CN105443092B - A kind of four pipe layered water injection process pipe columns - Google Patents
A kind of four pipe layered water injection process pipe columns Download PDFInfo
- Publication number
- CN105443092B CN105443092B CN201610002105.XA CN201610002105A CN105443092B CN 105443092 B CN105443092 B CN 105443092B CN 201610002105 A CN201610002105 A CN 201610002105A CN 105443092 B CN105443092 B CN 105443092B
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- oil pipe
- bridge plug
- pipe
- middle level
- internal layer
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 75
- 238000002347 injection Methods 0.000 title claims abstract description 42
- 239000007924 injection Substances 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000002627 tracheal intubation Methods 0.000 claims description 26
- 239000003638 chemical reducing agent Substances 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 241001074085 Scophthalmus aquosus Species 0.000 claims 1
- 238000009826 distribution Methods 0.000 abstract description 5
- 238000007789 sealing Methods 0.000 description 11
- 238000005553 drilling Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000003129 oil well Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000002572 peristaltic effect Effects 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000012360 testing method Methods 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
- 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
- E21B43/20—Displacing by water
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1014—Flexible or expansible centering means, e.g. with pistons pressing against the wall of the well
- E21B17/1021—Flexible or expansible centering means, e.g. with pistons pressing against the wall of the well with articulated arms or arcuate springs
- E21B17/1028—Flexible or expansible centering means, e.g. with pistons pressing against the wall of the well with articulated arms or arcuate springs with arcuate springs only, e.g. baskets with outwardly bowed strips for cementing operations
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1042—Elastomer protector or centering means
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1078—Stabilisers or centralisers for casing, tubing or drill pipes
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/18—Pipes provided with plural fluid passages
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/14—Obtaining from a multiple-zone well
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (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)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a kind of four pipe layered water injection process pipe columns,Including casing and well head,It is equipped at intervals with top bridge plug successively from top to bottom in casing,Middle part bridge plug and lower part bridge plug,Top bridge plug,Middle part bridge plug and lower part bridge plug will be separated into four sections in an axial direction in casing,One water filling interval of every section of correspondence,Water injection pipe is by coaxial outer layer oil pipe,Middle level oil pipe and internal layer oil pipe are constituted,Outer layer oil pipe,Middle level oil pipe and internal layer oil pipe will radially separate complete outer ring waterflood path in casing,Annular waterflood path in outer,Middle annular waterflood path and central water flooding channel,The each interval of four pipes layered water injection process pipe column has independent waterflood path,Underground is without being arranged water dispensing apparatus,It realizes terrestrial operation and completes quantitative water distribution,Water distribution quantity control is more accurate,It adjusts more convenient,The four pipes layered water injection process pipe column has simple in structure,Reliable operation,It is easy to operate,The advantages that easy to maintain.
Description
Technical field
The present invention relates to a kind of flushing process pipe string, especially a kind of four pipe layered water injection process pipe columns.
Background technology
Eccentric separate layer water injection string is mostly used to oil well delamination water filling in the prior art, this tubing string centered on oil pipe,
Oil well is divided into several intervals by packer, the interval for carrying out injection allocation is being needed to connect eccentric injection mandrel with position, it is this
Two sections of two-stage and three sections of seperated layer water injections of three-level may be implemented in eccentric separate layer water injection string.But this eccentric separate layer water injection string
Eccentric injection mandrel setting in underground, adjust water injection rate and need to replace water nozzle by fishing plugging device and could realize, and need
Using test carriage, there are the shortcomings of complicated for operation, adjusting is inaccurate, and maintenance cost is high, once injection well downhole flow regulator failure during use,
Entire tubing string can only be risen to replace, and tubing string rise during be easy to happen packer and do not unseal and cause the feelings such as Ka Jing
Condition will produce a large amount of maintenance cost, wasting manpower and material resources.
