LU501407B1 - Inclined pipe-type h-shaped subsea online crude oil separation system - Google Patents
Inclined pipe-type h-shaped subsea online crude oil separation system Download PDFInfo
- Publication number
- LU501407B1 LU501407B1 LU501407A LU501407A LU501407B1 LU 501407 B1 LU501407 B1 LU 501407B1 LU 501407 A LU501407 A LU 501407A LU 501407 A LU501407 A LU 501407A LU 501407 B1 LU501407 B1 LU 501407B1
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- Prior art keywords
- stage
- pipe
- oil
- subsea
- gas
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- 239000010779 crude oil Substances 0.000 title claims abstract description 52
- 238000000926 separation method Methods 0.000 title claims abstract description 33
- 230000018044 dehydration Effects 0.000 claims abstract description 7
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims description 58
- 239000003921 oil Substances 0.000 claims description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 239000002351 wastewater Substances 0.000 claims description 22
- 239000000839 emulsion Substances 0.000 claims description 12
- 239000003129 oil well Substances 0.000 claims description 10
- 230000005684 electric field Effects 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 7
- 208000005156 Dehydration Diseases 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 6
- 239000000706 filtrate Substances 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 32
- 238000004519 manufacturing process Methods 0.000 description 10
- 239000013043 chemical agent Substances 0.000 description 7
- 238000007667 floating Methods 0.000 description 7
- 238000003860 storage Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 230000019491 signal transduction Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 241000191291 Abies alba Species 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 238000004581 coalescence Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- E21B43/34—Arrangements for separating materials produced by the well
-
- 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
- E21B43/34—Arrangements for separating materials produced by the well
- E21B43/36—Underwater separating arrangements
Landscapes
- 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)
- Pipeline Systems (AREA)
Abstract
The present invention provides an inclined pipe-type H-shaped subsea online crude oil separation system. The system features two-stage rapid separation of subsea crude oil, simplified oil-gas gathering and transportation flows, desirable online dehydration effect, low online wet gas contents, remote automatic control and the like.
Description
INCLINED PIPE-TYPE H-SHAPED SUBSEA ONLINE CRUDE OIL LUS01407
[01] The present invention relates to an online crude oil separation method for a subsea production system in the field of marine engineering, and in particular to an inclined pipe-type H-shaped subsea online crude oil separation system.
[02] In the process of development of offshore platform deepwater oil and gas fields, foreign researchers have proposed a separation solution to separate gravity settlement from water particle coalescence and growth. The dehydration technology is limited to offshore platforms and onshore oil and gas fields as it utilizes a horizontal electric coalescer, water particles which coalesce and grow in an electric field will be broken again due to shear action, thereby affecting the subsequent treatment processes such as gravity settlement and separation effects. Furthermore, only a few domestic scientific research institutes have been engaged in efficient and compact oil-water separation technology in recent years, among which research on compact electric dehydration technology for the offshore platforms is still at the experimental research stage, just like research on an online crude oil separation method for a subsea production system at home and abroad.
[03] In order to overcome the shortcomings in the prior art, the present invention provides an inclined pipe-type H-shaped subsea online crude oil separation system, including
[04] a first-stage pipe-type separator; wherein the first-stage pipe-type separator adopts an inclined thick-walled pipe and implements first-stage inclined pipe-type oil-gas-water pre-separation treatment to separate wet gas and most of water from crude oil produced from oil wells on a seabed, through which, wet oil-containing gas enters a gas-liquid separator through an exhaust pipe, oil-water two-phase crude oil is subjected to gravity settlement to complete first-stage separation of oil and water, first-stage wastewater is discharged through a first-stage wastewater pipe, and wet crude enters a mixer through a first-stage oil discharging pipe;
[05] the gas-liquid separator; wherein the gas-liquid separator adopts a thick-walled pipe arranged in a vertical direction, after the wet oil-containing gas is treated with two-stage filtrates, condensate oil finally flows back into a pipe cavity at a lower portion of the gas-liquid separator and is transported through a condensate oil manifold, and the wet gas is transported through a wet gas manifold;
[06] the mixer; where the mixer adopts a thick-walled pipe which is arranged in a vertical direction and a mixed-flow wheel;
