An antifoam coalescing separator

Abstract

The present invention relates to an anti-foaming coalescing separator, comprising: a skid base and an anti-foaming coalescing separator body, pipelines, valves, instruments, a control system, etc. installed on the skid base. The anti-foaming coalescing separator body includes a cylinder body. A sand discharge port is arranged at the bottom end of the cylinder body, an exhaust port is arranged at the top end, and an air inlet is arranged in the middle; inside the cylinder body, a gas distribution pipe, a primary and secondary collision structure, an anti-foaming coalescer and an end interception structure are sequentially arranged from bottom to top; the first end of the gas distribution pipe is connected to the air inlet, and a first collision structure is arranged at the second end part. In the anti-foaming coalescing separator of the present invention, the first collision structure is used to accelerate gas-liquid separation and can break some foams, facilitating subsequent anti-foaming coalescing treatment; the second collision structure is used to avoid an excessive load on the "anti-foaming and coalescing" section caused by the rapid rise of the foam-containing gas after the primary collision, and at the same time, this structure can also increase the separation process of the fluid and enhance the separation effect.

Description

Technical Field

[0001] The present invention belongs to the technical field of natural gas treatment, and particularly relates to an antifoaming coalescing separator. Background Art

[0002] During normal production of most gas wells, the flow regime in the wellbore is annular mist flow. The liquid is carried to the ground by the gas in the form of droplets, with the gas presenting a continuous phase and the liquid a discontinuous phase. When the gas velocity is too low to provide sufficient energy for the liquid in the wellbore to flow out of the wellhead continuously, the liquid will flow in the opposite direction to the gas and accumulate at the bottom of the well, and the gas well starts to accumulate liquid. The liquid accumulation in the wellbore will increase the backpressure on the gas reservoir, limit the production capacity of the well. If the liquid accumulation in the wellbore is too large, the gas well may stop flowing completely. In addition, the liquid column in the wellbore will damage the formation near the wellbore, reduce the gas-phase permeability, and seriously affect the ultimate recovery rate of the gas field.

[0003] In order to ensure the continuous discharge of all the liquid flowing into the wellbore, a large amount of surfactant is injected into the well. When the accumulated water at the bottom of the well contacts the chemical agent, a large amount of low-density gas-water foam is generated, thus improving the gas-liquid flow regime in the wellbore and lifting the accumulated water at the bottom of the well to the ground to achieve the purpose of discharging the liquid accumulation in the wellbore.

[0004] However, after the gas-water foam is sent to the ground, due to the poor antifoaming effect of the existing separation equipment configured at the front end of the compressor and a large amount of water not being separated, a large amount of foam, water and sand directly rush into the compressor system without being separated in time, resulting in frequent high-level shutdowns of the compressor, blockage and damage of the inlet conical filter screen, and varying degrees of damage to the intake valve and valve seat, causing frequent failure shutdowns of the compressor unit. The above problems have caused difficulties in on-site production and management, and at the same time increased the operation and management costs. Summary of the Invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides an antifoaming coalescing separator. The technical problems to be solved by the present invention are realized through the following technical solutions:

[0006] The present invention provides an antifoaming coalescing separator, comprising: a skid base and an antifoaming coalescing separator body installed on the skid base. The antifoaming coalescing separator body includes a cylinder body, a sand discharge port is arranged at the bottom end of the cylinder body, an exhaust port is arranged at the top end, and an air inlet is arranged in the middle;

[0007] A gas distribution pipe, a second collision structure, an antifoaming coalescer and a terminal interception structure are sequentially arranged in the cylinder body from bottom to top;

[0008] The first end of the gas distribution pipe is connected to the air inlet, and a first collision structure is arranged at the second end.

[0009] In one embodiment of the present invention, the first collision structure is an annular baffle structure sleeved on the second end of the gas distribution pipe.

[0010] In one embodiment of the present invention, injection holes are formed in the pipe wall of the gas distribution pipe near the second port.

[0011] In one embodiment of the present invention, the second collision structure includes a first collision part and a second collision part stacked from bottom to top, wherein

[0012] both the first collision part and the second collision part are umbrella-shaped hollow structures, and the umbrella-shaped edge is open;

[0013] a through hole is formed in the connecting part between the first collision part and the second collision part.

[0014] In one embodiment of the present invention, a plurality of burr holes are provided on the outer baffle of the defoaming coalescer, and the burrs face the gas movement direction.

