CN114562237B - Deep sea natural gas hydrate strip zone mining method - Google Patents
Deep sea natural gas hydrate strip zone mining method Download PDFInfo
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- CN114562237B CN114562237B CN202210185932.2A CN202210185932A CN114562237B CN 114562237 B CN114562237 B CN 114562237B CN 202210185932 A CN202210185932 A CN 202210185932A CN 114562237 B CN114562237 B CN 114562237B
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- 238000005065 mining Methods 0.000 title claims abstract description 186
- 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 46
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 claims abstract description 45
- 239000007789 gas Substances 0.000 claims abstract description 12
- 238000010276 construction Methods 0.000 claims abstract description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 35
- 238000011084 recovery Methods 0.000 claims description 32
- 239000003345 natural gas Substances 0.000 claims description 16
- 238000000354 decomposition reaction Methods 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 10
- 239000013535 sea water Substances 0.000 claims description 9
- 239000012530 fluid Substances 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 230000035699 permeability Effects 0.000 claims description 7
- 238000005553 drilling Methods 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 4
- 230000000750 progressive effect Effects 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims 6
- 230000008901 benefit Effects 0.000 abstract description 6
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- -1 Natural gas hydrates Chemical class 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 230000003449 preventive effect Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimizing the spacing of wells comprising at least one inclined or horizontal well
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/70—Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells
Abstract
The invention discloses a deep sea natural gas hydrate strip zone mining method, which adopts a horizontal well and vertical well combined arrangement mode, and establishes a strip mining zone by taking a main force well as a center; the two-side mining blocks can be selected to be simultaneously mined or single-side alternate mining according to the productivity requirement, and the same-side mining blocks can also be selected to be simultaneously mined or alternate mining at intervals according to the productivity requirement; the method has the advantages of clear design thought, simple and easy operation construction method, and can effectively improve the exploitation efficiency of the deep sea natural gas hydrate and ensure the gas production efficiency of a single well.
Description
Technical Field
The invention relates to a deep sea hydrate mining method, in particular to a deep sea natural gas hydrate strip zone mining method.
Background
The natural gas hydrate is an ice-like cage-shaped crystalline compound formed by natural gas and water under low-temperature and high-pressure conditions, is widely distributed in deep water strata such as high-latitude polar frozen earth strata, ocean lakes and the like, has the characteristics of large reserve, high energy density and the like, and is considered as a potential energy source. The energy density of methane (the volume of methane per unit rock volume under standard conditions) is 10 times that of coal and black shale, and 2.5 times that of natural gas.
Natural gas hydrates are widely distributed in nature in the deep water environment of continents, islands, rising areas of active and passive continents edges, polar continents frames, and oceans and some inland lakes. The formation conditions of natural gas hydrate: low temperature, typically below 10 ℃; high pressure, typically above 10MPa; a sufficient source of natural gas (hydrocarbons, primarily methane); advantageous hydrate formation spaces.
As natural gas hydrate is mainly distributed in loose particle pores with smaller permeability coefficient of the submarine weakly cemented non-diagenetic rock, the existing test exploitation report can show that the existing exploitation method has low exploitation efficiency and cannot achieve the production conditions of commercial exploitation, the exploitation efficiency is improved by changing the arrangement of the existing exploitation wells, and meanwhile, the expense of well pattern arrangement is also considered to be reduced as much as possible; when the reservoir is shallow in burial or poor in stratum stability, the mining area is reasonably divided, and the well bore arrangement mode is optimized so as to achieve the purpose of reducing the influence on the overlying stratum caused by the decomposition of natural gas hydrate in the pores as much as possible. Thus, there is a need for an effective industrial production method that can improve the production efficiency of deep sea natural gas hydrates and effectively control the deformation of the subsea strata due to the production of natural gas hydrates.
Disclosure of Invention
The invention aims to provide a deep sea natural gas hydrate strip zone mining method, which aims to solve the problems of low mining efficiency of natural gas hydrate in the sea area and reduced deformation of a submarine stratum caused by natural gas hydrate mining and improve the mining efficiency of the deep sea natural gas hydrate.
