CN110043229A - A kind of more well group connection convergence recovery methods of Gas Hydrate In Sea Areas - Google Patents
A kind of more well group connection convergence recovery methods of Gas Hydrate In Sea Areas Download PDFInfo
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- CN110043229A CN110043229A CN201910263277.6A CN201910263277A CN110043229A CN 110043229 A CN110043229 A CN 110043229A CN 201910263277 A CN201910263277 A CN 201910263277A CN 110043229 A CN110043229 A CN 110043229A
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- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000011084 recovery Methods 0.000 title claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 claims abstract description 53
- 238000005553 drilling Methods 0.000 claims abstract description 39
- 238000000605 extraction Methods 0.000 claims abstract description 16
- 150000004677 hydrates Chemical class 0.000 claims abstract description 16
- 238000010276 construction Methods 0.000 claims abstract description 14
- 230000006837 decompression Effects 0.000 claims abstract description 12
- 210000003296 saliva Anatomy 0.000 claims abstract description 12
- 239000004576 sand Substances 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims description 60
- 239000004568 cement Substances 0.000 claims description 8
- 238000007711 solidification Methods 0.000 claims description 8
- 230000008023 solidification Effects 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 241001074085 Scophthalmus aquosus Species 0.000 claims description 5
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 4
- 150000004767 nitrides Chemical class 0.000 claims description 4
- 239000013535 sea water Substances 0.000 claims description 4
- 239000011440 grout Substances 0.000 claims description 3
- 239000000523 sample Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 239000003345 natural gas Substances 0.000 claims description 2
- 230000036571 hydration Effects 0.000 claims 1
- 238000006703 hydration reaction Methods 0.000 claims 1
- 238000007789 sealing Methods 0.000 abstract description 8
- 239000012141 concentrate Substances 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 41
- 238000004140 cleaning Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- 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
- 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
-
- 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
- E21B43/01—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 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
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
-
- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/043—Directional drilling for underwater installations
-
- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/046—Directional drilling horizontal drilling
-
- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
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Abstract
A kind of more well group connection convergence recovery methods of Gas Hydrate In Sea Areas, include the following steps: that vertical well is crept into；The construction of vertical well shaft bottom gas collection chamber；Horizontal Well Drilling into: including diameter segment, the first inclination section, steady tilted section, the second inclination section and horizontal segment；The second production casing of tripping in horizontal well, the end of second production casing and the side wall for the gas collection chamber manually built are connected and sealed；Later period complete well reservoir reconstruction and sand control screen tripping in；It more saliva horizontal wells drilling and is docked and connected sealing with vertical well；It is depressured extraction.The present invention is docked and connected using a bite vertical well and more saliva horizontal wells, improves the contact area of well group and gas hydrates layer ore body, improves gas production；More well convergences concentrate extraction to greatly reduce the quantity of well later period decompression extraction well, play the role of significantly reducing operation management cost.
Description
Technical field
The present invention relates to ocean gas hydrate energy development application fields more particularly to a kind of sea area natural gas to be hydrated
The more well group connection convergence recovery methods of object.
Background technique
By the end of the year 2017, China has found 173 kinds of mineral products, and wherein gas hydrates are current year newly to found mineral, tentatively
Predict about 80,000,000,000 tons of oil equivalents of China's Gas Hydrate In Sea Areas stock number, rich reserves.
South Sea Shenhu sea area hydrate pilot production in 2016 is although have been achieved for immense success, by the controllable reservoir face of straight well
Long-pending limitation, produces tolerance daily and the continuously steady production time is also not nearly enough, industrialization apart from hydrate exploitation it is also quite long away from
From it is inevitable for being connected to convergence production technique to apply to the hydrate pilot production of pilot test area with more well groups by horizontal well drilling technology
Trend.What Present Global Gas Hydrate In Sea Areas pilot production scheme used is straight well voltage drop method pilot production technology, i.e., bores straight well
Hydrate reservoir is proceeded to, hydrate pilot production is carried out using voltage drop method.It facts have proved: 6 days production 12 ten thousand steres of gas of the pilot production having, shadow
It rings reservoir range and there was only 10 meters or so.And some uses straight well pilot production continuous production 60 days, produces 300,000 m3 of gas.With pushing away for time
It moves, hydrate exploitation is carried out by vertical well, hydrate gas production is quickly reduced in a short time, exposes vertical well control ore faces product
It is small and the drawbacks of cannot achieve stable yields.
