CN105952378A - Tree-shape structure well drilling and completion and yield increasing method - Google Patents
Tree-shape structure well drilling and completion and yield increasing method Download PDFInfo
- Publication number
- CN105952378A CN105952378A CN201610310324.4A CN201610310324A CN105952378A CN 105952378 A CN105952378 A CN 105952378A CN 201610310324 A CN201610310324 A CN 201610310324A CN 105952378 A CN105952378 A CN 105952378A
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- capillary tube
- tree
- well
- completion
- shape structure
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- 238000005553 drilling Methods 0.000 title claims abstract description 29
- 210000001736 Capillaries Anatomy 0.000 claims abstract description 50
- 210000002445 Nipples Anatomy 0.000 claims abstract description 24
- 239000011435 rock Substances 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000002253 acid Substances 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 claims description 7
- 238000005755 formation reaction Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 230000000903 blocking Effects 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 241001074085 Scophthalmus aquosus Species 0.000 claims description 4
- 238000005530 etching Methods 0.000 claims description 4
- 230000000638 stimulation Effects 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 2
- ZEGPTFVBNBCAHZ-LMFJUDGVSA-N 2-[[(1E,4E)-1,5-bis(5-nitrofuran-2-yl)penta-1,4-dien-3-ylidene]amino]guanidine;hydrochloride Chemical compound Cl.C=1C=C([N+]([O-])=O)OC=1\C=C\C(=NN=C(N)N)\C=C\C1=CC=C([N+]([O-])=O)O1 ZEGPTFVBNBCAHZ-LMFJUDGVSA-N 0.000 claims 1
- 239000011229 interlayer Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 8
- 239000007788 liquid Substances 0.000 abstract description 2
- 238000005086 pumping Methods 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 14
- 239000000243 solution Substances 0.000 description 14
- 238000009434 installation Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004088 simulation Methods 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/06—Deflecting the direction of boreholes
- E21B7/061—Deflecting the direction of boreholes the tool shaft advancing relative to a guide, e.g. a curved tube or a whipstock
-
- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
-
- 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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0035—Apparatus or methods for multilateral well technology, e.g. for the completion of or workover on wells with one or more lateral branches
-
- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
-
- 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
- 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
Abstract
The invention discloses a tree-shape structure well drilling and completion and yield increasing method comprising the following steps: 1, overall scheme design: designing the tree-shape structure well overall well body structure, the drilling and completion scheme, and acidifying yield increase; 2, tree-shape structure well drilling: using a ground pumping to supercharge, allowing flexible capillaries arranged in capillary pipe nipples to extend outside under the internal and external differential pressure effect, using high pressure water jet to break rocks, and using acidifying liquid to etch stratum rocks so as to drill branch minimal boreholes; 3, tree-shape structure well completion: setting a casing suspender and pulling the drilling tool, lowering an oil pipe to tie-back with the casing suspender, thus finishing completion work. The beneficial effects are that the tree-shape structure well can be constructed with high efficiency, safety and low cost, thus providing obvious economical benefits, and wide application prospect.
Description
Technical field
The present invention relates to a kind of tree well is drilled well and method for increasing, belongs to petroleum drilling and mining field.
Background technology
Multilevel branch well refers to get out some entrance oil-gas reservoir in a bite main borehole (straight well, directional well, horizontal well)
Small branch well hole.This technology is utilized can effectively to exploit old liberated area residue oil reservoir, low-permeability oil deposit, compact oil reservoir and unconventional
Petroleum resources etc., it is possible to be applied to the exploitation of the resources such as underground heat, coal bed gas resource and subsoil water.
The main method being presently used for boring the small well of multilevel branch is to utilize drilling tool in sleeve position in cased well
Get out bullport, under enter the high pressure flexible tube with water jet drill, pump in flexible pipe by being connected to the pump truck on ground
Cleaner for high-pressure drilling fluid, utilizes high-pressure water jet to carry out brokenly rock thus realizes boring the operation of branch's Microdrilling.But the method has: need
The equipment wanting ground to support is many, and cost of equipment is high, long construction period, and once can be only done a branch drill through lack
Point so that oil field development benefit is affected.
