CN106499368B - A kind of deep seafloor surface layer gas hydrate mining methods - Google Patents
A kind of deep seafloor surface layer gas hydrate mining methods Download PDFInfo
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- CN106499368B CN106499368B CN201610946867.5A CN201610946867A CN106499368B CN 106499368 B CN106499368 B CN 106499368B CN 201610946867 A CN201610946867 A CN 201610946867A CN 106499368 B CN106499368 B CN 106499368B
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- well
- conduit
- injection
- wellbore
- coiled tubing
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0099—Equipment or details not covered by groups E21B15/00 - E21B40/00 specially adapted for drilling for or production of natural hydrate or clathrate gas reservoirs; Drilling through or monitoring of formations containing gas hydrates or clathrates
Abstract
The present invention relates to a kind of deep seafloor surface layer gas hydrate mining methods, comprising the following steps: S1, injection catheter drilling well；S2, connection wellhead assembly and completion practice: christmas tree is transferred by standpipe to seabed, and with submarine well is oral is attached, coiled tubing carries jetting tool and enters inside pit shaft, injection high speed takes sand flow body inside to coiled tubing, the erosion of conduit is acted on by sand and forms aperture on conduit, the communicating passage on pit shaft and stratum is established, after completing abrasive perforating, completion tool is fetched and withdraws coiled tubing；S3, note chemical reagent heating；S4, production gas hydrates: after gas hydrate dissociation in rock stratum seepage flow, enter under differential pressure action around in producing well wellbore, gathering system uniformly passes through production riser and is delivered to production platform, completes the production work of gas hydrates.The present invention has the advantages that it is safe and reliable, efficiency of breaking rock is high, operation is simple, be suitable for the non-diagenesis region exploitation of gas hydrates in seabed.
Description
Technical field
The present invention relates to natural gas extraction technical fields, especially a kind of deep seafloor surface layer exploitation of gas hydrates side
Method.
Background technique
Gas hydrates have the advantages that energy density is high, resource reserve is big, and the exploration and exploitation of hydrate have become
The research hotspot of scientific circles.The non-diagenesis hydrate in seabed existing in the form of particulate crack type, dispersing type accounts for whole hydration goods and materials
The features such as 80% or more of source, buried depth is shallow, cementing properties is poor, prevents it from carrying out mining operations by conventional method.
Existing sea-bottom natural gas exploitation mostly uses greatly heat exploitation, decompression exploitation, chemical injection exploitation, CO2Replacement exploitation
Deng conventional recovery method, but all there is exploitation effect in the exploitation of diagenesis hydrate layer non-for seabed, these conventional recovery methods
The disadvantages of rate is low, difficulty is big, at high cost because seabed it is non-at rock stratum be mostly submarine surface formed tens to 100 meters of length
Wellbore, using normal recovery method can not deflecting, cause production zone to be restricted.In addition, sea-bottom shallow stratum is unstable,
Stratum is soft, shakes in recovery process and larger stratum is be easy to cause to collapse.
Summary of the invention
The purpose of the present invention is to overcome the shortcomings of the existing technology, provides safe and reliable one kind, efficiency of breaking rock height, operation letter
Single deep seafloor surface layer gas hydrate mining methods are suitable for the non-diagenesis region exploitation of gas hydrates in seabed.
