CN105945517A - Continuous velocity tubular column and manufacturing method thereof - Google Patents
Continuous velocity tubular column and manufacturing method thereof Download PDFInfo
- Publication number
- CN105945517A CN105945517A CN201610313230.2A CN201610313230A CN105945517A CN 105945517 A CN105945517 A CN 105945517A CN 201610313230 A CN201610313230 A CN 201610313230A CN 105945517 A CN105945517 A CN 105945517A
- Authority
- CN
- China
- Prior art keywords
- tubing string
- continuous velocity
- steel band
- welding
- continuous
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/20—Flexible or articulated drilling pipes, e.g. flexible or articulated rods, pipes or cables
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention discloses a continuous velocity tubular column and a manufacturing method thereof. Steel of the continuous velocity tubular column comprises the chemical components of, by weight percentage, 0.07-0.16 of C, 0.2-0.45 of Si, 0.5-0.85 of Mn, 0-0.02 of P, 0-0.002 of S, 0.52-0.9 of Cr, 0.1-0.4 of Cu, 0-0.22 of Mo, 0-0.3 of Ni, 0-0.05 of V, 0.02-0.04 of Nb, and the balance Fe. After the raw materials are subjected to longitudinal shearing, butt joint, forming welding and heat treatment, the continuous velocity tubular column which is larger than or equal to 61 m in single length, can reach the highest being thousands of meters, and is free of a threaded connection connector in the middle is obtained. The continuous velocity tubular column is larger than or equal to 359 MPa in yield strength, larger than or equal to 455 MPa in tensile strength, 248 HV0.5 in greatest hardness and is suitable for long-time service in an oil and gas well, and has good corrosion resistance.
Description
Technical field:
The present invention relates to petroleum gas tubing technical field, be specifically related to a kind of continuous velocity pipe
Post and manufacture method thereof.
Background technology:
The fine and close gas fields such as long celebrating Su Lige are after gas well is gone into operation, along with the continuity of production time, ground
Layer energy is gradually lowered, and gas-bearing formation pressure declines, and gas well fluid-carrying capability gradually weakens, and pit shaft starts
Hydrops occur, gas production declines, and can cause gas well stop-spraying time serious, and stable yields is protected for pressure huge.
Well head is hung on by special hanger, by closing annular space in entering oil pipe under speed tubing string
Or tubing string end, make gas internal from speed tubing string or annular space pass through, with the speedup that reaches to throttle,
Improve gas well drainage capacity, be the effective way solving gas well plug-ging problem.Previously used speed
Degree tubing string is conventional oil pipe, joint length about 10 meters, and many employing nipples are connected to institute
Need length.Conventional speeds tubing string uses common low carbon seamless steel pipe, carries out upset thickening at pipeline section
And heat treatment post-treatment goes out screw thread, screw thread is connected with box cupling, relies on step surface between metal after tightening
Closely cooperate and realize the sealing of oil pipe and be connected to Len req.
Use conventional speeds tubing string to carry out water pumping gas production operation to have the disadvantage that: one, joint is more,
Difficult quality guarantee, safety is poor.As a example by application in the well of degree of depth 3000m, adopt
Connecting with nipple, can produce more than 300 nipple, any one joint quality is only
Closing all to make tubing string come off, and causes down-hole accident, causes heavy losses, and speed tubing string row
Speed tubing string need to be placed in well by hydromining gas operation for a long time, stands the erosion of corrosive medium, often
Rule speed tubing string is ordinary low-carbon steel material, and corrosive nature is general, it is hard to carry out long-term clothes continuously
Labour, especially joint easily produce crevice corrosion (crevice corrosion be when metal parts it
Between form micro gap in media as well, owing to corrosive medium diffusion uneven causes inside gap
Form concentration difference with outside, constitute concentration potential poor, make metal generation local corrosion), pole
Easily cause speed tubing string and reveal inefficacy.Two, working performance is relatively low.The single length of conventional speeds tubing string
Spend limited, it is necessary to entering under after spreading, operating personnel is many, and the engineering time is longer.
A kind of it is suitable for the continuous velocity tubing string at down-hole long service accordingly, it would be desirable to research and develop.
