CN209280236U - LWD instrument air-tightness detection device with self-checking function - Google Patents
LWD instrument air-tightness detection device with self-checking function Download PDFInfo
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- CN209280236U CN209280236U CN201822030258.2U CN201822030258U CN209280236U CN 209280236 U CN209280236 U CN 209280236U CN 201822030258 U CN201822030258 U CN 201822030258U CN 209280236 U CN209280236 U CN 209280236U
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- piston
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- detection device
- tightness detection
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Abstract
The utility model relates to vacuum sensing technology fields, more particularly to a kind of LWD instrument air-tightness detection device with self-checking function, it include: pedestal, including piston sleeve and the first interface being arranged on the piston bush barrel and second interface, wherein, piston sleeve has hollow cavity, and first interface, second interface are connected to the hollow cavity of piston sleeve, one end of piston sleeve is additionally provided with transfer tube, and the piston sleeve is connected to by transfer tube with vaccum-pumping equipment；Sealing element is connect with the first interface removable seal；Pressure vacuum gauge is sealedly connected in the second interface；Piston switch protrudes into the hollow cavity of the piston sleeve, is cooperated by the piston switch and the switching seal of tube, and the piston sleeve is connected to vaccum-pumping equipment disconnection.The utility model has convenient self-test, compact structure and is easily installed, and effectively improves detection reliability and working efficiency.
Description
Technical field
The utility model relates to vacuum sensing technology fields, and in particular to a kind of LWD instrument air-tightness with self-checking function
Detection device.
Background technique
Well logging (LWD) be grow up on the basis of measurement while drilling (MWD), for solving horizontal well and multi-branched
Well formation evaluation and geosteering while drilling and the well logging comprehensive application technology to grow up.LWD technology is mainly used in point
It distinguishes stratum, differentiates aqueous vapor water, judges the occasions such as formation variation, prediction high pressure formation, drilling period can be greatly shortened, reduce water
Aquifer pollution is gathered around in the soaking time of gas, reduction.Since the application of LWD instrument is mostly underground high-voltage test environment, it is right
Air-tightness requirement is very high.If the air-tightness of LWD instrument does not reach requirement, it is easy to happen liquid filling phenomenon in underground, no
Significant impact can be only caused to measurement result, and irreversible pollution damage can be caused to LWD instrument.
In order to guarantee LWD instrument in underground acceptable safety operation, LWD instrument requires to carry out airtight before going into the well every time
Property detection.Existing LWD instrument air-tightness detection device has multiple leakproofness valves, and the part of valve is unqualified or aging meeting
Cause the leakproofness of detection device itself not up to standard；And the air tightness test in existing detection device is needed through other detectors
Device is completed, and cannot carry out air-tightness self-test before each is used, easily leads to the air-leakage test result inaccuracy of LWD instrument.Cause
This need to provide it is a kind of have self-checking function, reliable and portable LWD instrument air-tightness detection device, to meet LWD instrument
On-the-spot test demand.
Utility model content
In view of the above problems in the prior art, the purpose of the utility model is to provide a kind of LWD with self-checking function
The air-tightness detection device of instrument air-tightness detection device, the LWD instrument can carry out self-test before every use, and compact is close
Envelope property and accuracy are reliable, can satisfy the live air-leakage test demand of LWD instrument.
In order to solve the above-mentioned technical problem, the specific technical solution of the utility model is as follows:
A kind of LWD instrument air-tightness detection device with self-checking function, comprising: pedestal, including piston sleeve and setting
First interface and second interface on the piston bush barrel, the piston sleeve have hollow cavity, the first interface,
Second interface is connected to the hollow cavity of the piston sleeve, and the piston sleeve includes the first end and second end of connection
Portion, the first end are connected to vaccum-pumping equipment；Sealing element is connect with the first interface removable seal；Vacuum pressure
Power table is sealedly connected in the second interface；Piston switch protrudes into the hollow cavity of the piston sleeve, the piston
Switch, can be far from the first end or with described first by moving reciprocatingly in the hollow cavity of the piston sleeve
End part seal cooperation is cooperated by the piston switch and first end sealing, and the piston sleeve is vacuumized with described
Equipment disconnects connection.
