CN105464634A - Method for exploiting methane hydrate by using stored carbon dioxide - Google Patents
Method for exploiting methane hydrate by using stored carbon dioxide Download PDFInfo
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- CN105464634A CN105464634A CN201510933048.2A CN201510933048A CN105464634A CN 105464634 A CN105464634 A CN 105464634A CN 201510933048 A CN201510933048 A CN 201510933048A CN 105464634 A CN105464634 A CN 105464634A
- Authority
- CN
- China
- Prior art keywords
- carbon dioxide
- methane
- methane hydrate
- soil layer
- hydrate
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 190
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 96
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 96
- 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 82
- 238000000034 method Methods 0.000 title claims abstract description 28
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 68
- 239000002689 soil Substances 0.000 claims abstract description 54
- 238000002347 injection Methods 0.000 claims abstract description 52
- 239000007924 injection Substances 0.000 claims abstract description 52
- 238000006073 displacement reaction Methods 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 230000035699 permeability Effects 0.000 claims description 19
- 238000011084 recovery Methods 0.000 claims description 9
- 239000013535 sea water Substances 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 3
- 238000002513 implantation Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 17
- 239000005431 greenhouse gas Substances 0.000 abstract description 2
- 239000012466 permeate Substances 0.000 abstract 1
- 238000005065 mining Methods 0.000 description 5
- VTVVPPOHYJJIJR-UHFFFAOYSA-N carbon dioxide;hydrate Chemical compound O.O=C=O VTVVPPOHYJJIJR-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- -1 Canadian Chemical compound 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/01—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
Landscapes
- 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)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention provides a method for exploiting methane hydrate by using stored carbon dioxide. The method comprises the following steps: selecting a methane hydrate soil layer at proper depth in a seabed, according to geological information, setting up a carbon dioxide injection well communicating from an ocean platform to the methane hydrate soil layer; injecting liquid state carbon dioxide into the carbon dioxide injection well, after the liquid state carbon dioxide diffuses and permeates into the methane hydrate soil layer, the liquid state carbon dioxide replaces with the methane hydrate, to generate methane gas; according to displacement efficiency of the carbon dioxide and the methane hydrate, determining exploitation time, and setting up a methane exploited well in the replacement range of the carbon dioxide injection well, the methane exploited well communicating with the methane hydrate soil layer, so as to realize exploitation of methane gas. After the carbon dioxide is injected and stored, the carbon dioxide would replace the methane hydrate in the regions in a permeating and flowing process, mechanical property variation of the stratum in the process is little, and geological disasters caused by air exhaust exploitation of the methane hydrate are prevented, and greenhouse gases are reduced.
Description
Technical field
The present invention relates to deep-sea resources exploitation field, particularly relating to a kind of by burying carbon dioxide to replace the method for minable methane gas to submarine methane hydrate soil layer.
Background technology
Under current exploitation sea in methane hydrate soil layer methane gas Oil/gas Well step-down mining type and heating mining type, confirm that its efficiency can not meet commercialization mining requirement through the U.S., Japan and the tentative exploitation of the international methane hydrate such as Canadian, can cause again the disadvantageous geology of the mankind and environmental effect.Therefore, need the economy, the Technology of Safety Mining that propose new methane hydrate, the commercialization for methane hydrate utilizes and provides technological reserve.
Summary of the invention
The object of the invention is to provide a kind of method of exploiting methane gas in hydrate layer under sea bed, to avoid direct mining type, geology is damaged.
Especially, the invention provides a kind of method that carbon dioxide exploitation methane hydrate is buried in utilization, comprise the steps:
Step 101, the methane hydrate soil layer of Suitable depth under selection sea bed, then the carbon dioxide injection well being communicated to methane hydrate soil layer by ocean platform is established according to geology information frame;
Step 102, injects liquid carbon dioxide in carbon dioxide injection well, and liquid carbon dioxide spreads and after seepage flow, produces replace and produce methane gas with methane hydrate in methane hydrate soil layer;
Step 103, according to the displacement efficiency of carbon dioxide and methane hydrate, determines recovery time, and then within the scope of the displacement of carbon dioxide injection well, the methane recovery well of methane hydrate soil layer is led in erection, realizes the exploitation of methane gas.
Further, the horizontal well extended in the horizontal direction is set in the bottom of described carbon dioxide injection well.
Further, described horizontal well is positioned at the bottom of described methane hydrate soil layer, and on well bore, is provided with multiple carbon dioxide that facilitates externally spreads the through hole with seepage flow.
Further, described the sea water advanced of methane hydrate soil layer place is at least greater than 800 meters.
Further, described geological information comprises the methane hydrate content of described methane hydrate soil layer, permeability, moisture content, degree of porosity, mechanics rigidity and intensity, pore liquid pressure and temperature parameter.
