CN106761587B - Ocean aleuritic texture reservoir gas hydrates multiple-limb hole finite sand control recovery method - Google Patents
Ocean aleuritic texture reservoir gas hydrates multiple-limb hole finite sand control recovery method Download PDFInfo
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- 239000004576 sand Substances 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 35
- 150000004677 hydrates Chemical class 0.000 title claims abstract description 19
- 238000011084 recovery Methods 0.000 title claims abstract description 13
- 238000005516 engineering process Methods 0.000 claims abstract description 8
- 238000011010 flushing procedure Methods 0.000 claims abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 40
- 230000015572 biosynthetic process Effects 0.000 claims description 18
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 238000013461 design Methods 0.000 claims description 4
- 238000005065 mining Methods 0.000 claims description 4
- 241001074085 Scophthalmus aquosus Species 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 240000007049 Juglans regia Species 0.000 claims description 2
- 235000009496 Juglans regia Nutrition 0.000 claims description 2
- 239000006004 Quartz sand Substances 0.000 claims description 2
- 239000004568 cement Substances 0.000 claims description 2
- 238000004088 simulation Methods 0.000 claims description 2
- 238000004513 sizing Methods 0.000 claims description 2
- 235000020234 walnut Nutrition 0.000 claims description 2
- 235000013399 edible fruits Nutrition 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 15
- 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 abstract description 9
- 238000011161 development Methods 0.000 abstract description 6
- 230000035699 permeability Effects 0.000 abstract description 5
- 206010010356 Congenital anomaly Diseases 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 10
- 230000006837 decompression Effects 0.000 description 9
- 238000000354 decomposition reaction Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000012856 packing Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000003276 anti-hypertensive effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
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- 238000011065 in-situ storage Methods 0.000 description 1
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- 238000005381 potential energy Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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Classifications
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- 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
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- 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
- E21B43/02—Subsoil filtering
- E21B43/04—Gravelling of wells
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- Geology (AREA)
- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention belongs to ocean gas hydrate development of resources field of engineering technology, and in particular to a kind of ocean aleuritic texture reservoir gas hydrates multiple-limb hole finite sand control recovery method.It comprises the following steps：(1) main borehole bores and opens and use reserved branch hole sleeve completion；(2) bore and open multiple-limb hole, it is evenly distributed on around main borehole, in a certain angle with main borehole and align；(3) the pack gravel layer in main borehole casing periphery and multiple-limb hole, carries out finite sand control；(4) anti-flushing well, goes into operation, into substep buck stage.It the method overcome " congenital " weakness that shallow-layer hydrate reservoir is not suitable for carrying out fracturing reform, efficiently solve extremely low low with the stratum comprehensive strength, Sand-producing Tendency of China's South China Sea gas hydrates reservoir permeability it is serious between contradiction, adopting the duration for increase hydrate runin has an important reference significance, promotes hydrate to be commercialized the development of production technique.
Description
Technical field
The invention belongs to ocean gas hydrate development of resources field of engineering technology, and in particular to a kind of ocean aleuritic texture
Reservoir gas hydrates multiple-limb hole finite sand control recovery method.
Background technology
Natural gas hydrate resources are a kind of potential energy, have the characteristics that distribution is wide, energy resource density is high, are hydrated goods and materials
Source Exploitation research becomes international hot spots.But global hydrate development of resources is adopted still in the runin of subregion at present
Stage, distance industrialization exploitation are had got long long way to go.
China has accelerated research steps at present, accelerates the work of exploration and development to ocean gas hydrate resource.Root
According to international examination experience with mining early period, for conventional chiltern reservoir, voltage drop method is most effective recovery method.But decompression is opened
Diffusion process of the bottom pressure to hydrate reservoir certainly will be related to by adopting, and only when shaft bottom, low pressure travels to decomposition of hydrate leading edge position
Put, the hydrate in the region could be promoted further to decompose.Therefore reduce amplitude from the angle analysis of engineering, bottom pressure and get over
Greatly, the decomposition output of gas hydrates is more conducive to；From the angle analysis of geological conditions, formation particle is thicker, deposit heap
The pore-size that product is formed is bigger, is more conducive to the conduction of pressure wave, is more conducive to the decomposition output of hydrate.It is but excessive
Production pressure drop be bound to cause the caving in of pit shaft, engineering problem, particularly the Canada Mallik2007 such as stratum largely shakes out~
2008 projects and 2013 projects of Japan Nankai Trough experience show that phenomenon of shaking out is to restrict natural gas hydrate resources
The key factor of long-acting exploitation.Therefore, the high-efficiency mining of hydrate resource is realized, it is necessary to capture the efficient of pressure wave in stratum
The puzzlement that problem of transmission and the problem of shaking out are brought.
