Turbine driving type sampler

Abstract

The utility model relates to the technical field of drilling pressure-maintaining sampling devices for seabed shallow rock samples, in particular to a turbine drive type sampler which comprises an outer pipe and an upper connector fixedly connected with a top opening of the outer pipe, and the upper connector is used for being externally connected with a pipeline of offshore equipment. A driving turbine is installed in the outer pipe, a drainage valve is arranged at the position, located below the driving turbine, of the outer pipe, a flowing medium, such as water flowing through the driving turbine, entering the upper connector from a pipeline is drained out of the drainage valve, a pressure maintaining cylinder is rotationally arranged in an inner cavity of the lower middle portion of the outer pipe, and the top of the pressure maintaining cylinder is fixedly connected with a wheel shaft of the driving turbine. The driving turbine drives the pressure maintaining cylinder to rotate, meanwhile, the pressure maintaining cylinder is filled with nitrogen with set pressure, an advanced drill bit is fixed to a bottom opening of the pressure maintaining cylinder, and the advanced drill bit extends out of the bottom opening of the outer pipe and is used for drilling and sampling the seabed; a sampling device is arranged in the pressure maintaining cylinder, the sampling device is used for carrying out closed storage on rock samples drilled by the advanced drill bit, and the pressure maintaining cylinder is used for carrying out pressure maintaining storage.

Description

Technical Field

[0001] The utility model relates to the technical field of a drilling pressure - maintaining sampling device for shallow - layer rock samples on the seabed, and specifically refers to a turbine - driven sampler. Background Technique

[0002] The corer for shallow - layer rock samples on the seabed is an instrument used for marine scientific research, which can collect sediment samples within the range from the seabed surface to several hundred meters underwater. It is an important tool in the fields of petroleum geology, natural gas exploration, marine geology, etc.

[0003] With the continuous progress and development of modern technology, the issue of how to efficiently and sustainably exploit marine resources has become a major hot topic discussed by countries around the world. The ocean contains rich mineral resources and biological resources, such as oil, natural gas, submarine metal minerals, etc. Among them, natural gas hydrate is an important energy source for future development. Due to its special physical properties, natural gas hydrate tends to dissociate into gas at a relatively fast rate under non - pressure conditions, and more than 95% of hydrocarbons are lost during recovery under non - pressure - maintaining conditions, which is a common situation in the drilling and production process and seriously affects the accurate quantification of the global natural gas hydrate reserves.

[0004] When using conventional coring techniques, it will cause the decomposition of natural gas hydrate. Therefore, to solve the above problems and meet the needs of marine drilling in China, it is necessary to develop a new type of corer for shallow - layer rock samples on the seabed. Content of the Utility Model

[0005] The utility model aims to solve at least the problem of setting pressure - maintaining conditions in the sampling process of natural gas hydrate in the prior art.

[0006] This solution provides a turbine - driven sampler, which is achieved by the following specific technical means: it includes an outer pipe and an upper joint fixedly connected to the top opening of the outer pipe. The upper joint is used to externally connect the pipeline of offshore equipment. A driving turbine is installed in the outer pipe, and a drain valve is arranged below the driving turbine on the outer pipe.

[0007] A pressure - maintaining cylinder rotates in the inner cavity of the middle and lower part of the outer pipe. The top of the pressure - maintaining cylinder is fixedly connected to the wheel shaft of the driving turbine. The driving turbine drives the pressure - maintaining cylinder to rotate. At the same time, nitrogen with a set pressure is filled in the pressure - maintaining cylinder. A leading drill bit is fixed at the bottom opening of the pressure - maintaining cylinder. A sampling device is also arranged in the pressure - maintaining cylinder, and the sampling device stores the rock samples drilled by the leading drill bit under pressure - maintaining conditions.

[0008] Preferred Technical Solution 1: A piston - type accumulator is arranged on the sampling device.

[0009] Preferred Technical Solution 2: The axle of the driving turbine is a hollow cavity structure with upper and lower openings. The fishing spear located inside the upper sub is passed through the hollow cavity by a fixedly connected connecting rod and then enters the pressure maintaining cylinder to be connected to the sampling device. By lifting the fishing spear, the position of the sampling device in the pressure maintaining cylinder can be controlled.

