CN103758496B - Nitrogen flooding concentric layered steam injection pipe column and method - Google Patents
Nitrogen flooding concentric layered steam injection pipe column and method Download PDFInfo
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- CN103758496B CN103758496B CN201410001417.XA CN201410001417A CN103758496B CN 103758496 B CN103758496 B CN 103758496B CN 201410001417 A CN201410001417 A CN 201410001417A CN 103758496 B CN103758496 B CN 103758496B
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- steam injection
- nitrogen
- tubing string
- annular space
- pipe
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 159
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 80
- 238000010793 Steam injection (oil industry) Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000002347 injection Methods 0.000 claims abstract description 39
- 239000007924 injection Substances 0.000 claims abstract description 39
- 230000013011 mating Effects 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 7
- 238000012856 packing Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 14
- 230000008901 benefit Effects 0.000 abstract description 6
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 6
- 239000000203 mixture Substances 0.000 description 3
- 230000005465 channeling Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 150000002829 nitrogen Chemical class 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention provides a nitrogen flooding concentric layered steam injection pipe column and a method, wherein the nitrogen flooding concentric layered steam injection pipe column comprises: the outer pipe column comprises an outer pipe, an upper packer, a first sieve pipe and a lower packer which are sequentially connected from top to bottom, wherein the lower end of the lower packer is connected with a sealer through a coupling; the inner pipe tubular column, including looping through inner tube, sealed tube and the second screen pipe that oil pipe connected from top to bottom, the bottom of second screen pipe is connected with the plug, when the inner pipe tubular column was inserted and is located the outer pipe tubular column, is formed with annular space between inner tube and the outer pipe tubular column, and the sealed tube then the joint is fixed in the inner chamber of sealer, and its lateral wall corresponds closely with the inside wall of sealer, and the second screen pipe is located the downside of sealer. According to the nitrogen flooding concentric layered steam injection pipe column and the method, the control capability of injecting nitrogen is enhanced by adjusting and controlling the steam injection quantity of each layer, so that uniform utilization of a reservoir is realized, and the economic benefit of nitrogen injection gas exploitation is improved.
Description
Technical field
The present invention relates to a kind of nitrogen flooding concentric layers steam injection string and method, be applicable to need layering nitrogen injection to drive the thin oil of exploitation, high solidifying oil or heavy crude reservoir.
Background technology
At present, domestic multiple field use nitrogen injection drives production practice technology and improves difficult-to-produce reserves recovery ratio, mainly comprises block buried hill fissure oil-gas reservoir, block glutenite oil-gas reservoir, low-permeability sandstone oil-gas reservoir, unconventionaloil pool Tibetan etc.Its mechanism mainly contains three aspects: one is utilize the dilatancy of nitrogen with excellent to carry out elasticity to drive; Two is utilize the water-fast feature of nitrogen to carry out water cone, water breakthrough control; Three is utilize the gravitational differentiation of nitrogen to carry out gas cap drive.But the nitrogen injection tubing string adopted at present is generally the mode adopting general steam injection, deposits problem in the following areas: one, be cannot control nitrogen injection; Two, reservoir cannot be realized evenly to employ; Three, has channeling is comparatively serious, and production-injection ratio is low, and then has had a strong impact on economic benefit.
Therefore, necessary design a kind of nitrogen flooding concentric layers steam injection string and method, to overcome the defect of prior art.
Summary of the invention
The object of the invention is to be to provide a kind of nitrogen flooding concentric layers steam injection string and method, by the regulation and control to each interval steam injection amount, strengthen the control ability to nitrogen injection, realize reservoir and evenly employ, improve nitrogen injection exploitation economic benefit.
