Gas-liquid separation device and separation method thereof

Abstract

The invention discloses a gas-liquid separation device and a separation method thereof, which relates to the field of oil and natural gas exploitation. The gas-liquid separation device comprises: a tank body, a liquid discharge port is arranged at the lower end of the tank body, and a gas outlet port is arranged at the upper end of the tank body; a liquid inlet pipe extending into the tank body; an infrared transmitter arranged on the liquid inlet pipe, and the infrared transmitter is used to heat the gas in the gas-liquid mixed liquid flowing through the liquid inlet pipe; a centrifugal mechanism, which comprises: a driving shaft, a centrifugal impeller connected to the driving shaft, and the centrifugal impeller is arranged at the outlet of the liquid inlet pipe; a plasma generator, which is installed on the driving shaft; a liquid guide plate installed in the tank body, the liquid guide plate extends from the side wall of the liquid inlet pipe to the inner side wall of the tank body, and the liquid guide plate is used to receive the gas-liquid mixed liquid ejected from the centrifugal impeller; and a pulse vibrator arranged on the liquid guide plate. The present application can separate the gas in the drilling fluid under high temperature and high pressure, thereby reducing the frequency of drilling accidents such as blowouts.

Description

Technical Field

[0001] The invention relates to the field of oil and natural gas exploitation, and in particular to a gas-liquid separation device and a separation method thereof. Background Art

[0002] With the continuous deepening of exploration and development, the engineering geological conditions of drilling are becoming more and more complex, gradually moving towards a high-temperature and high-pressure geological environment. Therefore, the technical challenges faced are increasing, and drilling accidents are occurring more and more frequently. Among many accidents, gas invasion is one of the most common types of accidents. Gas invasion refers to the phenomenon that the gas in the formation invades the drilling fluid when drilling into the formation. If the drilling fluid after gas invasion is not degassed in time, then after multiple cycles, the density of the drilling fluid will decrease, which will cause the static liquid column pressure in the entire wellbore to decrease, and in high-temperature and high-pressure formations, it is easy to cause blowout accidents. In addition, if the drilling fluid is not degassed in a timely and thorough manner, the viscosity and shear force of the drilling fluid will increase, the original performance will be destroyed, and the efficiency of the mud pump will decrease. Summary of the invention

[0003] At present, there are four main types of devices for degassing drilling fluid, namely: split-flow tank vacuum degasser, vortex pump vacuum jet degasser, atmospheric degasser, and centrifugal vacuum degasser.

[0004] The principle of the diverter tank vacuum processor mainly relies on the large-area thinning of the drilling fluid. When the drilling fluid rolls forward, a large number of bubbles have the opportunity to be exposed to the surface and burst, thereby achieving the purpose of eliminating bubbles in the drilling fluid. However, this degasser requires a sufficiently large inclined plate area. Therefore, the volume of this diverter tank vacuum processor is very large and the space it occupies is large, making it difficult to adapt to the relatively concentrated working space under high temperature and high pressure environment.

[0005] The principle of the vortex pump vacuum jet degasser is to use a high-speed vortex pump to generate a certain vacuum, and then suck the drilling fluid through the suction pipe in the mud tank. When the drilling fluid reaches the top of the suction pipe, it is blocked by the baffle and forced to refract around the spray tank. When the liquid flow hits the tank wall at high speed, the bubbles are forced to squeeze and break the surface. At the same time, during the injection process and when flowing down the tank wall, the bubbles inside the drilling fluid are constantly exposed to the liquid surface and burst. However, this vortex pump vacuum jet degasser itself has low efficiency, so the power required per unit displacement is large, so it is not suitable for processing high-viscosity drilling fluids that are often used in high-temperature and high-pressure operations.

[0006] Atmospheric ejectors mainly rely on jets to impact and squeeze bubbles, so that the bubbles are squeezed to the surface of the drilling fluid and broken. Therefore, the size of the jet speed directly affects the degassing efficiency. The jet speed is mainly affected by the sinking depth of the degasser: the deeper the sinking, the greater the jet speed. However, the atmospheric ejector is not easy to operate, and the impeller is easy to wear, which is not suitable for high-intensity working environments with high temperature and pressure.