[07] a second-stage pipe-type electric dehydrator; which uses array high-voltage bare electrodes and an inclined split thick-walled pipe to implement second-stage array high-voltage electric field deep dehydration treatment of crude oil; through which a 1 crude oil emulsion enters the second-stage pipe-type electric dehydrator through a LUS01407 second-stage oil inlet pipe, second-stage separation of oil and water is completed in an array high-voltage electric field, qualified crude oil is transported through a second-stage oil delivery manifold, and second-stage wastewater is discharged through a second-stage wastewater pipe; and
[08] a subsea online control system; where the subsea online control system enables remote automatic control over subsea online separation operation of all stages and guarantees flow safety thereof, and supply of oil well produced liquid and the crude oil emulsion, and discharging quantity and flow pressure of the wet gas, the condensate oil and the qualified crude oil are regulated and controlled through a subsea pressure control valve, a subsea liquid level control valve, a pressure pneumatic control valve, a pressure three-way solenoid valve, a liquid level pneumatic control valve, a liquid level three-way solenoid valve, a limit switch, and the like
[09] The present invention may realize technical effects that the subsea online crude oil separation system organically combines vertical and horizontal online crude oil separation with rapid dehydration process of the high-voltage electric field and the control system thereof, and finally realizes two-stage subsea crude oil rapid separation and simplifies oil-gas gathering and transportation flow; the first-stage pipe-type separator uses the inclined thick-walled pipe and implements first-stage inclined pipe-type oil-gas-water pre-separation treatment to separate the wet gas and most of water from the oil well produced liquid; the gas-liquid separator adopts the thick-walled pipe arranged in the vertical direction, and removes condensate oil droplets in the wet gas under the action of the two-stage filtrates; the mixer uses the thick-walled pipe arranged in the vertical direction and the mixed-flow wheel to fully stir and evenly mix the wet crude and a chemical agemt to form the crude oil emulsion; the second-stage pipe-type electric dehydrator uses the array high-voltage bare electrodes and the inclined split thick-walled pipe and implements second-stage array high-voltage electric field deep dehydration treatment to separate the remaining water from the crude oil; and the subsea online control system enables remote automatic control over subsea online separation operation of all stages and guarantees flow safety thereof, and the supply of the oil well produced liquid and the crude oil emulsion, and the discharging quantity and the flow pressure of the wet gas, the condensate oil and the qualified crude oil are regulated and controlled.
[10] FIG. 1 is a typical structural schematic diagram of an inclined pipe-type H-shaped subsea online crude oil separation system according to the present invention;
[11] FIG. 2 is a schematic diagram of an operation flow of the present invention;
[12] FIG. 3 is a flowchart of a subsea online separation process of the present invention;
[13] FIG. 4 is a control diagram of a pipeline and an instrument of a first-stage pipe-type separator in the present invention;
[14] FIG. 5 is a control diagram of a pipeline and an instrument of a gas-liquid separator in the present invention; 2
[15] FIG. 6 is a control diagram of a pipeline and an instrument of a mixer in the LU501407 present invention; and
[16] FIG. 7 is a control diagram of a pipeline and an instrument of a second-stage pipe-type electric dehydrator in the present invention.
[17] As shown in the figures, an inclined pipe-type H-shaped subsea online crude oil separation system is composed of a second-stage pipe-type electric dehydrator 1, a mixer 2, a gas-liquid separator 3, a first-stage pipe-type separator 4 and a subsea online control system.
[18] A first-stage oil inlet pipe 5 of the first-stage pipe-type separator 4 is connected to a subsea manifold and a subsea Christmas tree through a jumper pipe, a condensate oil manifold 6 of the gas-liquid separator 3 is connected to a condensate oil pipeline of a single-point liquid slip ring, a wet gas manifold 7 of the gas-liquid separator is connected to a single-point gas slip ring, and a high-voltage cable 9 of the second-stage pipe-type electric dehydrator 1 is connected to a single-point electric slip ring and provides high-voltage power. A chemical agent manifold 8 of the mixer 2 is connected to chemical agent pipes in an umbilical cable, a sand flushing manifold 11 of the first-stage pipe-type separator 4 is connected to a water delivery pipe in the umbilical cable and provides high-pressure fresh water, and sand-containing wastewwater after sand flushing is discharged through a sand discharge pipe 13. A second-stage oil delivery manifold 10 of the second-stage pipe-type electric dehydrator 1 is connected to a crude oil pipeline of the single-point liquid slip ring, such that qualified crude oil may enter crude oil settling tanks of a floating production storage offloading, and production wastewwater of stages after online separation treatment of two-stage crude oil enters a water delivery manifold through a first-stage wastewater pipe 14 and a second-stage wastewater pipe 12, respectively.