In order to achieve the above object, the present invention provides the following solutions:
a deep sea natural gas hydrate strip zone mining method comprises the following steps:
s1: determining a region where the natural gas hydrate is located, and analyzing stratum permeability coefficient, stratum temperature and particle grading geological parameters of the natural gas hydrate in the region;
s2: determining the drilling position in the area, and setting up an offshore production platform; the offshore mining platform penetrates through the covering layer through the main vertical shaft and stretches into the area;
s3: determining a mining pushing mode and the length of a mining block, and symmetrically arranging strip mining areas in the area by taking the main vertical shaft as a center;
s4: completing a drilling construction process of a mining vertical well in the strip mining area and installing a mining device, a sand control device and a pipeline;
s5: determining the recovery mode of the strip mining area, and selecting the mining mode;
s6: and when the gas production of the mining area in the strip mining area is reduced, switching the mining area in the strip mining area to perform mining work of the non-mining area.
In the second step, the covering layer is positioned below the sea water layer; the main vertical shaft penetrates through the covering layer and is arranged at the design horizon.
The design horizon is the upper and lower boundary position of the natural gas hydrate reservoir.
The strip production zone comprises an upper recovery horizontal well, a lower energy supply horizontal well and a production vertical well; the upper recovery horizontal well and the lower energy supply horizontal well are respectively arranged at the upper boundary and the lower boundary of the natural gas hydrate reservoir.
And step five, the mining mode is depressurization mining or heat injection mining.
The depressurization exploitation is specifically to depressurize the surrounding of the exploitation vertical shaft through the lower energy supply horizontal shaft, and natural gas generated by decomposition is conveyed to the offshore exploitation platform through the upper recovery horizontal shaft and the main vertical shaft.
The heat injection exploitation mode specifically comprises the steps of injecting high-temperature fluid into the exploitation vertical shaft through the lower energy supply horizontal shaft, and performing well sealing; and natural gas generated by decomposition is conveyed to the offshore exploitation platform through the upper recovery horizontal well and the main vertical well.
And fifthly, the recovery sequence is that the strip mining area takes the main force well as the center, two sides of the mining area simultaneously and sequentially advance and mine, two sides of the mining area simultaneously and sequentially retreat and mine, two sides of the mining area simultaneously and alternately advance and mine, two sides of the mining area simultaneously and alternately retreat and mine, one side of the mining area alternately and sequentially advance and mine, one side of the mining area alternately and sequentially retreat and mine, one side of the mining area alternately and alternately advances and mine or one side of the mining area alternately and alternately retreats and mine.
The progressive exploitation is orderly exploited from the exploitation vertical shaft to a direction away from the main vertical shaft gradually; the backward exploitation is to exploit from the exploitation vertical shaft gradually to the direction close to the main vertical shaft.
The mining length of the strip mining area is not less than 20m.
The invention has the following technical effects: according to the invention, by adopting a combined arrangement mode of the horizontal well and the vertical well, the strip exploitation blocks are symmetrically arranged left and right by taking the main vertical well as the center, the strip exploitation blocks consist of the lower energy supply horizontal well, the exploitation vertical well, the upper recovery horizontal well and the main vertical well, the exploitation blocks on two sides can be selected to be exploited simultaneously or exploited alternately on one side according to the productivity requirement, and the exploitation blocks on the same side can also be selected to be exploited simultaneously or exploited alternately at intervals according to the productivity requirement, so that the stability and the stress uniformity of a shaft are ensured. The deep sea natural gas hydrate strip zone mining method has the advantages of clear design thought, simple and easy operation of a construction method, effective improvement of the deep sea natural gas hydrate mining efficiency, guarantee of single well gas production efficiency, provision of beneficial technical reference and guidance for realizing commercial mining of the deep sea natural gas hydrate in the early days of China, and wide popularization and application values in the technical field.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic construction diagram of a mining method of the present invention;
FIG. 2 is a schematic diagram of simultaneous interval back-off mining of two mining blocks according to the present invention;
FIG. 3 is a schematic view of two side mining blocks of the present invention simultaneously advancing at intervals;
FIG. 4 is a schematic diagram of two mining blocks simultaneously and sequentially retracting;
FIG. 5 is a schematic view of the two side mining blocks of the present invention advancing in sequence simultaneously;
FIG. 6 is a schematic diagram of the single-sided alternate sequential back-off mining of the present invention;
FIG. 7 is a schematic illustration of single-sided alternate progressive mining in accordance with the present invention;
FIG. 8 is a schematic illustration of single-sided alternate interval forward mining in accordance with the present invention;
FIG. 9 is a schematic illustration of the single-sided alternate interval back-off mining of the present invention;
in the figure, a 1-offshore mining platform; 2-a sea water layer; 3-a main vertical shaft; 4-a cover layer; 5-upper recovery horizontal well; 6-exploitation vertical shaft; 7-lowering an energy supply horizontal well; 8-natural gas hydrate reservoir; 9-lower strata; 10-mining the decomposition area.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
A deep sea natural gas hydrate strip zone mining method comprises the following steps:
s1: determining a region where the natural gas hydrate is located, and analyzing stratum permeability coefficient, stratum temperature and particle grading geological parameters of the natural gas hydrate in the region;
s2: determining the drilling position in the area and setting up an offshore production platform 1; the offshore production platform 1 penetrates through the covering layer 4 through the main vertical shaft 3 and extends into the area;
s3: determining a mining pushing mode and the length of a mining block, and symmetrically arranging strip mining areas in the area by taking the main vertical shaft 3 as the center;
s4: completing a drilling construction process of a mining vertical well in the strip mining area and installing a mining device, a sand control device and a pipeline;
s5: determining the recovery mode of the strip mining area, and selecting the mining mode;
s6: and when the gas production of the mining area in the strip mining area is reduced, switching the mining area in the strip mining area to perform mining work of the non-mining area.