[0007] The principle of the centrifugal vacuum degasser is that the degasser is immersed in the mud tank as a whole, and the bottom mud is pumped into the upper part of the shell along the peripheral wall of the shell through the rotation of the hollow shaft in the reduction box, and finally the drilling fluid moves in a circle, thus forming a centrifugal force field. Under the action of centrifugal force, the bubbles move rapidly toward the center of the axis, and burst when they reach the inner wall of the rotating drilling fluid column, thereby achieving the purpose of removing gas from the drilling fluid. However, even when this degasser is not in use, half of the cylinder is immersed in the drilling fluid, which is easy to cause sand settling corrosion and increase the non-productive time of drilling operations.

[0008] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide a gas-liquid separation device and a separation method thereof, which can separate the gas in the drilling fluid under high temperature and high pressure, thereby reducing the frequency of drilling accidents such as blowouts.

[0009] The specific technical solution of the embodiment of the present invention is:

[0010] A gas-liquid separation device, comprising:

[0011] A tank body, wherein a liquid discharge port is disposed at the lower end of the tank body, and an air outlet port is disposed at the upper end of the tank body;

[0012] A liquid inlet pipe extending into the tank body;

[0013] an infrared emitter disposed on the liquid inlet pipe, the infrared emitter being used to heat the gas in the gas-liquid mixture flowing through the liquid inlet pipe;

[0014] The centrifugal mechanism comprises: a driving shaft, a centrifugal impeller connected to the driving shaft, and the centrifugal impeller is arranged at the outlet of the liquid inlet pipe;

[0015] a plasma generator mounted on the drive shaft;

[0016] A liquid guide plate installed in the tank body, the liquid guide plate extending from the side wall of the liquid inlet pipe to the inner side wall of the tank body, the liquid guide plate being used to receive the gas-liquid mixture ejected from the centrifugal impeller;

[0017] A pulse vibrator is arranged on the liquid guiding plate.

[0018] Preferably, the outlet of the liquid inlet pipe is generally facing upwards.

[0019] Preferably, the pulse vibrator applies pressure pulses to the discharge port by controlling its own electromagnetic switch, and the pressure pulses are achieved by inflation and deflation, and the time interval between inflation and deflation is controlled between 0.1 seconds and 5.0 seconds.

[0020] Preferably, the inflation and deflation of the pulse vibrator is a time interval cycle, and the pulse vibration frequency range is between 0.1 Hz and 5.0 Hz.

[0021] Preferably, the infrared emitter emits high-intensity infrared rays with a peak wavelength of a non-Planckian distribution to heat the gas in the gas-liquid mixture, so that the bubbles in the gas-liquid mixture are fully vaporized.

[0022] Preferably, the liquid guide plate includes the horizontal portion close to the liquid inlet pipe and the inclined portion close to the inner wall of the tank body, the inclined portion extends upward from the liquid inlet pipe toward the inner wall of the tank body, and the pulse vibrator is installed on the inclined portion of the liquid guide plate.

[0023] Preferably, the outlet of the liquid inlet pipe has an outer edge extending in the radial direction of the liquid inlet pipe; the axis of the centrifugal impeller is parallel to or located on the same straight line as the axis of the outlet of the liquid inlet pipe.

[0024] Preferably, the centrifugal mechanism is used to spray the gas-liquid mixture discharged from the outlet of the liquid inlet pipe to impact the inner wall of the tank body.

[0025] Preferably, when the gas-liquid separation device performs gas-liquid separation, the interior of the tank body is in a vacuum state, and there is a liquid seal formed by liquid separated from the gas-liquid mixture at the bottom of the tank body.

