the degassing tank 1, the buffer assembly is located below the connecting pipe 102, and the stirring assembly is located around the degassing discs 201. The multiple sets of degassing discs 201 are fixedly installed on the degassing tank 1 by the connecting frames 2. Inside the gas tank 1, a filling component allows drilling fluid samples to be added to the uppermost degassing plate 201. After being stirred by the stirring component, a thin liquid film is formed and extends towards the edge. Once it reaches the edge, the liquid film falls freely onto the next larger degassing plate 201, and this process is repeated multiple times. The intense pressure disturbance and collision effect generated during each fall significantly promotes the desorption and release of low-solubility helium from the drilling fluid, ultimately forming a stable and continuous helium source. The helium is then transported to an external gas analysis system for analysis through the exhaust pipe 101. The degassed drilling fluid sample is temporarily stored inside the buffer component through the connecting pipe 102 to prevent direct discharge from external gas from entering the degassing tank 1 and diluting the gas sample.

[0018] Please see Figure 1and Figure 4 In this embodiment, the filling component includes a filling connector 301 and a diversion pipe 302. The multi-component diversion pipe 302 is connected to the upper end of the degassing tank 1, and the filling connector 301 is connected to the upper end of the diversion pipe 302. By setting the filling connector 301 to connect to an external drilling fluid sample supply device, the supplied sample fluid is evenly filled into the degassing plate 201 at the uppermost end of the degassing tank 1 through the diversion pipe 302. The buffer component includes a buffer tank 401 connected to the lower end of the connecting pipe 102. The bottom surface of the inner cavity is inclined. The buffer assembly includes a drain pipe 402 and a valve 403. The drain pipe 402 is connected through one side of the buffer tank 401, and a valve 403 is provided at one end of the drain pipe 402. By setting up the buffer tank 401, the degassed drilling fluid can be temporarily stored to prevent direct discharge from causing external gas to enter the degassed tank 1 and dilute the gas sample. After the extraction work is completed, the temporarily stored drilling fluid is discharged through the drain pipe 402 under the guidance of the inclined bottom surface of the inner cavity of the buffer tank 401 by opening the valve 403.

[0019] Please see Figure 2 and Figure 3 In this embodiment, the stirring assembly includes a drive motor 501 and a coupler 502. The coupler 502 is fixedly installed at the lower end of the degassing tank 1, and the drive motor 501 is fixedly installed below the degassing tank 1. The output end of the drive motor 501 is connected to the coupler 502. The stirring assembly includes a stirring shaft 503 and stirring blades 504. The stirring shaft 503 is rotatably connected to the inside of the degassing tank 1 and is connected to the coupler 502. Multiple sets of stirring blades 504 are fixedly installed around the stirring shaft 503, and the multiple sets of stirring blades 504 are respectively connected to the upper surface of multiple sets of degassing discs 201. Surface contact; by setting the drive motor 501 to drive the stirring shaft 503 to rotate through the coupler 502, the drilling fluid above the degassing plate 201 can be stirred by the stirring blades 504 to form a thin liquid film and extend to the edge. By setting the coupler 502 to connect the output end of the drive motor 501 to the stirring shaft 503, the sealing of the degassing tank 1 can be ensured. An electric heating sleeve 6 is set around the degassing tank 1. By setting the electric heating sleeve 6, the inside of the degassing tank 1 can be heated to optimize the gas separation effect, while ensuring that the heating process is uniform and stable, and avoiding local overheating that affects the reliability of the equipment.

