CN108049845B - Method and device for lifting non-diagenetic natural gas hydrate in shallow seabed layer - Google Patents
Method and device for lifting non-diagenetic natural gas hydrate in shallow seabed layer Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 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 18
- 239000013535 sea water Substances 0.000 claims abstract description 38
- 239000002002 slurry Substances 0.000 claims abstract description 30
- 239000004576 sand Substances 0.000 claims abstract description 29
- 239000007787 solid Substances 0.000 claims abstract description 17
- 238000000926 separation method Methods 0.000 claims abstract description 5
- 238000005086 pumping Methods 0.000 claims abstract description 4
- 239000011268 mixed slurry Substances 0.000 claims description 18
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Natural products C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 17
- 239000003345 natural gas Substances 0.000 claims description 14
- -1 natural gas hydrates Chemical class 0.000 claims description 13
- 210000002445 nipple Anatomy 0.000 claims description 11
- 230000009471 action Effects 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 7
- 230000008569 process Effects 0.000 abstract description 5
- 238000005553 drilling Methods 0.000 abstract description 4
- 238000012805 post-processing Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 40
- 239000010419 fine particle Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000005243 fluidization Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013000 chemical inhibitor Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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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
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
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Abstract
The invention discloses a method and a device for lifting a seabed shallow layer non-diagenetic natural gas hydrate, which are used for lifting the seabed shallow layer non-diagenetic natural gas hydrate, a drill bit is used for drilling a pilot hole, a pressure pump is started after the drill bit reaches a preset position, high-pressure seawater drives a screw motor to rotate, and torque and rotating speed are transmitted to the screw pump through a universal shaft; the nozzle starts jet flow crushing, hydrate is collected, secondarily crushed and separated through the collecting port, the secondary crushing device and the separator, sand grains after separation are backfilled, and hydrate slurry is lifted to a solid control system on an ocean platform through a screw pump for post-processing. The invention has the following advantages: the whole process is simple, and the crushing, separation and lifting of the seabed shallow layer non-diagenetic hydrate can be effectively realized; the screw pump device has compact structure, small volume, strong self-priming capability, stable operation and long service life; the upper bridge type channel and the lower bridge type channel skillfully realize pumping and lifting of seawater and hydrate slurry, and save the underground space.
Description
Technical Field
The invention relates to the technical field of natural gas hydrate exploitation, in particular to a method and a device for lifting non-diagenetic natural gas hydrates in a shallow layer of a seabed.
Background
The natural gas hydrate is also called as 'combustible ice', and is a 'cage-shaped compound' formed by hydrocarbon gas mainly containing methane and water under a certain temperature and pressure condition, and the 'cage-shaped compound' is in a white crystalline structure. The natural gas hydrate, particularly the ocean hydrate, is a new energy with the largest reserve which is not developed at present, the reserve is twice as much as the reserve of energy sources such as coal, oil, natural gas and the like known all over the world, but the realization of the effective and controllable commercial exploitation of the hydrate is a difficult problem facing all over the world at present.
The hydrate exists mainly in the forms of sandstone type, sandstone fracture type, fine grain fracture type and dispersion type, wherein the fine grain fracture type and dispersion type hydrate account for most of the hydrate. So far, natural gas hydrate samples obtained in China sea areas are all non-diagenetic natural gas hydrates, and most of the natural gas hydrates successfully obtained all over the world are also non-diagenetic natural gas hydrates. The deepwater non-diagenetic natural gas hydrate has the characteristics of large reserve, weak cementation and poor stability, and once the temperature and pressure conditions of the area are changed, a large amount of seabed non-diagenetic natural gas hydrate can be decomposed, gasified and freely released, so that potential risks exist. Depressurization, heat injection, chemical inhibitor and CO of traditional hydrate exploitation method 2 The method such as the replacement exploitation method is used for carrying out short-term trial exploitation technical demonstration and verification on the natural gas hydrate of the polar sandstone reservoir and the sea sandstone reservoir, the safety of the method needs to be deeply researched, and