Especially, the tentatively preferred target area reservoir sedimentation thing of China's ocean gas hydrate pilot production at present is formed with clayey
Based on flour sand and silty clay, formation sand particle diameter is generally lower than 20 μm, is typical pore filling type hydrate reservoir.It is in situ
Test permeability and current piezometric conductivity is extremely low, therefore only be possible to accelerate water when bottom pressure reduction amplitude is larger
The extension of compound resolver, improves gas production rate；But since reservoir comprehensive strength is relatively low, blindly increases producing pressure differential and do not simply fail to
Production capacity is improved, and may cause that the borehole wall integrally collapses or formation damage largely shakes out, causes pit shaft sand to bury.To Nankai
The medium coarse sand hydrate reservoir that 2013 projects of Trough are faced is even in this way, adopt faced powder for the runin of China South Sea
Contradiction between chiltern reservoir, formation sand production and production capacity improve can be protruded more.
Therefore, to meet the exploitation of China's aleuritic texture reservoir natural gas hydrate resources, it is necessary to from geology angle and engineering
The aspect of angle two does existing decompression recovery method and improves or transform, and establishes new aleuritic texture reservoir hydrate exploitation pattern.
The content of the invention
The object of the present invention is to provide a kind of exploitation of ocean aleuritic texture reservoir gas hydrates multiple-limb hole finite sand control
Method, by multiple-limb hole around main borehole and finite sand control, the combination for controlling sand technology, realizes having for gas hydrates reservoir
Effect decompression exploitation, new approaches are provided for the exploitation of China's Gas Hydrate of The South China Sea.
The technical solution adopted by the present invention is as follows：
A kind of ocean aleuritic texture reservoir gas hydrates multiple-limb hole finite sand control recovery method, comprises the following steps：
(1) main borehole bores and opens and use reserved branch hole sleeve completion；
(2) bore and open multiple-limb hole, it is evenly distributed on around main borehole, in a certain angle with main borehole and align；
(3) the pack gravel layer in main borehole casing periphery and multiple-limb hole, carries out finite sand control；
(4) anti-flushing well, goes into operation, into substep buck stage.
The main borehole brill evolution formula is consistent with conventional drilling mode, specially bores and consolidates after opening hydrate reservoir upper formation
Well, is crept into when opening hydrate reservoir with large scale drill bit；The main borehole passes through reservoir, artificial bottom of a well reservoir bottom circle with
Under, stop certain sand setting pocket.
The main borehole completion mode is specially that casing is completed, and has certain reserve according to optimum results in described sleeve pipe
Hole, each preformed hole are the opening in multiple-limb hole, and reservoir bottom circle uses well cementing of cement, Reservoir Section between setting of casing and stratum
Not cementing.
To prevent bottom water or understratum fluid from entering lower part exception caused by possibility in pit shaft, and decompression recovery process
Pressure enters pit shaft, and the main borehole sleeve bottom is arranged to blind hole.
The multiple-limb hole is bored using flexible Manifold technology or other slim-hole radial well technologies and opened, after brill opens multiple-limb hole,
Outside casing gravel packing is carried out using huge discharge.
The gravel layer is quartz sand or artificial haydite, walnut shell etc., and sand block accuracy Design is tied according to finite sand control, anti-row
The basic thought of conjunction is designed.
The gravel layer size ratio conventional gravel sizing method design that multiple-limb hole finite sand control is filled is (such as
Saucier methods, Smith methods, Deprister methods etc.) thick 1~2 grade of result, it is less than formation fracture pressure in guarantee stowing pressure
Under the conditions of, filling compaction rate is improved as far as possible.The evaluation index filled outside the main borehole pipe has filling thickness, the closely knit journey of filling
Degree, gravel ratio；The evaluation index of multiple-limb hole finite sand control filling layer has filling compaction rate, gravel ratio, filling intensity etc..