[0010] Preferred Technical Solution 3: The sampling device includes a sampling cylinder that slides up and down in the pressure maintaining cylinder. The bottom opening of the sampling cylinder faces the pilot bit directly, and a claw spring is fixed at the bottom opening of the sampling cylinder. The drilled rock sample enters the sampling cylinder along the claw spring. The sampling cylinder is connected to a piston accumulator.

[0011] Preferred Technical Solution 4: A decoupling mechanism is connected between the bottom end of the connecting rod extending into the pressure maintaining cylinder and the top end of the sampling cylinder. The decoupling mechanism is intermittently hooked and connected by a clamp type top hook fixedly connected to the bottom end of the connecting rod and a hook protrusion fixedly connected to the top end of the sampling cylinder. A flap valve is arranged on the inner wall of the pressure maintaining cylinder. When the bottom opening of the sampling cylinder is in butt contact with the top opening of the pilot bit, the flap valve turns down and lies flat to block between the bottom opening of the sampling cylinder and the top opening of the pilot bit.

[0012] Preferred Technical Solution 5: A temperature and pressure recorder is arranged inside the sampling cylinder, and the temperature and pressure recorder is used to record the pressure and temperature data in the sampling cylinder.

[0013] Preferred Technical Solution 6: A pressure measuring joint is also connected between the connecting rod and the clamp type top hook in the pressure maintaining cylinder, and the pressure measuring joint is used to detect the pressure data in the pressure maintaining cylinder.

[0014] Preferred Technical Solution 7: The flap valve is hinged to the inner wall of the pressure maintaining cylinder, and a torsion spring is also connected between the two.

[0015] Adopting the above structure makes this solution have the following beneficial effects:

[0016] 1. Adopting turbine drive, with an internal piston accumulator and a decoupling plate valve for heat preservation and pressure maintenance sampling, effectively avoiding the dissociation of natural gas hydrates in the sample;

[0017] 2. Utilizing the energy storage function of the piston accumulator can not only adjust the pressure in the pressure maintaining cylinder, but also absorb and store the pressure change in the sampling cylinder. Description of the Drawings

[0018] The drawings are used to provide a further understanding of the present utility model and constitute a part of the specification. They are used together with the embodiments of the present utility model to explain the present utility model and do not constitute a limitation to the present utility model. In the drawings:

[0019] Figure 1 It is a schematic diagram of the overall structure of this solution;

[0020] Figure 2 This is the upward state diagram of the sampling cylinder in this solution;

[0021] Figure 3 Separation state diagram of the decoupling mechanism in this solution

[0022] Among them, 1. Upper joint, 2. Fishing spear, 3. Upper bullet clip, 4. Driving turbine, 5. Outer tube, 6. Turbine joint, 7. Centralizer, 8. Pressure measuring joint, 9. Temperature and pressure recorder, 10. Flap valve, 11. Torsion spring, 12. Sampling cylinder, 13. Claw spring, 14. Pilot bit, 15. Piston accumulator, 16. Decoupling mechanism, 17. Pressure holding cylinder, 18. Lower bullet clip, 19. Drain valve. Specific implementation mode

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments; based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present utility model.

[0024] Please refer to Figure 1 , the turbine-driven sampler includes an outer tube 5 and an upper joint 1 fixedly connected to the top opening of the outer tube 5. The upper joint 1 is used to externally connect the pipeline of offshore equipment. A driving turbine 4 is installed in the outer tube 5. The upper joint 1 is threadedly connected to the outer tube 5. The driving turbine 4 is fixed in the top opening of the outer tube 5. A drain valve 19 is fixedly arranged below the driving turbine 4 on the outer tube 5. The flowing medium entering the upper joint 1 from the pipeline, such as water, flows through the driving turbine 4 and then is discharged from the drain valve 19. During the flowing process, the driving turbine 4 is driven to rotate by the medium; a pressure holding cylinder 17 is rotated in the middle and lower inner cavity of the outer tube 5. The top of the pressure holding cylinder 17 is fixedly connected to the axle of the driving turbine 4. The pressure holding cylinder 17 is driven to rotate by the driving turbine 4. At the same time, nitrogen with a set pressure is filled in the pressure holding cylinder 17. A pilot bit 14 is fixed at the bottom opening of the pressure holding cylinder 17. The pilot bit 14 extends out of the bottom opening of the outer tube 5 for drilling and sampling the seabed; a sampling device is also arranged in the pressure holding cylinder 17. The sampling device seals and stores the rock samples drilled by the pilot bit 14 and uses the pressure holding cylinder 17 for pressure holding storage.

