CN108756808A - Well cementation self-oscillation float collar - Google Patents
Well cementation self-oscillation float collar Download PDFInfo
- Publication number
- CN108756808A CN108756808A CN201810455787.9A CN201810455787A CN108756808A CN 108756808 A CN108756808 A CN 108756808A CN 201810455787 A CN201810455787 A CN 201810455787A CN 108756808 A CN108756808 A CN 108756808A
- Authority
- CN
- China
- Prior art keywords
- pipe nipple
- shell
- overhead gage
- upper shell
- concussion
- 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.)
- Pending
Links
- 210000002445 nipple Anatomy 0.000 claims abstract description 40
- 230000009514 concussion Effects 0.000 claims abstract description 32
- 238000007789 sealing Methods 0.000 claims description 3
- 239000011083 cement mortar Substances 0.000 abstract description 26
- 238000005056 compaction Methods 0.000 abstract description 4
- 239000012530 fluid Substances 0.000 description 8
- 238000005553 drilling Methods 0.000 description 7
- 239000004568 cement Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000004520 agglutination Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000007704 transition Effects 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- 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
- E21B28/00—Vibration generating arrangements for boreholes or wells, e.g. for stimulating production
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)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
The present invention relates to the technical fields of float collar, it is a kind of well cementation self-oscillation float collar, it includes upper shell, lower shell, the lower end of lower shell is connected with top guide, the one-way valve structures that can only be opened from top to bottom are provided in upper shell, turbulence cavity overhead gage, the first concussion pipe nipple are disposed in upper shell below one-way valve structures from top to bottom, the second concussion pipe nipple is provided in lower shell, annular spread has the first protrusion, the second protrusion respectively on the inner wall of the first concussion pipe nipple and the second concussion pipe nipple.Structure of the invention is reasonable and compact, pass through the self-oscillation chamber that setting is constituted by swinging chamber overhead gage, the first concussion pipe nipple, the second concussion pipe nipple in upper shell and lower shell, low frequency self-oscillation occurs for the cement mortar that can flow through this region, to drive entire bunch tube in well that low-frequency vibration occurs, the compaction rate that can effectively improve replacement efficiency and later stage cement mortar, so as to effectively improve cementing quality.
Description
Technical field
The present invention relates to the technical fields of float collar, are a kind of well cementation self-oscillation float collars.
Background technology
The well of the special operation conditions such as gas well, small annular clearance, if with conventional well cementation float collar, it is easy to by drilling fluid displacing
The influence of efficiency and cement slurry property fluctuation generates well cementation defect in well cementing process, once there is critical defect, it will be very big
Ground influence oil well follow-up work development, therefore in recent years, improve gas well cementing matter quantifier elimination with apply it is upper, can improve
Annular space drilling fluid displacing efficiency and the special cementing unit for improving cement slurry property are concerned.
Invention content
The present invention provides a kind of well cementation self-oscillation float collars, overcome the deficiency of the above-mentioned prior art, can be effective
Conventional cementing float collar is solved when in face of the well cementing operation of special operation condition, it is easy to because of drilling fluid displacing efficiency and cement mortar
Can the reason of cause cement the well defect the problem of.
The technical scheme is that realized by following measures：A kind of well cementation self-oscillation float collar includes upper cylinder
Body, lower shell, the lower end of upper shell are fixedly connected with the upper end of lower shell, and the lower end of lower shell is connected with top guide, top guide
For hemispherical shell, at least provided with a cycle through-hole on top guide, be provided in upper shell to open from top to bottom
One-way valve structures, be disposed with turbulence cavity overhead gage, the first concussion from top to bottom in the upper shell below one-way valve structures
Pipe nipple, is provided with the second concussion pipe nipple in lower shell, turbulence cavity overhead gage, the first concussion pipe nipple, the second concussion pipe nipple from up to
Under be fixedly connected sequentially, first is provided in the middle part of turbulence cavity overhead gage and crosses recirculation hole, is provided with restriction on the inner wall of upper shell
The first step of turbulence cavity overhead gage upper surface is provided on the inner wall of lower shell and limits the of the second turbulence cavity pipe nipple lower face
Two steps, annular spread has the first protrusion, the second protrusion respectively on the inner wall of the first concussion pipe nipple and the second concussion pipe nipple.
