Oil and gas field high emulsified sewage treatment device and use method thereof

Abstract

The application relates to the technical field of oilfield exploitation, and discloses an oil and gas field high-emulsified sewage treatment device and a use method thereof. The device comprises a plurality of input small holes arranged on the outer wall of the bottom of a sliding block, an annular connecting channel arranged on the inner wall of the sliding block, a tapered channel arranged on the inner wall of the sliding block, and a plurality of output holes arranged on the inner wall of the sliding block. The whole tapered ring has the maximum diameter at the end of the tapered channel communicated with the annular connecting channel, and the tapered ring gradually shrinks when the tapered channel is closer to the output holes, so that the diameter of the tapered ring communicated with the plurality of output holes is the smallest. Therefore, when the high-pressure dissolved gas water moves in the tapered channel, the high-pressure dissolved gas water is subjected to centrifugal force and shearing force due to the spiral effect of the tapered channel, so that the small gas bubbles separated in the tapered channel are further sheared and become smaller, and the bubble combination is inhibited, and the treatment effect during deslagging is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil field exploitation, in particular to an oil and gas field high-emulsified sewage treatment device and a use method thereof. BACKGROUND

[0002] In the process of oil and gas field exploitation, the treatment of high-emulsified oil and gas field sewage has always been a key and difficult problem in the industry. The composition of high-emulsified oil and gas field sewage is complex, containing not only a large amount of emulsified oil, but also high-concentration salts, suspended solids and various additives. The emulsified oil droplets are tiny and wrapped in a stable emulsion film, making it extremely difficult to separate oil and water. The dissolved air flotation machine, as a commonly used equipment for treating such sewage, works on the principle of using the different solubility of water under different pressures to pressurize and aerate part or all of the water to be treated, so that air is dissolved in the water to form dissolved air water. Subsequently, under normal pressure, the dissolved air is released, and the air dissolved in the water is released in the form of tiny bubbles. These bubbles can adhere to oil droplets and suspended solids, and through the action of buoyancy, the pollutants are floated to the water surface, thereby realizing oil-water and solid-liquid separation.

[0003] During the operation of the dissolved air flotation machine, the release channel is the key component for the pressure reduction and release of dissolved air water to generate bubbles. Traditional dissolved air flotation machines mostly use a single release channel design. However, when the dissolved air water is released through a single release channel (such as a traditional orifice plate type or straight pipe type channel), the uniformity of the pressure drop in the channel is poor, and a "high pressure gradient zone" is easily formed in the local area, causing a large amount of gas to be released in a short time and forming a dense bubble group. Due to the concentration of the gas release area of the single channel and the lack of shunt buffering, these bubbles accumulate due to collision and merging during the rising process, forming large-diameter bubble groups, which in turn affects the treatment effect of the sewage. SUMMARY

[0004] To solve the above technical problems, the present application provides an oil and gas field high-emulsified sewage treatment device, which comprises an outer shell, a slag scraping device fixedly connected to the outer wall of the outer shell, a mud outlet fixedly connected to the outer wall of the outer shell, a dross chute fixedly connected to the inner wall of the outer shell, and further comprising:

[0005] A gas release mechanism is fixedly connected to the inner wall of the outer shell, and the gas release mechanism is used to release the pressure of high-pressure dissolved air water;

[0006] A pressure stabilizing mechanism is fixedly connected to the inner wall of the gas release mechanism, and the pressure stabilizing mechanism is used to stabilize the high-pressure dissolved air pressure;

[0007] A limiting mechanism is fixedly connected to the inner wall of the outer shell, and the limiting mechanism is used to limit the output of clean water;

[0008] The inner wall of the shell is fixedly connected with a sewage inlet, the inner wall of the shell is fixedly connected with a demulsifier inlet, the inner wall of the shell is provided with a mixed liquid channel, the inner wall of the shell is fixedly connected with a separation chamber partition plate, the outer wall of the shell is fixedly connected with a high-pressure dissolved gas tank, and the outer wall of the high-pressure dissolved gas tank is fixedly connected with a high-pressure dissolved gas liquid pipeline.

[0009] In use, first, the whole device is placed in a suitable position, then the sewage to be treated is input into the device through the sewage inlet, and the demulsifier is input into the device through the demulsifier inlet, so that the sewage and the demulsifier are fully mixed, and then enter the mixing chamber through the mixed liquid channel.

[0010] Preferably, the gas releasing mechanism comprises:

[0011] The gas releasing assembly is fixedly connected with the outer wall of the high-pressure dissolved gas liquid pipeline.

[0012] Preferably, the pressure stabilizing mechanism comprises:

[0013] The pressure stabilizing assembly is fixedly connected with the inner wall of the gas releasing assembly.

[0014] The output assembly is arranged on the outer wall of the pressure stabilizing assembly.

[0015] Preferably, the limiting mechanism comprises:

[0016] The supporting assembly is fixedly connected with the outer wall of the high-pressure dissolved gas tank.

[0017] The limiting assembly is rotatably connected with the inner wall of the supporting assembly.

