CN103603637A - Experimental device and system for exploiting super heavy oil by gas-assisted SAGD (steam assisted gravity drainage) - Google Patents
Experimental device and system for exploiting super heavy oil by gas-assisted SAGD (steam assisted gravity drainage) Download PDFInfo
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- CN103603637A CN103603637A CN201310516243.6A CN201310516243A CN103603637A CN 103603637 A CN103603637 A CN 103603637A CN 201310516243 A CN201310516243 A CN 201310516243A CN 103603637 A CN103603637 A CN 103603637A
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- 238000010796 Steam-assisted gravity drainage Methods 0.000 title claims abstract description 62
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- 239000007924 injection Substances 0.000 claims abstract description 41
- 238000004519 manufacturing process Methods 0.000 claims abstract description 31
- 239000012530 fluid Substances 0.000 claims abstract description 20
- 238000012545 processing Methods 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims description 26
- 238000004088 simulation Methods 0.000 claims description 26
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- 238000009413 insulation Methods 0.000 claims description 10
- 238000010793 Steam injection (oil industry) Methods 0.000 claims description 5
- 238000009529 body temperature measurement Methods 0.000 claims description 4
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- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
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- 238000010586 diagram Methods 0.000 description 3
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Abstract
The invention discloses an experimental device and system for exploiting super-thick oil by gas-assisted SAGD (steam assisted gravity drainage), wherein the system comprises: the device comprises an experimental device, a multi-element injection device, a data acquisition device and a production device; the multi-element injection device, the data acquisition and processing module and the production device are connected to the experimental device; wherein, the experimental apparatus includes: a model box and a hyperbaric chamber for simulating a reservoir in production; the multi-element injection device is used for injecting steam and fluid into the experimental device; the production device is used for receiving the fluid produced by the experimental device; the data acquisition device is used for acquiring and recording experimental data.
Description
Technical Field
The invention belongs to the field of indoor experiments of oil development, and particularly relates to an experimental device and system for exploiting super-thick oil by gas-assisted SAGD (steam assisted gravity drainage).
Background
Steam Assisted Gravity Drainage (SAGD) technology is a method of producing super heavy oil and bitumen. The method generally adopts two parallel horizontal wells, the length of the horizontal section of each horizontal well is generally 500-750 m, the upper part of each horizontal well is a horizontal injection well, the lower part of each horizontal well is a horizontal production well, or in some practical applications, multiple vertical wells are adopted for injection, the wells are positioned 3-7 m above the production wells, and the horizontal production wells are generally close to the bottom of an oil reservoir. The injected steam forms a steam cavity above the injection well and the heated crude oil is driven by gravity towards the production well. This is a continuous process, with the steam cavity expanding toward the flanks as it reaches the top of the reservoir.
At present, most of the SAGD mining modes implemented in the early stage enter the middle and later stages of SAGD, and the focus of people on how to prolong the production time, improve the development effect and improve the economic benefit is concerned. Steam assisted gravity drainage field tests of certain oil reservoirs in China have been successful, but the oil reservoirs are oval on the plane, and the oil layers are thinned from the middle to the periphery and are directly contacted with edge water. The top of the oil reservoir is buried deeply for 530-640 m, a pure mudstone interlayer is not arranged between an oil layer and top water, only about 3m of asphalt shells are arranged, and the oil layer belongs to a side-top-bottom water oil reservoir.
Disclosure of Invention
Data monitored in the process of extracting the SAGD in the prior art are found, because the steam cavity expands upwards and quickly under the super-covering effect of the steam, the asphalt shell is easy to melt, the top water is leaked downwards, and the development effect of the SAGD is seriously influenced.
The invention provides a gas-assisted SAGD (steam assisted gravity drainage) development technology aiming at the particularity of an oil reservoir, and the specific method is to add a proper non-condensable gas (such as N) in the SAGD process2、CO2、CH4Etc.), a heat insulating layer is formed between the steam cavity and the top of the oil layer, so that the heat transfer speed of steam to the overlying strata is reduced, and the drainage time of top water is prolonged; meanwhile, the non-condensed gas injected together with the steam can play a role in reducing the steam partial pressure, so that the steam cavity is further expanded in the transverse direction, and data support is provided for researching an effective development technology of the super heavy oil reservoir, which is used for improving the SAGD heat efficiency, increasing the steam swept volume and further improving the oil-steam ratio.