[0026] A gas-liquid separation method using any of the gas-liquid separation devices described above, the gas-liquid separation method comprising the following steps:

[0027] Inputting the gas-liquid mixture into the tank from the liquid inlet pipe;

[0028] The gas in the gas-liquid mixture flowing through the liquid inlet pipe is heated by an infrared emitter so that the bubbles in the gas-liquid mixture are fully vaporized;

[0029] The gas-liquid mixture discharged from the outlet of the liquid inlet pipe is sprayed to impact the inner wall of the tank body by a centrifugal mechanism;

[0030] In the process that the gas-liquid mixture is ejected by the centrifugal mechanism to hit the inner wall of the tank body, the plasma generator emits a plasma flow after the centrifugal action of the centrifugal impeller, and the plasma flow breaks the separated bubbles to discharge the gas formed by the bubbles, and the plasma flow also breaks the bubbles in the gas-liquid mixture that has not been centrifuged;

[0031] The gas-liquid mixture that hits the inner wall of the tank body forms a thin layer of turbulent flow along the inner wall of the tank body and the liquid guide plate and falls into the bottom of the tank body to form a liquid seal;

[0032] Applying pressure pulses to the gas-liquid mixture in the tank body by a pulse vibrator, so that the bubbles that have not been broken by the centrifugal mechanism, the plasma generator, and the infrared emitter are subjected to pulse vibration treatment, so as to break the bubbles in the gas-liquid mixture and increase the flow rate of the gas-liquid mixture;

[0033] The liquid that forms the liquid seal further separates the gas in the liquid during the gravity sedimentation process.

[0034] The technical solution of the present invention has the following significant beneficial effects:

[0035] The gas-liquid separation device in the present application can effectively separate gas and liquid in particular for drilling fluid, and can comprehensively and effectively deal with gas invasion problems caused by low formation pore pressure and narrow operating density window in high temperature and high pressure areas, helping drilling engineers to promptly and effectively deal with the invading gas in the drilling fluid, and promptly adjust the drilling construction measures to prevent complex accidents in high temperature and high pressure environments.

[0036] With reference to the following description and drawings, specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Within the spirit and scope of the appended claims, the embodiments of the present invention include many changes, modifications and equivalents. Features described and / or shown for one embodiment can be used in one or more other embodiments in the same or similar manner, combined with features in other embodiments, or replace features in other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the figures are only schematic, used to help understand the present invention, and are not specifically limited to the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to the teachings of the present invention.

[0038] Figure 1Schematic diagram of the structure of the gas-liquid separation device in an embodiment of the present invention.

[0039] Reference numerals in the above drawings:

[0040] 1. Liquid inlet pipe; 11. Outer edge; 12. Outlet; 2. Centrifugal impeller; 3. Plasma generator; 4. Driving shaft; 5. Liquid guide plate; 51. Horizontal part; 52. Inclined part; 6. Air outlet port; 7. Tank body; 8. Liquid discharge port; 9. Infrared transmitter; 10. Pulse vibrator. DETAILED DESCRIPTION

[0041] The details of the present invention can be more clearly understood by combining the accompanying drawings and the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only used for the purpose of explaining the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be regarded as belonging to the scope of the present invention. It should be noted that when an element is referred to as "arranged on" another element, it can be directly on another element or there can also be a central element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there may be a central element at the same time. The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary technicians in the field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation method.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0043] In order to separate the gas in the drilling fluid under high temperature and high pressure, thereby reducing the frequency of drilling accidents such as blowouts, a gas-liquid separation device is proposed in this application. Figure 1 Schematic diagram of the structure of the gas-liquid separation device in the embodiment of the present invention. Figure 1As shown, the gas-liquid separation device may include: a tank body 7, a discharge port 8 is provided at the lower end of the tank body 7, and an air outlet port 6 is provided at the upper end of the tank body 7; a liquid inlet pipe 1 extending into the tank body 7; an infrared emitter 9 arranged on the liquid inlet pipe 1, and the infrared emitter 9 is used to heat the gas in the gas-liquid mixture flowing through the liquid inlet pipe 1; a centrifugal mechanism, which includes: a drive shaft 4, a centrifugal impeller 2 connected to the drive shaft 4, and the centrifugal impeller 2 is arranged at the outlet 12 of the liquid inlet pipe 1; a plasma generator 3, which is installed on the drive shaft 4; a liquid guide plate 5 installed in the tank body 7, the liquid guide plate 5 extends from the side wall of the liquid inlet pipe 1 to the inner wall of the tank body 7, and the liquid guide plate 5 is used to receive the gas-liquid mixture ejected from the centrifugal impeller 2; a pulse vibrator 10 is arranged on the liquid guide plate 5.

