CN104533381B - Gas-liquid separation device for drilling and grinding bridge plug flowback process of natural gas well - Google Patents
Gas-liquid separation device for drilling and grinding bridge plug flowback process of natural gas well Download PDFInfo
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- CN104533381B CN104533381B CN201410848548.1A CN201410848548A CN104533381B CN 104533381 B CN104533381 B CN 104533381B CN 201410848548 A CN201410848548 A CN 201410848548A CN 104533381 B CN104533381 B CN 104533381B
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- 239000007788 liquid Substances 0.000 title claims abstract description 72
- 238000000926 separation method Methods 0.000 title claims abstract description 35
- 239000002343 natural gas well Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000005553 drilling Methods 0.000 title abstract description 3
- 239000007789 gas Substances 0.000 claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 claims description 23
- 239000010959 steel Substances 0.000 claims description 23
- 238000004064 recycling Methods 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 11
- 239000002737 fuel gas Substances 0.000 claims description 10
- 241001074085 Scophthalmus aquosus Species 0.000 claims description 9
- 238000002485 combustion reaction Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 5
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 230000005484 gravity Effects 0.000 abstract description 4
- 238000001914 filtration Methods 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 30
- 239000003345 natural gas Substances 0.000 description 15
- 238000012360 testing method Methods 0.000 description 14
- 230000015572 biosynthetic process Effects 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000002245 particle Substances 0.000 description 6
- 238000007789 sealing Methods 0.000 description 6
- 239000004576 sand Substances 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000000694 effects 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
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000009466 transformation Effects 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
- E21B43/34—Arrangements for separating materials produced by the well
- E21B43/40—Separation associated with re-injection of separated materials
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- 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)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention provides a gas-liquid separation device for a drilling and grinding bridge plug flowback process of a natural gas well, which comprises a cylinder with two closed ends and a sieve tube arranged in the cylinder along the axial direction of the cylinder, wherein two ends of the sieve tube respectively extend out of the cylinder; a plurality of liquid discharge holes are formed in the wall of the cylinder; the pipe wall of the sieve pipe is provided with a plurality of small holes, and the radial central line of the small holes along the pipe wall is parallel to the radial central line of the liquid discharge hole along the cylinder wall. When the return gas-liquid is returned, the return gas-liquid is separated under the action of gravity, the flow of the ball valve and the filtering action of the small holes of the sieve tube, the liquid is dispersed in the cylinder in the form of rain flowers and flows into the recovery tank through the liquid discharge hole on the cylinder, and the gas is dispersed along with the liquid, so that the problems that the return gas-liquid is difficult to separate and the combustible gas is difficult to detect are solved. Ensure the safety of field operation and accord with the environmental protection regulations.
Description
Technical field
The invention belongs to gas field underground work field apparatus technical field, is auxiliary in gas well fracturing, gas testing operation process
Help one of equipment, and in particular to a kind of to bore the gas-liquid separation device that mill bridging plug returns drainage journey for the natural gas well.
Background technology
In the transformation of well compact reservoir is evaluated, " the sleeve pipe drilling type composite bridge plug separate stratum fracfturing usually using slim-hole 3-1/2
Technology, the effect of bridging plug is Oil/gas Well sealing, with working procedure is few, cycle is short, accurate card envelope position the characteristics of, be divided into permanent
Two kinds of formula bridging plug and detachable bridge plug：（1）Permanent type bridging plug is formed at the initial stage eighties, because its working procedure is few, cycle is short,
Card envelope position accurately, so being just widely applied in terms of Oil/gas Well sealing once coming out, is beaten before substantially instead of
The technology of cement plug sealing, becomes Pressure Curve in Oil Testing Well closure and has tried layer, carries out returning the main sealing technique of formation testing.In middle-shallow layer
The special layers positions such as dried layer, water layer, gas-bearing formation and the abnormal pressure occurred in formation testing construction, for convenience of follow-up formation testing, plugged and abandoned layer
Position, generally carries out sealing using such bridging plug, terminates well simultaneously for formation testing of the part short-term without development plan and is also adopted by forever
Formula bridging plug is shunt in a well.Additionally, the bridging plug be also used for deep gas well the layer of examination closure, be on return the technique skill such as test, fracturing reform
The successful implementation of art provides safeguard.（2）Detachable bridge plug is produced with the appearance of permanent type bridging plug, is formed at 80 years
In generation, as a kind of oil field down-hole plugging instrument, it is widely used in oil field prospecting and exploitation to oil-water well separate stratum fracfturing, layering
Acidifying, formation testing by layer block bottom well section when constructing.It preferably solve set, salvage, unsealing operation it is complicated, using success
The low problem of rate.Functionally part can substitute+packer, permanent type bridging plug and cement injecting closure of giving up, be it is a kind of it is safe and reliable,
With low cost, multiple functional down-hole plugging instrument.In middle-shallow layer formation testing construction, for packing abnormal pressure, high yield, span
The special layers positions such as big or inclined shaft, return formation testing in realization, the success rate of double sealed packer constructions is relatively low, for convenience of follow-up formation testing,
Formation testing one-time success rate is improved, generally sealing is carried out using such bridging plug.