Further, when setting up described carbon dioxide injection well, according to described geological information determination carbon dioxide injection speed, injection length, injection pressure and implantation temperature.
Further, the injection rate Q of carbon dioxide adopts following formula to determine:
Q＝π·x
2·L/2
Wherein, L is the length of horizontal well, and x is the length of carbon dioxide injection well.
Further, the length x of described carbon dioxide injection well adopts following formula to determine:
Wherein, k
efor methane hydrate soil layer permeability, φ
efor methane hydrate soil layer degree of porosity, μ are carbon dioxide viscosity factor, c
tfor stratum compressible coefficient, t is the carbon dioxide injection time.
Further, in described step 103, in exploitation methane gas process, need the displacement situation according to carbon dioxide and methane hydrate, determine the permeability of carbon dioxide at methane hydrate soil layer, and then the injection rate of adjustment carbon dioxide, with the exploitation rate of equilibrium methane gas and formation speed, carbon dioxide is at the permeability k of described methane hydrate soil layer
ecemploying following formula calculates:
Wherein, k
efor methane hydrate soil layer permeability, Δ S
hfor the changing value of hydrate concentration, S
hfor hydrate concentration, N is the decline index that hydrate soil layer permeability increases with hydrate concentration.
Further, described methane hydrate soil layer is by the effective drainage porosity after carbon dioxide replacement
employing following formula calculates:
Wherein, φ
efor methane hydrate soil layer degree of porosity.
After carbon dioxide injection is buried by the present invention, by the decades of seepage flow certain limit in hydrate formation, carbon dioxide can replace the methane hydrate in these regions in flow event, thus obtain the methane gas of free state, directly methane gas exploitation can be carried out after accumulating decades, in this process, the change of mechanical property on stratum is little, methane hydrate can be avoided to bleed and exploit the geological disaster that causes, reduce greenhouse gases simultaneously.
Accompanying drawing explanation
Fig. 1 is method flow schematic diagram according to an embodiment of the invention;
Fig. 2 be according to an embodiment of the invention carbon dioxide injection and exploitation schematic diagram;
In figure: the upper overburden layer of 10-sea water layer, 20-, 30-hydrate layer, 40-carbon dioxide injection well, 50-methane recovery well, 60-horizontal well, 61-through hole.
Detailed description of the invention
As shown in Figure 1, one embodiment of the invention discloses the method implementation process that carbon dioxide exploitation methane hydrate is buried in a kind of utilization.Soil below sea water layer 10 is generally divided into the upper overburden layer 20 on upper strata, and the hydrate layer 20 of lower floor, and this hydrate layer can because form corresponding hydrate layer, as methane hydrate layer containing different minerals matter.The present embodiment adopts the mode of displacement that the methane in methane hydrate is become gas, then exploit, thus reduce the infringement to geology.The method generally comprises following steps:
Step 101, the methane hydrate soil layer of Suitable depth under selection sea bed, then the carbon dioxide injection well being communicated to methane hydrate soil layer by ocean platform is established according to geology information frame;
In the present embodiment, sea water layer 10 degree of depth at this methane hydrate soil layer place is generally greater than 800 meters.Before erection carbon dioxide injection well 40, first obtain the geological informations such as the methane hydrate content of current methane hydrate soil layer, permeability, moisture content, degree of porosity, mechanics rigidity and intensity, pore liquid pressure and temperature parameter according to geophysical exploration, geological drilling data.
For improving the replacement result of carbon dioxide, the horizontal well 60 extended along methane hydrate layer horizontal direction can be set in the bottom of carbon dioxide injection well 40, horizontal well 60 for vertically connecting carbon dioxide injection well 40, so that the carbon dioxide of injection is delivered to farther place.The position of horizontal well 60 can be in the bottommost of methane hydrate layer, spreads upward to facilitate carbon dioxide.Further, for accelerating the mass rate of emission of carbon dioxide, multiple through hole 61 towards different directions can be set on the well bore of horizontal well 60.
Wherein, the injection rate Q of carbon dioxide adopts following formula to determine:
Q＝π·x
2·L/2
In formula, L is the length of horizontal well 60, and x is the length of carbon dioxide injection well 40.
The length x of carbon dioxide injection well 40 adopts following formula to determine:
In formula, k
efor methane hydrate soil layer permeability, φ
efor methane hydrate soil layer degree of porosity, μ are carbon dioxide viscosity factor, c
tfor stratum compressible coefficient, t is the carbon dioxide injection time.
The basis of above-mentioned geological information is determined the carbon dioxide injection speed of the carbon dioxide injection well 40 set up, injection length length, and the parameter such as injection pressure and implantation temperature.
Step 102, injects liquid carbon dioxide in carbon dioxide injection well, and liquid carbon dioxide spreads and after seepage flow, produces replace and produce methane gas with methane hydrate in methane hydrate soil layer.