For this reason, the present invention proposes a kind of nitrogen flooding concentric layers steam injection string, and it comprises:
Outer tube tubing string, comprise the outer tube, upper packer, the first screen casing and the lower packet that connect successively from top to bottom, the lower end of described lower packet is connected with sealer by box cupling;
Interior pipe tubing string, comprise pipe, sealed tube and the second screen casing in being connected by oil pipe successively from top to bottom, the bottom of described second screen casing is connected with plug, when described interior pipe tubing string is inserted in described outer tube tubing string, annular space is formed between described interior pipe and described outer tube tubing string, described sealed tube is then fixed in the inner chamber of described sealer, and its lateral wall is corresponding with the inside wall of described sealer closely connected, and described second screen casing is positioned at the downside of described sealer.
Nitrogen flooding concentric layers steam injection string as above, wherein, described sealer is a tubing string, its inside wall is convexly equipped with a ring portion, the medial surface of described ring portion is formed with a conical surface and one first anchor ring from top to bottom successively, the internal diameter of described conical surface lower end is identical with the internal diameter of described first anchor ring, and be less than the internal diameter of described conical surface upper end, the lateral wall of described sealed tube is provided with a mating face and the second anchor ring successively, the mating shapes of described mating face and the described conical surface, both are corresponding closely connected and be fixed, described second anchor ring then corresponding sealing mutually with described first anchor ring contacts.
Nitrogen flooding concentric layers steam injection string as above, wherein, the described conical surface is evenly equipped with multiple protuberance vertically, described mating face is then evenly equipped with multiple recess vertically, and each described protuberance correspondence is embedded in each described recess.
Nitrogen flooding concentric layers steam injection string as above, wherein, described protuberance and recess are circulus, and correspondence is arranged on the described conical surface and mating face.
Nitrogen flooding concentric layers steam injection string as above, wherein, is connected by oil pipe column between described upper packer, the first screen casing and lower packet further successively.
Nitrogen flooding concentric layers steam injection string as above, wherein, described upper packer and lower packing are Y521 type packer or Y453 type packer.
The present invention also proposes a kind of nitrogen flooding concentric layers steam injection method, adopts nitrogen flooding concentric layers steam injection string as above, and described nitrogen flooding concentric layers steam injection method comprises the following steps:
A) by the assigned address in described outer tube tubing string lower going-into-well cylinder, make the position of described first screen casing relative with the upside oil reservoir of down-hole, subsequently, set described upper packer and lower packet, so that the oil jacket annular space between described outer tube tubing string and pit shaft is divided into upper annular space, middle annular space and lower annular space;
B) described interior pipe tubing string is inserted in described outer tube tubing string, to form concentric tube column, and make the position of described second screen casing relative with the downside oil reservoir of down-hole, wherein, be formed with annular space between described interior pipe and described outer tube tubing string, the inside wall of the lateral wall of described sealed tube and described sealer is corresponding closely connected and be fixed;
C) from ground respectively to nitrogen injection described annular space, interior pipe, wherein, the nitrogen injecting described annular space enters oil reservoir on the upside of this through described first screen casing, annular space, and the nitrogen injecting described interior pipe enters oil reservoir on the downside of this by described second screen casing, lower annular space.
Nitrogen flooding concentric layers steam injection method as above; wherein; in step b) and step c) between; also comprise step b1): in the upper annular space formed between described outer tube tubing string and described pit shaft, inject pit shaft protect liquid, make described pit shaft protect liquid to be filled in the upside of described upper packer.
Nitrogen flooding concentric layers steam injection string provided by the invention and method, achieve the laminated distributor under well steam injection that nitrogen injection drives well, by the regulation and control to each interval steam injection amount, strengthen the control ability to nitrogen injection, realize reservoir evenly to employ, improve production-injection ratio, extend gas injection cycle, promote gas injection effect and nitrogen injection exploitation economic benefit.
Accompanying drawing explanation
The following drawings is only intended to schematically illustrate the present invention and explain, not delimit the scope of the invention.Wherein:
Fig. 1 is the composition structural representation of nitrogen flooding concentric layers steam injection string of the present invention.
Fig. 2 is the partial enlarged drawing at A place in Fig. 1, and the sealer shown in figure and sealed tube are in separated position.