The present invention uses corrosion resistant material to make the joint length continuous velocity tubing string up to thousands of meters, installs
Fast, and it is suitable for long service in Oil/gas Well, carries out water pumping gas production operation.
Summary of the invention:
In order to overcome above-mentioned technical problem, it is an object of the invention to provide one and be suitable in down-hole
The continuous velocity tubing string of long service, the continuous velocity tubing string excellent corrosion-proof performance of the present invention, list
Root length degree is up to thousands of rice, and working performance is high；Present invention also offers a kind of continuous velocity tubing string
Manufacture method.
In order to solve above-mentioned technical problem, the present invention adopts the technical scheme that: a kind of speed continuously
Degree tubing string, according to percentage by weight, the steel chemical composition of this tubing string is: C:0.07～0.16,
Si:0.2～0.45, Mn:0.5～0.85, P :≤0.02, S :≤0.002, Cr:0.52～
0.9, Cu:0.1～0.4, Mo :≤0.22, Ni :≤0.3, V :≤0.05, Nb:0.02～
0.04, surplus is ferrum.
Above-mentioned continuous velocity tubing string external diameter is 25.4～88.9mm, and wall thickness is 1.9～7.6mm, bends
Take intensity >=359MPa, tensile strength >=455MPa, highest hardness 248HV0.5。
Above-mentioned continuous velocity tubing string joint length >=61m, reaches as high as thousands of rice, and centre does not has
Thread connecting joint.
The manufacture method manufacturing above-mentioned continuous velocity tubing string is: concrete manufacturing step is as follows:
Step 1: chemical composition is carried out melting, is forged into slab；
Step 2: slab is rolled, concrete technology is as follows:
Use TMCP technique, carry out during by the heating of plate blank of mentioned component to 980～1250 DEG C
Roughing, carries out finish rolling at 690 DEG C～900 DEG C；Coiling temperature 380～600 DEG C, be eventually fabricated thickness
The coil of strip of degree 1.9～7.6mm；
Step 3: coil of strip slitting is become steel band, it is achieved the spreading of steel band
Adjacent steel band end is cut off by certain angle, is processed into conjunction according to thickness of strips
The bevel for welding of reason, uses Plasma Welding or argon arc welding, agitating friction weldering and other welding sides
Steel band is welded by method.Near cleaning butt weld after welding slag, by butt weld and heat affecting
District be heated to certain temperature after butt welded seam roll after cool down, thus realize connecing of steel band
Long；
Step 4: the steel band after spreading is made continuous velocity tubing string
By the steel band after spreading by after row-roll forming process, ratio-frequency welding is used to weld.Butt welded seam
Carry out 880 DEG C～960 DEG C of heat treatments, subsequently full body is carried out 600 DEG C～770 DEG C of destressings
Process.
Step 5: continuous velocity tubing string is carried out corrosion resisting property detection.
The steel performance of coil of strip in above-mentioned steps 2: yield strength 300～650MPa, tension is strong
Degree >=420MPa, elongation percentage is more than 20%, highest hardness 240HV0.5, grain size is at ASTM
More than E112NO.8 level, banded structure≤2 grade.
The method that in above-mentioned steps 3, steel band welding uses is Plasma Welding.
Beneficial effects of the present invention:
1, on the premise of meeting mechanical properties of tubular goods, by low-carbon (LC) Cu-Mo-Cr-Ni alloy
Set member designs, and innovates whole process ultra-clean degree smelting process, controls to set about improve from steel
The corrosion resistance of tubing self.Meanwhile, docked by steel band and postwelding rolls Technology for Heating Processing,
Steel band banjo fixing butt jointing to good quality, it is achieved the spreading of steel band.And by ratio-frequency welding (HFW)
And special subsequent heat treatment technique, produce excellent corrosion-proof performance, joint length up to thousands of
The continuous velocity tubing string product of rice.
2, the continuous velocity tubing string of the present invention does not has a thread connecting joint, joint length >=61m,
Reach as high as thousands of rice, solve conventional speeds tubing string nipple more, and nipple is easy
Produce the difficult problem that crevice corrosion causes tubing string to come off；When carrying out water pumping gas production operation, it is not necessary to connect
Single, the continuous direct G.I.H of pipe implement can be passed through, working performance is carried greatly
High.
