CN110284838A - Pipe device under a kind of construction drilling well - Google Patents
Pipe device under a kind of construction drilling well Download PDFInfo
- Publication number
- CN110284838A CN110284838A CN201910582811.XA CN201910582811A CN110284838A CN 110284838 A CN110284838 A CN 110284838A CN 201910582811 A CN201910582811 A CN 201910582811A CN 110284838 A CN110284838 A CN 110284838A
- Authority
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- China
- Prior art keywords
- pipe
- unlock
- well casing
- drilling well
- inclined plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000005553 drilling Methods 0.000 title claims abstract description 22
- 238000010276 construction Methods 0.000 title claims abstract description 13
- 230000000694 effects Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 7
- 230000005484 gravity Effects 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The present invention relates to pipe devices under a kind of construction drilling well, and pipe device includes hanger, hollow pipe, lever arm, shed stick, locating slide sleeve under the drilling well；Lever arm lower end is equipped with " 7 " letter stencil, " 7 " letter stencil includes inclined plate and supporting plate, tongue apertures is offered in hollow tube wall, positioning device is installed in the tongue apertures, the positioning device includes positioning tongue, it is provided with unlock feeler lever in the hollow pipe, touching ring is provided on the unlock feeler lever, the unlock feeler lever top is provided with drawing ear；Pipe device is equipped with automatic unlocking mechanism under the drilling well；When the present invention transfers well casing, when close to the well casing of lower section, well casing to be transferred can unload pipe automatically, facilitate dispensing, convenient for withdrawing lower pipe device；Concentricity is higher between the well casing of decentralization simultaneously, solves the problems, such as to deviate between well casing.
Description
Technical field
The present invention relates to pipe devices under building instrument field more particularly to a kind of construction drilling well.
Background technique
In building engineering field, drilling well is that stratum is drilled to using mechanical equipment or manpower from ground the work of eyelet.It is logical
Often refer to the engineering of the liquid and gaseous state mineral products and Drilling wellbore and major diameter water supply well such as exploration or exploitation petroleum, natural gas.
It in the drillng operation later period, needs to transfer to well casing in the well head being drilled, it is therefore an objective to prevent landslide in well, well casing rises
To the effect of retaining wall.When the depth of well is deeper, more piece well casing is generally needed successively to be placed in well head down, is then put off with one heart one
It rises and constitutes a well casing communicated.But well casing is mostly columned hollow pipe, in down tube operation, mechanical equipment is difficult to it
It clamps.
Summary of the invention
The present invention in order to overcome the shortcomings in the prior art, provides pipe device under a kind of construction drilling well, this hair
It is bright to be applied to down tube operation in drillng operation, convenient for successively well casing is put off in the well head being drilled.
The present invention is achieved through the following technical solutions:
Pipe device under a kind of construction drilling well, under the drilling well pipe device include hanger, it is hollow pipe, lever arm, shed stick, fixed
Position sliding sleeve；
The hollow pipe and hanger right angle setting, the lever arm upper end and hanger are articulated and connected, lever arm and hanger hinged place
It is provided with spring；
The lever arm lower end is equipped with " 7 " letter stencil, and " 7 " letter stencil includes inclined plate and supporting plate, and the inclined plate tilts down；Institute
It states shed stick one end and inclined plate is articulated and connected, the shed stick other end and locating slide sleeve are articulated and connected, and the locating slide sleeve is sleeved on hollow
On the outside of pipe；
Tongue apertures is offered in the hollow tube wall, positioning device is installed in the tongue apertures, the positioning device includes positioning
Tongue is provided with unlock feeler lever in the hollow pipe, touching ring is provided on the unlock feeler lever, the unlock feeler lever top is provided with
Draw ear.
Pipe device is equipped with automatic unlocking mechanism under the drilling well, the automatic unlocking mechanism include touch panel, unlock rod A,
Unlock rod B, the unlock rod A are sleeved in lever arm, and the one end unlock rod B and unlock rod A are hinged, the unlock rod B other end and solution
It is hinged to lock feeler lever；The lower end the unlock rod A passes through inclined plate, and the lower end unlock rod A and touch panel are articulated and connected.
It is provided with spring between the unlock rod A and inclined plate, under spring force effect, the lower end and inclined plate lower end of touch panel
It draws close.
Roller bearing is installed, roller bearing exposes from splint upper surface below the supporting plate.
