CN106837259B - Device and method for increasing yield of marine shallow natural gas hydrate microtubules - Google Patents
Device and method for increasing yield of marine shallow natural gas hydrate microtubules Download PDFInfo
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- CN106837259B CN106837259B CN201710211075.8A CN201710211075A CN106837259B CN 106837259 B CN106837259 B CN 106837259B CN 201710211075 A CN201710211075 A CN 201710211075A CN 106837259 B CN106837259 B CN 106837259B
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- 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 43
- 238000000034 method Methods 0.000 title claims abstract description 39
- 102000029749 Microtubule Human genes 0.000 title claims description 8
- 108091022875 Microtubule Proteins 0.000 title claims description 8
- 210000004688 microtubule Anatomy 0.000 title claims description 8
- 238000004519 manufacturing process Methods 0.000 claims abstract description 28
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 5
- 239000010959 steel Substances 0.000 claims abstract description 5
- 230000007246 mechanism Effects 0.000 claims description 23
- 238000005553 drilling Methods 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 claims description 11
- 230000009471 action Effects 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 9
- 239000007864 aqueous solution Substances 0.000 claims description 6
- 230000000638 stimulation Effects 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 230000035699 permeability Effects 0.000 abstract description 5
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 4
- 238000002347 injection Methods 0.000 abstract description 4
- 239000007924 injection Substances 0.000 abstract description 4
- 230000035939 shock Effects 0.000 abstract description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
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- 239000003345 natural gas Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
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- 238000011549 displacement method Methods 0.000 description 1
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- 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
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- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0099—Equipment or details not covered by groups E21B15/00 - E21B40/00 specially adapted for drilling for or production of natural hydrate or clathrate gas reservoirs; Drilling through or monitoring of formations containing gas hydrates or clathrates
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Abstract
The invention discloses a device and a method for increasing the yield of an ocean shallow natural gas hydrate micro-tube. A certain number of micro-pipes are arranged in a hydrate reservoir underground surrounding a shallow ocean natural gas hydrate well, the micro-pipes are high-pressure resistant steel pipes with holes and certain flexibility, and a micro-pipe network which is uniform, has certain intervals and is spatially distributed is formed in the well section of the whole hydrate reservoir, namely, an unblocked fixed production channel is formed. The invention is suitable for various marine natural gas hydrate exploitation methods such as a depressurization method, a heat shock method, a chemical reagent injection method and the like; the method can effectively enlarge the contact area between the production channel and the hydrate reservoir, thereby improving the permeability of the reservoir, improving the heat and mass transfer efficiency and the flow conductivity of the reservoir, and achieving the purposes of improving the exploitation efficiency and realizing the economic and efficient exploitation of the marine shallow natural gas hydrate.
Description
Technical Field
The invention relates to the field of commercial exploitation of marine hydrates, in particular to a device and a method for increasing yield of marine shallow natural gas hydrate micro-tubes.
Background
The natural gas hydrate is a cage-shaped crystal substance generated by natural gas and water under specific temperature and pressure (low temperature and high pressure), is like ice and snow, and is commonly called as 'combustible ice' because the cage-shaped crystal substance can be ignited. Natural Gas Hydrate (Natural Gas Hydrate) is a clean and efficient emerging energy source, and the reserve of the Natural Gas Hydrate is huge. The reserve of total organic carbon in natural gas hydrate on the earth is about twice of the sum of petroleum, natural gas and coal, wherein the natural gas hydrate resource amount of the ocean area accounts for 99 percent of the total resource amount. With the progressive and intensive research on marine gas hydrate production, commercial production is also becoming more and more likely.
