CN109826564B - Seabed shallow rapid vertical well forming device and method for continuously casing by using suction anchor - Google Patents
Seabed shallow rapid vertical well forming device and method for continuously casing by using suction anchor Download PDFInfo
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- CN109826564B CN109826564B CN201910148706.5A CN201910148706A CN109826564B CN 109826564 B CN109826564 B CN 109826564B CN 201910148706 A CN201910148706 A CN 201910148706A CN 109826564 B CN109826564 B CN 109826564B
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- 238000000034 method Methods 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 52
- 239000002002 slurry Substances 0.000 claims description 26
- 239000004576 sand Substances 0.000 claims description 12
- 239000002689 soil Substances 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 10
- 238000005507 spraying Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000005553 drilling Methods 0.000 description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Natural products C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 5
- 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 description 5
- 239000003345 natural gas Substances 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- -1 Natural gas hydrates Chemical class 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
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Abstract
The application provides a submarine shallow rapid vertical well device for continuously running a sleeve by utilizing a suction anchor, which comprises a guide anchor, an anchor cover and a plurality of sleeves, wherein the guide anchor comprises a cylinder body, a first drill rod connecting frame and a first suction water pipe, the upper end of the cylinder body is provided with an end cover opening, the lower end of the cylinder body is provided with an opening, the end cover opening is provided with a circular end cover in threaded connection, and the upper part of the end cover is connected with the first drill rod connecting frame; the anchor cover comprises a round anchor cover body, a second drill rod connecting frame and a second suction water pipe, an annular accommodating groove is formed in the circumference of the anchor cover body, a plurality of springs are arranged in the accommodating groove along the radial direction of the anchor cover body, the inner end of each spring is connected with the anchor cover body, and the outer end of each spring is connected with a clamping tenon; threads are arranged at two ends of the sleeve, and ratchets are arranged on the inner wall of the sleeve. The application has the beneficial effects that: the suction anchor is utilized to quickly form a vertical well by utilizing the negative pressure principle, so that the requirement of the shallow hydrate exploitation on the vertical well is met, the construction process is simple and convenient, and the construction period can be shortened.
Description
Technical Field
The application relates to the technical field of exploitation of seabed natural gas hydrate, in particular to a seabed shallow rapid vertical well device for continuously running a casing by utilizing a suction anchor.
Background
Natural gas hydrates are ice-like crystalline substances formed from natural gas and water under high pressure and low temperature conditions, which are distributed in deep sea sediments or permanent frozen soil of land areas. The method has high resource density, wide global distribution and extremely high resource value. It is estimated that the total energy of natural gas hydrates in the world is about 2-3 times the sum of coal, oil, and gas. Therefore, the development of natural gas hydrate is of great significance for relieving the current situation of shortage of oil and gas resources. Since the 60 s of the last century, natural gas hydrate exploration and development programs have been developed in some countries, represented by the united states, japan, germany, china, korea and india. To date, a large array of natural gas hydrate hot spot research areas have emerged from offshore and frozen earth areas where hydrate sites exceed 230. The exploitation of hydrates is also an important point and a hot spot of research in various countries, and the development and utilization of natural gas hydrates are necessary trends in the future.
The existing method for exploiting natural gas hydrate into a vertical well is mostly similar to petroleum drilling engineering, the well body structure is complex, the drilling size is often required to be reduced for many times, tools such as drilling rods, drilling bits, casing pipes and the like with various matched sizes are required, the investment is large, shallow hydrate exploitation with shallow buried depth is slightly wasted, in conventional marine drilling, the drilling, well cementation and well completion processes are required to be carried out, the well body structure is complex, the suction anchor technology is firstly applied to the United kingdom in 1958, and the method is suitable for the requirement of omnibearing anchoring capacity of the mail wheel mooring. The research on the negative pressure principle in China starts in the 70 th century, and the practical application of the negative pressure principle is subjected to a complex process. The most adopted suction anchors in practical engineering adopt a steel barrel-shaped structure with a closed upper end and an open lower end. The side wall of the anchor barrel is made of steel, the top of the anchor barrel is made of steel or reinforced concrete, and a water pumping hole is reserved for connecting a water pumping pipeline. The suction anchor is firstly sunk into the sea floor by a certain depth under the dead weight, a closed space is formed in the barrel, and the anchor body is pressed into the soil by pumping the negative pressure difference between the water in the anchor barrel and the outside of the barrel.