Optionally, the sealing element is end cover or sealing-plug.
Further, the first interface and/or the sealing element are equipped with the first sealing ring, the sealing element with
The first interface is tightly connected by the sealing element.
Specifically, the piston switch includes that piston rod, the first piston that the piston rod end is arranged in and setting exist
The second piston of the piston rod bar portion, the first piston protrude into the inner cavity of the second end, in the band of the piston rod
Under dynamic, the first piston can cooperate far from the first end or seal with the first end, the second piston with
The second end sealing cooperation.
Specifically, the internal diameter of the first end is less than the internal diameter of the second end, the inner sidewall of the second end
On set there are two aperture, two apertures are connected to the first interface and the second interface respectively, the first piston
After first end cooperation, part first piston is located in the inner cavity of the second end, the first piston, described the
The inner sidewall of two pistons and the second end formed ring cavity, the ring cavity by two apertures respectively with institute
First interface is stated to be connected to second interface.
Preferably, the first piston is equipped with the second sealing ring, sets third sealing ring in the second piston.
Preferably, the first piston is spirally connected with the first end, and the second piston is spirally connected with the second end.
Preferably, the piston rod has the holding end far from the first piston, and the holding end stretches out described second
End；Be additionally provided with limited location snap ring on the piston rod, the limited location snap ring setting the holding end and the second piston it
Between；The inner wall of the piston sleeve is equipped with positioning fastener, when the first piston is far from the first end, the positioning card
Part can be connected in the second piston, when the first piston and first end sealing cooperate, the positioning fastener
It is connected on the limited location snap ring.
Preferably, the air-tightness detection device further includes transfer tube, and the transfer tube is sealedly connected on the first end
The end point in portion, the first end are connected to by the transfer tube with the vaccum-pumping equipment.
On the basis of above-mentioned utility model content, the application method of the air-tightness detection device comprising steps of
S1. sealing element is sealedly connected on the first interface of pedestal, pressure vacuum gauge is sealedly connected on second and is connect
On mouth, vaccum-pumping equipment is tightly connected on the first end；
S2. apply pulling force on piston switch and make it away from first end, open vaccum-pumping equipment pumping, record vacuum pressure
First self-test value of power table；
S3. applying thrust on piston switch makes it seal cooperation with first end, and record is beyond after the first setting time
Second self-test value of pressure vacuum gauge judges the air-leakage test dress based on first self-test value and second self-test value
Set the air-tightness of itself, however, it is determined that the air-tightness of the air-tightness detection device is qualified, then enters step S4；
S4. the sealing element on the first interface is unloaded, LWD instrument to be measured and the first interface are tightly connected,
Apply pulling force on piston switch and make it away from first end, opens vaccum-pumping equipment pumping, record the first of pressure vacuum gauge
Detected value；
S5. applying thrust in piston switch makes it seal cooperation with first end, and record is beyond true after the first setting time
Second detected value of hollow pressure gauge, based on first detected value and the second detected value judge the LWD instrument air-tightness whether
It is qualified.
By adopting the above technical scheme, the LWD instrument air-tightness detection device tool described in the utility model with self-checking function
It has the advantages that:
1. the utility model is in second interface by being arranged sealing element, do not need to increase additional test equipment or
In the case where changing test condition, realize every time using the leakproofness self-test before air-tightness detection device, it is ensured that LWD instrument air-tightness
The accuracy of testing result.
2. the utility model reduces the components such as valve switch, avoids valve relative to traditional air-tightness detection device
Negative gas is run at door switch, improves the reliability and accuracy of sealing propertytest.
3. the utility model is simple and compact for structure, compact, is easily installed and processes, manufacturing cost is effectively reduced and mentions
High working efficiency.
Detailed description of the invention
It, below will be to institute in embodiment or description of the prior art in order to illustrate more clearly of the technical solution of the utility model
Attached drawing to be used is needed to be briefly described.It should be evident that the accompanying drawings in the following description is only some of the utility model
Embodiment for those of ordinary skill in the art without creative efforts, can also be attached according to these
Figure obtains other attached drawings.
