CN118292813A - A simple sand removal device for natural gas wellhead - Google Patents
A simple sand removal device for natural gas wellhead Download PDFInfo
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- CN118292813A CN118292813A CN202211703353.9A CN202211703353A CN118292813A CN 118292813 A CN118292813 A CN 118292813A CN 202211703353 A CN202211703353 A CN 202211703353A CN 118292813 A CN118292813 A CN 118292813A
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- pipe
- tube
- sand
- natural gas
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/10—Setting of casings, screens, liners or the like in wells
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Cyclones (AREA)
Abstract
The invention discloses a simple sand removing device for a natural gas wellhead, which relates to the technical field of natural gas and comprises a main line pipe, wherein an inlet end of the main line pipe is connected with an air inlet short pipe through a reducer union, a first gate valve is arranged on the air inlet short pipe, the air inlet short pipe is respectively connected with an air inlet pipe and a bypass pipe through a three-way pipe, a rotational flow device, a venturi-like pipe and a slotted pipe are coaxially arranged in the main line pipe in sequence, the venturi-like pipe penetrates through the main line pipe and is communicated with a sand storage pipe through the first short pipe, the main line pipe is communicated with the sand storage pipe through a communicating short joint, an outlet end of the main line pipe and one end of the slotted pipe are both connected with a second short pipe through a flange, the second short pipe is connected with a bent pipe short joint through a flange, the bent pipe short joint is connected with a third gate valve, the third gate valve is connected with a communicating pipe through a three-way pipe, one end of the sand storage pipe is connected with a purge valve through the reducer union, and the other end of the sand storage pipe is connected with a blow-down valve through the reducer union; the sand content of the natural gas wellhead can be effectively removed, and the gas yield is improved.
Description
Technical Field
The invention relates to the technical field of natural gas, in particular to a simple sand removing device for a natural gas wellhead.
Background
With the increasing "age" of the production of a portion of an oilfield gas well, the sand production of the gas well is increasing. At present, how to solve the problems of well mouth sand removal and natural gas yield improvement in the natural gas exploitation process is an urgent need. In order to effectively solve the problem of sand removal, and simultaneously reduce the influence of sand on downstream pipelines and equipment, gas, sand and water are required to be separated from natural gas at a wellhead. The existing common separation devices are two, one is sand removal of a wellhead cyclone device, the main structure of the device is composed of a cyclone separation device, a sand storage tank and other parts, and the device has the defects that the sand storage tank is small in size, high in maintenance frequency and large in manual sand removal workload; the other is a sand removing sled, which mainly comprises a high-pressure cyclone separation device, a sand storage tank, a pipeline, a gate and other parts, and has the advantages of large volume, high cost, pressure vessel, more complicated later supervision and the like. In addition, the mechanical sand filtering pipe of the shaft is adopted on site to prevent sand, the sand filtering pipe column needs to be replaced after perforation, and the problem of high well control risk exists.
Disclosure of Invention
The invention aims at: in order to solve the technical problems, the invention provides a simple sand removing device for a natural gas wellhead.
The invention adopts the following technical scheme for realizing the purposes:
The utility model provides a simple and easy sand removal device of natural gas wellhead, includes the main line pipe, the entrance point of main line pipe is connected with the short pipe that admits air through the reducing joint, be provided with first gate valve on the short pipe that admits air, inlet pipe and bypass pipe are connected respectively through the three-way pipe to the short pipe that admits air, coaxial cyclone, venturi-like pipe, slot pipe have been set gradually in the main line pipe, cyclone's the end of giving vent to anger and venturi-like pipe's inlet end intercommunication, venturi-like pipe runs through main line pipe and sand storage pipe intercommunication through first short pipe, main line pipe passes through the intercommunication nipple joint and sand storage pipe intercommunication, and the communicating pipe is located the cutting pipe below, the exit end of main line pipe and the one end of cutting pipe are all connected through flange and second short pipe, the second short pipe passes through flange joint return bend, the return bend nipple is connected with the third gate valve, the communicating pipe passes through the three-way pipe and is connected respectively with the bypass pipe, the one end of sand storage pipe passes through the reducing joint and connects the purge valve, the other end of sand storage pipe passes through the reducing joint and connects the purge valve.