Exploitation of gas hydrates should realize that industrialization is exploited, and need to develop efficient key technology in this way and carry out supporting industry
Progress.More well connection convergence production techniques are connected to form four-way eight with a bite vertical well simultaneously by boring more mouthfuls of directional horizontal wellss
" well factory " the gas production mode reached simplifies production routine, reduces cost of winning, and realization is substantially increased production, and is the production of sea area hydrate
Industry, which melts to adopt, provides an important volume increase stable yields method.
Summary of the invention
In view of the problems of the existing technology the present invention, provides a kind of more well groups connection convergences of Gas Hydrate In Sea Areas and opens
Mining method is docked and connected using a vertical well with multiple horizontal wells, and the contact of well group and gas hydrates layer ore body is improved
Area improves gas production；More well convergences concentrate extraction to greatly reduce the quantity of well later period decompression extraction well, play significant drop
The effect of low operation management cost.
Technical problem of the present invention is solved with following technical solution:
A kind of more well group connection convergence recovery methods of Gas Hydrate In Sea Areas, including following stages of mining:
A, vertical well is crept into: vertical well is bored by seabed mud face reaches gas hydrates layer top plate, does not enter hydrate layer, vertical
The first surface pipe of tripping in is cemented the well in well, and vertical well is drilled into hydrate layer bottom plate or less later；
B, the construction of vertical well shaft bottom gas collection chamber: the hydrate layer bottom plate lower part at vertical well carries out major diameter and expands chamber, shape
At artificial cavity, grout filling well cementation is injected in artificial cavity, Hou Ning forms artificial solidified body, the artificial solidified body
Hole is drilled through under reaching after intensity requirement, and is crept into the artificial solidified body, the tripping in first in first surface pipe
Production casing, well cementation, Hou Ning, lower bore sweeps cement extra in the first production casing after cementing concrete reaches solidification intensity, position
Gas collection chamber of the first production casing inner cavity as entire well group inside artificial solidified body；
C, the drilling of horizontal well: horizontal well construction straight well section and the first inclination section are drilled on the gas hydrates layer top plate
Side, the second surface pipe of tripping in are cemented the well；After magnetic signal generating device is added at drill bit, lower brill carries out horizontal well hold angle
Section, the drilling of the second inclination section and horizontal segment are led to when the horizontal segment drilling is to apart from the gas collection chamber target spot certain distance
The magnetic orientation measuring probe for crossing logging cable tripping in vertical well receives what the magnetic signal generating device at horizontal well drill issued
Magnetic signal, it is accurate that horizontal well drill is guided to pierce in the target area of the gas collection chamber below vertical well；
D, the end of the second production casing of tripping in horizontal well, second production casing passes through artificial solidified body and the collection
The side wall of gas chamber is tightly connected, and is carried out sealed pressure in connected well group and tested；
E, horizontal well carries out later period complete well reservoir reconstruction and sand control screen tripping in；
F, carry out the drilling of more saliva horizontal wells according to step c-d, more saliva horizontal wells with the air collecting chamber below same a bite vertical well
Room communication seals；
G, the tripping in gas production tubing string in vertical well, carries out decompression extraction.
The above-mentioned more well groups of Gas Hydrate In Sea Areas, which are connected to, converges recovery methods, in the step c, the well of the horizontal segment
Oblique angle is 45-88 °, and the well length of the horizontal segment is 100-2000m.
The above-mentioned more well groups of Gas Hydrate In Sea Areas, which are connected to, converges recovery methods, in the step b, the artificial solidified body
Diameter r >=2m, in the artificial solidified body under drill through hole, artificial solidified body bottom does not drill, bottom retain solidified body
Thickness >=2m.
The above-mentioned more well groups of Gas Hydrate In Sea Areas, which are connected to, converges recovery methods, and in the step a, vertical well is drilled into water
Close nitride layer bottom plate or less 20-50m.
The above-mentioned more well groups of Gas Hydrate In Sea Areas, which are connected to, converges recovery methods, in the step b, the first production set
When extra cement brill is swept in pipe, bottommost retains one section of concrete column, height >=2m.
The above-mentioned more well groups of Gas Hydrate In Sea Areas, which are connected to, converges recovery methods, the depth in the step f, according to seawater
Sealed pressure >=the 10MPa being connected in well group is determined with the amplitude of extraction decompression.