Disclosure of Invention
The application aims at exploiting shallow hydrate on the ocean bottom, and provides a device and a method for quickly, efficiently and economically forming a vertical well in a hydrate overlying stratum with a relatively loose structure, which are simple in structure, simple and convenient to operate and good in reliability by utilizing a suction anchor technology.
The embodiment of the application provides a seabed shallow rapid vertical well device for continuously running a casing by using a suction anchor.
The embodiment of the application provides a seabed shallow rapid vertical well device for continuously casing by using a suction anchor, which comprises a guide anchor, an anchor cover and a plurality of casings,
the guide anchor comprises a barrel, a first drill pipe connecting frame and a first suction water pipe, wherein an end cover opening is formed in the upper end of the barrel, an end cover opening is formed in the lower end of the barrel, a circular end cover in threaded connection is arranged at the end cover opening, the upper part of the end cover is connected with the first drill pipe connecting frame, the lower end of the first suction water pipe penetrates through the end cover, the first drill pipe connecting frame is used for connecting a drill pipe, the drill pipe is placed down into the barrel and is sunk into a seabed, and the first suction water pipe is used for sucking muddy sand and water in the barrel;
the anchor cover comprises a round anchor cover body, a second drill rod connecting frame and a second suction water pipe, wherein an annular accommodating groove is formed in the circumference of the anchor cover body, a plurality of springs are radially arranged in the accommodating groove along the anchor cover body, the inner end of each spring is connected with the anchor cover body, the outer end of each spring is connected with a clamping tenon, the lower part of the second drill rod connecting frame is connected with the anchor cover body, the lower end of the second suction water pipe penetrates through the anchor cover body, the second drill rod connecting frame is used for connecting the anchor cover body so that the anchor cover body can move in the sleeve, and the second suction water pipe is used for sucking mud sand and water in the sleeve;
the sleeve is characterized in that threads are arranged at two ends of the sleeve, ratchets are arranged on the inner wall of the sleeve, the sleeve can slide along the inner wall of the cylinder, the anchor cover is arranged in the sleeve, the clamping tenons are matched with the ratchets to enable the anchor cover body to move upwards along the inner wall of the sleeve, and any two of the sleeves can be connected through threads.
Further, the anchor cover body comprises an upper cover, a middle cover and a lower cover which are all round, the diameter of the upper cover and the diameter of the lower cover are both larger than those of the middle cover, the upper cover is connected to the upper portion of the middle cover, the lower cover is connected to the lower portion of the middle cover, the accommodating groove is formed in the periphery of the circumference of the middle cover between the upper cover and the lower cover, the inner end of the spring is connected with the circumference of the middle cover, the outer end of the spring is connected with the clamping tenon, the clamping tenon is extruded by the ratchet to enable the spring to shrink, and accordingly the anchor cover body can move upwards along the inner wall of the sleeve.
Further, the circumferences of the upper cover and the lower cover are respectively provided with a sealing ring.
Further, the lower end of the second drill rod connecting frame penetrates through the upper cover, the middle cover and the lower cover and is fixedly connected with the upper cover, the middle cover and the lower cover into a whole, and the second suction water pipe comprises a plurality of branch pipes which are mutually communicated.
Further, four clamping tenons are uniformly arranged outside the circumference of the middle cover.