Further, the cyclone device comprises a spiral sleeve, a fixed tube core arranged in the spiral sleeve and coaxial with the spiral sleeve, and a spiral body arranged on the inner wall of the spiral sleeve around the fixed tube core, wherein a blocking plate is arranged at one end, close to the air inlet end of the spiral sleeve, of the fixed tube core, and the outer wall of the spiral sleeve is connected with the inner wall of the main tube.
Further, the fixed tube core is fixedly connected with the inner wall of the spiral sleeve through a supporting rod.
Further, the venturi-like pipe comprises a shrinkage pipe, a first rectifying pipe, an expansion pipe, a sand discharge pipe, a sand blocking pipe and a second rectifying pipe which are sequentially connected, a sand discharge port is formed in the bottom of the sand discharge pipe, the sand discharge port penetrates through the main pipe through a first short pipe and is communicated with the sand storage pipe, and the outer wall of the rectifying pipe is connected with the outer wall of the main pipe.
Further, the slit pipe comprises a pipe body, and a plurality of slits are formed in the pipe body along the length direction.
Further, a gap is reserved between the outer wall of the slotted tube and the inner wall of the main line, and the slotted tube is connected with the inner wall of the main line tube through a stay bar.
Further, the number of the communication pup joints is at least one.
Further, a sampling port is arranged at the outlet of the sand storage pipe, and a sampling valve is arranged at the sampling port.
Further, the sand storage pipe is connected with the base through the supporting seat, and the bypass pipe and the communicating pipe are connected with the base through the pipe support.
Further, a differential pressure gauge is also included for acquiring the pressures of the main line pipe and the second short pipe.
The beneficial effects of the invention are as follows:
According to the simple sand removing device for the natural gas wellhead, the flow direction of sand carrying fluid is changed through the cyclone device, the straight line form is converted into the spiral form, the fluid generates a rotary flow field, the rotary flow field enters the venturi-like tube, sand grains with relatively high density are separated and enter the sand storage tube under the combined action of centrifugal force and gravity, the flow speed of the natural gas is increased through diameter reduction, the large sand grains are removed, the part of sand grains are deposited into the lower sand storage tube through gravity, secondary filtration separation is carried out through the slit tube, fine sand grains are removed, the natural gas with the sand grains removed enters the sand storage tube through the second short tube and the communicating tube, and then the natural gas with the sand grains removed enters the rear end through the air outlet tube; the sand content of the natural gas wellhead can be effectively removed, the erosion and abrasion of gravel to pipelines and equipment are solved, and the gas production rate is improved; and the structure is simple and easy, the on-site installation is convenient, the processing and manufacturing cost is low, the use and maintenance are convenient, the labor intensity is reduced, and the well control risk is effectively controlled.
Drawings
FIG. 1 is a cross-sectional view of the present invention;
FIG. 2 is a top view of the present invention;
Fig. 3 is a schematic view of the structure of the screw device and venturi-like tube of the present invention.
Reference numerals:
1-first gate valve, 2-second gate valve, 3-reducing joint, 4-swirl device, 41-spiral sleeve, 42-fixed core pipe, 43-spiral body, 44-closure plate, 5-type venturi tube, 51-shrinkage tube, 52-first rectifying tube, 53-expansion tube, 54-sand discharge tube, 55-sand blocking tube, 56-second rectifying tube, 6-slit tube, 7-differential pressure meter, 8-elbow nipple, 9-third gate valve, 10-purge valve, 11-first short tube, 12-sand storage tube, 13-communication nipple, 14-sampling port, 15-blow-off valve, 16-base, 17-pipe support, 18-bypass tube, 19-second short tube, 20-supporting seat, 21-main line tube, 22-communicating tube.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