Summary of the invention
It is an object of the invention to: the equipment needing ground to support for the method for the existing small well of brill multilevel branch is many, if
Standby costly, long construction period, and the shortcoming that once can only bore a branch well hole, it is proposed that a kind of new Multilateral Wells knot
Structure tree.In the drilling operation of tree well need not too much ground installation support, and one time bore can be complete
Become the construction method of all of branch Microdrilling.The method can increase oil gas well yield effectively, is particularly suitable for old
The exploitation that district's residue oil reservoir, low-permeability oil deposit, compact oil reservoir and unconventionaloil pool are hidden, and be not suitable for owing to various conditions limit
Fracturing is used to carry out the Oil/gas Well increased production.
In order to achieve the above object, the technical solution adopted for the present invention to solve the technical problems is: a kind of tree
Well be drilled well and method for increasing, it is characterised in that include following step:
(1) overall plan design.Integrated well body structure, brill completion program and the acid stimulation of tree well is designed；
(2) the drilling through of tree well.Utilize drilling tool by with the casing hanger of tie-back sleeve and casing hanger bottom institute
The completion tubular column connected is lowered into precalculated position.Inject acidifying solution by ground turn on pump or drilling fluid makes tubing string supercharging, inside and outside
The end being arranged in capillary tube pipe nipple under the effect of pressure reduction is provided with the protruding around property capillary tube of flow jet flow drill, utilizes height
Pressure water jet breaks rock and combines the acidifying solution acid etching to formation rock, reaches to drill through the purpose of branch's Microdrilling；
(3) completion of tree well.Setting sleeve pipe hanger, extracts drilling tool from the top tie-back sleeve of casing hanger,
And trip out drilling tool.Under enter flow string and with casing hanger tieback, complete completion practice.During production, gas stream is through capillary
Pipe enters main borehole annular space with the annular space of Microdrilling, passes through and is arranged on ball-and-seat entrance completion tubular column on capillary tube pipe nipple
In, after flow to ground through flow string.
The invention has the beneficial effects as follows: what (1) present invention can be rapidly completed tree well is drilled well construction, improves and executes
Work efficiency rate, shortens construction period.(2) flexible operation of the present invention, has wide range of applications, can be used for straight well, extended reach well and
The construction of horizontal well, is particularly suitable for exploiting old liberated area residue oil reservoir, low-permeability oil deposit, compact oil reservoir and unconventionaloil pool money
Source.(3) present invention uses simple, safe and reliable, can avoid the construction risk that fracturing well stimulation is brought.(4) this
Bright without too much ground installation support, and the preparation of construction work of complexity, save construction cost, there is obvious economy
Benefit, application prospect is extensive.
Accompanying drawing explanation
The present invention is further described with embodiment below in conjunction with the accompanying drawings.
Fig. 1 is the structural representation that the present invention bores tree well.
Fig. 2 is capillary tube pipe nipple structural representation of the present invention.
Fig. 3 is that capillary tube of the present invention stretches out capillary tube pipe nipple and carries out spraying the process schematic crept into.
Fig. 4 is flow jet flow drill schematic diagram of the present invention.
In figure: 1. drilling tool, 2. casing hanger, 3. capillary tube pipe nipple, 4. capillary tube, 5. tail pipe, 6. hydraulic pressure casing anchor
, 7. valve pipe shoe, 8. flow jet flow drill, 9. ball-and-seat, 10. sealing shroud, 11. blockings, 12. oblique holes, 13. stratum, 14. small wells
Eye thimble is empty, 15. main borehole annular spaces, 16. ground high pressure lines, 17. pumping-in equipments, 18. job platforms.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is described further:
As Figure 1-4, the present invention is used for exploiting old liberated area residue oil reservoir, low-permeability oil deposit, compact oil reservoir and unconventionaloil pool money
Source etc..By drilling through tree well, the drainage area increasing oil-gas reservoir improves Oil/gas Well yield.Its method is to utilize end
Be provided with flow jet flow drill 8 around property capillary tube 4, inject acidifying solution by ground turn on pump or drilling fluid make tubing string supercharging, inside and outside
Under the effect of pressure reduction, capillary tube 4 stretches out capillary tube pipe nipple 3, utilizes high-pressure water jet break rock and combine acidifying solution to formation rock
Acid etching, reaches to drill through the purpose of branch's Microdrilling.