[0018] Preferably, the gas releasing assembly comprises two connectors fixedly connected with the outer wall of the high-pressure dissolved gas liquid pipeline, the outer wall of the connector is fixedly connected with a pressure reliever shell, and the inner wall of the pressure reliever shell is fixedly connected with a plurality of output pipes.

[0019] The high-pressure dissolved gas tank is opened, so that the high-pressure dissolved gas water in the high-pressure dissolved gas tank is transported to the connector through the high-pressure dissolved gas liquid pipeline.

[0020] Preferably, the pressure stabilizing assembly comprises a limiting block fixedly connected with the inner wall of the connector, a sliding block slidingly connected with the inner wall of the pressure reliever shell, and a return spring fixedly connected with the top outer wall of the sliding block.

[0021] The outer wall of the end of the return spring away from the sliding block is fixedly connected with the inner wall of the pressure reliever shell.

[0022] When the high-pressure dissolved gas water is not output, the bottom outer wall of the sliding block is tightly attached to the outer wall of the limiting block under the elastic potential energy of the reset spring. When the high-pressure dissolved gas water reaches the attachment position of the limiting block and the sliding block, the sliding block is pushed to move towards the pressure relief shell due to the action of the high-pressure dissolved gas water, and the reset spring is compressed. At the same time, the sliding block starts to move away from the limiting block, so that the high-pressure dissolved gas water can be output through the inside of the sliding block. Due to the fluctuation of the pressure caused by the pipeline and other factors, the over-saturated gas in the high-pressure dissolved gas water is precipitated in advance, resulting in an undesirable slag removal effect.

[0023] Preferably, the output assembly comprises a plurality of input small holes formed in the bottom outer wall of the sliding block, an annular connecting channel formed in the inner wall of the sliding block, a tapered channel formed in the inner wall of the sliding block, and a plurality of output holes formed in the inner wall of the sliding block.

[0024] The annular connecting channel and the plurality of input small holes are in communication with each other. The tapered channel and the annular connecting channel are in communication with each other. The end of the tapered channel away from the annular connecting channel is in communication with the plurality of output holes.

[0025] When the pressure of the high-pressure dissolved gas water is reduced due to various factors, the pressure of the dissolved gas water on the sliding block is reduced. At this time, the sliding block is close to the limiting block under the action of the reset spring, thereby reducing the gap between the limiting block and the sliding block. Further, when the conveying gap is reduced, the pressure of the liquid is increased, thereby reducing a part of the lost dissolved gas and reducing the impact on subsequent slag removal.

[0026] When the high-pressure dissolved gas water reaches the input small holes of the sliding block, the high-pressure dissolved gas water enters the annular connecting channel through the plurality of input small holes. Since the plurality of input small holes and the annular connecting channel are in communication with each other, the high-pressure dissolved gas water entering the plurality of annular connecting channels converges in the annular connecting channel. Further, the high-pressure dissolved gas water converging in the annular connecting channel moves through the tapered channel. Since the end of the tapered channel connected to the annular connecting channel has the largest diameter of the tapered ring, and the tapered ring gradually shrinks as it approaches the output hole, the diameter of the tapered ring connected to the plurality of output holes is the smallest. Thus, the high-pressure dissolved gas water is subjected to centrifugal force and shear force due to the spiral action of the tapered channel during movement in the tapered channel, thereby further shearing the small gas bubbles precipitated in the tapered channel to make them smaller, and inhibiting the coalescence of the gas bubbles to increase the treatment effect during slag removal.

[0027] Meanwhile, since the diameter of the channel wall at the position where the conical channel communicates with the annular connecting channel is the largest, and the diameter of the channel wall gradually decreases as the conical channel shrinks, and the diameter of the channel wall at the output hole is the smallest, the channel gradually decreases as the high-pressure dissolved air water approaches the output hole, so that the flow speed of the high-pressure dissolved air water gradually increases, and the pressure gradually decreases, so that the high-pressure dissolved air water is stable during pressure release, so that the state of reducing water flow is more stable, and the uneven bubble release caused by local vortex or pressure fluctuation is reduced. At the same time, the stable pressure release process can also reduce the water flow impact of the high-pressure dissolved air water during output, prolong the residence time and release process of the dissolved air water, and reduce the gas waste caused by insufficient release.

[0028] Preferably, the support assembly comprises a clean water return pipe fixedly connected to the outer wall of the high-pressure dissolved air tank, an inclined plate fixedly connected to the inner wall of the shell, a clean water partition plate fixedly connected to the inner wall of the shell, and a clean water output port formed in the inner wall of the shell.

[0029] The dissolved air water reaches the inside of the pressure release device through the output hole and is then output through the output pipe. At this time, the dissolved air water and the mixed solution of the demulsifier and the sewage are mixed with each other. Under the action of the micro-bubbles released by the dissolved air water, the micro-bubbles will be adsorbed or embedded in the impurities such as the flocculation of the demulsified mixed solution by the van der waals force, surface tension and other actions, forming a complex with a density less than water. At this time, the dissolved air water and the mixed solution reach the separation chamber between the separation chamber partition plate and the clean water partition plate. At this time, the complex will float to the water surface to form a scum layer due to the action of the buoyancy in the flowing process. At this time, the driving motor in the scum scraping device will drive the scraper to scrape the surface scum layer to the scum slot.