[0015] In one embodiment of the present invention, the end interception structure is a wire mesh demister or a filter.

[0016] In one embodiment of the present invention, the defoaming coalescing separator further includes a sand storage box installed on the skid base, and the sand storage box is connected to the sand discharge port through a sand discharge pipe.

[0017] In one embodiment of the present invention, a drain port is provided at the lower part of the cylinder body; a flushing port is formed in the cylinder wall corresponding to the installation position of the defoaming coalescer; a flow stabilizing plate is further provided in the cylinder body, and the flow stabilizing plate is located below the gas distribution pipe.

[0018] In one embodiment of the present invention, a first liquid level gauge port and a second liquid level gauge port are further provided at the lower part of the cylinder body, the first liquid level gauge port and the second liquid level gauge port are located between the drain port and the flow stabilizing plate, and the first liquid level gauge port is located above the second liquid level gauge port.

[0019] In one embodiment of the present invention, a plurality of pipelines and a control system are further provided on the skid base, the pipelines are connected to the defoaming coalescing separator body, valves and instruments are installed on the pipelines, and the control system controls the valves to realize the automatic operation of the defoaming coalescing separator.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. The defoaming coalescing separator of the present invention utilizes the first collision structure to accelerate gas-liquid separation and can break some foams, facilitating subsequent defoaming and coalescing treatment;

[0022] 2. The defoaming coalescing separator of the present invention utilizes the second collision structure to avoid excessive load on the "defoaming and coalescing" section caused by the rapid rise of the foam-containing gas after the first collision. At the same time, this structure can also increase the separation process of the fluid and enhance the separation effect.

[0023] Before the foam-containing natural gas enters the compressor, a defoaming coalescing separation process is added to defoam the foam-containing natural gas and perform deep gas-liquid separation, thereby prolonging the service life of the vulnerable parts of the compressor.

[0024] By changing the intake quality of the existing natural gas compressor in this way, the normal operation of the compressor can be ensured, and the long life of the vulnerable parts of the compressor can be achieved.

[0025] The equipment operates fully automatically, realizing remote central control room and mobile client monitoring, and reducing on-site management costs.

[0026] The above description is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable, the following specific preferred embodiments are given and described in detail in conjunction with the accompanying drawings as follows. Brief Description of the Drawings

[0027] Figure 1 It is a schematic structural diagram of a defoaming coalescing separator provided by an embodiment of the present invention;

[0028] Figure 2 It is a schematic structural diagram of a defoaming coalescing separator body provided by an embodiment of the present invention;

[0029] Figure 3 It is a schematic structural diagram of a gas distribution pipe provided by an embodiment of the present invention;

[0030] Figure 4 It is a schematic structural diagram of a second collision structure provided by an embodiment of the present invention;

[0031] Figure 5 It is a schematic structural diagram of an outer baffle of a bubble coalescer provided by an embodiment of the present invention.

[0032] Icons: 1 - skid base; 2 - defoaming coalescing separator body; 201 - cylinder body; 2011 - sand discharge port; 2012 - exhaust port; 2013 - air inlet; 2014 - drain port; 2015 - flushing port; 2016 - first liquid level gauge port; 2017 - second liquid level gauge port; 2018 - safety valve relief port; 2019 - inspection window; 202 - gas distribution pipe; 2021 - first collision structure; 2022 - injection hole; 203 - second collision structure; 2031 - first collision part; 2032 - second collision part; 2033 - through hole; 204 - defoaming coalescer; 205 - end interception structure; 206 - flow stabilizing plate; 3 - sand box. Detailed implementation manners

[0033] In order to further elaborate on the technical means and effects adopted by the present invention to achieve the intended invention purpose, the following provides a detailed description of a defoaming coalescing separator proposed according to the present invention in combination with the accompanying drawings and specific implementation manners.

[0034] The foregoing and other technical contents, features, and effects of the present invention can be clearly presented in the following detailed description in conjunction with the accompanying drawings. Through the description of the specific implementation manners, a more in-depth and specific understanding of the technical means and effects adopted by the present invention to achieve the intended purpose can be obtained. However, the accompanying drawings are only for reference and illustration purposes and are not used to limit the technical solutions of the present invention.