Compared with prior art, the beneficial effects of the present invention are: a kind of construction of the invention is filled with drilling well down tube
It sets, which is provided with " 7 " letter stencil in the lower end of lever arm, and supporting plate transfers from well casing and holds up well casing, thus by under well casing
It is placed in well head；
When the present invention transfers well casing, when close to the well casing of lower section, well casing to be transferred can unload pipe automatically, facilitate dispensing, be convenient for
Withdraw lower pipe device；Concentricity is higher between the well casing of decentralization simultaneously, solves the problems, such as to deviate between well casing.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Structural schematic diagram when Fig. 2 is working condition of the invention, upper well casing does not break off relations in figure；
Structural schematic diagram when Fig. 3 is working condition of the invention, upper well casing has broken off relations in figure；
Structural schematic diagram of the Fig. 4 between locating slide sleeve and hollow pipe of the invention, positioning tongue is lockup state in figure；
Structural schematic diagram of the Fig. 5 between locating slide sleeve and hollow pipe of the invention, positioning tongue is unlocked state in figure；
Partial enlarged view when Fig. 6 is " 7 " letter stencil work of the invention；
Fig. 7 is the structural schematic diagram of positioning device of the invention；
Fig. 8 is structural schematic diagram of the invention, and the present invention is provided with automatic unlocking mechanism in figure.
In figure: 1, hanger；101, hinge column；102, connecting rod；103, hangers；
2, hollow pipe；201, side opening；202, tongue apertures；
3, lever arm；
4, " 7 " letter stencil；401, inclined plate；402, supporting plate；403, roller bearing；
5, shed stick；
6, automatic unlocking mechanism；601, touch panel；602, unlock rod A；603, unlock rod B；
7, locating slide sleeve；
8, positioning device；801, positioning tongue；8011, the end positioning tongue A；8012, the end positioning tongue B；802, shaft；803, torsional spring；
804, limited post；805, installing frame；
9, feeler lever is unlocked；901, ring is touched；902, tension spring；903, ear is drawn；
10, upper well casing；11, downhole pipe.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
In engineering applications such as construction, oil exploitation, minings, is often bored because of requirement of engineering in building site and dig certain depth
Well.Due to geological materials, the well being drilled needs to place well casing in well again, to prevent from caving in well.Due to the depth of well
Degree is deeper, and general well casing mostly uses the more piece well casing of certain specification successively to slap together.Well casing majority be steel pipe or pipe of cement,
The inner and outer wall of well casing is all smooth, no any place fixed for lifting appliance.Under the conditions of the prior art, generally adopt
It is wrapped on well casing on the outside of well casing with tightrope, or takes and prop up well casing on the inside of well casing, sling well casing using frictional force.This
Easily there is the risk that well casing falls off during lifting in a little hanging methods or device.Using the dress for propping up well casing on the inside of well casing
Set also easily cement well pipe is supportted it is bad.
To solve technical problem under the conditions of the prior art, as shown in Figure 1, the present invention provides a kind of construction drilling wells
Lower pipe device, pipe device includes hanger 1, hollow pipe 2, lever arm 3, shed stick 5, locating slide sleeve 7 under the drilling well；Hanger 1 is circle
Ring-type passes through the hangers 103 that connecting rod 102 is connect with hanger 1 as shown in Fig. 2, being provided with above hanger 1.
The hollow pipe 2 and 1 right angle setting of hanger, 3 upper end of lever arm and hanger 1 are articulated and connected, 3 upper end of lever arm
It is connect with the hinge column 101 on hanger 1, lever arm 3 can be swung on the radius of hanger 1, in lever arm 3 and 1 hinged place of hanger
It is provided with spring；Under the elastic force effect of spring, lever arm 3 has the tendency that being unfolded outward.
As shown in Fig. 2, the present invention is penetrated upper well casing 10 from the lower end of upper well casing 10, is then passed through when lifting well casing
Hangers 103 hangs over the present apparatus on lifting appliance, convenient for slinging well casing and putting it into well head.
Well casing is sling to realize, as shown in Figure 1, Figure 2, Figure 6 shows, " 7 " letter stencil 4 is installed in 3 lower end of lever arm, it is described
" 7 " letter stencil 4 includes inclined plate 401 and supporting plate 402, and supporting plate 402 is arranged outward, holds up, matches from upper 10 lower section of well casing by upper well casing 10
Can smoothly upper well casing 10 be sling so that upper well casing 10 is not easy to slip by closing the trend that lever arm 3 is unfolded outward.
