CN107989586B - Coal bed gas well remodeling method based on the compound surge formula pressurized water injection of controllable shock wave - Google Patents
Coal bed gas well remodeling method based on the compound surge formula pressurized water injection of controllable shock wave Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 130
- 239000003245 coal Substances 0.000 title claims abstract description 93
- 230000035939 shock Effects 0.000 title claims abstract description 86
- 238000002347 injection Methods 0.000 title claims abstract description 73
- 239000007924 injection Substances 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 39
- 150000001875 compounds Chemical class 0.000 title claims abstract description 24
- 238000007634 remodeling Methods 0.000 title claims abstract description 15
- 238000005065 mining Methods 0.000 claims abstract description 15
- 230000006835 compression Effects 0.000 claims abstract description 14
- 238000007906 compression Methods 0.000 claims abstract description 14
- 238000009434 installation Methods 0.000 claims description 9
- 230000009466 transformation Effects 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 238000000605 extraction Methods 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000003116 impacting effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000005325 percolation Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/006—Production of coal-bed methane
Abstract
The invention belongs to energy extraction technical field, the coal bed gas well remodeling method based on the compound surge formula pressurized water injection of controllable shock wave is disclosed, its object is to solve the problems, such as that existing coal seam remodeling method damages coal seam and correctional effect is undesirable.The following steps are included: 1) install well head four-way and cable blowout control device, wherein well head four-way lower end is connect with well head, and upper end is connect with cable blowout control device, and the first side port connects high pressure water injection pipeline, and the second side port connects pressure gauge；2) controllable shock wave equipment is generated to pass through in cable blowout control device lower going-into-well；3) cable blowout control device is closed, is filled the water into coal bed gas well, after water injection pressure reaches the compression strength in coal seam, starts controllable shock wave and generates the compound surge formula water filling pressurization operation of equipment progress shock wave；4) after completing all settings, well head four-way and wellhead cable preventer are opened, acts controllable shock wave and generates equipment；5) water pump, water pipe and the bar that draws water under put into mining according to mining technique.
Description
Technical field
The invention belongs to energy extraction technical fields, and in particular to based on the compound surge formula pressurized water injection of controllable shock wave
Coal bed gas well remodeling method.
Background technique
Coal bed gas cause is the cause of national active support, 10,000,000,000 m of methane output of whole nation planning in 20103, wherein
5,000,000,000 m of ground pump drainage3, 5,000,000,000 m of tunnel pump drainage3.Tunnel pump drainage has reached planning yield, since coal seam transformation and oil/gas well stimulation are arranged
Planning yield has not yet been reached in the limitation applied, ground pump drainage.
Since 80% coal bed gas is with adsorbed state there are in coal seam, in order to realize commercial mining and the quickening of coal bed gas
The pump drainage speed of coal bed gas, needs to be transformed coal seam in mine.Current coal seam remodeling method has been continued to use oil reservoir substantially and has been changed
The traditional handicraft made, using hydraulic fracturing as main method.These traditional methods have the disadvantage in that
Firstly, the method in tradition transformation coal seam is all that need to inject foreign liquid to stratum, coal seam will necessarily be damaged；
Secondly, the static pressure because of hydraulic fracturing may be such that coal seam is compacted, coal bed gas well is caused not produce gas；Third, hydraulic fracturing measure
It often can be only formed " threadiness " or imperfect " netted " coal seam reservoirs correctional effect, be actually unable to reach area truly
Domain anatonosis, it is more difficult to spread the sand of supporting crack into coal seam fracture.
Summary of the invention
The purpose of the present invention is to provide a kind of coal bed gas wells based on the compound surge formula pressurized water injection of controllable shock wave to change
Method is made, the shortcomings that overcome above-mentioned conventional method.It proposes a kind of based on the controllable compound surge formula pressurized water injection of shock wave of repetition
Ground extraction coal bed gas well remodeling method, this method in the case where not injuring coal seam, improve coal seam percolation ability, parsing
Ability and the adsorption capacity again for inhibiting coal seam, it is final to improve coal bed gas well yield and production capacity.
