CN107461175B - Method and device for reinforcing deep sea natural gas hydrate reservoir in advance - Google Patents
Method and device for reinforcing deep sea natural gas hydrate reservoir in advance Download PDFInfo
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- CN107461175B CN107461175B CN201710833083.6A CN201710833083A CN107461175B CN 107461175 B CN107461175 B CN 107461175B CN 201710833083 A CN201710833083 A CN 201710833083A CN 107461175 B CN107461175 B CN 107461175B
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- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 81
- 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 60
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 21
- 238000005553 drilling Methods 0.000 claims abstract description 17
- 238000004804 winding Methods 0.000 claims abstract description 8
- 238000005516 engineering process Methods 0.000 claims abstract description 7
- 238000010276 construction Methods 0.000 claims abstract description 3
- 239000011372 high-strength concrete Substances 0.000 claims description 7
- 239000007921 spray Substances 0.000 abstract 1
- 230000002787 reinforcement Effects 0.000 description 15
- 238000005253 cladding Methods 0.000 description 4
- 241000282414 Homo sapiens Species 0.000 description 3
- 238000007596 consolidation process Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 239000013049 sediment Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000013112 stability test Methods 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
-
- 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
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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)
- Piles And Underground Anchors (AREA)
Abstract
The invention provides a method for reinforcing a deep sea natural gas hydrate reservoir in advance, which comprises an upper covering layer and a lower covering layer, wherein a hydrate region is arranged between the upper covering layer and the lower covering layer, and the method comprises the following steps of: step 1: drilling construction from the seabed to the upper overburden layer by using a deep sea drilling technique to form a well; step 2: arranging reinforcing piles in the well, and enabling the lower ends of the reinforcing piles to extend into the lower covering layer; step 3: and (3) leading out a plurality of oil pipes from the well of the upper covering layer, forming a plurality of channels by utilizing an oil pipe directional drilling technology, enabling part of channels to drill along with the corresponding oil pipes in a winding way to a hydrate region, enabling part of channels to drill along with the corresponding oil pipes in a winding way to the lower covering layer, then injecting filling materials into the oil pipes, enabling the oil pipes to retreat along the channels, and enabling the filling materials to spray out the filling materials to form a reinforcing body in the channels, and reinforcing the natural gas hydrate reservoir structure by enabling the reinforcing body and reinforcing piles to form inner ribs of the natural gas hydrate reservoir.
Description
Technical Field
The invention relates to the technical fields of ocean resources and foundation engineering, in particular to a method for reinforcing a deep-sea natural gas hydrate reservoir in advance.
Background
The natural gas hydrate is stored in sediment pores of the covering layer in a low-temperature high-pressure environment, when the temperature is increased or the pressure is reduced, the natural gas hydrate is decomposed into gas and water mixture, and the released gas and water mixture forms overpressure in the covering layer, so that the consolidation degree of the sediment is greatly reduced. Particularly in the deep sea natural gas hydrate exploitation process, if the temperature or pressure of the natural gas hydrate in the submarine overburden exceeds the balance condition, the overpressure generated by the decomposition of the natural gas hydrate tends to affect the stability of the overburden, and further the stability of the submarine slope may be reduced to cause the occurrence of submarine landslide. The large-scale occurrence of the submarine landslide can damage submarine engineering facilities such as deep sea oil and gas drilling, oil pipelines, submarine cables and the like, and can cause tsunami, so that the safety of human lives and properties is greatly endangered.
Disclosure of Invention
In view of this, the embodiment of the invention provides a method for reinforcing a deep sea natural gas hydrate reservoir in advance to solve the problems that the natural gas hydrate reservoir is damaged and life and property of human beings are lost due to the instability of the seabed possibly caused when the deep sea natural gas hydrate is mined.