In order to achieve the above object, the present invention provides an experimental apparatus for gas-assisted SAGD to recover ultra-thick oil, comprising: a model box and a high-pressure cabin; in the experiment, the model box is fixed in the cabin body; wherein the mold box comprises: the system comprises a box body, a vacuum heat insulation layer, a horizontal well simulation well mouth, a vertical well simulation well mouth, a sand filling mouth, a temperature measuring hole, a double-horizontal well SAGD well pattern and an 8-shaped circulation preheating well pattern; the horizontal well simulation well head and the temperature measurement hole are arranged on the side surface of the box body, a cavity is formed inside the box body, and the double-horizontal well SAGD well pattern and the 8-shaped circulating preheating well pattern are arranged in the cavity; the hyperbaric chamber comprises: the cabin body comprises a left end cover of the cabin body, a right end cover of the cabin body, a connecting bolt and a heating device; the cabin body left end cover and the cabin body right end cover are respectively connected with the cabin body through the connecting bolts, the inside of the cabin body is provided with another cavity, and the heating device is arranged in the cabin body.
In order to achieve the above object, the present invention provides an experimental system for producing super heavy oil by gas-assisted SAGD, comprising: the device comprises an experimental device, a multi-element injection device, a data acquisition device and a production device; the multi-element injection device, the data acquisition and processing module and the production device are connected to the experimental device; wherein, the experimental apparatus is used for simulating the reservoir in exploitation, including: a model box and a high-pressure cabin; in the experiment, the model box is fixed in the cabin body; wherein the mold box comprises: the system comprises a box body, a vacuum heat insulation layer, a horizontal well simulation well mouth, a vertical well simulation well mouth, a sand filling mouth, a temperature measuring hole, a double-horizontal well SAGD well pattern and an 8-shaped circulation preheating well pattern; the horizontal well simulation well head and the temperature measurement hole are arranged on the side surface of the box body, a cavity is formed inside the box body, and the double-horizontal well SAGD well pattern and the 8-shaped circulating preheating well pattern are arranged in the cavity; the hyperbaric chamber comprises: the cabin body comprises a left end cover of the cabin body, a right end cover of the cabin body, a connecting bolt and a heating device; the cabin body is connected with the left end cover and the right end cover through the connecting bolts, the other cavity is arranged in the cabin body, and the heating device is arranged in the cabin body; the multi-element injection device is used for injecting steam and fluid into the experimental device; the production device is used for receiving the fluid produced by the experimental device; the data acquisition device is used for acquiring and recording experimental data.
The experimental device and the system for exploiting the super-heavy oil by the gas-assisted SAGD can accurately simulate the characteristic that when a certain amount of gas is added in the SAGD process, the upper expansion speed of the steam cavity is partially inhibited, an effective gas heat insulation layer is formed, the heat loss of steam to an overlying rock layer is prevented, the steam cavity is forced to expand towards the flank, the volume of the steam cavity is increased, the change rule of a temperature field in the expansion process of the steam cavity is conveniently measured, data support is provided for researching and improving the thermal efficiency of the SAGD, increasing the steam wave and the volume, further improving the effective development technology of the super-heavy oil reservoir with the oil-gas ratio, and subsequent theoretical research and numerical simulation research are facilitated.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic view of a mold box according to an embodiment of the present invention.
Fig. 2 is a schematic view showing the structure of a hyperbaric chamber according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of an experimental system according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of an experimental system according to an embodiment of the present invention.
Detailed Description
The technical means adopted by the invention to achieve the predetermined object of the invention are further described below with reference to the drawings and the preferred embodiments of the invention.
