CN105757260A - Low-remanence control valve of downhole pulse generator - Google Patents
Low-remanence control valve of downhole pulse generator Download PDFInfo
- Publication number
- CN105757260A CN105757260A CN201610181338.0A CN201610181338A CN105757260A CN 105757260 A CN105757260 A CN 105757260A CN 201610181338 A CN201610181338 A CN 201610181338A CN 105757260 A CN105757260 A CN 105757260A
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- Prior art keywords
- push rod
- plug
- valve
- valve port
- remanent magnetism
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/14—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with ball-shaped valve member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
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- 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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
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- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/14—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves
- E21B47/18—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves through the well fluid, e.g. mud pressure pulse telemetry
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/48—Attaching valve members to screw-spindles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0209—Check valves or pivoted valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0675—Electromagnet aspects, e.g. electric supply therefor
Abstract
The invention creatively relates to the technical field of oil exploration and drilling, in particular to a low-remanence control valve of a downhole pulse generator. The control valve is characterized in that a return spring is arranged between a push rod and a plug; when an electromagnetic drive device drives the push rod to push the plug to plug a valve port, the spring can be compressed, and at the moment, the spring force is less than the thrust applied by the electromagnetic drive device onto the push rod and is more than the thrust applied by mud pressure onto the plug; one end of the spring pushes the plug to be propped against the mud pressure at the valve port, and the other end of the spring applies the reverse thrust onto the push rod; when the valve port is opened to remove the control signal current of the electromagnetic drive device, although part of the thrust is applied by the push rod onto the spring due to remanence, the remanence thrust is greatly less than the counter-acting force of the spring, so that the push rod can quickly return to remove the remanence thrust, and then, the plug and the push rod completely reset under the drive of the mud pressure, therefore, the control valve can effectively perform high-frequency response.
Description
Technical field
The invention relates to oil exploration and drilling and production technology field, and the downhole pulser particularly to a kind of low remanent magnetism controls valve.
Background technology
In oil exploration, drilling process, drilling equipment is requisite instrument.The core of drilling equipment is in that drill bit, it is therefore desirable to monitor the drilling situation of drill bit at any time.But, along with going deep into of probing, drill bit can go deep in stratum, staff on ground is difficult to directly observe the situation of drill bit, accordingly, it would be desirable to arrange multiple monitoring device at drill bit place, for instance direction sensor and temperature sensor etc., and the data detected are delivered to ground by communication link, the staff on ground it is received analyzing.
Extremely dislike slightly due to subsurface environment, detecting device is difficult to be communicated by general communication line and ground, it is also difficult to communicated by conventional wireless mode and ground.At present, the mode of ground and underground communica tion is usually and adopts a pulse generator to control to be realized by slurry transportation pipeline, its principle is to arrange pulse generator in mud runner, pulse generator is got through according to certain rule/blocked (has not been block in practical application, usually reduce the aperture of runner) mud runner, so that mud runner produces regular pulse, surface personnel is in ground detection and decodes these pulses to obtain detection data.
Concrete, pulse generator generally comprises main valve and controls valve, guiding valve is set in main valve and is arranged at outside guiding valve the flow-limiting valve at place, the tail end of main valve is connected to control valve, a mud part flow to control valve through spool cavity, and flow out in the discharge orifice controlling valve, another part is by the space between guiding valve and flow-limiting valve, when the valve port controlling valve is closed, the mud of spool cavity cannot flow out, chamber pressure raises, thus promoting guiding valve to slide, reduce the gap between guiding valve and flow-limiting valve, the aperture of whole slurry channel reduces, thus mud integral pressure raises, produce a pulse.Therefore, as long as controlling the valve valve port according to the orderly on-off control valve of the signal of detecting device, whole slurry channel just can produce a regular pulse.