Ground Operation platform 18 can be vehicle carried well repairing machine or rig, and pumping-in equipment 17 can be skid slush pump or pump
Car.
As Figure 1-4, a kind of tree well be drilled well and method for increasing, it comprises the following steps:
(1) overall plan design.Integrated well body structure, brill completion program and the acid stimulation of tree well is designed；
Step (1) mainly includes that operating tool string structure designs, construction parameter, the concentration of required acidifying solution and volume, ground line
Laying of line.Conceptual design is mainly considered to the type of oil-gas reservoir, size, structure and formation lithology, well temperature gradient, ground
Stressor layer coefficient.Make every effort to the communication area increasing main hole as far as possible with oil-gas reservoir, improve Oil/gas Well yield.For tubing string
Structure designs, and mainly in conjunction with petroleum geology situation, uses computer to carry out the well type of analogue simulation proving institute design to production capacity
Raising degree, and determine the sum of series total quantity of multilevel branch Microdrilling.In order to avoid tubing string elongation institute in work progress
The adverse effect brought.Tubular buckling software for calculation is utilized operating tool string to be carried out tubular buckling analysis, according to result at tubing string
In suitably increase hydraulic pressure casing anchor 6 and determine installation site.If any the demand of separate zone production, can arbitrarily add and subtract bore hole in tubing string
Packer.The determination of construction parameter, Main Basis formation rock parameter obtains operational discharge capacity required during jet drilling construction
And pressure.
(2) the drilling through of tree well.Utilize drilling tool 1 by with the casing hanger 2 of tie-back sleeve and casing hanger
The completion tubular column that bottom is connected is lowered into precalculated position.Inject acidifying solution by ground turn on pump and make tubing string supercharging, at interior external pressure
Be arranged in capillary tube pipe nipple 3 under the effect of difference is protruding around property capillary tube 4, utilizes high-pressure water jet to break rock combined acid
Change the liquid acid etching to formation rock, reach to drill through the purpose of branch's Microdrilling.Whole operating tool string structure includes from top to bottom:
Drilling tool 1, the casing hanger 2 of band tie-back sleeve, tail pipe 5, capillary tube pipe nipple 3, hydraulic pressure casing anchor 6, valve pipe shoe 7.Capillary tube pipe nipple 3
Quantity, depth of setting and the tail pipe between them 5 quantity by overall plan design determine.Each capillary tube pipe nipple 3 interior
Portion be provided with 3～5 a length of 8～11 meters long around property capillary tube 4.The end of every capillary 4 is provided with flow jet flow drill 8.
Capillary tube pipe nipple 3 is machined with the oblique hole 12 of 3～5 axial distribution, and the axis in this hole and the axis of pipe nipple are 40 ° of angles.Often
Individual oblique hole 12 is provided with a capillary 4, seals with sealing shroud 10 between capillary tube 4 and oblique hole 12.Sealing shroud
The end of 10 is provided with blocking 11, prevents the surge pressure during lower operating tool string from making capillary tube 4 stretch out.At work progress
In, when in tubing string, pressure reaches preset value, blocking 11 will be pumped out.
Step (2) mainly comprises the steps that
1, according to operating tool string under design team.According to the tubular column structure in global design carry out operating tool string connection and under enter.
Before tubing string enters well, in advance capillary tube pipe nipple 3 is connected with tail pipe 5 on ground and capillary tube 4 is installed.Capillary tube 4 is installed in
In the tail pipe 5 being connected with capillary tube pipe nipple 3 top, its end is fixed by sealing shroud 10.The bottom of operating tool string is provided with valve
Pipe shoe 7, during lower tubular column, in case of Open-Hole Section undergauge can enter under on one side by reaming.Valve pipe shoe 7 is with circulation port, it is ensured that
During lower tubular column, inside and outside tubing string, it is in connected state.When acidifying solution flows through valve pipe shoe 7, acidifying solution can trigger circulation port
Close.
2, ground installation pressure testing are connected.To behind precalculated position under operating tool string, will construction by ground high pressure line 16
Tubing string is connected with pumping-in equipment 17, and ground high pressure line 16 is carried out pressure testing.