Fig. 1 is a schematic structural view of a mold box according to an embodiment of the present invention, and fig. 2 is a schematic structural view of a hyperbaric chamber according to an embodiment of the present invention. Referring to fig. 1 and 2, the experimental apparatus of the present invention is used for simulating a reservoir in production, and includes: a mold box 10 and a hyperbaric chamber 11; in conducting the experiment, the mold box 10 was secured within the nacelle 112. Wherein,
the mold box 10 includes: the system comprises a box body 101, a vacuum heat insulation layer 102, 5 horizontal well simulation well mouths, a vertical well simulation well mouth 104, a sand filling mouth 105, a temperature measuring hole 106, an 8-shaped circulation preheating well pattern 107 and a double-horizontal well SAGD well pattern 108.
The box body 101 is made of stainless steel, the highest working temperature is 350 ℃, and the highest working pressure difference which can be resisted is 1 MPa. The box body 101 is provided with a vacuum heat insulation layer 102, a cavity inside the box body 101 is sealed by the vacuum heat insulation layer 102, and the vacuum heat insulation layer 102 can reduce the influence of the external environment on an internal temperature field in the experiment process. The cavity can be used to contain an experimental fluid, such as steam. Be provided with 8 font circulation in the cavity of box 101 and preheat well pattern 107 and two horizontal well SAGD well pattern 108, wherein, two horizontal well SAGD well pattern 108 include: the horizontal SAGD well pattern 108a and the horizontal SAGD well pattern 108b can well simulate well arrangement modes in actual oil reservoirs; the 8-shaped circulation preheating well pattern 107 is used for preheating the periphery of the double-horizontal-well SAGD well pattern 108 in the SAGD starting stage, so that good production can be achieved in the SAGD production stage. A vertical well simulation wellhead 104 and a sand filling wellhead 105 are arranged on the box body 101, and the vertical well simulation wellhead 104 is used for simulating different well arrangement modes; the number of the sand filling openings 105 is 2, the sand filling openings are mainly used for filling quartz sand into the model box 10, and the 2 sand filling openings 105 are sealed by bolts, so that the sealing performance of the model is well guaranteed. The side of box 101 is provided with 5 horizontal well simulation wellheads, includes: the horizontal well simulation wellhead 103a, the horizontal well simulation wellhead 103b, the horizontal well simulation wellhead 103c, the horizontal well simulation wellhead 103d and the horizontal well simulation wellhead 103e are mainly used for saturated oil. The side of the box 101 is also provided with a plurality of temperature measuring holes 106, in which thermocouples can be installed to measure the temperature of the fluid in the cavity in real time.
The mold box 10 is a one-piece unit except for two sand-packing ports 105 above it to allow sand packing, so that the cavity is a stable sealed cavity.
The high-pressure cabin 11 is horizontally placed, and includes: a cabin left end cover 111, a cabin 112, a cabin right end cover 113, a connecting bolt 114 and a heating device 115; the left cabin end cover 111 and the right cabin end cover 112 are both of a hemispherical structure and are connected with the cabin 112 through connecting bolts 114 respectively; the cabin 112 is provided with another cavity therein, and the cavity is filled with gas for simulating the surrounding pressure of the actual oil reservoir; the heating device 114 is disposed within the enclosure 112.
In this embodiment, the hyperbaric chamber 11 further comprises: a steam injection hole 116, a first pressure gauge 117 and a temperature thermocouple 118; the temperature thermocouple 118 is arranged on the left end cover 111 of the cabin body and is used for monitoring the temperature in the cavity of the hyperbaric cabin 11; the gas injection holes 116 are arranged on the right end cover 113 of the cabin body, and gas simulating the surrounding pressure of an actual oil reservoir in the cabin body 112 is injected through the gas injection holes 116; a first pressure gauge 117 is disposed on the cabin body for monitoring the gas pressure in the cavity of the hyperbaric chamber 11;
in the present embodiment, the heating means 114 comprises three heating plates, which are mainly used for adjusting the temperature inside the cavity of the hyperbaric chamber 11 so that the temperature is kept constant; in the experiment, one heating plate was disposed under the mold box 10, and the other two heating plates were disposed on both sides of the mold box 10.
