CN113027390B - Hydrate mining method and device - Google Patents
Hydrate mining method and device Download PDFInfo
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- CN113027390B CN113027390B CN202110366254.5A CN202110366254A CN113027390B CN 113027390 B CN113027390 B CN 113027390B CN 202110366254 A CN202110366254 A CN 202110366254A CN 113027390 B CN113027390 B CN 113027390B
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- 238000005065 mining Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 101
- 239000007789 gas Substances 0.000 claims description 41
- 238000000926 separation method Methods 0.000 claims description 30
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical group 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 claims description 11
- 238000001914 filtration Methods 0.000 claims description 8
- 239000003673 groundwater Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 30
- 238000004519 manufacturing process Methods 0.000 abstract description 24
- 238000002347 injection Methods 0.000 abstract description 18
- 239000007924 injection Substances 0.000 abstract description 18
- 238000001423 gas--liquid extraction Methods 0.000 abstract description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 31
- 239000003345 natural gas Substances 0.000 description 19
- 239000000203 mixture Substances 0.000 description 10
- 239000008398 formation water Substances 0.000 description 9
- 230000009471 action Effects 0.000 description 8
- 239000004576 sand Substances 0.000 description 8
- -1 natural gas hydrates Chemical class 0.000 description 7
- 150000004677 hydrates Chemical class 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000033001 locomotion Effects 0.000 description 5
- 238000005553 drilling Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Images
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
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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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
-
- 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
- E21B43/34—Arrangements for separating materials produced by the well
- E21B43/36—Underwater separating arrangements
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)
- Extraction Or Liquid Replacement (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
The invention relates to a hydrate mining method and device. The method comprises the following steps: gas-liquid extraction of the hydrate and liquid return of the gas-liquid separated liquid to a deeper stratum are realized through the upper chamber and the lower chamber of the piston pump. The invention can greatly improve the efficiency of gas production and water injection by using the scheme of simultaneous production and injection, saves time cost and equipment fund, and simplifies the operation procedure.
Description
Technical Field
The invention relates to the technical field of hydrate exploitation, in particular to a hydrate exploitation method and a hydrate exploitation device.
Background
The natural gas hydrate is a solid cage-type compound generated by natural gas and water under the conditions of low temperature and high pressure, is used as a high-energy-density resource, and has huge total amount of resources in the earth. Global natural gas hydrate resource containing CH4Gas is mainly present in seabed and land permafrost areas, wherein the marine natural gas hydrates account for more than 95 percent of the total amount of natural gas hydrates. Thus, natural gas hydrates, particularly marine natural gas hydrates, are generally considered to be capableCan replace the traditional clean unconventional energy of fossil energy. The natural gas hydrate can be divided into two types of diagenetic rock and non-diagenetic rock according to whether the stratum keeps a complete skeleton structure after the hydrate is decomposed; except that a few sandstone type and sandstone fracture type hydrates belong to diagenetic type, the fine grain fracture type and dispersed type hydrates which account for most of the total amount of the hydrates belong to non-diagenetic type hydrates. The dispersed natural gas hydrate resources exist in seabed fine particle sediments, account for about 90% of the total amount of the hydrate resources, have the characteristics of low saturation, weak cementation and poor permeability, and have the problems of high technical difficulty, poor economy, large risk and the like in the exploitation of the hydrates. Most of the south China sea natural gas hydrates belong to the type, and breakthrough on exploitation processes, technologies and equipment is urgently needed to support the commercial exploitation process of the south China sea hydrates.
The hydrate mining technical equipment can be divided into general key technical equipment and special technical equipment according to different applicability, wherein the general key technical equipment is not only suitable for the marine natural gas hydrate mining industry, but also can be applied to other industries such as marine oil gas or deep sea mining; the latter refers to technical equipment only suitable for marine natural gas hydrate exploitation.