[0030] Preferably, the limiting assembly comprises a connecting shaft rotatably connected to the inner wall of the clean water partition plate, a torsional spring sleeved on the outer wall of the connecting shaft, and a one-way plate fixedly connected to the outer wall of the connecting shaft.

[0031] When the device is just started, the liquid level of the separation chamber is gradually rising. At this time, if the clean water output port is directly opened, part of the scum will enter the clean water pipe with the clean water, thereby polluting the treated clean water and affecting the treatment effect. During the process of the gradual rise of the liquid level, the movement of the one-way plate is limited by the middle part of the torsional spring, and the two ends of the torsional spring are tightly attached to the outer wall of the clean water partition plate, so that the liquid cannot leave the separation chamber during the rising of the liquid level of the separation chamber. As the liquid level continues to rise, the pressure on the one-way plate gradually increases. When the pressure on the one-way plate reaches a certain limit and exceeds the pressure of the torsional spring on the one-way plate, the one-way plate will rotate around the connection with the connecting shaft, so that the clean water can flow into the clean water through the one-way plate and be output through the clean water output port. At the same time, part of the clean water enters the high-pressure dissolved air tank through the clean water return pipe to generate high-pressure dissolved air water.

[0032] A method for using an oil and gas field high-emulsified sewage treatment device, comprising the following steps,

[0033] S1: inputting sewage and demulsifier: sewage and demulsifier are input into the equipment through the sewage input port and the demulsifier input port;

[0034] S2: inputting high-pressure dissolved gas water: high-pressure dissolved gas water is input into the equipment through the high-pressure dissolved gas liquid pipeline using a high-pressure dissolved gas tank.

[0035] The present application has the following beneficial effects:

[0036] (1) The present application is to solve the problem that when high-pressure dissolved gas water is released, a single release channel may cause the pressure to be released too quickly and the gas bubbles to be easily aggregated. The output assembly is provided, when the high-pressure dissolved gas water reaches the input small holes at the sliding block, the high-pressure dissolved gas water enters the annular connecting channel through the input small holes. Since the input small holes and the annular connecting channel are in communication with each other, the high-pressure dissolved gas water entering the annular connecting channel converges in the annular connecting channel. Further, the high-pressure dissolved gas water converging in the annular connecting channel moves through the tapered channel. Since the entire tapered ring of the tapered channel connected to the annular connecting channel has the largest diameter, and the tapered ring gradually shrinks as it approaches the output hole, the diameter of the tapered ring connected to the output hole is the smallest. Thus, the high-pressure dissolved gas water is subjected to centrifugal force and shear force due to the spiral effect of the tapered channel during movement in the tapered channel, further shearing the small gas bubbles separated in the tapered channel, thereby making them smaller and inhibiting bubble coalescence, thereby increasing the treatment effect during deslagging.

[0037] (2) The present application utilizes the above mechanism and operating mechanism. Since the channel wall connected to the annular connecting channel has the largest diameter, and the diameter of the channel wall gradually decreases as the tapered channel shrinks, and the diameter of the channel wall connected to the output hole is the smallest, the channel gradually decreases as the high-pressure dissolved gas water approaches the output hole, the flow velocity of the high-pressure dissolved gas water gradually increases, and the pressure gradually decreases, thereby stabilizing the pressure release process and making the water flow state more stable. This reduces the non-uniformity of bubble separation caused by local vortex or pressure fluctuation. At the same time, the stable pressure release process can also reduce the water flow impact of the high-pressure dissolved gas water during output, prolong the residence time of the dissolved gas water and the separation process, and reduce the gas waste caused by insufficient separation.

[0038] (3) The present application is to solve the pressure variation of high-pressure dissolved air water caused by various factors during output, thereby causing the instability of the dissolved air water, and a pressure stabilizing assembly is arranged, when the high-pressure dissolved air water is not output, the bottom outer wall of the sliding block is tightly attached to the outer wall of the limiting block under the elastic potential energy of the reset spring, when the high-pressure dissolved air water reaches the attachment position of the limiting block and the sliding block, the sliding block is moved towards the pressure release shell under the action of the high-pressure dissolved air water, thereby the reset spring is compressed, at the same time, the sliding block starts to move away from the limiting block, so that the high-pressure dissolved air water can be output through the inside of the sliding block, and the over-saturated gas in the high-pressure dissolved air water will be precipitated in advance due to the pressure fluctuation caused by the pipeline and other factors, thereby the subsequent deslagging effect is not ideal, and at this time, when the pressure of the high-pressure dissolved air water is reduced due to various factors, the pressure of the dissolved air water on the sliding block is reduced, at this time, the sliding block is close to the limiting block under the action of the reset spring, thereby the gap between the limiting block and the sliding block is reduced, and further, when the conveying gap is reduced, the output of the dissolved air water is reduced, and the flow rate of the dissolved air water in the release and the front pipeline is reduced, the impact energy of the pressure fluctuation is partially buffered, the gas precipitation process is more gentle, thereby a part of the lost dissolved air can be reduced, thereby the influence on the subsequent deslagging is reduced;