As shown in figure 1, figure 2, figure 3 and figure 6, the inclined plate 401 of " 7 " letter stencil 4 is set as inclined plate 401 and tilts down；Multiple activities
Inclined plate 401 on arm 3 tilts down, together towards hollow pipe 2.So set, its object is to: put under well casing 10 to
When inclined plate 401 and downhole pipe 11 suitable for reading contacts, well casing 10 is put under continuing, since the gravity pressure of upper well casing 10 is in supporting plate
On 402, inclined plate 401 under gravity can along nozzle into downhole pipe 11 side slip, while lever arm 3 being overcome to be unfolded outward
Trend so that multiple lever arms 3 simultaneously to centre collapse.During gathering, upper 10 lower end of well casing connects with supporting plate 402
Contacting surface is smaller and smaller, until downhole pipe 11 falls off from supporting plate 402, piles up in downhole pipe 11, then by the present apparatus from Shang Jing
It is hung out in pipe 10.Both it had realized and had piled up upper well casing 10 in downhole pipe 11, also achieved upper well casing 10 from the present apparatus
Upper unhook.
Simultaneously as the inclined plate 401 on multiple lever arms 3 is located on same circular conical surface, during declining upper well casing 10,
The cooperation jointly of multiple inclined plates 401, has the function of for upper well casing 10 being aligned with the axis of downhole pipe 11, thus after down tube well casing it
Between concentricity it is higher, avoid and deviated between well casing.
Rise hang on well casing 10 when, to further avoid the risk that upper well casing 10 falls off from the present apparatus.The present apparatus also fills
A set of anticreep lockable mechanism is matched.As shown in Fig. 1, Fig. 3, Fig. 2, described 5 one end of shed stick and inclined plate 401 are articulated and connected, and shed stick 5 is another
One end and locating slide sleeve 7 are articulated and connected, and the locating slide sleeve 7 is sleeved on 2 outside of hollow pipe；With the expansion of lever arm 3, receive
Hold together, locating slide sleeve 7 on hollow pipe 2 can downwards, move up.When the gravity of upper well casing 10 is on supporting plate 402, positioning
Sliding sleeve 7 has along 2 uptrend of hollow pipe.Therefore, it is located on hollow pipe 2 above locating slide sleeve 7 and is provided with positioning device 8.
As shown in figure 4, offering tongue apertures 202 in 2 tube wall of hollow pipe, positioning device is installed in the tongue apertures 202
8.As shown in fig. 7, the positioning device 8 includes positioning tongue 801, it further include installing frame 805, torsional spring 803, shaft 802, positioning tongue
801 are mounted on installing frame 805 by shaft 802.After torsional spring 803 cooperates limited post 804, the positioning tongue A under its twisting force
End 8011 is protruding on hollow pipe 2, and locating slide sleeve 7 is prevented to move from bottom to top.
As shown in Figure 4, Figure 5, while in hollow pipe 2 it is provided with unlock feeler lever 9, is provided with touching on the unlock feeler lever 9
Ring 901,9 top of unlock feeler lever, which is provided with, draws ear 903.Connection stay cord on ear 903 is drawn, positioning tongue 801 is right when needing to unlock
When the locking of locating slide sleeve 7, unlock feeler lever 9 is pulled up by drawstring.So that touching ring 901 stirs the end positioning tongue B of positioning tongue 801
8012, positioning tongue 801 is dialed up, so that its overturning to the end positioning tongue A 8011 is retracted hollow pipe 2, positioning is slided to release
The locking of set 7.For convenient for unlocking 9 return of feeler lever, unlock 9 lower end of feeler lever is connect with 2 lower end of hollow pipe by tension spring 902, tension spring
902 pulling force is convenient for its reset.