Before gas well is gone into operation, rapid boring is needed to grind off bridging plug, and during mill bridging plug, gas lift liquid drainage is bored, will according to environmental protection
Ask, it is all return discharge opeing do not allow landing, it is necessary to collection enter recycling can, returning drainage journey end, if natural gas is returned out, gas
Body detector is difficult to detect natural gas, it is impossible to find that natural gas is returned out in time, and natural gas can together enter recycling can with liquid,
There is larger potential safety hazard, therefore, the mill bridging plug that bores in the urgent need to address returns drainage journey end gas-liquid separation hardly possible, is difficult asking for detection
Topic, research makes a kind of gas-liquid separation device that row's recovery process is returned suitable for boring mill composite bridge plug.
The content of the invention
It is an object of the invention to provide a kind of bore the gas-liquid separation device that mill bridging plug returns drainage journey for the natural gas well, solve
Bore mill bridging plug and return the problem that the gas-liquid separation of drainage journey end is difficult, be difficult detection.
For this purpose, the invention provides a kind of bore mill bridging plug and return the gas-liquid separation device of drainage journey for the natural gas well, including
The screen casing axially arranged along cylinder in the cylinder and cylinder of closed at both ends, the two ends of screen casing each extend over out the outside of cylinder,
One end of screen casing is connected with box cupling, and the box cupling is used to be connected with tapping line, the other end mounting ball valve of screen casing；
The barrel of the cylinder is provided with multiple outages；
The tube wall of the screen casing is provided with multiple apertures, and aperture along tube wall radial direction center line with outage along barrel footpath
To centerline parallel.
Described outage is equidistantly arranged along the barrel of cylinder, and aperture is equidistantly arranged along the tube wall of screen casing.
Described outage has three.
The diameter of the aperture is 4mm ~ 8mm.
The diameter of the aperture is 6.18mm.
Also include the support meanss being fixedly connected with the barrel of cylinder, the support meanss include being respectively fixedly connected with justifying
The V-type support of the barrel two ends bottom of cylinder, and the horizontal stand being fixedly connected with the bottom of V-type support.
Described horizontal stand by two with the horizontal steel plate of the centerline axis parallel of cylinder, be fixedly connected on horizontal steel plate
Two ends it is vertical with horizontal steel plate vertical steel plate composition；
The horizontal steel plate with vertical steel plate in same plane, with V-type support fix and connect by the upper surface of vertical steel plate
Connect.
Beneficial effects of the present invention：This is placed in back for the gas-liquid separation device that natural gas well brill mill bridging plug returns drainage journey
On closed cans, return exhaust liquid when returning exhaust liquid and returning out and divide under the aperture filtration of Action of Gravity Field, ball valve choked flow and screen casing
From liquid is distributed in cylinder in the form of rain flower, and flows into recycling can by the outage on cylinder, in the process for distributing
In, gas also flies away out therewith, solves the problem for returning that discharge opeing gas-liquid separation is difficult, is difficult to detect fuel gas.If any natural gas
Return out, be just easy to detection using gas detecting instrument by the gas-liquid separation device of drainage journey returning for natural gas well brill mill bridging plug
Go out fuel gas, find immediately switch flow process after fuel gas, control downstream pressure, make flowback liquid enter two-phase laminated flow
Device, carries out gas-liquid separation, and gas enters combustion cell burning, and liquid enters recycling can collection, it is ensured that field work safe.
The present invention is described in further details below with reference to accompanying drawing.
Description of the drawings
Fig. 1 is to bore the front view that mill bridging plug returns the gas-liquid separation device of drainage journey for the natural gas well.
Fig. 2 is to bore the upward view that mill bridging plug returns the gas-liquid separation device of drainage journey for the natural gas well.
Fig. 3 is to bore the side view that mill bridging plug returns the gas-liquid separation device of drainage journey for the natural gas well.
Fig. 4 is the schematic diagram of support meanss.
Fig. 5 is to bore the scheme of installation that mill bridging plug returns the gas-liquid separation device of drainage journey for the natural gas well.