Further, the cylinder body comprises an outer cylinder and an inner cylinder, the inner cylinder is longer than the outer cylinder, the upper part of the outer cylinder is connected with the upper part of the inner cylinder, an upper port of the inner cylinder is an end cover port, and the end cover port is in threaded connection with the end cover.
Further, four grippers which are orthogonally distributed are arranged at the lower part of the first drill rod connecting frame, all grippers are fixedly connected with the end cover, and the drill rod is rotationally detached from the end cover.
Further, ribs are arranged on the outer wall of the inner cylinder.
The embodiment of the application also provides a method for quickly forming a vertical well on the seabed shallow layer by using the suction anchor to continuously lower the casing, which comprises the following steps of:
s1, the guide anchor is connected with a drill rod and then is lowered to the sea floor, the lower end of the cylinder penetrates into a stratum, and a closed space is formed in the cylinder;
s2, connecting the first suction water pipe with a slurry pump, starting the slurry pump to suck the sand and water in the cylinder, reducing the pressure in the cylinder to generate internal and external pressure differences, enabling the internal and external pressure differences of the cylinder to enable the guide anchor to be arranged at the lower layer, simultaneously lowering the drill rod until the cylinder is completely immersed into a stratum, closing the slurry pump, and rotating the drill rod to enable the end cover to be separated from the cylinder;
s3, selecting one sleeve as a head sleeve, putting the anchor cover into the sleeve from the lower end of the head sleeve, connecting the drill rod, lifting the anchor cover to the upper port of the head sleeve, and lowering the head sleeve into the guide anchor, wherein the anchor cover seals the cylinder;
s4, connecting the second suction water pipe with the slurry pump, starting the slurry pump, sucking out the slurry sand and water in the first-section sleeve, and forming a pressure difference inside and outside the first-section sleeve to loosen soil contacted with the bottom of the first-section sleeve, so that the first-section sleeve continuously sinks, and closing the slurry pump until the first-section sleeve is separated from the guide anchor, wherein the first-section sleeve stops sinking;
s5, selecting one sleeve as a rear sleeve, lowering the rear sleeve into the guide anchor along the drill rod, connecting the rear sleeve with the head sleeve, lifting the drill rod, enabling the anchor cover to move to the upper port of the rear sleeve, sealing the rear sleeve and the head sleeve by the anchor cover, and repeating the step S4;
s6, repeating the step S5 for a plurality of times, and forming a well.
Further, the step S6 further includes turning off the slurry pump, injecting water into the second suction water pipe, spraying soil body into the inner jet of the subsequent section of casing by the second suction water pipe, and restarting the slurry pump.
The technical scheme provided by the embodiment of the application has the beneficial effects that: according to the submarine shallow rapid vertical well device for continuously setting the sleeve by using the suction anchor, the guide anchor is sunk into the stratum to form the guide hole, the sleeve is continuously sunk by using the internal and external pressure difference to rapidly form the vertical well, the requirement of vertical well making by exploiting shallow hydrate is met, for a hydrate reservoir with shallow buried depth, the structure of the overlying stratum is loose, the sleeve penetrating into the vertical well is feasible by using the negative pressure principle, the construction process is simple and convenient by using the negative pressure principle of the suction anchor, the construction period can be shortened, the conventional drilling process of ocean well is avoided, the drilling, well cementation and well completion processes are generally required, the well body structure is complex, and the vertical well with uniform well diameter can be rapidly completed by using the application aiming at the vertical well making process of exploiting shallow hydrate.
