CN102913209A - Method for building sieve-tube artificial natural gas migration passage between gas reservoirs - Google Patents
Method for building sieve-tube artificial natural gas migration passage between gas reservoirs Download PDFInfo
- Publication number
- CN102913209A CN102913209A CN2012104303004A CN201210430300A CN102913209A CN 102913209 A CN102913209 A CN 102913209A CN 2012104303004 A CN2012104303004 A CN 2012104303004A CN 201210430300 A CN201210430300 A CN 201210430300A CN 102913209 A CN102913209 A CN 102913209A
- Authority
- CN
- China
- Prior art keywords
- gas
- gas reservoir
- reservoir
- developed
- well
- 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
Images
Landscapes
- Earth Drilling (AREA)
Abstract
The invention discloses a method for building a sieve-tube artificial natural gas migration passage between gas reservoirs, and the method comprises the following steps of building a construction well, to be specific locating a drilling ship on an appropriate sea position in place according to a spatial relationship between a selected gas reservoir to be developed and a production gas reservoir of a developed gas field, and drilling to the sea bed to forming the construction well; conducting well drilling inside the construction well, and forming an uncased hole between the selected gas reservoir to be developed and the production gas reservoir of the developed gas field; loading a sieve tube into the uncased hole on the two gas reservoir well sections; and setting a bridge plug above or in front of the two gas reservoir sieve tube loaded well sections inside the uncased hole, i.e. forming the sieve-tube artificial migration passage between the gas reservoirs. By adopting the development method, the sieve-tube artificial natural gas migration passage is conveniently built between the reservoir sand of the production gas reservoir of the developed gas field and the selected gas reservoir to be developed, and the economy and efficiency in development of the gas reservoir to be developed inside or surrounding the offshore developed gas field.
Description
Technical field
The present invention relates to a kind of method of the construction of natural gas fields, specifically a kind of method of between gas reservoir, setting up sieve tube type artificial natural gas migration pathway.
Background technologyDeveloped the gas field in the THE WESTERN SOUTH CHINA SEA marine site inner or on every side, has a lot of small-scale gas reservoirs, Abnormal High Pressure Gas Reservoirs, low permeability gas reservoir and height to contain CO
2Gas reservoir not yet drops into exploitation, and its overall reserves are on a grand scale.Because in the selected above-mentioned four kinds of gas reservoirs to be developed of the present invention, but the gas reservoir development gas production reaches less that marine to bore the completion investment relatively high on a small scale; The high and low infiltration gas reservoir development of Abnormal High Pressure Gas Reservoirs exploitation safety requirements grade production capacity is low need many well-diggings and to reservoir transform, height contains CO
2Gas reservoir development requirement for anticorrosion height and pure hydrocarbon yield poorly, and the marine completion of boring is invested higher; If increase further increase investment of underwater well head at existing offshore production platform external hanging drilling slot or at existing marine subsea production system; And newly-built offshore production platform or subsea production system construction investment are higher, thereby cause above-mentioned four kinds of marine gas reservoir development deficiencies in economic performance or be difficult to economic development.
At present contain CO for the selected small-scale gas reservoir to be developed in sea or Abnormal High Pressure Gas Reservoirs or low permeability gas reservoir or height
2The development approach of gas reservoir is identical with the Determing The Length gas field, namely all adopts conventional offshore production platform exploitation or subsea production system exploitation.Mainly be that at sea production platform or subsea production system bore development well and directly open selected small-scale gas reservoir to be developed or Abnormal High Pressure Gas Reservoirs or low permeability gas reservoir or height and contain CO
2Gas reservoir, selected small-scale gas reservoir to be developed or Abnormal High Pressure Gas Reservoirs or low permeability gas reservoir or height contain CO
2The gas reservoir natural gas contains CO from selected small-scale gas reservoir to be developed or Abnormal High Pressure Gas Reservoirs or low permeability gas reservoir or height under the effect of expansion energy
2Gas reservoir flows to the producing pattern that bores, and passes through the directly extraction of flow string quilt of each producing well.In addition, if will to producing the gas reservoir makeup energy, then also need to bore special Injection Well.