Critical element label declaration:
11 outer tube 12 upper packers
13 first screen casing 14 lower packets
141 box cupling 15 sealers
150 ring portion 151 conical surfaces
1511 protuberance 152 first anchor rings
16 oil pipe column 20 oil pipes
Pipe 22 sealed tube in 21
221 mating face 2211 recesses
222 second anchor ring 23 second screen casings
24 plug H annular spaces
Detailed description of the invention
The invention provides a kind of nitrogen flooding concentric layers steam injection string, it comprises: outer tube tubing string, and comprise the outer tube, upper packer, the first screen casing and the lower packet that connect successively from top to bottom, the lower end of described lower packet is connected with sealer by box cupling; Interior pipe tubing string, comprise pipe, sealed tube and the second screen casing in being connected by oil pipe successively from top to bottom, the bottom of described second screen casing is connected with plug, when described interior pipe tubing string is inserted in described outer tube tubing string, annular space is formed between described interior pipe and described outer tube tubing string, described sealed tube is then fixed in the inner chamber of described sealer, and its lateral wall is corresponding with the inside wall of described sealer closely connected, and described second screen casing is positioned at the downside of described sealer.
The present invention also provides a kind of nitrogen flooding concentric layers steam injection method, comprise the following steps: by the assigned address in described outer tube tubing string lower going-into-well cylinder, make the position of described first screen casing relative with the upside oil reservoir of down-hole, subsequently, set described upper packer and lower packet, so that the oil jacket annular space between described outer tube tubing string and pit shaft is divided into upper annular space, middle annular space and lower annular space; Described interior pipe tubing string is inserted in described outer tube tubing string, to form concentric tube column, and make the position of described second screen casing relative with the downside oil reservoir of down-hole, wherein, be formed with annular space between described interior pipe and described outer tube tubing string, the inside wall of the lateral wall of described sealed tube and described sealer is corresponding closely connected and be fixed; From ground respectively to nitrogen injection described annular space, interior pipe, wherein, the nitrogen injecting described annular space enters oil reservoir on the upside of this through described first screen casing, annular space, and the nitrogen injecting described interior pipe enters oil reservoir on the downside of this by described second screen casing, lower annular space.
Nitrogen flooding concentric layers steam injection string of the present invention and method, the laminated distributor under well steam injection that nitrogen injection drives well can be realized, strengthen the control ability to nitrogen injection, ensure that reservoir is evenly employed, and then improve production-injection ratio, extend gas injection cycle, improve gas injection effect, improve nitrogen injection and drive exploitation economic benefit, ensure that the gas tightness of gas injection tube column simultaneously.
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, below in conjunction with accompanying drawing and preferred embodiment, the nitrogen flooding concentric layers steam injection string propose the present invention and the detailed description of the invention of method, structure, feature and effect, be described in detail as follows.In addition, by the explanation of detailed description of the invention, when can to the present invention for the technological means reaching predetermined object and take and effect are goed deep into concrete understanding more, but institute's accompanying drawing be only to provide with reference to and use is described, is not used for being limited the present invention.
Fig. 1 is the composition structural representation of nitrogen flooding concentric layers steam injection string of the present invention.Fig. 2 is the partial enlarged drawing at A place in Fig. 1, and the sealer shown in figure and sealed tube are in separated position.
As shown in Figure 1, the nitrogen flooding concentric layers steam injection string that the present invention proposes, it comprises outer tube tubing string and interior pipe tubing string.Wherein, described outer tube tubing string comprises the outer tube 11, upper packer 12, first screen casing 13 and the lower packet 14 that connect successively from top to bottom, and the lower end of described lower packet 14 is connected with sealer 15 by box cupling 141;
Described interior pipe tubing string, comprise pipe 21, sealed tube 22 and the second screen casing 23 in being connected by oil pipe 20 successively from top to bottom, the bottom of described second screen casing 23 is connected with plug 24, when described interior pipe tubing string is inserted in described outer tube tubing string, annular space H is formed between described interior pipe 21 and described outer tube tubing string, described sealed tube 22 is fixed in the inner chamber of described sealer 15, and its lateral wall is corresponding closely connected with the inside wall of described sealer 15, described second screen casing 23 is positioned at the downside of described sealer 15.