The technical solution of the invention is as follows: the coal bed gas well transformation based on the compound surge formula pressurized water injection of controllable shock wave
Method, be characterized in that the following steps are included:
1) well head four-way and cable blowout control device are installed, wherein well head four-way lower end is connect with well head, upper end and cable blowout control
Device connection, the first side port connect high pressure water injection pipeline, and the second side port connects pressure gauge；
2) controllable shock wave equipment is generated to pass through in cable blowout control device lower going-into-well；
3) cable blowout control device is closed, is filled the water into coal bed gas well, after water injection pressure reaches the compression strength in coal seam, starting
Controllable shock wave generates equipment and carries out the compound surge formula water filling pressurization operation of shock wave；
4) after completing all settings, well head four-way and wellhead cable preventer are opened, acts controllable shock wave generation and sets
It is standby；
5) water pump, water pipe and the bar that draws water under put into mining according to mining technique；
Wherein the step 3) is specific as follows:
Close well head cable blowout control device；
3.1) it is filled the water by high pressure water injection pipeline into coal bed gas well, after water injection pressure reaches the compression strength in coal seam,
Stop pressurizeing and recording water injection rate, starts shock wave operation；
3.2) stop after every shock wave operation for completing setting number, record a well head pressure every fixed duration, directly
Stopping when dropping to setup pressure value or less to well head pressure；
3.3) operation of step 3.1) and step 3.2) is repeated, until accumulative water injection rate reaches setting value, is fulfiled assignment.
Further, the shock wave operations number set in the step 3.2) is greater than 3 times, the intra-record slack byte of the setting
Shi Changwei 5min, the setup pressure value are 1MPa；The accumulative water injection rate set in the step 3.3) is 400m3；Controllable punching
The shock wave peak pressure for hitting wave generation device generation is greater than 200MPa, and shock wave pulsewidth is greater than 50 μ s, working frequency 120s/
It is secondary.
Further, gauguste cutter drifting is used, before installation well head four-way and cable blowout control device to ensure that equipment is smooth
It goes into the well.
Further, all flow strings in underground are played out before installation well head four-way and cable blowout control device, so as to controllable
Impacting wave generation device being capable of operation in tripping in coal bed gas well.
Meanwhile the invention also provides another kinds to be changed based on the coal bed gas well of the compound surge formula pressurized water injection of controllable shock wave
Make method, it is characterised in that: the following steps are included:
1) well head four-way and cable blowout control device are installed, wherein well head four-way lower end is connect with well head, upper end and cable blowout control
Device connection, the first side port connect high pressure water injection pipeline, and the second side port connects pressure gauge；
2) controllable shock wave equipment is generated to pass through in cable blowout control device lower going-into-well；
3) well head cable blowout control device is closed, is filled the water to pit shaft, after liquid level reaches well head, starts shock wave operation, is completed every
After the operations number of a setting setting, acts underground shock wave and generate equipment；
4) cable blowout control device is removed, well head is blocked, starts the water filling pressurization of surge formula, after reaching water injection rate, removes water filling
Pipe；
5) water pump, water pipe and the bar that draws water are installed, mining is put into according to mining technique；
Wherein the step 4) is specific as follows:
Cable blowout control device is removed, well head is blocked；
4.1) by high pressure water injection pipeline to coal bed gas well fill the water be pressurized, when pressure reach operation coal seam compression strength or
Water injection rate of person stops water filling after reaching setting value；
4.2) it when water injection pressure drops to setting value or less naturally, fills the water pressurize to pit shaft again, when pressure reaches work
The compression strength in industry coal seam or a water injection rate stop water filling after reaching setting value；
4.3) it repeats step 4.1) and step 4.2) forms surge in coal seam, set when adding up to reach to pit shaft injected water volume
When more than definite value, fulfil assignment.
Further, the shock wave operations number set in the step 3) is 5-10 time；One in the step 4.1)
Secondary water injection rate setting value is 200m3；Step 4.2) the setup pressure value is 1MPa, and a water injection rate setting value is 200m3；Institute
The accumulative water injection rate setting value for stating step 4.3) is 600m3；The shock wave peak pressure that controllable impact wave generation device generates is big
In 200MPa, shock wave pulsewidth is greater than 50 μ s, and working frequency is 120s/ times.
Further, gauguste cutter drifting is used, before installation well head four-way and cable blowout control device to ensure that equipment is smooth
It goes into the well.
Further, all flow strings in underground are played out before installation well head four-way and cable blowout control device, so as to controllable
Impacting wave generation device being capable of operation in tripping in coal bed gas well.
Using the solution of the present invention, have the advantage that
1, controllable shock wave technology of the present invention is pure physical method, does not inject any foreign liquid to coal seam,
Therefore coal seam is not injured；
2, the present invention is due to the dynamic pressure for generating controllable shock wave technology and static pressure the characteristics of progress of water filling pressurization
It combines, the new crack that shock wave generates can realize the support of fracture under conditions of filling the water pressurization, and may be further extended
Crack forms seam net around pit shaft, expands coal-bed gas and desorbs area, avoids the hydrostatic pressure of traditional remodeling method in coal seam
When the compaction that may cause.