Contain CO for the selected small-scale gas reservoir to be developed in sea or Abnormal High Pressure Gas Reservoirs or low permeability gas reservoir or height
2Gas reservoir, there is following shortcoming in existing gas reservoir development method:
1) newly-built production platform or subsea production system drilling well exploitation, be built into from new production platform or subsea production system and put into production, cycle is long, investment is large, be difficult to realize to the sea developed in the gas field or around it selected small-scale gas reservoir to be developed or Abnormal High Pressure Gas Reservoirs or low permeability gas reservoir or height contain CO
2The economical and effective exploitation of gas reservoir also will cause existing well pattern and the existing production facility of having developed gas field production platform or subsea production system to utilize simultaneously.
2) develop the gas field production platform without residue well slot or subsea production system without the residue underwater well head, also can't adding and hanging well slots or increase underwater well head, or directly develop in the situation that can't realize because of reasons such as economy, technology from built production platform or subsea production system drilling well, selected small-scale gas reservoir to be developed or Abnormal High Pressure Gas Reservoirs or low permeability gas reservoir or height contain CO
2The reserves of gas reservoir can't be employed, and the natural gas resource of national precious will be wasted.
3) developed gas field production platform or subsea production system whether can be used for developing in it or around it selected small-scale gas reservoir to be developed or Abnormal High Pressure Gas Reservoirs or low permeability gas reservoir or height contain CO
2Gas reservoir is subjected to the drillng operation capabilities limits of relative position and the offshore boring island of the former with the latter.
4) Abnormal High Pressure Gas Reservoirs exploitation and height contain CO
2Gas reservoir development is all very high to pressure security class requirement and the requirement for anticorrosion of relevant materials, causes and bores completion and significantly increase of production facility investment, has a strong impact on economic benefit.
Summary of the invention
In order to overcome above-mentioned deficiency, the object of the invention is to provide the method for setting up sieve tube type artificial natural gas migration pathway between a kind of convenience and high-efficiency, the widely used gas reservoir.
To achieve these goals, the technical solution used in the present invention is as follows:
Set up the method for sieve tube type artificial natural gas migration pathway between the gas reservoir, comprise the following steps:
1) at sea developed in the gas field development early stage, selecting in the gas field sandstone reservoir physical property to belong to middle and high infiltration is permeability ﹥ 10mD and the more stable production gas reservoir that distributes, simultaneously produce the sandstone reservoir spatial distribution scope of gas reservoir and the drilling duty of drill ship in conjunction with this, developing in the gas field or selecting to be fit to the small-scale gas reservoir of the present invention's exploitation around it or Abnormal High Pressure Gas Reservoirs or low permeability gas reservoir or height contain CO
2Gas reservoir;
2) contain CO according to above-mentioned selected small-scale gas reservoir to be developed or Abnormal High Pressure Gas Reservoirs or low permeability gas reservoir or height
2Gas reservoir and the spatial relationship of developing gas field production gas reservoir, at sea suitable ground location drill ship in place forms the construction well;
3) utilize the construction well, contain CO at selected small-scale gas reservoir to be developed or Abnormal High Pressure Gas Reservoirs or low permeability gas reservoir or height
2Gas reservoir and developed between the sandstone reservoir that the gas field produces gas reservoir and bored bore hole;
4) then in bore hole two gas reservoir well sections be lowered to screen casing;
5) in bore hole on the two gas reservoir screen insertion well sections or before beat bridging plug and carry out packing, namely between two gas reservoirs, set up the artificial migration pathway of sieve tube type.
Repeating step 3), 4) and 5), setting up a plurality of sieve tube type artificial natural gas migration pathways in construction in the well.
After described step 4) is finished, the working solution of two gas reservoir screen insertion well sections in the bore hole can be discharged.