The above-mentioned more well groups of Gas Hydrate In Sea Areas, which are connected to, converges recovery methods, in the step f, neighbouring two mouthfuls
Horizontal well at a distance from the vertical direction that the gas collection chamber seals the joint >=1m.
The more well groups connection convergence recovery methods of above-mentioned Gas Hydrate In Sea Areas, in the step c, the well head of horizontal well with
Vertical well well head horizontal distance is 200-2000m, is determined according to well group production capacity to be achieved and gas hydrates are thick layer by layer, institute
When stating horizontal segment drilling to apart from the gas collection chamber target spot 100m, guidance horizontal well drill pierces the artificial solid of vertical well shaft bottom
Change in intracorporal gas collection chamber.
The present invention uses more well convergence patterns, and a bite vertical well is docked and connected with more saliva horizontal wells, centered on vertical well
Artificial solidified body is built in gas recovery well, bottom, and gas collection chamber is arranged, and in vertical well surrounding arrangement horizontal well separated by a distance, divides
It does not pierce in the air collecting chamber room of vertical well shaft bottom, and is docked and connected with gas collection chamber, form the complete " u "-shaped channel of a rule, greatly
Reduce the quantity of well gas extraction system greatly, and realized being substantially improved for yield, reduces later period operation management cost；It is horizontal
Horizontal segment drilling and the vertical direction of well keep 45-88 ° of inclinations angle, and wellbore trace from top to bottom penetrates hydrate ore bed, rear
Phase is depressured during extraction, and the water of output and a small amount of sand can collect in center by gravity and flow action automatically and hang down in stratum
Straight well shaft bottom, centralized and unified discharge；The first surface pipe and the second surface pipe of tripping in are distinguished in vertical well neutralization levels well,
Both for insulating hydrate superstratum, while being also used to support the weight of the above wellhead assembly in mud face.
Detailed description of the invention
Fig. 1 is the more well convergence pattern structural schematic diagrams of the present invention；
Fig. 2 is the artificial solidified body sealed chamber structural schematic diagram in vertical well shaft bottom；
Fig. 3 is that single port horizontal well and vertical well are docked and connected structural schematic diagram.
Each label respectively indicates in figure are as follows: A, horizontal segment；B, the second inclination section；C, steady tilted section；D, the first inclination section；E, straight
Well section；R1, the first inclination section are averaged dog-leg severity；R2, the second inclination section are averaged dog-leg severity；L, horizontal well and vertical well well head away from
From；H, gas hydrates are thick layer by layer；H1, hydrate layer top plate depth；H, the height of artificial cavity；R, artificial cavity is straight
Diameter；1, mud face；2, gas hydrates layer top plate；3, the first surface pipe；4, gas collection chamber；5, the first production casing；6,
Two surface pipes；7, the second production casing；8, gas production tubing string；9, vertical well；10, horizontal well；11, hydrate layer bottom plate；12, people
Make solidified body.
Specific embodiment
The present invention is drilled into hydrate layer bottom plate or less 20-50m as target well using centered on a bite vertical well, this is vertical
Depending on specifications and models of the size and depth of the complete well diameter of well according to current mature completion tubular column and electric submersible pump etc., and it is full simultaneously
It adopts gas production sufficient day and later period horizontal well is docked and connected the basic demand of sealing, the complete well production casing specification of usual vertical well is not
Less than φ 339.7mm.Horizontal well well location is arranged in vertical well surrounding according to the distribution characteristics of hydrate ore bed, respectively with certain
Horizontal segment inclination angle from top to bottom penetrates hydrate layer, and for horizontal segment hole angle usually at 45~88 °, precision auger proceeds to vertical well shaft bottom
In the artificial air collecting chamber room built in solidified body, and Dock With Precision Position is connected to therewith.It every mouth horizontal well casing pipe end all must be with
Vertical well forms reliable sealing.All horizontal well channels and vertical well are finally realized in a sealing system, reaches a bite and hangs down
The studies of natural gas hydrate dissociation by depressurization in different scale hydrate reservoirs to all horizontal wells can be completed in straight well extraction, achievees the purpose that well decompression, well group produce gas.
The invention will be further described with reference to embodiments.