[0044] The gas-liquid separation device in the present application can effectively separate gas and liquid in particular for drilling fluid, and can comprehensively and effectively deal with gas invasion problems caused by low formation pore pressure and narrow operating density window in high temperature and high pressure areas, helping drilling engineers to promptly and effectively deal with the invading gas in the drilling fluid, and promptly adjust the drilling construction measures to prevent complex accidents in high temperature and high pressure environments.

[0045] In order to better understand the gas-liquid separation device in this application, it will be further explained and illustrated below. Figure 1 As shown, the tank body 7 can withstand high temperature and high pressure, so it can be made of high-strength metal material. In order to allow the gas-liquid mixer ejected by the centrifugal mechanism to evenly impact the inner wall of the tank body 7 and flow down, the main part of the tank body 7 can extend in the vertical direction, and the cross-section of the main part is circular. A liquid discharge port 8 is provided at the lower end of the tank body 7, and the liquid discharge port 8 is used to discharge the liquid formed after the gas-liquid separation. An air outlet port 6 is provided at the upper end of the tank body 7, and the air outlet port 6 is used to discharge the gas formed after the gas-liquid separation. The air outlet port 6 can be located at the top of the tank body 7 at the upper end of the tank body 7, or it can be located at the side wall of the tank body 7 at the upper end. Generally speaking, as long as the air outlet port 6 is higher than the centrifugal impeller 2 in the centrifugal mechanism by a certain distance, it can be used.

[0046] like Figure 1As shown, the liquid inlet pipe 1 extends into the tank body 7, and the liquid inlet pipe 1 is used to transport a gas-liquid mixture into the tank body 7. The gas-liquid mixture can be a high-temperature and high-pressure well drilling fluid used in the field of oil and natural gas extraction. In order to enable the centrifugal mechanism to evenly spray the gas-liquid mixture flowing out of the outlet 12 of the liquid inlet pipe 1 to the surroundings of the tank body 7, the outlet 12 of the liquid inlet pipe 1 is generally facing upward. The liquid inlet pipe 1 can extend in a vertical direction and extend into the tank body 7 from the bottom of the tank body 7, so that the extension of the liquid inlet pipe 1 can avoid affecting the setting and installation of the liquid guide plate 5. The liquid inlet pipe 1 can be located at the center of the tank body 7, so that the distance from the outlet 12 to the inner wall of the tank body 7 can be equal, so that the centrifugal mechanism can evenly spray the gas-liquid mixture flowing out of the outlet 12 of the liquid inlet pipe 1 to the surroundings of the tank body 7.

[0047] like Figure 1 As shown, the infrared emitter 9 is installed on the side wall of the liquid inlet pipe 1, and the infrared emitter 9 is used to heat the gas in the gas-liquid mixture flowing through the liquid inlet pipe 1. If the gas-liquid mixture contains bubbles, the infrared emitter emits high-intensity infrared rays of the peak wavelength of the non-Planck distribution to heat the gas in the gas-liquid mixture, so that the bubbles in the gas-liquid mixture are fully vaporized by the high-intensity infrared rays at high temperature. There can be multiple infrared emitters 9, which are arranged along the extension direction of the liquid inlet pipe 1, so that the infrared emitters 9 can gradually heat the gas-liquid mixture flowing through the liquid inlet pipe 1 in sequence, thereby effectively increasing the percentage of bubbles in the gas-liquid mixture being vaporized.

[0048] like Figure 1 As shown, the centrifugal mechanism is used to spray the gas-liquid mixture discharged from the outlet 12 of the liquid inlet pipe 1 to the inner side wall of the impact tank body 7. The centrifugal mechanism may include: a drive shaft 4, and a centrifugal impeller 2 connected to the drive shaft 4. The drive shaft 4 is used to transmit torque, and it extends from the outside of the tank body 7 to the inside of the tank body 7, thereby driving the centrifugal impeller 2 to rotate. The motor, gearbox and other devices used to drive the drive shaft 4 to rotate can be installed on the outside of the tank body 7, so as to avoid affecting the separation of gas and liquid in the tank body 7. The centrifugal impeller 2 can be arranged at the outlet 12 of the liquid inlet pipe 1 to process the gas-liquid mixture that has just emerged from the outlet 12 of the liquid inlet pipe 1 and has been treated by the infrared emitter 9, and the gas-liquid mixture is sprayed to the inner side wall of the impact tank body 7 under the centrifugal force of the centrifugal impeller 2. When the gas-liquid mixture is sprayed to the surroundings under the centrifugal force of the centrifugal impeller 2, the bubbles in the gas-liquid mixture will be separated to a certain extent, thereby reducing the content of bubbles in the gas-liquid mixture.