[0035] Embodiment 1

[0036] Please refer to Figures 1 - 5 , Figure 1 , which is a schematic structural diagram of a defoaming coalescing separator provided by an embodiment of the present invention; Figure 2 , which is a schematic structural diagram of a defoaming coalescing separator body provided by an embodiment of the present invention; Figure 3 , which is a schematic structural diagram of a gas distribution pipe provided by an embodiment of the present invention; Figure 4 , which is a schematic structural diagram of a second collision structure provided by an embodiment of the present invention; Figure 5 , which is a schematic structural diagram of an outer baffle of a bubble coalescer provided by an embodiment of the present invention. As shown in the figure, the defoaming coalescing separator of this embodiment includes: a skid base 1 and a defoaming coalescing separator body 2 installed on the skid base 1. The defoaming coalescing separator body 2 includes a cylinder body 201. A sand discharge port 2011 is provided at the bottom end of the cylinder body 201, an exhaust port 2012 is provided at the top end, and an air inlet 2013 is provided in the middle.

[0037] Specifically, in this embodiment, the cylinder body 201 includes an upper head, a middle section of the cylinder body, and a lower head. The upper head and the lower head are connected to the middle section of the cylinder body through flanges. The sand discharge port 2011 is provided at the bottom end of the lower head, the exhaust port 2012 is provided at the top end of the upper head, and the air inlet 2013 is provided in the middle of the middle section of the cylinder body.

[0038] Optionally, the defoaming coalescing separator body 2 is mounted on the skid base 1 through a support seat provided around the sand discharge port 2011.

[0039] Furthermore, a gas distribution pipe 202, a second collision structure 203, a defoaming coalescer 204, and a terminal interception structure 205 are sequentially arranged inside the cylinder body 201 from bottom to top; the first end of the gas distribution pipe 202 is connected to the air inlet 2013, and a first collision structure 2021 is provided at the second end.

[0040] As Figure 3 shown, the first collision structure 2021 is an annular baffle structure sleeved on the second end of the gas distribution pipe 202. Spray holes 2022 are formed in the pipe wall of the gas distribution pipe 202 near the second port.

[0041] Optionally, the spray holes 2022 are in strip shapes, and a plurality of spray holes 2022 can be arranged at intervals around the pipe circumference of the gas distribution pipe 202. When the foam-containing natural gas enters the gas distribution pipe 202 from the air inlet 2013 under the push of pressure and then sprays out from the spray holes 2022, it quickly strikes the first collision structure 2021, which can accelerate gas-liquid separation and break some of the foam.

[0042] As Figure 4 shown, the second collision structure 203 includes a first collision part 2031 and a second collision part 2032 which are stacked from bottom to top. Among them, both the first collision part 2031 and the second collision part 2032 are umbrella-shaped hollow structures, and the umbrella-shaped edges are open; through holes 2033 are formed in the connecting part between the first collision part 2031 and the second collision part 2032.

[0043] Optionally, the bottom angle of the first collision part 2031 and the top angle of the second collision part 2032 are 150°.

[0044] In this embodiment, after the natural gas collides with the first collision structure 2021 once and rises, it collides with the first collision part 2031, and enters the inside of the first collision part 2031 through the opening at the umbrella-shaped edge, then flows into the inside of the second collision part 2032 through the through hole 2033, and after colliding with the second collision part 2032, it flows out through the opening at the umbrella-shaped edge and continues to rise.

[0045] In this embodiment, when the natural gas collides with the second collision structure 203, most of the liquid and large-particle sand and gravel can be removed. Using the second collision structure 203 can avoid the excessive load on the "defoaming and coalescing" section caused by the rapid rise of the foam-containing gas after the first collision. At the same time, this structure can also increase the separation process of the fluid and enhance the separation effect.

[0046] In this embodiment, a number of burr holes are provided on the outer baffle of the defoaming coalescer 204. As shown in Figure 5 the figure, optionally, the burrs face the gas movement direction. It should be noted that the number and aperture of the burr holes are related to the gas flow rate, foaming condition, and grit size, and need to be determined through calculation. Optionally, the aperture of the burr holes is 2-6 mm.

[0047] When the natural gas containing foam rises to the defoaming coalescing zone, the natural gas is penetrated by the burrs on the surface of the outer baffle of the defoaming coalescer 204 and then enters the interior of the defoaming coalescer 204 through these burr holes. The defoaming and coalescing of large liquid droplets are jointly achieved through the burr holes and the inclined flow path inside the defoaming coalescer 204.

[0048] Further, optionally, in this embodiment, the end interception structure 205 is a wire mesh demister or a filter.