[0039] (4) The present application is to solve the problem that part of the floating slag will be output with the clean water and pollute the clean water when the liquid surface is gradually rising at the beginning of the separation of the floating slag, a limiting mechanism is arranged, since the liquid surface of the separation chamber is gradually rising, if the clean water outlet is directly opened at this time, part of the floating slag will enter the clean water pipe with the clean water, thereby polluting the treated clean water and affecting the treatment effect, and during the process of the gradual rising of the liquid surface, the liquid cannot leave the separation chamber due to the existence of the torsion spring and the middle part of the torsion spring limiting the movement of the one-way plate, and the two ends of the torsion spring are tightly attached to the outer wall of the clean water baffle, so that the liquid cannot leave the separation chamber during the rising of the liquid surface, and the pressure on the one-way plate is gradually increased with the continuous rising of the liquid surface, when the pressure on the one-way plate reaches a certain limit and exceeds the pressure of the torsion spring on the one-way plate, the one-way plate will rotate around the connecting position of the connecting shaft, thereby the clean water can flow into the clean water through the one-way plate and be output through the clean water outlet, and at the same time, part of the clean water enters the high-pressure dissolved air tank through the clean water return pipe to generate high-pressure dissolved air water. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0041] Figure 1 The overall structure of the application is shown in the schematic view;

[0042] Figure 2 The overall structure of the application is shown in the schematic view;

[0043] Figure 3 The gas release mechanism of the application is shown in the schematic view;

[0044] Figure 4 The gas release mechanism of the application is shown in the schematic view;

[0045] Figure 5 The pressure stabilizing mechanism of the application is shown in the schematic view;

[0046] Figure 6 The pressure stabilizing mechanism of the application is shown in the schematic view; Figure 5 The enlarged view of A in the application is shown in the schematic view;

[0047] Figure 7 The pressure stabilizing mechanism of the application is shown in the schematic view;

[0048] Figure 8 The pressure stabilizing mechanism of the application is shown in the schematic view;

[0049] Figure 9 The pressure stabilizing mechanism of the application is shown in the schematic view;

[0050] Figure 10 The pressure stabilizing mechanism of the application is shown in the schematic view;

[0051] Figure 11 The pressure stabilizing mechanism of the application is shown in the schematic view;

[0052] Figure 12 The pressure stabilizing mechanism of the application is shown in the schematic view; Figure 11 The enlarged view of B in the application is shown in the schematic view;

[0053] Figure 13 The working process of the application is shown in the schematic view.

[0054] In the drawings, the components represented by each number are listed as follows:

[0055] In the figure: 1, release mechanism; 12, release assembly; 13, shell; 14, slag scraping device; 15, mud outlet; 16, dross slot; 111, sewage inlet; 112, demulsifier inlet; 113, mixed liquid channel; 114, separation chamber partition; 115, high-pressure dissolved gas tank; 116, high-pressure dissolved gas liquid pipeline; 121, connector; 122, pressure relief housing; 123, output pipe; 2, pressure stabilizing mechanism; 21, pressure stabilizing assembly; 22, output assembly; 211, limiting block; 212, sliding block; 213, return spring; 221, input small hole; 222, annular connection channel; 223, tapered channel; 224, output hole; 3, limiting mechanism; 31, support assembly; 32, limiting assembly; 311, clean water return pipe; 312, inclined plate; 313, clean water partition; 314, clean water outlet; 321, connecting shaft; 322, torsional spring; 323, one-way plate. DETAILED DESCRIPTION

[0056] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0057] Embodiment one, please refer to Figure 1 Figure 7 The present application is a kind of oil and gas field high emulsification sewage treatment device, including shell 13, the outer wall of shell 13 is fixedly connected with slag scraping device 14, the outer wall of shell 13 is fixedly connected with mud outlet 15, the inner wall of shell 13 is fixedly connected with dross slot 16, further comprising:

[0058] Release mechanism 1, the outer wall of release mechanism 1 is fixedly connected with the inner wall of shell 13, and release mechanism 1 is used for releasing pressure of high-pressure dissolved gas water;

[0059] Pressure stabilizing mechanism 2, the outer wall of pressure stabilizing mechanism 2 is fixedly connected with the inner wall of release mechanism 1, and pressure stabilizing mechanism 2 is used for stabilizing high-pressure dissolved gas pressure;

[0060] Limiting mechanism 3, the outer wall of limiting mechanism 3 is fixedly connected with the inner wall of shell 13, and limiting mechanism 3 is used for limiting clean water output;

[0061] ​The inner wall of the shell 13 is fixedly connected with a sewage inlet 111, the inner wall of the shell 13 is fixedly connected with a demulsifier inlet 112, the inner wall of the shell 13 is provided with a mixed liquid passage 113, the inner wall of the shell 13 is fixedly connected with a separation chamber partition plate 114, the outer wall of the shell 13 is fixedly connected with a high-pressure dissolved gas tank 115, and the outer wall of the high-pressure dissolved gas tank 115 is fixedly connected with a high-pressure dissolved gas liquid pipeline 116.