Invention content
Technical problems to be solved by the inivention are：A kind of four pipe layered water injection process pipe columns, the four pipes seperated layer water injection work are provided
The each interval of skill tubing string has independent waterflood path, underground to realize terrestrial operation it is not necessary that water dispensing apparatus is arranged and complete to quantify
Water distribution, water distribution quantity control is more accurate, it is more convenient to adjust, the four pipes layered water injection process pipe column have simple in structure, reliable operation,
The advantages that easy to operate, easy to maintain.
The technical solution adopted for solving the technical problem：A kind of four pipe layered water injection process pipe columns, including casing and well head,
Be equipped at intervals with top bridge plug, middle part bridge plug and lower part bridge plug successively from top to bottom in casing, top bridge plug, middle part bridge plug and under
Portion's bridge plug will be separated into four sections in an axial direction in casing, one water filling interval of every section of correspondence, water injection pipe by coaxial outer layer oil pipe, in
Layer oil pipe and internal layer oil pipe are constituted, and outer layer oil pipe, middle level oil pipe and internal layer oil pipe will radially separate complete outer ring in casing
Waterflood path, outer middle annular waterflood path, middle annular waterflood path and central water flooding channel, outer layer oil pipe lower end connect outer oil
The seal of tube is intubated, and outer layer tubing seal intubation is close using pump clearance fit and cushion rubber dual-seal, outer layer oil pipe with top bridge plug
Envelope is intubated circumferential weld between lower edge and middle level oil pipe and constitutes outer middle water filling port, and termination middle level tubing seal is intubated under the oil pipe of middle level, in
Layer tubing seal intubation with middle part bridge plug using pump clearance fit and cushion rubber dual-seal, middle level tubing seal be intubated lower edge with it is interior
Interior water filling port during circumferential weld is constituted between layer oil pipe, termination internal layer tubing seal intubation under internal layer oil pipe, internal layer tubing seal intubation
With lower part bridge plug using pump clearance fit and cushion rubber dual-seal, internal layer oil pipe lower ending opening constitutes central water flooding mouth.
As an improvement of the present invention：On top, the top of bridge plug is equipped with outer layer tubing centrilizer, bridge plug and middle part on top
It is equipped with middle level tubing centrilizer between bridge plug, internal layer tubing centrilizer is equipped between middle part bridge plug and lower part bridge plug.
The middle level tubing centrilizer and internal layer tubing centrilizer are elastic centralizer.
The elastic centralizer is made of top connection, lower contact and polylith arc spring plate, in top connection and lower contact
Outer wall is equipped with arc spring plate length compensation guide chute corresponding with arc spring plate number.
As a further improvement on the present invention：The bridge plug is drilling type composite bridge plug.
Further improvement as the present invention：It is equipped with reducing on the top of outer layer oil pipe, middle level oil pipe and internal layer oil pipe
Connector, outer layer oil pipe, middle level oil pipe and internal layer oil pipe are connect after reducer union is expanding with wellhead assembly.
Advantageous effect：The present invention four pipe layered water injection process pipe columns as a result of coaxial casing, outer layer oil pipe, in
Inside pipe casing, is radially separated into four relatively independent waterflood paths, using top bridge by layer oil pipe and the combination of internal layer oil pipe
Oil well is separated out four sections by plug, middle part bridge plug and lower part bridge plug, and is coordinated with three bridge plugs using three sealing intubations, by four
The water filling port of independent waterflood path has dedicated waterflood path every being enclosed in corresponding interval, to realize each interval,
It is four independent water fillings of interval with four relatively independent waterflood paths, since the waterflood path of each interval is independent, each layer
Section water filling is not interfere with each other, and therefore, different parameter accurate quantification water distributions, also, each pipe can be used according to the characteristic of each interval
Between annular space only make waterflood path use, without underground be arranged water dispensing apparatus, but by all water dispensing apparatus be arranged in well
On, it not only manipulates, is easy to control, it is easy to maintain, the pulling distributing tap operation using eccentric separate layer water injection string is also eliminated the need, gram