It can determine to be suitable for the best branch pore geometry parameter combination of specific hydrate reservoir by method for numerical simulation, its
Middle branched hole geometric parameter includes branched hole phase angle, branched hole inclination angle, branch's hole density, branched hole aperture and branch's hole horizontal
Displacement etc..
The branched hole phase angle is analogous to perforation phase angle, in particular to adjacent two in conventional oil gas well perforation completion
Angle between the projection line of a branch's axially bored line in the plane.
The branched hole inclination angle refers to the angle between multiple-limb axially bored line and main borehole axis, and reservoir is thinner, to branch
The limitation at hole inclination angle is bigger, it is desirable to which branched hole inclination angle is also bigger, and branched hole inclination angle is in theory between 0~90 °.
Branch's hole density refers to branch's hole number on unit length main borehole, can use branch's hole number and branch
Pitch of holes is weighed, and branch's hole density is bigger, be more conducive to increase production.
The branched hole aperture can be weighed with the ratio of branched hole aperture and main borehole hole diameter, which is less than 1.
The branched hole horizontal displacement refers to the length of some projection line of branch's axially bored line in the plane, branched hole water
Prosposition shifting is bigger, is more conducive to the exposed of hydrate interface, is more conducive to increase production, but filling difficulty may increase accordingly.
The operation principle of the present invention is as follows：
(1) main borehole is jointly formed " binary channels " that pressure wave quickly transmits with multiple-limb hole, increases pressure in a short time
Ripple involves scope, improves decomposition of hydrate efficiency；
(2) the binary channels resolution model that main borehole and multiple-limb hole are formed is substantially increased between stratum hydrate and the borehole wall
Bare area, increase effectively shaft bottom hydrate and effectively decomposes front；
(3) radial flow of near wellbore during conventional buck method exploitation hydrate is changed into bilinearity by multiple-limb hole
Stream, reduces pit shaft throttle effect, advantageously reduces wellbore skin effect, improves production capacity；
(4) stratum multiple-limb hole and main borehole surrounding formation porosity and permeability obtain necessarily under the conditions of finite sand control
Improvement, further promote pressure wave propagation in the earth formation, expand hydrate and effectively decompose front；
(5) main borehole, multiple-limb hole, the limited band that shakes out in nearly branched hole stratum be collectively forming pressure conduction " triple channel " it is high
Speed belt, is conducive to improve antihypertensive effect；
(6) under the conditions of certain capacity requirements, multichannel decomposition of hydrate pattern that multiple-limb hole and main borehole are formed with
Individual well eye routine recovery method is compared, and is helped to alleviate pressure drop amplitude, is alleviated formation sand production, reduces cave-in risk；
(7) multiple-limb hole is evenly distributed on around main borehole, and main borehole uses reserved branch hole sleeve completion, and casing is to master
Wellbore formation has certain supporting role, so as to be conducive to keep the integrality of branched hole, can effectively extend hydrate decompression and open
Adopt the time；
(8) according to outside casing gravel packing dimensioning principles sold stowing gravel layer inside multiple-limb hole, to branched hole hole
Wall has certain supporting role, has effectively disperseed the stress that main borehole inner sleeve is born, so as to further promote decompression to open
Borehole wall integrality during adopting, effectively extends decompression mining time.
By above-mentioned experimental method, the present invention can realize following functions：
(1) present invention can ensure production sufficient in aleuritic texture reservoir voltage drop method recovery process under relatively low pressure reduction conditions
Can supply；
(2) present invention can effectively dredge near wellbore formation, improve hole and ooze parameter, promote the decomposition efficiency of hydrate；
(3) present invention can maintain the longer-term integrality of pit shaft, effectively extend the decompression exploitation cycle.