Structural schematic diagram under the air-tightness detection device sense channel open state of Fig. 1 the utility model；
Structural schematic diagram under the air-tightness detection device sense channel closed state of Fig. 2 the utility model；
Fig. 3 is the structural schematic diagram after air-tightness detection device is connect with LWD instrument in Fig. 1；
Fig. 4 is the perspective view of the explosion of air-tightness detection device in Fig. 1.
In figure: 1- pedestal, 2- sealing element, 3- pressure vacuum gauge, 4- piston switch, 5- pump-line, 6-LWD instrument, 11-
Piston sleeve, 111- first end, 112- the second end, 113- aperture, 12- first interface, 13- second interface, 14- switching
Pipe, 15- ring cavity, the first sealing ring of 21-, 41- piston rod, 42- first piston, 43- second piston, the second sealing ring of 44-,
45- third sealing ring, 46- holding end, 47- limited location snap ring, 48- position fastener.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are in the premise for not making creative work
Under every other embodiment obtained, fall within the protection scope of the utility model.
It should be noted that the specification and claims of the utility model and term " first " in above-mentioned attached drawing,
" second " etc. is to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that in this way
The data used are interchangeable under appropriate circumstances, so that the embodiments of the present invention described herein can be in addition at this
In illustrate or description those of other than sequence implement.In addition, term " includes " and " having " and their any deformation, meaning
Figure be to cover it is non-exclusive include, for example, containing the process, method of a series of steps or units, device, product or equipment
Those of be not necessarily limited to be clearly listed step or unit, but may include be not clearly listed or for these processes,
The intrinsic other step or units of method, product or equipment.
With reference to Fig. 1,2 and 4, a kind of 1. 6 air-tightness detection devices of LWD instrument with self-checking function, which is characterized in that packet
It includes: pedestal 1, including piston sleeve 11 and the first interface 12 being arranged on 11 wall of piston sleeve and second interface 13,
The piston sleeve 11 has hollow cavity, and the first interface 12, second interface 13 are hollow interior with the piston sleeve 11
Chamber connection, the piston sleeve 11 include the first end 111 and the second end 112 of connection, and the first end 111 and pumping are true
Null device connection；Sealing element 2 is connect with 12 removable seal of first interface；Pressure vacuum gauge 3 is sealedly connected on institute
It states in second interface 13；Piston switch 4 protrudes into the hollow cavity of the piston sleeve 11, and the piston switch 4 passes through in institute
It states in the hollow cavity of piston sleeve and moves reciprocatingly, it can be far from the first end 111 or close with the first end 111
Envelope cooperation is cooperated by the piston switch 4 and the first end 111 sealing, and the piston sleeve 11 is vacuumized with described
Equipment disconnects connection.
Preferably, the pedestal 1 is cross, and the piston sleeve 11 is horizontally disposed, the first interface 12 with it is described
Second interface 13 is oppositely arranged on the outer wall of the piston sleeve 11, and vertical with the piston sleeve 11.Described second
One end far from the piston sleeve 11 of interface 13 connects pressure vacuum gauge 3, and the pressure vacuum gauge 3 connects by described second
Mouth 13 is connected to the piston sleeve 11.
Optionally, in one embodiment of this specification, the sealing element 2 is end cover, the end cover tool
There is end cap mouth, the first interface 12 can extend into and seal cooperation in the end cap mouth.Preferably, the first interface 12
Outside and/or the end cap mouth of the end cover be equipped with the first sealing ring 21, the end cover and the first interface
12 are tightly connected by first sealing ring 21.In another embodiment of this specification, the sealing element 2 is sealing-plug
Not shown, the sealing-plug can seal cooperation in the inner cavity of the first interface 12.In this way, avoiding examining in the air-tightness
Gas leakage when surveying self-check of device, causes self-detection result mistake.
Specifically, the piston switch 4 includes piston rod 41,42 and of first piston that 41 end of piston rod is arranged in
The second piston 43 of 41 bar portion of piston rod is set, the first piston 42 protrudes into the inner cavity of the second end 112,
Under the drive of the piston rod 41, the first piston 42 can be sealed far from the first end 111 or with first end 111
Cooperation, the second piston 43 cooperate with the second end 112 sealing.