3, compression strength of the present invention due to used shock wave pressure peak value much larger than coal seam can be made in primary coal
Seam and the trace in deformation coal link up the seepage channels such as disconnected hole, microfissure in coal seam, improve the seepage flow energy in coal seam
Power.
4, the present invention due to used shock wave can in coal seam wave impedance differ generated on biggish medium interface compared with
Strong shearing force removes the sundries that coal petrography surface is attached in the seepage channels such as coal seam hole, crack, plays and releases coal seam blocking
Effect improves coal seam percolation ability.
5, the present invention, which does not have to packer, to carry out segment processing to coal seam, not only can carry out fine processing to coal seam,
It can also selectively carry out the processing of specific region.
6, while controllable shock wave generates equipment and is transformed to coal bed gas well, pressure water injection can make up the present invention
Because strata pressure caused by formation depletion is insufficient, fracture extension may additionally facilitate.
Detailed description of the invention
Fig. 1 is well head connection schematic diagram of the invention；
Fig. 2 is operation process chart of the invention.
In figure: 1-well head four-way, 2-cable blowout control devices, 3-pressure gauges, 4-well heads.
Specific embodiment
It is by traditional statics side based on the coal bed gas well remodeling method of the compound surge formula pressurized water injection of controllable shock wave
Method is combined with dynamic method, and the compound surge formula pressurized water injection method of shock wave is divided into shock wave series connection surge formula pressurized water injection
Replace two kinds of operation techniques of surge formula pressurized water injection with shock wave.Controllable shock wave generate equipment using wire discharge-induced explosion etc. from
Daughter drives energetic material to generate shock wave.Controllable shock wave creates new crack, ditch to part coal seam fracturing in coal seam
After logical, extension preexisting crack, these cracks are supported and stretch under the effect of pit shaft hydraulic pressure, to improve the desorption in coal seam, seep
Stream ability inhibits the adsorption capacity again in coal seam.It is control mesh with single water injection rate when waterflood injection rate is very fast according to water filling situation
Mark, referred to as quantitative surge；It is control target, referred to as level pressure surge with water injection pressure when waterflood injection rate is slower.
Embodiment one
Coal bed gas well remodeling method based on the compound surge formula pressurized water injection of controllable shock wave, comprising the following steps:
1) well head four-way 1 and cable blowout control device 2 are installed, wherein 1 lower end of well head four-way is connect with well head 4, upper end and cable
Preventer 2 connects, and the first side port connects high pressure water injection pipeline, and the second side port connects pressure gauge 3；
2) controllable shock wave equipment is generated to pass through in 2 lower going-into-well of cable blowout control device；
3) cable blowout control device 2 is closed, fills the water into coal bed gas well, after water injection pressure reaches the compression strength in coal seam, opens
It moves controllable shock wave and generates the compound surge formula water filling pressurization operation of equipment progress shock wave；
3.1) well head cable blowout control device 2 is closed, is filled the water by high pressure water injection pipeline into coal bed gas well, when water injection pressure reaches
To after the compression strength in coal seam, stops pressurizeing and recording water injection rate, start shock wave operation；
3.2) stop after 3 Secondary Shocks wave operations of every completion, a well head pressure is recorded every 5min, until 4 pressure of well head
Stopping when dropping to following 1MPa；
3.3) operation of step 3.1) and step 3.2) is repeated, until accumulative water injection rate reaches 400m3, fulfil assignment.
4) after completing all settings, well head four-way and wellhead cable preventer 2 are opened, acts controllable shock wave generation and sets
It is standby；
5) water pump, water pipe and the bar that draws water under put into mining according to mining technique.
If there is flow string in underground, all flow strings in underground are played out before installation well head four-way and cable blowout control device,
So that controllable shock wave generation device being capable of operation in tripping in coal bed gas well.
The internal diameter of general coal bed gas well casing is 118.6mm-127.3mm, and the diameter that controllable shock wave generates equipment is
102mm, since coal bed gas well casing may have the fortuitous events such as deformation, so, before controllable shock wave generation equipment is gone into the well, use
Diameter is not less than at the gauguste cutter drifting to most deep setting of 1.5m or less 10m not less than 108mm, length, to ensure that equipment is suitable
Benefit is gone into the well.
The shock wave peak pressure that above-mentioned controllable impact wave generation device generates is greater than 200MPa, and shock wave pulsewidth is greater than 50
μ s, working frequency are 120s/ times.