It needs entire tubing string acting the defect for and replacing, four pipes of the invention after having taken eccentric separate layer water injection string injection well downhole flow regulator failure
Layered water injection process pipe column the operation is stable, reliability are high.It is equipped with outer layer oil pipe righting as a result of in the top of top bridge plug
Device is equipped with middle level tubing centrilizer between top bridge plug and middle part bridge plug, is equipped between middle part bridge plug and lower part bridge plug interior
The technical characteristic of layer tubing centrilizer, on the one hand reduces the oil pipe wriggling amplitude in the injecting process, each pipe is made to remain coaxial,
It avoids rubbing between adjacent tube wall, is on the other hand conducive to sealing intubation and bridge plug Dock With Precision Position, and can prevent oil pipe from shaking
And the sealing effect between sealing intubation and bridge plug is influenced, keep the four pipe layered water injection process pipe column installations of the present invention more square
Just, it works more stable, the service life is longer.As a result of the technical characteristic that the bridge plug is drilling type composite bridge plug, pipe is played
The card well situation that packer does not unseal will not occur when column, bridge plug can be bored by staying in three of underground, drilling can be fallen easily, will not
Influence subsequent construction operation.It is equipped with reducer union as a result of on the top of outer layer oil pipe, middle level oil pipe and internal layer oil pipe,
Outer layer oil pipe, middle level oil pipe and internal layer oil pipe it is expanding after the technical characteristic that is connect with wellhead assembly, enable oil pipe easily with show
There are bridge plug and the wellhead assembly of standard specification mating, improve the versatility of equipment, has saved scrap build cost.
Description of the drawings
Fig. 1 is the structure principle chart of the four pipe layered water injection process pipe columns of the present invention；
Fig. 2 is the waterflood path structure principle chart of the four pipe layered water injection process pipe columns of the present invention；
Fig. 3 be the present invention four pipe layered water injection process pipe columns in elastic centralizer enlarged structure schematic diagram.
Specific implementation mode
The four pipe layered water injection process pipe columns of the present invention are described in further detail below in conjunction with the accompanying drawings.
As shown in Figure 1, the four pipe layered water injection process pipe columns of the present invention, including casing 1 and well head, in casing from upper and
Under be equipped at intervals with top bridge plug 7, middle part bridge plug 10 and lower part bridge plug 13 successively, top bridge plug, middle part bridge plug and lower part bridge plug will
Four sections of upper, middle and lower, bottom is separated into casing in an axial direction, one water filling interval of every section of correspondence, water injection pipe is by concentric outer layer oil pipe
4, middle level oil pipe 3 and internal layer oil pipe 2 are constituted.
As shown in Fig. 2, outer layer oil pipe, middle level oil pipe and internal layer oil pipe will radially separate complete outer ring water filling in casing
Channel 15, outer middle annular waterflood path 16, middle annular waterflood path 17 and central water flooding channel 18.
Outer layer oil pipe lower end connects outer layer tubing seal intubation 8, and outer layer tubing seal intubation is with top bridge plug using pump gap
Cooperation and cushion rubber dual-seal, water filling port during outer layer tubing seal is intubated between lower edge and middle level oil pipe outside circumferential weld composition, in being
Section water filling；Middle level tubing seal intubation 11 is terminated under the oil pipe of middle level, tubing seal intubation in middle level is with middle part bridge plug using pump gap
Cooperation and cushion rubber dual-seal, middle level tubing seal is intubated between lower edge and internal layer oil pipe interior water filling port in circumferential weld composition, under
Section water filling；Internal layer tubing seal intubation 14 is terminated under internal layer oil pipe, internal layer tubing seal intubation is with lower part bridge plug using pump gap
Cooperation and cushion rubber dual-seal, internal layer oil pipe lower ending opening constitute central water flooding mouth, are bottom section water filling；Between outer layer oil pipe and casing
Annular space be epimere water filling.
On top, the top of bridge plug is equipped with outer layer tubing centrilizer 5, and middle level is equipped between top bridge plug and middle part bridge plug
Tubing centrilizer 9, between middle part bridge plug and lower part bridge plug be equipped with internal layer tubing centrilizer 12, the middle level tubing centrilizer and
Internal layer tubing centrilizer is elastic centralizer.