But in practice, the mechanical wave that pulse generator produces always is difficult to the electromagnetic wave strict conformance occurred with detecting device, particularly when high frequency.Applicant finds through research, and one of them major reason is exactly the remanent magnetism problem controlling valve.In controlling valve, typically require an electromagnetic actuator device (usually coil), the signal of telecommunication that electromagnetic actuator device is sent according to detecting device, a magnetic field is produced when needs block valve port, thus the push rod pushed away in brake control valve, push rod promotes plug closure valve port again, then cancels magnetic field when needing to release the closure to valve port, and the mud pressure outside valve port can promote plug and push rod to reset.But actually, after removing the signal of telecommunication of electromagnetic actuator device, magnetic conduction substance still can remain remanent magnetism, magnetic field is difficult to quickly be wholly absent, therefore push rod is still suffered from certain thrust, this thrust can offset the pressure of the initial period counteracting mud of the pressure of a part of mud in push rod reseting procedure, thus causing resetting slowly.And resetting slowly in situation, then be difficult to be rapidly performed by high frequency response.
Summary of the invention
The purpose of the invention is in that to avoid above-mentioned weak point of the prior art to provide a kind of remanent magnetism that can reduce electromagnetic actuator device, so that control valve can effectively carry out high frequency response.
Invention thinking: inventor have found that, in current control valve, the armature of electromagnetic actuator device can push against control valve shell, moving armature also can push against control valve shell through magnetic conductance seat, armature, control valve shell, magnetic conductance seat and moving armature constitute a closed loop, electromagnetic actuator device produces magnetic field and transmits in this closed loop, that is, this flux path is to need the shell through controlling valve, and control valve when selecting shell, generally top-priority is hardness performance, it is ensured that control valve surface is capable of withstanding and is not destroyed by slurry erosion.But, in nature, material its magnetic property general that hardness performance is good is poor, and therefore, housing also just becomes the key of the remanent magnetism of electromagnetic actuator device.But, current those skilled in the art reduces the method for remanent magnetism and is normally based on the coil in electromagnetic actuator device, magnetic conductance seat etc., it does not have be fully recognized that housing is only the key producing remanent magnetism.
The purpose of the invention is achieved through the following technical solutions:
nullThe downhole pulser providing a kind of low remanent magnetism controls valve，Including valve port、Discharge orifice、Plug、Push rod and electromagnetic actuator device，Described valve port connects with described discharge orifice，Described electromagnetic actuator device drives described push rod to move towards valve port according to the control signal received，So that described push rod drives described plug to block described valve port，Described electromagnetic actuator device includes solenoid、Magnetic conductance seat and the moving armature being arranged in magnetic conductance seat，Described solenoid produces driving magnetic field according to electric control signal，Described driving magnetic field is transferred to described magnetic conductance seat through the shell controlling valve thus driving moving armature to move towards valve port，Moving armature connects described push rod，Coercivity H≤the 35A/m of described control valve shell，Maximum permeability μm >=0.012H/m，Magnetic induction density B 300 >=1.1T when magnetic field intensity is 300A/m.
Wherein, described control valve shell is coated with hard alloy layer.
Wherein, the hardness of described hard alloy layer is be more than or equal to 1200HV0.3.
Wherein, described hard coat and the bond strength of control valve shell are be more than or equal to 120Mpa.
Wherein, the thickness of described hard coat is less than or equal to 0.2mm.
Wherein, also include return spring, return spring one end is connected with push rod, the other end is connected with plug, described push rod makes described return spring deformation and then drives described plug to block described valve port, when described plug blocks described valve port, described return spring to the active force of push rod and plug more than the liquid pressure to valve port plug.
Wherein, described plug offers inner chamber, and described push rod is inserted in described inner chamber towards one end of valve port.
Wherein, the inner chamber cavity wall of described plug or lateral wall offer groove, described push rod front end is provided with spacing bearing pin, described spacing bearing pin is inserted in described groove, along the width of groove described in push rod vibration-direction more than described spacing bearing pin width so that push rod move back and forth time described spacing bearing pin can move back and forth in a groove.