A, vertical well is crept into: vertical well 9 is bored by seabed mud face 1 reaches gas hydrates layer top plate 2, but does not enter hydrate
In layer, the first surface pipe of tripping in 3 is cemented the well down toward gas hydrates layer top plate 2 in vertical well, first table
Layer casing 3 avoids causing decomposition of hydrate to influence because of well cementation heat release for hydrate layer and superstratum and seawater to be isolated
Cementing quality；First surface pipe 3 usually selects no less than 20 " casing, then by vertical well be drilled into hydrate layer bottom plate 11 with
Lower 20-50m.
B, the construction of vertical well shaft bottom gas collection chamber: in 11 lower part of hydrate layer bottom plate of vertical well, (free gas-bearing formation is non-
In hydrate layer) major diameter expansion chamber is carried out, artificial cavity is formed, grout filling well cementation, Hou Ning, shape are injected in artificial cavity
At artificial solidified body 12, diameter r >=2m of artificial solidified body 12, artificial solidified body 12 drills through hole under reaching after intensity requirement, and
It is drilled into artificial solidified body 12, does not drill, solidification body thickness >=2m that artificial 12 bottom of solidified body retains, on first surface layer
The first production casing of tripping in 5 in casing 3, well cementation, Hou Ning, lower bore sweeps the first production casing after cementing concrete reaches solidification intensity
Extra cement in 5, and 5 bottommost of the first production casing retains one Duan Gaodu >=2m concrete column, for bearing sealing in pipe
Pressure；Gas collection chamber 4 of 5 inner cavity of the first production casing as entire well group inside artificial solidified body 12；Artificial solidification
Body 12 is built in free gas-bearing formation or non-hydrated nitride layer, is avoided caused by solidifying heat release because of curing materials during manually building chamber
Decomposition of hydrate influences to fill cementing quality；The height h and diameter r of artificial solidified body determine according to the requirement of decompression sealing,
Theoretically the bigger r value the safer, depending on the attainable maximum rotary jet strengthening radius of current institute and maximum expansion chamber ability；H value
The size quantity of horizontal well that is connected to as needed determine that the horizontal well of connection is more, and h value is bigger.
C, the drilling of horizontal well: according to well group production capacity to be achieved and gas hydrates layer by layer thickness H determine horizontal well with
The distance L of vertical well well head is 200-2000m；Horizontal well construction straight well section E and the first inclination section D, is drilled into gas hydrates
2 top of layer top plate, the second surface pipe of tripping in 6 are cemented the well；After magnetic signal generating device is added at drill bit, lower brill is carried out
The drilling of horizontal well steady tilted section C, the second inclination section B and horizontal segment A, the steady tilted section C as adjustment well section, drilling length according to
Determine according to the first inclination section be averaged track Chuan Kuang of dog-leg severity R2 and horizontal segment A of dog-leg severity R1, the second inclination section that is averaged, horizontal segment
When A drilling is to 4 target spot 100m of gas collection chamber apart from vertical bottom, the magnetic orientation for passing through logging cable tripping in vertical well is surveyed
Amount probe receives the magnetic signal that the magnetic signal generating device at horizontal well drill issues, accurate that horizontal well drill is guided to pierce vertically
In the target area of gas collection chamber 4 in the artificial solidified body 12 in well shaft bottom；It is 45-88 ° that horizontal segment A, which creeps into hole angle, and inclination angle can be protected
The water and sand generated when card decompression extraction can be pooled in vertical well automatically by gravity and flow action, prevent horizontal well silt particle
Blocking, and focus on and be discharged using the exploitation hoisting system of vertical well, the well length of the horizontal segment A is 100-
2000m。
D, the end of the second production casing of tripping in 7 in horizontal well, second production casing 7 passes through artificial solidified body 12
It is connected and sealed with the side wall of the gas collection chamber 4, and carries out sealed pressure in connected well group and test, the depth according to seawater
Sealed pressure >=10MPa in horizontal well is determined with the amplitude of extraction decompression.
E, horizontal well carries out later period complete well reservoir reconstruction and sand control screen tripping in.
Referring to Fig. 1 and Fig. 2, the drilling of more saliva horizontal wells is carried out according to step c-d, more saliva horizontal wells are vertical with same a bite
The gas collection chamber 4 of bottom seals connection；What two mouthfuls of neighbouring water horizontal wells and the gas collection chamber 4 sealed the joint
Distance >=1m in vertical direction, fully ensures that the stability of the reliability and cavity that are docked and connected, and facilitates simultaneously subsequent complete
The smooth tripping in of well and workover tool；Tripping in gas production tubing string 8, carries out decompression extraction in vertical well.
