CN209799872U - Device for quickly forming vertical well on seabed shallow layer by utilizing continuous casing of suction anchor - Google Patents
Device for quickly forming vertical well on seabed shallow layer by utilizing continuous casing of suction anchor Download PDFInfo
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- CN209799872U CN209799872U CN201920253053.2U CN201920253053U CN209799872U CN 209799872 U CN209799872 U CN 209799872U CN 201920253053 U CN201920253053 U CN 201920253053U CN 209799872 U CN209799872 U CN 209799872U
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Abstract
The utility model provides a seabed shallow layer fast straight well device which utilizes a suction anchor to continuously lower a casing, comprising a guide anchor, an anchor cover and a plurality of casings, 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 port, the lower end of the cylinder body is provided with an opening, the end cover port is provided with a circular end cover connected by screw threads, and the upper part of the end cover is connected with the first drill rod connecting frame; the anchor cover comprises a circular 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; both ends of the sleeve are provided with threads, and the inner wall of the sleeve is provided with ratchets. The utility model has the advantages that: the vertical well is quickly formed by utilizing the negative pressure principle of the suction anchor, the requirements of shallow hydrate exploitation and vertical well construction are met, the construction process is simple and convenient, and the construction period can be shortened.
Description
Technical Field
The utility model relates to a seabed natural gas hydrate exploitation technical field especially relates to an utilize submarine shallow layer of continuous casing pipe of suction anchor to become straight well device fast.
Background
The natural gas hydrate is an ice-like crystalline substance which is distributed in deep sea sediments or permafrost in land areas and is formed by natural gas and water under high pressure and low temperature conditions. The resource density is high, the global distribution is wide, and the resource value is extremely high. 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 the natural gas hydrate has great significance for relieving the current situation of oil and gas resource shortage. Since the last 60 s, some countries, such as the united states, japan, germany, china, korea, and india, have developed a natural gas hydrate exploration and development plan. Heretofore, hydrate sites have been found to exceed 230 in offshore sea and permafrost regions, emerging as a large body of hot research areas for natural gas hydrates. The exploitation of hydrates is also a focus and hot spot of various countries, and the development and utilization of natural gas hydrates become necessary trends in the future.
The method used for exploiting the natural gas hydrate into the vertical well at present is mostly similar to the petroleum drilling engineering, the well body structure is complicated, often need to reduce the bore hole size many times, thus need tools such as drilling rod, drill bit, casing pipe of many supporting sizes, invest greatly, produce and slightly waste to the shallow layer hydrate that buries deeply shallowly, in the conventional marine drilling, generally need go through drilling, well cementation, completion process, and the well body structure is complicated, the suction anchor technology is applied to the great britain at first in 1958, the requirement of all-round anchorage ability suitable for mail ship mooring. The research of negative pressure principle in China begins in 70 s of the 20 th century, and the practical application of the negative pressure principle is subject to a complex process. In practical engineering, the most suction anchors are made of steel barrel-shaped structures with closed upper ends and open lower ends. The side wall material of the anchor barrel is made of steel, the top of the anchor barrel is generally made of steel or reinforced concrete, and a water pumping hole is reserved to be connected with a water pumping pipeline. The suction anchor is sunk into the seabed by a certain depth under the self-weight, a closed space is formed in the bucket, and the anchor is pressed into the soil by pumping water in the anchor bucket and forming negative pressure difference with the outer surface of the bucket.
SUMMERY OF THE UTILITY MODEL
The utility model aims at ocean bottom shallow hydrate exploitation, utilize suction anchor technique, provide a simple structure, easy and simple to handle, good reliability, realize device and method quick, high-efficient, the straight well of economic formation in the hydrate overburden that the structure is comparatively loose relatively.
the embodiment of the utility model provides an utilize submarine shallow layer of continuous casing pipe of suction anchor to become straight well device fast.