Beneficial effect of the present invention: the applications expanding of the inventive method the sea developed in the gas field or its around gas reservoir or Abnormal High Pressure Gas Reservoirs or low permeability gas reservoir or height contain CO on a small scale
2The development approach of gas reservoir because greatly having reduced development cost, can make marine developed or small-scale gas reservoir that it can not employ because of reasons such as economy, technology in the past or Abnormal High Pressure Gas Reservoirs or low permeability gas reservoir or height contain CO on every side in the gas field in
2Gas reservoir is achieved successfully effective exploitation, simultaneously the natural gas resource of national precious is fully utilized, and can improve simultaneously the marine economic benefit of having developed the gas field.Its beneficial effect is embodied in following several respects:
1) can not be subjected to develop the restriction of gas field production platform or subsea production system position, by suitable ground location drill ship in place and drilling well, contain CO developing gas field production Gas Reservoir sand body and selected small-scale gas reservoir to be developed or Abnormal High Pressure Gas Reservoirs or low permeability gas reservoir or height at sea
2Set up sieve tube type artificial natural gas migration pathway between the gas reservoir, both can be and produced the gas reservoir makeup energy, saved to increase and bore that the required investment of facility and operation cost are injected in Injection Well and corresponding ground thereof, the gas reservoir economic recovery is produced in raising, can realize again to the sea developed in the gas field or around it selected small-scale gas reservoir to be developed or Abnormal High Pressure Gas Reservoirs or low permeability gas reservoir or height contain CO
2The economical and effective exploitation of gas reservoir.
2) need not can reduce drill ship in place and drillng operation difficulty and risk from production platform or subsea production system drilling well, reduce simultaneously drilling cost.
3) can take full advantage of and developed the existing well pattern that gas field production platform or subsea production system are produced gas reservoir, the above well section of sieve tube type artificial natural gas migration pathway bridging plug need not completion, can reduce completion period, the reduction Completion cost.
4) take full advantage of the existing production facility of developing gas field production platform or subsea production system, can save development investment.
5) adopt sieve tube type artificial natural gas migration pathway, can realize relying on the sea to develop gas field production platform or the marine on a small scale gas reservoir of subsea production system exploitation or Abnormal High Pressure Gas Reservoirs or low permeability gas reservoir or height and contain CO
2Gas reservoir neither needs production platform residue well slot and adding and hanging well slots, does not also need subsea production system residue underwater well head or increase underwater well head, does not more need newly-built production platform or subsea production system, can reduce greatly development investment and increase economic efficiency.
Description of drawings
The present invention is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is the structural representation that the present invention develops;
Fig. 2 is the schematic diagram of sieve tube type artificial natural gas migration pathway shown in Figure 1.
Among the figure: 1, selected gas reservoir to be developed; 2, sieve tube type artificial natural gas migration pathway; 3, bridging plug; 4, develop the gas field and produced gas reservoir; 5, construction well; 6, Multilateral Wells; 7, producing well; 8, production platform; 9, drill ship; 10, sea; 11, bore hole; 12, screen casing.
The specific embodiment
As shown in Figure 1, set up the method for sieve tube type artificial natural gas migration pathway between the gas reservoir, comprise the following steps:
1) at sea developed in the gas field development early stage, selecting in the gas field sandstone reservoir physical property to belong to middle and high infiltration is permeability ﹥ 10mD and the more stable production gas reservoir 4 that distributes, while is produced the sandstone reservoir spatial distribution scope of gas reservoir 4 and the drilling duty of drill ship 9 in conjunction with this, and namely gas reservoir or Abnormal High Pressure Gas Reservoirs or low permeability gas reservoir or height contain CO on a small scale at the selected gas reservoir to be developed 1 of developing in the gas field or select suitable the present invention to develop around it
2Gas reservoir;
2) namely gas reservoir or Abnormal High Pressure Gas Reservoirs or low permeability gas reservoir or height contain CO on a small scale according to above-mentioned selected gas reservoir to be developed 1
2Gas reservoir and the spatial relationship of developing gas field production gas reservoir 4, at sea suitable ground location 10 drill ships 9 in place form construction well 5;
3) as shown in Figure 2, utilize construction well 5, namely gas reservoir or Abnormal High Pressure Gas Reservoirs or low permeability gas reservoir or height contain CO on a small scale at selected gas reservoir to be developed 1
2Gas reservoir and developed between the sandstone reservoir that the gas field produces gas reservoir 4 and bored bore hole 11, then two gas reservoir well sections are lowered to screen casing 12 in bore hole 11, can substitute screen casing 12 with blind pipe in the mud stone well section of two gas reservoir well sections in case of necessity;
4) working solution of two gas reservoir screen insertion well sections in the bore hole 11 can be discharged in case of necessity;
5) in bore hole 11 on the two gas reservoir screen insertion well sections or before beat bridging plug 3 and carry out packing, namely between two gas reservoirs, set up the artificial migration pathway 2 of sieve tube type.