Wherein, please also refer to Fig. 2, described sealer 15 is a tubing string, its inside wall is convexly equipped with a ring portion 150, the medial surface of described ring portion 150 is formed with the conical surface 151 and one first anchor ring 152 from top to bottom successively, the internal diameter of the described conical surface 151 lower end is identical with the internal diameter of described first anchor ring 152, and be less than the internal diameter of the described conical surface 151 upper end, the lateral wall of described sealed tube 22 is provided with mating face 221 and second anchor ring 222 successively, the mating shapes of described mating face 221 and the described conical surface 151, both are corresponding closely connected and be fixed, described second anchor ring 222 correspondences seal with described first anchor ring 152 phase and contact.Specifically, the internal diameter of described ring portion 150 upper end is greater than the internal diameter of its lower end, the described conical surface is formed to make its medial surface, and the lateral wall of described sealed tube 22 makes another cone structure (i.e. this mating face) matched with this conical surface, thus, sealing device 15 and sealing pipe 22 are connected and fixed mutually by the mode of taper fit, have both been convenient to both mutual location, can have reached preferably sealing performance.Certainly, for the combination of sealer 15 with sealed tube 22, be not limited to above structure, such as, both can directly be fixed by the mode of tight fit (transition or interference fit), in addition, under enter interior pipe tubing string and be, after sealed tube contacts with sealer, pipe tubing string in normally slowly rotating forward, slowly to increase the load of interior pipe tubing string, to make sealed tube and sealer, there is good sealing effectiveness.
Wherein, in order to improve the sealing effectiveness between sealer and sealed tube, the preferred described conical surface 151 is evenly equipped with multiple protuberance 1511 vertically, described mating face 221 is then evenly equipped with multiple recess 2211 vertically, each described protuberance 1511 correspondence is embedded in each described recess 2211.It is worth mentioning that, the height of this protuberance and the degree of depth of recess are grade, have both been convenient to sealer and the mutual clamping of sealed tube, are beneficial to again and realize sealing mutually.
Further, described protuberance 1511 and recess 2211 are circulus, and correspondence is arranged on the described conical surface 151 and mating face 221, and namely the cross section on this conical surface, mating face is the structure of wave wire, to improve sealing performance.
In addition, being connected by oil pipe column 16 successively further between described upper packer 12, first screen casing 13 and lower packet 14, operationally, by choosing the oil pipe column of different length, being satisfied with the user demand of different well depth.
In addition, preferred described upper packer 12 and lower packing 14 are Y521 type packer, in use, by rotating, on carry and transfer outer tube tubing string, setting of packer can be realized, simple to operation, certainly, in actual job, be not limited to Y521 type packer, such as, described upper packer and lower packet also can select Y453 type packer, and because the process that sets of above-mentioned packer is prior art, therefore not to repeat here;
At work, this interior pipe tubing string is inserted in outer tube tubing string, composition concentric tube column, be connected to below wellhead assembly again and utilize surface line, respectively to annular space and interior pipe tubing string nitrogen injection, nitrogen flooding operation is implemented to the upside oil reservoir of differing heights, oil reservoir place, downside interval with correspondence, specifically, utilizing surface line in the process of nitrogen injection in pit shaft, by the annular space nitrogen injection between described outer tube tubing string and interior pipe tubing string and enter upside oil reservoir, by interior pipe tubing string nitrogen injection and enter downside oil reservoir.In addition, because upside oil reservoir, downside oil reservoir are each via independent path implement nitrogen injection, therefore, can regulate and control the nitrogen injection rate of each oil reservoir easily, extend gas injection cycle, realize reservoir and evenly employ, can production-injection ratio be improved simultaneously, overcome the deficiency that prior art has channeling is serious.It is pointed out that above-mentioned wellhead assembly and surface line are prior art, therefore not to repeat here.