[19] The first-stage oil inlet pipe 5 of the first-stage pipe-type separator 4 is connected to the subsea manifold 20 and the subsea Christmas tree 21 through a subsea flowmeter, a subsea valve and the like respectively, and an exhaust pipe 16 of the first-stage pipe-type separator 4 is connected to the gas-liquid separator 3 through a subsea valve such as a pressure pneumatic control valve and a subsea flowmeter. A lower portion of the mixer 2 is connected to a first-stage oil discharging pipe 15 of the first-stage pipe-type separator 4 through subsea valves such as a liquid level pneumatic control valve and a subsea emergency shut-off valve, an upper portion of the mixer 2 is also connected to a second-stage oil inlet pipe 17 of the second-stage pipe-type electric dehydrator 1 through subsea valves such as a liquid level pneumatic control valve and a subsea emergency shut-off valve, the second-stage pipe-type electric dehydrator 1 is connected to a transformer 19 on the floating production storage offloading through the high-voltage cable 9, and the second-stage oil delivery manifold 10 is in parallel connection to a subsea pig 18.
[20] The subsea pig 18 is used for periodical pigging on subsea pipelines to clean up wax, hydrate and other blockages deposited in a subsea oil pipeline and an oil pipeline. During pigging, it is necessary to first close a communication pipeline between 3 the subsea oil pipeline and the second-stage oil delivery manifold 10 through subsea LU501407 valves such as a gate valve.
[21] According to an online subsea crude oil separation treatment flow, the first-stage pipe-type separator 4, the oil well produced liquid flows through the subsea manifold 20, an electromagnetic flowmeter 22, a subsea emergency shut-off valve 23, a ball valve, a subsea pressure control valve 24, a check valve and other subsea flowmeters and subsea valves in sequence, and is collected in the first-stage pipe-type separator 4. Wet oil-containing gas after two gas-liquid separations flows through the exhaust pipe 16 and through subsea valves such as a ball valve, the pressure pneumatic control valve 26 and a check valve in sequence to enter the gas-liquid separator 3, oil-water two-phase crude oil enters a pipe cavity in a middle of the first-stage pipe-type separator 4 for gravity settlement, water particles coalesce, grow and settle to a pipe wall, and then flow downstream to a pipe cavity at a lower portion along an inclined pipe wall, first-stage wastewater separated from the crude oil enters the water delivery manifold through the first-stage wastewater pipe 14 and subsea valves such as the subsea emergency shut-off valve 23, and wet crude enters the mixer 2 through the first-stage oil discharging pipe 15 and subsea valves such as the ball valve, the liquid level pneumatic control valve 28 and the check valve in sequence.
[22] The subsea online control system transmits a flow rate signal of the oil well produced liquid measured by the electromagnetic flowmeter 22 to an accumulated flow rate display instrument (FQI) in a central control room of the floating production storage offloading through a flow transmitter (FIT) in the subsea manifold 20, automatically closes and stops supply of the oil well produced liquid and transportation of the first-stage wastewater through the subsea emergency shut-off valves 23 on the subsea manifold 20 and the first-stage wastewater pipe 14 respectively, and automatically releases excess vent gas in the first-stage pipe-type separator 4 and adjusts pressure in the pipe cavity through a subsea pressure relief valve 25.
[23] The subsea online control system monitors pressure of the wet oil-containing gas and the qualified crude oil through a pressure gauge (PI) and a pressure transmitter (PIT), completes signal transduction and data processing through a pressure indication controller (PIC) and a pressure transducer (PY), and automatically regulates and controls the flow rate of the oil well produced liquid through the subsea pressure control valve 24 in the subsea manifold 20.
[24] According to a subsea gas-liquid separation treatment flow of the gas-liquid separator 3, the wet oil-containing gas flows through exhaust pipe 16 and the subsea valves such as the ball valve, an intelligent gas turbine flowmeter 32, a stop valve and a check valve in sequence, and enters into a pipe cavity of the gas-liquid separator 3 for retarding and pressure stabilizing, and then condensate oil droplets coalesce and grow continuously, finally flow back into the pipe cavity of the lower portion after being treated with two-stage filtrates, flow through the condensate oil manifold 6 and subsea valves such as the ball valve, the liquid level pneumatic control valve 28 and the check valve in sequence, and finally enter an oil tank of the floating production storage offloading. In addition, the wet gas flows through the wet gas manifold 7 and enters a fuel gas treatment system on the floating production storage offloading through subsea 4 flowmeters such as the ball valve, the subsea pressure control valve 24, an intelligent LU501407 gas orifice plate flowmeter 33 and the check valve in sequence.
