A hole-caving prevention subsea drilling and sampling apparatus suitable for unconsolidated sediments

Abstract

The application belongs to the technical field of seabed exploration, and particularly relates to a hole-caving-preventing seabed drilling and sampling device suitable for loose sediments, which comprises a suspension platform, a double-pipe isolated sampling assembly and a loading assembly. The surface of the suspension platform is uniformly provided with a group of supports. The double-pipe isolated sampling assembly comprises an outer supporting pipe and an inner sampling pipe. The top of the supporting pipe is uniformly provided with a group of guide rods. The guide rods penetrate through the suspension platform and are in sliding connection with the suspension platform. The upper end of the guide rod is fixedly connected with a stress plate. The stress plate is intermittently hammered by the loading assembly, so that the supporting pipe is inserted into the seabed sediments, and then the supporting pipe can support and enclose the surrounding sediments, thereby preventing the hole from caving in during the sampling process. Thereafter, the sediments inside the supporting pipe are collected layer by layer through the sampling pipe, so that the layered sampling operation is realized. In the operation process, the disturbance to the sediments inside the supporting pipe can be reduced to the greatest extent, so that the sediment samples in a nearly original state are obtained.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of seabed exploration, and in particular relates to a seabed drilling and sampling device capable of preventing hole collapse and suitable for loose sediments. BACKGROUND

[0002] Seabed sediments are like a natural archive of the history of the earth, and can reveal the evolution of paleoclimate, changes in paleoenvironment and major geological events over millions of years through the preservation of complete sequences, biological fossils and chemical signals. Meanwhile, the information about mineral resources contained in the seabed sediments is of strategic significance for resource exploration. Traditional seabed drilling and sampling devices are all equipped with rotary cutting equipment to drill into seabed soil, which is not suitable for soft sediments because the rotary cutting equipment is prone to disturbing the sediments during operation, which makes it impossible to collect real original samples and is not conducive to sample analysis.

[0003] A seabed sandy sediment layer undisturbed deep-scale drilling and sampling device is disclosed in a patent application CN222668180U, and the technical solution points of the device are as follows: the device comprises a flower pipe and a ship deck, and a sampling structure is arranged at the flower pipe; the sampling structure comprises a rod-shaped weight inside the flower pipe, and a guide is arranged on the outer surface of the rod-shaped weight rod and fixedly installed on the inner wall of the flower pipe by a fixing screw, and a pipe drainage hole is further arranged on the side wall of the flower pipe, and a sampling partition is installed on the inner wall of the middle end of the flower pipe. The rod-shaped weight arranged in the flower pipe moves downward to strike the sampling pipe, so as to minimize the disturbance of the sample and increase the sampling depth.

[0004] Seabed sediments are usually formed by layer-by-layer accumulation over time, and the internal composition of different layered sediments may be different, such as mineral composition, organic matter type, microfossils, biological community, etc. Therefore, in the process of exploring seabed sediments, it is best to sample layer by layer respectively to restore the real accumulation phenomenon, but the existing technology often fails to achieve the desired effect when applied to the above-mentioned needs, which is limited by the geological characteristics of loose sediments, resulting in the occurrence of hole collapse during sampling, which will hinder the implementation of layered sampling.

[0005] Therefore, the present application provides a seabed drilling and sampling device capable of preventing hole collapse and suitable for loose sediments. SUMMARY

[0006] In order to make up for the shortcomings of the prior art and solve at least one technical problem raised in the background art.

[0007] The technical solution adopted by the present application to solve its technical problems is as follows: the seabed drilling and sampling device capable of preventing hole collapse and suitable for loose sediments comprises a suspension platform, a double-tube isolation sampling assembly and a loading assembly.

[0008] The suspended platform is in a horizontal state; the surface of the suspended platform is uniformly distributed with a group of supports; the bottom of the support is fixed to the seabed;

[0009] The double-tube isolated sampling assembly is used for sampling the seabed sediments in an isolated state; the double-tube isolated sampling assembly comprises an outer supporting tube and an inner sampling tube; the top of the supporting tube is uniformly distributed with a group of guide rods; the guide rods penetrate through the suspended platform and are in sliding connection with the suspended platform; the upper end of the guide rod is fixedly connected with a force plate;

[0010] The loading assembly is used for intermittent hammering of the force plate and promoting the supporting tube into the seabed sediments.