the single-well test yield is far away from a commercial exploitation threshold. Therefore, a completely new exploitation mode needs to be considered for the development of the shallow and weakly consolidated natural gas hydrate stored in the deep water within a few meters to 200 meters of the surface layer of the sea bottom. Zhou Shou firstly provides a deep-water shallow layer natural gas hydrate solid fluidization exploitation technology according to the world sea area hydrate sampling and the China sea area hydrate sampling conditions, reduces the environmental risk possibly brought by shallow layer hydrate decomposition, and achieves the purpose of green controllable exploitation. However, there is no perfect method and device for collecting mixed slurry, separating hydrate particles from sand grains and lifting hydrate slurry after the shallow hydrate solid fluidization.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a method and a device for lifting a seabed shallow layer non-diagenesis natural gas hydrate, a pressure pump injects seawater into an annulus of a double-layer pipe, the seawater enters an inner cavity of a screw motor through an upper bridge type channel to further drive a rotor of the screw motor to rotate, the seawater is extruded into a lower bridge type channel, a seawater change flow passage enters the annulus outside the screw pump, the seawater in the annulus breaks a hydrate layer through jet flow of a nozzle, and mixed slurry of hydrate and sand grains is generated; meanwhile, a rotor of the screw motor is connected with a rotor central shaft of the screw pump through a universal shaft, power and torque are transmitted to the screw pump to drive the screw pump to rotate, and a negative pressure area is formed at the lower end of the screw pump; the mixed slurry enters a secondary crushing device through a collecting port, and large particles after jet crushing are further crushed into fine particles; then the slurry enters a separator through a spiral pipe in a tangential direction, the slurry moves in the separator in a spiral vortex mode, the outer vortex carries sand grains to be discharged from a sand setting port and backfills the sand grains to the bottom of a well, the inner vortex carries hydrate slurry to be discharged from an overflow pipe, and the discharged hydrate slurry enters a screw pump through a flaring short section; and then the hydrate slurry is lifted upwards under the action of the screw pump, and the hydrate slurry upwards enters an annulus outside the screw motor through the lower bridge passage, then enters an inner pipe of the double-layer pipe through the upper bridge passage, and finally is pumped to a solid control system on the ocean platform for further treatment.
In order to realize the purpose, the technical scheme of the invention is as follows:
a method for lifting non-diagenetic natural gas hydrates at a shallow seabed layer is mainly used for lifting the non-diagenetic natural gas hydrates at the shallow seabed layer and is characterized by mainly comprising the following steps:
step 1: starting a pressure pump on the ocean platform, pumping seawater to the annulus of the double-layer pipe, and enabling the seawater to enter the screw motor through I-V and III-V flow channels of the upper bridge type channel from the annulus; the seawater drives a rotor of the screw motor to rotate in the stator and extrudes the seawater into the lower bridge type channel, and the seawater enters an annular space outside the screw pump through B-E and C-H flow channels of the lower bridge type channel;
step 2: the seawater in the annular space outside the screw pump is jetted through the nozzle to break up a hydrate layer, and mixed slurry of hydrate particles and sand grains is generated; under the action of seawater in the annulus and the pressure difference at the lower end of the screw pump, the mixed slurry sequentially passes through the collecting port, the secondary crushing device, the spiral pipe and the separator for secondary crushing and separation, separated silt is backfilled to the bottom of the well through a sand discharge hole in the middle of the drill bit, and hydrate slurry is discharged from the overflow pipe and enters the screw pump through the flaring nipple;
and 3, step 3: under the action of the screw pump, the hydrate slurry is lifted upwards; the hydrate slurry reaches the lower bridge type channel and enters an annulus outside the screw motor through the F-A and G-D flow channels of the lower bridge type channel; and the hydrate slurry is continuously lifted upwards in an annular space outside the screw motor, enters an inner pipe of the double-layer pipe through IV-II and VI-II runners of the upper bridge type channel, and is finally pumped to a solid control system on the ocean platform for further treatment.
A device for realizing a seabed shallow layer non-diagenetic natural gas hydrate lifting method comprises a pressure pump, a solid control system, a double-layer pipe, an upper bridge type channel, a screw motor, a lower bridge type channel, a universal shaft, a screw pump, a nozzle, a flaring short section, a collecting port, a secondary crushing device, a spiral pipe, a separator, an overflow pipe, a sand discharge hole and a drill bit.
