Skid-mounted gas wellhead desanding device

Abstract

The utility model relates to a skid-mounted gas well mouth desanding device which comprises a rotational flow gravity desander, a gas well mouth desanding device, a gas well mouth desanding device, a gas well mouth desanding device, a gas well mouth desanding device, a gas well mouth desanding device, a gas well mouth desanding device and a gas well mouth desanding device, the multiple filtering type sand removers are arranged in parallel, inlets of the multiple filtering type sand removers are all connected with an outlet of the rotational flow gravity sand remover, and outlets of the filtering type sand removers are used for discharging filtered natural gas; and each filter type sand remover is provided with a drain outlet and a backwashing opening. The throttling valve and the safety shut-off valve can ensure that a gas mixture from a gas well flows into the rotational flow gravity desander after meeting the pressure condition; the cyclone gravity desander is used for carrying out gas-liquid-solid separation on the entered gas mixture; the filter type desander is used for further separating the gas mixture, and the filtered natural gas is discharged from an outlet of the filter type desander.

Description

Technical Field

[0001] The utility model relates to the technical field of oil, gas and new energy, and in particular to a skid-mounted gas wellhead desanding device. Background Art

[0002] During the extraction process of natural gas wells, untreated natural gas will contain sand and gravel, which may clog valves, pipelines and equipment, reducing pipeline transportation capacity; it may also erode pipelines, pipe fittings and equipment during natural gas transportation, aggravating corrosion damage to ground facilities. Therefore, before natural gas is transported, it needs to be separated and desanded.

[0003] During the exploitation process of air energy storage gas wells, compressed air energy storage air is very likely to carry a large amount of solid sand and gravel. Only sand prevention in the well is far from meeting the sand removal requirements. Therefore, it is often necessary to add a wellhead high-efficiency sand removal device on the ground to further remove the solid sand and gravel in the high-pressure compressed air before entering the turbine generator to prevent the sand and gravel from entering the high-speed rotating expander and damaging the equipment.

[0004] The utility model aims to provide a skid-mounted gas wellhead sand removal device, which is used for efficiently separating sand and gravel from gas. Utility Model Content

[0005] The utility model provides a skid-mounted gas wellhead sand removal device, which is used for efficiently separating sand and gravel from gas.

[0006] The utility model provides a skid-mounted gas wellhead desanding device, comprising:

[0007] A cyclone gravity desander, a throttle valve and a safety cut-off valve are arranged on the pipeline connected to the gas well, and a desander port is arranged at the bottom of the cyclone gravity desander;

[0008] The filter-type desanders are arranged in parallel as a plurality of them, the inlets of the plurality of filter-type desanders are connected to the outlet of the cyclone gravity desander, and the outlet of the filter-type desander is used to discharge the filtered gas; the filter-type desanders are provided with a sewage outlet and a backwash outlet.

[0009] Optionally, along the flow direction of the gas, a first pressure gauge is provided upstream of the throttle valve, and the first pressure gauge is suitable for being electrically connected to an external monitoring device.

[0010] Optionally, a second pressure gauge is provided between the safety shut-off valve and the cyclone gravity desander, and the second pressure gauge is suitable for being electrically connected to an external monitoring device.

[0011] Optionally, a safety pressure relief valve is provided on the upper portion of the cyclone gravity desander.

[0012] Optionally, the bottom of the cyclone gravity desander has a settling area, the bottom of the settling area is a conical mud bucket, and the bottom of the mud bucket is provided with a sand discharge pipe suitable for discharging mud and sand settled in the mud bucket.

[0013] Preferably, the cyclone gravity desander is a vertical cone separator.

[0014] Optionally, the backwash port of the filter-type desander is connected to a backwash pipeline, and a valve is provided on the backwash pipeline; and / or,

[0015] The sewage outlet of the filter-type sand remover is connected to a sewage discharge pipeline, and a valve is arranged on the sewage discharge pipeline.