At present, the method for theoretically exploiting the marine natural gas hydrate mainly comprises a depressurization method, a heat shock method, a chemical reagent injection method and CO 2 Substitution method. The heat shock method can lead the hydrate to be decomposed at a high speed, but only can locally heat the hydrate layer due to the limited contact area between the production channel and the hydrate reservoir, and the heat utilization efficiency is low; the depressurization method is relatively economical, but because the sea hydrate reservoir has the characteristics of poor permeability, low heat and mass transfer efficiency and low flow conductivity, the depressurization exploitation can not be efficiently and continuously carried out; in the use of chemical injection method with CO 2 In the process of exploiting hydrate by displacement method, chemical reagent and CO 2 The effect on the natural gas hydrate layer is slow, and a method for increasing the contact area of physical and chemical reactions is needed to improve the exploitation efficiency. The exploitation efficiency is an important factor for restricting the commercial exploitation of the hydrate, and the expansion of the contact area of the production channel and the hydrate reservoir can effectively improve the permeability of the reservoir, improve the heat and mass transfer efficiency and the flow conductivity of the reservoir and achieve the purpose of improving the exploitation efficiency, so that the expansion of the contact area of the production channel and the hydrate reservoir is a necessary way for realizing the economic and efficient exploitation of the seabed natural gas hydrate.
The existing patent retrieval finds that CN201310488336.2 discloses a natural gas hydrate exploitation method and device combining depressurization and hydraulic fracturing technologies, and the natural gas hydrate exploitation method and device is used for carrying out hydraulic fracturing to improve the permeability of a reservoir stratum by injecting fracturing fluid into the hydrate reservoir stratum so as to carry out depressurization exploitation; the invention patent application with the Chinese application number of 201510455687.2 provides a depressurization type ocean natural gas hydrate exploitation method and a seabed exploitation system, and the exploitation contact area is increased and the depressurization exploitation is carried out on the hydrate by a method of constructing a multi-cluster-perforation horizontal well on the seabed.
The method can be seen in two existing methods for enlarging the contact area between a production channel and a hydrate reservoir stratum, wherein one method is hydraulic fracturing of the hydrate reservoir stratum, and the other method is to construct a production horizontal well in the hydrate reservoir stratum. The seabed shallow natural gas hydrate layer is subjected to little tectonic movement, low density and high deposition rate, is mostly in a saturated or semi-saturated non-diagenetic stage, is weak in reservoir cementation degree, loose in sediment particle arrangement and low in strength, is generally a sludge, clay, silt and sand-mud mixed layer, and mainly comprises cohesive soil and sandy soil; therefore, the problems that hydraulic fracturing yield-increasing cracks are easy to close, horizontal well construction is difficult to construct and the like can be caused, and the expansion of the contact area of a production channel and a hydrate reservoir in a mode of performing hydraulic fracturing on a seabed shallow hydrate reservoir and constructing a horizontal well is difficult to realize; therefore, a stimulation device and a stimulation method for enlarging the contact area between the ocean shallow natural gas hydrate production channel and the hydrate reservoir stratum are needed.
Disclosure of Invention
Aiming at the problems, the invention provides a micro-tube yield increasing device and method for marine shallow natural gas hydrate, which are characterized in that a certain number of micro-tubes are arranged in a hydrate reservoir stratum around the underground marine shallow natural gas hydrate, the micro-tubes are high-pressure-resistant steel tubes with holes and certain flexibility, and a micro-tube network with uniform, certain intervals and spatial distribution is formed in the well section of the whole hydrate reservoir stratum, so that the contact area between a production channel and the hydrate reservoir stratum is effectively enlarged, the aims of improving the exploitation efficiency and realizing the economic and efficient exploitation of the marine shallow natural gas hydrate are fulfilled.
The invention relates to a micro-tube yield increasing device for marine shallow natural gas hydrate, which consists of a guide device, a wellhead device, a central tube column, a cable, a thick-wall guide tube, a micro-tube and a guide drill bit.