Description of reference numerals：1st, cylinder；2nd, screen casing；3rd, box cupling；4th, ball valve；5th, outage；6th, aperture；7th, support meanss；
8th, V-type support；9th, horizontal stand；901st, horizontal steel plate；902nd, vertical steel plate；10th, well head；11st, SSV；12nd, desanding
Device；13rd, choke manifold；14th, two phase separator；15th, three phase separator；16th, recycling can；17th, combustion cell；18th, the first valve；
19th, the second valve；20th, the 3rd valve；21st, the 4th valve；22nd, the 5th valve；23rd, the 6th valve；24th, the 7th valve；25th,
Eight valves；26th, the 9th valve；27th, the tenth valve.
Specific embodiment
Further the natural gas well to be used for this below with reference to accompanying drawing and bore the gas-liquid separation device work that mill bridging plug returns drainage journey
Detailed description.
Embodiment 1：
The invention provides a kind of bore the gas-liquid separation device that mill bridging plug returns drainage journey for the natural gas well, as shown in Figure 1, Figure 2
With shown in Fig. 3, including the screen casing 2 axially arranged along cylinder 1 in the cylinder 1 and cylinder 1 of closed at both ends, the two ends point of screen casing 2
Do not extend the outside of cylinder 1, one end of screen casing 2 is connected with box cupling 3, the box cupling 3 is used to be connected with tapping line, screen casing 2
Other end mounting ball valve 4；The barrel of the cylinder 1 is provided with multiple outages 5；The tube wall of the screen casing 2 is provided with multiple little
Hole 6, and aperture 6 along tube wall radial direction center line and outage 5 along barrel radial direction centerline parallel.
First by gas detecting instrument, preferred U.S.'s English Cisco M40 four-in-one gas detecting instruments are detected for the natural gas well
Brill mill bridging plug is returned and whether have by the gas-liquid separation device of drainage journey fuel gas, such as without fuel gas, then selects brill mill bridging plug to return
Drainage journey, i.e. 10 → SSV of well head, 11 → desander, 12 → choke manifold, 13 → gas-liquid separation device → recycling can 16,
Specifically, as shown in figure 5, opening the first valve 18 and the second valve 19, other valve closings, the mixture in oil pipe is from well head
10 outputs, by SSV 11 desander 12 is reached, and is arranged the protection of desander 12 plant equipment and is exempted from abrasion, reduces weight
Deposit in pipeline, groove, and reduce because foreign particle is accumulated in a large number clearing times required in digester, in natural gas production
Arranging desander 12 can prevent formation sand production blocking pipeline or appliance arrangement, and desander 12 is by the big particle diameter contained in mixture
Impurity removal after, mixture is directly entered and bores the gas-liquid that mill bridging plug returns drainage journey for the natural gas well by choke manifold 13
Separator, this is used to the natural gas well and bores mill bridging plug and return the gas-liquid separation device of drainage journey be placed on recycling can 16, when the row of returning
When gas-liquid is returned out, return exhaust liquid enter screen casing 2, while return exhaust liquid on Action of Gravity Field, the choked flow of ball valve 4 and the tube wall of screen casing 2
The lattice gear effect of aperture 6 is lower to be separated, and liquid is distributed in cylinder 1 in the form of rain flower, and the outage 5 from cylinder 1 is flowed into
Recycling can 16, during distributing, gas also flies away out therewith, realizes gas-liquid separation, and reduces detection natural gas
Difficulty, while also ensure that the security of operation, and meets environmental regulations.
Have flammable by the gas-liquid separation device of drainage journey as gas detecting instrument detects to be returned for natural gas well brill mill bridging plug
Gas, that is, returning in exhaust liquid has natural gas to return out, then select discharge opeing flow process, i.e. 10 → SSV of well head, 11 → desander 12
13 → two phase separator of → choke manifold, 14 → natural gas to combustion cell 17 burns/and liquid collected to recycling can 16, specifically, such as
Shown in Fig. 5, the 7th valve 24, the 8th valve 25, the 9th valve 26 and the tenth valve 27, other valve closings, in oil pipe are opened
Mixture export from well head 10, by SSV 11 reach desander 12, arrange desander 12 protection plant equipment exempt from
Worn and torn, reduce weight and deposit in pipeline, groove, and reduced because foreign particle is accumulated in a large number cleaning required in digester time
Number, desander 12 is arranged in natural gas production can prevent formation sand production blocking pipeline or appliance arrangement, desander 12 from will mix
After the Impurity removal of the big particle diameter contained in thing, mixture, into two phase separator 14, is divided by choke manifold 13 by two-phase
Liquids and gases are separated from device 14, the natural gas isolated burns into combustion cell 17, and liquid is received into recycling can 16
Collection, it is ensured that discharge opeing safety.