The present invention is suitable for having the hydrate reservoir voltage drop method of following stratum characteristic to exploit：
(1) hydrate reservoir buried depth is shallow, consolidation is poor, is not suitable for the aleuritic texture reservoir of fracturing reform；
(2) since thin matter content is high, be not suitable for carrying out the reservoir (i.e. aleuritic texture reservoir) of complete sand-preventing process design；
(3) be not suitable for carrying out the hydrate reservoir of conventional horizontal well drilling well；
(4) hydrate reservoir permeability is extremely low, the low reservoir of individual well pressure transmission efficiency；
(5) the thicker reservoir of hydrate reservoir；
(6) from side, bottom aquifer position farther out or boundless bottom water hydrate reservoir.
The beneficial effects of the invention are as follows：
Multiple-limb hole effectively increases decomposition of hydrate face, and multiple-limb hole forms the high speed bilateral of pressure transmission with main borehole
Road, reduces bottom-hole pressure drawdown amplitude under the conditions of certain capacity requirements, slows down formation sand production degree；Sold stowing gravel in multiple-limb hole
Rock layers, play a part of outside limited sand control, also there is certain supporting role to reservoir, and form the quick transmission channels of pressure, dredge
Logical near wellbore formation, reduces nearly well and wellbore skin coefficient, promotes the propagation of pressure wave in the earth formation, effectively maintains pit shaft complete
Property, so as to fulfill long-acting, the efficient decompression exploitation of ocean gas hydrate.
" congenital " weakness that shallow-layer hydrate reservoir is not suitable for carrying out fracturing reform is the method overcome, is efficiently solved
Lance between South China Sea gas hydrates reservoir permeability extremely low low with stratum comprehensive strength, Sand-producing Tendency in China's is serious
Shield, adopting the duration for increase hydrate runin has an important reference significance, promotes hydrate to be commercialized production technique
Development.
Brief description of the drawings
Fig. 1 is aleuritic texture reservoir hydrate multiple-limb hole finite sand control recovery method schematic diagram；
In figure, 1 --- hydrate reservoir；2 --- hydrate reservoir upper formation；3 --- hydrate reservoir understratum；
4 --- sand setting pocket；5 --- multiple-limb hole；6 --- the outer filling layer of casing；7 --- the casing with preformed hole；8-1、8-2——
Cementing concrete ring；9 --- multiple-limb hole horizontal displacement；10 --- multiple-limb pitch of holes；11 --- surface pipe.
Embodiment
The invention will be further described with reference to the accompanying drawings and examples.
As shown in Figure 1, a kind of ocean aleuritic texture reservoir gas hydrates multiple-limb hole finite sand control recovery method, including
Following steps：
(1) using 12 " conduits injection hydrate reservoir upper formation 2, and with (marine riser) sealing of surface pipe 11 top
Stratum；
(2) two, which spud in, wears hydrate reservoir 1, artificial bottom of a well about 100m below 1 bottom circle of hydrate reservoir；
(3) well head, set of the tripping in preformed hole are entered as multiple-limb hole 5 according to set demand perforate on production casing
Pipe 7, forms sand setting pocket 4 between 1 bottom circle of hydrate reservoir and artificial bottom of a well；
(4) bridge plug is beaten respectively in hydrate reservoir upper formation 2, the cementing well of hydrate reservoir understratum 3, shape
Into cementing concrete ring 8-1,8-2；
(5) downhole tool such as tripping in coiled tubing or flexible pipe, support half the circumference of the sleeve where it joins the shoulder in main borehole, at ferrule openings according to
The requirement of multiple-limb hole horizontal displacement 9, branch's pitch of holes 10 and other geometric parameters bores and opens multiple-limb hole 5；
(6) Gravel packing, the filling layer 6 outside main borehole hydrate interval casing are designed according to the basic demand of finite sand control
With pack gravel layer in multiple-limb hole 5, finite sand control is carried out；
(7) anti-flushing well, goes into operation, into substep buck stage.
Certainly, the above is only presently preferred embodiments of the present invention, it is impossible to is construed as limiting the implementation to the present invention
Example scope.The present invention is also not limited to the example above, essential scope of the those skilled in the art in the present invention
Interior made all the changes and improvements etc., should all belong in the patent covering scope of the present invention.