The embodiment of the invention provides a method for reinforcing a deep sea natural gas hydrate reservoir in advance, wherein the natural gas hydrate reservoir comprises an upper cover layer and a lower cover layer, a hydrate region for storing natural gas hydrate is arranged between the upper cover layer and the lower cover layer, and the method comprises the following steps of:
step 1: drilling construction from the seabed to the upper overburden using deep sea drilling techniques to form a well;
step 2: arranging a reinforcing pile in the well, so that the lower end of the reinforcing pile extends into the lower covering layer;
step 3: and (3) leading out a plurality of oil pipes from the well of the upper covering layer, forming a plurality of channels by utilizing an oil pipe directional drilling technology, enabling part of the channels to drill along with the corresponding oil pipes in a winding way to the hydrate region, enabling part of the channels to drill along with the corresponding oil pipes in a winding way to the lower covering layer, then injecting filling materials into the oil pipes, and then enabling the oil pipes to eject the filling materials along the channels while enabling the oil pipes to eject the filling materials to form a reinforcing body in the channels until the oil pipes are led out of the corresponding channels, and reinforcing the natural gas hydrate reservoir structure by enabling the reinforcing body and the reinforcing piles to form inner ribs of the natural gas hydrate reservoir.
Further, the oil pipe is a flexible pipe.
Further, the filling material is a material with permeation resistance.
Further, the filling material in the channel drilled to the hydrate region is ceramsite, and the filling material in the channel drilled to the lower covering layer is high-strength concrete.
Further, the outer side wall of the well is provided with a plurality of reinforcing body layers, two adjacent reinforcing body layers are arranged at intervals, each reinforcing body layer is provided with a plurality of reinforcing bodies, and the reinforcing bodies positioned on the same reinforcing body layer are annularly distributed on the outer side wall of the well and are divergently bent and extended to the periphery.
Further, the reinforcing piles are three, and the three reinforcing piles are parallel to each other and distributed in a triangular shape.
Further, the three reinforcing piles are in close contact with each other.
Further, the well bottom is located in a middle region of the upper overburden.
Further, the reinforcing piles are drainage piles.
The embodiment of the invention provides a device for reinforcing a deep sea natural gas hydrate reservoir in advance, wherein the natural gas hydrate reservoir comprises an upper cover layer and a lower cover layer, and a hydrate area for storing natural gas hydrate is arranged between the upper cover layer and the lower cover layer, and the device is characterized in that: the device comprises a well which is arranged on the upper covering layer, the upper end of a reinforcing pile is positioned in the well, the lower end of the reinforcing pile downwards penetrates through the hydrate area and stretches into the lower covering layer, the lower end area of the well is connected with a plurality of reinforcing bodies, part of the reinforcing bodies downwards meander to the hydrate area, and the other reinforcing bodies downwards meander to the lower covering layer.
The technical scheme provided by the embodiment of the invention has the beneficial effects that: by the method and the device for advanced reinforcement of the deep sea natural gas hydrate reservoir, the reinforcement piles and the reinforcement bodies are built in the natural gas hydrate reservoir, the upper cover layer, the hydrate region and the lower cover layer are connected to form a whole, when natural gas hydrate is decomposed, the consolidation degree of the hydrate region is reduced, and the generated acting force is borne by the upper cover layer, the hydrate region and the lower cover layer together, so that the possibility of instability of the natural gas hydrate reservoir is reduced; (2) The reinforcing piles adopt drainage piles, can play a role in reducing the damage to the permeability of the hydrate region besides the role in connecting and reinforcing.
Drawings
FIG. 1 is a schematic diagram of an apparatus for pre-consolidating a deep sea natural gas hydrate reservoir according to the present invention;
FIG. 2 is a cross-sectional view of tubing drilled into a hydrate region in an apparatus for pre-consolidating a deep sea natural gas hydrate reservoir according to the present invention;
FIG. 3 is a step diagram of a method of the present invention for pre-consolidating a deep sea natural gas hydrate reservoir.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.