3, by continuous velocity tubing string of the present invention is carried out corrosion resisting property detection, the company of the present invention
Continuous speed tubing string compares the corrosion resisting property with excellence with conventional low-carbon (LC) seamless steel pipe speed tubing string,
More disclosure satisfy that the requirement of long service in well.
Detailed description of the invention:
1) roll bending of following composition is devised:
The steel rolling using mentioned component design is become 1120 × 3.18mm specification, weight 20t,
It is about the coil of strip of 680m.
This steel main performance: yield strength 465MPa, tensile strength 540MPa, extend
Rate 27%, hardness 218HV0.5.Grain size is at ASTM E112NO.10 level, banded structure
1.0 level.
2) this coil of strip slitting is become 9 steel bands of width 120.2mm.Steel band is butted into always
The steel band of long 6120 meters.Utilize row-roll forming process for the steel pipe of Φ 38.1 × 3.18mm specification, warp
Weld seam heat treatment, full body destressing obtain the long continuous velocity tubing string of 3500 meters of a dish after processing
Product.
The main performance of this continuous pipe: yield strength is 520MPa, tensile strength is 600MPa,
Highest hardness 227HV0.5。
Test according to NACE's NACE standard TM0284-2003,
This test uses High Purity Nitrogen deoxygenation, and etchant solution is 0.5% acetic acid+5% that hydrogen sulfide is saturated
NaCl mixed solution, etchant solution distilled water and chemically pure reagent preparation.Liquor capacity and
Area of Sample ratio is more than 3mL/cm2, solution temperature is maintained at 25 ± 3 DEG C.Through 96 hours
After test, sample is carried out, observes, do not have crackle and bubbling to produce.
According to NACE's standard NACE TM 0177-1996 " metal material
Containing H2Resisting sulfide stress corrosion cracking method for testing performance in S environment " (it is equivalent to China
" metal is anti-specific form ring in hydrogen-sulfide environmental for people's republic standard GB/T 4157-2006
Border cracking laboratory test ") to test, load mode uses static stretch method, to sample
Applying the tensile stress that numerical value is 535MPa yield pressure, etchant solution is regulation in standard
Solution A (hydrogen sulfide saturated 5%NaCl+0.5% glacial acetic acid aqueous solution).Through 720 hours
Stress etching experiment, sample is unbroken.
In certain oil field gas well, carry out water pumping gas production operation, trip out after being on active service 3 years continuously and examine
Survey: loss of strength is less than 7%；Use laser co-focusing equipment that wall thickness corrosion condition is carried out
Measure, measurement result extrapolate, the maximum in this dish continuous velocity tubing string gas well under arms
Corrosion rate is 0.114mm/a, still meets the mechanical property requirements continuing to be on active service.
Above content is that to combine concrete preferred implementation made for the present invention further in detail
Describe in detail bright, it is impossible to assert that the detailed description of the invention of the present invention is only limitted to this, for belonging to the present invention
For the those of ordinary skill of technical field, without departing from the inventive concept of the premise, also may be used
To make some simple deduction or replace, the present invention all should be considered as belonging to by the power submitted to
Profit claim determines scope of patent protection.
Claims (5)
1. a continuous velocity tubing string, it is characterised in that: according to percentage by weight, described company
The steel chemical composition of continuous speed tubing string is: C:0.07～0.16, Si:0.2～0.45, Mn:
0.5～0.85, P :≤0.02, S :≤0.002, Cr:0.52～0.9, Cu:0.1～0.4,
Mo :≤0.22, Ni :≤0.3, V :≤0.05, Nb:0.02～0.04, surplus is ferrum.
2. continuous velocity tubing string as claimed in claim 1, it is characterised in that: described continuously
The external diameter of speed tubing string is 25.4～88.9mm, and wall thickness is 1.9～7.6mm, yield strength
>=359MPa, tensile strength >=455MPa, highest hardness 248HV0.5。
3. continuous velocity tubing string as claimed in claim 1, it is characterised in that: described continuously
Joint length >=the 61m of speed tubing string, reaches as high as thousands of rice, and centre does not has threaded connecing
Head.