After carbon dioxide enters methane hydrate soil layer, can replace with the methane in methane hydrate, thus generate carbon dioxide hydrate, meanwhile, the methane after displacement is stored in formation pore with free gaseous state.
Step 103, according to the displacement efficiency of carbon dioxide and methane hydrate, determines recovery time, and then within the scope of the displacement of carbon dioxide injection well, the methane recovery well of methane hydrate soil layer is led in erection, realizes the exploitation of methane gas.
Displacement efficiency in this step, needs to determine according to information such as the permeability of carbon dioxide and displacement efficiencies, more whether reach according to the methane-generated quantity in displacement efficiency determination methane hydrate soil layer can for the standard of exploitation.Methane recovery well 50 can be erected at the penetration range limit formed with carbon dioxide injection well 40 or horizontal well 60, to collect the methane gas be extruded from periphery.According to the methane distribution information of stratum monitoring information display, the methane recovery well 50 at diverse location place, multiple office can be set up.
In addition, in this step, also need to consider, along with progressively infiltration and the displacement of carbon dioxide, the permeability of methane hydrate soil layer and porosity also can change, and therefore the exploitation rate of carbon dioxide injection speed and methane also needs to adjust accordingly.
Wherein, carbon dioxide is at the permeability k of methane hydrate soil layer
ecemploying following formula calculates:
In formula, Δ S
hfor the changing value of hydrate concentration, S
hfor hydrate concentration, N is the decline index that hydrate soil layer permeability increases with hydrate concentration.
Methane hydrate soil layer is by the effective drainage porosity after carbon dioxide replacement
employing following formula calculates:
In formula, Δ S
hfor the changing value of hydrate concentration, S
hfor hydrate concentration.
According to method of the present invention: horizontal well 60 length 1000m, the injecting carbon dioxide time is 20 years, and methane hydrate soil layer hydrate concentration is 50%, effective permeability 10
-17m
2for, effecive porosity is 20%, and the length of carbon dioxide seepage flow front end distance pit shaft is about 160m, injects liquid carbon dioxide injection amount and is about 8 × 10
7m
6.For 20 years, carbon dioxide seepage flow to methane hydrate soil layer in, the methane in hydrate cements out by carbon dioxide, and generate carbon dioxide hydrate, so in stratum, hydrate has two kinds, and one is remaining methane hydrate after displacement, and two is hydrates that carbon dioxide generates.Along the distribution of depth of stratum, determine the concentration of free methane by methane concentration in monitoring stratum, reach the index of exploitation economy in concentration after, select mined bed, adopt the method for carbon dioxide flooding, exploitation free methane gas.
In the present invention, multiple carbon dioxide injection well 40 can be beaten according to geological information in same methane hydrate soil layer region simultaneously.In addition, a carbon dioxide injection well 40 also can connect towards multiple horizontal wells 60 of different directions simultaneously.
So far, those skilled in the art will recognize that, although multiple exemplary embodiment of the present invention is illustrate and described herein detailed, but, without departing from the spirit and scope of the present invention, still can directly determine or derive other modification many or amendment of meeting the principle of the invention according to content disclosed by the invention.Therefore, scope of the present invention should be understood and regard as and cover all these other modification or amendments.
Claims (10)
1. a method for carbon dioxide exploitation methane hydrate is buried in utilization, it is characterized in that, comprises the steps:
Step 101, the methane hydrate soil layer of Suitable depth under selection sea bed, then the carbon dioxide injection well being communicated to methane hydrate soil layer by ocean platform is established according to geology information frame;
Step 102, injects liquid carbon dioxide in carbon dioxide injection well, and liquid carbon dioxide spreads and after seepage flow, produces replace and produce methane gas with methane hydrate in methane hydrate soil layer;
Step 103, according to the displacement efficiency of carbon dioxide and methane hydrate, determines recovery time, and then within the scope of the displacement of carbon dioxide injection well, the methane recovery well of methane hydrate soil layer is led in erection, realizes the exploitation of methane gas.
2. method according to claim 1, is characterized in that,
The horizontal well extended in the horizontal direction is set in the bottom of described carbon dioxide injection well.
3. method according to claim 2, is characterized in that,
Described horizontal well is positioned at the bottom of described methane hydrate soil layer, and on well bore, is provided with multiple carbon dioxide that facilitates externally spreads the through hole with seepage flow.
4. method according to claim 1, is characterized in that,
Described the sea water advanced of methane hydrate soil layer place is at least greater than 800 meters.
5. method according to claim 1, is characterized in that,
Described geological information comprises the methane hydrate content of described methane hydrate soil layer, permeability, moisture content, degree of porosity, mechanics rigidity and intensity, pore liquid pressure and temperature parameter.