In the second step, the covering layer 4 is positioned below the seawater layer 2; the main vertical shaft 3 penetrates the covering layer 4 and is arranged at the design horizon.
The design horizon is the upper and lower boundary position of the natural gas hydrate reservoir 8.
The strip production zone comprises an upper recovery horizontal well 5, a lower energy supply horizontal well 7 and a production vertical well 6; the upper recovery horizontal well 5 and the lower energy supply horizontal well 7 are respectively arranged at the upper and lower boundaries of the natural gas hydrate reservoir 8.
And step five, the mining mode is depressurization mining or heat injection mining.
The depressurization exploitation specifically comprises depressurization of the periphery of the exploitation vertical shaft 6 through the lower energy supply horizontal shaft 5, and natural gas generated by decomposition is conveyed to the offshore exploitation platform through the upper recovery horizontal shaft 7 and the main vertical shaft 3.
The heat injection exploitation mode specifically comprises the steps of injecting high-temperature fluid into the exploitation vertical shaft 6 through the lower energy supply horizontal shaft 5, and performing well sealing; natural gas produced by decomposition is conveyed to the offshore production platform through the upper recovery horizontal well 7 and the main vertical well 3.
And fifthly, the recovery sequence is that the strip mining area takes the main force well as the center, two sides of the mining area simultaneously and sequentially advance and mine, two sides of the mining area simultaneously and sequentially retreat and mine, two sides of the mining area simultaneously and alternately advance and mine, two sides of the mining area simultaneously and alternately retreat and mine, one side of the mining area alternately and sequentially advance and mine, one side of the mining area alternately and sequentially retreat and mine, one side of the mining area alternately and alternately advances and mine or one side of the mining area alternately and alternately retreats and mine.
The progressive exploitation is orderly exploited from the exploitation vertical shaft 6 gradually to a direction far from the main vertical shaft 3; the back-off production is to produce from the production vertical shaft 6 gradually to the direction approaching the main vertical shaft 3.
The mining length of the strip mining area is not less than 20m.
In one embodiment of the invention, the area where the natural gas hydrate is located is generally given to the ground of the ocean area, a covering layer 4 with mixed seawater and particle pores is mixed between a seawater layer 2 and a natural gas hydrate storage layer 8, and the bottom of the natural gas hydrate storage layer 8 is a lower stratum 9 with a deeper layer;
further, unlike the prior art, the strip production zone of the present invention is actually two production zones that are symmetrical about the main vertical shaft 3; the two exploitation areas are respectively connected by exploitation vertical shafts 6 on two sides and an upper recovery horizontal well 5 and a lower energy supply horizontal well 7 on the top and the bottom of the exploitation vertical shafts; the functions of the upper recovery horizontal well 5 and the lower energy supply horizontal well 7 are respectively used for recovery and energy supply; different from the mode of only providing one horizontal well in the prior art, the exploitation efficiency is higher through functional division, and the gas production efficiency is ensured.
Further, a sand control device is also arranged at the upper recovery horizontal well 5; the deformation and sedimentation of the submarine stratum caused by the exploitation of the natural gas hydrate are slowed down, the stability of the submarine stratum in the deep sea natural gas hydrate exploitation process can be effectively improved, and the sand production accident of a shaft caused by the exploitation of produced water is reduced.
In an embodiment of the present invention, the production demarcation zones 10 are each selected zones for actual production.
Further, the present invention determines the recovery sequence first and then selects the blocks for mining, and the specific mining sequence is illustrated in the following examples.