The guiding device comprises a central channel, a seat sealing mechanism, an inclined hole, an electrochemical cutter, a positioning mechanism, a guiding conical surface and a guiding hole; the guide holes are circular channels with proper curvature, six guide holes are distributed in the guide holes, and the six guide holes are symmetrically distributed on the periphery of the central channel; six electrochemical cutters are arranged and are respectively connected with outlets of the six guide holes and used for cutting the microtubes. The center pipe column is used for connecting the center channel of the guiding device, placing the guiding device to the production well, and is used for setting and unsealing the guiding device. The cable is connected to the electrochemical cutter through the center tubing string, the central passageway, and the angled bore. The positioning mechanism plays a role in guiding and positioning, the thick-wall catheter is accurately located on the guiding conical surface through the positioning mechanism, and the conical surface of the thick-wall catheter is matched with the guiding conical surface. The wellhead device is arranged at a wellhead and provides vertical downward feeding force for the micro-pipe when the micro-pipe is arranged. The annular gap between the micro-tube and the thick-wall conduit is smaller than the outer diameter of the micro-tube, so that the micro-tube is prevented from buckling in the thick-wall conduit channel, and the smooth arrangement operation of the micro-tube is ensured. And the tail end port of the micro pipe is provided with a guide drill bit for extruding and crushing the hydrate reservoir stratum during the micro pipe arrangement operation. The micro-pipe is a high-pressure resistant steel pipe with certain flexibility, the outer wall of the micro-pipe is provided with holes with the same aperture, and the holes are round holes with certain sizes, so that the micro-pipe channel (namely an output channel) is not blocked in the mining process; the outer diameter of the micro tube ranges from 15mm to 35mm.
The invention relates to a yield increasing method for marine shallow natural gas hydrate, which comprises the following steps:
1) Constructing a production well: drilling a vertical borehole in a marine shallow natural gas hydrate reservoir region, penetrating through an upper covering layer, stopping drilling, running a casing for cementing and cementing after drilling to the vicinity of the top boundary of a hydrate reservoir, then drilling through the hydrate reservoir to the top boundary of a natural gas hydrate lower covering layer, directly running a perforation device for perforating without performing cementing operation after running the casing, and forming perforation channels with uniform intervals in the well section of the whole hydrate reservoir; after a period of time, the perforation channels gradually close, forming fracture zones distributed along the perforation channels.
2) And (3) micro-pipe arrangement operation:
(1) lowering a guide device: the central pipe column is connected to the central channel of the guiding device, the guiding device is lowered to the hydrate reservoir well section through the central pipe column, and the outlet of the guiding hole corresponds to the perforation channel.
(2) Setting operation: a seat sealing mechanism in the guiding device adopts a mechanical seat sealing mode, and the guiding device is sealed on the inner wall of the casing by actions of rotating, lowering and lifting the central pipe column and the like.
(3) Arranging a micro tube: firstly, a thick-wall guide pipe is placed from a well mouth of a production well to a guide device, the thick-wall guide pipe is accurately located on a guide conical surface through a positioning mechanism, and the conical surface of the thick-wall guide pipe is matched with the guide conical surface; then, a micro-tube is put into the guide device through the thick-wall guide tube, the micro-tube enters a guide hole in the guide device along an inner channel of the thick-wall guide tube, and the annular gap between the micro-tube and the thick-wall guide tube is smaller than the outer diameter of the micro-tube, so that the micro-tube can be prevented from buckling in the thick-wall guide tube; and finally, under the action of vertical downward feeding force provided by the wellhead device, the micro-pipe horizontally enters the hydrate reservoir stratum along the perforation channel crushing zone after passing through the guide hole with proper curvature, and under the guide action of the perforation channel crushing zone, the guide drill bit extrudes the crushed hydrate reservoir stratum and gradually penetrates into the hydrate reservoir stratum until reaching a preset depth. The depth ranges from 10m to 20m.