The present invention also proposes a kind of nitrogen flooding concentric layers steam injection method, and the method adopts above-mentioned steam injection string, and specifically, this nitrogen flooding concentric layers steam injection method comprises the following steps:
A) by described outer tube tubing string lower going-into-well cylinder 3 assigned address, make the position of described first screen casing 13 relative with the upside oil reservoir 41 of down-hole, subsequently, setting described upper packer 12 and lower packet 14, is upper annular space 51, middle annular space 52 and lower annular space 53 the oil jacket annular space between described outer tube tubing string and pit shaft 3 to be separated 5;
B) described interior pipe tubing string is inserted in described outer tube tubing string, to form concentric tube column, and make the position of described second screen casing 23 relative with the downside oil reservoir 42 of down-hole, wherein, be formed with annular space H between described interior pipe 21 and described outer tube tubing string, the inside wall of the lateral wall of described sealed tube 15 and described sealer 15 is corresponding closely connected and be fixed;
C) from ground respectively to nitrogen injection described annular space H, interior pipe 21, wherein, the nitrogen injecting described annular space H enters oil reservoir 41 on the upside of this through described first screen casing 13, annular space 52, the nitrogen injecting described interior pipe 21 enters oil reservoir 42 on the downside of this by described second screen casing 23, lower annular space 53, also be, shown in figure, nitrogen enters oil reservoir 41 and downside oil reservoir 42 on the upside of this, to realize the operation each oil reservoir being carried out to nitrogen flooding by described first screen casing 13, second screen casing 23 correspondence.
Step a) and step b) between, also comprise step b1): in the space between described outer tube tubing string and described pit shaft 3, inject pit shaft protect liquid 6, make described pit shaft protect liquid 6 be filled in the upper annular space 51 on the upside of described upper packer 14.By injecting pit shaft protection liquid, the inside and outside pressure of outer tube 11 operationally can be balanced, protection outer tube 11 and pit shaft 3.
Nitrogen flooding concentric layers steam injection string provided by the invention and method, achieve the laminated distributor under well steam injection that nitrogen injection drives well, by the regulation and control to each interval steam injection amount, strengthen the control ability to nitrogen injection, realize reservoir evenly to employ, improve production-injection ratio, extend gas injection cycle, promote gas injection effect and nitrogen injection exploitation economic benefit.
The foregoing is only the schematic detailed description of the invention of the present invention, and be not used to limit scope of the present invention.Any those skilled in the art, the equivalent variations done under the prerequisite not departing from design of the present invention and principle and amendment, all should belong to the scope of protection of the invention.
Claims (7)
1. a nitrogen flooding concentric layers steam injection string, is characterized in that, described nitrogen flooding concentric layers steam injection string comprises:
Outer tube tubing string, comprise the outer tube, upper packer, the first screen casing and the lower packet that connect successively from top to bottom, the lower end of described lower packet is connected with sealer by box cupling;
Interior pipe tubing string, comprise pipe, sealed tube and the second screen casing in being connected by oil pipe successively from top to bottom, the bottom of described second screen casing is connected with plug, when described interior pipe tubing string is inserted in described outer tube tubing string, annular space is formed between described interior pipe and described outer tube tubing string, described sealed tube is then fixed in the inner chamber of described sealer, and its lateral wall is corresponding with the inside wall of described sealer closely connected, and described second screen casing is positioned at the downside of described sealer;
Wherein, described sealer is a tubing string, its inside wall is convexly equipped with a ring portion, the medial surface of described ring portion is formed with a conical surface and one first anchor ring from top to bottom successively, the internal diameter of described conical surface lower end is identical with the internal diameter of described first anchor ring, and be less than the internal diameter of described conical surface upper end, the lateral wall of described sealed tube is provided with a mating face and the second anchor ring successively, the mating shapes of described mating face and the described conical surface, both are corresponding closely connected and be fixed, and described second anchor ring then corresponding sealing mutually with described first anchor ring contacts.
2. nitrogen flooding concentric layers steam injection string as claimed in claim 1, it is characterized in that, the described conical surface is evenly equipped with multiple protuberance vertically, described mating face is then evenly equipped with multiple recess vertically, each described protuberance correspondence is embedded in each described recess.