Further, the internal diameter of the first end 111 is less than the internal diameter of the second end 112, the second end
It is set on 112 inner sidewall there are two aperture 113, two apertures 113 connect with the first interface 12 and described second respectively
Mouth 13 is connected to, and for the first piston 42 with after the first end 111 cooperation, part first piston 42 is located at the second end
In 112 inner cavity, the inner sidewall of the first piston 42, the second piston 43 and the second end 112 forms cyclic annular sky
Chamber 15, the ring cavity 15 are connected to the first interface 12 and second interface 13 respectively by two apertures 113.It is excellent
Selection of land, two apertures 113 are arranged on the same radial section of the piston sleeve 11.
The outer diameter of the first piston 42 is less than the outer diameter of the second piston 43, by the separate of the piston rod 41
One end of the first piston 42 pushes or pulls, under the drive of the piston rod 41, the second piston 43 and institute
First piston 42 is stated to move reciprocatingly along the axial direction in the piston sleeve 11.The first piston 42 passes through the second end
It is tightly connected after 112 with first end 111；The second piston 43 is along two limit positions that the piston sleeve 11 is axially moved
It sets in the inner cavity of the second end 112, i.e., when the piston rod 41 moves, the second piston 43 is always with described the
The bore seal of two ends 112 cooperates.Also, the second piston 43 is always positioned at the aperture 113 and the second end
Between 112 end face far from the first end 111.I.e. no matter the second piston 43 moves to any of piston sleeve 11
Position, the second piston 43 all will not be between the aperture 113 and the first ends 111.
Further, the first piston 42 is equipped with the first sealing ring 21, sets the second sealing in the second piston 43
Circle 44.
Preferably, the first piston 42 is spirally connected with the first end 111, the second piston 43 and the second end
Portion 112 is spirally connected.The end of the first piston 42 is equipped with the first external screw thread, the inner wall of the first end 111 be equipped with
First internal screw thread of the first external screw thread cooperation, the first piston 42 are screwed onto the inner cavity of the first end 111；Institute
The outer wall for stating second piston 43 is equipped with the second external screw thread, and the inner wall of the second end 112 is equipped with and the described second outer spiral shell
Second internal screw thread of line cooperation, the second piston 43 are screwed onto the inner cavity of the second end 112.
Specifically, the piston rod 41 has the holding end 46 far from the first piston 42, and the holding end 46 is located at
Outside the second end 112.Preferably, the outer diameter of the holding end 46 is greater than the internal diameter of the piston sleeve 11.
Preferably, limited location snap ring 47 is additionally provided on the piston rod 41, the limited location snap ring 47 is arranged in the holding end
Between 46 and the second piston 43；The inner wall of the piston sleeve 11 is equipped with positioning fastener 48, and the first piston 42 is remote
When from the first end 111, the positioning fastener 48 can be connected in the second piston 43, the first piston 42 with
When the sealing of first end 111 cooperation, the positioning fastener 48 is connected on the limited location snap ring 47.The limited location snap ring
47, the second piston 43 and piston rod 41 between the two form I-shaped structure, and the positioning fastener 48 is located at the work
In the sunk structure of font.It so, it is possible to position two limit that the second piston 43 moves in the piston sleeve 11
Position, avoid apply the excessive damage instrument of pulling force, or apply thrust it is too small, do not have first piston 42 and first end 111
Cooperation is fully sealed.
Preferably, the positioning fastener 48 is flexible clamp piece, and the flexible clamp piece can be along the diameter of the piston sleeve 11
To flexible.In one embodiment, the second piston 43 has the first guiding oblique towards the side of the first end 111
Face, the second piston 43 have the second guiding surface towards the side of the limited location snap ring 47, and first guiding surface makes
After the flexible clamp piece compression, the second piston 43 is able to enter between the flexible clamp piece and the first end 111；Institute
After stating the second guiding surface and compressing the flexible clamp piece, the second piston 43 can move and exit the piston sleeve
11.So, it is ensured that piston switch 4 is detachably connected with piston sleeve 11, replaces the second sealing ring 44 and third sealing ring in time
45。
Further, the air-tightness detection device further includes transfer tube 14, and the transfer tube 14 is sealedly connected on described
The end point of first end 111, the first end are connected to by the transfer tube 14 with the vaccum-pumping equipment.