[0011] Preferably, the loading assembly comprises a limiting cylinder fixedly connected to the upper side of the suspended platform; the force plate is located inside the limiting cylinder; a weight is in sliding connection inside the limiting cylinder; the upper end of the weight is fixedly connected with a connecting column and a steel cable in sequence.

[0012] Preferably, the bottom of the supporting tube and the sampling tube is provided with an inclined blade.

[0013] Preferably, the double-tube isolated sampling assembly further comprises a mounting plate, and the mounting plate is fixedly connected with the guide rod; a transmission rod is in sliding connection with the middle part of the mounting plate; the surface of the transmission rod is uniformly distributed with a group of tooth blocks; a gear wheel is in rotational connection with the surface of the mounting plate, and the gear wheel is driven by a motor; the gear wheel is in meshing connection with the tooth blocks on the surface of the transmission rod.

[0014] Preferably, the upper end of the sampling tube is fixedly connected with a connecting block; the connecting block and the lower end of the transmission rod are connected through threads.

[0015] Preferably, the top side of the sampling tube is uniformly distributed with a group of drainage holes.

[0016] Preferably, the inner wall of the top of the sampling tube is fixedly connected with an annular elastic pad at the position corresponding to the drainage hole; the elastic pad is upwardly inclined and there is a gap between the elastic pad and the inner wall of the sampling tube.

[0017] Preferably, the inner wall of the bottom of the sampling tube is fixedly connected with an inner mounting ring; an annular array of triangular plates is hinged on the surface of the inner mounting ring through a rotating pin and a torsional spring; the end of the triangular plate is fixedly connected with a guide block one; the inner wall of the side of the sampling tube is provided with an electromagnet at the position corresponding to the guide block one.

[0018] Preferably, the outer wall of the bottom of the sampling tube is fixedly connected with an outer mounting ring; an annular array of push pieces is hinged on the surface of the outer mounting ring through a rotating pin and a torsional spring; the end of the push piece is fixedly connected with a guide block two; the outer side of the push piece and the outer mounting ring are fixedly connected with an annular elastic cloth.

[0019] Preferably, the top of the elastic cloth is fixedly connected with an annular rubber magnet.

[0020] The beneficial effects of the present application are as follows:

[0021] 1. The present application is a kind of anti-caving hole seabed drilling sampling device suitable for loose sediments, by intermittent hammering of load assembly stress plate, it promotes the whole gradually vertical downward movement of stress plate, guide rod and support pipe, until the support pipe is completely inserted into the seabed sediments, and then the support pipe can support and protect the surrounding sediments, prevent the caving phenomenon during sampling, after that, the sediments inside the support pipe can be collected layer by layer by a smaller size sampling tube, realize the layered sampling operation, prevent the problem of collecting all levels of sediments into the same container at one time, causing the subsequent sediments to mix and distort inside the container, restore the real layered state of the sediments, and minimize the disturbance to the sediments inside the support pipe during operation to obtain the nearly original state of the sediment sample.

[0022] 2. The present application is a kind of anti-caving hole seabed drilling sampling device suitable for loose sediments, after the support pipe is sunk into the sediments inside the seabed, the sampling tube is installed at the lower end of the transmission rod, the gear is driven to rotate by the motor, the transmission rod and the sampling tube are driven to move downward and enter the inside of the support pipe by meshing, and then the sampling tube is inserted into the sediments and promotes the sediments to enter the inside of the sampling tube, then the motor is reversed and the sampling tube is lifted to the outside of the support pipe, the sampling tube is removed to obtain the sediment sample, by continuously repeating the above operation, and the height of the sampling tube is increased each time, the layered sampling and extraction of the sediments inside the support pipe can be completed.