[0049] In a feasible embodiment, the drive shaft 4 is inserted into the tank body 7 from the top of the tank body 7 from the middle along the vertical direction. In addition, the axis of the centrifugal impeller 2 can be parallel to or located on the same straight line as the axis at the outlet 12 of the liquid inlet pipe 1. Through the above structure, it is possible to effectively avoid the drive shaft 4 from blocking the gas-liquid mixture ejected from the centrifugal impeller 2. In order to allow the gas-liquid mixture discharged from the outlet 12 of the liquid inlet pipe 1 to be rotated by the centrifugal impeller 2 as much as possible, rather than directly falling down after passing through the side wall of the outlet 12 of the liquid inlet pipe 1 and unable to be rotated by the centrifugal impeller 2, the outlet 12 of the liquid inlet pipe 1 has an outer edge 11 extending along the radial direction of the liquid inlet pipe 1, and the outer edge 11 is basically parallel to the centrifugal impeller 2, and its outer edge extension is basically equal to the outer edge extension of the centrifugal impeller 2, so that the outer edge 11 will not cause a lower obstruction to the gas-liquid mixture ejected from the centrifugal impeller 2.

[0050] like Figure 1 As shown, the plasma generator 3 is installed on the drive shaft 4. Since the plasma generator contains a wind ring that rotates the gas, it is necessary to ensure that there is enough space around it for it to rotate when it is installed on the drive shaft. The plasma flow emitted by the plasma generator 3 is used to break the bubbles in the uncentrifuged mixed liquid, and at the same time, the bubbles separated by the centrifugal mechanism can be broken to form gas discharge. The mutual cooperation between the plasma generator 3 and the centrifugal mechanism can effectively increase the amount of gas separated from the gas-liquid mixture as a whole, thereby further reducing the gas content in the gas-liquid mixture.

[0051] like Figure 1As shown, the liquid guide plate 5 can be installed inside the tank body 7 by welding. A directional liquid guide hole is provided on the liquid guide plate 5 to ensure accurate reception of the gas-liquid mixture from the centrifugal impeller 2 and to transport the gas-liquid mixture to the bottom of the liquid guide plate 5. The liquid guide plate 5 extends from the side wall of the liquid inlet pipe 1 to the inner wall of the tank body 7, and the liquid guide plate 5 is used to receive the gas-liquid mixture ejected from the centrifugal impeller 2. The height of the liquid guide plate 5 is generally lower than the outlet 12 of the liquid inlet pipe 1. The liquid guide plate 5 has an opening, which is for the liquid inlet pipe 1 to pass through. The liquid guide plate 5 can be connected to the outer wall of the liquid inlet pipe 1. The circumferential side of the liquid guide plate 5 close to the inner wall of the tank body 7 is tightly connected or close to the inner wall of the tank body 7, so that the gas-liquid mixture that hits the inner wall of the tank body 7 can flow to the liquid guide plate 5. In order to make the gas-liquid mixture flow downward after flowing to the liquid guide plate 5, the liquid guide plate 5 may include a horizontal portion 51 close to the liquid inlet pipe 1 and an inclined portion 52 close to the inner wall of the tank body 7, and the inclined portion 52 extends upward from the liquid inlet pipe 1 to the inner wall of the tank body 7. The directional liquid guide hole may be located on the horizontal portion 51. After the gas-liquid mixture ejected from the centrifugal impeller 2 is rotated and ejected out by the centrifugal impeller 2 and the plasma flow emitted by the plasma generator 3, most of the bubbles therein are broken, and the gas-liquid mixture with a lower gas content flows along the tank body 7 and flows toward the liquid guide plate 5. In this process, the gas-liquid mixture will form a thin layer of turbulent flow, and maintain a certain circumferential speed during the period to form a spiral rotation, and finally fall to the bottom of the tank body 7. In the process of thin layer turbulent flow of the gas-liquid mixture, a small amount of bubbles therein will also break and emerge by themselves, which further reduces the gas content in the gas-liquid mixture.

