Continuous sand filtering device

Abstract

The invention relates to a continuous sand filtering device which comprises a water inlet section and a water outlet section, a collecting mechanism is arranged between the water inlet section and the water outlet section in a radial outward extending mode and comprises a first collecting body and a second collecting body, and the first collecting body is in through connection with the water inlet section through a mud and sand buffering section; an anti-backflow structure is mounted at the position, above the first collecting body, of the mud and sand buffering section, and the second collecting body is connected with the first collecting body through a blocking valve; a filter screen is further installed in the water inlet section and obliquely arranged above the mud and sand buffering section, and a first spiral flow channel is formed in the inner wall of the water inlet section to form turbulent flow, so that mud and sand attached to the filter screen are scoured to fall down under the impact of the turbulent flow; the spiral flow channel is arranged on one side of the air inlet of the filter screen to form turbulent flow, mud and sand attached to the filter screen are impacted, the mud and sand gradually fall into the sand storage tank under the action of gravity, shutdown for replacing the filter screen is avoided, the two-stage collecting tank can avoid shutdown for cleaning the deposited mud and sand, and the device is simple in structure and easy to maintain.

Description

Technical Field

[0001] The invention belongs to the technical field of natural gas field development, and in particular relates to a continuous sand filtering device. Background Art

[0002] Sulige gas field is a "three-low" gas field. With the continuous deepening of development scale, the number of low-pressure, low-yield and water-producing wells is increasing, and the drainage and gas production work is becoming increasingly prominent. The natural gas drainage technology is to reduce the pressure at the wellhead of the gas well (less than the external transmission pressure of the pipeline network). This technology can speed up the production speed and the degree of production. It has the advantages of high efficiency and low cost. It is an ideal drainage and production technology for "low-pressure, low-yield and water-producing" gas wells.

[0003] During the natural gas assisted exhaust process, the gas-liquid mixture is returned from the well and enters the compressor after preliminary filtration and separation. The gas-liquid mixture entering the compressor is mainly gas, but there will still be liquid from the well entering the compressor. At this time, the mixed mud and sand will cause damage to the compressor, affecting the normal operation of natural gas assisted exhaust, reducing work efficiency and even causing damage to the compressor and causing shutdown. Summary of the invention

[0004] The present invention solves the technical problem by adopting the following technical solutions:

[0005] A continuous sand filtering device comprises a water inlet section and a water outlet section, wherein a collecting mechanism is radially extended outward between the water inlet section and the water outlet section, wherein the collecting mechanism comprises a first collecting body and a second collecting body, wherein the first collecting body is connected to the water inlet section through a mud and sand buffer section, an anti-backflow structure is installed on the mud and sand buffer section above the first collecting body, and the second collecting body is connected to the first collecting body through a blocking valve;

[0006] A filter screen is also installed in the water inlet section, and the filter screen is tilted and arranged above the mud and sand buffer section. A first spiral flow channel is opened on the inner wall of the water inlet section to form turbulence, so that the mud and sand attached to the filter screen are washed down under the impact of the turbulent flow.

[0007] Furthermore, a second spiral flow channel and / or a baffle is provided on the water outlet section behind the filter screen, so that the water flow passing through the filter screen undergoes a reverse impact, thereby preventing mud and sand from adhering to the filter screen.

[0008] Furthermore, a first baffle is provided on the water outlet section behind the filter screen, and a third spiral flow channel is provided on the inner wall of the inlet and outlet of the first baffle, so that the water flow passing through the filter screen undergoes reverse impact to prevent mud and sand from adhering to the filter screen.

[0009] Furthermore, the first collecting body and the second collecting body are detachably connected.

[0010] Furthermore, it also includes a mounting base, which is mounted on one side of the first collecting body.

[0011] Furthermore, a locking mechanism is installed on the mounting base, and the locking mechanism locks the first collecting body and the second collecting body. The locking mechanism has a triangular connecting rod, and the second collecting body and the first collecting body can be locked or released through the triangular connecting rod.