As shown in fig. 1,2 and 3, the embodiment provides a simple sand removing device for a natural gas wellhead, which comprises a main line pipe 21, wherein the inlet end of the main line pipe 21 is connected with an air inlet short pipe through a reducing joint 3, a first gate valve 1 is arranged on the air inlet short pipe, the air inlet short pipe is respectively connected with an air inlet pipe and a bypass pipe 18 through a three-way pipe, a cyclone device 4, a venturi-like pipe 5 and a slotting pipe 6 are coaxially arranged in the main line pipe 21 in sequence, the air outlet end of the cyclone device 4 is communicated with the air inlet end of the venturi-like pipe 5, the venturi-like pipe 5 penetrates through the main line pipe 21 through the first short pipe 11 and is communicated with a sand storage pipe 12, the main line pipe 21 is communicated with the sand storage pipe 12 through a communication short pipe 13, the communication pipe is positioned below the slotting pipe 6, the outlet end of the main line pipe 21 and one end of the slotting pipe 6 are both connected with a second short pipe 19 through a flange, the second short pipe 19 is connected with the elbow pipe 8 through a flange, the elbow pipe 8 is connected with a third gate valve 9 through the third gate valve 9, the air outlet pipe 9 is connected with a third gate valve 22 through the flange, and the other end of the communication pipe is respectively connected with the sand storage pipe 12 through the reducing joint 3 through the reducing joint 12, and the other end of the communication pipe is connected with the sand storage pipe 12 through the reducing joint 3; the swirling device 4 comprises a spiral sleeve 41, a fixed tube core arranged in the spiral sleeve 41 and coaxial with the spiral sleeve 41, and a spiral body 43 arranged on the inner wall of the spiral sleeve 41 around the fixed tube core, wherein one end of the fixed tube core, which is close to the air inlet end of the spiral sleeve 41, is provided with a blocking plate 44, and the outer wall of the spiral sleeve 41 is connected with the inner wall of the main line pipe 21; the venturi-like tube 5 comprises a shrinkage tube 51, a first rectifying tube 52, an expansion tube 53, a sand discharge tube 54, a sand blocking tube 55 and a second rectifying tube 56 which are sequentially connected, a sand discharge port is arranged at the bottom of the sand discharge tube 54, the sand discharge port penetrates through the main tube 21 through the first short tube 11 to be communicated with the sand storage tube 12, and the outer wall of the rectifying tube is connected with the outer wall of the main tube 21.
The working principle of the invention is as follows: natural gas at the wellhead of the gas well enters the gas inlet pipe from A, enters the cyclone device 4 through the second gate valve 2 to generate strong rotary motion, and then firstly contracts and then gradually expands through the venturi-like tube 5 to accelerate the gas flow rate. Because the density of sand and other mediums in the natural gas is different, under the combined action of centrifugal force, gravity and fluid drag force, sand and water with higher density enter the sand storage pipe 12 through the first short pipe 11 along the radial direction, natural gas and fine sand with lighter density enter the rear end along the axial direction, then gas enters the slit pipe 6 for secondary filtration and separation, and separated sand grains enter the sand storage pipe 12 through the communication short pipe 13. When the amount of sand stored in the sand storage pipe 12 reaches a certain amount, sand discharge treatment is performed through the blow-down valve 15. The desanded natural gas is then exhausted through the communication pipe 22 via outlet pipe B. When in maintenance and overhaul, the main steps are that the first gate valve 1 is opened, the second gate valve 2 and the third gate valve 9 are closed, the blow-off valve 15 is opened, the elbow nipple 8 at the front end of the third gate valve 9 is dismounted, inert gas or high-pressure water is injected into the slotted pipe 6, the elbow nipple 8 is connected after the cleaning is finished, the blow-off valve 15 is closed, and the original flow is restored. When the sand storage pipe 12 of the sand removal device is required to be overhauled and cleaned, the first gate valve 1 is firstly opened, the second gate valve 2 and the third gate valve 9 are closed, then the blow-down valve 15 is opened, the blow-down valve 10 is purged, inert gas or high-pressure water (the pressure is not more than 1 MPa) is injected, the inside of the sand storage pipe 12 is cleaned, and after the cleaning is completed, the blow-down valve 15 and the blow-down valve 10 are closed, so that the original flow is restored. When the sand storage pipe 12 is maintained, overhauled and cleaned, natural gas is discharged from the air outlet pipe through the bypass pipe and the air inlet pipe by B. The cyclone device 4 and the venturi-like tube 5 are rolled by steel plates, and then are installed in a main pipeline through assembly welding, the fixed core tube 42 of the cyclone device 4 and the spiral body 43 can be welded by end welding, the other parts are required to be welded completely, and the welding method suggests a welding method with small heat input amount such as high-frequency pulse mixed gas shielded welding.