4. the manufacture method of continuous velocity tubing string as claimed in claim 1, it is characterised in that:
Concrete manufacturing step is as follows:
Step 1: chemical composition is carried out melting, is forged into slab；
Step 2: slab is rolled, concrete technology is as follows:
Use TMCP technique, carry out during by the heating of plate blank of mentioned component to 980～1250 DEG C
Roughing, carries out finish rolling, coiling temperature 380 DEG C～600 DEG C at 690 DEG C～900 DEG C, is eventually fabricated
The coil of strip of thickness 1.9～7.6mm；
Step 3: coil of strip slitting is become steel band, it is achieved the spreading of steel band
Adjacent steel band end is cut off by certain angle, is processed into conjunction according to thickness of strips
The bevel for welding of reason, uses Plasma Welding or argon arc welding, agitating friction weldering and other welding sides
Steel band is welded by method.Near cleaning butt weld after welding slag, by butt weld and heat affecting
District be heated to certain temperature after butt welded seam roll after cool down, thus realize connecing of steel band
Long；
Step 4: the steel band after spreading is made continuous velocity tubing string
By the steel band after spreading by after row-roll forming process, ratio-frequency welding is used to weld, butt welded seam
Carry out 880 DEG C～960 DEG C of heat treatments, subsequently full body is carried out 600 DEG C～770 DEG C of destressings
Process；
Step 5: continuous velocity tubing string is carried out corrosion resisting property detection.
5. the manufacture method of continuous velocity tubing string as claimed in claim 4, it is characterised in that:
The steel performance of coil of strip in described step 2: yield strength 300～650MPa, tensile strength
>=420MPa, elongation percentage is more than 20%, highest hardness 240HV0.5, grain size is at ASTM E112
More than NO.8 level, banded structure≤2 grade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610313230.2A CN105945517B (en) | 2016-05-12 | 2016-05-12 | A kind of continuous velocity tubing string and its manufacture method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610313230.2A CN105945517B (en) | 2016-05-12 | 2016-05-12 | A kind of continuous velocity tubing string and its manufacture method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105945517A true CN105945517A (en) | 2016-09-21 |
| CN105945517B CN105945517B (en) | 2018-04-27 |
Family
ID=56912350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610313230.2A Active CN105945517B (en) | 2016-05-12 | 2016-05-12 | A kind of continuous velocity tubing string and its manufacture method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105945517B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115679199A (en) * | 2021-07-30 | 2023-02-03 | 宝山钢铁股份有限公司 | Steel for continuous speed pipe column, hot-rolled steel strip, steel pipe and manufacturing method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101898295A (en) * | 2010-08-12 | 2010-12-01 | 中国石油天然气集团公司 | Manufacturing method of high-strength and high-plasticity continuous tube |
| EP2383065A2 (en) * | 2010-04-30 | 2011-11-02 | DFI Corporation | Dual seam electric resistance welded tubes |
| CN202300215U (en) * | 2011-07-22 | 2012-07-04 | 宝鸡石油钢管有限责任公司 | Large-specification low-carbon micro-alloy steel continuous oil pipe |
| CN104651591A (en) * | 2014-11-21 | 2015-05-27 | 宝鸡石油钢管有限责任公司 | High-strength low-hardness continuous oil pipe and preparation method thereof |
| CN105177453A (en) * | 2015-09-25 | 2015-12-23 | 宝鸡石油钢管有限责任公司 | High-strength and high-performance coiled tubing and manufacturing method thereof |
| CN105458633A (en) * | 2016-01-06 | 2016-04-06 | 河北华通线缆集团股份有限公司 | Manufacturing method of low-carbon steel coiled tubing |
-
2016
- 2016-05-12 CN CN201610313230.2A patent/CN105945517B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2383065A2 (en) * | 2010-04-30 | 2011-11-02 | DFI Corporation | Dual seam electric resistance welded tubes |
| CN101898295A (en) * | 2010-08-12 | 2010-12-01 | 中国石油天然气集团公司 | Manufacturing method of high-strength and high-plasticity continuous tube |