In the existing stage of natural gas hydrate exploitation, a mixture of the natural gas hydrate is extracted through one set of pump system, gas and liquid are separated, the separated gas is output through the other set of pump system, and the separated water is injected into the bottom layer of the gas field, namely, the extraction and the injection are respectively carried out, and separate sets of pumping equipment, motors and other equipment are respectively needed, so that the whole cost of the equipment is high, the operation links are multiple, and the procedures are complicated.
Therefore, in order to overcome the above drawbacks of the prior art, it is necessary to provide an efficient and low-cost solution.
Disclosure of Invention
In view of the above, the present invention aims to provide a hydrate mining method and apparatus, so as to make the hydrate mining more efficient and reduce the cost.
The invention firstly provides a hydrate mining method, which comprises the following steps:
gas-liquid extraction of the hydrate and liquid return of the gas-liquid separated liquid to a deeper stratum are realized through the upper chamber and the lower chamber of the piston pump.
According to an embodiment of the present invention, the liquid separated from the gas and the liquid is sucked through the upper chamber of the piston pump and discharged to a deeper ground; and sucking the underground hydrate through the lower chamber of the piston pump, and discharging the hydrate to a gas-liquid separation position.
According to one embodiment of the invention, both the suction and the discharge of the piston pump are arranged to flow in one direction.
According to one embodiment of the invention, the upper chamber of the piston pump is connected to a liquid intake line and a liquid discharge line, both of which are provided with one-way valves.
According to one embodiment of the invention, the lower chamber of the piston pump is connected to a hydrate suction line and a hydrate discharge line, and the hydrate suction line and the hydrate discharge line are both provided with one-way valves.
According to one embodiment of the invention, when the piston pump moves upwards in the first stroke, the lower chamber of the piston pump produces the downhole hydrate, and the upper chamber of the piston pump returns the separated liquid to the deeper stratum; when the piston pump moves downwards in the second stroke, the upper chamber sucks liquid separated from gas and liquid, and the lower chamber discharges hydrate into the gas-liquid separation assembly for gas-liquid separation.
According to one embodiment of the present invention, when gas and liquid of hydrate are sucked in by a piston pump, the gas and liquid are filtered in the piston pump and then discharged.
According to one embodiment of the invention, the filtration comprises a coarse filtration and a fine filtration; preferably, the diameter of the single hole of the mesh for rough filtration is 1.5mm-3mm, and the diameter of the single hole of the mesh for fine filtration is 0.5mm-1 mm.
According to one embodiment of the invention, the hydrate is natural gas hydrate and the liquid is groundwater.
The invention also provides a hydrate exploitation device which comprises a piston pump assembly, wherein the piston pump assembly executes the operation steps of the piston pump in the hydrate exploitation method.
According to one embodiment of the present invention, the piston pump assembly comprises a piston pump, the piston pump comprises an upper chamber and a lower chamber, the upper chamber of the piston pump is connected to a liquid suction pipeline and a liquid discharge pipeline, and the liquid suction pipeline and the liquid discharge pipeline are both provided with a one-way valve; the lower cavity of the piston pump is connected with a hydrate suction pipeline and a hydrate discharge pipeline, and the hydrate suction pipeline and the hydrate discharge pipeline are both provided with one-way valves; the hydrate exploitation device further comprises a gas-liquid separation component, a gas-liquid inlet of the gas-liquid separation component is connected with the lower chamber of the piston pump, and a liquid outlet of the gas-liquid separation component is connected with the upper chamber of the piston pump; preferably, the lower chamber is provided with a filtering device; more preferably, the filter device includes a first filter and a second filter, the first filter and the second filter being arranged in this order in the gas-liquid inflow direction, and the mesh of the first filter being larger than the mesh of the second filter; more preferably, the mesh single hole diameter of the first filter screen is 1.5mm-3mm, and the mesh single hole diameter of the second filter screen is 0.5mm-1 mm; preferably, a distance of 1cm-2cm is reserved between the first filter screen and the bottom inlet of the piston pump, and further preferably, a distance of 1cm-2cm is reserved between the first filter screen and the second filter screen; preferably, the filter device is configured as a bottom part of the piston pump, which is detachably connected to an upper part of the piston pump in a sealing manner.