Referring to Fig. 3, the buried depth of usual ocean gas hydrate all than shallower, get over by hydrate layer top plate depth H 1
Small, the first inclination section is averaged, and dog-leg severity R1 is accordingly bigger, in addition hydrate system stratum is very soft, deflecting difficulty of construction is bigger；It
Right gas hydrate thickness H thicker (>=30m) layer by layer, guarantee is identical wear the chief of a pit's degree under the conditions of, the hole angle of horizontal segment A can subtract
It is small, the discharge of water and sand when being more advantageous to later period decompression extraction, while the average dog-leg severity of the first inclination section D can also be reduced, it drops
The difficulty of construction of low first inclination section, whereas if gas hydrates thickness H relatively thin (≤20m) layer by layer, horizontal segment A hole angle
It then suitably to increase, wear chief of a pit's degree with guarantee horizontal well；The selection of well spacing L is according to well group production capacity to be achieved and gas water
It closes the factors such as nitride layer thickness H and determines that optional range is wider, usually in 200-2000m or so；The height h of artificial solidified body and
Radius r determines that theoretically the bigger r value the safer according to decompression seal request, according to the attainable maximum rotary jet strengthening of current institute
Depending on radius and maximum expansion chamber ability, the size of h value is connected to the quantity of horizontal well as needed to determine, the horizontal well of connection is got over
More, h value is bigger.
Into in the process, steady tilted section C creeps into length and is averaged dog-leg severity according to the first inclination section as adjustment section Horizontal Well Drilling
The be averaged track Chuan Kuang of dog-leg severity R2 and horizontal segment A of R1, the second inclination section is determined, if the practical deflecting of the first inclination section D is flat
Equal dog-leg severity is less than Theoretical Design value, then the length of steady tilted section C can suitably shorten, and the second inclination section B carries out deflecting in advance to lift
High vertical depth, prevents track from sinking, whereas if the practical deflecting of the first inclination section D is averaged, dog-leg severity is greater than Theoretical Design
Value, then the extended length of steady tilted section C, postpones the drilling of the second inclination section B, reduces the first inclination section D because average dog-leg severity increases
Caused by lift on drilling track, keep practical drilling trace and Theoretical Design track almost the same.
It is further described below in conjunction with a specific real case:
Following hole depth is calculated since mud face, and horizontal distance L of the horizontal well well head apart from vertical well well head is 600m.
Technical requirements:
(1) the gas hydrates layer clearly to be exploited is located at mud face or less the depths 190~220m, i.e. H1 is 190 ~ 220m, day
Thickness H is 30m to right gas hydrate layer by layer, and horizontal well horizontal segment creeps into 86 ° of hole deviation, and horizontal segment creeps into length 400m, horizontal well first
The inclination section D dog-leg severity R1 that is averaged is 15 °/30m, and for drilling to 70 ° of hole deviation, steady tilted section C creeps into 50m, and the second inclination section B is averaged dog-leg
Degree R2 is 6 °/30m, and drilling is to 86 ° of hole deviation into horizontal segment, and horizontal segment A keeps 86 ° of drilling 400m of hole deviation, with vertical well target spot
It is docked and connected.
(2) in horizontal well, tripping in 20 in straight well section E " the second surface pipe 60m, 13 3/8 " table of the first inclination section D tripping in
Layer casing, cements the well down toward at 2 vertical thickness 10m of hydrate top plate.In vertical well, 20 " the first surface pipe depth of settings
It for 180m, away from hydrate layer top plate 10m and cements the well, depth location of the vertical well in 222~240 m carries out cavity construction.Specifically
Construction step is as follows:
A, vertical well is crept into: drilling to hole depth 182m, and it is " solid at the first surface pipe 3 to 180m that thick slurry recycles borehole cleaning, tripping in 20
Well, the first surface pipe head is away from hydrate layer top plate 10m.