In the production test stage in discharge opeing flow process latter stage, testing process, i.e. 10 → SSV of well head 11 → remove are selected
Sand device 12 → choke manifold, 13 → three phase separator, 15 → natural gas to combustion cell 17 burns/and liquid collected to recycling can 16, tool
Body, as shown in figure 5, the second valve 19, the 3rd valve 20, the 4th valve 21, the 5th valve 22 and the 6th valve 23 are opened, its
His valve closing, the mixture in oil pipe is exported from well head 10, and by SSV 11 desander 12 is reached, and arranges desander
12 protection plant equipment exempt from abrasion, reduce weight and deposit in pipeline, groove, and reduce because foreign particle is accumulated in a large number digestion
Required clearing times in pond, arranging desander 12 in natural gas production can prevent formation sand production blocking pipeline or device from setting
Standby, by after the Impurity removal of the big particle diameter contained in mixture, mixture passes through choke manifold 13 to desander 12, into three-phase separate
From device 15, liquids and gases are separated by three phase separator 15, the natural gas isolated burns into combustion cell 17, and liquid enters
Enter recycling can 16 to be collected, it is ensured that discharge opeing safety.
It should be strongly noted that when bridging plug chip blocks screen casing, can be in the connecting pipeline of ball valve 4 of screen casing end to it
Cleaning de-plugging is carried out, residue in collecting pipe.
Embodiment 2：
On the basis of embodiment 1, further, during in order that returning exhaust liquid and discharged by aperture 6 and outage 5, can
With uniform force, described outage 5 is equidistantly arranged along the barrel of cylinder 1, and aperture 6 is equidistantly arranged along the tube wall of screen casing 2,
And the spacing of aperture 6 is 100mm.
Embodiment 3：
On the basis of embodiment 2, it should be noted that described outage 5 has three, and preferably outage 5 is ellipse
Toroidal, specifically, oval major axis is 250mm, and short axle is 220mm.
Embodiment 4：
On the basis of embodiment 2, further, the diameter of the aperture 6 is 4mm ~ 8mm.
Embodiment 5：
On the basis of embodiment 4, specifically, the diameter of the aperture 6 is 6.18mm.
Embodiment 6：
On the basis of embodiment 1, as shown in Figure 3 and Figure 4, also include the support dress being fixedly connected with the barrel of cylinder 1
Put 7, the support meanss 7 include being respectively fixedly connected with the V-type support 8 in the barrel two ends bottom of cylinder 1, and with V-type support 8
The horizontal stand 9 that is fixedly connected of bottom.It is pointed out that support meanss 7 return drainage with for natural gas well brill mill bridging plug
The gas-liquid separation device of journey when using, will support that device is placed on recycling can 16 by being welded to connect, and make to return exhaust liquid from row
During fluid apertures 5 is discharged, distribute more thorough.
Embodiment 7：
On the basis of embodiment 6, specifically, described horizontal stand 9 by two with the centerline axis parallel of cylinder 1
Laterally steel plate 901, the two ends vertical steel plate 902 vertical with horizontal steel plate 901 that be fixedly connected on horizontal steel plate 901 are constituted；Institute
Horizontal steel plate 901 is stated with vertical steel plate 902 in same plane, the upper surface of vertical steel plate 902 is fixed with V-type support 8 and connected
Connect.
The gas-liquid separation device for returning drainage journey provided by the present invention for natural gas well brill mill bridging plug is placed on recycling can,
When return exhaust liquid return out when return exhaust liquid separate under the aperture filtration of Action of Gravity Field, ball valve choked flow and screen casing, liquid with
The form of rain flower is distributed in cylinder, and flows into recycling can by outage on cylinder, during distributing, gas also with
Fly away out, solve the problem for returning that discharge opeing gas-liquid separation is difficult, is difficult to detect fuel gas.Return out if any natural gas, be used for
Natural gas well brill mill bridging plug returns the gas-liquid separation device side of drainage journey and is just readily detected fuel gas using gas detecting instrument,
It was found that can immediately switch flow process after fuel gas, downstream pressure is controlled, make flowback liquid enter two phase separator, carry out gas-liquid point
From gas enters combustion cell burning, and liquid enters recycling can collection, it is ensured that field work safe, and meets environmental regulations.
Exemplified as above is only the illustration to the present invention, does not constitute the restriction to protection scope of the present invention, all
It is that design same or analogous with the present invention is belonged within protection scope of the present invention.Portion of the present embodiment without detailed narration
Part and structure belong to the well-known components and common structure or conventional means of the industry, do not describe one by one here.