Compared with the prior art, the invention needs a set of independent pumping equipment, a set of independent motor and other equipment to carry out different operation procedures respectively because gas production from the bottom layer of the gas field and water injection into the bottom layer of the gas field are carried out at the present stage, and the simultaneous implementation of bottom layer water injection and natural gas production cannot be realized, thereby consuming time and labor and having high manufacturing cost.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic view of a piston pump in connection with a valve according to one embodiment of the present invention;
FIG. 3 is a top view of a first filter according to one embodiment of the present invention;
FIG. 4 is a top view of a second filter according to one embodiment of the present invention;
reference numerals:
1-power supply room, 2-offshore platform, 3-piston pump cable, 4-gas-liquid separator cable, 5-gas-liquid separator, 6-hydrate discharge pipeline, 7-wellhead, 8-piston pump, 9-crank and connecting rod, 10-piston, 11-second filter screen, 12-first filter screen, 13-one-way valve, 14-liquid suction pipeline, 15-hydrate suction pipeline, 16-packer, 17-bolt, 18-flange and 19-liquid discharge pipeline.
Detailed Description
The objects, features and advantages of the present invention will be more clearly understood from the following detailed description of the preferred embodiments of the present invention taken in conjunction with the accompanying drawings. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the essential spirit of the technical solution of the present invention.
In order to overcome the problems that in the current stage, when gas production is carried out from the bottom layer of the gas field and water is injected into the bottom layer of the gas field, a set of independent pumping equipment, a set of independent motor and other equipment are respectively needed to carry out different operation procedures, and the simultaneous implementation of bottom layer water injection and natural gas production cannot be realized, so that the time and labor are consumed, and the manufacturing cost is high.
As shown in fig. 1, according to one embodiment of the present invention, the hydrate exploitation device mainly comprises a downhole piston pump assembly, a gas-liquid separation assembly, an offshore platform 2 and an intermediate connecting pipeline thereof, and the like.
The piston pump assembly is connected to a gas-liquid separation assembly, which in turn is connected to the offshore platform 2.
The piston pump assembly placed in the shaft below the wellhead 7 mainly achieves the following functions: meanwhile, gas and liquid in the reservoir are lifted to a wellhead, and formation water obtained by gas and liquid separation under water is returned to a deeper formation.
According to one embodiment of the invention, the piston pump assembly mainly comprises a piston pump 8, which may be of the double-acting piston pump type, the piston pump 8 comprising an upper chamber and a lower chamber (chambers of the upper and lower part divided by a piston 10), the upper chamber of the piston pump 8 connecting a liquid intake line 14 and a liquid discharge line 19, both the liquid intake line 14 and the liquid discharge line 19 being provided with a one-way valve; the lower cavity of the piston pump 8 is connected with a hydrate suction pipeline 15 and a hydrate discharge pipeline 6, and the hydrate suction pipeline 15 and the hydrate discharge pipeline 6 are both provided with one-way valves. The non-return valve 13 may be provided in plurality, distributed on the suction and discharge lines, respectively.
The hydrate mining device further comprises a gas-liquid separation assembly, the gas-liquid separation assembly mainly comprises a gas-liquid separator 5, a gas-liquid inlet of the gas-liquid separator 5 is connected with a lower cavity of the piston pump 8, and a liquid outlet of the gas-liquid separator 5 is connected with an upper cavity of the piston pump 8.
In order to avoid that a great deal of fine sand is sucked into the pump during the process of exploiting natural gas hydrates, the service life of the piston pump is reduced due to friction and collision while pipelines are blocked, according to one embodiment of the invention, the lower chamber is provided with a filtering device A.