[0016] Optionally, the outlet of the filter-type desander is connected to a gas pipeline, and the gas pipeline is used to output the gas filtered by the filter-type desander;

[0017] The gas transmission pipe is provided with a valve.

[0018] Optionally, the skid-mounted gas wellhead desanding device further comprises:

[0019] The vent pipeline has an inlet end connected to a pipeline for connecting the cyclone gravity desander and the filter desander, and a valve is provided on the vent pipeline.

[0020] Compared with the prior art, the advantages of the utility model are:

[0021] 1. In the embodiment of the utility model, by setting a throttle valve and a safety shut-off valve, it can be ensured that the gas mixture from the gas well flows into the cyclone gravity desander after meeting the pressure conditions; the cyclone gravity desander performs gas-liquid-solid separation on the incoming gas mixture: the large-particle liquid phase and the large-particle solid phase settle to the sedimentation area at the bottom of the cyclone gravity desander by gravity, and the gas phase and the small-particle solid phase flow into the filter desander through the outlet of the cyclone gravity desander; the filter desander is used to further separate the gas mixture to filter out the small-particle solid phase therein, and the filtered gas is discharged from the outlet of the filter desander.

[0022] Multiple filter-type desanders are arranged and connected in parallel. When one of the filter-type desanders needs to be cleaned, the remaining filter-type desanders can be used for filtering, and the filter-type desanders to be cleaned can be backwashed at the same time, which can improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0024] Figure 1 It is a structural schematic diagram of a skid-mounted gas wellhead desanding device.

[0025] Reference numerals:

[0026] 1. Throttle valve; 2. Safety cut-off valve;

[0027] 3. Cyclone gravity desander; 31. Safety pressure relief valve; 32. Mud bucket;

[0028] 4. Filter-type sand remover; 41. Sewage outlet; 42. Backwash outlet;

[0029] 5. The first pressure gauge; 6. The second pressure gauge;

[0030] 71. Sand discharge pipe; 72. Backwash pipeline; 73. Sewage pipeline; 74. Gas pipeline; 75. Vent pipeline. DETAILED DESCRIPTION

[0031] The utility model will be further described below in conjunction with the accompanying drawings.

[0032] The embodiment of the utility model provides a skid-mounted gas wellhead desander device, comprising a throttle valve 1, a safety cut-off valve 2, a cyclone gravity desander 3 and a filter desander 4.

[0033] The inlet of the cyclone gravity desander 3 is connected to the gas well through a pipeline, and the throttle valve 1 and the safety shut-off valve 2 are sequentially connected and arranged on the connecting pipeline between the cyclone gravity desander 3 and the gas well. The throttle valve 1 is used to throttle and reduce the pressure of the gas mixture from the gas well so that the pressure meets the preset conditions before flowing into the cyclone gravity desander 3, and the gas mixture is a sand-carrying gas; optionally, along the flow direction of the gas, a first pressure gauge 5 is provided upstream of the throttle valve 1, and the first pressure gauge 5 is suitable for being electrically connected to an external monitoring device. Preferably, the first pressure gauge 5 is a remote pressure gauge, which is connected to the central control room through a cable, and the monitoring personnel can read the on-site parameters of the remote pressure gauge in the hollow room for monitoring and control. Preferably, the throttle valve 1 is an electric throttle valve 1.

[0034] Along the flow direction of the gas, the safety shut-off valve 2 is arranged downstream of the throttle valve 1. A second pressure gauge 6 is arranged between the safety shut-off valve 2 and the cyclone gravity desander 3. The second pressure gauge 6 is suitable for being electrically connected to an external monitoring device. The safety shut-off valve 2 is a self-powered automatic emergency shut-off valve. The second pressure gauge 6 is a remote pressure gauge. When the pressure of the second pressure gauge 6 exceeds or falls below a preset value, an alarm is triggered. When the pressure further increases or decreases, the safety shut-off valve 2 can be automatically closed.