As shown in figure 3, the elastic centralizer is made of top connection 19, lower contact 22 and polylith arc spring plate 21,
The outer wall of top connection and lower contact is equipped with arc spring plate length compensation guide chute corresponding with arc spring plate number 20.Often
Three blocks of arc spring plates, the angularly display arrangement centered on oil pipe axis of arc spring plate is at least arranged in a elastic centralizer.
The outer diameter of top connection and lower contact should ensure that elastic centralizer can be passed through from the oil pipe of its outer layer, arc spring plate length compensation
When the length of guide chute should be guaranteed that elastic centralizer passes through oil pipe, when accommodating arc spring plate because being squeezed by tube inner wall
The length of stretching, extension.
As an improvement of the present invention：It is equipped with reducer union 6 on the top of outer layer oil pipe, middle level oil pipe and internal layer oil pipe, outside
Layer oil pipe, middle level oil pipe and internal layer oil pipe are connect after reducer union is expanding with wellhead assembly.
Bridge plug used in the present invention is preferably Y445-112mm drilling type composite bridge plugs, and casing is 5 1/2 " casing,
Outer layer oil pipe epimere is 3 1/2, and " oil pipe, middle level oil pipe epimere are 2 3/8 " oil pipe, hypomere are 1.315 " oil pipes, on internal layer oil pipe
Section is 1.315, and " oil pipe, hypomere are 22mm oil pipes, and outer layer tubing centrilizer is 118mm centralizers, and middle level tubing centrilizer is 33-
124mm elastic centralizers, internal layer tubing centrilizer are 22-124mm elastic centralizers, and outer layer tubing seal intubation is that 55mm is sealed
It is 42mm sealings intubation that intubation, middle level tubing seal, which are intubated, internal layer tubing seal intubation is that 22mm sealings are intubated, of the invention four
Pipe layered water injection process pipe column is used cooperatively with the four road water injection wells with four independent control waterflood paths.
The present invention four pipe layered water injection process pipe column construction methods be：
1. bridge plug setting tool is connect with that can bore bridge plug, lower to arrive design position, can bore bridge plug sets, by bridge after setting
It fills in setting tool to rise, sets three bridge plugs successively by the sequence to get on, get off.
2. righting type sealing intubation is connected to below oil pipe, lower oil pipe, oil pipe is under from outer layer to internal layer sequence.
3. sealing is intubated about 10 meters from bridge plug, slowly transferred after should slowly descending drain line, sealing intubation to be docked with bridge plug
Oil pipe when weight indicator changes, under illustrating sealing intubation in place, oil pipe certain distance is above carried according to well depth, in order to avoid water filling
When oil pipe peristaltic forces repeated action on bridge plug, influence the sealing effect of bridge plug.
4. according to oil pipe from internal layer to outer layer sequence when lift pipe string.
Bridge plug is removed 5. boring.
Claims (5)
1. a kind of four pipe layered water injection process pipe columns, including casing and well head, it is characterized in that：In casing from top to bottom successively between
Every equipped with top bridge plug, middle part bridge plug and lower part bridge plug, top bridge plug, middle part bridge plug and lower part bridge plug will in an axial direction divide in casing
Four sections are divided into, one water filling interval of every section of correspondence, water injection pipe is made of coaxial outer layer oil pipe, middle level oil pipe and internal layer oil pipe,
Outer layer oil pipe, middle level oil pipe and internal layer oil pipe will radially separate complete outer ring waterflood path, outer middle annular water filling in casing
Channel, middle annular waterflood path and central water flooding channel, outer layer oil pipe lower end connect outer layer tubing seal intubation, and outer layer oil pipe is close
Envelope intubation with top bridge plug using pump clearance fit and cushion rubber dual-seal, outer layer tubing seal be intubated lower edge and middle level oil pipe it
Between circumferential weld constitute it is outer in water filling port, termination middle level tubing seal intubation, middle level tubing seal intubation and middle part bridge under the oil pipe of middle level
It fills in using pump clearance fit and cushion rubber dual-seal, middle level tubing seal is intubated interior in circumferential weld composition between lower edge and internal layer oil pipe
Water filling port, termination internal layer tubing seal intubation under internal layer oil pipe, internal layer tubing seal intubation are matched with lower part bridge plug using gap is pumped
It closes and cushion rubber dual-seal, internal layer oil pipe lower ending opening constitutes central water flooding mouth, the top of bridge plug is equipped with outer layer oil pipe on top
Centralizer is equipped with middle level tubing centrilizer between top bridge plug and middle part bridge plug, is set between middle part bridge plug and lower part bridge plug
There is internal layer tubing centrilizer.