In summary, the flow direction of the sand-carrying fluid is changed by the cyclone device 4, the straight line form is changed into the spiral form, the fluid generates a rotating flow field, the fluid enters the venturi-like tube 5, the sand with relatively high density is separated and enters the sand storage tube 12 under the combined action of centrifugal force and gravity, the flow speed of the natural gas is increased by reducing the diameter, the large sand is removed, the part of the sand is deposited into the lower sand storage tube 12 by gravity, the secondary filtration separation is carried out by the slit tube 6, the fine sand is removed, the sand enters the sand storage tube 12, and the natural gas with the sand removed enters the rear end by the air outlet tube after passing through the second short tube 19 and the communicating tube 22; the sand content of the natural gas wellhead can be effectively removed, the erosion and abrasion of gravel to pipelines and equipment are solved, and the gas production rate is improved; and the structure is simple and easy, the on-site installation is convenient, the processing and manufacturing cost is low, the use and maintenance are convenient, the labor intensity is reduced, and the well control risk is effectively controlled.
Example 2
On the basis of embodiment 1, the slit pipe 6 includes a pipe body provided with a plurality of slits in the longitudinal direction.
In this embodiment, the pipe body is provided with a plurality of gaps along the length direction, so that the natural gas entering the pipe body is convenient to carry out secondary filtration and separation, and the separated sand grains fall into the main line pipe 21 through the plurality of gaps and then enter the sand storage pipe 12 through the communication nipple 13.
Example 3
On the basis of the embodiment 1, as shown in fig. 1, a gap is reserved between the outer wall of the slotted tube 6 and the inner wall of the main line, and the slotted tube 6 is connected with the inner wall of the main line tube 21 through a stay bar.
In this embodiment, a gap is reserved between the outer wall of the slotted tube 6 and the inner wall of the main line, so that sand grains in the slotted tube 6 can enter the main line tube 21. The slit pipe 6 is connected with the inner wall of the main pipe 21 through a stay bar, so that the slit pipe 6 is arranged in the main pipe 21 through the stay bar and is coaxially arranged with the main pipe 21.
Example 4
On the basis of embodiment 1, the number of the communication nipple 13 is at least one.
In this embodiment, at least one communication nipple 13 is provided, so that sand grains enter the sand storage pipe 12 through the communication nipple 13.
Example 5
On the basis of the embodiment 1, as shown in fig. 1, a sampling port 14 is arranged at the outlet of the sand storage pipe 12, and a sampling valve is arranged at the sampling port 14.
In this embodiment, the sand storage condition of the sand storage pipe 12 can be obtained through the sampling valve, and when the sand content of the sampling port 14 is more, the sand storage pipe 12 of the sand removal device needs to be overhauled and cleaned.
Example 6
On the basis of the embodiment 1, as shown in fig. 1, the sand storage pipe 12 further comprises a base 16, the sand storage pipe 12 is connected with the base 16 through a supporting seat 20, and the bypass pipe 18 and the communicating pipe 22 are connected with the base 16 through a pipe support 17.
In this embodiment, in order to make the whole device stable and safe, the whole device is mounted on the base 16, so that the pulling and the field installation are convenient.
Example 7
On the basis of embodiment 1, as shown in fig. 1, a differential pressure gauge 7 is further included, said differential pressure gauge 7 being used to obtain the pressure of the main line pipe 21 and the second short pipe 19.
In this embodiment, when the differential pressure gauge 7 shows more than 200KPa, the slit pipe 6 is cleaned, and the service life of the device can be prolonged.
Claims (10)
1. The utility model provides a simple and easy sand removal device of natural gas wellhead, its characterized in that, includes the main line pipe, the entrance point of main line pipe is connected with the short pipe that admits air through the reducing joint, be provided with first gate valve on the short pipe that admits air, inlet pipe and bypass pipe are connected respectively through the three-way pipe to the short pipe that admits air, coaxial swirl device, venturi-like pipe, slotting pipe have been in proper order to the main line intraductal, swirl device's the end of giving vent to anger and venturi-like pipe's inlet end intercommunication, venturi-like pipe runs through main line pipe and sand storage pipe intercommunication through first short pipe, main line pipe is through intercommunication nipple joint and sand storage pipe intercommunication, and the communicating pipe is located the cutting pipe below, the exit end of main line pipe and the one end of cutting pipe are all connected with the second short pipe through the flange, the return pipe nipple is connected with the third through the flange joint, the gate valve is connected with the communicating pipe, outlet duct and bypass pipe are connected respectively through the three-way pipe, the one end of sand storage pipe is through the reducing joint and is connected with the valve, the other end of sand storage pipe is through the reducing joint and is connected with the blow down valve.
