CN114991741A - Natural gas hydrate separation device and method - Google Patents
Natural gas hydrate separation device and method Download PDFInfo
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- CN114991741A CN114991741A CN202210529427.5A CN202210529427A CN114991741A CN 114991741 A CN114991741 A CN 114991741A CN 202210529427 A CN202210529427 A CN 202210529427A CN 114991741 A CN114991741 A CN 114991741A
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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
- 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
- E21B43/38—Arrangements for separating materials produced by the well in the well
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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
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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
- 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
Abstract
A natural gas hydrate separation device and a method. The problems of low separation precision, high exploitation cost and short exploitation period of the existing natural gas hydrate separation device are mainly solved. The method is characterized in that: the natural gas hydrate separation device comprises a primary separation module, a secondary separation module, a lifting module, a reinjection module, a hydrate decomposition module and a dehydration module; the first-stage separation module, the second-stage separation module, the lifting module and the reinjection module are arranged on a seabed sediment layer, and the hydrate decomposition module and the dehydration module are arranged on a seabed platform; the mixed liquid flows into a first-stage overflow pipe after first-stage separation, first-stage underflow flows into a second-stage separation part for fine separation, second-stage overflow flows into a second-stage overflow pipe, second-stage underflow is injected back to a hydrate mining layer, lifting liquid is lifted to an offshore platform, the lifting liquid is decomposed into natural gas and water in a decomposition tank, and the natural gas is pressurized and then enters a dehydration part for treatment.
Description
Technical Field
The invention is applied to natural gas hydrate exploitation, and particularly relates to a device and a method capable of realizing high-precision separation of polymorphic natural gas hydrates.
Background
Natural gas hydrates, i.e. combustible ice, are ice-like crystalline substances distributed in deep sea sediments or permafrost in land areas, formed by natural gas and water under high pressure and low temperature conditions, mainly located in sediments with a thickness of about 300-500 m. It is known as "future energy" because of its high energy density, less combustion pollution, wide distribution and large storage capacity. Because of the special and complex environment of the sea bottom, and the methane gas decomposed by natural gas hydrates is a strong greenhouse gas, the exploitation path and method of natural gas hydrates are still in the exploration and testing stage. At present, some natural gas hydrate solid fluidization exploitation schemes exist, but problems which are not solved yet exist in the schemes generally, such as high exploitation cost, short exploitation period, difficulty in separating natural gas hydrate particles with high precision, high exploitation layer pressure and difficulty in reinjection.
Disclosure of Invention
In order to solve the technical problems mentioned in the background technology, the invention provides a natural gas hydrate separation device and a method. Meanwhile, the natural gas hydrate is separated under the scheme, and the method has the characteristics of simple treatment process, continuous operation, high separation precision and low operation cost.
The technical scheme of the invention is as follows: the natural gas hydrate separation device comprises a primary separation module, a secondary separation module, a lifting module, a reinjection module, a hydrate decomposition module and a dehydration module.
The first-stage separation module comprises a first-stage separation inlet pipe, an inlet current stabilizer, a spiral flow channel, a first-stage conical section, a first-stage tail pipe, a first-stage underflow pipe, a first-stage overflow port, a first-stage overflow channel, a first-stage overflow pipe, a first-stage separation outer sleeve, a first-stage separation inner sleeve and a first-stage separation inner fixing support. The sleeve pipe entry threaded connection in the one-level separation is drawn together to the one-level separation inlet pipe, and entry current stabilizer cover is on one-level overflow channel, fixes on the sleeve pipe upper end inner wall in the one-level separation all around, and its main function is the stable liquid that comes, guarantees the efficiency of swirler separation. The spiral flow channel is fixed on the inner wall of the middle end of the first-stage separation inner sleeve, and the first-stage conical section is connected with the first-stage tail pipe and fixed on the inner wall of the lower end of the first-stage separation inner sleeve. The upper end, the middle end and the lower end of the first-stage separation inner sleeve are respectively provided with a taper thread for connecting with each other. The first-stage overflow port is arranged in the first-stage overflow channel, and the first-stage overflow channel is connected with the first-stage overflow pipe through a flange. The outlet of the first-stage separation inner sleeve is in threaded connection with the first-stage underflow pipe. The first-stage separation inner fixed support fixes the first-stage separation inner sleeve on the inner wall of the first-stage separation outer sleeve. The upper and lower sections of the first-stage separation outer sleeve are provided with taper threads for connecting with the second-stage separation module and the lifting module.