Embodiment one:
analyzing stratum permeability coefficient, stratum temperature and particle grading geological parameters of the region where the natural gas hydrate is located, determining sea water layer height, and being suitable for constructing the position of the main vertical shaft 3, wherein the thickness of the covering layer 4 exists, and the length range of the strip production region symmetrical to the main vertical shaft 3; the specific data is that the sea water depth is 800m, the thickness of the covering layer is 200m, and the stratum permeability coefficient is 1.5X10 -4 cm/s, formation pressure 12MPa, and average particle size of formation particles 500 μm;
constructing an offshore mining platform 1 and a main vertical shaft 3 according to the parameters; building a main vertical shaft 3, penetrating through the covering layer 4 to the height at which the covering layer 4 is connected with the natural gas hydrate reservoir 8, and extending downwards to build the natural gas hydrate reservoir 8; according to the above parameters, the sea water depth is 800m, the thickness of the covering layer is 200m, and the stratum permeability coefficient is 1.5X10 -4 cm/s, formation pressure 12MPa, and average particle size of formation particles 500 μm; the diameter of the main vertical shaft 3 is 2m, the diameters of the upper recovery horizontal shaft 5 and the lower energy supply horizontal shaft are 0.5m, the length of each side band mining area is 20m, and each mining vertical shaft is arranged every 5m by taking the main vertical shaft 3 as the center to define each mining band;
further, as shown in fig. 2, the strip production zone is produced by the production vertical shaft 6; determining the mining direction as simultaneous interval backward mining; adopting a vertical shaft and horizontal shaft combination mode, and mining a stoping zone through a mining vertical shaft 6; the concrete exploitation steps are that natural gas hydrate in a recovery area close to the side of the main vertical shaft 3 is decomposed through exploitation vertical shafts 6 at two sides at intervals in a direction from the edge close to the recovery area to the main vertical shaft 3 in a bilateral symmetry and sequential manner by taking the main vertical shaft 3 as a center;
when a depressurization exploitation method is selected, the pressure of fluid in an exploitation vertical shaft 6 is reduced, and natural gas generated by decomposition is converged into a main vertical shaft 3 through an upper recovery horizontal shaft 5 and conveyed to an exploitation platform 1; when the heat injection exploitation method is selected, high-temperature fluid is injected into the exploitation vertical shaft 6 through the lower energy supply horizontal shaft 7, the well is closed, and natural gas generated by decomposition is gathered to the main vertical shaft 3 through the upper recovery horizontal shaft 5 and is conveyed to the exploitation platform 1;
further, for the back-up exploitation, firstly, two exploitation strips on two sides of the main vertical shaft 3 close to the edge position of the strip exploitation region are exploited by utilizing the exploitation vertical shaft 6, the fluid pressure in the exploitation vertical shaft 6 of which the exploitation strips are far away from the side of the main vertical shaft 3 is reduced by the lower energy supply horizontal shaft 7, and natural gas generated by decomposition is conveyed to the offshore exploitation platform 1 through the upper recovery horizontal shaft 5 and the main vertical shaft 3.
Further, when the capacity of the two mining strips close to the mining area edge is obviously reduced and commercial mining cannot be met, the mining strips for the next operation are mined by spacing one mining strip from the mining area edge to the main vertical shaft 3, so that the settlement of the mining on the submarine stratum can be effectively reduced by spacing mining, and the mining device has a good preventive effect on mining areas which are easy to generate submarine geological disasters.
Embodiment two:
the difference between this embodiment and the first embodiment is that, as shown in fig. 3, the exploitation mode is a schematic view of intermittent exploitation, two exploitation strips close to two sides of the main vertical shaft 3 are exploited by the exploitation vertical shaft 6, the fluid pressure in the exploitation vertical shaft 6 far away from the main vertical shaft 3 side of the exploitation strips is reduced by the lower energy supply horizontal shaft 7, and the natural gas generated by decomposition is conveyed to the offshore exploitation platform 1 through the upper recovery horizontal shaft 5 and the main vertical shaft 3.
Further, when the capacity of two mining strips adjacent to two sides of the main vertical shaft 3 is obviously reduced and commercial mining cannot be met, the main vertical shaft 3 is used for mining the next operation mining strip at intervals along the edge direction of the mining area of the mining strip, so that the interval mining can realize gas production as soon as possible and effectively reduce the sedimentation of the mining on the submarine stratum, and the mining strip has a good preventive effect on the mining area which is easy to generate submarine geological disasters.