Here is the further optimization and/or improvements to foregoing invention technical solution：
Above-mentioned one-way valve structures include overhead gage, lower baffle plate, spool, and overhead gage is threaded in upper shell respectively with lower baffle plate
It is provided with second on inner wall, in the middle part of overhead gage and crosses recirculation hole, spool is provided between overhead gage and lower baffle plate, spool is by valve
Head is constituted with valve rod, and the upper surface of valve head is in canopy shape and can seal first and crosses recirculation hole, and valve rod is connected under valve head vertically
Mounting hole corresponding with valve rod is provided on end face, on lower baffle plate, the lower part of valve rod is arranged in mounting hole, in the outer of valve rod
Side is set with spring, the upper end top pressure of spring on the lower face of valve head, the lower end top pressure of spring on the upper surface of lower baffle plate,
On the lower baffle plate of spring outwards recirculation hole is crossed at least provided with a third.
It is provided with sealing ring between above-mentioned valve rod and mounting hole.
Above-mentioned first protrusion and the second protrusion are all in low inside and high outside skewed, and the first both sides up and down for crossing recirculation hole are all set
It is equipped with chamfering.
It is provided with external screw thread on outer wall at above-mentioned upper shell upper port, to be threadedly coupled between upper shell and lower shell,
Turbulence cavity overhead gage, the first concussion pipe nipple, the second concussion pipe nipple are threadedly coupled successively from top to bottom.
Structure of the invention is reasonable and compact, by being arranged in upper shell and lower shell by swinging chamber overhead gage, the first concussion
Low frequency self-oscillation occurs for the self-oscillation chamber that pipe nipple, the second concussion pipe nipple are constituted, the cement mortar that can flow through this region, from
And drive entire bunch tube in well that low-frequency vibration occurs, the compaction rate of replacement efficiency and later stage cement mortar is can effectively improve,
So as to effectively improve cementing quality.
Description of the drawings
Attached drawing 1 is main view half section schematic of the preferred embodiment when float shoe fuse is closed.
Attached drawing 2 is main view half section schematic of the preferred embodiment when float shoe fuse is opened.
Coding in attached drawing is respectively：1 is upper shell, and 2 be lower shell, and 3 be top guide, and 4 be cycle through-hole, and 5 be turbulence cavity
Overhead gage, 6 be the first concussion pipe nipple, and 7 be the second concussion pipe nipple, and 8 cross recirculation hole for first, and 9 be first step, and 10 be second
Rank, 11 be the first protrusion, and 12 be the second protrusion, and 13 be overhead gage, and 14 be lower baffle plate, and 15 cross recirculation hole for second, and 16 be valve head,
17 be valve rod, and 18 be mounting hole, and 19 be spring, and 20 cross recirculation hole for third.
Specific implementation mode
The present invention is not limited by following embodiments, can be determined according to the technique and scheme of the present invention with actual conditions specific
Embodiment.
In the present invention, for ease of description, the description of the relative position relation of each component is according to Figure of description 1
Butut mode be described, such as：The position relationship of upper and lower, left and right etc. is the Butut direction according to Figure of description 1
Come what is determined.
With reference to embodiment and attached drawing, the invention will be further described：
As shown in attached drawing 1,2, which includes upper shell 1, lower shell 2, the lower end of upper shell 1 and lower cylinder
The upper end of body 2 is fixedly connected, and the lower end of lower shell 2 is connected with top guide 3, and top guide 3 is hemispherical shell, top guide 3 up to
Few setting is provided with the one-way valve structures that can only be opened from top to bottom, check valve knot there are one through-hole 4 is recycled in upper shell 1
Turbulence cavity overhead gage 5, first is disposed in upper shell 1 below structure from top to bottom and shakes pipe nipple 6, is arranged in lower shell 2
There is the second concussion pipe nipple 7, the concussion concussion of pipe nipple 6, second pipe nipple 7 of turbulence cavity overhead gage 5, first is fixed successively from top to bottom to be connected
It connects, the middle part of turbulence cavity overhead gage 5 is provided with first and crosses recirculation hole 8, is provided with to limit on the inner wall of upper shell 1 and be kept off on turbulence cavity
The first step 9 of 5 upper surface of plate is provided with the second step for limiting the second turbulence cavity pipe nipple lower face on the inner wall of lower shell 2
10, annular spread has the first protrusion 11, the second protrusion 12 respectively on the inner wall of the first concussion concussion pipe nipple 7 of pipe nipple 6 and second.
In actual use, cement mortar from top to bottom enters from one-way valve structures in upper shell 1, then passes through
Pipe nipple 6, second is shaken by turbulence cavity overhead gage 5, first and shakes the self-oscillation chamber that pipe nipple 7 is constituted, finally from following on top guide 3
It is flowed out at ring through-hole 4, cement mortar is when by self-oscillation chamber, due to the effect of the first protrusion 11 and the second protrusion 12, cement
Low frequency self-oscillation can occur for slurry, to drive entire bunch tube in well that low-frequency vibration occurs, can effectively improve replacement efficiency
With the compaction rate of later stage cement mortar, so as to effectively improve cementing quality.