3. nitrogen flooding concentric layers steam injection string as claimed in claim 2, it is characterized in that, described protuberance and recess are circulus, and correspondence is arranged on the described conical surface and mating face.
4. nitrogen flooding concentric layers steam injection string as claimed in claim 1, be is characterized in that, be connected successively further between described upper packer, the first screen casing and lower packet by oil pipe column.
5. nitrogen flooding concentric layers steam injection string as claimed in claim 1, it is characterized in that, described upper packer and lower packing are Y521 type packer or Y453 type packer.
6. a nitrogen flooding concentric layers steam injection method, adopt the nitrogen flooding concentric layers steam injection string according to any one of claim 1 to 5, described nitrogen flooding concentric layers steam injection method comprises the following steps:
A) by the assigned address in described outer tube tubing string lower going-into-well cylinder, make the position of described first screen casing relative with the upside oil reservoir of down-hole, subsequently, set described upper packer and lower packet, so that the oil jacket annular space between described outer tube tubing string and pit shaft is divided into upper annular space, middle annular space and lower annular space;
B) described interior pipe tubing string is inserted in described outer tube tubing string, to form concentric tube column, and make the position of described second screen casing relative with the downside oil reservoir of down-hole, wherein, be formed with annular space between described interior pipe and described outer tube tubing string, the inside wall of the lateral wall of described sealed tube and described sealer is corresponding closely connected and be fixed;
C) from ground respectively to nitrogen injection described annular space, interior pipe, wherein, the nitrogen injecting described annular space enters oil reservoir on the upside of this through described first screen casing, annular space, and the nitrogen injecting described interior pipe enters oil reservoir on the downside of this by described second screen casing, lower annular space.
7. nitrogen flooding concentric layers steam injection method as claimed in claim 6; it is characterized in that; in step b) and step c) between; also comprise step b1): in the upper annular space formed between described outer tube tubing string and described pit shaft, inject pit shaft protect liquid, make described pit shaft protect liquid to be filled in the upside of described upper packer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410001417.XA CN103758496B (en) | 2014-01-02 | 2014-01-02 | Nitrogen flooding concentric layered steam injection pipe column and method |
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| CN201410001417.XA CN103758496B (en) | 2014-01-02 | 2014-01-02 | Nitrogen flooding concentric layered steam injection pipe column and method |
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| CN103758496B true CN103758496B (en) | 2016-04-06 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109424340A (en) * | 2017-09-01 | 2019-03-05 | 中国石油化工股份有限公司 | A method of note nitrogen exploits shallow-thin layer super-viscous oil |
| CN111502622A (en) * | 2019-01-30 | 2020-08-07 | 中国石油天然气股份有限公司 | Concentric layered steam drive pipe column structure and layered steam drive method thereof |
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| CN2931767Y (en) * | 2005-03-25 | 2007-08-08 | 黄立斌 | Production-injection integrated packer |
| CN102312667A (en) * | 2011-09-23 | 2012-01-11 | 中国石油天然气股份有限公司 | Concentric Tube Layered Steam Injection System and Method |
| CN203729960U (en) * | 2014-01-02 | 2014-07-23 | 中国石油天然气股份有限公司 | Nitrogen drives concentric layering steam injection tubular column |
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2014
- 2014-01-02 CN CN201410001417.XA patent/CN103758496B/en active Active
Patent Citations (7)
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| US5024274A (en) * | 1985-11-01 | 1991-06-18 | Otis Engineering Corp. | Method and apparatus for enhanced oil recovery |
| CN2585975Y (en) * | 2002-11-22 | 2003-11-12 | 中国石油天然气股份有限公司 | Oil well layered stable and constant steam injection device |
| CN2737941Y (en) * | 2004-10-14 | 2005-11-02 | 中国石化胜利油田有限公司采油工艺研究院 | Concentric tube separated layer gas injection tube column |
| CN2931767Y (en) * | 2005-03-25 | 2007-08-08 | 黄立斌 | Production-injection integrated packer |
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