[0035] In this embodiment, by providing the throttle valve 1 and the safety cut-off valve 2, it can be ensured that the gas mixture from the gas well flows into the cyclone gravity desander 3 after satisfying the pressure conditions.

[0036] The safety shut-off valve 2 has indication signals that can display the valve position status: ZSC signal and ZSO signal. When the safety shut-off valve 2 is open, ZSC indicates 0 and ZSO indicates 1; when the safety shut-off valve 2 is closed, ZSC indicates 1 and ZSO indicates 0. The safety shut-off valve 2 is connected to the external control system, and the safety shut-off valve 2 can feed back the above indication signals to the control system to monitor the valve position status of the safety shut-off valve 2.

[0037] Preferably, the cyclone gravity desander 3 is a cone separator. The cyclone gravity desander 3 is provided with cyclone internal components, such as cyclone blades. The sand and gravel in the gas sink to the bottom after cyclone and gravity sedimentation, and the gas is discharged from the outlet of the cyclone gravity desander 3. The cyclone gravity desander 3 is provided with a desanding port at the bottom. The cyclone gravity desander 3 has a sedimentation area at the bottom. The bottom of the sedimentation area is a conical mud bucket 32. The desanding port at the bottom of the mud bucket 32 ​​is connected to a sand discharge pipe 71, which is suitable for discharging the mud and sand settled in the mud bucket 32. The gas mixture enters the cyclone gravity desander 3 for gas-liquid-solid separation: the large-particle liquid phase and the large-particle solid phase settle to the sedimentation area at the bottom of the cyclone gravity desander 3 by gravity and are discharged from the sand discharge pipe 71, while the gas phase and the small-particle solid phase flow into the filter desander 4 through the outlet of the cyclone gravity desander 3. The function of the cyclone gravity desander 3 is equivalent to a three-phase separator.

[0038] Optionally, a safety pressure relief valve 31 is provided on the upper part of the cyclone gravity desander 3. When the internal pressure of the cyclone gravity desander 3 is too high, the safety pressure relief valve 31 can be opened to release the pressure to ensure that the internal pressure is within a preset reasonable range. An FBLO full-pass valve is also provided on the pipeline between the safety pressure relief valve 31 and the cyclone gravity desander 3, and the FBLO full-pass valve is in a normally open state; an NC normally closed valve is provided on the parallel bypass of the FBLO full-pass valve, and the NC normally closed valve is in a normally closed state. It should be noted that the connection method of the safety pressure relief valve 31, the FBLO full-pass valve and the NC normally closed valve is common knowledge in the art, and this embodiment does not further limit this.

[0039] The filter desander 4 is provided in multiple numbers and connected in parallel with each other. The inlet of the filter desander 4 is connected to the outlet of the cyclone gravity desander 3, and the outlet of the filter desander 4 is used to discharge the filtered gas; the filter desander 4 has a sewage outlet 41 and a backwash outlet 42. Optionally, the backwash outlet 42 of the filter desander 4 is connected to a backwash pipeline 72, and a valve is provided on the backwash pipeline 72; the sewage outlet 41 of the filter desander 4 is connected to a sewage pipeline 73, and a valve is provided on the sewage pipeline 73. Preferably, the filter desander 4 is a filter screen filter, and a filter screen is provided inside to further filter fine gravel in the gas. Optionally, the skid-mounted gas wellhead desander device also includes a venting pipeline 75, the inlet end of the venting pipeline 75 is connected to the pipeline for connecting the cyclone gravity desander 3 and the filter desander 4, and a valve is provided on the venting pipeline 75. Optionally, the outlet of the filter desander 4 is connected to a gas pipe 74 , and the gas pipe 74 is used to output the gas filtered by the filter desander 4 ; a valve is provided on the gas pipe 74 .