[25] The subsea online control system transmits an wet oil-containing gas flow rate signal captured by the intelligent gas turbine flowmeter 32 in real time to the instantaneous flow rate display instrument(FI) and the accumulated flow rate display instrument (FQI) in the central control room through a flow transmitter (FIT) at an inlet of the gas-liquid separator 3. Through an instantaneous pressure transmitter(PT), a flow transmitter (FIT) and a temperature transmitter (TT) in the wet gas manifold 7, wet gas pressure, a flow rate and a temperature signal measured in real time by the intelligent gas orifice plate flowmeter 33 are transmitted collectively to the accumulated flow rate display instrument (FQI) in the central control room, and the excess vent gas in the gas-liquid separator 3 is automatically released through the subsea pressure relief valve 25 and the pressure in the pipe cavity is adjusted.
[26] The subsea online control system monitors the pressure of the wet gas through the pressure transmitter (PIT), and completes signal transduction and data processing through the pressure indication controller (PIC) and the pressure transducer (PY) in sequence, and automatically regulates and controls the flow rate of the wet gas through the subsea pressure control valve 24 in the wet gas manifold 7.
[27] According to a subsea operation flow of the mixer 2, the wet crude flows into the mixer 2 through the subsea emergency shut-off valve 23, and is adjusted to a stable flow by the mixed-flow wheel of the mixer 2. A chemical agent flows from the chemical agent manifold 8 through subsea valves such as the ball valve, the subsea pressure control valve 24, the stop valve and the check valve in sequence, and enter a pipe cavity of the mixer 2, and the wet crude and the chemical agent are fully stirred and mixed through the mixed-flow wheel to form a crude oil emulsion. Finally, the crude oil emulsion is adjusted to a stable flow again through the mixed-flow wheel in an outlet section of the pipe cavity of the mixer 2, and then enters the second-stage pipe-type electric dehydrator 1 through the subsea valves such as the ball valve, the liquid level pneumatic control valve 28 and the check valve in sequence.
[28] The subsea online control system automatically closes and stops supply of the wet crude through a subsea emergency shut-off valve 23 at an inlet of the mixer 2, monitors the pressure of the qualified crude oil through the pressure gauge (PI) and the pressure transmitter (PIT) on the second-stage pipe-type electric dehydrator 1, completes signal transduction and data processing through the pressure indication controller (PIC) and the pressure transducer (PY) in sequence, and automatically regulates and controls a flow rate of the chemical agent through the subsea pressure control valve 24 in the chemical agent manifold 8. In addition, a liquid level of the second-stage wastewater in the pipe cavity of the second-stage pipe-type electric dehydrator is monitored by a liquid level meter (LI) and a liquid level transmitter (LIT) on the second-stage pipe-type electric dehydrator 1, and the liquid level pneumatic control valve 28 is driven by a liquid level indication controller (LIC), a pneumatic-electronic signal transducer (LY) and a liquid level three-way solenoid valve 29 to automatically regulate and control a flow rate of the crude oil emulsion.
[29] According to an online subsea crude oil separation treatment flow, the second-stage pipe-type electric dehydrator 1, the crude oil emulsion flows through LU501407 subsea valves such as the subsea emergency shut-off valve 23 and enters a pipe cavity of an upper portion of the second-stage pipe-type electric dehydrator 1 from the second-stage oil inlet pipe 17, and water particles of the crude oil emulsion in an array high-voltage electric field rapidly coalesce and grow up and settle to a middle pipe cavity, then continue to grow and settle to a pipe wall under the action of gravity, and then flow downstream to a pipe cavity of a lower portion along an inclined pipe wall. Separated second-stage wastewater passes through the second-stage wastewater pipe 12 and flows through subsea valves such as the ball valve, the subsea liquid level control valve 34, the subsea emergency shut-off valve 23 and the check valve in sequence, and enters the water delivery manifold. In addition, the qualified crude oil passes through the second-stage oil delivery manifold 10 and enters the crude oil settling tanks of the floating production storage offloading through subsea valves such as the ball valve, the intelligent liquid turbine flowmeter 36, the stop valve and the check valve.