[0023] 3. The present application is a kind of anti-caving hole seabed drilling sampling device suitable for loose sediments, the water inside the sampling tube is first discharged outward through the gap between the elastic pad and the sampling tube and the drainage hole, then when the sediments gradually enter the inside of the sampling tube and reach the elastic pad, the sediments will deform the elastic pad and make it adhere to the inner wall surface of the sampling tube, to block the multiple drainage holes, prevent the sample inside the sampling tube from leaking outward through the drainage hole during subsequent transportation, and also prevent foreign matter from entering the inside of the sampling tube to cause pollution. BRIEF DESCRIPTION OF DRAWINGS

[0024] The present application will be further described below in conjunction with the drawings.

[0025] Figure 1 is a perspective view of the present application;

[0026] Figure 2 is a structure diagram of the double tube isolation sampling assembly in the present application;

[0027] Figure 3 is a structure diagram of the sampling tube in the present application;

[0028] Figure 4 is the structural schematic diagram of the elastic cloth in the application;

[0029] Figure 5 is the structural schematic diagram of the triangular plate in the application;

[0030] Figure 6 is the state schematic diagram of the support pipe after entering the seabed sediment in the application;

[0031] Figure 7 is the sectional view of the support pipe and the sampling pipe in the application;

[0032] Figure 8 is Figure 7 the local enlarged view at A in the application;

[0033] Figure 9 is Figure 7 the local enlarged view at B in the application;

[0034] Figure 10 is Figure 9 the local enlarged view at C in the application.

[0035] In the figure: suspended platform 1, support 2, support pipe 3, sampling pipe 4, guide rod 5, force plate 6, limiting cylinder 7, weight 8, connecting column 9, steel cable 10, mounting plate 11, transmission rod 12, gear 13, motor 14, connecting block 15, drain hole 16, elastic pad 17, inner mounting ring 18, triangular plate 19, guide block one 20, electromagnet 21, outer mounting ring 22, push piece 23, guide block two 24, elastic cloth 25, rubber magnet 26. DETAILED DESCRIPTION

[0036] In order to make the technical means, creative features, purposes and effects realized by the application easy to understand, the application is further described below in combination with specific embodiments.

[0037] As Figures 1 to 10 shown, the application relates to a hole collapse prevention seabed drilling sampling device suitable for loose sediments, which comprises a suspended platform 1, a double-pipe isolation sampling assembly and a loading assembly.

[0038] The suspended platform 1 is in a horizontal state; the suspended platform 1 is uniformly provided with a group of supports 2 on the surface; and the supports 2 are fixed to the seabed at the bottom.

[0039] The double-pipe isolation sampling assembly is used for sampling the seabed sediments in an isolation state; the double-pipe isolation sampling assembly comprises an outer support pipe 3 and an inner sampling pipe 4; the support pipe 3 is uniformly provided with a group of guide rods 5 at the top; the guide rods 5 penetrate through the suspended platform 1 and are in sliding connection with the suspended platform 1; and the guide rods 5 are fixedly connected with force plates 6 at the upper ends.

[0040] The loading assembly is used for intermittently hammering the stress plate 6 and promoting the support pipe 3 to enter the seabed sediment.

[0041] The seabed sediment is usually formed by layer-by-layer accumulation over time, and the internal composition of different layered sediments may be different, such as mineral composition, organic matter type, microfossils, biological community and the like, so in the process of exploring the seabed sediment, it is best to sample layer by layer respectively to restore the real accumulation phenomenon, but the prior art is often difficult to achieve the expected effect when applied to the above demand, which is limited by the geological characteristics of loose sediment, resulting in the phenomenon of hole collapse in the sampling process, which will hinder the implementation operation of layered sampling.