The second-stage separation module comprises a second-stage vortex cavity, a second-stage conical section, a second-stage separation tail pipe, a reinjection flow stabilizer, a second-stage underflow pipe, a second-stage overflow channel, a second-stage overflow pipe, a second-stage separation inner sleeve pipe, a second-stage separation outer sleeve pipe and a second-stage separation inner fixing support. The primary underflow pipe is in threaded connection with the secondary separation inlet, the secondary vortex cavity is the upper end of the sleeve in the secondary separation, the secondary conical section is connected with the secondary separation tail pipe, the secondary conical section is fixed at the middle end of the sleeve in the secondary separation, the reinjection flow stabilizer is fixed at the lower end of the sleeve in the secondary separation, the pressure of reinjection is stabilized, normal work of reinjection is guaranteed, and the sleeve in the secondary separation is fixed in an upper mode, a middle mode and a lower mode through conical threaded connection. The second-stage underflow pipe is in threaded connection with the second-stage separation outlet. The secondary overflow channel penetrates through the upper end wall of the secondary separation inner sleeve and is fixed through threads. The lower end of the second-stage overflow pipe is in threaded connection with the upper end of the second-stage overflow channel. The inner fixing support of the secondary separation fixes the inner sleeve of the secondary separation on the inner wall of the outer sleeve of the secondary separation.
The lifting module comprises a lifting motor, a primary overflow lifting pump, a secondary overflow lifting pump, a primary lifting pipe, a secondary lifting pipe, a main lifting pipe, a three-way pipe, a lifting part outer sleeve and a lifting part internal fixed support. The upper end of the first-stage overflow pipe is in threaded connection with the inlet of the first-stage overflow lifting pump, and the first-stage lifting pipe is in threaded connection with the outlet of the first-stage overflow lifting pump. The second-stage overflow pipe is in threaded connection with the inlet of the second-stage overflow lifting pump, and the second-stage lifting pipe is in threaded connection with the outlet of the second-stage overflow lifting pump. The first-stage lifting pipe, the second-stage lifting pipe and the total lifting pipe are in threaded connection with the tee pipe fitting. The lifting motor, the primary overflow lifting pump and the secondary overflow lifting pump are fixed on the inner wall of the outer sleeve of the lifting part by fixed supports in the lifting part.
The reinjection module comprises a reinjection motor, a reinjection pump, a reinjection pipe, a reinjection part internal fixed support and a reinjection part sleeve. The secondary underflow pipe is in threaded connection with an inlet of the reinjection pump, an outlet of the reinjection pump is in threaded connection with the reinjection pipe, and the reinjection motor and the reinjection pump are fixed on the inner wall of a sleeve of the reinjection part by a fixed support inside the reinjection part.
The hydrate decomposition module comprises an inlet one-way valve, a decomposition tank inlet pipe, a decomposition tank outlet pipe, an outlet one-way valve, a multi-stage pump inlet pipe and an offshore platform. The total lifting pipe right end is in threaded connection with the inlet one-way valve left end, the inlet one-way valve right end is in threaded connection with the decomposing tank inlet, the decomposing tank outlet is in threaded connection with the decomposing tank outlet pipe left end, the decomposing tank outlet pipe right end is in threaded connection with the outlet one-way valve left end, and the outlet one-way valve right end is in threaded connection with the multi-stage pump inlet pipe left end.
The dehydration module comprises a dehydration motor, a multistage pump, a dehydration inlet pipe, an inlet cyclone section, a Laval spray pipe section, a cyclone separation section, a diffuser, a natural gas outlet, a condensed water outlet and a dehydration part fixed support. Multistage pump inlet tube right-hand member and multistage pump inlet flange joint, multistage pump export and dehydration inlet tube left end flange joint, dehydration inlet tube right-hand member and import whirl section left end threaded connection, import whirl section right-hand member threaded connection spouts pipeline section left end flange joint with Laval, Laval spouts pipeline section right-hand member and cyclone separation section left end flange joint, cyclone separation section right-hand member and diffuser left end flange joint. The right end of the diffuser is connected with a natural gas outlet flange. The dehydration part fixing support fixes a dehydration motor, a multistage pump, an inlet rotational flow section and a natural gas outlet on the offshore platform.
Each module only has 1 group, and each group is 1, and each module is connected by awl threaded connection.