[0052] like Figure 1 As shown, there is a liquid seal formed by the liquid separated from the gas-liquid mixture at the bottom of the tank body 7. Since the liquid falling into the bottom of the tank body 7 has a certain circumferential velocity, the liquid forming the liquid seal also has a certain circumferential flow. In addition, since there is a discharge port 8 at the bottom of the tank body 7, the fluid flows downward and is discharged through the discharge port 8, and a spiral vortex-shaped gravity sedimentation is formed in the process. The flow process of the fluid in the gravity sedimentation helps the gas contained in the liquid to move to the gas-liquid interface and overflow. The gas separated from the liquid in all the above processes is discharged from the gas outlet port 6 at the top of the tank body 7, and the discharge method can be selected by pumping.

[0053] like Figure 1As shown, the pulse vibrator 10 is installed on the liquid guide plate 5, which can effectively save the space occupied by the tank of the entire device and improve the timeliness of the gas-liquid mixture receiving the separation vibration. For example, the pulse vibrator 10 can be installed on the inclined part 52 of the liquid guide plate 5. The pulse vibrator 10 applies pressure pulses to the gas-liquid mixture, especially the bubbles therein, so that the bubbles that have not been removed by the infrared emitter 9, the centrifugal mechanism, and the plasma generator 3 are subjected to pulse vibration treatment, thereby allowing the trace bubbles still mixed in the gas-liquid mixture to rise and emerge. At the same time, the pulse vibration applied by the pulse vibrator 10 can also increase the flow rate of the gas-liquid mixture on the liquid guide plate 5. The pulse vibrator 10 applies a pressure pulse to the discharge port 8 by controlling its own electromagnetic switch. The pressure pulse is achieved by inflation and deflation, and the time interval between inflation and deflation is controlled between 0.1 seconds and 5.0 seconds. In the pulse vibrator 10, inflation and deflation are a time interval cycle, and its pulse vibration frequency range is between 0.1Hz and 5.0Hz.

[0054] In all the above processes, when the gas-liquid separation device performs gas-liquid separation, the interior of the tank body 7 is preferably in a vacuum state. In this way, the bubbles in the gas-liquid mixture can be more easily affected by their own pressure under the action of the vacuum negative pressure in the tank body 7 and emerge from the inside of the liquid to the outside of the liquid, which greatly improves the ease with which the bubbles are separated from the liquid.

[0055] The gas-liquid separation method of the gas-liquid separation device in the present application may include the following steps:

[0056] The gas-liquid mixed liquid is input into the tank body 7 from the liquid inlet pipe 1.

[0057] The infrared emitter 9 heats the gas in the gas-liquid mixture flowing through the liquid inlet pipe 1 so that the bubbles in the gas-liquid mixture are fully vaporized. If the gas-liquid mixture contains bubbles, the infrared emitter emits high-intensity infrared rays with a peak wavelength of a non-Planck distribution to heat the gas in the gas-liquid mixture so that the bubbles in the gas-liquid mixture are fully vaporized by the high-intensity infrared rays at high temperature.

[0058] The gas-liquid mixture discharged from the outlet 12 of the liquid inlet pipe 1 is sprayed to the inner wall of the impact tank 7 through the centrifugal mechanism. When the gas-liquid mixture is sprayed around under the centrifugal force of the centrifugal impeller 2, the bubbles in the gas-liquid mixture will be separated to a certain extent, thereby reducing the content of bubbles in the gas-liquid mixture.

[0059] In the process of the gas-liquid mixture being ejected by the centrifugal mechanism to hit the inner wall of the tank body 7, the plasma generator 3 emits a plasma flow after the centrifugal action of the centrifugal impeller 2. The plasma flow breaks the separated bubbles to discharge the gas formed by the bubbles, and the plasma flow also breaks the bubbles in the gas-liquid mixture that has not been centrifuged. The mutual cooperation between the plasma generator 3 and the centrifugal mechanism can effectively increase the amount of gas separated from the gas-liquid mixture as a whole, thereby further reducing the gas content in the gas-liquid mixture.