The embodiment of the invention provides a device and a method for reinforcing a deep sea natural gas hydrate reservoir in advance, aiming at solving the problems that the natural gas hydrate reservoir is damaged and life and property of human beings are lost due to submarine instability possibly brought when the deep sea natural gas hydrate is mined.
Referring to fig. 1, the natural gas hydrate reservoir includes an upper cover layer 4 and a lower cover layer 5, and a hydrate region 6 for storing natural gas hydrate is arranged between the upper cover layer 4 and the lower cover layer 5. In this embodiment, the upper cover layer 4 is located at a sea depth of 1500m, the thickness of the upper cover layer 4 is 400m, the thickness of the hydrate region 6 is 200m, the temperature of the sea bottom is about 10 °, and the pressure of the sea bottom is about 15Mpa. But is not limited to the data set forth in this example.
The upper cover layer 4 is provided with a well 1, in this embodiment, the diameter of the upper end opening of the well 1 is 1.5m, and the diameter of the bottom of the well is about 0.8m. The well 1 does not penetrate the upper cover layer 4 and the well bottom is located in the upper cover layer 4 at a distance of 50m from the bottom surface of the upper cover layer 4.
An upper end of a reinforcing pile 2 is located in the well 1, while a lower end thereof passes downwardly through the hydrate zone 6 and extends into the lower overburden 5, the reinforcing pile 2 being a drainage pile which, in addition to serving to connect the upper overburden 4 with the lower overburden 5 to strengthen the natural gas hydrate reservoir, also serves to reduce damage to the permeability of the hydrate zone 6.
Referring to fig. 1 and 2, a plurality of reinforcing bodies 31, 32 are connected to the lower end region of the well 1, a part of the reinforcing bodies 31 meander downwards to the hydrate region 6, and a part of the reinforcing bodies 32 meander downwards to the lower cover layer 5. The building material of the reinforcement 31 is mainly ceramsite, and the building material of the reinforcement 32 is mainly high-strength concrete. The ceramsite 7 is a material with excellent permeation resistance, the high-strength concrete is C60 high-strength concrete, and the C60 high-strength concrete has the advantages of high permeation resistance, light dead weight, good compactness and the like. The ceramic grains 7 are injected into the channel through the oil pipe or the high-strength concrete is injected into the channel to form the reinforcing bodies 31 and 32, so that not only is the penetration channel increased, but also the strength of the channel is increased on the premise that the flexibility of the oil pipe is not affected. Preferably, the diameter of the ceramsite 7 is 1cm.
The reinforcement 31, 32 is bent from the well 1 at an angle α of 10 ° or more α of 20 ° or less, preferably α=15°. The outer side wall of the well 1 is provided with a plurality of reinforcement layers, two adjacent reinforcement layers are arranged at intervals, and in the embodiment, the large interval between the two adjacent reinforcement layers is 20m. Each reinforcement layer is provided with a plurality of reinforcements 31 and 32, the plurality of reinforcements 31 and 32 positioned on the same reinforcement layer are annularly distributed on the outer side wall of the well 1 and are divergently and circumferentially bent and extended, so that the reinforcements are in contact with the natural gas hydrate in the hydrate region 6 and the lower cover layer 6 like tree roots, namely, the natural gas hydrate storage layer is firmer by using a land side slope treatment technology.
The reinforcing piles 2 are three, three reinforcing piles 2 are parallel to each other, and simultaneously three reinforcing piles 2 are in close contact with each other in pairs, so that three reinforcing piles 2 are distributed in a stable triangle, and in the embodiment, the reinforcing piles 2 are 300m long, and the diameter of the reinforcing piles is 0.3m.
Referring to fig. 3, an embodiment of the present invention provides a method for advanced reinforcement of a deep sea natural gas hydrate reservoir, comprising the following steps:
step 1: the well 1 is formed by drilling a well from the seabed to the overburden 4 using deep sea drilling techniques. Due to the complex deep sea sediment and high drilling difficulty, the multi-layer casing drilling technology is adopted, and the 5-layer casing drilling technology is preferably adopted to implement the drilling operation.