[0012] Furthermore, the locking mechanism includes a triangular connecting rod, a straight connecting rod, an L-shaped connecting rod and a tension spring, one end of the L-shaped connecting rod is hinged to the mounting base, and the other end is used to press the annular boss on the second collecting body to lock the second collecting body with the first collecting body; one end of the straight connecting rod is hinged to the mounting base, and the other end is hinged to the triangular connecting rod, and the triangular connecting rod is hinged at a right angle to the L-shaped connecting rod; when locking, the hinge points of the triangular connecting rod and the L-shaped connecting rod are on the same straight line as the straight connecting rod, at which time the mechanism can be self-locked, one end of the tension spring is connected to the mounting base, and the other end is connected to the triangular connecting rod, so as to balance the deadweight of the triangular connecting rod and prevent the triangular connecting rod from falling on its own and causing the locking mechanism to unlock.

[0013] Furthermore, the first collecting body and the second collecting body are both tank structures with expanded inner diameters.

[0014] Furthermore, a sand discharge valve is installed at the bottom of the second collecting body.

[0015] The advantages and positive effects of the present invention are:

[0016] In order to prevent the filtered mud and sand from causing pipeline blockage, the present invention provides a spiral flow channel on one side of the filter inlet to form turbulence, which impacts the mud and sand attached to the filter so that it gradually falls into the sand storage tank under the action of gravity, avoiding shutdown for replacing the filter; a baffle plate or a spiral flow channel is provided on one side of the filter outlet so that the gas-liquid mixture passing through the filter is blocked by the baffle plate to generate a reverse impact water flow, thereby strengthening the vibration of the filter and ensuring the continuous operation of the compressor; and the two-stage collecting tank can avoid shutdown for cleaning the deposited mud and sand, and the device has a simple structure and is easy to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but it should be understood that these drawings are designed only for explanation purposes and are not intended to limit the scope of the present invention. In addition, unless otherwise specified, these drawings are intended only to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.

[0018] Figure 1 A cross-sectional schematic diagram of a continuous sand filtering device provided by an embodiment of the present invention;

[0019] Figure 2 A structural cross-sectional view of a first collecting body and a second collecting body of a continuous sand filtering device provided in an embodiment of the present invention;

[0020] Figure 3 A schematic diagram of the three-dimensional structure of a continuous sand filtering device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] First of all, it should be noted that the specific structure, features and advantages of the present invention will be specifically described below by way of example, but all descriptions are only for illustration and should not be understood as limiting the present invention in any way. In addition, any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature displayed or implied in the drawings, can still be combined or deleted between these technical features (or their equivalents) to obtain more other embodiments of the present invention that may not be directly mentioned in this document. In addition, in order to simplify the drawings, the same or similar technical features may be marked only in one place in the same drawing.

[0022] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0023] Example 1

[0024] like Figures 1 to 3 The present embodiment provides a continuous sand filtering device, comprising a water inlet section 1 and a water outlet section 3, wherein a collecting mechanism is radially extended outward between the water inlet section and the water outlet section, wherein the collecting mechanism comprises a first collecting body 6 and a second collecting body 8, wherein the first collecting body is connected to the water inlet section through a mud and sand buffer section 4, a backflow prevention structure 5 is installed in the mud and sand buffer section above the first collecting body, and the second collecting body is connected to the first collecting body through a blocking valve 7;

[0025] The anti-backflow structure includes a straight channel and a curved channel. Along the direction of the falling sand, the curved channel first reverses and then falls. When reverse flow occurs, the reflux liquid flows along the straight channel and the curved channel respectively, but the flow direction of the fluid in the curved channel at the reverse outlet is the same as the falling direction of the sand, which will hinder the reverse flow of the liquid in the straight channel, that is, the flow direction of the curved channel is still the falling direction during reflux, and the straight channel is blocked from reversing at the same time; in order to better hinder the reverse flow of liquid, it can be considered to install multiple anti-backflow structures in series.

[0026] A filter screen 2 is also installed in the water inlet section. The filter screen is tilted above the mud and sand buffer section. The tilt direction of the filter screen is from top to bottom from the water inlet section to the water outlet section. Figure 1 As shown, gravity assists the attached mud and sand to fall, and a first spiral flow channel is opened on the inner wall of the water inlet section to form turbulence, so that the mud and sand attached to the filter screen are washed and fall under the impact of the turbulence.