The upper section and the lower section of the first-stage separation outer sleeve are provided with conical threads which are used for being connected with the second-stage separation module and the lifting module; the secondary underflow pipe is designed with a conical thread and is connected with the reinjection module; the right end of the main lifting pipe is in threaded connection with the left end of the inlet one-way valve, and the right end of the inlet one-way valve is provided with a conical thread and is connected with the hydrate decomposition module; the right end of the inlet pipe of the multistage pump is provided with a taper thread for being connected with the dehydration module.
The device is used for separating the natural gas hydrate, so that a novel natural gas hydrate separation method can be obtained, and the device is characterized in that the primary separation module, the secondary separation module, the lifting module and the reinjection module are positioned in a seabed sediment layer 8, and the hydrate decomposition module and the dehydration module are positioned on a seabed platform
The invention has the following beneficial effects: the treatment process is simple, and the whole set of equipment can be continuously operated; because the two-stage series cyclone separator is adopted, the separation efficiency and the separation precision are improved; the modules are independent from each other due to the modular design, and the processing and the manufacturing are convenient; all modules are connected by threads, so that the installation is convenient and the interchangeability is strong; and the method of reinjecting the separated silt and part of water to the mining layer is adopted, so that the hazards of collapse and the like caused by mining of the mining layer are avoided.
The following is a detailed description:
firstly, make new breakthrough on the basis of the traditional natural gas hydrate solid-state fluidization exploitation equipment, compared with the traditional natural gas hydrate solid-state fluidization exploitation equipment, the design can realize the separation of high-precision solid-state fluidization natural gas hydrate, the dehydration of natural gas and the reinjection of partial sand, thereby saving the exploitation cost and prolonging the exploitation period.
And secondly, due to the adoption of a modularized design, each module has a small volume, and is simpler to produce and process and more convenient to install.
And finally, the dehydration module adopts a Laval nozzle to dehydrate the natural gas, so that the purity of the natural gas is improved.
To sum up, the device makes a new breakthrough on the basis of the traditional natural gas hydrate solid fluidization exploitation device, and compared with the traditional natural gas hydrate solid fluidization exploitation device, the device can realize the separation of high-precision solid fluidization natural gas hydrate, the dehydration of natural gas and the reinjection of partial sand, thereby saving the exploitation cost and prolonging the exploitation period. Taking actual exploitation as an example, a mixed solution (hydrate particles, sand and water) enters a primary separation part through a primary separation inlet pipe to be primarily separated, a primary overflow (a large amount of hydrate particles, a small amount of sand and a small amount of water) flows into a primary overflow pipe, a primary underflow (a small amount of hydrate particles, a large amount of sand and a large amount of water) flows into a secondary separation part to be finely separated, a secondary overflow (a small amount of hydrate and a small amount of water) flows into a secondary overflow pipe, a secondary underflow (a large amount of sand and a large amount of water) is injected into a hydrate exploitation layer, a lifting liquid (a primary overflow and a secondary overflow) is lifted to an offshore platform, the lifting liquid is decomposed into natural gas (containing water vapor) and water in a decomposition tank, and the natural gas is pressurized and then enters a dehydration part to be treated to obtain clean natural gas. Thus, the separation of the solid fluidized natural gas hydrate and the dehydration treatment of the natural gas are completed. The polymorphic high-precision separation scheme for the natural gas hydrate has the advantages of reasonable structural design, higher separation precision, high efficiency of dehydration treatment and the like.
Description of the drawings:
FIG. 1 is a schematic structural diagram of a polymorphic high-precision separation scheme of a natural gas hydrate.
FIG. 2 is a schematic view of a portion of a first stage separation.
FIG. 3 is a schematic diagram of a two-stage separation section.
FIG. 4 is a schematic view of the lift portion.
Fig. 5 is a schematic view of the reinjection section.
FIG. 6 is a schematic view of a hydrate decomposition portion.
FIG. 7 is a schematic view of a dehydration section.