3, spraying operation.The acidifying solution configured is injected in operating tool string by slush pump, when acidifying solution flows through valve
During pipe shoe 7, its circulation port is closed, and whole tubing string is in closed state.Continue to pump into acidifying solution, owing to building the pressure so that pressure in pipe
Increasing, when pressure reaches preset value, blocking 11 is pumped out, and flow jet flow drill 8 drives capillary tube 4 from capillary under the effect of pressure reduction
Pipe pipe nipple 3 stretches out.Rely on high-pressure water jet and combine the acidifying solution acid corrosion action to formation rock, reaching the mesh of fractured rock
's.Rock debris enters tail pipe 5 and main borehole annular space 15 by the annular space 14 of capillary tube 4 with Microdrilling, then hangs through sleeve pipe
The pit shaft of hanging device more than 2 is discharged.Continue pump into acidifying solution and keep certain pump pressure to make capillary tube 4 protrude fully into stratum
In.In whole work progress, all of capillary tube 4 stretches out simultaneously and completes drilling through of branch's Microdrilling.In whole injection
During, hydraulic pressure casing anchor 6 is in anchoring states and prevents tubing string from extending.After construction terminates, all capillary tubies 4 will be left permanently in point
Prop up in Microdrilling to play the effect supporting well.
(3) completion of tree well.Setting sleeve pipe hanger, reclaim drilling tool and under enter flow string and carry out tieback, peace
Dress wellhead assembly, completes completion practice.
Step (3) mainly comprises the steps that
1, setting sleeve pipe hanger.By hydraulic setting mode, casing hanger is set, after setting end, trip out top
Drilling tool 1；
2, flow string tieback are entered under.Under enter flow string and with casing hanger 2 tieback, complete completion practice.Carry out
During production of hydrocarbons, gas stream enters main borehole annular space 15 through capillary tube 4 and Microdrilling annular space 14, passes through and is arranged on capillary
On pipe pipe nipple, ball-and-seat 9 enters in completion tubular column, and flow to ground through flow string.
Claims (3)
1. tree well be drilled well and a method for increasing, it is characterized in that: it includes following step:
(1) overall plan design: integrated well body structure, brill completion program and the acid stimulation of tree well is designed；
(2) the drilling through of tree well: utilize drilling tool by with the casing hanger of tie-back sleeve and casing hanger bottom institute
The completion tubular column connected is lowered into precalculated position；Inject acidifying solution by ground turn on pump and make tubing string supercharging, at the work of inside and outside differential pressure
The end being arranged in capillary tube pipe nipple under with is provided with the protruding around property capillary tube of flow jet flow drill, utilizes high-pressure water jet
Broken rock also combines the acidifying solution acid etching to formation rock, reaches to drill through the purpose of branch's Microdrilling；
(3) completion of tree well, setting sleeve pipe hanger, drilling tool is extracted from the top tie-back sleeve of casing hanger,
And trip out drilling tool；Under enter flow string and with casing hanger tieback, complete completion practice；During production, gas stream is through capillary
Pipe enters main borehole annular space with the annular space of Microdrilling, passes through and is arranged on ball-and-seat entrance completion tubular column on capillary tube pipe nipple
In, and it flow to ground through flow string.
A kind of tree well the most according to claim 1 be drilled well and method for increasing, it is characterized in that: described (2)
Middle operating tool string structure includes from top to bottom: drilling tool 1, the casing hanger 2 of band tie-back sleeve, tail pipe 5, capillary tube pipe nipple 3, hydraulic pressure
Casing anchor 6, valve pipe shoe 7；The quantity of capillary tube pipe nipple 3, depth of setting and the tail pipe between them 5 quantity are set by overall plan
Meter determines；If any the demand of separate zone production, packer can be added between the payzone of different series of strata and do so that interlayer is reduced or eliminated
Disturb.