Above-mentioned well cementation can be made further optimization and/or improvements with self-oscillation float collar according to actual needs：
As shown in attached drawing 1,2, one-way valve structures include overhead gage 13, lower baffle plate 14, spool, and overhead gage 13 is distinguished with lower baffle plate 14
It is threaded on the inner wall of upper shell 1, the middle part of overhead gage 13 is provided with second and crosses recirculation hole 15, in overhead gage 13 and lower block
Spool is provided between plate 14, spool is made of valve head 16 and valve rod 17, and the upper surface of valve head 16 is in canopy shape and can seal the
One crosses recirculation hole 8, and valve rod 17 is connected on the lower face of valve head 16, is provided on lower baffle plate 14 corresponding with valve rod 17 vertically
The lower part of mounting hole 18, valve rod 17 is arranged in mounting hole 18, and spring 19, the upper end of spring 19 are housed in the outer sheath of valve rod 17
Top pressure is on the lower face of valve head 16, and the lower end top pressure of spring 19 is on the upper surface of lower baffle plate 14, under 19 outside of spring
On baffle 14 recirculation hole 20 is crossed at least provided with a third.
The form of one-way valve structures has very much, and the present embodiment is one such structure type, and cement mortar pushes valve head
16 move downward simultaneously compressed spring 19 with valve rod 17, are opened to make second to cross recirculation hole 15 so that cement mortar smoothly enters
Into upper shell 1, second crosses recirculation hole 15 when opening, and spring 19 is constantly in confined state, enters in upper shell 1
Cement mortar, which flows through the third on lower baffle plate 14, crosses recirculation hole 20, and finally crossing recirculation hole 8 by first enters self-oscillation chamber, if
Cement mortar reverse flow from bottom to up, under the impact force of 19 elastic force of spring and cement mortar, umbraculiferous valve head 16 can be again
It closes second and crosses recirculation hole 15, prevent cement mortar from flowing back, and then realize the effect of one-way flow, it is ensured that well cementation is safe and solid
Well quality, its structure type of this one-way valve structures is simple, stable work in work, has stronger practicability.
According to actual needs, it is provided with sealing ring between valve rod 17 and mounting hole 18.The close of the present invention can be improved in this way
Closing property makes cement mortar according to set route proper flow, it is ensured that well cementing process is smoothed out.
As shown in attached drawing 1,2, the first protrusion 11 and the second protrusion 12 are all in low inside and high outside skewed, the first mistake recirculation hole
8 both sides up and down are both provided with chamfering.Design can be more conducive to that cement mortar is made to generate low frequency when flowing through turbulence cavity certainly in this way
It impulses and swings effect.
As shown in attached drawing 1,2, be provided with external screw thread on the outer wall at 1 upper port of upper shell, upper shell 1 and lower shell 2 it
Between for be threadedly coupled, turbulence cavity overhead gage 5, first shake pipe nipple 6, second shake pipe nipple 7 be threadedly coupled successively from top to bottom.
Threaded connection is very common type of attachment, can greatly easy to disassemble and installation process.
The above technical characteristic constitutes highly preferred embodiment of the present invention, is imitated with stronger adaptability and best implementation
Fruit can increase and decrease non-essential technical characteristic, to meet the needs of different situations according to actual needs.
The use process of preferred embodiment：
Upper shell 1 is connected to the end of bunch tube surely, when using huge discharge replace cement mortar when, cement mortar push valve head 16 with
Valve rod 17 moves downward and compressed spring 19, crosses recirculation hole 15 to open second, cement mortar is made to enter in upper shell 1, and
It enters eventually into self-oscillation chamber, low frequency self-oscillation can occur when flowing through this region for cement mortar, and this low frequency impulses certainly
Swinging can drive the present invention and entire lower part casing string that micro-vibration occurs, and certain vibrations can also be occurred by flowing into the drilling fluid of annular space,
The shear action that shock effect generates can reduce the viscosity and shear force of drilling fluid, improve the elimination efficiency of mud cake, to improve cement
The replacement efficiency of slurry creates condition.