[0060] The gas-liquid mixture that hits the inner wall of the tank body 7 forms a thin layer of turbulent flow along the inner wall of the tank body 7 and the liquid guide plate 5 and falls to the bottom of the tank body 7 to form a liquid seal. In this process, the gas-liquid mixture will form a thin layer of turbulent flow, and maintain a certain circumferential speed during the period to form a spiral rotation, and finally fall to the bottom of the tank body 7. During the thin layer turbulent flow of the gas-liquid mixture, a small amount of bubbles in it will also break and emerge by themselves, which further reduces the gas content in the gas-liquid mixture.

[0061] The pulse vibrator 10 applies a pressure pulse to the gas-liquid mixture in the tank 7, so that the bubbles that are not broken by the centrifugal mechanism, the plasma generator 3, and the infrared emitter 9 are subjected to pulse vibration treatment, so that the bubbles in the gas-liquid mixture emerge and break, and the flow rate of the gas-liquid mixture is increased. The pulse vibrator 10 applies a pressure pulse to the discharge port 8 by controlling its own electromagnetic switch. The pressure pulse is achieved by inflation and deflation, and the time interval between inflation and deflation is controlled between 0.1 seconds and 5.0 seconds. In the pulse vibrator 10, inflation and deflation are a time interval cycle, and its pulse vibration frequency range is between 0.1Hz and 5.0Hz.

[0062] The liquid that forms the liquid seal further separates the gas in the liquid during the gravity sedimentation process. Since the bottom of the tank body 7 has a discharge port 8, the liquid that falls into the bottom of the tank body 7 has a certain circumferential velocity, and the fluid flows downward through the discharge port 8 and is discharged, forming a spiral vortex gravity sedimentation in the process. The flow of the fluid during the gravity sedimentation helps the gas contained in the liquid to move to the gas-liquid interface and overflow.

[0063] The specific process steps of gas-liquid separation adopted in this application are: infrared heating vaporization, centrifugal action of centrifugal impeller, plasma flow rupture, and pulse vibration stirring to achieve separation in drilling fluid. In the process of infrared heating vaporization, no propagation medium is required, so electromagnetic wave radiation can be used for preliminary and efficient degassing. The centrifugal action of the centrifugal impeller and plasma flow rupture are both physical refinement actions for degassing. The centrifugal impeller of the centrifuge uses the liquid and gas to be further separated due to different components after being centrifuged. The plasma flow rupture is to use the plasma flow emitted by the plasma emitter to further rupture the gas-liquid mixed flow. The final pulse vibration stirring can separate the gas and liquid in the drilling fluid without destroying the physical and chemical properties of the drilling fluid, and can also accelerate the flow efficiency of the drilling fluid.

[0064] The above technical solution adopted in the present application can have the following advantages: 1. The present application utilizes an infrared emitter 9 to heat the gas-liquid mixture containing gas through infrared heating technology, so that the gas contained in the gas-liquid mixture is fully vaporized. Moreover, infrared rays are safe and stable and will not change the chemical properties of gas-liquid mixtures such as drilling fluids. 2. The present application relies on a combination of a centrifugal mechanism and a plasma generator 3 for degassing, so that the bubbles in the gas-liquid mixture can be broken to the greatest extent. 3. The pulse vibrator 10 in the present application effectively improves the efficiency of gas discharge and gas-liquid mixture flow in the gas-liquid mixture, meeting the requirements of safe and efficient drilling. 4. The entire gas-liquid separation device has a simple structure, is easy to install and replace, and has a replicable and popularizable effect.

[0065] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for various purposes. The term "consisting essentially of ... " describing a combination should include determined elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel features of the combination. The use of the terms "comprising" or "including" to describe the combination of elements, ingredients, parts or steps here also contemplates the implementation method consisting essentially of these elements, ingredients, parts or steps. Here, by using the term "may", it is intended to illustrate that any attribute described that "may" includes is optional. Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "one" used to describe an element, ingredient, part or step is not said to exclude other elements, ingredients, parts or steps.