[0062] In use, first, the whole device is placed in a desired appropriate position, then the sewage to be treated is input into the device through the sewage inlet 111, and the demulsifier is input into the device through the demulsifier inlet 112, so that the sewage and the demulsifier are fully mixed, and then enter the mixing chamber through the mixed liquid passage 113.

[0063] The gas releasing mechanism 1 comprises:

[0064] The gas releasing assembly 12 is fixedly connected with the outer wall of the high-pressure dissolved gas liquid pipeline 116.

[0065] The pressure stabilizing mechanism 2 comprises:

[0066] The pressure stabilizing assembly 21 is fixedly connected with the inner wall of the gas releasing assembly 12;

[0067] The output assembly 22 is provided on the outer wall of the pressure stabilizing assembly 21.

[0068] The limiting mechanism 3 comprises:

[0069] The supporting assembly 31 is fixedly connected with the outer wall of the high-pressure dissolved gas tank 115;

[0070] The limiting assembly 32 is rotatably connected with the inner wall of the supporting assembly 31.

[0071] The gas releasing assembly 12 comprises two connectors 121 fixedly connected with the outer wall of the high-pressure dissolved gas liquid pipeline 116, the outer wall of the connector 121 is fixedly connected with a pressure reliever shell 122, and the inner wall of the pressure reliever shell 122 is fixedly connected with a plurality of output pipes 123.

[0072] The high-pressure dissolved gas tank 115 is opened, so that the high-pressure dissolved gas water in the high-pressure dissolved gas tank 115 is transported to the connector 121 through the high-pressure dissolved gas liquid pipeline 116;

[0073] The pressure stabilizing assembly 21 comprises a limiting block 211 fixedly connected with the inner wall of the connector 121, the inner wall of the pressure reliever shell 122 is slidably connected with a sliding block 212, and the top outer wall of the sliding block 212 is fixedly connected with a return spring 213;

[0074] The one end outer wall of the reset spring 213 is fixedly connected with the inner wall of the pressure relief device shell 122.

[0075] When the high-pressure dissolved gas water is not output, the reset spring 213 is present, the bottom outer wall of the sliding block 212 is tightly attached to the outer wall of the limiting block 211 under the action of the elastic potential energy of the reset spring 213, when the high-pressure dissolved gas water reaches the attachment position of the limiting block 211 and the sliding block 212, the sliding block 212 is moved towards the pressure relief device shell 122 under the action of the high-pressure dissolved gas water, and the reset spring 213 is compressed, and at the same time, the sliding block 212 starts to move away from the limiting block 211, so that the high-pressure dissolved gas water can be output through the inside of the sliding block 212, and the over-saturated gas in the high-pressure dissolved gas water is precipitated in advance due to pressure fluctuation caused by pipeline and other factors, so that the subsequent deslagging effect is not ideal.

[0076] Embodiment two, please refer to Figure 2 Figure 12 The output assembly 22 comprises a plurality of input small holes 221 formed in the bottom outer wall of the sliding block 212, an annular connecting channel 222 formed in the inner wall of the sliding block 212, a tapered channel 223 formed in the inner wall of the sliding block 212, and a plurality of output holes 224 formed in the inner wall of the sliding block 212.

[0077] The annular connecting channel 222 and the plurality of input small holes 221 are in communication with each other, the tapered channel 223 and the annular connecting channel 222 are in communication with each other, and the one end of the tapered channel 223 away from the annular connecting channel 222 is in communication with the plurality of output holes 224.

[0078] When the pressure of the high-pressure dissolved gas water is reduced due to various factors, the pressure of the dissolved gas water on the sliding block 212 is reduced, at this time, the sliding block 212 is close to the limiting block 211 under the action of the reset spring 213, and the gap between the limiting block 211 and the sliding block 212 is reduced, and further, when the conveying gap is reduced, the output of the dissolved gas water is reduced, the flow rate of the dissolved gas water in the release device and the front pipeline is reduced, the impact energy of the pressure fluctuation is partially buffered, the gas precipitation process is more gentle, and a part of the lost dissolved gas can be reduced, and the influence on the subsequent deslagging is reduced.