Step 2: reinforcing piles 2 are arranged in the wells 1 of the upper cladding 4 such that the lower ends of the reinforcing piles 2 extend into the lower cladding 5. So as to preliminarily connect the upper cladding 4 and the lower cladding 5 into a whole, and the reinforcing piles 2 are the integral inner ribs with reinforcing effect.
Step 3: and (3) leading out a plurality of oil pipes from the well 1 of the upper cover layer 4, forming a plurality of channels by utilizing an oil pipe directional drilling technology, enabling part of the channels 31 to drill along with the corresponding oil pipes in a winding way to the hydrate region 6, enabling part of the channels 32 to drill along with the corresponding oil pipes in a winding way to the lower cover layer 5, then injecting filling materials into the oil pipes, and enabling the oil pipes to eject the filling materials along the channels while enabling the oil pipes to eject the filling materials to form reinforcing bodies 31 and 32 in the channels until the oil pipes are led out of the corresponding channels, and reinforcing the natural gas hydrate reservoir structure by enabling the reinforcing bodies 31 and 32 and the reinforcing piles 2 to form inner ribs of the natural gas hydrate reservoir. And then carrying out stability test of the natural gas hydrate reservoir, and then carrying out other works such as pre-exploitation and the like. Preferably the tubing is flexible tubing.
The technical scheme provided by the embodiment of the invention has the beneficial effects that: by the method and the device for reinforcing the deep sea natural gas hydrate reservoir in advance, the reinforcing piles and the oil pipes are built in the natural gas hydrate reservoir, the upper cover layer, the hydrate region and the lower cover layer are connected into a whole, when natural gas hydrate is decomposed, the consolidation degree of the hydrate region is reduced, and the generated acting force is borne by the upper cover layer, the hydrate region and the lower cover layer together, so that the possibility of instability of the natural gas hydrate reservoir is reduced; (2) The reinforcing piles adopt drainage piles, can play a role in reducing the damage to the permeability of the hydrate region besides the role in connecting and reinforcing.
In this document, terms such as front, rear, upper, lower, etc. are defined with respect to the positions of the components in the drawings and with respect to each other, for clarity and convenience in expressing the technical solution. It should be understood that the use of such orientation terms should not limit the scope of the protection sought herein.
The embodiments described above and features of the embodiments herein may be combined with each other without conflict.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (9)
1. A method of pre-consolidating a deep sea natural gas hydrate reservoir, the natural gas hydrate reservoir comprising an upper overburden and a lower overburden, the upper overburden and the lower overburden being therebetween a hydrate zone for storing natural gas hydrate, wherein the method is operated with a means of pre-consolidating a deep sea natural gas hydrate reservoir, the means of pre-consolidating a deep sea natural gas hydrate reservoir comprising a well open in the upper overburden, an upper end of a reinforcing pile being located in the well and a lower end of a reinforcing pile extending downwardly through the hydrate zone and into the lower overburden, a lower end of the well being connected with a plurality of reinforcing bodies, a portion of the reinforcing bodies being sinuously bored down to the hydrate zone, a portion of the reinforcing bodies being sinuous bored down to the lower overburden, the method comprising the steps of:
step 1: drilling construction from the seabed to the upper overburden using deep sea drilling techniques to form a well;
step 2: arranging a reinforcing pile in the well, so that the lower end of the reinforcing pile extends into the lower covering layer;
step 3: and (3) leading out a plurality of oil pipes from the well of the upper covering layer, forming a plurality of channels by utilizing an oil pipe directional drilling technology, enabling part of the channels to drill along with the corresponding oil pipes in a winding way to the hydrate region, enabling part of the channels to drill along with the corresponding oil pipes in a winding way to the lower covering layer, then injecting filling materials into the oil pipes, and then enabling the oil pipes to eject the filling materials along the channels while enabling the oil pipes to eject the filling materials to form a reinforcing body in the channels until the oil pipes are led out of the corresponding channels, and reinforcing the structure of the natural gas hydrate reservoir by enabling the reinforcing body and the reinforcing piles to form inner ribs of the natural gas hydrate reservoir.