The difference between the first embodiment and the second embodiment is that the sequence of the produced strips is opposite, and the structural arrangement is relatively less complex than that of the first embodiment, so that the gas production time period is shortened; and compared with the first embodiment, the embodiment can realize the economic benefit of gas production faster.
Embodiment III:
the difference between the present embodiment and the first embodiment is that, as shown in fig. 4, the mining is performed backward for both sides simultaneously; when the capacity of the two production zones near the edge of the production zone is significantly reduced and commercial production is not satisfactory, the production zones are successively produced in a direction near the vertical shaft 3 in sequence until the vertical shaft 3.
The difference between the embodiment and the embodiment one is that when the geological condition of the exploitation area is better and the submarine stratum is more stable, the exploitation method adopts the embodiment, compared with the embodiment one, the exploitation system is relatively simple to arrange, the exploitation gas yield is relatively large, and the economic benefit is obvious.
Embodiment four:
the difference between this embodiment and the first embodiment is that, as shown in fig. 5, the two mining strips are sequentially mined in a direction away from the vertical shaft 3, until the boundary of the mining area of the strip, when the productivity of two mining strips adjacent to both sides of the main vertical shaft 3 is significantly reduced and commercial mining cannot be satisfied.
The difference between the embodiment and the embodiment II is that when the geological condition of the exploitation area is good and the submarine stratum is stable, the exploitation method of the embodiment is adopted, compared with the embodiment II, the exploitation system is relatively simple to arrange, gas production is continuous, the exploitation gas production is relatively large, and the economic benefit is obvious.
Examples five and six:
the difference between the present embodiment and the first embodiment is that, as shown in fig. 6 and 7, the mining vertical shaft is built only along one side of the vertical shaft 3, and a plurality of mining vertical shafts are arranged close to each other; the back-off production and the forward production are selected separately.
The difference between single-side sequential mining and double-side simultaneous mining is that when the mining area is unsuitable for double-side simultaneous mining, or the mining conditions are very good, the single-side mining is selected to arrange the mining strips when the single-side mining can meet the commercial mining targets, and compared with the double-side simultaneous mining strips, the production system is greatly simplified.
Examples seven and eight:
the difference between the present embodiment and the first embodiment is that, as shown in fig. 8 and 9, the single-side alternate forward exploitation and the single-side alternate backward exploitation are respectively performed, the exploitation vertical shaft is built only along one side of the vertical shaft 3, and a plurality of exploitation vertical shafts with mutual intervals are formed; the back-off production and the forward production are selected separately.
The effect difference between single-side interval mining and single-side sequential mining is that mining operations are carried out on mining strips at intervals, the effect difference between single-side interval mining and double-side interval mining is that when mining areas are unsuitable for two-side simultaneous arrangement of mining strips or mining conditions are very good, when single-side mining can meet commercial mining targets, single-side arrangement of mining strips is selected, and compared with two-side simultaneous arrangement of mining strips, a production system is greatly simplified.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal well," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present invention.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (7)
1. The deep sea natural gas hydrate strip zonal exploitation method is characterized by comprising the following steps of:
s1: determining a region where the natural gas hydrate is located, and analyzing stratum permeability coefficient, stratum temperature and particle grading geological parameters of the natural gas hydrate in the region;
s2: determining the drilling position in the area, and setting up an offshore production platform; the offshore mining platform penetrates through the covering layer through the main vertical shaft and stretches into the area;
s3: determining a mining pushing mode and the length of a mining block, and symmetrically arranging strip mining areas in the area by taking the main vertical shaft as a center;
s4: completing a drilling construction process of a mining vertical well in the strip mining area and installing a mining device, a sand control device and a pipeline;
s5: determining the recovery mode of the strip mining area, and selecting the mining mode;
s6: when the gas production of the mining area in the strip mining area is reduced, switching the mining area in the strip mining area to perform mining work of the non-mining area; the strip production zone comprises an upper recovery horizontal well, a lower energy supply horizontal well and a production vertical well; the upper recovery horizontal well and the lower energy supply horizontal well are respectively arranged at the upper and lower boundaries of the natural gas hydrate reservoir; in the fifth step, the recovery mode is that the main vertical shaft is used as the center in the strip mining area, the mining areas at two sides simultaneously and sequentially advance for mining, the mining areas at two sides simultaneously and sequentially retreat for mining, the mining areas at two sides simultaneously and alternately advance for mining, the mining areas at two sides simultaneously and alternately retreat for mining, the mining areas at two sides alternately advance for mining in sequence at one side, the mining areas at one side alternately advance for mining in sequence, the mining areas at one side alternately advance for mining at intervals or the mining areas at one side alternately retreat for mining at intervals; the progressive exploitation is orderly exploited from the exploitation vertical shaft to a direction away from the main vertical shaft gradually; the backward exploitation is to exploit from the exploitation vertical shaft gradually to the direction close to the main vertical shaft.