The purpose of the present invention is achieved through the following technical solutions: a kind of deep seafloor surface layer exploitation of gas hydrates side
Method, comprising the following steps:
S1, injection catheter drilling well: the depth of stratum for being designed conduit tripping in using injection catheter drilling technology utilizes drill bit
The gravity aperture of water jet and conduit and drilling tool itself is sprayed, drill bit bottom connects mud motor, and the injection of drill bit side is opened
Hole edge tripping in, sheathed catheter, with drill bit and drilling tool tripping in, respectively obtain producing well and injection well outside drill bit and drilling tool；
S2, connection wellhead assembly and completion practice: after conduit tripping in projected depth, christmas tree is transferred by standpipe to sea
Bottom, and the well head head with the producing well in seabed and injection well is attached respectively, coiled tubing carries jetting tool and enters pit shaft
Inside, to coiled tubing inside injection high speed take sand flow body, the erosion of conduit is acted on by sand and forms aperture on conduit, is built
The communicating passage of vertical cylinder and stratum fetches completion tool and withdraws coiled tubing after completing abrasive perforating；
S3, note chemical reagent heating: injection well wellbore is connected to production platform by standpipe, and coiled tubing is passed through standpipe
Enter in injection well wellbore from production platform, chemical heating agent is injected inside coiled tubing, heats injection well wellbore rock
Layer, makes the gas hydrate dissociation around injection well；
S4, production gas hydrates: after gas hydrate dissociation in rock stratum seepage flow, under differential pressure action enter week
It encloses in producing well wellbore, into after wellbore, continues under differential pressure action, flow up, gas transmission line produces producing well wellbore
Natural gas be collected to gathering system in seabed, gathering system uniformly passes through production riser and is delivered to production platform, completes natural
The production work of gas hydrate.
The conduit tripping in depth of stratum is within 200 meters.
The wellbore conduit sandblasting operation hole of the injection well is formed in wellbore bottom, the conduit spraying operation of the producing well
Hole is formed in bottom to pit shaft medium position.
The producing well is at least three, and is distributed at equal intervals around injection well.
The invention has the following advantages that
1, the present invention is suitable for the exploitation of gas hydrates within tens meters to 100 meters of submarine surface, is led by injection
The depth of stratum that pipe drilling technology uses spray regime to design conduit tripping in, will not collapse because stratum is soft, can effectively keep away
Exempt from the generation of related accidents, securely and reliably.
2, using the gravity aperture of drill bit injection water jet and conduit and drilling tool itself, under drill bit is when spraying aperture
Enter, sheathed catheter is outside drill bit and drilling tool, and with drill bit and drilling tool tripping in, drill bit bottom connects mud motor, Neng Gouti
The efficiency of breaking rock of high drill bit.
3, the present invention uses drilling tool aperture, while conduit tripping in is designed depth of stratum, utilizes injection catheter drilling technology
Injection well with small holes and producing well are respectively obtained, wherein injection well wellbore conduit sandblasting operation hole is formed in wellbore bottom,
Producing well conduit spraying operation hole is formed in bottom to pit shaft medium position, when exploitation, injects chemical heating agent to injection well, changes
It learns heating agent to flow out from the operation hole of injection bottom, makes surrounding gas hydrate dissociation, and seepage flow is to producing well,
Under differential pressure action, into producing well, production platform is delivered to by gathering system, entire recovery process operation is simple.
Detailed description of the invention
Fig. 1 is the schematic diagram of tripping in conduit of the present invention；
Fig. 2 is stratum partial schematic diagram below in Fig. 1；
Fig. 3 is the schematic diagram that the present invention passes through sandblasting operation aperture；
Fig. 4 is mining system structural schematic diagram of the invention；
In figure: 1- production platform, 2- conduit, 3- drill bit, 4- mud motor, 5- standpipe, 6- well head head, 7- are continuously oily
Pipe, 8- jetting tool, 9- injection well, 10- producing well, 11- gas transmission line, 12- gathering system.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing, but protection scope of the present invention is not limited to following institute
It states.