B, it the construction of vertical well shaft bottom gas collection chamber: 1. waits to coagulate and sweeps plug: hydrate layer is drilled, until hole depth 260m, thick slurry are followed
Pull out of hole after ring borehole cleaning, drilling depth than artificial cavity depth depth 20m, the purpose is to: when reaming, for storage part cannot
The sediment returned reduces the difficulty of major diameter reaming deslagging borehole cleaning；2. descend whirl spraying drilling tool or borehole-enlarging drilling tool respectively, hole depth 222~
The position of 240m carries out manually building chamber and well cementation filling；3. waiting solidifying cleaning bottom of hole: crept into again to hole depth 235m, loop cleaning inner hole deposition
Slag, tripping in 13 3/8 " the first production casing well cementation.Wherein enter the indoor production casing of air collecting chamber and uses copper, aluminium or titanium alloy
The preferable non-magnetic material of drillability replaces steel sleeve, is docked and connected for later period horizontal well and provides a non-magnetic environment, improves docking
The passing through property of PDC drill bit when connection.
C, first Horizontal Well Drilling into: 1., straight well section E drilling: straight well section E bores depth 62m, time 20 " surface pipe 60m；②,
The first inclination section D is crept into horizontal well: average dog-leg severity R1 is 15 °/30m, is crept into after 70 ° of hole deviation, and steady tilted section C creeps into 35m,
Creep into hole depth 235m.During practice of construction, well track can not be executed fully according to design, at this point, steady tilted section exists
Here it can play the role of adjustment, finally to be advisable apart from hydrate top plate vertical depth 10m, if the first build angle rate section D's is averaged
Dog-leg severity >=15 °/30m, steady tilted section can lengthen, conversely, steady tilted section will shorten, for making up caused by first segment building force deficiency
Hole deviation deficiency and drilling track vertical depth move down.It recycles borehole cleaning afterwards in place, pulls out of hole, " the surface pipe well cementation of tripping in 13 3/8；3., wait
Solidifying plug of sweeping: the kick-off assembly of the strong magnetic connector of tripping in band (survey without magnetic drilling rod by PDC drill bit+strong magnetic connector+deflecting helicoid hydraulic motor+
Well instrument), continue angle holding drilling 15m after having swept cement plug, the drilling length of steady tilted section can also be also according to the first inclination section
Actual average dog-leg severity is adjusted, if the first inclination section is practical to creep into average dog-leg severity lower than design value, the length of steady tilted section
Degree can shorten or cancel, directly beginning the second inclination section B creep into, steady tilted section be intended only as an adjustment well section come using；④,
After the second inclination section B hole deviation reaches 86 °, well depth about 330m, horizontal segment A is drilled into, horizontal drilling is to away from vertical well target
At target spot 100m (calculated value), the magnetic that horizontal well issues is received by the magnetic orientation measuring instrument of tripping in vertical well and is believed
Number, judge the relative position of drill bit and target spot, it is accurate that horizontal well drill is guided to pierce in the artificial solidified body 12 in vertical well shaft bottom
In air collecting chamber room, the connection of horizontal well and vertical well, horizontal well finishing drilling hole depth about 730m are realized.
D, thick slurry well-flushing after the completion of connection proposes brill, tripping in 9 5/8, and " the second production casing, cannula tip pass through artificial solidification
Body is sealed with gas collection chamber, completes the seal construction task that is docked and connected of a bite horizontal well and vertical well.
E, the rest may be inferred, can be completed at the same time the sealing that is docked and connected of more saliva horizontal wells and vertical well, is formed a plurality of same
Production gas channel in sealing system.Every saliva horizontal well is selected in the different depth position connection of artificial solidified body, mutually concedes 1-5m
Space length.The position distribution of more saliva horizontal wells in the plane is not necessarily intended to be evenly distributed with by circumference, with reference to vertical well periphery
Hydrate geology distribution situation, the drilling track of horizontal well is arranged in hydrate reservoir is more stable and the high side of grade as far as possible
On position.