Preferably, the filter device includes a first filter 12 and a second filter 11, the first filter 12 and the second filter 11 are arranged in this order in the gas-liquid inflow direction, and the mesh of the first filter 12 is larger than the mesh of the second filter 11; more preferably, the mesh diameter of the first filter 12 is 1.5mm to 3mm, preferably 2 mm; the diameter of a single hole of the mesh of the second filter screen 11 is 0.5mm-1 mm.
A top view of the first filter 12 is shown in fig. 3 and a top view of the second filter 11 is shown in fig. 4. The filter screen can be made of stainless steel.
Preferably, a distance of 1cm-2cm is reserved between the first filter screen 12 and the bottom inlet of the piston pump 8, so that the filtered fine sand does not block an inlet pipeline; it is further preferred that a distance of 1cm-2cm is left between the first filter 12 and the second filter 11, so that finer sand particles are blocked and stored in the gap.
According to one embodiment of the invention, the filter device a is designed as a bottom part of the piston pump 8, which is detachably connected in a sealing manner to an upper part of the piston pump. Preferably, the bottom part is connected with the upper part of the piston pump 8 by a flange 18 and a bolt 17.
The invention provides a hydrate mining method, which comprises the following steps: gas-liquid extraction of the hydrate and liquid return of the gas-liquid separated liquid to a deeper stratum are realized through the upper chamber and the lower chamber of the piston pump.
According to an embodiment of the present invention, the liquid separated from the gas and the liquid is sucked through the upper chamber of the piston pump 8 and discharged to a deeper ground; and sucking the underground hydrate through the lower chamber of the piston pump 8, and discharging the hydrate to a gas-liquid separation position.
According to one embodiment of the invention, both the intake and the discharge of the piston pump 8 are arranged to flow in one direction.
As shown in fig. 2, the piston pump assembly 10 functions according to the following principle: the upper cavity of the piston pump 8 is a water injection cavity, and the lower cavity is a gas production cavity. For example, according to one embodiment of the invention, when the piston moves upward on the first stroke, the lower chamber will produce downhole natural gas hydrates while the upper chamber returns separated formation water to the deeper bottom layer. At the moment, the mixture of the natural gas hydrate is gathered in the gas production cavity due to the action of the one-way valve, and the separated formation water is gathered in the water injection cavity. The second stroke of the piston is downward movement, and due to the action of the one-way valve, the water injection cavity sucks the formation water separated from the gas-liquid separation assembly, and the mixture of the natural gas and the formation water in the gas production cavity is discharged into the gas-liquid separation assembly for gas-liquid separation.
The piston pump assembly mainly comprises a piston pump 8, a valve, a connecting pipe, a transmission device and a motor (not shown in the figure), and the piston pump 8 mainly comprises a pump cylinder, a piston 10 and a piston. The piston pump drives a crank and a connecting rod 9 through a transmission device by power provided by a motor so as to drive a piston 10 to reciprocate in a pump cylinder.
In one stroke of the piston, one chamber drains liquid and the other chamber recovers gas. For example, when the piston moves upwards in the first stroke (the volume of the lower cavity, namely the inner part of the gas production cavity, is enlarged for gas production, the volume of the upper cavity, namely the water injection cavity, is filled with water, and the water is discharged into the stratum, the underground natural gas is produced (the mixture of the natural gas and the water enters the pump through the sleeve and the one-way valve and finally enters the gas production cavity through two filter screens), and meanwhile, the separated stratum water is cleaned and discharged back to the deeper stratum (the one-way valve plays a role in ensuring the one-way flow of the liquid, namely, the water in the water injection cavity cannot flow back to the gas-liquid separation assembly due to the pressure under the action of the one-way valve). At this time, the natural gas mixture is gathered in the gas production cavity due to the action of the check valve (similarly, the check valve can prevent the pump from sucking the steam-water mixture in the three-phase separator, but only the natural gas mixture in the stratum). The second stroke of the piston is downward movement, and due to the action of the one-way valve, the water injection cavity sucks formation water separated from the underwater gas-liquid separation assembly through a connected pipeline, and a mixture of natural gas and formation water in the gas production cavity is discharged into the gas-liquid separation assembly through the one-way valve and the pipeline to be cleaned and separated.