Fig. 3 is a schematic structural diagram of an experimental system according to an embodiment of the present invention. As shown in fig. 3, the experimental system of the present embodiment includes: an experimental device 1, a multi-element injection device 2, a production device 3 and a data acquisition device 4 shown in fig. 1 and 2; the multi-element injection device 1, the production device 3 and the data acquisition device 4 are connected to the experimental device 1; wherein,
the experimental device 1 is used for simulating a reservoir in production, is described in the above fig. 1 and 2, and is not described herein again; a multi-element injection device 2 for injecting steam and fluid into the experimental device 1; a production device 3 for receiving the fluid produced by the experimental device 1; and the data acquisition device 4 is used for acquiring and recording experimental data.
In the present embodiment, the multi-injection device 2 includes: a first injection pump 20, a first steam generator 21, a first back pressure valve 22, a second pressure gauge 23, a gas cylinder 24, a dryer 25, a gas mass flow meter 26 and a one-way valve 27; wherein,
the first injection pump 20 is connected with the first steam generator 21, the first steam generator 21 is connected with the first back pressure valve 22, the first back pressure valve 22 is connected with the second pressure gauge 23, the gas cylinder 24 is connected with the dryer 25, the dryer 25 is connected with the gas mass flow meter 26, the gas mass flow meter 26 is connected with the check valve 27, and the check valve 27 and the first steam generator 21 are connected to the model box 10 through injection pipelines.
In this embodiment, the multi-element injection device 2 further includes: a second injection pump 28, a second steam generator 29; wherein the second injection pump 28 is connected to a second steam generator 29, and the second steam generator 29 is connected to the mold box 10 through a heat tracing line.
In the present embodiment, the production apparatus 3 includes: a second back pressure valve 31, a beaker 32, a third pressure gauge 33; wherein, the third pressure gauge 33 is connected to the second back pressure valve 31, the second back pressure valve 31 is connected to the model box 10 through the output pipeline, and the beaker 32 is used for receiving the fluid output by the second back pressure valve 31.
In the multi-element injection device 2 of the embodiment, the equipment of the first injection pump 20 is provided with an air bottle 24 and other equipment compared with the equipment of the second injection pump 28, and the function of the equipment is that after the SAGD start stage is finished and enters the production stage, the equipment is used for injecting fluid into the SAGD well network containing the double horizontal wells to produce SAGD.
The function of the equipment in the way of the second injection pump 28 is to generally inject hot water fluid, the injected fluid flows to the 8-shaped circulating preheating well pattern 107 and is mainly used for preheating the periphery of the SAGD well pattern in the SAGD starting stage, so that the SAGD production stage can well produce the SAGD well pattern.
In the present embodiment, the production apparatus 3 further includes: heating the centrifuge; the heating centrifugal machine is used for carrying out solid-liquid separation on the produced fluid.
In the present embodiment, the data acquisition device 4 includes: a data acquisition processing module 41, a pressure sensor and a temperature sensor; wherein, the pressure sensor and the temperature sensor are arranged in the model box 10, and the pressure sensor and the temperature sensor are connected with the data acquisition processing module 41 through the high-pressure cabin 11; the data acquisition and processing module 41 is used for integrating data, and displaying and recording experimental data. In addition, the hyperbaric chamber 11 may be further provided with a pressure display meter and a temperature display meter, which are respectively connected to the pressure sensor and the temperature sensor for displaying a real-time pressure value or a temperature value.
By the experimental system of the embodiment, the pressure inside the model box is tracked in real time, and the model pressing plate is kept not to deform; in one embodiment, there are 63 thermocouples, thermocouple specification: phi 1.2mm multiplied by 2000mm belt joint and 3m compensation lead ensure that the temperature field in the mould box 10 is effectively monitored in the experimental process, so that the operation parameters of the system meet the experimental requirements.
The following description is made with reference to fig. 1 to 4, and the experimental flow of the experimental apparatus and system for producing ultra-thick oil by using gas-assisted SAGD according to the present invention is shown.