A kind of deep seafloor surface layer gas hydrate mining methods, comprising the following steps:
S1, injection catheter drilling well: as depicted in figs. 1 and 2,2 tripping in of conduit is designed using injection catheter drilling technology
Depth of stratum, 2 tripping in depth of stratum of conduit spray water jet and conduit 2 and drilling tool itself within 200 meters, using drill bit
Gravity aperture, 3 bottom of drill bit connect mud motor 4, and the tripping in when spraying aperture of drill bit 3,2 sets of conduit in drill bit and drilling tool
Outside respectively obtains producing well 10 and injection well 9 with drill bit and drilling tool tripping in, below injection catheter to mud line when 20m, bores
Voltage-controlled system is in 138~180kN, if range of the bit pressure beyond design, just reduces injection catheter bit speed, increases discharge capacity and replaces
Enter thick bentonite slurry cleaning or up and down conduit 2, until bit pressure is rear in the range of design to continue injection catheter drilling well,
For injection catheter drilling well, conduit finally in place when bit pressure it is particularly significant, cannot be below the 80% of maximum bit pressure, both may be used
The pipe string full payload for bending, and conduit 2 may make to can bear that is excessively pressurized is avoided to tend to be maximum；
S2, connection wellhead assembly and completion practice: as shown in Figure 3 and Figure 4, after 2 tripping in projected depth of conduit, christmas tree is logical
It crosses standpipe 5 to transfer to seabed, and the well head head 6 with the producing well 10 in seabed and injection well 9 is attached respectively, coiled tubing 7
Carry jetting tool 8 enter pit shaft inside, to coiled tubing 7 inside injection high speed take sand flow body, the erosion by sand to conduit 2
It acts on conduit 2 and forms aperture, the christmas tree includes injection well 9 and producing well 10, wherein 9 wellbore conduit sandblasting of injection well
Operation hole is formed in wellbore bottom, and 10 conduit spraying operation hole of producing well is formed in bottom to pit shaft medium position, the production
Well 10 is at least three, and is distributed at equal intervals around injection well 9, and the communicating passage on pit shaft and stratum is established, and completes spray
After sand perforation, fetches completion tool and withdraw coiled tubing 7；
S3, note chemical reagent heating: as shown in figure 4,9 wellbore of injection well is connected to production platform 1 by standpipe 5, it will even
Continuous oil pipe 7 is entered in 9 wellbore of injection well by standpipe 5 from production platform 1, and chemical heating agent is injected inside coiled tubing 7, is added
Hot 9 wellbore rock stratum of injection well, makes the gas hydrate dissociation around injection well 9；
S4, production gas hydrates: after gas hydrate dissociation in rock stratum seepage flow, under differential pressure action enter week
It encloses in 10 wellbore of producing well, into after wellbore, continues under differential pressure action, flow up, gas transmission line 11 is by 10 well of producing well
The natural gas of production of looking unfamiliar is collected to gathering system 12 in seabed, and gathering system 12 is unified to be delivered to production platform 1 by standpipe 5,
Complete the production work of gas hydrates.
Claims (4)
1. a kind of deep seafloor surface layer gas hydrate mining methods, it is characterised in that: the following steps are included:
S1, injection catheter drilling well: the depth of stratum for being designed conduit tripping in using injection catheter drilling technology is sprayed using drill bit
The gravity aperture of water jet and conduit and drilling tool itself, drill bit bottom connect mud motor, and drill bit is when spraying aperture
Tripping in, sheathed catheter, with drill bit and drilling tool tripping in, respectively obtain producing well and injection well, the spray outside drill bit and drilling tool
When penetrating conduit to mud line or less 20m, bit pressure control is in 138~180kN, if range of the bit pressure beyond design, just reduces injection
Conduit bit speed increases discharge capacity and replaces into the cleaning of thick bentonite slurry or up and down conduit (2), until bit pressure is designing
In the range of after continue injection catheter drilling well, for injection catheter drilling well, conduit finally in place when bit pressure it is particularly significant,
It cannot be below the 80% of maximum bit pressure, not only avoidable pipe string, which is excessively pressurized, bends, but also may make what conduit (2) can bear
Full payload tends to be maximum；
S2, connection wellhead assembly and completion practice: after conduit tripping in projected depth, christmas tree is transferred by standpipe to seabed, and
The well head head with the producing well in seabed and injection well is attached respectively, and coiled tubing carries jetting tool and enters inside pit shaft,
Injection high speed takes sand flow body inside to coiled tubing, is acted on by sand to the erosion of conduit and forms aperture on conduit, establishes well
The communicating passage of cylinder and stratum fetches completion tool and withdraws coiled tubing after completing abrasive perforating；
S3, note chemical reagent heating: injection well wellbore is connected to production platform by standpipe, and coiled tubing is passed through standpipe from life
It produces platform to enter in injection well wellbore, chemical heating agent is injected inside coiled tubing, heat injection well wellbore rock stratum, make
Gas hydrate dissociation around injection well；
S4, production gas hydrates: seepage flow, the life around under differential pressure action in rock stratum after gas hydrate dissociation
It produces in well wellbore, into after wellbore, continues under differential pressure action, flow up, the day that gas transmission line produces producing well wellbore
Right gas is collected to gathering system in seabed, and gathering system uniformly passes through production riser and is delivered to production platform, completes gas water
Close the production work of object.