[0042] In use, the suspension platform 1 and the support 2 are first fixed at a specified position of the seabed, then the loading assembly intermittently hammers the stress plate 6, promotes the stress plate 6, the guide rod 5 and the support pipe 3 to gradually move vertically downward as a whole, until the support pipe 3 is completely inserted into the seabed sediment, and then the support pipe 3 can support and enclose the surrounding sediment, preventing the phenomenon of hole collapse in the sampling process, after which the sediment inside the support pipe 3 can be collected layer by layer by the smaller size sampling pipe 4, realizing the layered sampling operation, preventing the problem of mixing the subsequent sediments in the container, restoring the real layered state of the sediment, and minimizing the disturbance to the sediment inside the support pipe 3 during the operation to obtain a sediment sample in a nearly original state.

[0043] As another embodiment of the present application, the loading assembly comprises a limiting cylinder 7 fixedly connected to the upper side of the suspension platform 1; the stress plate 6 is located inside the limiting cylinder 7; a heavy hammer 8 is slidably connected inside the limiting cylinder 7; and a connecting column 9 and a steel cable 10 are fixedly connected in sequence to the upper end of the heavy hammer 8.

[0044] The steel cable 10 is intermittently pulled or released by the ship-mounted winch, promoting the heavy hammer 8 to reciprocate inside the limiting cylinder 7 and hit the stress plate 6, so as to continuously hammer the support pipe 3 into the sediment, which has less interference to the water flow and the sediment, can prevent damage to the local topography of the seabed, improve the sampling authenticity, and the specific working principle of the loading assembly can refer to CN222668180U-A seabed sandy sediment layer undisturbed deep scale drilling and sampling device, which will not be described here.

[0045] As another embodiment of the present application, the support pipe 3 and the sampling pipe 4 are both provided with inclined blade edges at the bottom, which facilitates the downward cutting of the support pipe 3 or the sampling pipe 4 into the sediment, reduces the frictional resistance, and reduces the difficulty of drilling and sampling.

[0046] As another embodiment of the present application, the double-tube isolation sampling assembly further comprises a mounting plate 11, and the mounting plate 11 is fixedly connected with the guide rod 5, and the mounting plate 11 is located below the suspended platform 1; a transmission rod 12 is slidably connected in the middle of the mounting plate 11; a plurality of tooth blocks are uniformly distributed on the surface of the transmission rod 12; a gear 13 is rotatably connected to the surface of the mounting plate 11, and the gear 13 is driven by a motor 14; the gear 13 is in meshing connection with the tooth blocks on the surface of the transmission rod 12.

[0047] A connecting block 15 is fixedly connected to the upper end of the sampling tube 4; the connecting block 15 is in threaded connection with the lower end of the transmission rod 12.

[0048] After the support tube 3 sinks into the sediment inside the seabed, the sampling tube 4 is installed at the lower end of the transmission rod 12, the gear 13 is driven to rotate by the motor 14, the transmission rod 12 and the sampling tube 4 are driven to move downward and enter the inside of the support tube 3 by the meshing effect, and then the sampling tube 4 is inserted into the sediment and promotes the sediment to enter the inside of the sampling tube 4, and then the motor 14 is reversed and controls the sampling tube 4 to rise to the outside of the support tube 3, the sampling tube 4 is removed, and the sediment sample is obtained, by continuously repeating the above operation, and the height of the sampling tube 4 is increased each time, the stratified sampling and extraction of the sediment inside the support tube 3 can be completed.

[0049] It is worth noting that when the support tube 3 sinks under the action of hammering, the connection between the sediment inside and outside the support tube 3 can be cut off, the stress state of the sediment is improved, and therefore the sampling difficulty of the sediment inside the support tube 3 is lower, and the hammering method is not needed, only the driving method of the motor 14 is needed, which is more easily controlled and can improve the work efficiency.

[0050] As another embodiment of the present application, a plurality of drainage holes 16 are uniformly distributed on the top side of the sampling tube 4. In the process that the sediment enters the sampling tube 4 from the bottom of the sampling tube 4, the water inside the sampling tube 4 can be discharged outward through the drainage holes 16, the internal pressure of the sampling tube 4 is reduced, the distortion of the sediment sample under pressure is prevented, and the storage capacity is increased.

[0051] An annular elastic pad 17 is fixedly connected to the inner wall of the top of the sampling tube 4 at the position corresponding to the drainage hole 16; the elastic pad 17 is upwardly inclined and there is a gap between the elastic pad 17 and the inner wall of the sampling tube 4.