[30] The subsea online control system transmits a qualified crude oil flow signal captured by the intelligent liquid turbine flowmeter 36 in real time to the instantaneous flow rate display instrument(FI) and the accumulated flow rate display instrument (FQI) in the central control room of the floating production storage offloading through a flow transmitter (FIT) in the second-stage oil delivery manifold 10, and automatically closes and stops supply of the crude oil emulsion and transportation of the second-stage wastewater through the subsea emergency shut-off valves 23 at the inlet of the second-stage pipe-type electric dehydrator 1 and on the second-stage wastewater pipe 12 respectively, and recess vent gas in the second-stage pipe-type electric dehydrator 1 is automatically released by the subsea pressure relief valve 25 and the pressure in the pipe cavity is adjusted.
[31] The subsea online control system monitors the liquid level of the second-stage wastewater through the liquid level (LI) and the liquid level transmitter (LIT) on the second-stage pipe-type electric dehydrator 1, completes signal transduction and data processing through the liquid level indication controller (LIC) and the liquid level transducer (LY) in sequence, and automatically regulates and controls a flow rate of the second-stage wastewater through the subsea liquid level control valve 34 on the second-stage wastewater pipe 12. In addition, the liquid level of the qualified crude oil is monitored in real time by a limit switch 35(LS) between the high-voltage cable 9 and array high-voltage bare electrodes, and then start and stop of the transformer 19 are automatically controlled.
6
Claims (1)
1. An inclined pipe-type H-shaped subsea online crude oil separation system, comprising a first-stage pipe-type separator; wherein the first-stage pipe-type separator applies an inclined thick-walled pipe and implements first-stage inclined pipe-type oil-gas-water pre-separation treatment to separate wet gas and most of water from crude oil produced from oil wells on a seabed, through which, wet oil-containing gas enters a gas-liquid separator through an exhaust pipe, oil-water two-phase crude oil is subjected to gravity settlement to complete first-stage separation of oil and water, first-stage wastewater is discharged through a first-stage wastewater pipe, and wet crude enters a mixer through a first-stage oil discharging pipe; the gas-liquid separator; wherein the gas-liquid separator uses a thick-walled pipe arranged in a vertical direction, after the wet oil-containing gas is treated with two-stage filtrates, condensate oil finally flows back into a pipe cavity at a lower portion of the gas-liquid separator and is transported through a condensate oil manifold, and the wet gas is transported through a wet gas manifold; the mixer; wherein the mixer uses a thick-walled pipe which is arranged in a vertical direction and a mixed-flow wheel; a second-stage pipe-type electric dehydrator; which uses array high-voltage bare electrodes and an inclined split thick-walled pipe to implement second-stage array high-voltage electric field deep dehydration treatment of crude oil; through which a crude oil emulsion enters the second-stage pipe-type electric dehydrator through a second-stage oil inlet pipe, second-stage separation of oil and water is completed in an array high-voltage electric field, qualified crude oil is transported through a second-stage oil delivery manifold, and second-stage wastewater is discharged through a second-stage wastewater pipe; and a subsea online control system; wherein the subsea online control system enables remote automatic control over subsea online separation operation of all stages and guarantees flow safety thereof, and supply of oil well produced liquid and the crude oil emulsion, and discharging quantity and flow pressure of the wet gas, the condensate oil and the qualified crude oil are regulated and controlled through a subsea pressure control valve, a subsea liquid level control valve, a pressure pneumatic control valve, a pressure three-way solenoid valve, a liquid level pneumatic control valve, a liquid level three-way solenoid valve, a limit switch and the like.
1
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU501407A LU501407B1 (en) | 2022-02-08 | 2022-02-08 | Inclined pipe-type h-shaped subsea online crude oil separation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU501407A LU501407B1 (en) | 2022-02-08 | 2022-02-08 | Inclined pipe-type h-shaped subsea online crude oil separation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| LU501407B1 true LU501407B1 (en) | 2022-08-11 |
Family
ID=82848764
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU501407A LU501407B1 (en) | 2022-02-08 | 2022-02-08 | Inclined pipe-type h-shaped subsea online crude oil separation system |
Country Status (1)
| Country | Link |
|---|---|
| LU (1) | LU501407B1 (en) |
-
2022
- 2022-02-08 LU LU501407A patent/LU501407B1/en active IP Right Grant
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| Date | Code | Title | Description |
|---|---|---|---|
| FG | Patent granted |
Effective date: 20220811 |