Drawings
FIG. 1 is a schematic view of a guide anchor 1 of a device for quickly forming a vertical well on a seabed for continuously running a casing by using a suction anchor;
FIG. 2 is a schematic view of an anchor cap 2 of a subsea shallow rapid vertical well device utilizing a suction anchor to continuously run a casing;
FIG. 3 is a schematic illustration of a casing 3 of a subsea shallow rapid vertical well device of the present application utilizing a suction anchor to continuously lower the casing;
fig. 4 is a schematic view of the lowering of the guide anchor 1;
figure 5 is a schematic illustration of the sinking of the steering anchor 1 into the seabed 4;
fig. 6 is a schematic view of the pilot anchor 1 with the end cap 15 removed;
fig. 7 is a schematic view of the connection of the sleeve 3 and the anchor cap 2;
FIG. 8 is a schematic illustration of the setting of the first casing section;
FIG. 9 is a schematic illustration of the connection of a first section of casing with a subsequent section of casing;
fig. 10 is a schematic view of the anchor cap 2 raised;
FIG. 11 is a schematic illustration of the jet of anchor cap 2;
fig. 12 is a schematic of a well formation.
In the figure: 1-guide anchor, 11-outer cylinder, 12-inner cylinder, 13-first drill pipe connecting frame, 14-first suction water pipe, 15-end cover, 16-rib, 17-tongs, 2-anchor cover, 21-upper cover, 22-middle cover, 23-lower cover, 24-second drill pipe connecting frame, 25-second suction water pipe, 26-spring, 27-trip, 28-sealing ring, 29-branch pipe, 3-sleeve pipe, 31-ratchet, 32-thread and 4-seabed.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be further described with reference to the accompanying drawings.
The embodiment of the application provides a submarine shallow rapid vertical well device for continuously casing by using a suction anchor, which comprises a guide anchor 1, an anchor cover 2 and a plurality of casings 3.
Referring to fig. 1, the guide anchor 1 includes a barrel, a first drill pipe connecting frame 13 and a first suction pipe 14, the barrel is a double-layer barrel with an open bottom and a closed top, and includes an outer barrel 11 and an inner barrel 12, the inner barrel 12 is longer than the outer barrel 11, the upper portion of the outer barrel 11 is connected with the upper portion of the inner barrel 12, the upper port of the inner barrel 12 is an end cap opening, a circular end cap 15 in threaded connection with the end cap opening is provided at the end cap opening, four grippers 17 in orthogonal distribution are provided at the lower portion of the first drill pipe connecting frame 13, all grippers 17 are fixedly connected with the end cap 15, a drill pipe can be connected to the upper portion of the first drill pipe connecting frame 13, the drill pipe is rotated to drive the end cap 15 to rotate to detach the guide anchor 1, and ribs 16 protruding outwards are provided on the outer wall of the inner barrel 12, and the ribs 16 and the soil body are extruded when the inner barrel 12 is sunk into the soil body, so that the guide anchor 1 can be prevented from rotating. The lower end of the first water sucking pipe 14 penetrates through the end cover 15 to be connected into the inner cylinder 12, and the first water sucking pipe 14 is used for sucking mud sand and water in the inner cylinder 12.
Referring to fig. 2, the anchor cap 2 includes a circular anchor cap body, a second drill pipe connecting frame 24, and a second suction pipe 25, where the anchor cap body includes an upper cap 21, a middle cap 22, and a lower cap 23, the diameters of the upper cap 21 and the lower cap 23 are both greater than the diameter of the middle cap 22, the upper portion of the middle cap 22 is connected to the upper cap 21, the lower portion is connected to the lower cap 23, four springs 26 are disposed in the circular receiving groove along the radial direction of the middle cap 22, the inner end of each spring 26 is connected to the circumference of the middle cap 22, the outer end of each spring is connected to a latch 27, the four latches 27 are uniformly distributed around the circumference of the middle cap 22, the latch 27 is a wedge-shaped block, and the wedge-shaped surface is disposed upwards, the latch 27 moves toward the middle cap 22 when being forced, the springs 26 are pressed until completely retracted in the receiving groove, the sealing ring 28 is disposed on the circumference of the sealing ring 2, and the sealing ring 28 is disposed on the sealing ring 2.