Wherein, described plug is provided with the first stage away from one end of valve port, and described push rod is provided with the second stage, and the first stage is fixed in described return spring one end, and the other end is fixed on the second stage.
nullThe beneficial effect of the invention: the invention is when selecting controller housing，Pay the utmost attention to the magnetic conduction ability of material，Especially，The magnetic property requiring shell reaches coercivity H≤35A/m，Maximum permeability μm >=0.012H/m，The requirement of magnetic induction density B 300 >=1.1T when magnetic field intensity is 300A/m，Owing to coercivity is smaller，Therefore after electromagnetic actuator device power-off，Shell also is able to quick demagnetization，Significantly reduce remanent magnetism，So that control valve can effectively carry out high frequency response，On the other hand，Owing to permeability is relatively larger，Therefore，Electromagnetic actuator device needs only to pass to less electric current just can make battery armature obtain enough magnetic field forces，This reduces the energy consumption of battery powered device on the one hand，And the magnetic field intensity that battery powered device produces is also smaller，Therefore the magnetic field intensity on controller housing it is transferred to also smaller，Gu also can significantly reduce remanent magnetism.
Accompanying drawing explanation
Utilize accompanying drawing that the invention is described further, but the embodiment in accompanying drawing does not constitute any restriction to the invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to the following drawings.
Fig. 1 is the structural representation of the downhole pulser control valve of a kind of low remanent magnetism of the invention.
Include in FIG:
1 valve port, 2 discharge orifices, 3 plugs, 31 inner chambers, 32 grooves, 33 first stages, 4 push rods, 41 spacing bearing pins, 42 second stages, 5 return springs, 6 solenoids, 7 shells, 8 magnetic conductance seats, 9 moving armatures.
Detailed description of the invention
With the following Examples the invention is further described.
The downhole pulser of a kind of low remanent magnetism of the invention controls the detailed description of the invention of valve, as shown in Figure 1, including: valve port 1, discharge orifice 2, plug 3, push rod 4 and electromagnetic actuator device, described valve port 1 connects with described discharge orifice 2, and described electromagnetic actuator device drives the described push rod 4 of control and plug 3 to move towards valve port according to the control signal received.
Described plug 3 offers inner chamber 31, described push rod 4 is inserted in described inner chamber 31 towards one end of valve port 1, described push rod 4 drives described plug 3 to block described valve port 1, inner chamber 31 cavity wall of plug 3 offers groove 32, described push rod 4 front end is provided with spacing bearing pin 41, described spacing bearing pin 41 is inserted in described groove 32, along the width of groove 32 described in push rod 4 vibration-direction more than described spacing bearing pin 41 width so that described spacing bearing pin 41 can move back and forth in groove 32 when push rod 4 moves back and forth.
Also including return spring 5, plug 3 is provided with the first stage 33 away from one end of valve port 1, and push rod 4 is provided with the second stage 42, and the first stage 33 is fixed in described return spring 5 one end, and the other end is fixed on the second stage 42.
When electromagnetic actuator device drives push rod 4 to move towards valve port 1, push rod 4 promotes return spring 5, and then promote plug 3 to move towards valve port 1, when plug 3 props up valve port 1, now owing to acting on the thrust of push rod 4 more than the mud pressure to plug 3, and spacing bearing pin 41 can move back and forth in groove 32, therefore now push rod 4 may proceed to reach so that return spring 5 compresses；When the electric current of electromagnetic actuator device removes, the electromagnetic actuator device thrust meeting rapid decrease to push rod 4, although now also can be there is certain thrust in push rod 4 because of remanent magnetism, but this thrust is inevitable significantly less than the return spring 5 thrust to push rod 4, push rod 4 can fast fallback, until spacing bearing pin 41 touches the inwall of groove 32, because at this moment having had been extricated from remanent magnetism, plug 3 and push rod 4 just can continue to reset completely rapidly under mud pressure promotes.