[0052] The water inside the sampling tube 4 is first discharged outward through the gap between the elastic pad 17 and the sampling tube 4 and the drainage hole 16, and then when the sediment gradually enters the inside of the sampling tube 4 and reaches the elastic pad 17, the sediment deforms the elastic pad 17 and makes it fit the surface of the inner wall of the sampling tube 4, so as to block the plurality of drainage holes 16, prevent the sample inside the sampling tube 4 from leaking outward through the drainage holes 16 in the subsequent transfer process, and also prevent foreign matters from entering the inside of the sampling tube 4 to cause pollution.

[0053] As another embodiment of the present application, the inner wall of the bottom of the sampling tube 4 is fixedly connected with an inner mounting ring 18; the surface of the inner mounting ring 18 is hingedly connected with a group of annular arrayed triangular plates 19 through a rotating pin and a torsional spring; the end of the triangular plate 19 is fixedly connected with a guide block one 20; the inner wall of the side wall of the sampling tube 4 is provided with an electromagnet 21 at the corresponding position of the guide block one 20.

[0054] The outer wall of the bottom of the sampling tube 4 is fixedly connected with an outer mounting ring 22; the surface of the outer mounting ring 22 is hingedly connected with a group of annular arrayed push pieces 23 through a rotating pin and a torsional spring, the number of the push pieces 23 is same as that of the triangular plates 19; the end of the push piece 23 is fixedly connected with a guide block two 24; the outer side of the push piece 23 and the outer mounting ring 22 are fixedly connected with an annular elastic cloth 25.

[0055] Normally, the electromagnet 21 is in an energized state, which can keep the guide block one 20 and the guide block two 24 attracted, so as to fix the triangular plate 19 and the push piece 23 at a vertical position, at this time, the torsional spring at the hinge of the triangular plate 19 and the push piece 23 is in an energy storage state; when the deposit completely enters the inside of the sampling tube 4, the electromagnet 21 is de-energized, the guide block one 20 and the guide block two 24 lose the attractive force at the same time, on the one hand, the torsional spring drives the triangular plate 19 to deflect inward and reset to a horizontal position, a plurality of triangular plates 19 are spliced into a complete circular cross section to seal and preserve the bottom of the sampling tube 4, preventing the deposit inside the sampling tube 4 from falling downward during the lifting of the sampling tube 4, on the other hand, the torsional spring drives the push piece 23 to deflect outward and reset, then a plurality of push pieces 23 extrude the annular elastic cloth 25 to deform and expand outward until the elastic cloth 25 is inclined and pressed against the inner wall surface of the support tube 3, then the deposit between the sampling tube 4 and the support tube 3 is taken out upward by the push piece 23 and the elastic cloth 25 during the lifting of the sampling tube 4, since the excess deposit is at the same height and has the same composition as the deposit of the current sampling level, if it is kept inside the support tube 3, the deposit is easy to collapse in the middle after the sampling tube 4 is lifted, and the deposit is easy to be collected into the sampling tube 4 together with the deposit of the next level during the next sampling, the above problem can be avoided by taking out the excess deposit between the sampling tube 4 and the support tube 3 outward through the push piece 23 and the expanded elastic cloth 25, further improving the sampling accuracy of the deposit of different levels.

[0056] As another embodiment of the present application, the top of the elastic cloth 25 is fixedly connected with an annular rubber magnet 26. When the elastic cloth 25 approaches the side wall of the support tube 3, the magnetic attraction between the rubber magnet 26 and the support tube 3 can improve the fitting degree of the elastic cloth 25 and the support tube 3, so as to reduce the downward leakage of the deposit above the elastic cloth 25, and completely remove the deposit between the sampling tube 4 and the support tube 3 as much as possible.

[0057] The above-mentioned front, back, left, right, up, down are all based on the directions in the drawings Figure 1 Take the human observation angle as the standard, the side of the device facing the observer is defined as front, the left side of the observer is defined as left, and the like.