6. method according to claim 5, is characterized in that,
When setting up described carbon dioxide injection well, according to described geological information determination carbon dioxide injection speed, injection length, injection pressure and implantation temperature.
7. method according to claim 5, is characterized in that,
The injection rate Q of carbon dioxide adopts following formula to determine:
Q＝π·x
2·L/2
Wherein, L is the length of horizontal well, and x is the length of carbon dioxide injection well.
8. method according to claim 7, is characterized in that,
The length x of described carbon dioxide injection well adopts following formula to determine:
Wherein, k
efor methane hydrate soil layer permeability, φ
efor methane hydrate soil layer degree of porosity, μ are carbon dioxide viscosity factor, c
tfor stratum compressible coefficient, t is the carbon dioxide injection time.
9. method according to claim 1, is characterized in that,
In described step 103, in exploitation methane gas process, need the displacement situation according to carbon dioxide and methane hydrate, determine the permeability of carbon dioxide at methane hydrate soil layer, and then the injection rate of adjustment carbon dioxide, with the exploitation rate of equilibrium methane gas and formation speed, carbon dioxide is at the permeability k of described methane hydrate soil layer
ecemploying following formula calculates:
Wherein, k
efor methane hydrate soil layer permeability, Δ S
hfor the changing value of hydrate concentration, S
hfor hydrate concentration, N is the decline index that hydrate soil layer permeability increases with hydrate concentration.
10. method according to claim 9, is characterized in that,
Described methane hydrate soil layer is by the effective drainage porosity after carbon dioxide replacement
employing following formula calculates:
Wherein, φ
efor methane hydrate soil layer degree of porosity.
Priority Applications (1)
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| CN201510933048.2A CN105464634A (en) | 2015-12-15 | 2015-12-15 | Method for exploiting methane hydrate by using stored carbon dioxide |
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| CN201510933048.2A CN105464634A (en) | 2015-12-15 | 2015-12-15 | Method for exploiting methane hydrate by using stored carbon dioxide |
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Cited By (7)
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| CN106437653A (en) * | 2016-09-27 | 2017-02-22 | 大连理工大学 | Method for jointly exploiting hydrates and hermetically storing carbon dioxide by aid of quicklime and carbon dioxide injection processes |
| CN106677745A (en) * | 2016-12-02 | 2017-05-17 | 中国石油大学(华东) | Process method combining natural gas hydrate depressurizing development with CO2 storage |
| CN106896836A (en) * | 2017-01-09 | 2017-06-27 | 神华集团有限责任公司 | Control of injection pressure method and device |
| CN107083943A (en) * | 2017-06-01 | 2017-08-22 | 中国石油大学(华东) | A kind of hot CO of segment level well2The method that the heterogeneous hydrate of exploitation of handling up is hidden |
| CN108179996A (en) * | 2017-08-03 | 2018-06-19 | 中山大学 | A kind of method that liquid carbon dioxide replaces gas hydrates in situ |
| CN108868706A (en) * | 2018-06-06 | 2018-11-23 | 中国矿业大学 | Directional drilling supercritical carbon dioxide fracturing replacement exploitation of gas hydrate method |
| CN111022000A (en) * | 2019-03-04 | 2020-04-17 | 深圳市弘毅海洋智能装备有限公司 | Combustible ice mining method |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106437653A (en) * | 2016-09-27 | 2017-02-22 | 大连理工大学 | Method for jointly exploiting hydrates and hermetically storing carbon dioxide by aid of quicklime and carbon dioxide injection processes |
| CN106437653B (en) * | 2016-09-27 | 2018-07-20 | 大连理工大学 | A kind of hydrate exploitation and the carbon dioxide sequestration integrated processes of note quick lime and carbon dioxide process |
| CN106677745A (en) * | 2016-12-02 | 2017-05-17 | 中国石油大学(华东) | Process method combining natural gas hydrate depressurizing development with CO2 storage |
| CN106677745B (en) * | 2016-12-02 | 2018-10-12 | 中国石油大学(华东) | A kind of gas hydrates decompression exploitation and CO2Bury the process of combination |
| CN106896836A (en) * | 2017-01-09 | 2017-06-27 | 神华集团有限责任公司 | Control of injection pressure method and device |
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| CN108179996A (en) * | 2017-08-03 | 2018-06-19 | 中山大学 | A kind of method that liquid carbon dioxide replaces gas hydrates in situ |
| CN108868706A (en) * | 2018-06-06 | 2018-11-23 | 中国矿业大学 | Directional drilling supercritical carbon dioxide fracturing replacement exploitation of gas hydrate method |
| CN111022000A (en) * | 2019-03-04 | 2020-04-17 | 深圳市弘毅海洋智能装备有限公司 | Combustible ice mining method |
| CN111022000B (en) * | 2019-03-04 | 2022-01-07 | 深圳市弘毅海洋智能装备有限公司 | Combustible ice mining method |
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