[0027] A second spiral flow channel and / or a baffle is arranged on the water outlet section behind the filter screen, so that the water flow passing through the filter screen has a reverse impact, thereby preventing mud and sand from adhering to the filter screen.

[0028] A sand discharge valve 9 is installed at the bottom of the second collecting body.

[0029] The first collecting body and the second collecting body are detachably connected; Figure 1 As shown, the first collecting body and the second collecting body are both tank structures with expanded inner diameters.

[0030] Specifically, it also includes an installation base, which is installed on one side of the first collecting body. A locking mechanism is installed on the installation base, and the locking mechanism locks the first collecting body and the second collecting body. There is a triangular connecting rod on the locking mechanism, and the second collecting body can be locked or loosened with the first collecting body through the triangular connecting rod.

[0031] It should be noted that the base 11 is symmetrically arranged, and the locking mechanism 13 includes a triangular connecting rod B, a straight connecting rod C, an L-shaped connecting rod D and a tension spring 12. One end of the L-shaped connecting rod is hinged to the base 11, and the other end is used to press the annular boss on the second collecting body 8 to lock the second collecting body 8 with the first collecting body 6; one end of the straight connecting rod is hinged to the base 11, and the other end is hinged to the triangular connecting rod, and the triangular connecting rod is hinged at a right angle to the L-shaped connecting rod, that is, there are two hinge points on the triangular connecting rod, which are respectively hinged to the straight connecting rod and the L-shaped connecting rod; when locking the second collecting body 8, the triangular connecting rod is pulled upward to drive the straight connecting rod and the L-shaped connecting rod to swing, and finally the L-shaped connecting rod presses the annular boss on the second collecting body 8. When locking, the hinge points of the triangular connecting rod and the L-shaped connecting rod are on the same straight line as the straight connecting rod. At this time, the self-locking of the mechanism can be realized, that is, under the action of the deadweight of the second collecting body 8, the various connecting rods of the locking mechanism 13 cannot move. Figure 2 The locking mechanism 13 on the left side is shown in the figure. One end of the tension spring 12 is connected to the base 11, and the other end is connected to the triangular connecting rod. Its function is to balance the deadweight of the triangular connecting rod to prevent the triangular connecting rod from falling down and causing the locking mechanism 13 to be unlocked, that is, the elastic force of the tension spring is balanced with the triangular connecting rod or keeps the triangular connecting rod in an upward swinging state to ensure the reliability of locking.

[0032] Specifically, when it is necessary to lock the first collecting body 6 and the second collecting body 8, the locking structure 13 pushes the second collecting body upward to lock the second collecting body 8 with the first collecting body 6; wherein, the tension spring pulls the triangular connecting rod downward to separate the second collecting body 8 from the first collecting body 6; the function of the second collecting body 8 is a secondary cache to keep the sand removal device working continuously. After the second collecting body 8 is full of sand, it is removed for cleaning or the shut-off valve 7 is closed for cleaning. The collected mud and sand are temporarily stored in the first collecting body 6 to keep the system in a closed state.

[0033] In this embodiment, the filter screen 2 is provided to ensure that the gas passes normally and the silt is screened out, thereby ensuring the normal operation of the compressor and thus ensuring the work of drainage and gas production; the silt buffer section can assist the sedimentation of silt and prevent the turbulence from flushing the silt up, causing the silt to adhere to the filter screen; the Tesla valve exists because the space below is closed, the liquid does not flow, and the sand and gravel gradually fall under the action of gravity. This valve is used to prevent the silt from returning under the drive of turbulence; when the blocking valve 7 is closed, the sand discharge valve 9 is opened to discharge the sand, and when working, the blocking valve 7 is opened and the sand discharge valve 9 is closed;

[0034] In addition, it can also be considered that an interface can be provided on the second collecting body 8 for flushing the second collecting body 8; a second spiral flow channel and / or a baffle can be provided on the water outlet section 3, and the second spiral flow channel is used for reverse flushing to flush the filter screen during maintenance; in this embodiment, a circle of baffles A is provided on the water outlet section 3 along the inner wall of the pipe, and the baffle A is a circular ring plate with a hole in the middle for water to flow through. The plate blocks water, causing the water flow passing through the filter screen to have a reverse impact, further causing the filter screen to vibrate to avoid mud and sand adhesion. The liquid flows through the middle of the pipe, which is similar to the water flow state of the Tesla valve, but will not have a significant impact on the liquid circulation in the middle of the pipe.