The high-pressure pump is connected with the annular space of the double-layer pipe, and the solid control system is connected with the inner pipe of the double-layer pipe; the upper end of the upper bridge channel is connected with a double-layer pipe, and the lower end of the upper bridge channel is connected with a screw motor; the lower end of the rotor of the screw motor penetrates through the lower bridge type channel and is connected with a rotor central shaft of the screw pump through a universal shaft; the upper end of the lower bridge type channel is connected with a screw motor, and the lower end of the lower bridge type channel is connected with a screw pump; the outer cylinder of the screw pump is provided with a nozzle, and the lower end of the screw pump is connected with the flaring nipple; the upper end of the secondary crushing device is connected with the flaring nipple, the lower end of the secondary crushing device is connected with the separator, a collecting port is arranged on an outer cylinder of the secondary crushing device, and mixed slurry tangentially flows into the separator through a spiral pipe; the upper end of the separator is connected with a secondary crushing device, the lower end of the separator is connected with a drill bit, and the center of the drill bit is provided with a sand discharge hole which is communicated with a sand setting port of the separator and used as a backfill channel of separated silt; an overflow pipe in the separator passes through the center of the secondary crushing device to be connected with the flared nipple and serves as an overflow channel of hydrate slurry, so that the hydrate slurry enters the screw pump, is lifted by the screw pump and is finally pumped to the solid control system for post-treatment.
The invention has the following advantages: (1) The whole process is simple, and the crushing, separation and lifting of the seabed shallow layer non-diagenetic hydrate can be effectively realized; (2) The screw pump device has compact structure, small volume, strong self-absorption capability, stable operation and long service life; (3) The upper bridge type channel and the lower bridge type channel skillfully realize pumping and lifting of seawater and hydrate slurry, and save the underground space.
Drawings
FIG. 1 is a schematic diagram of a process for lifting non-diagenetic natural gas hydrates at a shallow layer of a sea floor;
in the figure, 1-solid control system, 2-pressure pump, 3-ocean platform, 4-double-layer pipe, 5-water-resisting guide pipe, 6-packer, 7-upper bridge channel, 8-stator, 9-rotor, 10-screw motor, 11-universal shaft, 12-rotor central shaft, 13-stator, 14-rotor, 15-flaring short section, 16-collecting port, 17-spiral pipe, 18-lower bridge channel, 19-screw pump, 20-nozzle, 21-secondary crushing device, 22-overflow pipe, 23-separator, 24-drill bit, 25-sand-discharging hole and 26-sand-settling port.
FIG. 2 is a schematic view of an upper bridge channel;
in the figure, I, II, III, IV, V and VI are the names of the runner ports respectively.
FIG. 3 is a schematic view of a lower bridge channel;
in the figure, A, B, C, D, E, F, G, H are the names of the runner ports, respectively.
Detailed Description
The invention will be further described with reference to the accompanying drawings, without limiting the scope of the invention to the following:
the method for lifting the gas hydrate from the shallow non-diagenetic seabed layer mainly comprises the following steps (as shown in figure 1):
step 1: lowering the riser pipe 5, drilling a pilot hole by using the drill bit 24, and stopping drilling by using the drill bit 24 when the drill bit 24 drills to the working depth;
and 2, step: starting a pressure pump 2 on an ocean platform 3, conveying seawater to an annular space of a double-layer pipe 4, and changing a flow channel of the seawater in the annular space through an upper bridge type channel 7 to enter a screw motor 10;
and 3, step 3: the seawater drives the rotor 9 of the screw motor 10 to rotate in the stator 8, so that the seawater is extruded into the lower bridge type channel 18, and a flow passage is changed to enter an annulus outside the screw pump 19;
and 4, step 4: the rotor 9 of the screw motor 10 is connected with a rotor central shaft 12 of the screw pump 19 through a universal shaft 11, and transmits torque and rotating speed to a rotor 14 of the screw pump 19, so that the rotor 14 of the screw pump 19 rotates in a stator 13, and a negative pressure area is formed at the lower end of the screw pump 19;