According to the implementation mode of the invention, two sand prevention filter screens are added into a gas production cavity (lower cavity) of the double-acting piston pump, and a distance is reserved between the first filter screen and the piston pump so that filtered fine sand does not block an inlet pipeline; the first filter screen and the second filter screen are provided with gaps with the same size, so that finer sand grains are blocked and stored in the gaps. The two filter screens and the piston pump are fixed by flanges so as to be convenient for dismounting and replacing the sand control filter screen. The filter screen reduces the risk that the service life of the double-acting piston pump is reduced due to the fact that the fine sand which cannot be separated enters the gas production cavity of the double-acting piston pump to generate friction and collision. The service life of the double-acting piston pump can be prolonged after the filter screen is added, and the filter screen can be conveniently replaced by a detachable structure.
The gas-liquid separation subassembly realizes the main function does: and carrying out gas-liquid separation on the gas and liquid produced underground.
The gas-liquid separation subassembly mainly includes vapour and liquid separator 5, and vapour and liquid separator mainly includes: inlet diverters, defoamers, coalescing plates, vortex eliminators, demisters, and the like. The gas-liquid separator can be realized by adopting the prior art, and therefore, the details are not repeated.
The connection of the gas-liquid separation assembly to the offshore platform 2 may use a riser connection.
The intermediate connecting pipeline is used for conveying electric power and materials. The method mainly comprises the following steps: cables, slurry pipelines, gas production pipes, water drainage pipes and the like. For example, the piston pump cable 3 is used to power the piston pump 8, which may be output from the power supply room 1 of the offshore platform 2, and the gas-liquid separator cable 4 is used to power the gas-liquid separator 5, which may also be output from the power supply room 1 of the offshore platform 2.
The offshore platform 2 can adopt a semi-submersible drilling platform, and has incomparable advantages compared with other types of platforms in deep sea energy exploitation, particularly under severe sea conditions, due to the characteristics of strong wind and wave resistance, excellent motion performance, large deck area and loading capacity, high efficiency and the like. The drilling vessel may employ a mooring system or a dynamic positioning system to anchor the vessel above the subsea wellhead to facilitate drilling. All drilling and living facilities can be arranged on the ship, and the ship has self-navigation capability and is mainly characterized by flexible movement, large adaptive water depth and strong capability. The offshore platform 30 may be implemented using conventional technologies and will not be described herein.
In practice, a zonal packer 16 is lowered into the gas and water interval of the target well to separate the producing zone from the water injection zone, and to separate the zone to be injected from the zone to be produced. And setting the positioning packer 16 to the designed depth, and dividing the original casing string into an upper part and a lower part which are 2 parts. Gas production is carried out through a gas production cavity of a double-acting piston pump arranged in a shaft, and water injection is carried out through a water injection cavity on the upper part of the positioning packer 16; below the set packer 16, passages are established to communicate with the production and injection intervals, respectively, and a check valve is provided as shown.
A gas-liquid separator is arranged at the wellhead part, the input end of the gas-liquid separator is connected with the gas production cavity output part of the double-acting piston pump, and a check valve is arranged; the exhaust port of the gas-liquid separator is connected with natural gas purification treatment equipment on the shore or the platform; the water discharge end of the gas-liquid separator is connected with the water inlet of the water injection cavity of the double-acting piston pump and is provided with a check valve as shown in the figure. At this time, the connection of the natural gas and the equipment for production and injection is finished.
Gas-water mixture produced by the reservoir is sucked by the one-way valve under the drive of the piston pump, enters the gas-liquid separator through the discharge channel for separation, and the separated gas is input into the offshore platform through a pipeline for subsequent treatment; the separated formation water is sucked into the drainage cavity by the one-way valve through the pipeline and the one-way valve and returns to the deeper formation in the next movement of the piston. The one-way valve is used for enabling liquid and gas to flow in a one-way mode and preventing the produced gas-water mixture from being pressed back to the bottom layer.