The transfer tube 14 has muff joint and vacuum adapter, and the first end 111 is protruded into the muff joint
In inner cavity；The vacuum adapter stretches out the first end 111.Preferably, the muff joint and 111 spiral shell of first end
It connects, the vacuum adapter is spirally connected with the pump-line 5.
Preferably, the pump-line 5 is equipped with pressure relief opening.
With reference to Fig. 1-4, on the basis of the above embodiment, the application method of the air-tightness detection device includes step
It is rapid:
S1. sealing element 2 is sealedly connected on the first interface 12 of pedestal 1, pressure vacuum gauge 3 is sealedly connected on
On two interfaces 13, vaccum-pumping equipment is sealedly connected on first end 111；
S2. apply pulling force on piston switch 4 and make it away from first end 111, open vaccum-pumping equipment pumping, record is true
First self-test value of hollow pressure gauge 3；
S3. applying thrust on piston switch 4 makes it seal cooperation with first end 111, when record is beyond the first setting
Between after pressure vacuum gauge 3 the second self-test value, the air-tightness is judged based on first self-test value and second self-test value
The air-tightness of detection device itself, however, it is determined that the air-tightness of the air-tightness detection device is qualified, then enters step S4；
Wherein, the gas of the air-tightness detection device itself is judged based on first self-test value and second self-test value
Close property, specifically, if second self-test value is less than or equal to first self-test value, the air-tightness of the air-tightness detection device
It is qualified；If second self-test value is greater than first self-test value, but the difference of second self-test value and first self-test value
Value is less than or equal to self-test error threshold, and the air-tightness of the air-tightness detection device is qualified；If second self-test value is greater than institute
The first self-test value is stated, but the difference of second self-test value and first self-test value is greater than self-test error threshold, it is described airtight
The air-tightness of property detection device is unqualified；
S4. the sealing element 2 on the first interface 12 is unloaded, LWD instrument 6 to be measured and the first interface 12 are sealed
Connection applies pulling force on piston switch 4 and makes it away from first end 111, opens vaccum-pumping equipment pumping, records vacuum pressure
First detected value of table 3；
Wherein, the LWD instrument 6 is equipped with air-leakage test interface, and first connector protrudes into and seals cooperation described
In air-leakage test interface.
S5. applying thrust in piston switch 4 makes it seal cooperation with first end 111, and record exceeds the first setting time
Second detected value of pressure vacuum gauge 3 afterwards judges the airtight of the LWD instrument 6 based on first detected value and the second detected value
Whether property is qualified.
Wherein, judge whether the air-tightness of the LWD instrument is qualified based on first detected value and the second detected value, specifically
For if second detected value is less than or equal to first detected value, the air-tightness of the LWD instrument is qualified；If second inspection
Measured value is greater than first detected value, but the difference of second detected value and first detected value is less than or equal to detection error
The air-tightness of threshold value, the LWD instrument is qualified；If second detected value is greater than first detected value, but second detection
Value and the difference of first detected value are greater than detection error threshold value, and the air-tightness of the LWD instrument is unqualified.
The utility model is not needing to increase additional test equipment by the way that sealing element 2 is arranged in second interface 13
Or in the case where changing test condition, realize every time using the leakproofness self-test before air-tightness detection device, it is ensured that LWD instrument is airtight
The accuracy of property testing result；And the utility model reduces valve switch etc. relative to traditional air-tightness detection device
Components avoid running negative gas at valve switch, improve the reliability and accuracy of sealing propertytest；In addition, the utility model
Simple and compact for structure, compact is easily installed and processes, and manufacturing cost is effectively reduced and improves working efficiency.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, all practical at this
Within novel spirit and principle, any modification, equivalent replacement, improvement and so on should be included in the guarantor of the utility model
Within the scope of shield.