[0066] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the embodiments can be referred to each other. The above embodiments are only for illustrating the technical concept and features of the present invention. The purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A gas-liquid separation device, characterized in that: The gas-liquid separation device comprises: A tank body, wherein a liquid discharge port is disposed at the lower end of the tank body, and an air outlet port is disposed at the upper end of the tank body; A liquid inlet pipe extending into the tank body; an infrared emitter disposed on the liquid inlet pipe, the infrared emitter being used to heat the gas in the gas-liquid mixture flowing through the liquid inlet pipe; The centrifugal mechanism comprises: a driving shaft, a centrifugal impeller connected to the driving shaft, and the centrifugal impeller is arranged at the outlet of the liquid inlet pipe; a plasma generator mounted on the drive shaft; A liquid guide plate installed in the tank body, the liquid guide plate extending from the side wall of the liquid inlet pipe to the inner side wall of the tank body, the liquid guide plate being used to receive the gas-liquid mixture ejected from the centrifugal impeller; A pulse vibrator is arranged on the liquid guide plate, and the pulse vibrator applies a pressure pulse to the liquid discharge port by controlling its own electromagnetic switch, and the pressure pulse is realized by inflation and deflation, and the time interval between inflation and deflation is controlled between 0.1 seconds and 5.0 seconds; the inflation and deflation in the pulse vibrator are a time interval cycle, and the pulse vibration frequency range is between 0.1Hz and 5.0Hz; The outlet of the liquid inlet pipe is generally facing upward; the outlet of the liquid inlet pipe has an outer edge extending along the radial direction of the liquid inlet pipe; the axis of the centrifugal impeller is parallel to or located on the same straight line as the axis of the outlet of the liquid inlet pipe.

2. The gas-liquid separation device according to claim 1, characterized in that: The infrared emitter emits high-intensity infrared rays with a peak wavelength of non-Planck distribution to heat the gas in the gas-liquid mixture, so that the bubbles in the gas-liquid mixture are fully vaporized.

3. The gas-liquid separation device according to claim 1, characterized in that: The liquid guide plate includes a horizontal portion close to the liquid inlet pipe and an inclined portion close to the inner wall of the tank body. The inclined portion extends upward from the liquid inlet pipe toward the inner wall of the tank body. The pulse vibrator is installed on the inclined portion of the liquid guide plate.

4. The gas-liquid separation device according to claim 1, characterized in that: The centrifugal mechanism is used to spray the gas-liquid mixed liquid discharged from the outlet of the liquid inlet pipe to impact the inner wall of the tank body.

5. The gas-liquid separation device according to claim 1, characterized in that: When the gas-liquid separation device performs gas-liquid separation, the interior of the tank body is in a vacuum state, and a liquid seal formed by liquid separated from the gas-liquid mixture exists at the bottom of the tank body.

6. A gas-liquid separation method using the gas-liquid separation device according to any one of claims 1 to 5, characterized in that: The gas-liquid separation method comprises the following steps: Inputting the gas-liquid mixture into the tank from the liquid inlet pipe; The gas in the gas-liquid mixture flowing through the liquid inlet pipe is heated by an infrared emitter so that the bubbles in the gas-liquid mixture are fully vaporized; The gas-liquid mixture discharged from the outlet of the liquid inlet pipe is sprayed to impact the inner wall of the tank body by a centrifugal mechanism; In the process that the gas-liquid mixture is ejected by the centrifugal mechanism to hit the inner wall of the tank body, the plasma generator emits a plasma flow after the centrifugal action of the centrifugal impeller, and the plasma flow breaks the separated bubbles to discharge the gas formed by the bubbles, and the plasma flow also breaks the bubbles in the gas-liquid mixture that has not been centrifuged; The gas-liquid mixture that hits the inner wall of the tank body forms a thin layer of turbulent flow along the inner wall of the tank body and the liquid guide plate and falls into the bottom of the tank body to form a liquid seal; A pulse vibrator applies pressure pulses to the gas-liquid mixture in the tank body, so that the bubbles that have not been broken by the centrifugal mechanism, the plasma generator, and the infrared emitter are subjected to pulse vibration treatment, so as to break the bubbles in the gas-liquid mixture and increase the flow rate of the gas-liquid mixture; the liquid that forms the liquid seal further separates the gas in the liquid during gravity sedimentation.

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