[0079] ​When the high-pressure dissolved gas water reaches the input small holes 221 at the sliding block 212, the high-pressure dissolved gas water enters the annular connecting channels 222 through the input small holes 221, and since the input small holes 221 and the annular connecting channels 222 are in communication with each other, the high-pressure dissolved gas water entering the annular connecting channels 222 converges in the annular connecting channels 222, and further, the high-pressure dissolved gas water converging in the annular connecting channels 222 moves continuously through the tapered channels 223, and since the tapered channels 223 and the annular connecting channels 222 are in communication at one end of the tapered channels 223, the entire tapered ring has the largest diameter, and the tapered ring gradually shrinks as the tapered channels 223 are closer to the output holes 224, so that the tapered ring has the smallest diameter at the position where the tapered channels 223 are in communication with the output holes 224, and further, since the high-pressure dissolved gas water is subjected to centrifugal force and shear force due to the spiral effect of the tapered channels 223 during the movement of the high-pressure dissolved gas water from the tapered channels 223, the small gas bubbles separated in the tapered channels 223 are further sheared to become smaller, and the bubble coalescence is inhibited, and the treatment effect during slag removal is increased;

[0080] At the same time, since the channel wall of the tapered channels 223 in communication with the annular connecting channels 222 has the largest diameter, and the diameter of the channel wall gradually decreases as the tapered channels 223 shrink, and the diameter of the channel wall at the position in communication with the output holes 224 is the smallest, the channel gradually decreases as the high-pressure dissolved gas water is closer to the output holes 224, so that the flow velocity of the high-pressure dissolved gas water gradually increases, and the pressure gradually decreases, so that the high-pressure dissolved gas water is stable during pressure release, and the state of the water flow is more stable, and the non-uniform separation of gas bubbles caused by local vortex or pressure fluctuation is reduced, and at the same time, the stable pressure release process can also reduce the water flow impact of the high-pressure dissolved gas water during output, prolong the residence time and separation process of the dissolved gas water, and reduce the gas waste caused by insufficient separation;

[0081] The support assembly 31 comprises a clean water return pipe 311 fixedly connected to the outer wall of the high-pressure dissolved gas tank 115, an inclined plate 312 fixedly connected to the inner wall of the shell 13, a clean water partition plate 313 fixedly connected to the inner wall of the shell 13, and a clean water output port 314 formed in the inner wall of the shell 13.

[0082] The dissolved air water reaches the inside of the pressure relief device housing 122 through the output hole 224 and is output through the output pipe 123, and is mixed with the mixed solution of the demulsifier and the sewage at this time, and under the action of the micro bubbles of the dissolved air water, the micro bubbles are adsorbed or embedded in the impurities such as the demulsified flocs in the mixed solution by the van der Waals force, surface tension and the like, to form a complex with a density less than water. At this time, the dissolved air water and the mixed solution reach the separation chamber between the separation chamber partition plate 114 and the clear water partition plate 313, and at this time, the complex floats to the water surface to form a scum layer under the action of the buoyancy in the flowing process, and the driving motor of the scum scraping device 14 drives the scraper to scrape the surface scum layer to the scum slot 16.

[0083] The limiting assembly 32 includes a connecting shaft 321 rotatably connected to the inner wall of the clear water partition plate 313, a torsional spring 322 sleeved on the outer wall of the connecting shaft 321, and a one-way plate 323 fixedly connected to the outer wall of the connecting shaft 321.

[0084] When the device is just started, the liquid level of the separation chamber is gradually rising, and if the clear water outlet is directly opened at this time, part of the scum will enter the clear water pipe with the clear water, thereby polluting the treated clear water and affecting the treatment effect. During the process of the gradual rise of the liquid level, the movement of the one-way plate 323 is limited by the middle part of the torsional spring 322, and the two ends of the torsional spring 322 are tightly attached to the outer wall of the clear water partition plate 313, so that the liquid cannot leave the separation chamber during the rising of the liquid level of the separation chamber. With the continuous rise of the liquid level, the pressure on the one-way plate 323 gradually increases, and when the pressure on the one-way plate 323 reaches a certain limit and exceeds the pressure of the torsional spring 322 on the one-way plate 323, the one-way plate 323 rotates around the connection with the connecting shaft 321, so that the clear water can flow into the clear water through the one-way plate 323 and be output through the clear water outlet 314. At the same time, part of the clear water enters the high-pressure dissolved air tank 115 through the clear water return pipe 311 to generate high-pressure dissolved air water;

[0085] A method for using an oil and gas field high-emulsified sewage treatment device, comprising the following steps,

[0086] S1: inputting sewage and demulsifier: inputting sewage and demulsifier into the device through the sewage input port 111 and the demulsifier input port 112;

[0087] S2: inputting high-pressure dissolved air water: using the high-pressure dissolved air tank 115 to input high-pressure dissolved air water into the device through the high-pressure dissolved air liquid pipe 116.

[0088] One specific application of the embodiment is: in use, first place the entire device in the desired appropriate position, then the sewage to be treated is input into the device through the sewage input port 111, and the demulsifier is input into the device through the demulsifier input port 112, so that the sewage and the demulsifier are fully mixed, and then enter the mixing chamber through the mixed liquid channel 113. At this time, the high-pressure dissolved gas tank 115 is opened, so that the high-pressure dissolved gas water in the high-pressure dissolved gas tank 115 is transported to the connector 121 through the high-pressure dissolved gas liquid pipeline 116;