2. The simple sand removing device for the natural gas wellhead according to claim 1, wherein the rotational flow device comprises a spiral sleeve, a fixed tube core arranged in the spiral sleeve and coaxial with the spiral sleeve, and a spiral body arranged on the inner wall of the spiral sleeve around the fixed tube core, one end, close to the air inlet end of the spiral sleeve, of the fixed tube core is provided with a blocking plate, and the outer wall of the spiral sleeve is connected with the inner wall of the main tube.
3. The simple and easy sand removing device of natural gas wellhead according to claim 2, wherein the fixed tube core is fixedly connected with the inner wall of the spiral sleeve through a supporting rod.
4. The simple sand removing device for the natural gas wellhead according to claim 1, wherein the venturi-like tube comprises a shrinkage tube, a first rectifying tube, an expansion tube, a sand discharging tube, a sand blocking tube and a second rectifying tube which are sequentially connected, a sand discharging port is formed in the bottom of the sand discharging tube, the sand discharging port penetrates through the main tube through a first short tube and is communicated with the sand storing tube, and the outer wall of the rectifying tube is connected with the outer wall of the main tube.
5. The simple and easy sand removal device of natural gas wellhead according to claim 1, wherein the slotted tube comprises a tube body, and the tube body is provided with a plurality of gaps along the length direction.
6. The simple sand removing device for a natural gas wellhead according to claim 1, wherein a gap is reserved between the outer wall of the slotted tube and the inner wall of the main line, and the slotted tube is connected with the inner wall of the main line tube through a stay bar.
7. The simple sand removal device for a natural gas wellhead according to claim 1, wherein the number of the communicating nipple is at least one.
8. The simple sand removing device for a natural gas wellhead according to claim 1, wherein a sampling port is arranged at the outlet of the sand storage pipe, and a sampling valve is arranged at the sampling port.
9. The simple sand removing device for a natural gas wellhead according to claim 1, further comprising a base, wherein the sand storage pipe is connected with the base through a supporting seat, and the bypass pipe and the communicating pipe are connected with the base through a pipe support.
10. The simple sand removal apparatus for a natural gas wellhead as recited in claim 1, further comprising a differential pressure gauge for acquiring pressures of the main conduit and the second spool.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211703353.9A CN118292813B (en) | 2022-12-28 | 2022-12-28 | A simple desand removal device for natural gas wellheads |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211703353.9A CN118292813B (en) | 2022-12-28 | 2022-12-28 | A simple desand removal device for natural gas wellheads |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN118292813A true CN118292813A (en) | 2024-07-05 |
| CN118292813B CN118292813B (en) | 2025-11-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211703353.9A Active CN118292813B (en) | 2022-12-28 | 2022-12-28 | A simple desand removal device for natural gas wellheads |
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| CN (1) | CN118292813B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201273183Y (en) * | 2008-09-27 | 2009-07-15 | 中国石油天然气股份有限公司 | Axial rotational flow sand removing device for oil well mouth |
| US8881803B1 (en) * | 2014-05-21 | 2014-11-11 | Cavin B. Frost | Desander system |
| CN110735628A (en) * | 2018-07-19 | 2020-01-31 | 中石化广州工程有限公司 | full-bore pipeline type sand removing device |
| CN110735624A (en) * | 2018-07-19 | 2020-01-31 | 中石化广州工程有限公司 | full-bore pipeline type desander |
-
2022
- 2022-12-28 CN CN202211703353.9A patent/CN118292813B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201273183Y (en) * | 2008-09-27 | 2009-07-15 | 中国石油天然气股份有限公司 | Axial rotational flow sand removing device for oil well mouth |
| US8881803B1 (en) * | 2014-05-21 | 2014-11-11 | Cavin B. Frost | Desander system |
| CN110735628A (en) * | 2018-07-19 | 2020-01-31 | 中石化广州工程有限公司 | full-bore pipeline type sand removing device |
| CN110735624A (en) * | 2018-07-19 | 2020-01-31 | 中石化广州工程有限公司 | full-bore pipeline type desander |
Non-Patent Citations (1)
| Title |
|---|
| 孟波;李志忠;唐苏新;魏凤燕;隋志成;付海荣;黄兴伟;: "高压气井轴向旋流除砂装置", 油气田地面工程, no. 03, 20 March 2011 (2011-03-20), pages 91 - 92 * |
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| CN118292813B (en) | 2025-11-14 |
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