6) in case of necessity in the non-wiping situation of drill ship, in construction well 5, can set up a plurality of Multilateral Wells 6, utilize a plurality of Multilateral Wells 6 to bore a plurality of bore holes 11, a plurality of bore holes 11 will develop gas field production gas reservoir 4 or namely gas reservoir or Abnormal High Pressure Gas Reservoirs or low permeability gas reservoir or height contain CO on a small scale with gas reservoir same to be developed 1 of selecting around it
2The different parts of gas reservoir communicates or namely gas reservoir or Abnormal High Pressure Gas Reservoirs or low permeability gas reservoir or height contain CO on a small scale with other a plurality of gas reservoirs 1 to be developed of selecting around it
2Gas reservoir communicates, and two gas reservoir well sections are lowered to screen casing 12 in each bore hole 11, can substitute screen casing 12 with blind pipe in the mud stone well section of two gas reservoir well sections in case of necessity, and the working solution of two gas reservoir screen insertion well sections in the bore hole 11 can be discharged; In each bore hole 11 on the two gas reservoir screen insertion well sections or before beat bridging plug 3 and carry out packing, namely produce between gas reservoir 4 and each selected gas reservoir to be developed 1 and set up the artificial migration pathway 2 of a plurality of sieve tube types developing the gas field, and discarded construction well 5 and each Multilateral Wells 6.
7) in case of necessity, it is in place that drill ship can move on to new correct position, sets up new sieve tube type artificial natural gas migration pathway 2 by above-mentioned steps.
Among the present invention:
The small-scale gas reservoir: refer to the gas reservoir of gas pool reserve small scale, its recoverable reserves is 2.5 hundred million sides～2,500,000,000 sides only.
Abnormal High Pressure Gas Reservoirs: refer to that gas reservoir pressure is higher than hydrostatic pressure, and pressure coefficient is greater than 1.2 gas reservoir.
Low permeability gas reservoir: refer to reservoir properties poor be permeability ﹤ 10 * 10
-3U ㎡, utilize conventional mining type to be difficult to the gas reservoir of effective scale exploitation.
Height contains CO
2Gas reservoir: refer to CO in the natural gas
2The gas reservoir of content ﹥ 50%.
Screen casing: refer in the present invention comprise that general screen casing, high-quality screen casing, calking or cutting seam sieve tube, wire-wrapped screen and restraining liner etc. have the sand control pipe of hole, seam.
Production platform: in the offshore oil and gas field Development and Production, carry out the platform of oil and gas gathering, separation and preliminary treatment.
Subsea production system: refer to substantially be formed by production tree, well head and manifold, control system, control cable, ROV/ROT etc. by the whole series such as underwater well head offshore oil and gas production system of forming of production equipment and seabed pipeline under water.
Drill ship: be provided with drilling equipment, can under mooring location or dynamic positioning state, carry out the ship of Offshore Operation.
The above is preferred embodiment of the present invention, certainly can not limit with this interest field of the present invention.Should be pointed out that for those skilled in the art, technical scheme of the present invention is made amendment or is equal to replacement, do not break away from protection scope of the present invention.
