Static desanding device for dehydration system of offshore production platform
By installing cyclone desanding separators and anti-vortex check valves in the dehydration system of offshore oil production platforms, combined with sand collection and flushing tanks and solid-liquid separation trolleys, the problems of system shutdown and sand accumulation caused by downhole sand production were solved, static sand removal was achieved, and system efficiency and safety were improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-22
- Publication Date
- 2026-04-03
AI Technical Summary
When faced with sand production conditions in the well, the dehydration system of offshore oil production platforms frequently shuts down, reduces efficiency, affects production capacity and safety, and the accumulated sand causes corrosion to downstream equipment and pipelines and reduces processing capacity.
Cyclone sand separators and anti-vortex check valves are installed downstream of the gas-liquid separator and upstream of the hydrocyclone in the dehydration system. Combined with sand collection and flushing tanks and solid-liquid separation trolleys, static sand removal is achieved to prevent vortex generation and backflow of settled sand.
It effectively prevents sand from accumulating in the system, improves the efficiency of the dewatering system, reduces equipment downtime, ensures safe transportation, enhances downstream processing capacity, and stabilizes production.
Smart Images
Figure CN224071257U_ABST
Abstract
Description
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[0001] The utility model relates to the technical field of sand removal, and particularly relates to a static sand removal device for a dehydration system of an offshore oil production platform. Background Technique
[0002] The production water removal device supporting the main process flow of the offshore oil production platform is one of the important devices in the late stage of oilfield development or rolling development. However, in the face of the working condition of sand production from oil wells, the current high-frequency system shutdown and cleaning not only are not conducive to increasing oil production in the oilfield, but also bring greater safety operation risks, which are mainly manifested in the following aspects:
[0003] 1) Restricting the release of upstream production capacity
[0004] After the large-displacement production water removal device is put into use, the production capacity of production wells is greatly released in the initial stage. However, with the large-scale implementation of various downhole stimulation operations, such as pulling out downhole sand control screens and increasing the frequency of electric pump units, the sand production from the artificial bottom hole is relatively serious. A large amount of accumulated sand has a great impact on the hydrocyclone tubes. The frequent fouling and blockage of the hydrocyclone tubes cause the efficiency of the dehydration system to drop sharply and the processing capacity to decrease significantly. If not cleaned in time, the production water cannot meet the discharge standards.
[0005] 2) Affecting the downstream processing capacity[[ID=
[0012] A cyclone sand separator is respectively installed downstream of the gas-liquid separator and upstream of the hydrocyclone in the dehydration system; a downward-sloping and tangentially oriented inlet pipe is provided in the middle of the cyclone sand separator; a drain pipe is provided at the top of the cyclone sand separator; and a sand outlet is provided at the bottom of the cyclone sand separator; the cyclone sand separator is used for solid-liquid separation of sand in the liquid.
[0013] An anti-vortex check valve is installed below the cyclone sand separator, with its upper end connected to the sand outlet; the anti-vortex check valve is used to prevent vortex generation and backflow of settled sand.
[0014] Preferably, it also includes:
[0015] A sand collecting and flushing tank is located below the anti-vortex check valve, with its upper end connected to the lower end of the anti-vortex check valve. An annular water pipe is provided on the outer periphery of the middle part of the sand collecting and flushing tank, and multiple flushing pipes are evenly distributed along the circumference of the annular water pipe. The flushing pipes pass through the tank wall of the sand collecting and flushing tank and extend into the interior of the sand collecting and flushing tank. An outlet is provided at the lower end of the sand collecting and flushing tank.
[0016] Preferably, a quick-opening blind flange is provided at the outlet.
[0017] Preferably, it also includes:
[0018] A solid-liquid separation trolley is located below the outlet. Inside the solid-liquid separation trolley, there is a partition for dividing the interior of the solid-liquid separation trolley into a sieving area and a storage area. A sieve plate is inclinedly arranged in the sieving area.
[0019] Preferably, it also includes:
[0020] An anti-backflow hood is installed inside the cyclone sand separator and located on the outer periphery of the drain line; the anti-backflow hood is used to prevent sand from flowing back.
[0021] Preferably, the anti-backflow shield has horizontally arranged corrugations on its outer periphery to stabilize the liquid flow and prevent circulation.