and 5: the seawater in the annular space outside the screw pump 19 is jetted through the nozzle 20 to break up a hydrate layer, and mixed slurry of hydrate and sand is generated;
and 6: the mixed slurry of hydrate and sand enters a secondary crushing device 21 through a collecting port 16, and large particles after jet flow crushing are further crushed into fine particles;
and 7: the mixed slurry after the secondary crushing tangentially enters a separator 23 through a spiral pipe 17, moves in the separator 23 in a spiral vortex mode, sand carried by the outer vortex is discharged from a sand setting port 26, and is backfilled to the bottom of the well through a sand discharge hole 25 in the middle of a drill bit 24, hydrate slurry carried by the inner vortex is discharged from an overflow pipe 22 and enters a screw pump 19 through a flaring nipple 15;
and 8: under the action of the screw pump 19, the hydrate slurry is lifted upwards, reaches the lower bridge type channel 18, and changes a flow channel to enter an annulus outside the screw motor 10 upwards;
and step 9: the hydrate slurry is continuously lifted upwards in an annular space outside the screw motor 10, enters an inner pipe of the double-layer pipe 4 through the upper bridge type channel 7, and is finally pumped to the solid control system 1 of the ocean platform 3 for further processing;
a riser pipe 5 is placed downwards to separate the double-layer pipe 4 from the seawater, a packer 6 is placed below the outer part of the riser pipe 5 to separate a seawater layer from a hydrate layer, and the lower mining space is ensured to be in a closed state;
the drill bit 24 drills a pilot hole, when the drill bit 24 drills to the working depth, the drill bit 24 stops drilling, the pressure pump 2 on the ocean platform 3 is started, the pressure pump 2 works to convey high-pressure seawater to the annular space of the double-layer pipe 4, and a pressure head required in the whole lifting process is provided;
when the seawater reaches the upper bridge passage 7, the seawater enters the inner cavity of the screw motor 10 through I-V and III-V flow passages (shown in figure 2) of the upper bridge passage 7 from the annulus, the seawater forces the rotor 9 in the screw motor 10 to rotate in the stator 8, so that the seawater is conveyed downwards to the lower bridge passage 18, and the seawater enters the annulus outside the screw pump 19 through B-E and C-H flow passages (shown in figure 3) of the lower bridge passage 18;
a polish rod extending from the lower end of a rotor 9 of the screw motor 10 penetrates through a lower bridge type channel 18 and is connected with a rotor central shaft 12 of a screw pump 19 through a universal shaft 11, and the torque and the rotating speed generated by the screw motor 10 are transmitted to the screw pump 19 through the universal shaft 11 and serve as a power source for upward lifting of the screw pump;
seawater flows into an annulus outside a screw pump 19 from a lower bridge type channel 18, a nozzle 20 is opened, a hydrate layer is broken through jet flow, mixed slurry of hydrate and sand grains is generated, and the mixed slurry enters a secondary breaking device 21 through the collection effect of a collection port 16;
the large particles in the mixed slurry are further crushed into fine particles in a secondary crushing device 21, are spirally conveyed through a spiral pipe 17 and then enter a separator 23 tangentially;
the mixed slurry moves in a spiral vortex mode in the separator 23, due to centrifugal action, outer rotational flow carries sand grains to be discharged from a sand setting port 26, the sand grains are backfilled to the bottom of the well through a sand discharge hole 25 in the middle of the drill bit 24, inner rotational flow carries hydrate slurry to be discharged from the overflow pipe 22, and the hydrate slurry enters an inner cavity of the screw pump 19 through the flaring nipple 15;
the separated hydrate slurry reaches the lower bridge passage 18 under the lifting action of the screw pump 19, enters an annulus outside the screw motor 10 through F-A and G-D flow passages (shown in figure 3) of the lower bridge passage 18, is lifted upwards to the upper bridge passage 7 by the screw pump 19 along the annulus passage, and enters an inner pipe of the double-layer pipe 4 through IV-II and VI-II flow passages (shown in figure 2) of the upper bridge passage 7;
the hydrate slurry is continuously lifted to the solid control system 1 on the ocean platform 3 along the inner pipe of the double-layer pipe 4 for further processing.