Claims (8)
- A kind of 1. ocean aleuritic texture reservoir gas hydrates multiple-limb hole finite sand control recovery method, it is characterised in that including Following steps：(1) main borehole bores and opens and use reserved branch hole sleeve completion；(2) bore and open multiple-limb hole, it is evenly distributed on around main borehole, in a certain angle with main borehole and align；(3) the pack gravel layer in main borehole casing periphery and multiple-limb hole, carries out finite sand control；(4) anti-flushing well, goes into operation, into substep buck stage.
- A kind of 2. ocean aleuritic texture reservoir gas hydrates multiple-limb hole finite sand control exploitation side according to claim 1 Method, it is characterised in that the main borehole is bored after evolution formula opens hydrate reservoir upper formation for brill and cemented the well, and is opening hydrate storage Crept into during layer with large scale drill bit；The main borehole passes through reservoir, and certain sand setting is stopped in artificial bottom of a well below the circle of reservoir bottom Pocket.
- 3. a kind of ocean aleuritic texture reservoir gas hydrates multiple-limb hole finite sand control according to claim 1 or 2 is opened Mining method, it is characterised in that the main borehole completion mode is specially that casing is completed, and has certain preformed hole in described sleeve pipe, Each preformed hole is the opening in multiple-limb hole, and reservoir bottom circle uses well cementing of cement between setting of casing and stratum, and Reservoir Section is not Cementing.
- A kind of 4. ocean aleuritic texture reservoir gas hydrates multiple-limb hole finite sand control exploitation side according to claim 3 Method, it is characterised in that the main borehole sleeve bottom is arranged to blind hole.
- A kind of 5. ocean aleuritic texture reservoir gas hydrates multiple-limb hole finite sand control exploitation side according to claim 1 Method, it is characterised in that bored and opened using flexible Manifold technology or other slim-hole radial well technologies in the multiple-limb hole.
- A kind of 6. ocean aleuritic texture reservoir gas hydrates multiple-limb hole finite sand control exploitation side according to claim 1 Method, it is characterised in that the gravel layer is quartz sand or artificial haydite, walnut shell.
- A kind of 7. ocean aleuritic texture reservoir gas hydrates multiple-limb hole finite sand control exploitation side according to claim 6 Method, it is characterised in that the gravel layer size ratio conventional gravel sizing method design knot that multiple-limb hole finite sand control is filled Thick 1~2 grade of fruit.
- A kind of 8. ocean aleuritic texture reservoir gas hydrates multiple-limb hole finite sand control exploitation side according to claim 1 Method, it is characterised in that determine to be suitable for the best branch pore geometry parameter group of specific hydrate reservoir by method for numerical simulation Close, wherein branched hole geometric parameter includes branched hole phase angle, branched hole inclination angle, branch's hole density, branched hole aperture and branch Hole horizontal displacement.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611024784.7A CN106761587B (en) | 2016-11-18 | 2016-11-18 | Ocean aleuritic texture reservoir gas hydrates multiple-limb hole finite sand control recovery method |
| JP2018528718A JP6542995B2 (en) | 2016-11-18 | 2017-11-14 | A limited sand control method of multi-branched holes in marine silty reservoir natural gas hydrate |
| PCT/CN2017/110790 WO2018090890A1 (en) | 2016-11-18 | 2017-11-14 | Method of limited sand control in multiple branch holes utilized in mining of natural gas hydrates from marine sand reservoir layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611024784.7A CN106761587B (en) | 2016-11-18 | 2016-11-18 | Ocean aleuritic texture reservoir gas hydrates multiple-limb hole finite sand control recovery method |
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| Publication Number | Publication Date |
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| CN106761587A CN106761587A (en) | 2017-05-31 |
| CN106761587B true CN106761587B (en) | 2018-04-20 |
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| JP (1) | JP6542995B2 (en) |
| CN (1) | CN106761587B (en) |
| WO (1) | WO2018090890A1 (en) |
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Also Published As
| Publication number | Publication date |
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| CN106761587A (en) | 2017-05-31 |
| JP6542995B2 (en) | 2019-07-10 |
| JP2018537605A (en) | 2018-12-20 |
| WO2018090890A1 (en) | 2018-05-24 |
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