[0022] Preferably, the anti-vortex check device includes:
[0023] The cylindrical body has an axial cavity inside;
[0024] Multiple vortex-eliminating blades are arranged axially within the cavity. The multiple vortex-eliminating blades are arranged in a cross shape. The outer edges of the vortex-eliminating blades are welded to the cylinder body. Multiple continuous bends are provided at the lower part of the vortex-eliminating blades.
[0025] The bent portion is provided with multiple corrugated structures.
[0026] Preferably, there are four flushing pipes, and the four flushing pipes are at a 45° angle to the tank wall to swirl the water out, avoiding collision and impact of the flushing water and offsetting the energy.
[0027] The beneficial effects of this utility model are: a cyclone sand separator and an anti-vortex check valve are provided downstream of the gas-liquid separator and upstream of the hydrocyclone in the dehydration system, which can realize static sand removal. Attached Figure Description
[0028] Figure 1 This is a perspective view of a static sand removal device for a dehydration system of an offshore oil production platform according to this utility model.
[0029] Figure 2 This is a cross-sectional view of a static desanding device for a dehydration system of an offshore oil production platform according to this utility model.
[0030] Figure 3 This is a perspective view of the anti-backflow shroud in this utility model.
[0031] Figure 4 This is a perspective view of the vortex-eliminating blade in this utility model.
[0032] Figure 5 This is a perspective view of the solid-liquid separation trolley in this utility model. Detailed Implementation
[0033] The utility model will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.
[0034] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.
[0035] like Figure 1-5 As shown, the present invention relates to a static desanding device for a dehydration system of an offshore oil platform, comprising:
[0036] A cyclone sand separator 110 is respectively installed downstream of the gas-liquid separator in the dehydration system and upstream of the hydrocyclone; a downwardly oriented and tangentially arranged liquid inlet line 111 is provided in the middle of the cyclone sand separator 110; a liquid outlet line 112 is provided at the top of the cyclone sand separator 110; and a sand outlet 113 is provided at the bottom of the cyclone sand separator 110; the cyclone sand separator 110 is used for solid-liquid separation of sand in the liquid.
[0037] An anti-vortex check valve 120 is disposed below the cyclone sand separator 110, with its upper end connected to the sand outlet 113; the anti-vortex check valve 120 is used to prevent vortex generation and backflow of settled sand. Preferably, the anti-vortex check valve 120 is connected to the cyclone sand separator 110 by bolts.
[0038] During operation, the static desanding device of the offshore oil platform dehydration system is first installed downstream (high-pressure section) of the gas-liquid separator and upstream (low-pressure section) of the hydrocyclone. The incoming liquid enters the cyclone desanding separator 110 via the inlet pipeline 111. Under the action of the inner wall of the cyclone desanding separator 110, it is transformed into a swirling state. Under centrifugal force, the sand in the incoming liquid undergoes solid-liquid separation and is discharged through the sand outlet 113. The separated liquid is discharged via the drain pipeline 112. The discharged sand enters the anti-vortex check valve 120, where the anti-vortex blades 122 eliminate vortices and backflow, discharging the sand from below.
[0039] In another embodiment, the system further includes: a sand collecting and flushing tank 130, which is disposed below the anti-vortex check valve 120, with its upper end connected to the lower end of the anti-vortex check valve 120; an annular water pipe 131 is provided on the outer periphery of the middle part of the sand collecting and flushing tank 130, and a plurality of flushing pipes 132 are evenly distributed along the circumference of the annular water pipe 131, the flushing pipes 132 passing through the tank wall of the sand collecting and flushing tank 130 and extending into the interior of the sand collecting and flushing tank 130; an outlet 133 is provided at the lower end of the sand collecting and flushing tank 130. Preferably, the sand collecting and flushing tank 130 is connected to the anti-vortex check valve 120 by bolts.
[0040] In another embodiment, a quick-opening blind flange 134 is provided at the outlet 133.
[0041] In another embodiment, it further includes: a solid-liquid separation trolley 140 disposed below the outlet 133, wherein the solid-liquid separation trolley 140 is provided with a partition 141 for dividing the interior of the solid-liquid separation trolley into a sieving area and a storage area; and a sieve plate 142 is inclinedly disposed in the sieving area.
[0042] In another embodiment, it further includes: an anti-backflow hood 114, which is disposed inside the cyclone sand separator 110 and located on the outer periphery of the drain line 112; the anti-backflow hood 114 is used to prevent sand from flowing back.