In the figure, 101-a first-stage separation inlet pipe, 102-an inlet current stabilizer, 103-a spiral flow channel, 104-a first-stage conical section, 105-a first-stage tail pipe, 106-a first-stage underflow pipe, 107-a first-stage overflow port, 108-a first-stage overflow channel, 109-a first-stage overflow pipe, 110-a first-stage separation outer sleeve, 111-a first-stage separation inner sleeve, 112-a first-stage separation internal fixed support, 113-a first-stage separation inner sleeve inlet and 114-a first-stage separation inner sleeve outlet. 201-a secondary vortex cavity, 202-a secondary conical section, 203-a secondary separation tail pipe, 204-a reinjection flow stabilizer, 205-a secondary underflow pipe, 206-a secondary overflow channel, 207-a secondary overflow pipe, 208-a secondary separation inner sleeve pipe, 209-a secondary separation outer sleeve pipe, 210-a secondary separation inner fixed support and 211-a secondary separation inlet. 301-lifting motor, 302-first stage overflow lifting pump, 303-second stage overflow lifting pump, 304-first stage lifting pipe, 305-second stage lifting pipe, 306-total lifting pipe, 307-tee pipe fitting, 308-lifting part outer casing pipe, 309-lifting part inner fixed support, 310-first stage overflow lifting pump inlet, 311-first stage overflow lifting pump outlet, 312-second stage overflow lifting pump inlet, 313-second stage overflow lifting pump outlet. 401-reinjection motor, 402-reinjection pump, 403-reinjection pipe, 404-internal fixed support of reinjection part, and 405-sleeve of reinjection part. 406-return pump outlet, 407-return pump inlet. 501-inlet check valve, 502-decomposition tank inlet pipe, 503-decomposition tank, 504-decomposition tank outlet pipe, 505-outlet check valve, 506-multi-stage pump inlet pipe, 507-decomposition tank inlet, 508-decomposition tank outlet. 601-a dehydration motor, 602-a multistage pump, 603-a dehydration inlet pipe, 604-an inlet cyclone section, 605-a Laval spray pipe section, 606-a cyclone separation section, 607-a diffuser, 608-a natural gas outlet, 609-a condensed water outlet, 610-a multistage pump inlet, 611-a multistage pump outlet and 612-a dehydration part fixed support.
The specific implementation mode is as follows:
the invention will be further described with reference to the accompanying drawings in which:
firstly, the multimode high-precision separation scheme of the gas hydrate with the modular design is integrally described with the attached drawings:
as shown in fig. 1, the mixed liquid (hydrate particles, sand, water) of the blocking design natural gas hydrate polymorphic high-precision separation scheme enters a primary separation inner sleeve inlet 113 through a primary separation inlet pipe 101, flows into a spiral flow channel 103 after being stabilized by an inlet stabilizer 102, the mixed liquid is changed into a rotational flow state by the spiral flow channel 103, is separated in a primary cone 104, a primary overflow (a large amount of hydrate particles, a small amount of water, and a small amount of sand) enters a primary overflow pipe 109 through a primary overflow port 107 and a primary overflow channel 108, a primary underflow (a small amount of hydrate particles, a large amount of sand, and a large amount of water) enters a secondary separation rotational flow cavity 201 through a primary separation inner sleeve outlet 114, is separated in a secondary cone 202, and a secondary underflow (a small amount of hydrate particles, a small amount of water) flows into a secondary overflow channel 207 through a secondary overflow channel 206, the secondary underflow (large amount of sand, large amount of water) flows through the reinjection stabilizer 204 into the secondary underflow pipe 205. Secondary underflow is reinjected to the hydrate layer after pressurization by reinjection pump 402. The primary overflow and the secondary overflow pass through a primary overflow lifting pump 302, and the secondary overflow lifting pump 303 is pressurized and then flows into a main lifting pipe 306. The lifting liquid (primary overflow and secondary overflow) enters the decomposition tank 503 through the inlet check valve 501, natural gas hydrate particles are decomposed into natural gas and water, the natural gas (containing water vapor) enters the multistage pump inlet pipe 506 through the outlet check valve 505, the natural gas enters the inlet rotational flow section 604 after being pressurized by the multistage pump 602, the natural gas rapidly expands and obtains supersonic speed in the Laval nozzle section 605, the temperature rapidly drops, the water vapor in the natural gas is rapidly condensed into water drops, the water drops flow out through the condensed water outlet 609, and the dehydrated natural gas flows out through the natural gas outlet 608.
The structure and the operation principle of these units will be described below.