Claims (5)
- It is 1. a kind of to bore the gas-liquid separation device that mill bridging plug returns drainage journey for the natural gas well, it is characterised in that：Including closed at both ends Cylinder（1）And cylinder（1）It is interior along cylinder（1）Axially arranged screen casing（2）, screen casing（2）Two ends each extend over out cylinder （1）Outside, screen casing（2）One end be connected with box cupling（3）, the box cupling（3）For being connected with tapping line, screen casing（2）It is another End mounting ball valve（4）；The cylinder（1）Barrel be provided with multiple outages（5）；The screen casing（2）Tube wall be provided with multiple apertures（6）, and aperture（6）Along the center line and outage of tube wall radial direction（5） Along the centerline parallel of barrel radial direction；Also include and cylinder（1）The support meanss that are fixedly connected of barrel（7）, the support meanss（7）Connect including fixed respectively It is connected on cylinder（1）Barrel two ends bottom V-type support（8）, and with V-type support（8）The horizontal stand that is fixedly connected of bottom （9）；Described horizontal stand（9）By two and cylinder（1）Centerline axis parallel horizontal steel plate（901）, be fixedly connected on Horizontal steel plate（901）Two ends and horizontal steel plate（901）Vertical vertical steel plate（902）Composition；The horizontal steel plate（901）With vertical steel plate（902）In same plane, vertical steel plate（902）Upper surface and V-type Support（8）It is fixedly connected；Just be easy to detection using gas detecting instrument by the gas-liquid separation device of drainage journey returning for natural gas well brill mill bridging plug Go out fuel gas, find immediately switch flow process after fuel gas, control downstream pressure, make flowback liquid enter two phase separator （14）, gas-liquid separation is carried out, gas enters combustion cell burning, and liquid enters recycling can（16）Collect, it is ensured that field work safe.
- 2. a kind of boring for the natural gas well as claimed in claim 1 grinds the gas-liquid separation device that bridging plug returns drainage journey, its feature It is：Described outage（5）Along cylinder（1）Barrel equidistantly arrange, aperture（6）Along screen casing（2）Tube wall equidistantly arrange Row.
- 3. a kind of boring for the natural gas well as claimed in claim 2 grinds the gas-liquid separation device that bridging plug returns drainage journey, its feature It is：Described outage（5）There are three.
- 4. a kind of boring for the natural gas well as claimed in claim 2 grinds the gas-liquid separation device that bridging plug returns drainage journey, its feature It is：The aperture（6）Diameter be 4mm ~ 8mm.
- 5. a kind of boring for the natural gas well as claimed in claim 4 grinds the gas-liquid separation device that bridging plug returns drainage journey, its feature It is：The aperture（6）Diameter be 6.18mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410848548.1A CN104533381B (en) | 2014-12-31 | 2014-12-31 | Gas-liquid separation device for drilling and grinding bridge plug flowback process of natural gas well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410848548.1A CN104533381B (en) | 2014-12-31 | 2014-12-31 | Gas-liquid separation device for drilling and grinding bridge plug flowback process of natural gas well |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104533381A CN104533381A (en) | 2015-04-22 |
| CN104533381B true CN104533381B (en) | 2017-05-10 |
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| CN201410848548.1A Active CN104533381B (en) | 2014-12-31 | 2014-12-31 | Gas-liquid separation device for drilling and grinding bridge plug flowback process of natural gas well |
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| CN203484002U (en) * | 2013-09-24 | 2014-03-19 | 中联煤层气有限责任公司 | Coalescent filter and filter element |
| CN203549818U (en) * | 2013-11-16 | 2014-04-16 | 中国石油化工股份有限公司 | Combustion cylinder with gas-liquid separation function |
| CN204419156U (en) * | 2014-12-31 | 2015-06-24 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Gas-liquid separation device for drilling and grinding bridge plug flowback process of natural gas well |
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| Publication number | Publication date |
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| CN104533381A (en) | 2015-04-22 |
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Effective date of registration: 20211029 Address after: 100007 Oil Mansion, 9 North Avenue, Dongcheng District, Beijing, Dongzhimen Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC CHUANQING DRILLING ENGINEERING Co.,Ltd. Address before: 710018 room 1207, Changqing building, Changqing Xing Long Yuan District, Xi'an, Shaanxi Patentee before: CHINA NATIONAL PETROLEUM CORPORATION CHUANQING DRILLING ENGINEERING COMPANY LIMITED CHANGQING DOWNHOLE TECHNOLOGY Co. Patentee before: CNPC CHUANQING DRILLING ENGINEERING Co.,Ltd. |
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