[0040] In this example, there are two filter-type desanders 4, and the two filter-type desanders 4 are standby for each other. When one filter-type desander 4 needs to be cleaned, the valve at the inlet of another standby filter-type desander 4 can be opened to filter using the standby filter-type desander 4, and the filter-type desander 4 to be cleaned can be cleaned at the same time. The two filter-type desanders 4 are independent of each other and do not affect each other, thereby improving production efficiency. Of course, the number of filter-type desanders 4 can also be three or more. This embodiment does not limit the number of filter-type desanders 4, and those skilled in the art can adjust it according to actual conditions.

[0041] When cleaning the filter desander 4 to be cleaned, it is necessary to first close the valve at the inlet of the filter desander 4, then open the valve on the backwashing pipeline 72 and the valve on the venting pipeline 75, inject clean water or cleaning liquid into the filter desander 4 through the backwashing pipeline 72 to backwash it, and the sewage after backwashing is discharged through the venting pipeline 75. Backwashing the filter desander 4 can improve its filtering efficiency.

[0042] In this embodiment, the sand and gravel in the gas mixture are separated in sequence by the cyclone gravity desander and the filter desander 4, and 99.9% of solid particles above 5 μm can be filtered out.

[0043] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A skid-mounted gas wellhead desanding device, characterized in that: include: A cyclone gravity desander (3), wherein a throttle valve (1) and a safety cut-off valve (2) are arranged on a pipeline connected to a gas well, and a desander port is arranged at the bottom of the cyclone gravity desander (3); A plurality of filter-type desanders (4) are arranged in parallel, the inlets of the plurality of filter-type desanders (4) are all connected to the outlet of the cyclone gravity desander (3), and the outlet of the filter-type desander (4) is used to discharge the filtered gas; the filter-type desanders (4) all have a sewage outlet (41) and a backwash outlet (42).

2. The skid-mounted gas wellhead desanding device according to claim 1, characterized in that: Along the flow direction of the gas, a first pressure gauge (5) is arranged upstream of the throttle valve (1), and the first pressure gauge (5) is suitable for being electrically connected to an external monitoring device.

3. The skid-mounted gas wellhead desanding device according to claim 1, characterized in that: A second pressure gauge (6) is provided between the safety shut-off valve (2) and the cyclone gravity desander (3), and the second pressure gauge (6) is suitable for being electrically connected to an external monitoring device.

4. The skid-mounted gas wellhead desanding device according to claim 1, characterized in that: A safety pressure relief valve (31) is provided on the upper part of the cyclone gravity desander (3).

5. The skid-mounted gas wellhead desanding device according to claim 4 is characterized in that: The bottom of the cyclone gravity desander (3) has a sedimentation zone, the bottom of the sedimentation zone is a conical mud bucket (32), and the bottom of the mud bucket (32) is provided with a sand discharge pipe (71) suitable for discharging mud and sand settled in the mud bucket (32).

6. The skid-mounted gas wellhead desanding device according to claim 4 or 5, characterized in that: The cyclone gravity desander (3) is a vertical cone separator.

7. The skid-mounted gas wellhead desanding device according to claim 1, characterized in that: The backwash port (42) of the filter-type desander (4) is connected to a backwash pipeline (72), and a valve is provided on the backwash pipeline (72).

8. The skid-mounted gas wellhead desanding device according to claim 7, characterized in that: Also includes: A venting pipeline (75), the inlet end of which is connected to a pipeline used to connect the cyclone gravity desander (3) and the filter desander (4), and a valve is provided on the venting pipeline (75).

9. The skid-mounted gas wellhead desanding device according to claim 1, 7 or 8, characterized in that: The sewage outlet (41) of the filter-type sand remover (4) is connected to a sewage discharge pipeline (73), and a valve is provided on the sewage discharge pipeline (73).

10. The skid-mounted gas wellhead desanding device according to claim 1, 7 or 8, characterized in that: The outlet of the filter-type desander (4) is connected to a gas delivery pipe (74), and the gas delivery pipe (74) is used to output the gas filtered by the filter-type desander (4); a valve is provided on the gas delivery pipe (74).

Images