In a word, the invention can simultaneously realize that the gas and liquid in the reservoir are lifted to the wellhead to be discharged into the gas-liquid separation component, so that the natural gas is efficiently separated out, and the formation water subjected to gas-liquid separation underwater is quickly discharged to a deeper formation.
It should be noted that, in this document, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the system or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention; relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In addition, in the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
The foregoing embodiments are merely illustrative of the present invention, and various components and devices of the embodiments may be changed or eliminated as desired, not all components shown in the drawings are necessarily required, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments described herein, and all equivalent changes and modifications based on the technical solutions of the present invention should not be excluded from the scope of the present invention.
Claims (7)
1. The hydrate exploitation device is characterized by comprising a piston pump assembly and a gas-liquid separation assembly, wherein the piston pump assembly comprises a piston pump, the piston pump comprises an upper chamber and a lower chamber, the upper chamber of the piston pump is connected with a liquid suction pipeline and a liquid discharge pipeline, and the liquid suction pipeline and the liquid discharge pipeline are both provided with one-way valves; the lower cavity of the piston pump is connected with a hydrate suction pipeline and a hydrate discharge pipeline, and the hydrate suction pipeline and the hydrate discharge pipeline are both provided with one-way valves; a gas-liquid inlet of the gas-liquid separation assembly is connected with a lower chamber of the piston pump, a liquid outlet of the gas-liquid separation assembly is connected with an upper chamber of the piston pump, and the lower chamber is provided with a filtering device;
when the piston pump moves upwards in the first stroke, the lower chamber of the piston pump produces the hydrate in the well, and meanwhile, the upper chamber of the piston pump returns the separated liquid to a deeper stratum; when the piston pump moves downwards in the second stroke, the upper chamber sucks liquid separated from gas and liquid, and the lower chamber discharges hydrate into the gas-liquid separation assembly for gas-liquid separation;
when gas and liquid of hydrate are sucked in through the piston pump, the gas and liquid are filtered in the piston pump and then discharged.
2. A hydrate mining apparatus as claimed in claim 1, wherein the hydrate is natural gas hydrate and the liquid is ground water.
3. The hydrate mining device according to claim 1, wherein the filter device includes a first filter and a second filter, the first filter and the second filter being arranged in this order in a gas-liquid inflow direction, and a mesh of the first filter being larger than a mesh of the second filter.
4. A hydrate mining device as claimed in claim 3, wherein the first filter has a mesh diameter of 1.5mm to 3mm and the second filter has a mesh diameter of 0.5mm to 1 mm.
5. A hydrate mining device as claimed in claim 4, wherein the first filter screen is spaced from the bottom inlet of the piston pump by a distance of 1cm to 2 cm.
6. A hydrate mining device as claimed in claim 5, wherein the first filter is spaced from the second filter by a distance of 1cm to 2 cm.
7. A hydrate mining device as claimed in claim 5, wherein the filter means is configured as a bottom portion of the piston pump with a removable sealed connection to an upper portion of the piston pump.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110366254.5A CN113027390B (en) | 2021-04-06 | 2021-04-06 | Hydrate mining method and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110366254.5A CN113027390B (en) | 2021-04-06 | 2021-04-06 | Hydrate mining method and device |
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| CN113027390A CN113027390A (en) | 2021-06-25 |
| CN113027390B true CN113027390B (en) | 2022-06-07 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3875998A (en) * | 1971-10-29 | 1975-04-08 | Rech Activities Petrolieres El | Installation for separation on the seabed of the effluents from underwater oil wells |
| 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 |
| CN101818635A (en) * | 2010-04-02 | 2010-09-01 | 吉林大学 | Method for exploiting natural gas hydrates by using high-pressure thermal jetting |
| CN106428504A (en) * | 2016-10-31 | 2017-02-22 | 河北科技大学 | Small reverse osmosis seawater desalting device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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