Compared with prior art, this technology no longer places one's entire reliance upon the mud pressure to plug 3 to promote push rod 4 to reset, and, electromagnetic actuator device significantly to drive push rod 4 and plug 3 more than the thrust of mud pressure, thus realizing the quick blocking to valve port 1, release the active force to push rod 4 of spring when valve port 1 is blocked also greater than mud pressure, can significantly reduce the impact of remanent magnetism, thus quickly valve port 1 being released closure, the time needed for valve completes the closure releasing closure This move cycle that controls significantly reduces, response speed effectively improves, therefore this control valve can significantly more efficient response high-frequency signal.
In the present embodiment, described electromagnetic actuator device includes solenoid 6, magnetic conductance seat 8 and the moving armature 9 being arranged in magnetic conductance seat 8, described solenoid 6 produces driving magnetic field according to electric control signal, described driving magnetic field is transferred to described magnetic conductance seat 8 thus driving moving armature 9 to move towards valve port 1 through the shell 7 controlling valve, moving armature 9 connects described push rod 4, coercivity H≤the 35A/m of described control valve shell 7, maximum permeability μm >=0.012H/m, magnetic induction density B 300 >=1.1T when magnetic field intensity is 300A/m.Owing to controlling the magnetic conduction device that valve shell 7 belongs to important in electromagnetic actuator device, the performance therefore controlling valve shell 7 can have a strong impact on the situation of remanent magnetism, thus affecting the response speed controlling valve.But, at present when considering the materials of shell 7 of electromagnetic valve, it is usually and only considers its changing firmness requirements, without considering its permeability, the application due to recognize remanent magnetism on control response valve ability impact, it is thus preferred to meet These parameters material as control valve shell 7 material.On the other hand, owing to permeability is relatively larger, therefore, electromagnetic actuator device needs only to pass to less electric current just can make battery armature obtain enough magnetic field forces, this reduces the energy consumption of battery powered device on the one hand, down-hole field of detecting after all, down-hole electricity consumption is very difficult, reduce power consumption and can effectively improve system stability, and the magnetic field intensity that battery powered device produces is also smaller, therefore the magnetic field intensity on controller housing it is transferred to also smaller, Gu also can significantly reduce remanent magnetism.
Especially, control valve shell 7 and be coated with hard alloy layer.The hardness of described hard alloy layer is be more than or equal to 1200HV0.3.The bond strength of described hard coat and control valve shell 7 is be more than or equal to 120Mpa.The thickness of described hard coat is less than or equal to 0.2mm.When preferably material is used as shell 7 to selection permeability, inevitably, the hardness of the shell 7 controlling valve then can decline to some extent, this can cause that controlling valve outer surface is subject to slurry erosion and is destroyed, therefore, at the outer surface coated with hard alloy-layer controlling valve shell 7, so that it is guaranteed that control valve surface is capable of withstanding and is not destroyed by slurry erosion.
Finally should be noted that; above example is only in order to illustrate the technical scheme of the invention; but not the restriction to the invention protection domain; although having made to explain to the invention with reference to preferred embodiment; it will be understood by those within the art that; the technical scheme of the invention can be modified or equivalent replacement, without deviating from the spirit and scope of the invention technical scheme.
Claims (9)
- null1. the downhole pulser of a low remanent magnetism controls valve，Including valve port、Discharge orifice、Plug、Push rod and electromagnetic actuator device，Described valve port connects with described discharge orifice，Described electromagnetic actuator device drives described push rod to move towards valve port according to the control signal received，So that described push rod drives described plug to block described valve port，Described electromagnetic actuator device includes solenoid、Magnetic conductance seat and the moving armature being arranged in magnetic conductance seat，Described solenoid produces driving magnetic field according to electric control signal，Described driving magnetic field is transferred to described magnetic conductance seat through the shell controlling valve thus driving moving armature to move towards valve port，Moving armature connects described push rod，It is characterized in that: the coercivity H≤35A/m of described control valve shell，Maximum permeability μm >=0.012H/m，Magnetic induction density B 300 >=1.1T when magnetic field intensity is 300A/m.