[0049] When the gas coalesces through the front-stage defoaming coalescing zone, due to the change in the airflow path from the coalescing section to the trapping section, some uncoalesced saturated liquid water will re-condense and become larger, and then be intercepted and trapped by the end interception structure 205, so as to ensure that the gas entering the compressor will not have the phenomenon of "liquid hammer".

[0050] Further, the defoaming coalescing separator of this embodiment further includes a sand storage box 3. The sand storage box 3 is installed on the skid base 1, and the sand storage box 3 is connected to the sand discharge port 2011 through a sand discharge pipe.

[0051] In this embodiment, the sand storage box 3 is used to store the sand separated during the operation of the equipment. When the accumulated sand reaches a certain amount, it is removed manually. A liquid discharge port is provided at the bottom of the sand storage box 3 for discharging the liquid carried by the sand discharge; in order to prevent electrostatic ignition, the material of the box top cover is selected as PPH board, and the top cover is provided with a hinge for convenient opening and closing. Optionally, the volume of the sand storage box is 0.3 m 3 .

[0052] It should be noted that the skid base 1 is a carrier for equipment, pumps, valves, pipelines, etc. When the skid base 1 is connected to other equipment, there is no need to install valves, instruments, etc. in the middle. The on-site workload is small, and only the external connection of pipelines and electricity needs to be completed, which saves a lot of work for the on-site installation of the equipment. At the same time, it also makes the structure compact, occupies less space, and greatly saves space.

[0053] Further, a drain port 2014 is provided at the lower part of the cylinder body 201; a flushing port 2015 is provided at the cylinder wall corresponding to the installation position of the defoaming coalescer 204.

[0054] In this embodiment, the drain port 2014 discharges sewage through the drain pipe connected thereto, and the external make-up water pipe is connected to the defoaming coalescence separator body 2 through the flushing port 2015 to clean the defoaming coalescer 204 and the end interception structure 205.

[0055] It should be noted that in this embodiment, the sand discharge pipe and the drain pipe are both connected to the bottom of the defoaming coalescence separator body 2 through pipe fittings and valves. Among them, the drain pipe consists of a quick-opening filter and a control valve. When the liquid level in the liquid storage chamber of the defoaming coalescence separator body 2 is at a high level, it automatically discharges the liquid, and when it is at a low level, it automatically closes; when the defoaming coalescence separator body 2 needs to be overhauled, the residues in the equipment are discharged through the sand discharge pipe.

[0056] Furthermore, a flow stabilizing plate 206 is also arranged in the cylinder body 201, and the flow stabilizing plate 206 is located below the gas distribution pipe 202.

[0057] Furthermore, a first liquid level gauge port 2016 and a second liquid level gauge port 2017 are also arranged at the lower part of the cylinder body 201. The first liquid level gauge port 2016 and the second liquid level gauge port 2017 are located between the drain port 2014 and the flow stabilizing plate 206, and the first liquid level gauge port 2016 is located above the second liquid level gauge port 2017.

[0058] Optionally, in other embodiments, for the convenience of pipeline installation and safety valve replacement, a detachable ladder is also provided, which can be connected on-site through bolts.

[0059] Furthermore, a safety valve discharge port 2018 and an inspection window 2019 are also opened on the cylinder body 201 of this embodiment. Among them, the safety valve discharge port 2018 is connected to the discharge system through a discharge pipe, which can be used for the accident state of the defoaming coalescence separator body 2. When the defoaming coalescence separator body 2 is in an accident state, the foam-containing natural gas is sent to the emergency venting process through the safety valve discharge port 2018 and the discharge pipe. The inspection window 2019 facilitates the staff to observe the corrosion condition of the liquid phase area in the cylinder body 201.

[0060] In this embodiment, a number of pipelines and a control system are also arranged on the skid base 1. The pipelines are connected to the defoaming coalescence separator body 2, valves and instruments are installed on the pipelines, and the control system controls the valves to realize the automatic operation of the defoaming coalescence separator. The number of pipelines includes the above-mentioned intake pipeline, exhaust pipeline, liquid discharge pipeline, make-up water pipeline, sand discharge pipeline, etc.

[0061] It should be noted that the whole set of equipment can operate fully automatically or mechanized. When choosing automatic operation, the electric valve automatically adjusts the valve opening according to the liquid level shown by the liquid level gauge to keep the liquid level in the liquid storage area of the tank stable. In the mechanical operation mode, the drain valve of the blowdown bypass pipeline is used for automatic liquid drainage to double guarantee the operation of the equipment. Moreover, signals such as the operating pressure, temperature, liquid level, and valve status of the equipment detected by the instrument can be uploaded to the central control room and the mobile phone client in real time to realize remote control and monitoring of the equipment.