To further facilitate unlock positioning tongue 801 to the locking of locating slide sleeve 7, pipe device is equipped under drilling well of the invention
Automatic unlocking mechanism 6, as shown in Fig. 6, Fig. 2, Fig. 8, the automatic unlocking mechanism 6 includes touch panel 601, unlock rod A602, unlock
Bar B603, while side opening 201 is offered on lever arm 3 and hollow pipe 2.The unlock rod A602 is sleeved in lever arm 3,
The one end unlock rod B603 and unlock rod A602 are hinged, and the unlock rod B603 other end and unlock feeler lever 9 are hinged；The unlock rod A602
Lower end passes through inclined plate 401, and the lower end unlock rod A602 and touch panel 601 are articulated and connected, and the setting of touch panel 601 is in 401 outside of inclined plate, touch panel
Distance is separated between 601 and inclined plate 401.As shown in Fig. 6, Fig. 2, when putting well casing 10 under, the touch panel of the automatic unlocking structure 6
601 contact prior to inclined plate 401 with the suitable for reading of downhole pipe 11, during upper well casing 10 continues decline, push touch panel 601 to inclined plate
401 hold together, to push unlock rod A602, unlock rod A602 linkage of unlocking bar B603, unlock rod B603 linkage of unlocking feeler lever 9 will
It unlocks feeler lever 9 to push up upwards, so that touching ring 901 stirs positioning tongue 801.It realizes when upper well casing 10 drops in downhole pipe 11
When mouth, automatic unlocking positioning tongue 801 pulls unlock feeler lever 9 to unlock the locking of locating slide sleeve 7 without passing through drawstring.
Meanwhile it being provided with spring between the unlock rod A602 and inclined plate 401, and under spring force effect, touch panel 601
Lower end drawn close with 401 lower end of inclined plate.Such setting is easy for upper well casing 10 and 11 concentric fits of downhole pipe.
As shown in Fig. 1, Fig. 6, roller bearing 403 is installed below the supporting plate 402, roller bearing 403 reveals from 402 upper surface of supporting plate
Out.So set, being for the ease of when breaking off relations, upper well casing 10 is detached from from supporting plate 402.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (4)
1. pipe device under a kind of construction drilling well, it is characterised in that: under the drilling well pipe device include hanger (1), it is hollow
Manage (2), lever arm (3), shed stick (5), locating slide sleeve (7)；
The hollow pipe (2) and hanger (1) right angle setting, lever arm (3) upper end and hanger (1) are articulated and connected, lever arm
(3) hanger (1) hinged place is provided with spring；
Lever arm (3) lower end is equipped with " 7 " letter stencil (4), and " 7 " letter stencil (4) includes inclined plate (401) and supporting plate (402),
The inclined plate (401) tilts down；Described shed stick (5) one end and inclined plate (401) are articulated and connected, shed stick (5) other end and positioning
Sliding sleeve (7) articulated connection, the locating slide sleeve (7) are sleeved on the outside of hollow pipe (2)；
In the hollow pipe (2), tube wall is offered tongue apertures (202), is equipped with positioning device (8) in the tongue apertures (202), described
Positioning device (8) includes positioning tongue (801), is provided in the hollow pipe (2) and unlocks feeler lever (9), on the unlock feeler lever (9)
It is provided with touching ring (901), unlock feeler lever (9) top, which is provided with, draws ear (903).
2. pipe device under a kind of construction drilling well according to claim 1, it is characterised in that: the drilling well down tube dress
Set and be equipped with automatic unlocking mechanism (6), the automatic unlocking mechanism (6) includes touch panel (601), unlock rod A(602), unlock rod B
(603), the unlock rod A(602) be sleeved in lever arm (3), unlock rod B(603) one end and unlock rod A(602) hingedly, solution
Locking bar B(603) other end and unlock feeler lever (9) it is hinged；
The unlock rod A(602) lower end passes through inclined plate (401), unlock rod A(602) lower end and touch panel (601) are articulated and connected.
3. pipe device under a kind of construction drilling well according to claim 2, it is characterised in that: the unlock rod A
(602) it is provided with spring between inclined plate (401), under spring force effect, under the lower end and inclined plate (401) of touch panel (601)
End is drawn close.