In step S501, glass beads are loaded into the mold box 10 from the sand filling port 105.
Step S502, saturated water of a rock core: the model box 10 filled with the glass beads is vacuumized from the horizontal well simulated wellhead 103a, and after the vacuumization is finished, the model box 10 filled with the glass beads is saturated by water absorption from the horizontal well simulated wellhead 103 e.
Step S503, core saturated oil: crude oil is injected from the horizontal well simulation wellhead 103c, and crude oil is produced from the horizontal well simulation wellheads 103b and 103 d.
In step S504, hot water of 120 ℃ is injected into the 8-shaped circulation preheating well pattern 107 by using the second injection pump 28 and the second steam generator 29 to ensure sufficient preheating around the injection well. The hot water injection rate is 30ml/min, the preheating time lasts for 1 hour, and after the temperature around the injection well reaches about 100 ℃, the SAGD production mode is started.
Step S505, carrying out an SAGD core displacement experiment; a first injection pump 20 and a first steam generator 21 are used to inject hot fluid into the dual horizontal well SAGD well pattern 108. When the temperature of the first steam generator 21 is raised to the experimental temperature of 200 ℃, a bypass pipeline connected with a first back pressure valve 22 and a second pressure gauge 23 is opened to enable the hot fluid to be smoothly and stably passed through the bypass pipeline, then the bypass pipeline is closed, and the hot fluid smoothly and stably passed through the bypass pipeline is injected into the double-horizontal-well SAGD well pattern 108 from the horizontal-well SAGD well pattern 108 a; and (3) carrying out an SAGD experiment, collecting produced liquid from the horizontal well SAGD well pattern 108b by using the beaker 32, collecting and recording temperature and pressure by using the data acquisition device 4, recording injection and produced data, and being used for controlling the experimental device.
The experimental device and the system for exploiting the super-heavy oil by the gas-assisted SAGD can accurately simulate the characteristic that when a certain amount of gas is added in the SAGD process, the upper expansion speed of the steam cavity is partially inhibited, an effective gas heat insulation layer is formed, the heat loss of steam to an overlying rock layer is prevented, the steam cavity is forced to expand towards the flank, the volume of the steam cavity is increased, the change rule of a temperature field in the expansion process of the steam cavity is conveniently measured, data support is provided for researching and improving the thermal efficiency of the SAGD, increasing the steam wave and the volume, further improving the effective development technology of the super-heavy oil reservoir with the oil-gas ratio, and subsequent theoretical research and numerical simulation research are facilitated.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (13)
1. An experimental device for exploiting super heavy oil by gas-assisted SAGD (steam assisted gravity drainage), which is characterized by comprising: a model box and a high-pressure cabin; in the experiment, the model box is fixed in the cabin body; wherein,
the mold box comprises: the system comprises a box body, a vacuum heat insulation layer, a horizontal well simulation well mouth, a vertical well simulation well mouth, a sand filling mouth, a temperature measuring hole, a double-horizontal well SAGD well pattern and an 8-shaped circulation preheating well pattern; the horizontal well simulation well head and the temperature measurement hole are arranged on the side surface of the box body, a cavity is formed inside the box body, and the double-horizontal well SAGD well pattern and the 8-shaped circulating preheating well pattern are arranged in the cavity;
the hyperbaric chamber comprises: the cabin body comprises a left end cover of the cabin body, a right end cover of the cabin body, a connecting bolt and a heating device; the cabin body left end cover and the cabin body right end cover are respectively connected with the cabin body through the connecting bolts, the inside of the cabin body is provided with another cavity, and the heating device is arranged in the cabin body.
2. The experimental facility of claim 1, wherein the hyperbaric chamber further comprises: the temperature measuring thermocouple, the first pressure gauge and the steam injection hole;
the temperature thermocouple is arranged on the left end cover of the cabin body, the steam injection hole is arranged on the right end cover of the cabin body, and the first pressure gauge is arranged on the cabin body.