Embodiment two
Coal bed gas well remodeling method based on the compound surge formula pressurized water injection of controllable shock wave, comprising the following steps:
1) well head four-way 1 and cable blowout control device 2 are installed, wherein 1 lower end of well head four-way is connect with well head 4, upper end and cable
Preventer 2 connects, and the first side port connects high pressure water injection pipeline, and the second side port connects pressure gauge 3；
2) controllable shock wave equipment is generated to pass through in 2 lower going-into-well of cable blowout control device；
3) well head cable blowout control device 2 is closed, is filled the water to pit shaft, after liquid level reaches well head, starts shock wave operation, is completed every
After the operations number of a setting setting, acts underground shock wave and generate equipment；
4) cable blowout control device is removed, well head is blocked, starts the water filling pressurization of surge formula, after reaching water injection rate, removes water filling
Pipe；
4.1) cable blowout control device 2 is removed, well head is blocked, is filled the water and is pressurized to coal bed gas well by high pressure water injection pipeline, work as pressure
Power reaches the compression strength in operation coal seam or a water injection rate reaches 200m3Stop water filling afterwards；
4.2) it when water injection pressure drops to 1MPa or less naturally, fills the water pressurize to pit shaft again, when pressure reaches operation
The compression strength in coal seam or a water injection rate reach 200m3Stop water filling afterwards；
4.3) step 4.1) and step 4.2) are repeated and forms surge in coal seam, when adding up to reach to pit shaft injected water volume
600m3When above, fulfil assignment.
5) water pump, water pipe and the bar that draws water are installed, mining is put into according to mining technique.
If there is flow string in underground, all production pipes in underground are played out before installation well head four-way 1 and cable blowout control device 2
Column, so that controllable shock wave generation device being capable of operation in tripping in coal bed gas well.
The internal diameter of general coal bed gas well casing is 118.6mm-127.3mm, and the diameter that controllable shock wave generates equipment is
102mm, since coal bed gas well casing may have the fortuitous events such as deformation, so, before controllable shock wave generation equipment is gone into the well, use
Diameter is not less than at the gauguste cutter drifting to most deep setting of 1.5m or less 10m not less than 108mm, length, to ensure that equipment is suitable
Benefit is gone into the well.
The shock wave peak pressure that above-mentioned controllable impact wave generation device generates is greater than 200MPa, and shock wave pulsewidth is greater than 50
μ s, working frequency are 120s/ times.The patent document of Publication No. CN105674818A can be used in the controllable impact wave generation device
The controllable impact wave generation device of middle record, specific structure and principle are detailed in specification specific embodiment part, can also make
With other devices that can produce controllable shock wave.
Claims (8)
1. the coal bed gas well remodeling method based on the compound surge formula pressurized water injection of controllable shock wave, it is characterised in that: including following
Step:
1) well head four-way and cable blowout control device are installed, wherein well head four-way lower end is connect with well head, and upper end and cable blowout control device connect
It connects, the first side port connects high pressure water injection pipeline, and the second side port connects pressure gauge；
2) controllable shock wave equipment is generated to pass through in cable blowout control device lower going-into-well；
3) cable blowout control device is closed, is filled the water into coal bed gas well, after water injection pressure reaches the compression strength in coal seam, starting is controllable
Shock wave generates equipment and carries out the compound surge formula water filling pressurization operation of shock wave；
4) after completing all settings, well head four-way and wellhead cable preventer are opened, acts controllable shock wave and generates equipment；
5) water pump, water pipe and the bar that draws water under put into mining according to mining technique；
Wherein the step 3) is specific as follows:
Close well head cable blowout control device；
3.1) it is filled the water by high pressure water injection pipeline into coal bed gas well, after water injection pressure reaches the compression strength in coal seam, is stopped
It pressurizes and records water injection rate, start shock wave operation；
3.2) stop after every shock wave operation for completing setting number, a well head pressure is recorded every fixed duration, until well
Stopping when mouth pressure drops to setup pressure value or less；
3.3) operation of step 3.1) and step 3.2) is repeated, until accumulative water injection rate reaches setting value, is fulfiled assignment.
2. the coal bed gas well remodeling method according to claim 1 based on the compound surge formula pressurized water injection of controllable shock wave,
It is characterized by: the shock wave operations number set in the step 3.2) is greater than 3 times, when intra-record slack byte of the setting, is a length of
5min, the setup pressure value are 1MPa；The accumulative water injection rate set in the step 3.3) is 400m3；Controllable shock wave produces
The shock wave peak pressure that generating apparatus generates is greater than 200MPa, and shock wave pulsewidth is greater than 50 μ s, and working frequency is 120s/ times.
3. the coal bed gas well transformation side according to claim 1 or 2 based on the compound surge formula pressurized water injection of controllable shock wave
Method, it is characterised in that: gauguste cutter drifting is used before installation well head four-way and cable blowout control device.