A kind of tree well the most according to claim 1 be drilled well and method for increasing, it is characterized in that: described (2)
Middle capillary tube pipe nipple 3 internally installed have 3～5 a length of 8～11 meters long around property capillary tube 4；The end of every capillary 4
Flow jet flow drill 8 is installed；Capillary tube pipe nipple 3 is machined with the oblique hole 12 of 3～5 axial distribution, the axis in this hole and pipe nipple
Axis is 40 ° of angles；Each oblique hole 12 is provided with a capillary 4, with sealing shroud 10 between capillary tube 4 and oblique hole 12
Seal；The end of sealing shroud 10 is provided with blocking 11, prevents the surge pressure during lower operating tool string from making capillary tube 4 carry
Before stretch out；In work progress, when in tubing string, pressure reaches preset value, blocking 11 will be pumped out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610310324.4A CN105952378A (en) | 2016-05-12 | 2016-05-12 | Tree-shape structure well drilling and completion and yield increasing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610310324.4A CN105952378A (en) | 2016-05-12 | 2016-05-12 | Tree-shape structure well drilling and completion and yield increasing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105952378A true CN105952378A (en) | 2016-09-21 |
Family
ID=56911330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610310324.4A Pending CN105952378A (en) | 2016-05-12 | 2016-05-12 | Tree-shape structure well drilling and completion and yield increasing method |
Country Status (1)
| Country | Link |
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| CN (1) | CN105952378A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106246104A (en) * | 2016-09-27 | 2016-12-21 | 中国石油集团川庆钻探工程有限公司 | A kind of two boiled water horizontal well construction methods |
| CN106917618A (en) * | 2017-02-18 | 2017-07-04 | 中国石油大学胜利学院 | A kind of miniature multilateral well volume increase deflecting sub and method |
| CN108049857A (en) * | 2017-11-22 | 2018-05-18 | 中国石油集团长城钻探工程有限公司 | A kind of completion volume increase tubing string and its application method |
| CN110359844A (en) * | 2018-04-10 | 2019-10-22 | 中国石油天然气股份有限公司 | A kind of casing programme acquisition methods |
| CN110748293A (en) * | 2018-07-24 | 2020-02-04 | 中国石油化工股份有限公司 | Multilateral well open hole completion method |
| CN110863800A (en) * | 2018-08-27 | 2020-03-06 | 中国石油化工股份有限公司 | Single-well closed development method for hot dry rock |
| CN112160766A (en) * | 2020-11-05 | 2021-01-01 | 重庆大学 | Mechanical-chemical corrosion-hydraulic cutting combined tunneling construction equipment and working method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106246104A (en) * | 2016-09-27 | 2016-12-21 | 中国石油集团川庆钻探工程有限公司 | A kind of two boiled water horizontal well construction methods |
| CN106246104B (en) * | 2016-09-27 | 2018-09-07 | 中国石油集团川庆钻探工程有限公司 | A kind of two boiling water horizontal well construction methods |
| CN106917618A (en) * | 2017-02-18 | 2017-07-04 | 中国石油大学胜利学院 | A kind of miniature multilateral well volume increase deflecting sub and method |
| CN106917618B (en) * | 2017-02-18 | 2023-01-03 | 山东石油化工学院 | Micro multi-branch well yield-increasing steering nipple and method |
| CN108049857A (en) * | 2017-11-22 | 2018-05-18 | 中国石油集团长城钻探工程有限公司 | A kind of completion volume increase tubing string and its application method |
| CN110359844A (en) * | 2018-04-10 | 2019-10-22 | 中国石油天然气股份有限公司 | A kind of casing programme acquisition methods |
| CN110748293A (en) * | 2018-07-24 | 2020-02-04 | 中国石油化工股份有限公司 | Multilateral well open hole completion method |
| CN110863800A (en) * | 2018-08-27 | 2020-03-06 | 中国石油化工股份有限公司 | Single-well closed development method for hot dry rock |
| CN112160766A (en) * | 2020-11-05 | 2021-01-01 | 重庆大学 | Mechanical-chemical corrosion-hydraulic cutting combined tunneling construction equipment and working method |
| CN112160766B (en) * | 2020-11-05 | 2022-05-27 | 重庆大学 | Mechanical-chemical corrosion-hydraulic cutting combined tunneling construction equipment and working method |
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Inventor after: Zhu Xiaohua Inventor after: Chen Mingyang Inventor after: Tong Hua Inventor before: Zhu Xiaohua Inventor before: Shi Changshuai Inventor before: Tong Hua |
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Application publication date: 20160921 |