The first-stage separation module comprises a first-stage separation inlet pipe, an inlet current stabilizer, a spiral flow channel, a first-stage conical section, a first-stage tail pipe, a first-stage underflow pipe, a first-stage overflow port, a first-stage overflow channel, a first-stage overflow pipe, a first-stage separation outer sleeve, a first-stage separation inner sleeve and a first-stage separation inner fixing support. The sleeve pipe entry threaded connection in the one-level separation is drawn together to the one-level separation inlet pipe, and entry current stabilizer cover is on one-level overflow channel, fixes on the sleeve pipe upper end inner wall in the one-level separation all around, and its main function is the stable liquid that comes, guarantees the efficiency of swirler separation. The spiral flow channel is fixed on the inner wall of the middle end of the first-stage separation inner sleeve, and the first-stage conical section is connected with the first-stage tail pipe and fixed on the inner wall of the lower end of the first-stage separation inner sleeve. The upper end, the middle end and the lower end of the first-stage separation inner sleeve are respectively provided with a taper thread for connecting with each other. The first-stage overflow port is arranged in the first-stage overflow channel, and the first-stage overflow channel is connected with the first-stage overflow pipe through a flange. The outlet of the first-stage separation inner sleeve is in threaded connection with the first-stage underflow pipe. The first-stage separation inner fixing support fixes the first-stage separation inner sleeve on the inner wall of the first-stage separation outer sleeve. The upper section and the lower section of the first-stage separation outer sleeve are provided with conical threads which are used for being connected with the second-stage separation module and the lifting module;
the second-stage separation module is composed of a second-stage vortex cavity, a second-stage conical section, a second-stage separation tail pipe, a reinjection flow stabilizer, a second-stage underflow pipe, a second-stage overflow channel, a second-stage overflow pipe, a second-stage separation inner sleeve pipe, a second-stage separation outer sleeve pipe and a second-stage separation inner fixing support. The primary underflow pipe is in threaded connection with the secondary separation inlet, the secondary vortex cavity is the upper end of the sleeve in the secondary separation, the secondary conical section is connected with the secondary separation tail pipe, the secondary conical section is fixed at the middle end of the sleeve in the secondary separation, the reinjection flow stabilizer is fixed at the lower end of the sleeve in the secondary separation, the pressure of reinjection is stabilized, normal work of reinjection is guaranteed, and the sleeve in the secondary separation is fixed in an upper mode, a middle mode and a lower mode through conical threaded connection. The second-stage underflow pipe is in threaded connection with the second-stage separation outlet. The secondary overflow channel penetrates through the upper end wall of the secondary separation inner sleeve and is fixed through threads. The lower end of the second-stage overflow pipe is in threaded connection with the upper end of the second-stage overflow channel. The secondary separation inner fixed support fixes the secondary separation inner sleeve on the inner wall of the secondary separation outer sleeve;
the lifting module is composed of a lifting motor, a primary overflow lifting pump, a secondary overflow lifting pump, a primary lifting pipe, a secondary lifting pipe, a main lifting pipe, a three-way pipe, a lifting part outer sleeve and a lifting part internal fixed support. The upper end of the first-stage overflow pipe is in threaded connection with the inlet of the first-stage overflow lifting pump, and the first-stage lifting pipe is in threaded connection with the outlet of the first-stage overflow lifting pump. The second-stage overflow pipe is in threaded connection with the inlet of the second-stage overflow lifting pump, and the second-stage lifting pipe is in threaded connection with the outlet of the second-stage overflow lifting pump. The primary lifting pipe, the secondary lifting pipe and the total lifting pipe are in threaded connection with the three-way pipe fitting. The lifting motor, the primary overflow lifting pump and the secondary overflow lifting pump are fixed on the inner wall of the outer sleeve of the lifting part by a fixed support inside the lifting part;
the reinjection module is composed of a reinjection motor, a reinjection pump, a reinjection pipe, a reinjection part internal fixed support and a reinjection part sleeve. The secondary underflow pipe is in threaded connection with an inlet of a reinjection pump, an outlet of the reinjection pump is in threaded connection with the reinjection pipe, and a reinjection motor and the reinjection pump are fixed on the inner wall of a sleeve of the reinjection part by a fixed support inside the reinjection part;
the hydrate decomposition module is composed of an inlet one-way valve, a decomposition tank inlet pipe, a decomposition tank outlet pipe, an outlet one-way valve, a multi-stage pump inlet pipe and an offshore platform. The right end of the main lifting pipe is in threaded connection with the left end of the inlet one-way valve, the right end of the inlet one-way valve is in threaded connection with the inlet of the decomposition tank, the outlet of the decomposition tank is in threaded connection with the left end of the outlet pipe of the decomposition tank, the right end of the outlet pipe of the decomposition tank is in threaded connection with the left end of the outlet one-way valve, and the right end of the outlet one-way valve is in threaded connection with the left end of the inlet pipe of the multi-stage pump;
the dehydration module consists of a dehydration motor, a multistage pump, a dehydration inlet pipe, an inlet cyclone section, a Laval spraying pipe section, a cyclone separation section, a diffuser, a natural gas outlet, a condensed water outlet, a dehydration part fixed support and an offshore platform. Multistage pump inlet tube right-hand member and multistage pump inlet flange joint, multistage pump export and dehydration inlet tube left end flange joint, dehydration inlet tube right-hand member and import whirl section left end threaded connection, import whirl section right-hand member threaded connection spouts pipeline section left end flange joint with Laval, Laval spouts pipeline section right-hand member and cyclone separation section left end flange joint, cyclone separation section right-hand member and diffuser left end flange joint. The right end of the diffuser is connected with a natural gas outlet flange. The dehydration part fixing support fixes a dehydration motor, a multistage pump, an inlet rotational flow section and a natural gas outlet on the offshore platform;
each module only has 1 group, and each group is 1, and each module is connected by awl threaded connection.