[0089] When the high-pressure dissolved gas water is not output, the existence of the reset spring 213 makes the bottom outer wall of the sliding block 212 tightly fit with the outer wall of the limiting block 211 under the elastic potential energy of the reset spring 213. When the high-pressure dissolved gas water reaches the fit position of the limiting block 211 and the sliding block 212, the high-pressure dissolved gas water will push the sliding block 212 to move towards the pressure release shell 122 due to the action of the high-pressure dissolved gas water, and the reset spring 213 will be compressed. At the same time, since the sliding block 212 starts to move away from the limiting block 211, the high-pressure dissolved gas water can start to be output through the inside of the sliding block 212. Since the high-pressure dissolved gas water output from the inside of the high-pressure dissolved gas tank 115 will fluctuate due to other factors such as pipelines, the over-saturated gas in the high-pressure dissolved gas water will be precipitated in advance, resulting in an undesirable effect of subsequent deslagging. At this time, when the pressure of the high-pressure dissolved gas water is reduced due to various factors, the pressure of the dissolved gas water on the sliding block 212 will be reduced. At this time, under the action of the reset spring 213, the sliding block 212 will move close to the limiting block 211, thereby reducing the gap between the limiting block 211 and the sliding block 212. Further, when the delivery gap is reduced, the output of the dissolved gas water is reduced, and the flow rate of the dissolved gas water in the release and the front pipeline is reduced. The impact energy of the pressure fluctuation is partially buffered, and the gas precipitation process is more gentle, thereby reducing a part of the lost dissolved gas, and thereby reducing the impact on subsequent deslagging;

[0090] When the high-pressure dissolved air water reaches the input small holes 221 at the sliding block 212, the high-pressure dissolved air water enters the annular connecting channels 222 through the input small holes 221, and since the input small holes 221 and the annular connecting channels 222 are in communication with each other, the high-pressure dissolved air water entering the annular connecting channels 222 converges in the annular connecting channels 222, and further, the high-pressure dissolved air water converging in the annular connecting channels 222 moves continuously through the tapered channels 223, and since the tapered channels 223 and the annular connecting channels 222 are in communication at one end of the tapered ring with the largest diameter, and the tapered ring gradually shrinks as the tapered channels 223 get closer to the output holes 224, the tapered ring has the smallest diameter at the position where the tapered channels 223 and the output holes 224 are in communication, and further, since the high-pressure dissolved air water is subjected to centrifugal force and shear force due to the spiral effect of the tapered channels 223 during the movement of the high-pressure dissolved air water from the tapered channels 223, the small air bubbles separated in the tapered channels 223 are further sheared to become smaller, and at the same time, the air bubble merging is inhibited, and the treatment effect during the slag removal is increased;

[0091] At the same time, since the channel wall diameter of the tapered channels 223 in communication with the annular connecting channels 222 is the largest, and as the tapered channels 223 shrink, the diameter of the channel wall also gradually decreases, and the diameter of the channel wall in communication with the output holes 224 is the smallest, so that the channel gradually decreases during the process of the high-pressure dissolved air water gradually approaching the output holes 224, and the water flow velocity of the high-pressure dissolved air water gradually increases, and the pressure gradually decreases, so that the high-pressure dissolved air water is stable during the pressure relief process, and the state of the water flow is more stable, and the air bubble separation is not uniform due to the local vortex or pressure fluctuation, and at the same time, the stable pressure relief process can also reduce the water flow impact of the high-pressure dissolved air water during the output, prolong the residence time and separation process of the dissolved air water, and reduce the gas waste caused by insufficient separation;

[0092] The dissolved air water reaches the inside of the pressure relief device shell 122 through the output holes 224 and is then output through the output pipe 123, and at the same time, the mixed solution of the demulsifier and the sewage is mixed, and under the action of the small air bubbles separated from the dissolved air water, the small air bubbles are adsorbed or embedded in the impurities in the mixed solution by Van der Waals force, surface tension and other effects, and form a complex with a density less than water, and at this time, the dissolved air water and the mixed solution reach the separation chamber between the separation chamber partition plate 114 and the clear water partition plate 313, and at this time, the complex floats to the water surface to form a scum layer due to the action of the buoyancy during the flow, and at this time, the driving motor of the scum scraping device 14 drives the scraper to scrape the surface scum layer to the scum slot 16;

[0093] When the device is just started, the liquid level of the separation chamber is gradually rising, if the clear water outlet is directly opened, part of the scum will enter the clear water pipe with the clear water, and then pollute the treated clear water, affecting the treatment effect. During the process of the liquid level rising, due to the existence of the torsion spring 322, and the middle part of the torsion spring 322 limits the movement of the one-way plate 323, the two ends of the torsion spring 322 are close to the outer wall of the clear water baffle 313, so that the liquid in the separation chamber cannot leave the separation chamber during the process of the liquid level rising. With the continuous rising of the liquid level, the pressure on the one-way plate 323 gradually increases, when the pressure on the one-way plate 323 reaches a certain limit, and then exceeds the pressure of the torsion spring 322 on the one-way plate 323, the one-way plate 323 will rotate around the connection with the connecting shaft 321, and then the clear water can flow into the clear water through the one-way plate 323, and then be output through the clear water outlet 314. At the same time, part of the clear water enters the high-pressure gas tank 115 through the clear water return pipe 311 to generate high-pressure dissolved gas water.