Claims (8)
1. a kind of more well group connection convergence recovery methods of Gas Hydrate In Sea Areas, characterized by the following steps:
A, vertical well is crept into: vertical well (9) is bored by seabed mud face (1) reaches gas hydrates layer top plate (2), does not enter hydrate
Layer, the first surface pipe of tripping in (3) is cemented the well in vertical well, and vertical well is drilled into hydrate layer bottom plate (11) below；
B, the construction of vertical well shaft bottom gas collection chamber: hydrate layer bottom plate (11) lower part at vertical well carries out major diameter expansion
Chamber forms artificial cavity, and grout filling well cementation is injected in artificial cavity, and Hou Ning forms artificial solidified body (12), the people
It makes and drills through hole under solidified body (12) reaches after intensity requirement, and creep into the artificial solidified body (12), in first table
Layer casing (3) interior first production casing of tripping in (5), well cementation, Hou Ning, lower bore sweeps the first life after cementing concrete reaches solidification intensity
Cement extra in casing (5) is produced, is located at artificial solidified body (12) internal the first production casing (5) inner cavity as entire well group
Gas collection chamber (4)；
C, the drilling of horizontal well: horizontal well (10) construction straight well section (E) and the first inclination section (D) are drilled into the natural gas hydration
Above nitride layer top plate (2), the second surface pipe of tripping in (6) is cemented the well；After magnetic signal generating device is added at drill bit, under
It bores, carries out the drilling of horizontal well steady tilted section (C), the second inclination section (B) and horizontal segment (A), horizontal segment (A) drilling arrives distance
When gas collection chamber (4) the target spot certain distance, water is received by the magnetic orientation measuring probe of logging cable tripping in vertical well
The magnetic signal that magnetic signal generating device at horizontal well drill bit issues, accurate guidance horizontal well drill pierce described below vertical well
In the target area of gas collection chamber (4)；
D, the end of the second production casing of tripping in (7) in horizontal well, second production casing (7) passes through artificial solidified body
(12) it is tightly connected with the side wall of the gas collection chamber (4), and carries out sealed pressure in connected well group and test；
E, horizontal well carries out later period complete well reservoir reconstruction and sand control screen tripping in；
F, carry out the drilling of more saliva horizontal wells according to step c-d, more saliva horizontal wells with the air collecting chamber below same a bite vertical well
Room (4) communication seals；
G, the tripping in gas production tubing string (8) in vertical well, carries out decompression extraction.
2. the more well group connection convergence recovery methods of Gas Hydrate In Sea Areas according to claim 1, it is characterised in that: institute
It states in step c, the hole angle of the horizontal segment (A) is 45-88 °, and the well length of the horizontal segment (A) is 100-2000m.
3. the more well group connection convergence recovery methods of Gas Hydrate In Sea Areas according to claim 2, it is characterised in that: institute
It states in step b, diameter r >=2m of the artificial solidified body (12), drills through hole in the case where the artificial solidified body (12) is interior, it is artificial solid
Change body (12) bottom not drill, solidification body thickness >=2m that bottom retains.
4. the more well group connection convergence recovery methods of Gas Hydrate In Sea Areas according to claim 3, it is characterised in that: institute
It states in step a, vertical well is drilled into hydrate layer bottom plate (11) following 20-50m.
5. the more well group connection convergence recovery methods of Gas Hydrate In Sea Areas according to claim 4, it is characterised in that: institute
It states in step b, when extra cement brill is swept in first production casing (5), bottommost one section of concrete column of reservation, height >=
2m。
6. the more well group connection convergence recovery methods of Gas Hydrate In Sea Areas according to claim 5, it is characterised in that: institute
It states in step f, the depth according to seawater determines the sealed pressure >=10MPa being connected in well group with the amplitude that extraction is depressured.
7. the more well group connection convergence recovery methods of Gas Hydrate In Sea Areas according to claim 6, it is characterised in that: institute
State in step f, two mouthfuls of neighbouring water horizontal wells at a distance from the vertical direction that the gas collection chamber (5) seals the joint >=
1m。
8. the more well group connection convergence recovery methods of Gas Hydrate In Sea Areas according to claim 7, it is characterised in that: institute
It states in step c, well head and vertical well the well head distance (L) of horizontal well are 200-2000m, according to well group production capacity to be achieved and day
Right gas hydrate determines layer by layer thick (H)；When horizontal segment (A) drilling is to apart from gas collection chamber (4) the target spot 100m, guidance
Horizontal well drill pierces in the intracorporal gas collection chamber of artificial solidification in vertical well shaft bottom.
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| CN110295901A (en) * | 2019-07-30 | 2019-10-01 | 核工业北京化工冶金研究院 | A kind of mining using leaching technology method and system |
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| CN111764871A (en) * | 2020-07-08 | 2020-10-13 | 广州海洋地质调查局 | Natural gas hydrate reservoir direct-increasing horizontal mining method |
| CN112796660A (en) * | 2021-01-25 | 2021-05-14 | 北京大地高科地质勘查有限公司 | Construction method of double-parallel-branch horizontal communication well |
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