2. four pipes layered water injection process pipe column according to claim 1, it is characterized in that：The middle level tubing centrilizer and interior
Layer tubing centrilizer is elastic centralizer.
3. four pipes layered water injection process pipe column according to claim 2, it is characterized in that：The elastic centralizer is connect from above
Head, lower contact and polylith arc spring plate are constituted, and are equipped in the outer wall of top connection and lower contact corresponding with arc spring plate number
Arc spring plate length compensation guide chute.
4. four pipes layered water injection process pipe column according to any one of claims 1 to 3, it is characterized in that：The bridge plug is can
Brill formula composite bridge plug.
5. four pipes layered water injection process pipe column according to claim 4, it is characterized in that：Outer layer oil pipe, middle level oil pipe and
The top of internal layer oil pipe be equipped with reducer union, outer layer oil pipe, middle level oil pipe and internal layer oil pipe after reducer union is expanding with well head
Device connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610002105.XA CN105443092B (en) | 2016-01-05 | 2016-01-05 | A kind of four pipe layered water injection process pipe columns |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610002105.XA CN105443092B (en) | 2016-01-05 | 2016-01-05 | A kind of four pipe layered water injection process pipe columns |
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| Publication Number | Publication Date |
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| CN105443092A CN105443092A (en) | 2016-03-30 |
| CN105443092B true CN105443092B (en) | 2018-10-02 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109322648B (en) * | 2017-07-31 | 2023-10-31 | 中国石油天然气股份有限公司 | Separate injection pipe column for oil well water injection and use method |
| CN109751020B (en) * | 2019-01-17 | 2023-08-22 | 中国石油天然气股份有限公司 | Intelligent layered water injection and layered oil production pipe column for horizontal well and technological method |
| CN111502594B (en) * | 2020-04-28 | 2024-05-10 | 大庆兴华天义石油钻采设备制造有限公司 | Double-tube separate injection tool capable of drilling bridge plug |
| CN111706306B (en) * | 2020-07-22 | 2024-05-24 | 沈阳华威石油机械制造有限公司 | Three-pipe concentric layered water injection pipe column |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202544824U (en) * | 2012-03-27 | 2012-11-21 | 中国海洋石油总公司 | Concentric double-pipe hierarchical injection pipe column |
| CN103573210A (en) * | 2012-08-02 | 2014-02-12 | 中国石油化工股份有限公司 | Quick drill composite pipe bridge plug |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102913147A (en) * | 2012-10-29 | 2013-02-06 | 陕西联盟物流有限公司 | Centralizer |
| US9810049B2 (en) * | 2014-06-25 | 2017-11-07 | Chevron U.S.A. Inc. | Systems and methods for inline chemical injection for dump flood water injectors |
| CN104141477B (en) * | 2014-07-28 | 2017-01-25 | 克拉玛依市红都有限责任公司 | Concentric three-tube separated layer water injection device and using method thereof |
| CN104389567A (en) * | 2014-11-21 | 2015-03-04 | 中国石油天然气股份有限公司 | Layered injection tubular column and layered injection method |
| CN205349311U (en) * | 2016-01-05 | 2016-06-29 | 沈阳华威石油机械制造有限公司 | Four tubs of layering water injection technology tubular columns |
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2016
- 2016-01-05 CN CN201610002105.XA patent/CN105443092B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202544824U (en) * | 2012-03-27 | 2012-11-21 | 中国海洋石油总公司 | Concentric double-pipe hierarchical injection pipe column |
| CN103573210A (en) * | 2012-08-02 | 2014-02-12 | 中国石油化工股份有限公司 | Quick drill composite pipe bridge plug |
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