| CN202300215U (en) * | 2011-07-22 | 2012-07-04 | 宝鸡石油钢管有限责任公司 | Large-specification low-carbon micro-alloy steel continuous oil pipe |
| CN104651591A (en) * | 2014-11-21 | 2015-05-27 | 宝鸡石油钢管有限责任公司 | High-strength low-hardness continuous oil pipe and preparation method thereof |
| CN105177453A (en) * | 2015-09-25 | 2015-12-23 | 宝鸡石油钢管有限责任公司 | High-strength and high-performance coiled tubing and manufacturing method thereof |
| CN105458633A (en) * | 2016-01-06 | 2016-04-06 | 河北华通线缆集团股份有限公司 | Manufacturing method of low-carbon steel coiled tubing |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115679199A (en) * | 2021-07-30 | 2023-02-03 | 宝山钢铁股份有限公司 | Steel for continuous speed pipe column, hot-rolled steel strip, steel pipe and manufacturing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105945517B (en) | 2018-04-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7896984B2 (en) | Method for manufacturing seamless steel pipe for line pipe | |
| CN110181230B (en) | Bimetal metallurgy composite pipe and preparation method thereof | |
| CA2376633C (en) | Low-alloy carbon steel for the manufacture of pipes for the exploration and the production of oil and/or gas having an improved corrosion resistance, a process for the manufacture of seamless pipes, and the seamless pipes obtained therefrom | |
| CN102345077B (en) | Large-expansion-ratio expansion pipe steel with high product of strength and elongation and preparation method thereof | |
| CN104831180B (en) | A kind of deep-sea ocean flexible pipe armor steel and preparation method thereof | |
| CN103994284B (en) | A kind of austenitic stainless steel is continuously managed and its manufacturing method | |
| CN107619994A (en) | A kind of anti-CO2/H2S and sulfate reducing bacteria corrosion seamless line pipe and its manufacture method | |
| CN104089109B (en) | A kind of 625MPa grades of UOE welded tube and its manufacture method | |
| CN110106439A (en) | Marine riser X65 hot rolled steel plate and preparation method thereof | |
| CN104404299A (en) | Titanium alloy continuous oil pipe and manufacturing method thereof | |
| WO2016041491A1 (en) | 550 mpa high temperature-resistant pipeline steel and manufacturing method thereof | |
| AU2019329105A1 (en) | Duplex Stainless Steel Seamless Pipe and Method for Manufacturing Same | |
| CN106191671B (en) | High strength sulfur resisting hydrogen-type corrosion seamless line pipe and preparation method thereof | |
| JPWO2015151468A1 (en) | Steel material for high deformability line pipe excellent in strain aging resistance and HIC resistance, manufacturing method thereof, and welded steel pipe | |
| CN110016614B (en) | X80 hot-rolled steel plate for deep-sea drilling riser and preparation method thereof | |
| CN105945517B (en) | A kind of continuous velocity tubing string and its manufacture method | |
| CN111411307B (en) | Antibacterial corrosion-resistant coiled tubing for well completion and manufacturing method thereof | |
| JP5211708B2 (en) | Stainless steel pipe for oil well with excellent pipe expandability and method for producing the same | |
| CN104894432A (en) | 110 ksi-level titanium alloy oil pipe and preparation method thereof | |
| CN104018030B (en) | High-strength high-ductility seawater corrosion resistance alloy, Preparation Method And The Use | |
| CN106086645A (en) | Hydrogen sulfide corrosion resistant tubing and casing and manufacture method thereof | |
| CN102296244A (en) | Economic corrosion-resistant wire rod used for sucker rod and manufacturing method thereof | |
| CN105840919A (en) | Continuous pipe resistant to H2S corrosion and manufacturing method thereof | |
| JP4720344B2 (en) | Steel pipe, pipeline using the steel pipe | |
| CN104651591B (en) | Preparation method of high-strength low-hardness continuous oil pipe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20181016 Address after: 100007 Dongzhimen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee after: Baoji Petroleum Steel Pipe Co., Ltd. Patentee after: China Petroleum and Natural Gas Group Co., Ltd. Address before: 721008 10 Jiang Tan Road, Weibin District, Baoji, Shaanxi. Patentee before: Baoji Petroleum Steel Pipe Co., Ltd. |
|
| TR01 | Transfer of patent right |