the embodiment of the utility model provides a seabed shallow layer rapid vertical well device which utilizes a suction anchor to continuously lower a sleeve, comprising a guide anchor, an anchor cover and a plurality of sleeves,
The guide anchor comprises a cylinder body, a first drill rod connecting frame and a first suction water pipe, wherein an end cover opening is formed in the upper end of the cylinder body, the lower end of the cylinder body is opened, a circular end cover in threaded connection is arranged on the end cover opening, the upper portion of the end cover is connected with the first drill rod connecting frame, the lower end of the first suction water pipe penetrates through the end cover, the first drill rod connecting frame is used for connecting a drill rod, the drill rod is lowered down to the cylinder body to be sunk into a seabed, and the first suction water pipe is used for sucking mud, sand and water in the cylinder body;
The anchor cover comprises a circular 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, the outer end of each spring is connected with a clamping tenon, the lower portion 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 to enable the anchor cover body to be capable of moving in the sleeve, and the second suction water pipe is used for sucking sand and water in the sleeve;
The anchor cover is arranged in the sleeve, the clamping tenon is matched with the ratchet teeth to enable the anchor cover body to move upwards along the inner wall of the sleeve, and any two sleeves can be in threaded connection.
further, the anchor cover body comprises an upper cover, a middle cover and a lower cover which are all circular, the diameter of the upper cover and the diameter of the lower cover are 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 circumference periphery of the middle cover between the upper cover and the lower cover forms the accommodating groove, 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 tenon, and the tenon is extruded by the ratchet to enable the spring to shrink, so that 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 provided with sealing rings.
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 communicated with each other.
Furthermore, four clamping tenons are uniformly arranged outside the circumference of the middle cover.
further, the barrel comprises an outer barrel and an inner barrel, the inner barrel is longer than the outer barrel, the upper portion of the outer barrel is connected with the upper portion of the inner barrel, an upper port of the inner barrel is an end cover port, and the end cover port is in threaded connection with the end cover.
Furthermore, the lower portion of the first drill rod connecting frame is provided with four orthogonally distributed grippers, all the grippers are fixedly connected with the end cover, and the drill rod rotates to dismount the end cover.
Furthermore, ribs are arranged on the outer wall of the inner barrel.
the embodiment of the utility model provides a beneficial effect that technical scheme brought is: the utility model discloses an utilize submarine shallow layer of suction anchor continuous casing pipe to become straight well device fast, the guide anchor sinks the stratum and forms the guiding hole, the sleeve pipe utilizes inside and outside pressure differential to continuously sink, become straight well fast, satisfy the shallow hydrate exploitation and make straight well demand, to the shallower hydrate reservoir of buried depth, it is more loose to cover the stratum structure on it, it is feasible to utilize the negative pressure principle to carry out the sleeve pipe and jet into the well, utilize the negative pressure principle of suction anchor, construction process is simple and easy convenient, can shorten construction period, avoided in the conventional marine drilling, generally need experience well drilling, well cementation, well completion process, and well body structure is complicated, and to the straight well process of making of shallow hydrate exploitation, use the utility model discloses can accomplish the straight well of a well footpath homogeneous fast.
Drawings
FIG. 1 is a schematic view of a guide anchor 1 of the present invention for a subsea shallow fast-alignment well installation using continuous casing of a suction anchor;
FIG. 2 is a schematic view of the anchor cap 2 of the present invention for a subsea shallow fast-alignment well device utilizing continuous casing of suction anchors;
FIG. 3 is a schematic view of the casing 3 of the present invention of a subsea shallow fast-alignment well device utilizing continuous casing of suction anchors;
Fig. 4 is a schematic view of the lowering of the guide anchor 1;
figure 5 is a schematic view of the guide anchor 1 being submerged into the seabed 4;
FIG. 6 is a schematic view of the guide 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 view of the lowering of the casing string;
FIG. 9 is a schematic view of the connection of the first casing section and the subsequent casing section;
FIG. 10 is a schematic view of the anchor cap 2 being lifted up;
FIG. 11 is a schematic view of the jet of the anchor cap 2;
FIG. 12 is a schematic illustration of well formation.