Claims (9)
1. a kind of LWD instrument air-tightness detection device with self-checking function characterized by comprising
Including piston sleeve (11) and first interface (12) on the piston sleeve (11) wall and the is arranged in pedestal (1)
Two interfaces (13), the piston sleeve (11) have hollow cavity, the first interface (12), second interface (13) and the work
The hollow cavity of plug sleeve (11) is connected to, and the piston sleeve (11) includes the first end (111) and the second end of connection
(112), the first end (111) is connected to vaccum-pumping equipment；
Sealing element (2) is connect with the first interface (12) removable seal；
Pressure vacuum gauge (3) is sealedly connected on the second interface (13)；
Piston switch (4), is protruded into the hollow cavity of the piston sleeve (11), and the piston switch (4) passes through in the work
It moves reciprocatingly in the hollow cavity of plug sleeve, it can be far from the first end (111) or close with the first end (111)
Envelope cooperation, by the piston switch (4) and the first end (111) sealing cooperate, the piston sleeve (11) with it is described
Vaccum-pumping equipment disconnects connection.
2. air-tightness detection device according to claim 1, which is characterized in that the sealing element (2) is end cover
Or sealing-plug.
3. air-tightness detection device according to claim 1, which is characterized in that the first interface (12) and/or described
Sealing element (2) is equipped with the first sealing ring (21).
4. air-tightness detection device according to claim 1, which is characterized in that the piston switch (4) includes piston rod
(41), it is arranged and lives in the first piston (42) of the piston rod (41) end and setting the second of the piston rod (41) bar portion
It fills in (43), the first piston (42) protrudes into the inner cavity of the second end (112), under the drive of the piston rod (41),
The first piston (42) can seal cooperation far from the first end (111) or with first end (111), and described second is living
(43) and the second end (112) sealing is filled in cooperate.
5. air-tightness detection device according to claim 4, which is characterized in that the internal diameter of the first end (111) is small
Internal diameter in the second end (112), sets that there are two aperture (113), two institutes on the inner sidewall of the second end (112)
It states aperture (113) to be connected to the first interface (12) and the second interface (13) respectively, the first piston (42) and institute
After stating first end (111) cooperation, part first piston (42) is located in the inner cavity of the second end (112), and described first
The inner sidewall of piston (42), the second piston (43) and the second end (112) forms ring cavity (15), the ring-type
Cavity (15) is connected to the first interface (12) and second interface (13) respectively by two apertures (113).
6. air-tightness detection device according to claim 4, which is characterized in that the first piston (42) is equipped with second
Sealing ring (44) sets third sealing ring (45) on the second piston (43).
7. air-tightness detection device according to claim 4, which is characterized in that the first piston (42) and described first
End (111) is spirally connected, and the second piston (43) is spirally connected with the second end (112).
8. air-tightness detection device according to claim 4, which is characterized in that the piston rod (41) has far from described
The holding end (46) of first piston (42), the holding end (46) stretch out the second end (112)；
Be additionally provided with limited location snap ring (47) on the piston rod (41), the limited location snap ring (47) setting the holding end (46) with
Between the second piston (43)；
The inner wall of the piston sleeve (11) is equipped with positioning fastener (48), and the first piston (42) is far from the first end
(111) when, the positioning fastener (48) can be connected on the second piston (43), the first piston (42) and described the
When one end (111) sealing cooperation, the positioning fastener (48) is connected on the limited location snap ring (47).
9. air-tightness detection device according to claim 1, which is characterized in that further include transfer tube (14), the switching
Pipe (14) is sealedly connected on the end point of the first end (111), and the first end passes through the transfer tube (14) and institute
State vaccum-pumping equipment connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822030258.2U CN209280236U (en) | 2018-12-05 | 2018-12-05 | LWD instrument air-tightness detection device with self-checking function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822030258.2U CN209280236U (en) | 2018-12-05 | 2018-12-05 | LWD instrument air-tightness detection device with self-checking function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209280236U true CN209280236U (en) | 2019-08-20 |
Family
ID=67609771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822030258.2U Expired - Fee Related CN209280236U (en) | 2018-12-05 | 2018-12-05 | LWD instrument air-tightness detection device with self-checking function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209280236U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109323824A (en) * | 2018-12-05 | 2019-02-12 | 贝兹维仪器(苏州)有限公司 | LWD instrument air-tightness detection device with self-checking function |
-
2018
- 2018-12-05 CN CN201822030258.2U patent/CN209280236U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109323824A (en) * | 2018-12-05 | 2019-02-12 | 贝兹维仪器(苏州)有限公司 | LWD instrument air-tightness detection device with self-checking function |
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