A device for realizing a lifting method of a seabed shallow non-diagenetic natural gas hydrate comprises a pressure pump 2, a solid control system 1, a riser pipe 5, a packer 6, a double-layer pipe 4, an upper bridge channel 7, a screw motor 10, a lower bridge channel 18, a universal shaft 11, a screw pump 19, a nozzle 20, a flaring short section 15, a collecting port 16, a secondary crushing device 21, a spiral pipe 17, a separator 23, an overflow pipe 22, a sand discharge hole 25 and a drill bit 24;
the riser pipe 5 is placed in the covering mud layer, a packer 6 is adopted outside the riser pipe 5 to form a closed space, and the double-layer pipe 4 can be isolated from seawater;
the pressure pump 2 on the ocean platform 3 is connected with the annulus of the double-layer pipe 4, seawater is pumped into the annulus to provide a pressure head required by the lifting process, the solid control system 1 on the ocean platform 3 is connected with the inner pipe of the double-layer pipe 4, and the lifted hydrate slurry is recovered;
the upper end of the upper bridge passage 7 is connected with the double-layer pipe 4, the lower end is connected with the screw motor 10, the flow passage ports I and III of the upper bridge passage 7 are communicated with the annular space of the upper-end double-layer pipe 4, the flow passage port II is communicated with the inner pipe of the upper-end double-layer pipe 4, the flow passage ports IV and VI are communicated with the annular space outside the lower-end screw motor 10, and the flow passage port V is communicated with the inner cavity of the lower-end screw motor 10 (as shown in figure 2);
the upper end of a screw motor 10 is connected with an upper bridge channel 7, the lower end of the screw motor is connected with a lower bridge channel 18, a stator 8 of the screw motor 10 is fixed on an inner cylinder, a part of polished rod extending out of the lower end of a rotor 9 penetrates through the lower bridge channel 18 and is connected with a rotor central shaft 12 of a screw pump 19 by a universal shaft 11, and the torque and the rotating speed are transmitted to the screw pump 19 to serve as a power source of the screw pump 19;
the upper end of the lower bridge passage 18 is connected with the screw motor 10, the lower end is connected with the screw pump 19, a flow passage port A, D of the lower bridge passage 18 is communicated with an annulus outside the upper end screw motor 10, a flow passage port B, C is communicated with an inner cavity of the upper end screw motor 10, a flow passage port E, H is communicated with an annulus outside the lower end screw pump 19, a flow passage port F, G is communicated with an inner cavity of the lower end screw pump 19 (shown in figure 3), an outer cylinder of the screw pump 19 is provided with a nozzle 20, the upper end of the screw pump 19 is connected with the lower bridge passage 18, the lower end of the screw pump 19 is connected with a flared nipple 15, a rotor central shaft 12 of the screw pump 19 is assembled in a hollow rotor 14 of the screw pump 19, and a stator 13 is fixed in the inner cylinder;
the upper end of the secondary crushing device 21 is connected with the flaring nipple 15, the lower end of the secondary crushing device 21 is connected with the separator 23, a collecting port 16 is arranged on the outer cylinder of the secondary crushing device 21, the crushed mixed slurry is collected, the secondary crushing device 21 crushes large particles in the mixed slurry into fine particles, and the mixed slurry flows into the separator 23 tangentially through a spiral pipe 17;
the upper end of the separator 23 is connected with the secondary crushing device 21, the lower end is connected with the drill bit 24, and a sand setting port 26 of the separator 23 is communicated with a sand discharge hole 25 in the center of the drill bit 24 and is used as a backfill channel of separated silt;
an overflow pipe 22 in the separator 23 passes through the center of the secondary crushing device 21 and is connected with the flared nipple 15 to be used as an overflow channel of hydrate slurry, so that the hydrate slurry enters the screw pump 19 and is pumped to the solid control system 1 on the ocean platform 3 through the lifting action of the screw pump 19 for further treatment.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. A method for lifting non-diagenetic natural gas hydrates in a shallow seabed layer is characterized in that a lifting device of the non-diagenetic natural gas hydrates in the shallow seabed layer is adopted, and the device comprises a pressure pump, a solid control system, a water-resisting guide pipe, a packer, a double-layer pipe, an upper bridge type channel, a screw motor, a lower bridge type channel, a universal shaft, a screw pump, a nozzle, a flaring short section, a collecting port, a secondary crushing device, a spiral pipe, a separator, an overflow pipe, a sand discharge hole and a drill bit; the solid control system is connected with the inner pipe of the double-layer pipe, and the pressure pump is connected with the annulus of the double-layer pipe; the lower end of the double-layer pipe is connected with an upper bridge type channel, the lower end of the upper bridge type channel is connected with a screw motor, the lower end of the screw motor is connected with a lower bridge type channel, the lower end of the lower bridge type channel is connected with a screw pump, the lower end of the screw pump is connected with an flaring short section, the lower end of the flaring short section is connected with a secondary crushing device, the lower end of the secondary crushing device is connected with a separator, an overflow pipe in the separator penetrates through the center of the secondary crushing device to be connected with the flaring short section, and a sand setting port of the separator is communicated with a sand discharge hole in the center of a drill bit;