In the figure: 1-guide anchor, 11-outer cylinder, 12-inner cylinder, 13-first drill rod connecting frame, 14-first suction water pipe, 15-end cover, 16-rib, 17-gripper, 2-anchor cover, 21-upper cover, 22-middle cover, 23-lower cover, 24-second drill rod connecting frame, 25-second suction water pipe, 26-spring, 27-tenon, 28-sealing ring, 29-branch pipe, 3-sleeve pipe, 31-ratchet, 32-thread and 4-seabed.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be further described below with reference to the accompanying drawings.
the embodiment of the utility model provides an utilize submarine shallow layer quick straight well device of suction anchor continuous casing pipe, including direction anchor 1, anchor lid 2 and a plurality of sleeve pipe 3.
Referring to fig. 1, the guide anchor 1 includes a barrel, a first drill rod connecting frame 13 and a first suction water pipe 14, the barrel is a double-layer barrel with an open bottom and a closed top end, 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 end of the inner barrel 12 is an end cover opening, the end cover opening is provided with a circular end cover 15 in threaded connection therewith, the lower portion of the first drill rod connecting frame 13 is provided with four orthogonally distributed grippers 17, all the grippers 17 are fixedly connected with the end cover 15, the upper portion of the first drill rod connecting frame 13 can be connected with a drill rod, the drill rod rotates to drive the end cover 15 to rotate and detach the drill rod, and is used for lowering the guide anchor 1, the outer wall of the inner barrel 12 is provided with an outwardly convex rib 16, when the rib 12 falls into the soil body, the, the guide anchor 1 is prevented from rotating. The lower end of the first pumping water pipe 14 penetrates through the end cover 15 and is connected into the inner cylinder 12, and the first pumping water pipe 14 is used for pumping mud, sand and water in the inner cylinder 12.
referring to fig. 2, the anchor cover 2 includes a circular anchor cover body, a second drill rod connecting frame 24 and a second suction water pipe 25, the anchor cover body includes an upper cover 21, a middle cover 22 and a lower cover 23, the upper cover 21 and the lower cover 23 are circular, the diameter of the upper cover 21 and the diameter of the lower cover 23 are both greater than the diameter of the middle cover 22, the upper part of the middle cover 22 is connected with the upper cover 21, the lower part of the middle cover 22 is connected with the lower cover 23, an annular accommodating groove is formed around the circumference of the middle cover 22 between the upper cover 21 and the lower cover 23, four springs 26 are radially arranged in the accommodating groove along the middle cover 22, the inner end of each spring 26 is connected with the circumference of the middle cover 22, the outer end of each spring is connected with a wedge 27, the four wedge 27 are uniformly distributed around the circumference of the middle cover 22, the wedge 27 is a wedge block and is arranged facing upwards, and the wedge 27 moves towards the center of the middle cover 22 when being stressed, and the spring 26 is extruded until the spring is completely retracted into the accommodating groove, sealing rings 28 are arranged on the circumferences of the upper cover 21 and the lower cover 23, and the sealing rings 28 enhance the sealing effect of the anchor cover 2 and the sleeve 3.
The lower end of the second drill rod 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, the upper end of the second drill rod connecting frame 24 can be connected with the drill rod and is used for placing the casing 3 in the inner barrel 12, the second suction water pipe 25 comprises five branch pipes 29 which are communicated with each other, one branch pipe 29 is a central branch pipe, the other four branch pipes 29 surround the central branch pipe and are uniformly distributed, and the second suction water pipe 25 is used for sucking sand and water in the casing 3 and injecting water jet into the casing 3.