The upper section and the lower section of the first-stage separation outer sleeve are provided with conical threads which are used for being connected with the second-stage separation module and the lifting module; the secondary underflow pipe is designed with a conical thread and is connected with the reinjection module; the right end of the main lifting pipe is in threaded connection with the left end of the inlet one-way valve, and the right end of the inlet one-way valve is provided with a conical thread and is connected with the hydrate decomposition module; the right end of the inlet pipe of the multistage pump is provided with a taper thread for being connected with the dehydration module.
Next, the motion process of the multimode high-precision separation scheme of the gas hydrate with the modular design is described first.
According to the working principle of the polymorphic high-precision separation scheme of the natural gas hydrate, one movement cycle can be divided into two stages.
The first stage is as follows: the mixed liquid (hydrate particles, sand and water) enters a primary separation inner sleeve inlet 113 through a primary separation inlet pipe 101, flows into a spiral flow channel 103 after being stabilized by an inlet flow stabilizer 102, the mixed liquid is changed into a rotational flow state by the spiral flow channel 103, separated in the primary cone section 104, the primary overflow (a large amount of hydrate particles, a small amount of water and a small amount of sand) enters a primary overflow pipe 109 through a primary overflow port 107 and a primary overflow channel 108, the first-stage underflow (a small amount of hydrate particles, a large amount of sand and a large amount of water) enters the second-stage separation cyclone cavity 201 through the first-stage separation inner sleeve outlet 114, separated in the secondary cone section 202, the secondary underflow (small amount of hydrate particles, small amount of water) flows through the secondary overflow channel 206 into the secondary overflow pipe 207, the secondary underflow (large amount of sand, large amount of water) flows through the reinjection flow stabilizer 204 into the secondary underflow pipe 205. Secondary underflow is reinjected to the hydrate layer after pressurization by reinjection pump 402. The primary overflow and the secondary overflow pass through a primary overflow lifting pump 302, and the secondary overflow lifting pump 303 is pressurized and then flows into a main lifting pipe 306.
And a second stage: the lifting liquid (primary overflow and secondary overflow) enters the decomposition tank 503 through the inlet check valve 501, natural gas hydrate particles are decomposed into natural gas and water, the natural gas (containing water vapor) enters the multistage pump inlet pipe 506 through the outlet check valve 505, the natural gas enters the inlet rotational flow section 604 after being pressurized by the multistage pump 602, the natural gas rapidly expands and obtains supersonic speed in the Laval nozzle section 605, the temperature rapidly drops, the water vapor in the natural gas is rapidly condensed into water drops, the water drops flow out through the condensed water outlet 609, and the dehydrated natural gas flows out through the natural gas outlet 608.
The polymorphic high-precision separation scheme of the natural gas hydrate provided by the invention can be applied to deep sea sediments with the thickness of about 300-500 m. Compared with the prior art, the device is more convenient to process and install, and the exploitation period is prolonged. Taking actual exploitation as an example, mixed liquid (hydrate particles, sand and water) enters a primary separation part through a primary separation inlet pipe to be primarily separated, primary overflow (a large amount of hydrate particles, a small amount of sand and a small amount of water) flows into a primary overflow pipe, primary underflow (a small amount of hydrate particles, a large amount of sand and a large amount of water) flows into a secondary separation part to be finely separated, secondary overflow (a small amount of hydrate and a small amount of water) flows into a secondary overflow pipe, secondary underflow (a large amount of sand and a large amount of water) is injected into a hydrate exploitation layer, lifting liquid (primary overflow and secondary overflow) is lifted to an offshore platform, the lifting liquid is decomposed into natural gas (containing water vapor) and water in a decomposition tank, and the natural gas is pressurized and then enters a dehydration part to be treated to obtain clean natural gas. Thus, the separation of the solid fluidized natural gas hydrate and the dehydration treatment of the natural gas are completed. The natural gas hydrate polymorphic high-precision separation scheme has the advantages of reasonable structural design, higher separation precision, high-efficiency dehydration treatment and the like.