the method for lifting the seabed shallow layer non-diagenetic natural gas hydrate mainly comprises the following steps:
step 1: starting a pressure pump on the ocean platform, pumping seawater to the annulus of the double-layer pipe, and enabling the seawater to enter the screw motor through I-V and III-V flow channels of the upper bridge type channel from the annulus; the seawater drives a rotor of the screw motor to rotate in the stator and extrudes the seawater into the lower bridge type channel, and the seawater enters an annular space outside the screw pump through B-E and C-H flow channels of the lower bridge type channel;
step 2: the seawater in the annular space outside the screw pump is jetted through the nozzle to break up a hydrate layer, and mixed slurry of hydrate particles and sand grains is generated; under the action of the seawater in the annulus and the pressure difference at the lower end of the screw pump, the mixed slurry sequentially passes through the collecting port, the secondary crushing device, the spiral pipe and the separator to be subjected to secondary crushing and separation, separated silt is backfilled to the bottom of the well through a sand discharge hole in the middle of the drill bit, and hydrate slurry is discharged from the overflow pipe and enters the screw pump through the flaring nipple;
and step 3: under the action of the screw pump, the hydrate slurry is lifted upwards; the hydrate slurry reaches the lower bridge type channel and enters an annulus outside the screw motor through the F-A and G-D flow channels of the lower bridge type channel; the hydrate slurry is continuously lifted upwards in an annular space outside the screw motor, enters an inner pipe of the double-layer pipe through IV-II and VI-II runners of the upper bridge passage, and is finally pumped to a solid control system on the ocean platform for further treatment.
2. The method for lifting non-diagenetic natural gas hydrates at the shallow seabed layer as claimed in claim 1, wherein the upper end of the upper bridge channel is connected with a double-layer pipe, the lower end of the upper bridge channel is connected with a screw motor, the flow ports I and III positioned on the upper end surface of the upper bridge channel are communicated with the annular space of the double-layer pipe, the flow port II positioned on the upper end surface of the upper bridge channel is communicated with the inner pipe of the double-layer pipe, the flow ports IV and VI positioned on the lower end surface of the upper bridge channel are communicated with the annular space outside the screw motor, and the flow port V positioned on the lower end surface of the upper bridge channel is communicated with the inner cavity of the screw motor.
3. The method for lifting non-diagenetic natural gas hydrates in a shallow seabed layer as claimed in claim 1, wherein the upper end of the screw motor is connected with the upper bridge passage, the lower end of the screw motor is connected with the lower bridge passage, the stator of the screw motor is fixed on the inner cylinder, the polished rod of the lower end of the rotor extends out to penetrate through the lower bridge passage, and the central shaft of the rotor of the screw pump is connected by a universal shaft to transmit the torque and the rotating speed to the screw pump.
4. The method for lifting non-diagenetic natural gas hydrates in the shallow seabed layer as claimed in claim 1, wherein the upper end of the lower bridge channel is connected with a screw motor, the lower end of the lower bridge channel is connected with a screw pump, a flow port A, D on the upper end surface of the lower bridge channel is communicated with the annular space outside the screw motor, a flow port B, C on the upper end surface of the lower bridge channel is communicated with the inner cavity of the screw motor, a flow port E, H on the lower end surface of the lower bridge channel is communicated with the annular space outside the screw pump, and a flow port F, G on the lower end surface of the lower bridge channel is communicated with the inner cavity of the screw pump.
5. The method for lifting non-diagenetic natural gas hydrates at the shallow seabed layer as claimed in claim 1, wherein the upper end of the screw pump is connected with the lower bridge type channel, the lower end of the screw pump is connected with the flaring nipple, the central shaft of the rotor of the screw pump is assembled in the hollow rotor of the screw pump, and the stator is fixed in the inner cylinder.
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| CN201810106889.XA CN108049845B (en) | 2018-02-02 | 2018-02-02 | Method and device for lifting non-diagenetic natural gas hydrate in shallow seabed layer |
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| CN108756829B (en) * | 2018-05-25 | 2020-09-29 | 西南石油大学 | Natural gas hydrate solid flow mining method and system under underbalance positive circulation condition |
| CN108756828B (en) * | 2018-05-25 | 2020-09-25 | 西南石油大学 | Hydrate solid fluidization exploitation method and system under underbalance reverse circulation condition |
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