During cement mortar replaces drilling fluid, the drilling fluid being detained on the borehole wall can be effectively reduced or eliminated, hence it is evident that carry
High interface agglutination quality, cement mortar pass through low-frequency vibration, can greatly reduce the gap in cement mortar and bubble, avoid water
Its inside is in cellular to mud after solidification, improves the performance of cement mortar, improves the compaction rate of cement mortar, and now
It is had confirmed by experiment, under low-frequency vibration effect, it is prone to the cement mortar just final set transition time of bottoms stream intrusion
Section shortens nearly one third, and slot, whole device structure are altered conducive to the formation fluid that solidifying pressure is steady, high-pressure reservoir is inhibited to be likely to occur is waited
Simply, easy for installation, cementing quality can be effectively improved.
Claims (6)
1. a kind of well cementation self-oscillation float collar, it is characterised in that including upper shell, lower shell, the lower end of upper shell and lower shell
Upper end be fixedly connected, the lower end of lower shell is connected with top guide, and top guide is hemispherical shell, on top guide at least provided with
One cycle through-hole, is provided with the one-way valve structures that can only be opened from top to bottom in upper shell, upper below one-way valve structures
Turbulence cavity overhead gage, the first concussion pipe nipple are disposed in cylinder from top to bottom, the second concussion pipe nipple is provided in lower shell,
Turbulence cavity overhead gage, the first concussion pipe nipple, the second concussion pipe nipple are fixedly connected sequentially from top to bottom, the middle part of turbulence cavity overhead gage
It is provided with first and crosses recirculation hole, the first step for limiting turbulence cavity overhead gage upper surface, lower cylinder are provided on the inner wall of upper shell
The second step for limiting the second turbulence cavity pipe nipple lower face is provided on the inner wall of body, it is short in the first concussion pipe nipple and the second concussion
Annular spread has the first protrusion, the second protrusion respectively on the inner wall of section.
2. it is according to claim 1 well cementation use self-oscillation float collar, it is characterised in that one-way valve structures include overhead gage, under
Baffle, spool, overhead gage are threaded on the inner wall of upper shell respectively with lower baffle plate, and the second mistake is provided in the middle part of overhead gage
Recirculation hole is provided with spool between overhead gage and lower baffle plate, and spool is made of valve head and valve rod, and the upper surface of valve head is in canopy
It shape and first can be sealed crosses recirculation hole, valve rod is connected on the lower face of valve head, is provided on lower baffle plate opposite with valve rod vertically
The lower part of the mounting hole answered, valve rod is arranged in mounting hole, spring is housed in the outer sheath of valve rod, the upper end top pressure of spring is in valve
Head lower face on, the lower end top pressure of spring on the upper surface of lower baffle plate, on the lower baffle plate of spring outwards at least provided with
One third crosses recirculation hole.
3. well cementation self-oscillation float collar according to claim 2, it is characterised in that be provided between valve rod and mounting hole
Sealing ring.
4. well cementation self-oscillation float collar according to claim 1 or 2 or 3, it is characterised in that the first protrusion and second convex
It is all in low inside and high outside skewed to rise, and the first both sides up and down for crossing recirculation hole are both provided with chamfering.
5. well cementation self-oscillation float collar according to claim 1 or 2 or 3, it is characterised in that at upper shell upper port
External screw thread is provided on outer wall, to be threadedly coupled between upper shell and lower shell, turbulence cavity overhead gage, first shake pipe nipple, the
Two concussion pipe nipples are threadedly coupled successively from top to bottom.