2. The method of pre-consolidating a deep sea natural gas hydrate reservoir as set forth in claim 1, wherein: the oil pipe is a flexible pipe.
3. The method of pre-consolidating a deep sea natural gas hydrate reservoir as set forth in claim 1, wherein: the filling material is a material with permeation resistance.
4. A method of pre-consolidating a deep sea natural gas hydrate reservoir as set forth in claim 3, wherein: the filling material in the channel drilled to the hydrate region is ceramsite, and the filling material in the channel drilled to the lower covering layer is high-strength concrete.
5. The method of pre-consolidating a deep sea natural gas hydrate reservoir as set forth in claim 1, wherein: the outer side wall of the well is provided with a plurality of reinforcing body layers in a distributed mode, two adjacent reinforcing body layers are arranged at intervals, each reinforcing body layer is provided with a plurality of reinforcing bodies, and the reinforcing bodies located on the same reinforcing body layer are annularly distributed on the outer side wall of the well and are in a divergent mode and extend to the periphery in a bent mode.
6. The method of pre-consolidating a deep sea natural gas hydrate reservoir as set forth in claim 1, wherein: the reinforcing piles are parallel to each other and distributed in a triangular shape.
7. The method of pre-consolidating a deep sea natural gas hydrate reservoir as set forth in claim 6, wherein: and the three reinforcing piles are closely contacted with each other.
8. The method of pre-consolidating a deep sea natural gas hydrate reservoir as set forth in claim 1, wherein: the well bottom is located in the middle region of the upper overburden.
9. The method of pre-consolidating a deep sea natural gas hydrate reservoir as set forth in claim 1, wherein: the reinforcing piles are drainage piles.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710833083.6A CN107461175B (en) | 2017-09-15 | 2017-09-15 | Method and device for reinforcing deep sea natural gas hydrate reservoir in advance |
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| CN201710833083.6A CN107461175B (en) | 2017-09-15 | 2017-09-15 | Method and device for reinforcing deep sea natural gas hydrate reservoir in advance |
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| CN107461175B true CN107461175B (en) | 2023-06-30 |
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| CN1587640A (en) * | 2004-09-21 | 2005-03-02 | 中国科学院广州能源研究所 | Method and device for sea natural gas hydrate production and drilling |
| CN1944950A (en) * | 2006-08-09 | 2007-04-11 | 中国石油大学(华东) | Method for recovering sea bottom hydrate by underwell gas and water separation and back injection |
| DE102010031352A1 (en) * | 2010-06-02 | 2011-12-08 | Steffen Ulbrich | Sealing unit for sealing mineral oil-borehole in seabed in large water depth, has bubble cap arranged on seabed, and safety valve arranged at penetration point of pipe for closing pipe, where cap has inner area with inlet and outlet valves |
| RU138686U1 (en) * | 2013-10-21 | 2014-03-20 | Андрей Геннадьевич Цыденов | INSTALLATION FOR PRODUCING NATURAL GAS FROM UNDERWATER GAS HYDRATES |
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| US7546880B2 (en) * | 2006-12-12 | 2009-06-16 | The University Of Tulsa | Extracting gas hydrates from marine sediments |
| US9896902B2 (en) * | 2012-05-25 | 2018-02-20 | Exxonmobil Upstream Research Company | Injecting a hydrate slurry into a reservoir |
| RU2543389C1 (en) * | 2013-09-09 | 2015-02-27 | Закрытое Акционерное Общество "Дальневосточный Научно-Исследовательский Проектный Институт Нефти И Газа" (Зао "Двнипи-Нефтегаз") | Development method of underwater gas-hydrate deposits |
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