3. The experimental device of claim 1, wherein the box body is made of stainless steel, and can resist the highest working pressure difference of 1MPa and the highest working temperature of 350 ℃.
4. The experimental setup of claim 1, wherein the heating setup comprises three heating plates, one heating plate being disposed under the mold box and two heating plates being disposed on two sides of the mold box respectively when performing the experiment.
5. An experimental system for exploiting ultra-thick oil through gas-assisted SAGD (steam assisted gravity drainage), which is characterized by comprising: the device comprises an experimental device, a multi-element injection device, a data acquisition device and a production device; the multi-element injection device, the data acquisition and processing module and the production device are connected to the experimental device; wherein,
the experimental apparatus is used for simulating a reservoir in production, and comprises: a model box and a high-pressure cabin; in the experiment, the model box is fixed in the cabin body; wherein,
the mold box comprises: the system comprises a box body, a vacuum heat insulation layer, a horizontal well simulation well mouth, a vertical well simulation well mouth, a sand filling mouth, a temperature measuring hole, a double-horizontal well SAGD well pattern and an 8-shaped circulation preheating well pattern; the horizontal well simulation well head and the temperature measurement hole are arranged on the side surface of the box body, a cavity is formed inside the box body, and the double-horizontal well SAGD well pattern and the 8-shaped circulating preheating well pattern are arranged in the cavity;
the hyperbaric chamber comprises: the cabin body comprises a left end cover of the cabin body, a right end cover of the cabin body, a connecting bolt and a heating device; the cabin body is connected with the left end cover and the right end cover through the connecting bolts, the other cavity is arranged in the cabin body, and the heating device is arranged in the cabin body;
the multi-element injection device is used for injecting steam and fluid into the experimental device;
the production device is used for receiving the fluid produced by the experimental device;
the data acquisition device is used for acquiring and recording experimental data.
6. The experimental system of claim 5, wherein the hyperbaric chamber further comprises: the temperature measuring thermocouple, the first pressure gauge and the steam injection hole;
the temperature thermocouple is arranged on the left end cover of the cabin body, the steam injection hole is arranged on the right end cover of the cabin body, and the first pressure gauge is arranged on the cabin body.
7. The experimental system of claim 5, wherein the box body is made of stainless steel, and can resist the highest working pressure difference of 1MPa and the highest working temperature of 350 ℃.
8. The testing system of claim 5, wherein the heating means is three heating plates, one heating plate being disposed below the mold box and two heating plates being disposed on either side of the mold box during the testing.
9. The assay system of claim 5, wherein the multi-element injection device comprises: the system comprises a first injection pump, a first steam generator, a first back pressure valve, a second pressure gauge, a gas cylinder, a dryer, a gas mass flowmeter and a one-way valve; wherein,
first injection pump connects first steam generator, first steam generator connects first back pressure valve, second manometer is connected to first back pressure valve, the gas cylinder is connected the desicator, gaseous mass flow meter is connected to the desicator, gaseous mass flow meter connects the check valve, check valve and first steam generator are connected to through the injection pipeline the model case.
10. The experimental system of claim 9, wherein said multi-element injection device further comprises: a second injection pump, a second steam generator; wherein,
the second injection pump is connected with a second steam generator, and the second steam generator is connected to the model box through a heat tracing pipeline.
11. The assay system of claim 5, wherein the production device comprises: a second back pressure valve, a beaker and a third pressure gauge; wherein,
the third pressure gauge is connected with a second back-pressure valve, the second back-pressure valve is connected with the model box through a production pipeline, and the beaker is used for receiving the fluid produced by the second back-pressure valve.
12. The assay system of claim 11, wherein the production device further comprises: heating the centrifuge; the heating centrifugal machine is used for carrying out solid-liquid separation on the produced fluid.
13. The assay system of claim 5, wherein the data acquisition device comprises: the device comprises a pressure sensor, a temperature sensor and a data acquisition and processing module; wherein,
the pressure sensor and the temperature sensor are arranged in the model box and connected with the data acquisition and processing module.
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