2. a kind of deep seafloor surface layer gas hydrate mining methods according to claim 1, it is characterised in that: described to lead
Pipe tripping in depth of stratum is within 200 meters.
3. a kind of deep seafloor surface layer gas hydrate mining methods according to claim 1, it is characterised in that: the note
The wellbore conduit sandblasting operation hole for entering well is formed in wellbore bottom, and the conduit spraying operation hole of the producing well is formed in bottom and arrives
Pit shaft medium position.
4. a kind of deep seafloor surface layer gas hydrate mining methods according to claim 1, it is characterised in that: the life
Producing well is at least three, and is distributed at equal intervals around injection well.
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| CN201610946867.5A CN106499368B (en) | 2016-10-26 | 2016-10-26 | A kind of deep seafloor surface layer gas hydrate mining methods |
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| CN201610946867.5A CN106499368B (en) | 2016-10-26 | 2016-10-26 | A kind of deep seafloor surface layer gas hydrate mining methods |
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| CN106499368A CN106499368A (en) | 2017-03-15 |
| CN106499368B true CN106499368B (en) | 2019-01-11 |
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| CN107288584B (en) * | 2017-07-14 | 2020-06-26 | 中国矿业大学 | Combustible ice rotary-spraying pressure-relief fluidization mining method |
| CN109695441A (en) * | 2017-10-23 | 2019-04-30 | 大庆东油睿佳石油科技有限公司 | A kind of method of parallel water horizontal well microwave heating exploitation of gas hydrate |
| CN110017120B (en) * | 2019-04-02 | 2021-08-17 | 中国地质科学院勘探技术研究所 | Method for building vertical well bottom high-strength chamber |
| CN110043190B (en) * | 2019-04-02 | 2020-08-18 | 中国地质科学院勘探技术研究所 | Method for building vertical well large-diameter chamber |
| CN110029968B (en) * | 2019-04-08 | 2020-02-14 | 中国石油大学(华东) | Device for drilling hydrate micro well and quickly completing well and working method |
| CN111648749A (en) * | 2020-07-09 | 2020-09-11 | 中国海洋石油集团有限公司 | Seabed shallow surface layer natural gas hydrate mobile vertical pipe type mining system and mining method |
| CN112343557B (en) * | 2020-12-18 | 2021-11-23 | 福州大学 | Sea area natural gas hydrate self-entry type exploitation device and exploitation method |
| CN115217446B (en) * | 2021-04-21 | 2024-03-29 | 中石化石油工程技术服务有限公司 | Resource exploitation method and device |
| CN113006744B (en) * | 2021-04-30 | 2022-08-26 | 刘刚 | Well drilling method and well drilling equipment suitable for natural gas hydrate stratum |
| CN114109359B (en) * | 2021-11-16 | 2022-06-17 | 广州海洋地质调查局 | Application method of sea-bottom hydrate reservoir vertical content distribution accurate evaluation device |
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| FR2621071B1 (en) * | 1987-09-29 | 1996-01-12 | Inst Francais Du Petrole | METHOD AND SYSTEM FOR PRODUCING AN EFFLUENT CONTAINED IN AN UNDERWATER GEOLOGICAL FORMATION |
| CN100351491C (en) * | 2002-12-13 | 2007-11-28 | 石油大学(北京) | Thermal recovery method for coal seam gas |
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