[0062] Furthermore, the working process of the defoaming coalescence separator in this embodiment is described as follows: The foam-containing natural gas is pushed into the gas distribution pipe 202 through the inlet 2013 by pressure. Due to the pressure difference, it sprays out from the injection holes 2022, quickly strikes on the first collision structure 2021, accelerates the gas-liquid separation, and breaks some of the foam. Then it collides with the second collision structure 203 to remove most of the liquid and large particles of sand and gravel. Finally, after defoaming, coalescence, and end interception are achieved through the defoaming coalescer 204 and the end interception structure 205 in sequence, it is discharged through the exhaust port 2012 at the top of the cylinder body 201 and enters the compressor through the pipeline for subsequent compression treatment. During the whole defoaming coalescence treatment process, the excess sand particles and sewage are discharged through the sand discharge port 2011 and the drain port 2014 respectively.

[0063] The defoaming coalescence separator of this embodiment uses the first collision structure to accelerate the gas-liquid separation and can break some of the foam, which is convenient for subsequent defoaming and coalescence treatment; by using the second collision structure, it can avoid the excessive load on the "defoaming and coalescence" section caused by the rapid rise of the foam-containing gas after the first collision. At the same time, this structure can also increase the separation process of the fluid and enhance the separation effect.

[0064] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant are intended to cover non-exclusive inclusion, so that an article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the article or device comprising said element. Similar words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The orientation or positional relationship indicated by "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0065] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. A defoaming coalescence separator, characterized in that, Comprising: A skid base (1) and a defoaming coalescence separator body (2) mounted on the skid base (1). The defoaming coalescence separator body (2) includes a cylinder body (201). A sand discharge port (2011) is provided at the bottom end of the cylinder body (201), an exhaust port (2012) is provided at the top end, and an air inlet (2013) is provided in the middle. Inside the cylinder body (201), a gas distribution pipe (202), a second collision structure (203), a defoaming coalescence device (204), and a terminal interception structure (205) are sequentially arranged from bottom to top. The first end of the gas distribution pipe (202) is connected to the air inlet (2013), and a first collision structure (2021) is provided at the second end. The first collision structure (2021) is a circular baffle structure sleeved on the second end of the gas distribution pipe (202). Injection holes (2022) are formed in the pipe wall of the gas distribution pipe (202) near the second port. The second collision structure (203) includes a first collision part (2031) and a second collision part (2032) stacked from bottom to top. Among them, both the first collision part (2031) and the second collision part (2032) are umbrella-shaped hollow structures, and the umbrella-shaped edges are open. A through hole (2033) is formed in the connecting part between the first collision part (2031) and the second collision part (2032).

2. The coalescing defoaming separator according to claim 1, characterized in that A number of burr holes are provided on the outer baffle of the defoaming coalescence device (204), and the burrs face the gas movement direction.

3. The coalescing defoaming separator according to claim 1, wherein The terminal interception structure (205) is a wire mesh demister or a filter.

4. The defoaming coalescence separator according to claim 1, wherein It further includes a sand storage box (3). The sand storage box (3) is mounted on the skid base (1), and the sand storage box (3) is connected to the sand discharge port (2011) through a sand discharge pipe.

5. The coalescing defoaming separator according to claim 1, wherein A drain port (2014) is provided at the lower part of the cylinder body (201). A flushing port (2015) is formed at the cylinder wall corresponding to the installation position of the defoaming coalescence device (204). A flow stabilizing plate (206) is further provided inside the cylinder body (201), and the flow stabilizing plate (206) is located below the gas distribution pipe (202).

6. The coalescing separator for defoaming according to claim 5, characterized in that, A first liquid level gauge port (2016) and a second liquid level gauge port (2017) are further provided at the lower part of the cylinder body (201). The first liquid level gauge port (2016) and the second liquid level gauge port (2017) are located between the drain port (2014) and the flow stabilizing plate (206), and the first liquid level gauge port (2016) is located above the second liquid level gauge port (2017).

7. The coalescing defoaming separator according to claim 6, characterized in that, A number of pipelines and a control system are further provided on the skid base (1). The pipelines are connected to the defoaming coalescence separator body (2). Valves and instruments are installed on the pipelines, and the control system controls the valves to realize the automatic operation of the defoaming coalescence separator.

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