Referring to fig. 3, the sleeve 3 is a hollow cylinder, two ends of the sleeve are respectively provided with a thread 32, one end of the sleeve is an internal thread, the other end of the sleeve is an external thread, the inner wall of the sleeve is provided with a ratchet 31, the cross section of the ratchet 31 is a right triangle and can be matched with the wedge-shaped surface of the tenon 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 tenon 27 is squeezed by the ratchet 31 to contract the spring 26, so that the anchor cover body can slide along the inner wall of the sleeve 3 from bottom to top, 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 utility model provides a still provide a utilize the continuous seabed shallow layer of jacketing of suction anchor to become straight well method fast, use foretell utilize the continuous seabed shallow layer of jacketing of suction anchor to become straight well device fast, and include following step:
S1 referring to fig. 4, the guide anchor 1 is connected with a drill pipe and then lowered to the sea bottom, the lower end of the inner cylinder 12 penetrates into the ground, and a closed space is formed between the inside of the inner cylinder 12 and the sea bed 4;
s2 referring to fig. 5 and 6, connecting the first suction water pipe 14 to a mud pump, starting the mud pump to suck mud and sand and water in the inner barrel 12, reducing the internal pressure of the inner barrel 12, lowering the drill rod while the pressure difference between the inside and the outside of the inner barrel 12 makes the guide anchor 1 at the lower layer until the inner barrel 12 is completely sunk into the ground, turning off the mud pump, rotating the drill rod to separate the end cover 15 from the inner barrel 12, and removing the drill rod, wherein a guide hole is formed in the middle of the guide anchor 1, and the spatial position of the casing 3 can be stabilized in the subsequent sinking of the casing 3;
s3 referring to fig. 7 and 8, selecting a casing 3 as a first casing, placing the anchor cover 2 into the casing 3 from the lower end of the first casing 3, connecting the upper end of the anchor cover 2 to the drill pipe, lifting the anchor cover 2 to the upper end of the first casing 3, lowering the first casing 3 into the guide anchor 1 due to the cooperation of the ratchets 31 and the tenons 27, wherein the outer wall of the casing 3 is tightly attached to the inner wall of the inner cylinder 12, and the anchor cover 2 seals the casing 3;
S4, connecting the second suction water pipe 25 to the mud pump, starting the mud pump, and sucking out silt and water in the first casing 3, wherein a pressure difference is formed between the inside and the outside of the first casing 3, and simultaneously, due to seepage of water, soil contacting the bottom of the first casing 3 is loosened, and effective stress of the soil at the bottom is reduced, so that the first casing 3 continuously sinks, and when the upper end of the first casing 3 is about to be pulled out of the guide anchor 1, the mud pump is turned off, and the first casing 3 stops sinking;
S5 referring to fig. 9 and 10, selecting a casing 3 as a next casing, lowering the next casing 3 into the guide anchor 1, screwing the next casing 3 to the first casing 3, lifting the drill rod, moving the anchor cover 2 up to the upper port of the next casing 3, sealing the next casing 3 and the first casing 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 formation one by one and connected to each other to form a well.
Referring to fig. 11 and 12, the step S6 further includes, after the casing 3 is sunk to a certain depth, if the friction between the inner and outer walls of the casing 3 and the soil is increased, making the penetration difficult, turning off the mud pump, injecting water into the second suction water pipe 25, jetting the soil by the second suction water pipe 25 into the next casing 3, and then restarting the mud pump, extracting sand and water, reducing the friction force from the soil in the casing 3 and increasing the negative pressure difference, so as to facilitate the further penetration. When the casing 3 penetrates the hydrate reservoir, the mud pump is turned off, the anchor cover is lifted out through the drill pipe, and the casing 3 is left in the stratum to form a borehole.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (8)
1. the utility model provides an utilize continuous seabed shallow layer of cased pipe of suction anchor to become straight well device fast which characterized in that: comprises a guide anchor, an anchor cover and a plurality of sleeves,
The guide anchor comprises a cylinder body, a first drill rod connecting frame and a first suction water pipe, wherein an end cover opening is formed in the upper end of the cylinder body, the lower end of the cylinder body is opened, a circular end cover in threaded connection is arranged on the end cover opening, the upper portion of the end cover is connected with the first drill rod connecting frame, the lower end of the first suction water pipe penetrates through the end cover, the first drill rod connecting frame is used for connecting a drill rod, the drill rod is lowered down to the cylinder body to be sunk into a seabed, and the first suction water pipe is used for sucking mud, sand and water in the cylinder body;
The anchor cover comprises a circular 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, the outer end of each spring is connected with a clamping tenon, the lower portion 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 to enable the anchor cover body to be capable of moving in the sleeve, and the second suction water pipe is used for sucking sand and water in the sleeve;
the anchor cover is arranged in the sleeve, the clamping tenon is matched with the ratchet teeth to enable the anchor cover body to move upwards along the inner wall of the sleeve, and any two sleeves can be in threaded connection.