Claims (4)
1. set up the method for sieve tube type artificial natural gas migration pathway between the gas reservoir, it is characterized in that, comprise the following steps:
1) at sea developed in the gas field development early stage, selecting in the gas field sandstone reservoir physical property to belong to middle and high infiltration is permeability ﹥ 10mD and the more stable production gas reservoir that distributes, simultaneously produce the sandstone reservoir spatial distribution scope of gas reservoir and the drilling duty of drill ship in conjunction with this, developing in the gas field or selecting to be fit to the small-scale gas reservoir of the present invention's exploitation around it or Abnormal High Pressure Gas Reservoirs or low permeability gas reservoir or height contain CO
2Gas reservoir;
2) contain CO according to above-mentioned selected small-scale gas reservoir to be developed or Abnormal High Pressure Gas Reservoirs or low permeability gas reservoir or height
2Gas reservoir and the spatial relationship of developing gas field production gas reservoir, at sea suitable ground location drill ship in place forms the construction well;
3) utilize the construction well, contain CO at selected small-scale gas reservoir to be developed or Abnormal High Pressure Gas Reservoirs or low permeability gas reservoir or height
2Gas reservoir and developed between the sandstone reservoir that the gas field produces gas reservoir and bored bore hole;
4) then in bore hole two gas reservoir well sections be lowered to screen casing;
5) in bore hole on the two gas reservoir screen insertion well sections or before beat bridging plug and carry out packing, namely between two gas reservoirs, set up the artificial migration pathway of sieve tube type.
2. set up the method for sieve tube type artificial natural gas migration pathway between the gas reservoir according to claim 1, it is characterized in that: repeating said steps 3), 4) and 5), setting up a plurality of sieve tube type artificial natural gas migration pathways in construction in the well.
3. set up the method for sieve tube type artificial natural gas migration pathway between the gas reservoir according to claim 1, it is characterized in that: after described step 4) is finished, the working solution of two gas reservoir screen insertion well sections in the bore hole can be discharged.
4. set up the method for sieve tube type artificial natural gas migration pathway between the gas reservoir according to claim 1, it is characterized in that: described screen casing adopts cutting seam sieve tube or punched hole screen pipe or wire-wrapped screen or high-quality screen casing or restraining liner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104303004A CN102913209A (en) | 2012-11-01 | 2012-11-01 | Method for building sieve-tube artificial natural gas migration passage between gas reservoirs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104303004A CN102913209A (en) | 2012-11-01 | 2012-11-01 | Method for building sieve-tube artificial natural gas migration passage between gas reservoirs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102913209A true CN102913209A (en) | 2013-02-06 |
Family
ID=47611752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012104303004A Pending CN102913209A (en) | 2012-11-01 | 2012-11-01 | Method for building sieve-tube artificial natural gas migration passage between gas reservoirs |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102913209A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112343555A (en) * | 2020-11-24 | 2021-02-09 | 中国海洋石油集团有限公司 | Relay well development method for expanding offshore oil and gas reserve utilization range |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1143992A (en) * | 1994-03-10 | 1997-02-26 | 国际壳牌研究有限公司 | Method of producing fluid from earth formation |
| CN1217041A (en) * | 1996-03-12 | 1999-05-19 | 特杰·马格纳森 | Underwater installation and method for building same |
| WO2005003509A1 (en) * | 2003-06-30 | 2005-01-13 | Petroleo Brasileiro S A-Petrobras | Method for, and the construction of, a long-distance well for the production, transport, storage and exploitation of mineral layers and fluids |
| RU2271442C2 (en) * | 2003-12-26 | 2006-03-10 | Открытое акционерное общество "Промгаз" | Gas-hydrate recovery method |
| CN101135240A (en) * | 2007-09-04 | 2008-03-05 | 中国科学院武汉岩土力学研究所 | Fluctuation displacement gas deposit dislodging method |
| GB2463187A (en) * | 2007-03-13 | 2010-03-10 | Schlumberger Holdings | A method of deploying a completion system into a multilateral well |