The lower end of the second drill pipe connecting frame 24 penetrates through the upper cover 21, the middle cover 22 and the lower cover 23 and is fixedly connected with the upper cover 21, the upper end of the second drill pipe connecting frame 24 can be connected with the drill pipe and used for lowering the sleeve 3 into the inner cylinder 12, the second suction water pipe 25 comprises five branch pipes 29 which are mutually communicated, one branch pipe 29 is a central branch pipe, the other four branch pipes 29 are uniformly distributed around the central branch pipe, and the second suction water pipe 25 is used for sucking muddy sand and water in the sleeve 3 and injecting water jet into the sleeve 3.
Referring to fig. 3, the sleeve 3 is a hollow cylinder, two ends of the sleeve are provided with threads 32, one section is an internal thread, the other end is provided with an external thread, the inner wall is provided with a ratchet 31, the section of the ratchet 31 is a right triangle and can be matched with the wedge surface of the latch 27, the sleeve 3 can slide along the inner wall of the inner cylinder 12, the outer diameter of the sleeve 3 is equal to the inner diameter of the inner cylinder 12, the latch 27 is extruded by the ratchet 31 to enable the spring 26 to shrink, so that the anchor cover body can slide from bottom to top along the inner wall of the sleeve 3, the ratchet 31 blocks the anchor cover body from moving downwards, and any two sleeves 3 can be connected in a threaded manner.
The embodiment of the application also provides a method for quickly forming a vertical well on the seabed shallow layer by using the suction anchor to continuously lower the casing, which comprises the following steps of:
s1 referring to FIG. 4, the guide anchor 1 is connected with a drill rod and then lowered to the sea floor, the lower end of the inner cylinder 12 penetrates into a stratum, and a closed space is formed between the inner cylinder 12 and the sea floor 4;
s2, referring to FIGS. 5 and 6, the first suction pipe 14 is connected with a slurry pump, the slurry pump is started to suck and seal the muddy sand and water in the inner cylinder 12, the internal pressure of the inner cylinder 12 is reduced, the pressure difference between the inside and the outside of the inner cylinder 12 enables the guide anchor 1 to be arranged at the lower layer, meanwhile, the drill rod is lowered until the inner cylinder 12 is completely immersed into the stratum, the slurry pump is closed, the drill rod is rotated to enable the end cover 15 and the inner cylinder 12 to be separated, the drill rod is taken down, at the moment, a guide hole is formed in the middle of the guide anchor 1, and the space position of the sleeve 3 can be stabilized in the process of subsequently sinking the sleeve 3;
s3 referring to FIG. 7 and FIG. 8, selecting a sleeve 3 as a first sleeve, putting the anchor cap 2 into the sleeve 3 from the lower end of the first sleeve 3, connecting the upper end of the anchor cap 2 with the drill rod, lifting the anchor cap 2 to the upper port of the first sleeve 3, and lowering the first sleeve 3 into the guide anchor 1 due to the cooperation of the ratchet 31 and the clamping tenon 27, wherein the outer wall of the sleeve 3 is tightly attached to the inner wall of the inner barrel 12, and the anchor cap 2 seals the sleeve 3;
s4, connecting the second suction water pipe 25 with the slurry pump, starting the slurry pump, sucking out the mud sand and water in the first section sleeve 3, forming a pressure difference between the inside and the outside of the first section sleeve 3, loosening soil contacted with the bottom of the first section sleeve 3 due to seepage of water, and reducing the effective stress of the soil at the bottom so as to enable the first section sleeve 3 to continuously sink until the upper end of the first section sleeve 3 is separated from the guide anchor 1, closing the slurry pump, and stopping sinking the first section sleeve 3;
s5 referring to FIGS. 9 and 10, selecting one sleeve 3 as a next sleeve, lowering the next sleeve 3 into the guide anchor 1, screwing the next sleeve 3 with the first sleeve 3, lifting the drill rod, moving the anchor cover 2 up to the upper port of the next sleeve 3, sealing the next sleeve 3 and the first sleeve 3 by the anchor cover 2, and repeating the step S4;
s6, repeating the step S5 for a plurality of times, so that a plurality of the casings 3 are continuously sunk into the stratum one by one and are mutually connected to form a well.