[0043] In another embodiment, horizontally arranged corrugations 115 are provided on the outer periphery of the anti-backflow shroud 114 to stabilize the liquid flow and prevent circulation.
[0044] In another embodiment, the anti-vortex check device 120 includes: a cylindrical body 121, which has an axial cavity inside; a plurality of vortex-eliminating blades 122, which are axially disposed in the cavity, the plurality of vortex-eliminating blades 122 are arranged in a cross shape, the outer edges of the vortex-eliminating blades 122 are respectively welded to the cylindrical body 121, and a plurality of continuous bending portions 122a are provided at the lower part of the vortex-eliminating blades 122; wherein, multiple corrugated structures 122b are provided on the bending portions 122a.
[0045] In another embodiment, the plurality of flushing pipes 132 are four, and the four flushing pipes are at a 45° angle to the tank wall, so that the water flows out in a swirling motion to avoid the flushing water colliding and impacting each other, thus offsetting the energy.
[0046] In summary, this utility model discloses a static desanding device for a dehydration system of an offshore oil production platform. It is installed downstream of the gas-liquid separator and upstream of the hydrocyclone in the dehydration system, and is equipped with a cyclone desanding separator 110 and an anti-vortex check valve 120, which can achieve static desanding.
[0047] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.
Claims
1. A static sand removal device for a dehydration system of an offshore oil production platform, characterized in that, It comprises: A cyclone sand separator is arranged downstream of the dewatering system gas-liquid separator and upstream of the hydrocyclone, respectively; A liquid inlet pipeline is arranged in the middle of the cyclone sand separator and is arranged downward and tangentially; a liquid outlet pipeline is arranged at the top of the cyclone sand separator; a sand outlet is arranged at the bottom of the cyclone sand separator; the cyclone sand separator is used for solid-liquid separation of sand in the liquid; A vortex preventing check valve is arranged below the cyclone sand separator, and the upper end thereof is communicated with the sand outlet; the vortex preventing check valve is used for preventing vortex and sand backflow.
2. The static sand removal device of a dehydration system of an offshore oil platform according to claim 1, characterized in that, It further comprises: A sand collecting and flushing tank is arranged below the vortex preventing check valve, and the upper end of the sand collecting and flushing tank is communicated with the lower end of the vortex preventing check valve; an annular water pipe is arranged in the middle of the sand collecting and flushing tank; a plurality of flushing pipes are arranged on the annular water pipe and are uniformly distributed along the circumference; the flushing pipes pass through the tank wall of the sand collecting and flushing tank and extend into the interior of the sand collecting and flushing tank; an outlet is arranged at the lower end of the sand collecting and flushing tank.
3. The static sand removal device of a dehydration system of an offshore oil production platform according to claim 2, characterized in that: A quick-opening blind plate is arranged at the outlet.
4. The static sand removal device of a dehydration system of an offshore oil platform according to claim 3, characterized in that, It further comprises: A solid-liquid separation trolley is arranged below the outlet, and a partition plate is arranged in the solid-liquid separation trolley to divide the interior of the solid-liquid separation trolley into a screening area and a storage area; a sieve plate is arranged in the screening area.
5. The static sand removal device of a dehydration system of an offshore oil platform according to claim 1, characterized in that, It further comprises: An anti-backflow cover is arranged in the cyclone sand separator and is located outside the liquid outlet pipeline; the anti-backflow cover is used for preventing backflow of sand.
6. The static sand removal apparatus of a dehydration system of an offshore production platform according to claim 5, characterized in that: A horizontal transverse corrugation is arranged outside the anti-backflow cover to stabilize the liquid flow and prevent circulation.
7. The static sand removal device of a dehydration system of an offshore oil platform according to claim 1, characterized in that, The vortex preventing check valve comprises: A cylinder body, an internal cavity of which is arranged in an axial direction; A plurality of vortex eliminating blades are arranged in the internal cavity in an axial direction, the plurality of vortex eliminating blades are arranged in a "cross" shape, the outer edges of the vortex eliminating blades are respectively welded to the cylinder body, and a plurality of continuous bending portions are arranged at the lower part of the vortex eliminating blades; A plurality of corrugation structures are arranged on the bending portions.
8. The static sand removal device of a dehydration system of an offshore oil production platform according to claim 2, characterized in that: The plurality of flushing pipes are four, and the four flushing pipes are arranged at an angle of 45° with the tank wall to rotate and flush water, so as to avoid impact of the flushing water and offset the energy.