(4) Cutting the microtubes: the cable is connected to the electrochemical cutters through the central pipe column, the central channel and the inclined holes, and the six electrochemical cutters are respectively connected with outlets of the six guide holes; pumping a KCL aqueous solution from a wellhead, leading the KCL aqueous solution to reach an electrochemical cutter through a central channel and an inclined hole of a central pipe column and a guide device, then electrifying a cable, and carrying out electrochemical cutting on the microtube by using direct current power supply; after cutting the microtubes, the remaining part is lifted off the thick-walled catheter channel, and the first microtube placement operation is finished. Then, lifting the thick-wall guide pipe for a certain distance, accurately lowering the thick-wall guide pipe to the other guide conical surface through a positioning mechanism, and repeating the operation; the guide device can be used for inserting six micro-pipes into the hydrate reservoir through six guide holes in one setting.
(5) And lifting the central pipe column, carrying out deblocking operation on the guide device, lifting the guide device, then putting the guide device to the other well section of the hydrate reservoir, setting the outlet of the guide hole corresponding to the perforation channel, and repeating the microtube arrangement operation. After the micro-pipe arrangement operation is finished, lifting the guide device away from the production well; finally, a micro-pipe network with uniform, certain spacing and spatial distribution is formed in the whole hydrate reservoir well section.
The invention has the following beneficial effects:
1) The device has the advantages of flexible operation and convenient use, is easy to arrange the microtube network for enlarging the contact area of the production channel and the hydrate reservoir in the seabed shallow natural gas hydrate reservoir with weak cementation degree, looseness and low strength, and simultaneously ensures that the microtube channel (namely the production channel) is not blocked.
2) The micro-pipe network arranged in the hydrate reservoir effectively enlarges the contact area between the production channel and the hydrate reservoir, thereby improving the permeability of the reservoir, improving the heat and mass transfer efficiency and the flow conductivity of the reservoir, and achieving the purposes of improving the exploitation efficiency and realizing the economic and efficient exploitation of the marine shallow natural gas hydrate.
3) The invention is suitable for various marine natural gas hydrate exploitation methods such as a depressurization method, a heat shock method, a chemical reagent injection method and the like, can combine various hydrate exploitation methods, fully exerts respective advantages and obviously improves the yield-increasing effect.
Drawings
FIG. 1 is a schematic diagram of the apparatus for increasing the yield of marine shallow natural gas hydrate microtubules according to the present invention.
Fig. 2 is a top view of the guide of the present invention.
Wherein: 1. a guide device; 2. a wellhead assembly; 3. a central tubular string; 4. a cable; 5. a thick walled catheter; 6. a microtube; 7. a pilot bit; 8. a central channel; 9. a seating mechanism; 10. an inclined hole; 11. an electrochemical cutter; 12. a positioning mechanism; 13. a guiding conical surface; 14. a guide hole; 15. a production well is produced; 16. a sleeve; 17. and (4) a perforation channel.
A-overburden stratum, B-hydrate reservoir stratum and C-overburden stratum.
Detailed Description
As shown in figures 1 and 2, the microtube yield-increasing device for the marine shallow natural gas hydrate, provided by the invention, comprises a guide device 1, a wellhead device 2, a center pipe column 3, a cable 4, a thick-wall guide pipe 5, a microtube 6 and a guide drill bit 7.