| CN102434129A (en) * | 2011-12-24 | 2012-05-02 | 大连理工大学 | Ultra-deepwater offshore oil-gas engineering developing system and mounting method thereof |
-
2012
- 2012-11-01 CN CN2012104303004A patent/CN102913209A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1143992A (en) * | 1994-03-10 | 1997-02-26 | 国际壳牌研究有限公司 | Method of producing fluid from earth formation |
| CN1217041A (en) * | 1996-03-12 | 1999-05-19 | 特杰·马格纳森 | Underwater installation and method for building same |
| WO2005003509A1 (en) * | 2003-06-30 | 2005-01-13 | Petroleo Brasileiro S A-Petrobras | Method for, and the construction of, a long-distance well for the production, transport, storage and exploitation of mineral layers and fluids |
| RU2271442C2 (en) * | 2003-12-26 | 2006-03-10 | Открытое акционерное общество "Промгаз" | Gas-hydrate recovery method |
| GB2463187A (en) * | 2007-03-13 | 2010-03-10 | Schlumberger Holdings | A method of deploying a completion system into a multilateral well |
| CN101135240A (en) * | 2007-09-04 | 2008-03-05 | 中国科学院武汉岩土力学研究所 | Fluctuation displacement gas deposit dislodging method |
| CN102434129A (en) * | 2011-12-24 | 2012-05-02 | 大连理工大学 | Ultra-deepwater offshore oil-gas engineering developing system and mounting method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112343555A (en) * | 2020-11-24 | 2021-02-09 | 中国海洋石油集团有限公司 | Relay well development method for expanding offshore oil and gas reserve utilization range |
| CN112343555B (en) * | 2020-11-24 | 2022-11-18 | 中国海洋石油集团有限公司 | Relay well development method for expanding offshore oil and gas reserve utilization range |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110397428B (en) | Displacement coalbed methane yield increasing method for coalbed methane jointly mined by vertical well and U-shaped butt well | |
| CN113738317A (en) | Method for combined exploitation of deep coal bed gas and dry hot rock type geothermal | |
| CN104806217A (en) | Combined separated layer fracturing, grouping and layer-combining mining method for coal bed well group | |
| CN104963671B (en) | A kind of fracturing reform method of High angle from formula well reservoir | |
| CN105822276B (en) | Interval while water injection oil extraction method between multistage fracturing horizontal well seam | |
| CN101956544B (en) | Method for oil extraction in multi-bottom and multi-branch well by artesian injection | |
| CN102392677A (en) | Permeability improvement technology for coal bed gas reservoir cap by using three-dimensional fracture network modification | |
| CN106761612B (en) | The asynchronous water injection oil extraction method of double different wells of pressure break horizontal well of zip mode cloth seam | |
| CN106761606A (en) | The asynchronous note CO of different well of symmetrical expression cloth seam2Oil production method | |
| CN107620581B (en) | Construction method of one-well dual-purpose coal mine shaft inspection hole | |
| CN110306965A (en) | A kind of method for increasing for coal bed gas low yield wellblock | |
| CN114135265B (en) | Low-cost and high-efficiency transformation process method for low-permeability reservoir of offshore oil field | |
| CN111594130B (en) | Method for integrated periodical production of encryption adjustment of pressure, injection and extraction | |
| CN102434192A (en) | Device and method for enhancing coal seam fracturing effect | |
| CN102913203B (en) | Method for developing low-permeability gas reservoir | |
| CN111734359A (en) | Natural gas hydrate horizontal branch well exploitation method based on deepwater suction anchor | |
| CN115182713B (en) | Three-dimensional development method for explosive-tight cutting of shale reservoir three-dimensional horizontal well | |
| CN102913206B (en) | Method for building bushing perforation fracturing-type artificial natural gas migration passage between gas reservoirs | |
| CN102913208B (en) | Method for building bushing inner-sieve-tube artificial natural gas migration passage between gas reservoirs | |
| RU2379492C2 (en) | Development method at wells re-entry and oil field in general | |
| CN102913209A (en) | Method for building sieve-tube artificial natural gas migration passage between gas reservoirs | |
| CN102913204B (en) | Method for building sieve-tube outer gravel-filled natural gas migration passage between gas reservoirs | |
| CN102900403B (en) | Method for establishing artificial natural gas migration channel between gas reservoirs | |
| CN102900401B (en) | Method for building sleeve perforating manmade natural gas migration channels between gas pools | |
| CN102913207B (en) | Method for building inner sieve-tube outer gravel-filled artificial natural gas migration passage |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20130206 |