Claims (6)
1. A primary separation module for use in a natural gas hydrate separation plant comprising a primary separation inlet pipe (101) and an inlet flow stabilizer (102), characterized by:
the primary separation module also comprises a spiral flow channel (103), a primary conical section (104), a primary tail pipe (105), a primary underflow pipe (106), a primary overflow port (107), a primary overflow channel (108), a primary overflow pipe (109), a primary separation outer sleeve (110), a primary separation inner sleeve (111) and a primary separation inner fixed support (112); the cyclone separation device comprises a primary separation inlet pipe (101), a primary separation inner sleeve pipe inlet (113), an inlet flow stabilizer (102), a primary overflow channel (108), a primary separation inner sleeve pipe (111), a primary overflow channel and a primary overflow channel, wherein the primary separation inlet pipe (101) is in threaded connection with the primary separation inner sleeve pipe inlet (113); the spiral flow channel (103) is fixed on the inner wall of the middle end of the first-stage separation inner sleeve (111), and the first-stage conical section (104) is connected with the first-stage tail pipe (105) and fixed on the inner wall of the lower end of the first-stage separation inner sleeve (111); the upper end, the middle end and the lower end of the primary separation inner sleeve (111) are respectively provided with a conical thread for connecting with each other; the primary overflow port (107) is arranged in the primary overflow channel (108), and the primary overflow channel (108) is connected with the primary overflow pipe (109) through a flange; the first-stage separation inner sleeve outlet (114) is in threaded connection with the first-stage underflow pipe (106); the primary separation inner fixed support (112) fixes the primary separation inner sleeve (111) on the inner wall of the primary separation outer sleeve (110); the upper section and the lower section of the first-stage separation outer sleeve (110) are provided with taper threads for connecting with the second-stage separation module (2) and the lifting module (3).
2. A two-stage separation module for natural gas hydrate separation device, includes two-stage whirl chamber (201) and two-stage conic section (202), its characterized in that:
the secondary separation module also comprises a secondary separation tail pipe (203), a reinjection flow stabilizer (204), a secondary underflow pipe (205), a secondary overflow channel (206), a secondary overflow pipe (207), a secondary separation inner sleeve pipe (208), a secondary separation outer sleeve pipe (209) and a secondary separation inner fixing support (210); the primary underflow pipe (106) is in threaded connection with the secondary separation inlet (211), the secondary vortex cavity (201) is the upper end of the secondary separation inner sleeve (208), the secondary conical section (202) is connected with the secondary separation tail pipe (203), the secondary conical section (202) is fixed at the middle end of the secondary separation inner sleeve (208), the reinjection flow stabilizer (204) is fixed at the lower end of the secondary separation inner sleeve (208) and has the function of stabilizing the pressure of reinjection to ensure the normal work of reinjection, and the upper part, the middle part and the lower part of the secondary separation inner sleeve (208) are connected and fixed through conical threads; the secondary underflow pipe (205) is in threaded connection with the secondary separation outlet; the secondary overflow channel (206) passes through the upper end wall of the secondary separation inner sleeve (208) and is fixed through threads; the lower end of the secondary overflow pipe (207) is in threaded connection with the upper end of the secondary overflow channel (206); the secondary separation inner fixed support (210) fixes the secondary separation inner sleeve (208) on the inner wall of the secondary separation outer sleeve (209).
3. A lifting module for use in a natural gas hydrate separation device, comprising a lifting motor (301), characterized in that: the lifting module further comprises a primary overflow lifting pump (302), a secondary overflow lifting pump (303), a primary lifting pipe (304), a secondary lifting pipe (305), a total lifting pipe (306), a tee pipe fitting (307), a lifting part outer sleeve (308) and a lifting part inner fixing support (309); wherein, the upper end of the first-stage overflow pipe (109) is in threaded connection with the inlet (310) of the first-stage overflow lifting pump, and the first-stage lifting pipe (304) is in threaded connection with the outlet (311) of the first-stage overflow lifting pump; the secondary overflow pipe (207) is in threaded connection with an inlet (312) of a secondary overflow lifting pump, and the secondary lifting pipe (305) is in threaded connection with an outlet (313) of the secondary overflow lifting pump; the primary lifting pipe (304), the secondary lifting pipe (305) and the total lifting pipe (306) are in threaded connection with the tee pipe fitting (307); the lifting motor (301), the primary overflow lifting pump (302) and the secondary overflow lifting pump (303) are fixed on the inner wall of the outer sleeve (308) of the lifting part by the lifting part inner fixing support (309).