The guiding device 1 comprises a central channel 8, a seat sealing mechanism 9, an inclined hole 10, an electrochemical cutter 11, a positioning mechanism 12, a guiding conical surface 13 and a guiding hole 14; the guide holes 14 are circular channels with proper curvature, six guide holes 14 are arranged, and the six guide holes 14 are symmetrically distributed around the central channel 8; six electrochemical cutters 11 are arranged, and the six electrochemical cutters 11 are respectively connected with the outlets of the six guide holes 14 and are used for cutting the microtube 6. The central pipe column 3 is used for connecting the central passage 8 of the guiding device 1, lowering the guiding device 1 to the production well 15, and is used for setting and unsetting the guiding device 1. The cable 4 is connected to the electrochemical cutter 11 through the center tube stub 3, the central passage 8, and the angled hole 10. The positioning mechanism 12 plays a role in guiding and positioning, the thick-wall catheter 5 is accurately located on the guiding conical surface 13 through the positioning mechanism 12, and the conical surface of the thick-wall catheter 5 is matched with the guiding conical surface 13. The wellhead assembly 2 is arranged at a wellhead, and the wellhead assembly 2 provides a vertical downward feeding force for the microtubes 6 when the microtubes are arranged. The annular gap between the micro-tube 6 and the thick-wall guide pipe 5 is smaller than the outer diameter of the micro-tube 6, so that the micro-tube 6 is prevented from buckling in the channel of the thick-wall guide pipe 5, and the smooth arrangement operation of the micro-tube is ensured. The tail end port of the micro-pipe 6 is provided with a guide drill bit 7 for extruding and crushing the hydrate reservoir stratum B during the micro-pipe arrangement operation. The micro-pipe 6 is a high-pressure resistant steel pipe with certain flexibility, the outer wall of the micro-pipe 6 is provided with holes with the same aperture, and the holes are round holes with certain sizes, so that a micro-pipe channel (namely an output channel) is not blocked in the mining process; the micro-tube 6 has an outer diameter ranging from 15mm to 35mm.
The invention relates to a yield increasing method for marine shallow natural gas hydrate, which comprises the following steps:
1) Constructing a production well 15: drilling a vertical borehole in a marine shallow natural gas hydrate reservoir region, penetrating an overlying stratum A, stopping drilling, running a casing 16 for cementing and well cementing after drilling to the vicinity of the top boundary of a hydrate reservoir B, then drilling through the hydrate reservoir B to the top boundary of a natural gas hydrate underlying stratum C, directly running perforating equipment for perforating without performing well cementing operation after running the casing 16, and forming perforating channels 17 with uniform intervals on the well section of the whole hydrate reservoir; after a period of time, the perforation channels 17 gradually close, creating fracture zones distributed along the perforation channels 17.
2) And (3) micro-pipe arrangement operation:
(1) and (3) lowering a guide device: the centre string 3 is connected to the centre passage 8 of the guide device 1, and the guide device 1 is lowered through the centre string 3 to the section of the hydrate reservoir B, and the outlet of the guide hole 14 corresponds to the perforation passage 17.
(2) Setting operation: the seat sealing mechanism 9 in the guiding device 1 adopts a mechanical seat sealing mode, and the guiding device 1 is sealed on the inner wall of the casing 16 by actions of rotating, lowering and lifting the center pipe column 3 and the like.
(3) Arranging a micro tube: firstly, a thick-wall guide pipe 5 is placed from a wellhead of a production well 15 to a guide device 1, the thick-wall guide pipe 5 is accurately located on a guide conical surface 13 through a positioning mechanism 12, and the conical surface of the thick-wall guide pipe 5 is matched with the guide conical surface 13; then, a micro-tube 6 is put into the guide device 1 through the thick-wall guide tube 5, the micro-tube 6 enters the guide hole 14 in the guide device 1 along the inner channel of the thick-wall guide tube 5, and the annular gap between the micro-tube 6 and the thick-wall guide tube 5 is smaller than the outer diameter of the micro-tube, so that the micro-tube can be prevented from buckling in the thick-wall guide tube; finally, under the action of vertical downward feeding force provided by the wellhead device 2, the micro-pipe 6 passes through the guide hole 14 with proper curvature and then horizontally enters the hydrate reservoir B along the crushing area of the perforation channel 17, and under the guiding action of the crushing area of the perforation channel 17, the guide drill bit 7 extrudes the crushed hydrate reservoir B to gradually penetrate into the hydrate reservoir B until reaching the preset depth, wherein the depth range is 10m-20m.