2. The deep sea gas hydrate strip zonal extraction method of claim 1, wherein: in the second step, the covering layer is positioned below the sea water layer; the main vertical shaft penetrates through the covering layer and is arranged at the design horizon.
3. The deep sea gas hydrate strip zonal extraction method of claim 2, wherein: the design horizon is the upper and lower boundary position of the natural gas hydrate reservoir.
4. The deep sea gas hydrate strip zonal extraction method of claim 1, wherein: and step five, the mining mode is depressurization mining or heat injection mining.
5. The deep sea natural gas hydrate strip zonal extraction method of claim 4, wherein: the depressurization exploitation is specifically to depressurize the surrounding of the exploitation vertical shaft through the lower energy supply horizontal shaft, and natural gas generated by decomposition is conveyed to the offshore exploitation platform through the upper recovery horizontal shaft and the main vertical shaft.
6. The deep sea natural gas hydrate strip zonal extraction method of claim 4, wherein: the heat injection exploitation mode specifically comprises the steps of injecting high-temperature fluid into the exploitation vertical shaft through the lower energy supply horizontal shaft, and performing well sealing; and natural gas generated by decomposition is conveyed to the offshore exploitation platform through the upper recovery horizontal well and the main vertical well.
7. The deep sea gas hydrate strip zonal extraction method of claim 1, wherein: the mining length of the strip mining area is not less than 20m.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210185932.2A CN114562237B (en) | 2022-02-28 | 2022-02-28 | Deep sea natural gas hydrate strip zone mining method |
| JP2023024999A JP7429469B2 (en) | 2022-02-28 | 2023-02-21 | Deep sea natural gas hydrate strip zone division mining method |
Applications Claiming Priority (1)
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107701150A (en) * | 2017-10-23 | 2018-02-16 | 大庆东油睿佳石油科技有限公司 | A kind of method of offshore natural gas hydrate parallel water horizontal well exploitation |
| 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 |
| CN111827936A (en) * | 2020-08-13 | 2020-10-27 | 中国石油大学(华东) | Batch drilling rolling type well group natural gas hydrate exploitation system and method |
| US10830019B1 (en) * | 2019-06-10 | 2020-11-10 | China University Of Petroleum (East China) | Method for enhancing gas recovery of natural gas hydrate reservoir |
| CN112610191A (en) * | 2020-12-21 | 2021-04-06 | 吉林大学 | Method for exploiting natural gas hydrate reservoir permeable by cover layer by utilizing branch horizontal well |
| CN113700461A (en) * | 2021-09-10 | 2021-11-26 | 郑素珍 | Natural gas hydrate exploitation method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109577924B (en) | 2019-01-25 | 2021-07-06 | 大连理工大学 | Method for exploiting ocean shallow layer natural gas hydrate based on memory alloy material |
| CN113323631B (en) | 2020-02-28 | 2022-03-15 | 中国科学院地质与地球物理研究所 | Natural gas hydrate reservoir exploitation structure and natural gas hydrate exploitation method for injecting hydraulic calcium oxide through gas fracturing |
-
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107701150A (en) * | 2017-10-23 | 2018-02-16 | 大庆东油睿佳石油科技有限公司 | A kind of method of offshore natural gas hydrate parallel water horizontal well exploitation |
| 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 |
| US10830019B1 (en) * | 2019-06-10 | 2020-11-10 | China University Of Petroleum (East China) | Method for enhancing gas recovery of natural gas hydrate reservoir |
| CN111827936A (en) * | 2020-08-13 | 2020-10-27 | 中国石油大学(华东) | Batch drilling rolling type well group natural gas hydrate exploitation system and method |
| CN112610191A (en) * | 2020-12-21 | 2021-04-06 | 吉林大学 | Method for exploiting natural gas hydrate reservoir permeable by cover layer by utilizing branch horizontal well |
| CN113700461A (en) * | 2021-09-10 | 2021-11-26 | 郑素珍 | Natural gas hydrate exploitation method |
Non-Patent Citations (1)
| Title |
|---|
| 双层分支水平井注热海水开采海底天然气水合物经济性评价;蒋贝贝等;《石油钻采工艺》;第37卷(第1期);全文 * |
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