2. The apparatus of claim 1 for continuously casing a shallow subsea well in a vertical well by means of a suction anchor, wherein: the anchor cover body comprises an upper cover, a middle cover and a lower cover which are all circular, the diameter of the upper cover and the diameter of the lower cover are 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 circumference periphery of the middle cover between the upper cover and the lower cover forms the accommodating groove, 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, and the clamping tenon is extruded by the ratchet to enable the spring to shrink, so that the anchor cover body can move upwards along the inner wall of the sleeve.
3. The apparatus of claim 2 for continuously casing a shallow subsea well in a vertical well by means of a suction anchor, wherein: and sealing rings are arranged on the circumferences of the upper cover and the lower cover.
4. The apparatus of claim 2 for continuously casing a shallow subsea well in a vertical well by means of a suction anchor, wherein: 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 communicated with one another.
5. the apparatus of claim 2 for continuously casing a shallow subsea well in a vertical well by means of a suction anchor, wherein: four clamping tenons are uniformly arranged outside the circumference of the middle cover.
6. The apparatus of claim 1 for continuously casing a shallow subsea well in a vertical well by means of a suction anchor, wherein: the barrel comprises an outer barrel and an inner barrel, the inner barrel is longer than the outer barrel, the upper portion of the outer barrel is connected with the upper portion of the inner barrel, an upper port of the inner barrel is an end cover port, and the end cover port is in threaded connection with the end cover.
7. the apparatus of claim 6 for continuously casing a shallow subsea well in a vertical well by means of a suction anchor, wherein: the lower portion of the first drill rod connecting frame is provided with four orthogonally distributed grippers, all the grippers are fixedly connected with the end cover, and the drill rod rotates to dismount the end cover.
8. The apparatus of claim 6 for continuously casing a shallow subsea well in a vertical well by means of a suction anchor, wherein: ribs are arranged on the outer wall of the inner barrel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920253053.2U CN209799872U (en) | 2019-02-28 | 2019-02-28 | Device for quickly forming vertical well on seabed shallow layer by utilizing continuous casing of suction anchor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920253053.2U CN209799872U (en) | 2019-02-28 | 2019-02-28 | Device for quickly forming vertical well on seabed shallow layer by utilizing continuous casing of suction anchor |
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| CN209799872U true CN209799872U (en) | 2019-12-17 |
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| CN201920253053.2U Active CN209799872U (en) | 2019-02-28 | 2019-02-28 | Device for quickly forming vertical well on seabed shallow layer by utilizing continuous casing of suction anchor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109826564A (en) * | 2019-02-28 | 2019-05-31 | 中国地质大学（武汉） | Utilize the continuous cased sea-bottom shallow rapid-result straight well device and method fastly of suction anchor |
| CN112282707A (en) * | 2020-12-18 | 2021-01-29 | 福州大学 | Sea natural gas hydrate barrel type mining device and method thereof |
-
2019
- 2019-02-28 CN CN201920253053.2U patent/CN209799872U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109826564A (en) * | 2019-02-28 | 2019-05-31 | 中国地质大学（武汉） | Utilize the continuous cased sea-bottom shallow rapid-result straight well device and method fastly of suction anchor |
| CN109826564B (en) * | 2019-02-28 | 2023-11-07 | 中国地质大学（武汉） | Seabed shallow rapid vertical well forming device and method for continuously casing by using suction anchor |
| CN112282707A (en) * | 2020-12-18 | 2021-01-29 | 福州大学 | Sea natural gas hydrate barrel type mining device and method thereof |
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