4. the coal bed gas well transformation side according to claim 1 or 2 based on the compound surge formula pressurized water injection of controllable shock wave
Method, it is characterised in that: play out all flow strings in underground before installation well head four-way and cable blowout control device.
5. the coal bed gas well remodeling method based on the compound surge formula pressurized water injection of controllable shock wave, it is characterised in that: including following
Step:
1) well head four-way and cable blowout control device are installed, wherein well head four-way lower end is connect with well head, and upper end and cable blowout control device connect
It connects, the first side port connects high pressure water injection pipeline, and the second side port connects pressure gauge；
2) controllable shock wave equipment is generated to pass through in cable blowout control device lower going-into-well；
3) well head cable blowout control device is closed, is filled the water to pit shaft, after liquid level reaches well head, starts shock wave operation, completes each work
After the operations number of industry point setting, acts underground shock wave and generate equipment；
4) cable blowout control device is removed, well head is blocked, starts the water filling pressurization of surge formula, after reaching water injection rate, removes water injection pipe；
5) water pump, water pipe and the bar that draws water are installed, mining is put into according to mining technique；
Wherein the step 4) is specific as follows:
Cable blowout control device is removed, well head is blocked；
4.1) it is filled the water and is pressurized to coal bed gas well by high pressure water injection pipeline, when pressure reaches the compression strength or one in operation coal seam
Secondary water injection rate stops water filling after reaching setting value；
4.2) it when water injection pressure drops to setting value or less naturally, fills the water pressurize to pit shaft again, when pressure reaches operation coal
The compression strength or a water injection rate of layer stop water filling after reaching setting value；
4.3) step 4.1) and step 4.2) are repeated and forms surge in coal seam, when adding up to reach setting value to pit shaft injected water volume
When above, fulfil assignment.
6. the coal bed gas well remodeling method according to claim 5 based on the compound surge formula pressurized water injection of controllable shock wave,
It is characterized by: the shock wave operations number set in the step 3) is 5-10 time；Primary water filling in the step 4.1)
Amount setting value is 200m3；Step 4.2) the setup pressure value is 1MPa, and a water injection rate setting value is 200m3；The step
4.3) accumulative water injection rate setting value is 600m3；The shock wave peak pressure that controllable impact wave generation device generates is greater than
200MPa, shock wave pulsewidth are greater than 50 μ s, and working frequency is 120s/ times.
7. the coal bed gas well transformation side according to claim 5 or 6 based on the compound surge formula pressurized water injection of controllable shock wave
Method, it is characterised in that: gauguste cutter drifting is used before installation well head four-way and cable blowout control device.
8. the coal bed gas well transformation side according to claim 5 or 6 based on the compound surge formula pressurized water injection of controllable shock wave
Method, it is characterised in that: using playing out all flow strings in underground before gauguste cutter drifting.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710972985.8A CN107989586B (en) | 2017-10-18 | 2017-10-18 | Coal bed gas well remodeling method based on the compound surge formula pressurized water injection of controllable shock wave |
| PCT/CN2017/116170 WO2019075885A1 (en) | 2017-10-18 | 2017-12-14 | Method of reforming coal-bed gas well employing controllable shock waves in combination with surge water injection pressurization |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710972985.8A CN107989586B (en) | 2017-10-18 | 2017-10-18 | Coal bed gas well remodeling method based on the compound surge formula pressurized water injection of controllable shock wave |
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| CN110243236A (en) * | 2019-05-31 | 2019-09-17 | 周子惠 | A kind of anti-frogman's device of repetition pulse strong shock wave and working method |
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| CN104832149A (en) * | 2015-05-16 | 2015-08-12 | 太原理工大学 | Electric pulse assisted hydrofracture unconventional gas reservoir permeability increasing method |
| CN105298462A (en) * | 2015-11-06 | 2016-02-03 | 中国矿业大学 | High-power electric knocking assisted hydrofracture coal seam permeability increase method for end-located drainage roadway |
| CN105370257B (en) * | 2015-11-06 | 2018-09-14 | 中国矿业大学 | A kind of coal bed gas well high power electric detonation shake auxiliary hydraulic fracturing method for increasing |
| CN105275443B (en) * | 2015-11-06 | 2018-10-19 | 中国矿业大学 | A kind of underground coal mine high power electric detonation shake auxiliary hydraulic fracturing anti-reflection method |
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2017
- 2017-10-18 CN CN201710972985.8A patent/CN107989586B/en active Active
- 2017-12-14 WO PCT/CN2017/116170 patent/WO2019075885A1/en active Application Filing
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| WO2019075885A1 (en) | 2019-04-25 |
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