- 2. the downhole pulser of a kind of low remanent magnetism as claimed in claim 1 controls valve, it is characterised in that: described control valve shell is coated with hard alloy layer.
- 3. the downhole pulser of a kind of low remanent magnetism as claimed in claim 2 controls valve, it is characterised in that: the hardness of described hard alloy layer is be more than or equal to 1200HV0.3.
- 4. the downhole pulser of a kind of low remanent magnetism as claimed in claim 2 controls valve, it is characterised in that: the bond strength of described hard coat and control valve shell is be more than or equal to 120Mpa.
- 5. the downhole pulser of a kind of low remanent magnetism as claimed in claim 2 controls valve, it is characterised in that: the thickness of described hard coat is less than or equal to 0.2mm.
- 6. the downhole pulser of a kind of low remanent magnetism as claimed in claim 1 controls valve, it is characterized in that: also include return spring, return spring one end is connected with push rod, the other end is connected with plug, described push rod makes described return spring deformation and then drives described plug to block described valve port, when described plug blocks described valve port, described return spring to the active force of push rod and plug more than the liquid pressure to valve port plug.
- 7. the downhole pulser of a kind of low remanent magnetism as claimed in claim 1 controls valve, it is characterised in that: described plug offers inner chamber, and described push rod is inserted in described inner chamber towards one end of valve port.
- 8. the downhole pulser of a kind of low remanent magnetism as claimed in claim 1 controls valve, it is characterized in that: the inner chamber cavity wall of described plug or lateral wall offer groove, described push rod front end is provided with spacing bearing pin, described spacing bearing pin is inserted in described groove, along the width of groove described in push rod vibration-direction more than described spacing bearing pin width so that push rod move back and forth time described spacing bearing pin can move back and forth in a groove.
- 9. the downhole pulser of a kind of low remanent magnetism as claimed in claim 1 controls valve, it is characterized in that: described plug is provided with the first stage away from one end of valve port, described push rod is provided with the second stage, and the first stage is fixed in described return spring one end, and the other end is fixed on the second stage.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610181338.0A CN105757260B (en) | 2016-03-28 | 2016-03-28 | A kind of downhole pulser control valve of low remanent magnetism |
| CN201711449034.9A CN108331924B (en) | 2016-03-28 | 2016-03-28 | Low-remanence underground pulse generator control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610181338.0A CN105757260B (en) | 2016-03-28 | 2016-03-28 | A kind of downhole pulser control valve of low remanent magnetism |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711449034.9A Division CN108331924B (en) | 2016-03-28 | 2016-03-28 | Low-remanence underground pulse generator control valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105757260A true CN105757260A (en) | 2016-07-13 |
| CN105757260B CN105757260B (en) | 2018-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610181338.0A Active CN105757260B (en) | 2016-03-28 | 2016-03-28 | A kind of downhole pulser control valve of low remanent magnetism |
| CN201711449034.9A Active CN108331924B (en) | 2016-03-28 | 2016-03-28 | Low-remanence underground pulse generator control valve |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711449034.9A Active CN108331924B (en) | 2016-03-28 | 2016-03-28 | Low-remanence underground pulse generator control valve |
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| CN (2) | CN105757260B (en) |
Cited By (1)
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| CN205896341U (en) * | 2016-03-28 | 2017-01-18 | 广东普洛测控科技有限公司 | Impulse generator control valve in pit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105626940A (en) * | 2016-03-28 | 2016-06-01 | 广东普洛测控科技有限公司 | Underground pulse generator control valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105757260B (en) | 2018-04-20 |
| CN108331924B (en) | 2020-04-14 |
| CN108331924A (en) | 2018-07-27 |
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