4. pipe device under a kind of construction drilling well according to claim 1, it is characterised in that: the supporting plate (402)
Lower section is equipped with roller bearing (403), and roller bearing (403) exposes from supporting plate (402) upper surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910582811.XA CN110284838B (en) | 2019-07-01 | 2019-07-01 | Drilling pipe lowering device for building construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910582811.XA CN110284838B (en) | 2019-07-01 | 2019-07-01 | Drilling pipe lowering device for building construction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110284838A true CN110284838A (en) | 2019-09-27 |
| CN110284838B CN110284838B (en) | 2021-04-06 |
Family
ID=68021428
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910582811.XA Active CN110284838B (en) | 2019-07-01 | 2019-07-01 | Drilling pipe lowering device for building construction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110284838B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110820779A (en) * | 2019-11-20 | 2020-02-21 | 中国建筑第八工程局有限公司 | Well pipe lowering device and construction method thereof |
| CN113187381A (en) * | 2021-03-19 | 2021-07-30 | 中基发展建设工程有限责任公司 | High-water-length spiral well forming construction process |
| CN115163007A (en) * | 2022-07-15 | 2022-10-11 | 黄河勘测规划设计研究院有限公司 | Integrated well wall repairing device and well wall water permeation repairing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5551521A (en) * | 1994-10-14 | 1996-09-03 | Vail, Iii; William B. | Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells |
| US6059052A (en) * | 1996-10-16 | 2000-05-09 | Haggard; Archie | External pipe wiping apparatus and method of pulling and wiping a pipe string |
| CN203271632U (en) * | 2013-05-10 | 2013-11-06 | 淮南矿业(集团)有限责任公司 | Sleeve holder and lower sleeve device |
| CN203682898U (en) * | 2014-01-20 | 2014-07-02 | 湖北襄玉机械有限公司 | Disc lifting tool assembly device for preprocessing steel |
| CN208631939U (en) * | 2018-08-10 | 2019-03-22 | 杭州敦实金属制品有限公司 | A kind of hoisting auxiliary device playing sling cart for steel wire |
-
2019
- 2019-07-01 CN CN201910582811.XA patent/CN110284838B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5551521A (en) * | 1994-10-14 | 1996-09-03 | Vail, Iii; William B. | Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells |
| US6059052A (en) * | 1996-10-16 | 2000-05-09 | Haggard; Archie | External pipe wiping apparatus and method of pulling and wiping a pipe string |
| CN203271632U (en) * | 2013-05-10 | 2013-11-06 | 淮南矿业(集团)有限责任公司 | Sleeve holder and lower sleeve device |
| CN203682898U (en) * | 2014-01-20 | 2014-07-02 | 湖北襄玉机械有限公司 | Disc lifting tool assembly device for preprocessing steel |
| CN208631939U (en) * | 2018-08-10 | 2019-03-22 | 杭州敦实金属制品有限公司 | A kind of hoisting auxiliary device playing sling cart for steel wire |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110820779A (en) * | 2019-11-20 | 2020-02-21 | 中国建筑第八工程局有限公司 | Well pipe lowering device and construction method thereof |
| CN113187381A (en) * | 2021-03-19 | 2021-07-30 | 中基发展建设工程有限责任公司 | High-water-length spiral well forming construction process |
| CN113187381B (en) * | 2021-03-19 | 2023-11-21 | 中基发展建设工程有限责任公司 | High-water-level long-spiral well formation construction process |
| CN115163007A (en) * | 2022-07-15 | 2022-10-11 | 黄河勘测规划设计研究院有限公司 | Integrated well wall repairing device and well wall water permeation repairing method |
| CN115163007B (en) * | 2022-07-15 | 2023-10-17 | 黄河勘测规划设计研究院有限公司 | Integrated well wall repairing device and well wall water permeability repairing method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110284838B (en) | 2021-04-06 |
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Effective date of registration: 20210111 Address after: Room 2202, 22 / F, Wantong building, No. 3002, Sungang East Road, Sungang street, Luohu District, Shenzhen City, Guangdong Province Applicant after: SHENZHEN LOTUT INNOVATION DESIGN Co.,Ltd. Address before: 231440 Jintian Jiayuan, Jinwang Road South, Jinshen Town, Tongcheng, Anqing, Anhui, China, 38 Applicant before: TONGCHENG PAITENG MACHINERY DESIGN Co.,Ltd. |
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Effective date of registration: 20210129 Address after: 239300 No.518 Tianye Road, Tianchang City, Chuzhou City, Anhui Province Applicant after: ANHUI YUJIA CONSTRUCTION GROUP Co.,Ltd. Address before: Room 2202, 22 / F, Wantong building, No. 3002, Sungang East Road, Sungang street, Luohu District, Shenzhen City, Guangdong Province Applicant before: SHENZHEN LOTUT INNOVATION DESIGN Co.,Ltd. |
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