[0035] Example 2

[0036] As a further improvement to the present invention, it can be considered that: a first baffle is set on the water outlet section behind the filter, and a third spiral flow channel is set on the inner wall of the inlet and outlet of the first baffle, the first baffle can play a reverse flushing role during normal filtration, and the third spiral flow channel can play a reverse flushing role when maintaining the device.

[0037] The other structures of this embodiment are the same as those in Embodiment 1 and will not be described again.

[0038] The above embodiments describe the present invention in detail, but the contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A continuous sand filtering device, characterized in that: It includes a water inlet section and a water outlet section, wherein a collecting mechanism is radially extended outward between the water inlet section and the water outlet section, and the collecting mechanism includes a first collecting body and a second collecting body, wherein the first collecting body is connected to the water inlet section through a mud and sand buffer section, an anti-backflow structure is installed on the mud and sand buffer section above the first collecting body, and the second collecting body is connected to the first collecting body through a blocking valve; A filter screen is also installed in the water inlet section, and the filter screen is tilted and arranged above the mud and sand buffer section. A first spiral flow channel is opened on the inner wall of the water inlet section to form turbulence, so that the mud and sand attached to the filter screen are washed down under the impact of the turbulent flow.

2. A continuous sand filtering device according to claim 1, characterized in that: A second spiral flow channel and / or a baffle is arranged on the water outlet section behind the filter screen, so that the water flow passing through the filter screen has a reverse impact, thereby preventing mud and sand from adhering to the filter screen.

3. A continuous sand filtering device according to claim 1, characterized in that: A first baffle is arranged on the water outlet section behind the filter screen, and a third spiral flow channel is arranged on the inner wall of the inlet and outlet of the first baffle, so that the water flow passing through the filter screen has a reverse impact to prevent mud and sand from adhering to the filter screen.

4. A continuous sand filtering device according to claim 1, characterized in that: The first collecting body and the second collecting body are detachably connected.

5. A continuous sand filtering device according to claim 1, characterized in that: The invention also comprises a mounting base, wherein the mounting base is mounted on one side of the first collecting body.

6. A continuous sand filtering device according to claim 5, characterized in that: A locking mechanism is installed on the installation base, and the locking mechanism locks the first collecting body and the second collecting body. The locking mechanism has a triangular connecting rod, and the second collecting body and the first collecting body can be locked or released through the triangular connecting rod.

7. A continuous sand filtering device according to claim 6, characterized in that: The locking mechanism includes a triangular connecting rod, a straight connecting rod, an L-shaped connecting rod and a tension spring. One end of the L-shaped connecting rod is hinged to the mounting base, and the other end is used to press the annular boss on the second collecting body to lock the second collecting body with the first collecting body; one end of the straight connecting rod is hinged to the mounting base, and the other end is hinged to the triangular connecting rod, and the triangular connecting rod is hinged at a right angle to the L-shaped connecting rod; when locking, the hinge points of the triangular connecting rod and the L-shaped connecting rod are on the same straight line as the straight connecting rod, and the self-locking of the mechanism can be achieved at this time. One end of the tension spring is connected to the mounting base, and the other end is connected to the triangular connecting rod, so as to balance the deadweight of the triangular connecting rod and prevent the triangular connecting rod from falling by itself and causing the locking mechanism to be unlocked.

8. A continuous sand filtering device according to claim 1, characterized in that: The first collecting body and the second collecting body are both tank structures with enlarged inner diameters.

9. A continuous sand filtering device according to claim 1, characterized in that: A sand discharge valve is installed at the bottom of the second collecting body.

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