[0058] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application.

[0059] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A hole stabilizing subsea drilling and sampling apparatus suitable for use with unconsolidated sediments, characterized by: The invention relates to a kind of marine sediment sampling device, including suspension platform (1), double-tube isolated sampling assembly and loading assembly; The suspension platform (1) is in horizontal state, and a group of supports (2) are uniformly distributed on the surface of the suspension platform (1), and the bottom of the support (2) is fixed to the seabed; The double-tube isolated sampling assembly is used for sampling the seabed sediments in the isolated state, and includes an outer supporting tube (3) and an inner sampling tube (4), a group of guide rods (5) are uniformly distributed on the top of the supporting tube (3), the guide rods (5) penetrate through the suspension platform (1) and are slidably connected therewith, and a force plate (6) is fixedly connected to the upper end of the guide rod (5); The loading assembly is used for intermittent hammering the force plate (6) and making the supporting tube (3) enter the seabed sediments. An inner mounting ring (18) is fixedly connected to the inner wall of the bottom of the sampling tube (4), a group of annularly arranged triangular plates (19) are hingedly connected to the surface of the inner mounting ring (18) through a rotating pin and a torsional spring, a guide block one (20) is fixedly connected to the end of the triangular plate (19), and an electromagnet (21) is arranged in the inner wall of the side of the sampling tube (4) at the corresponding position of the guide block one (20). An outer mounting ring (22) is fixedly connected to the outer wall of the bottom of the sampling tube (4), a group of annularly arranged push pieces (23) are hingedly connected to the surface of the outer mounting ring (22) through a rotating pin and a torsional spring, a guide block two (24) is fixedly connected to the end of the push piece (23), and an annular elastic cloth (25) is fixedly connected between the outer side of the push piece (23) and the outer mounting ring (22).

2. A sub-sea borehole drilling and sampling apparatus for use in unconsolidated sediments according to claim 1, wherein: The loading assembly includes a limiting cylinder (7) fixedly connected to the upper side of the suspension platform (1), the force plate (6) is located in the limiting cylinder (7), a weight (8) is slidably connected in the limiting cylinder (7), and a connecting column (9) and a steel cable (10) are sequentially fixedly connected to the upper end of the weight (8).

3. A sub-sea borehole drilling and sampling apparatus for use in unconsolidated sediments according to claim 1, wherein: The bottom of the supporting tube (3) and the bottom of the sampling tube (4) are provided with inclined blade edges.

4. A sub-sea borehole drilling and sampling apparatus for use in unconsolidated sediments according to claim 1, wherein: The double-tube isolated sampling assembly further includes a mounting plate (11) fixedly connected with the guide rod (5), a transmission rod (12) is slidably connected to the middle of the mounting plate (11), a group of tooth blocks are uniformly distributed on the surface of the transmission rod (12), a gear (13) is rotatably connected to the surface of the mounting plate (11) and is driven by a motor (14), and the gear (13) is in meshing connection with the tooth blocks on the surface of the transmission rod (12).

5. A sub-sea borehole drilling and sampling apparatus for use in unconsolidated sediments according to claim 4 wherein: A connecting block (15) is fixedly connected to the upper end of the sampling tube (4), and the connecting block (15) and the lower end of the transmission rod (12) are connected through threads.

6. A sub-sea borehole drilling and sampling apparatus for use in unconsolidated sediments according to claim 1, wherein: A group of drainage holes (16) are uniformly distributed on the side of the top of the sampling tube (4).

7. A sub-sea borehole drilling and sampling apparatus for use in unconsolidated sediments according to claim 6 wherein: An annular elastic pad (17) is fixedly connected to the inner wall of the top of the sampling tube (4) at the corresponding position of the drainage hole (16), the elastic pad (17) is upwardly inclined and has a gap with the inner wall of the sampling tube (4).

8. A sub-sea borehole drilling and sampling apparatus for use in unconsolidated sediments according to claim 1, wherein: An annular rubber magnet (26) is fixedly connected to the top of the elastic cloth (25).

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