Referring to fig. 11 and 12, step S6 further includes, after the casing 3 is submerged to a certain depth, turning off the slurry pump, injecting water into the second suction pipe 25, spraying the soil into the subsequent casing 3 through the second suction pipe 25, restarting the slurry pump, pumping out the silt and water, reducing the friction force of the soil in the casing 3 and increasing the negative pressure difference, so as to facilitate further injection. When the casing 3 is penetrated into the hydrate reservoir, the mud pump is turned off, the anchor cap is pulled out through the drill pipe, and the casing 3 is left in the stratum to form a borehole.
In this document, terms such as front, rear, upper, lower, etc. are defined with respect to the positions of the components in the drawings and with respect to each other, for clarity and convenience in expressing the technical solution. It should be understood that the use of such orientation terms should not limit the scope of the claimed application.
The embodiments described above and features of the embodiments herein may be combined with each other without conflict.
The foregoing description of the preferred embodiments of the application is not intended to limit the application to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the application are intended to be included within the scope of the application.
Claims (8)
1. A submarine shallow rapid vertical well device for continuously running a sleeve by using a suction anchor is characterized in that: comprises a guide anchor, an anchor cover and a plurality of sleeves,
the guide anchor comprises a barrel, a first drill pipe connecting frame and a first suction water pipe, wherein an end cover opening is formed in the upper end of the barrel, an end cover opening is formed in the lower end of the barrel, a circular end cover in threaded connection is arranged at the end cover opening, the upper part of the end cover is connected with the first drill pipe connecting frame, the lower end of the first suction water pipe penetrates through the end cover, the first drill pipe connecting frame is used for connecting a drill pipe, the drill pipe is placed down into the barrel and is sunk into a seabed, and the first suction water pipe is used for sucking muddy sand and water in the barrel;
the anchor cover comprises a round anchor cover body, a second drill rod connecting frame and a second suction water pipe, wherein an annular accommodating groove is formed in the circumference of the anchor cover body, a plurality of springs are radially arranged in the accommodating groove along the anchor cover body, the inner end of each spring is connected with the anchor cover body, the outer end of each spring is connected with a clamping tenon, the lower part of the second drill rod connecting frame is connected with the anchor cover body, the lower end of the second suction water pipe penetrates through the anchor cover body, the second drill rod connecting frame is used for connecting the anchor cover body so that the anchor cover body can move in the sleeve, and the second suction water pipe is used for sucking mud sand and water in the sleeve;
threads are arranged at two ends of the sleeve, ratchets are arranged on the inner wall of the sleeve, the sleeve can slide along the inner wall of the cylinder, the anchor cover is arranged in the sleeve, the clamping tenons are matched with the ratchets to enable the anchor cover body to move upwards along the inner wall of the sleeve, and any two sleeves can be connected through threads;
the anchor cover body comprises an upper cover, a middle cover and a lower cover which are all round, the diameter of the upper cover and the diameter of the lower cover are both larger than the diameter of the middle cover, the upper part of the middle cover is connected with the upper cover, the lower part of the middle cover is connected with the lower cover, the periphery of the circumference of the middle cover between the upper cover and the lower cover forms a containing groove, the inner end of a spring is connected with the circumference of the middle cover, the outer end of the spring is connected with a trip, and the trip is extruded by a ratchet to enable the spring to shrink, so that the anchor cover body can move upwards along the inner wall of the sleeve;
the barrel comprises an outer barrel and an inner barrel, the inner barrel is longer than the outer barrel, the upper part of the outer barrel is connected with the upper part of the inner barrel, an upper port of the inner barrel is an end cover port, the end cover port is in threaded connection with the end cover, the outer diameter of the sleeve is equal to the inner diameter of the inner barrel, and the sleeve can slide along the inner wall of the inner barrel.