4. A dehydration module for use in a natural gas hydrate separation device, comprising a dehydration motor (601), characterized in that: the dehydration module further comprises a multi-stage pump (602), a dehydration inlet pipe (603), an inlet cyclone section (604), a Laval spray pipe section (605), a cyclone separation section (606), a diffuser (607), a natural gas outlet (608), a condensed water outlet (609) and a dehydration part fixed support (612); the right end of a multi-stage pump inlet pipe (506) is connected with a flange of a multi-stage pump inlet (610), a multi-stage pump outlet (611) is connected with a flange of the left end of a dehydration inlet pipe (603), the right end of the dehydration inlet pipe (603) is in threaded connection with the left end of an inlet cyclone section (604), the right end of the inlet cyclone section (604) is in threaded connection with a flange of the left end of a Laval nozzle section (605), the right end of the Laval nozzle section (605) is connected with a flange of the left end of a cyclone separation section (606), and the right end of the cyclone separation section (606) is connected with a flange of the left end of a diffuser (607); the right end of the diffuser (607) is connected with a flange of a natural gas outlet (608); the dehydration part fixing support (612) is used for fixing the dehydration motor (601), the multistage pump (602), the inlet cyclone section (604) and the natural gas outlet (608) on the offshore platform (7).
5. A natural gas hydrate separation device, characterized by comprising the primary separation module, the secondary separation module, the lifting module and the dehydration module of claims 1 to 4, and a reinjection module and a hydrate decomposition module;
the reinjection system comprises a reinjection module (4), a reinjection motor (401), a reinjection pump (402), a reinjection pipe (403), a reinjection part internal fixing support (404) and a reinjection part sleeve (405); the secondary underflow pipe (205) is in threaded connection with an inlet (407) of the reinjection pump, an outlet (406) of the reinjection pump is in threaded connection with the reinjection pipe (403), and a reinjection motor (401) and the reinjection pump (402) are fixed on the inner wall of a reinjection part sleeve (405) by an internal fixed support (404) of the reinjection part;
the hydrate decomposition module (5) comprises an inlet one-way valve (501), a decomposition tank inlet pipe (502), a decomposition tank (503), a decomposition tank outlet pipe (504), an outlet one-way valve (505) and a multi-stage pump inlet pipe (506); the right end of the main lifting pipe (306) is in threaded connection with the left end of an inlet one-way valve (501), the right end of the inlet one-way valve (501) is in threaded connection with an inlet (507) of a decomposition tank, an outlet (508) of the decomposition tank is in threaded connection with the left end of an outlet pipe (504) of the decomposition tank, the right end of the outlet pipe (504) of the decomposition tank is in threaded connection with the left end of an outlet one-way valve (505), and the right end of the outlet one-way valve (505) is in threaded connection with the left end of an inlet pipe (506) of a multi-stage pump;
the primary separation module, the secondary separation module, the lifting module, the dehydration module, the reinjection module and the hydrate decomposition module are only provided with 1 group, each group is provided with 1, and all the modules are connected by taper threads;
the upper section and the lower section of the first-stage separation outer sleeve (110) are provided with conical threads which are used for being connected with the second-stage separation module (2) and the lifting module (3); the secondary underflow pipe (205) is designed with a conical thread and is used for being connected with the reinjection module (4); the right end of the main lifting riser (306) is in threaded connection with the left end of the inlet one-way valve (501), and the right end of the inlet one-way valve (501) is provided with conical threads for being connected with the hydrate decomposition module (5); the right end of the multi-stage pump inlet pipe (506) is provided with a taper thread and is used for being connected with the dehydration module (6).
6. A natural gas hydrate separation method is characterized in that the device of claim 5 is applied to perform natural gas hydrate separation, a primary separation module, a secondary separation module, a lifting module and a reinjection module are arranged in a seabed sediment layer (8), and a hydrate decomposition module (5) and a dehydration module (6) are arranged on a seabed platform (7).
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