[0020] When working, first close valve 403, then connect to the external gas analysis system through exhaust pipe 101, and start electric heating jacket 6 to heat the inside of degassing tank 1 to assist helium gas removal. Connect external drilling fluid sample supply equipment through injection pipe 301, and the supplied sample liquid is evenly injected into the degassing plate 201 at the top of the inside of degassing tank 1 through diversion pipe 302. The motor drives the stirring shaft 503 to rotate through the coupler 502, thereby agitating the drilling fluid on the degassing plate 201 to form a thin liquid film that extends to the edge. After reaching the edge, the liquid film falls freely onto the next larger degassing plate 201, and this process is repeated multiple times. The intense pressure disturbance and collision effect generated during each fall process can significantly promote the desorption and release of low-solubility helium from the drilling fluid, ultimately forming a stable and continuous helium gas source. Helium is delivered to an external gas analysis system for analysis through exhaust pipe 101. The degassed drilling fluid sample is temporarily stored in buffer tank 401 through connecting pipe 102 to prevent external gas from entering the degassed tank 1 and diluting the gas sample if it is discharged directly. After the extraction is completed, the temporarily stored drilling fluid is discharged through drain pipe 402 under the guidance of the inclined surface at the bottom of the inner cavity of buffer tank 401 by opening valve 403.

[0021] Through the above steps, drilling fluid samples are added to the uppermost degassing plate 201 inside the degassing tank 1 via the injection component. After being stirred by the stirring component, a thin liquid film is formed and extends towards the edge. Upon reaching the edge, the liquid film falls freely onto the next larger degassing plate 201, and this process is repeated multiple times. The intense pressure disturbance and collision effect generated during each fall significantly promotes the desorption and release of helium from the drilling fluid, forming a stable helium gas source. This solves the problem that traditional degassing devices, when collecting helium, suffer from low efficiency due to the extremely small molecular weight of helium, its low solubility in drilling fluid, and its unique analytical kinetics. The traditional single and intense stirring degassing mode is inefficient and prone to causing uneven gas mixing or pulsed gas flow, making it impossible to provide a stable and continuous gas source for high-precision helium analysis.

[0022] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A degassing device for helium logging, comprising a degassing tank (1), characterized in that: It also includes a connecting frame (2), a filling component, a buffer component and a stirring component. The upper end of the degassing tank (1) is connected to an exhaust pipe (101), and the lower end of the degassing tank (1) is connected to a connecting pipe (102). Several connecting frames (2) are fixedly installed inside the degassing tank (1). Several connecting frames (2) are evenly arranged vertically. Each set of connecting frames (2) has a set of degassing discs (201) fixedly installed inside. The diameter of the multiple sets of degassing discs (201) increases from top to bottom. The filling component is set at the upper end of the degassing tank (1), the buffer component is set below the connecting pipe (102), and the stirring component is set around the degassing discs (201).

2. The helium logging degassing device according to claim 1, characterized in that: The filling assembly includes a filling pipe (301) and a diversion pipe (302). The multi-component diversion pipe (302) is connected to the upper end of the degassing tank (1), and the filling pipe (301) is connected to the upper end of the diversion pipe (302).

3. The helium logging degassing device according to claim 1, characterized in that: The buffer assembly includes a buffer box (401) that is connected to the lower end of the connecting pipe (102), and the bottom surface of the inner cavity of the buffer box (401) is inclined.

4. The helium logging degassing device according to claim 3, characterized in that: The buffer assembly includes a drain pipe (402) and a valve (403). The drain pipe (402) is connected through one side of the buffer tank (401), and a valve (403) is provided at one end of the drain pipe (402).

5. The helium logging degassing device according to claim 1, characterized in that: The stirring assembly includes a drive motor (501) and a coupler (502). The coupler (502) is fixedly installed at the lower end of the degassing tank (1), and the drive motor (501) is fixedly installed below the degassing tank (1). The output end of the drive motor (501) is connected to the coupler (502).

6. The helium logging degassing device according to claim 5, characterized in that: The stirring assembly includes a stirring shaft (503) and stirring blades (504). The stirring shaft (503) is rotatably connected to the inside of the degassing tank (1). The stirring shaft (503) is connected to a coupler (502). Multiple sets of stirring blades (504) are fixedly installed on the periphery of the stirring shaft (503). The multiple sets of stirring blades (504) respectively contact the upper surface of multiple sets of degassing discs (201).

7. The helium logging degassing device according to claim 1, characterized in that: An electric heating jacket (6) is fitted around the degassing tank (1).

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