2. The device for quickly forming a vertical well on a seabed for continuously casing by using a suction anchor as claimed in claim 1, wherein: the circumferences of the upper cover and the lower cover are respectively provided with a sealing ring.
3. The device for quickly forming a vertical well on a seabed for continuously casing by using a suction anchor as claimed in claim 1, wherein: the second drill rod connecting frame lower extreme runs through the upper cover, well lid with the lower cover to with three fixed connection as an organic whole, the second suction water pipe includes a plurality of bleeder that communicate each other.
4. The device for quickly forming a vertical well on a seabed for continuously casing by using a suction anchor as claimed in claim 1, wherein: four clamping tenons are uniformly arranged outside the circumference of the middle cover.
5. The device for quickly forming a vertical well on a seabed for continuously casing by using a suction anchor as claimed in claim 1, wherein: the lower part of the first drill rod connecting frame is provided with four grippers which are distributed in an orthogonal mode, all grippers are fixedly connected with the end cover, and the drill rod is rotationally detached from the end cover.
6. The device for quickly forming a vertical well on a seabed for continuously casing by using a suction anchor as claimed in claim 1, wherein: the outer wall of the inner barrel is provided with ribs.
7. A method for continuously running a casing pipe by utilizing a suction anchor for quickly forming a vertical well on a seabed shallow layer is characterized by comprising the following steps of: use of a shallow rapid vertical well device on the seabed for continuous casing running using a suction anchor as claimed in claim 1, comprising the steps of:
s1, the guide anchor is connected with a drill rod and then is lowered to the sea floor, the lower end of the cylinder penetrates into a stratum, and a closed space is formed in the cylinder;
s2, connecting the first suction water pipe with a slurry pump, starting the slurry pump to suck the sand and water in the cylinder, reducing the pressure in the cylinder to generate internal and external pressure differences, enabling the internal and external pressure differences of the cylinder to enable the guide anchor to be arranged at the lower layer, simultaneously lowering the drill rod until the cylinder is completely immersed into a stratum, closing the slurry pump, and rotating the drill rod to enable the end cover to be separated from the cylinder;
s3, selecting one sleeve as a head sleeve, putting the anchor cover into the sleeve from the lower end of the head sleeve, connecting the drill rod, lifting the anchor cover to the upper port of the head sleeve, and lowering the head sleeve into the guide anchor, wherein the anchor cover seals the cylinder;
s4, connecting the second suction water pipe with the slurry pump, starting the slurry pump, sucking out the slurry sand and water in the first-section sleeve, and forming a pressure difference inside and outside the first-section sleeve to loosen soil contacted with the bottom of the first-section sleeve, so that the first-section sleeve continuously sinks, and closing the slurry pump until the first-section sleeve is separated from the guide anchor, wherein the first-section sleeve stops sinking;
s5, selecting one sleeve as a rear sleeve, lowering the rear sleeve into the guide anchor along the drill rod, connecting the rear sleeve with the head sleeve, lifting the drill rod, enabling the anchor cover to move to the upper port of the rear sleeve, sealing the rear sleeve and the head sleeve by the anchor cover, and repeating the step S4;
s6, repeating the step S5 for a plurality of times, and forming a well.
8. The method for quickly forming a vertical well on the seabed for continuously casing by using a suction anchor as claimed in claim 7, wherein the method comprises the following steps: and the step S6 further comprises the steps of closing the slurry pump, injecting water into the second suction water pipe, spraying soil body into the inner jet flow of the next section of sleeve by the second suction water pipe, and restarting the slurry pump.
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| CN201910148706.5A CN109826564B (en) | 2019-02-28 | 2019-02-28 | Seabed shallow rapid vertical well forming device and method for continuously casing by using suction anchor |
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| CN201910148706.5A CN109826564B (en) | 2019-02-28 | 2019-02-28 | Seabed shallow rapid vertical well forming device and method for continuously casing by using suction anchor |
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