(4) Cutting the microtubules: the cable 4 is connected to the electrochemical cutters 11 through the central pipe column 3, the central channel 8 and the inclined holes 10, and the six electrochemical cutters 11 are respectively connected with the outlets of the six guide holes 14; pumping a KCL aqueous solution from a wellhead, leading the KCL aqueous solution to reach an electrochemical cutter 11 through a central pipe column 3, a central channel 8 of a guiding device and an inclined hole 10, then electrifying the cable 4, and carrying out electrochemical cutting on the microtube 6 by using direct current power supply; after cutting the microtube 6, the remaining part is lifted off the thick-walled catheter 5 channel, and the first microtube placement operation is finished. Then, lifting the thick-walled catheter 5 for a certain distance, accurately lowering the thick-walled catheter to the other guiding conical surface 13 through the positioning mechanism 12, and repeating the operation; the guide device 1 can insert six microtubes 6 into the hydrate reservoir B through six guide holes 14 in one setting.
(5) And lifting the central pipe column 3, carrying out deblocking operation on the guide device 1, lifting the guide device 1, then lowering the guide device 1 to the other well section of the hydrate reservoir B, setting the outlet of the guide hole 14 corresponding to the perforation channel 17, and repeating the microtube arrangement operation. After the micro-pipe arrangement operation is finished, lifting the guide device 1 away from the production well 15; finally, a micro-pipe network with uniform, certain spacing and spatial distribution is formed in the whole hydrate reservoir B well section.
Claims (4)
1. A shallow layer natural gas hydrate microtubule of ocean increases output device which characterized in that: the device consists of a guide device (1), a wellhead device (2), a central pipe column (3), a cable (4), a thick-wall guide pipe (5), a micro pipe (6) and a guide drill bit (7);
the guide device (1) comprises a central channel (8), a seat sealing mechanism (9), an inclined hole (10), an electrochemical cutter (11), a positioning mechanism (12), a guide conical surface (13) and a guide hole (14); the guide holes (14) are circular channels, six guide holes (14) are arranged, and the six guide holes (14) are symmetrically distributed around the central channel (8); six electrochemical cutters (11) are arranged, and the six electrochemical cutters (11) are respectively connected with outlets of the six guide holes (14) and are used for cutting the microtubes (6); the central pipe column (3) is used for connecting a central passage (8) of the guide device (1), lowering the guide device (1) to a production well (15), and performing setting and unsealing operation on the guide device (1); the cable (4) is connected to the electrochemical cutter (11) through the center pipe column (3), the center channel (8) and the inclined hole (10); the positioning mechanism (12) plays a role in guiding and positioning, the thick-wall catheter (5) is accurately positioned on the guiding conical surface (13) through the positioning mechanism (12), and the conical surface of the thick-wall catheter (5) is matched with the guiding conical surface (13);
the wellhead device (2) is arranged at a wellhead, and the wellhead device (2) provides vertical downward feeding force for the micro-pipe (6) when the micro-pipe (6) is arranged; the annular gap between the micro-tube (6) and the thick-wall guide tube (5) is smaller than the outer diameter of the micro-tube (6), and a guide drill bit (7) is arranged at the tail end port of the micro-tube (6); the outer wall of the microtube (6) is provided with holes with the same aperture.
2. The marine superficial natural gas hydrate microtubule stimulation device according to claim 1, which is characterized in that: the micro-pipe (6) is a high-pressure resistant steel pipe.
3. The marine superficial natural gas hydrate microtubule stimulation device according to claim 1, which is characterized in that: the outer diameter of the micro-tube (6) is 15mm-35mm.