6. well cementation self-oscillation float collar according to claim 4, it is characterised in that on the outer wall at upper shell upper port
It is provided with external screw thread, to be threadedly coupled between upper shell and lower shell, turbulence cavity overhead gage, the first concussion pipe nipple, the second concussion
Pipe nipple is threadedly coupled successively from top to bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810455787.9A CN108756808A (en) | 2018-05-14 | 2018-05-14 | Well cementation self-oscillation float collar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810455787.9A CN108756808A (en) | 2018-05-14 | 2018-05-14 | Well cementation self-oscillation float collar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108756808A true CN108756808A (en) | 2018-11-06 |
Family
ID=64010521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810455787.9A Pending CN108756808A (en) | 2018-05-14 | 2018-05-14 | Well cementation self-oscillation float collar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108756808A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5152342A (en) * | 1990-11-01 | 1992-10-06 | Rankin R Edward | Apparatus and method for vibrating a casing string during cementing |
| CN201250629Y (en) * | 2008-09-09 | 2009-06-03 | 中国石油集团川庆钻探工程有限公司井下作业公司 | Downhole hydraulic self-excited vibration pulse generator |
| CN103806863A (en) * | 2014-01-29 | 2014-05-21 | 中国石油集团西部钻探工程有限公司 | Hydraulic oscillation centering device |
| CN203742544U (en) * | 2014-04-02 | 2014-07-30 | 成都杜特威石油科技有限公司 | Well cementing device for ultrasonically processing downhole hydraulic pulse coupled concrete slurry |
| CN106014304A (en) * | 2016-06-30 | 2016-10-12 | 中国石油集团西部钻探工程有限公司 | Swirling flow device for well cementation |
| CN208546152U (en) * | 2018-05-14 | 2019-02-26 | 中国石油集团西部钻探工程有限公司 | Well cementation self-oscillation float collar |
-
2018
- 2018-05-14 CN CN201810455787.9A patent/CN108756808A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5152342A (en) * | 1990-11-01 | 1992-10-06 | Rankin R Edward | Apparatus and method for vibrating a casing string during cementing |
| CN201250629Y (en) * | 2008-09-09 | 2009-06-03 | 中国石油集团川庆钻探工程有限公司井下作业公司 | Downhole hydraulic self-excited vibration pulse generator |
| CN103806863A (en) * | 2014-01-29 | 2014-05-21 | 中国石油集团西部钻探工程有限公司 | Hydraulic oscillation centering device |
| CN203742544U (en) * | 2014-04-02 | 2014-07-30 | 成都杜特威石油科技有限公司 | Well cementing device for ultrasonically processing downhole hydraulic pulse coupled concrete slurry |
| CN106014304A (en) * | 2016-06-30 | 2016-10-12 | 中国石油集团西部钻探工程有限公司 | Swirling flow device for well cementation |
| CN208546152U (en) * | 2018-05-14 | 2019-02-26 | 中国石油集团西部钻探工程有限公司 | Well cementation self-oscillation float collar |
Non-Patent Citations (1)
| Title |
|---|
| 聂翠平;李相方;叶登胜;周正;邹详富;: "可钻型低频自激震荡脉动固井装置的研制与应用", 天然气工业, no. 09, 25 September 2012 (2012-09-25), pages 45 - 47 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104329073B (en) | Delay-to-open sliding sleeve | |
| CN105604525A (en) | Multi-stage plunger gas lift device and process for combined pipe column | |
| CN103388469B (en) | Packing tool | |
| CN105781488A (en) | Small-diameter constant-pressure throttling device for water injection well | |
| CN104453761B (en) | The reciprocating well cementation vibrator of pressure difference and method | |
| CN208546152U (en) | Well cementation self-oscillation float collar | |
| CN206830131U (en) | Sand setting constant pressure check valve for water injection well | |
| CN106368648A (en) | Intelligent fracturing wellhead device for shale gas exploitation | |
| CN107120079A (en) | Throwing and fishing type back flushing valve | |
| CN108071365A (en) | Coal bed gas production, drainage and water injection integrated tubular column | |
| CN207177817U (en) | One kind vibrations float collar | |
| CN207131370U (en) | A kind of vibration cementing pipe nipple | |
| CN108756808A (en) | Well cementation self-oscillation float collar | |
| CN203515522U (en) | Oil nozzle type oil well output liquid control device | |
| CN106285580A (en) | A kind of underground throttle device | |
| CN207905767U (en) | Recyclable tubular packer | |
| CN105298443A (en) | Oil pipe float valve and blowout prevention, gas lift and fracture combined operation method for underbalance well completion oil pipe descending | |
| CN205277368U (en) | Multi -functional oil pipe float collar | |
| CN209539340U (en) | Bridge-type diplopore low voltage difference antireflux injection well downhole flow regulator | |
| CN101929329A (en) | Gravel filling sand control device of horizontal well screen pipe | |
| CN207229076U (en) | Automatic fluid control device | |
| CN217761288U (en) | Gas-proof oil-well pump | |
| CN205422659U (en) | Novel reducing sand screen overflows | |
| CN110469292A (en) | A kind of circulation envelope alters method | |
| CN204299541U (en) | Tubing pump blowout hookup |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20201106 Address after: 100120 Beijing Xicheng District six laying Kang Applicant after: CHINA NATIONAL PETROLEUM Corp. Applicant after: CNPC Xibu Drilling Engineering Co.,Ltd. Address before: 830026 science and technology management division, West drilling and Drilling Engineering Institute, No. 326 South Central Road, Urumqi economic and Technological Development Zone, the Xinjiang Uygur Autonomous Region, China Applicant before: CNPC Xibu Drilling Engineering Co.,Ltd. |
|
| TA01 | Transfer of patent application right |