[0094] The preferred embodiments disclosed above are only used to help explain the present application. The preferred embodiments do not describe all the details, nor limit the application to the specific embodiments described. Obviously, according to the content of the specification, many modifications and changes can be made. The specification selects and describes these embodiments in order to better explain the principles and practical applications of the application, so that those skilled in the art can well understand and utilize the application. The application is limited only by the claims and their full scope and equivalents.

Claims

1. A high-emulsification wastewater treatment device for oil and gas fields, comprising a shell (13), a sludge scraper (14) fixedly connected to the outer wall of the shell (13), a sludge outlet (15) fixedly connected to the outer wall of the shell (13), and a scum trough (16) fixedly connected to the inner wall of the shell (13), characterized in that, Also include: The outer wall of the release mechanism (1) is fixedly connected with the inner wall of the shell (13), and the release mechanism (1) is used for releasing pressure of high pressure dissolved gas water; The outer wall of the pressure stabilizing mechanism (2) is fixedly connected with the inner wall of the release mechanism (1), and the pressure stabilizing mechanism (2) is used for stabilizing high pressure dissolved gas pressure; The outer wall of the limiting mechanism (3) is fixedly connected with the inner wall of the shell (13), and the limiting mechanism (3) is used for limiting clean water output; The inner wall of the shell (13) is fixedly connected with a sewage inlet (111), the inner wall of the shell (13) is fixedly connected with a demulsifier inlet (112), the inner wall of the shell (13) is provided with a mixed liquid channel (113), the inner wall of the shell (13) is fixedly connected with a separation chamber partition (114), the outer wall of the shell (13) is fixedly connected with a high pressure dissolved gas tank (115), and the outer wall of the high pressure dissolved gas tank (115) is fixedly connected with a high pressure dissolved gas liquid pipeline (116); The release mechanism (1) comprises: The outer wall of the release assembly (12) is fixedly connected with the outer wall of the high pressure dissolved gas liquid pipeline (116); The pressure stabilizing mechanism (2) comprises: The outer wall of the pressure stabilizing assembly (21) is fixedly connected with the inner wall of the release assembly (12); The output assembly (22) is provided on the outer wall of the pressure stabilizing assembly (21); The limiting mechanism (3) comprises: The outer wall of the support assembly (31) is fixedly connected with the outer wall of the high pressure dissolved gas tank (115); The outer wall of the limiting assembly (32) is rotatably connected with the inner wall of the support assembly (31); The release assembly (12) comprises two connectors (121) fixedly connected with the outer wall of the high pressure dissolved gas liquid pipeline (116), the outer wall of the connector (121) is fixedly connected with a pressure relief device shell (122), and the inner wall of the pressure relief device shell (122) is fixedly connected with a plurality of output pipes (123); The pressure stabilizing assembly (21) comprises a limiting block (211) fixedly connected with the inner wall of the connector (121), the inner wall of the pressure relief device shell (122) is slidably connected with a sliding block (212), and the top outer wall of the sliding block (212) is fixedly connected with a return spring (213); The outer wall of the end of the return spring (213) away from the sliding block (212) is fixedly connected with the inner wall of the pressure relief device shell (122); The output assembly (22) comprises a plurality of input small holes (221) provided on the bottom outer wall of the sliding block (212), an annular connecting channel (222) is formed in the inner wall of the sliding block (212), a tapered channel (223) is formed in the inner wall of the sliding block (212), and a plurality of output holes (224) are formed in the inner wall of the sliding block (212); The annular connecting channel (222) is communicated with a plurality of input small holes (221), the tapered channel (223) is communicated with the annular connecting channel (222), and the end, away from the annular connecting channel (222), of the tapered channel (223) is communicated with a plurality of output holes (224).

2. The oil and gas field high-emulsified sewage treatment device according to claim 1, characterized in that: The support assembly (31) comprises a clean water backflow pipe (311) fixedly connected to the outer wall of the high-pressure dissolved gas tank (115), an inclined plate (312) fixedly connected to the inner wall of the shell (13), a clean water partition plate (313) fixedly connected to the inner wall of the shell (13), and a clean water outlet (314) formed in the inner wall of the shell (13).

3. The oil and gas field highly emulsified sewage treatment device according to claim 2, characterized in that: The limiting assembly (32) comprises a connecting shaft (321) rotatably connected to the inner wall of the clean water partition plate (313), a torsional spring (322) sleeved on the outer wall of the connecting shaft (321), and a one-way plate (323) fixedly connected to the outer wall of the connecting shaft (321).

4. The use of the oil and gas field high emulsification sewage treatment device, using the oil and gas field high emulsification sewage treatment device of claim 3, characterized in that: The method comprises the following steps, S1: mixing sewage and demulsifier: sewage and demulsifier are input into the device through the sewage input port (111) and the demulsifier input port (112); S2: inputting high-pressure dissolved gas water: high-pressure dissolved gas water is input into the device through the high-pressure dissolved gas liquid pipeline (116) by using the high-pressure dissolved gas tank (115).

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