4. The stimulation method of the marine superficial natural gas hydrate stimulation device of claim 1, comprising the steps of:
1) Constructing a production well (15): drilling a vertical borehole in a marine shallow natural gas hydrate reservoir region, penetrating an overlying stratum (A), stopping drilling, setting a casing (16) for cementing and well cementing after drilling to the position near the top boundary of a hydrate reservoir (B), drilling through the hydrate reservoir (B) to the top boundary of a natural gas hydrate underlying stratum (C), directly setting perforating equipment for perforating without performing well cementing operation after setting the casing (16), and forming perforating channels (17) with uniform intervals in the whole hydrate reservoir well section; after a period of time, the perforation channel (17) is gradually closed to form crushing zones distributed along the perforation channel (17);
2) Arranging and operating the micro-pipes:
(1) lowering a guide device: the center pipe column (3) is connected to a center channel (8) of the guiding device (1), the guiding device (1) is lowered to a well section of the hydrate reservoir (B) through the center pipe column (3), and an outlet of the guiding hole (14) corresponds to the perforation channel (17);
(2) setting operation: a seat sealing mechanism (9) in the guide device (1) adopts a mechanical seat sealing mode, and the guide device (1) is sealed on the inner wall of the casing (16) in a seat way through actions of rotating, lowering and lifting the central pipe column (3) and the like;
(3) arranging a micro tube: firstly, a thick-wall guide pipe (5) is placed from the wellhead of a production well (15) to a guide device (1), the thick-wall guide pipe (5) is accurately located on a guide conical surface (13) through a positioning mechanism (12), and the conical surface of the thick-wall guide pipe (5) is matched with the guide conical surface (13); then, a micro-tube (6) is put into the guide device through the thick-wall guide tube (5), the micro-tube (6) enters a guide hole (14) in the guide device (1) along an inner channel of the thick-wall guide tube (5), and an annular gap between the micro-tube (6) and the thick-wall guide tube (5) is smaller than the outer diameter of the micro-tube, so that the micro-tube can be prevented from buckling in the thick-wall guide tube; finally, under the action of vertical downward feeding force provided by the wellhead device (2), the micro-pipe (6) passes through a guide hole (14) with proper curvature and then horizontally enters the hydrate reservoir stratum (B) along the crushing area of the perforation channel (17), and under the guiding action of the crushing area of the perforation channel (17), the guide drill bit (7) extrudes the crushed hydrate reservoir stratum and gradually penetrates into the hydrate reservoir stratum (B) until the preset depth is reached, wherein the depth range is 10m-20m;
(4) cutting the microtubes: the cable (4) is connected to the electrochemical cutters (11) through the central pipe column (3), the central channel (8) and the inclined holes (10), and the six electrochemical cutters (11) are respectively connected with outlets of the six guide holes (14); pumping a KCL aqueous solution from a wellhead, leading the KCL aqueous solution to reach an electrochemical cutter (11) through a central pipe column (3), a central channel (8) of a guide device and an inclined hole (10), then electrifying a cable (4), and carrying out electrochemical cutting on a microtube (6) by using direct current power supply; after the micro-pipe (6) is cut off, the rest part is lifted away from the channel of the thick-wall guide pipe (5), and the first micro-pipe arrangement operation is finished; then, lifting the thick-wall guide pipe (5) for a certain distance, accurately lowering the thick-wall guide pipe to the other guide conical surface (13) through a positioning mechanism (12), and repeating the operation; six micro-pipes (6) can be inserted into the hydrate reservoir stratum (B) through six guide holes (14) by one-time setting of the guide device (1);
(5) lifting the central pipe column (3), carrying out deblocking operation on the guiding device (1), lifting or lowering the guiding device (1) to the other well section of the hydrate reservoir (B), setting the outlet of the guiding hole (14) corresponding to the perforation channel (17), and repeatedly carrying out microtubule arrangement operation; after the microtube arrangement operation is finished, lifting the guide device (1) away from the production well (15); finally, a uniform, spaced and spatially distributed micro-pipe network is formed in the whole hydrate reservoir (B) well section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710211075.8A CN106837259B (en) | 2017-04-01 | 2017-04-01 | Device and method for increasing yield of marine shallow natural gas hydrate microtubules |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710211075.8A CN106837259B (en) | 2017-04-01 | 2017-04-01 | Device and method for increasing yield of marine shallow natural gas hydrate microtubules |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106837259A CN106837259A (en) | 2017-06-13 |
| CN106837259B true CN106837259B (en) | 2023-02-17 |
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