[0025] Please refer to Figure 1 , for the turbine-driven sampler, the axle of the driving turbine 4 is a hollow cavity structure with upper and lower openings. The fishing spear 2 located in the upper joint 1 slides out of the middle cavity through the fixedly connected connecting rod and then enters the pressure holding cylinder 17 to be connected to the sampling device. By lifting the fishing spear 2, the position of the sampling device in the pressure holding cylinder 17 can be controlled. The fishing spear 2 is connected to the rope in the pipeline;

[0026] The sampling device includes a sampling cylinder 12 that slides up and down in a pressure-holding cylinder 17. The bottom opening of the sampling cylinder 12 faces the pilot bit 14 directly, and a claw spring 13 (using existing technology) is fixed at the bottom opening of the sampling cylinder 12. In the initial state, the bottom opening of the sampling cylinder 12 is close to the top opening of the pilot bit 14. As the rotation progresses, the drilled rock sample enters the sampling cylinder 12 along the claw spring 13. After sampling is completed, the claw spring 13 closes under the gravity of the sample. A piston-type accumulator 15 is provided on the sampling cylinder 12. Nitrogen is pre-charged in the piston-type accumulator 15. The pre-charged nitrogen in the piston-type accumulator 15 compensates for the pressure loss in the pressure-holding cylinder 17 to maintain a constant pressure in the cylinder. The piston in the piston-type accumulator 15 slides in the upper part of the inner cavity of the sampling cylinder 12. At the same time, the discharge end of the piston-type accumulator 15 is located outside the sampling cylinder 12. Nitrogen at a corresponding pressure is injected above the piston before lowering into the well. When the sample enters the sampling cylinder 12, the pressure in the sampling cylinder 12 changes and squeezes the piston to move, thereby enabling the piston-type accumulator 15 to convert the pressure at the sampling location into compressed energy and store it. When there is a pressure leak in the pressure-holding cylinder 17 during the sampling process, the piston-type accumulator 15 automatically releases the stored energy to supplement the pressure loss in the pressure-holding cylinder 17.

[0027] Please refer to Figures 1-3 , a turbine-driven sampler. The connecting rod extends into the bottom end of the pressure-holding cylinder 17 and is connected to the top end of the sampling cylinder 12 through a decoupling mechanism 16 (using existing technology). The decoupling mechanism 16 is composed of a pliers-type top hook fixedly connected to the bottom end of the connecting rod and a hook protrusion fixedly connected to the top end of the sampling cylinder 12, which are intermittently hooked and connected. A turbine joint 6 is fixed at the lower part of the driving turbine 4 in the outer tube 5. The turbine joint 6 is located below the drain valve 19. The axle of the driving turbine 4 rotates through the turbine joint 6. At the same time, a lower spring clip 18 is fixed to the bottom side of the turbine joint 6. The lower spring clip 18 is used to touch and squeeze the pliers-type top hook when the connecting rod is lifted to drive the pliers-type top hook to move up, opening the bottom opening of the pliers-type top hook and separating the pliers-type top hook from the hook protrusion;

[0028] A flap valve 10 is provided on the inner wall of the pressure-holding cylinder 17. The flap valve 10 is hinged to the inner wall of the pressure-holding cylinder 17, and a torsion spring 11 is also connected between the two. When the bottom opening of the sampling cylinder 12 is in butt contact with the top opening of the pilot bit 14, the flap valve 10 is in a vertical position and is placed against the outer wall of the sampling cylinder 12. When the connecting rod is lifted to drive the sampling cylinder 12 to move up, the bottom opening of the sampling cylinder 12 moves above the flap valve 10. At this time, the flap valve 10 flips down and lies flat to block between the bottom opening of the sampling cylinder 12 and the top opening of the pilot bit 14. After the pliers-type top hook is separated from the hook protrusion, the sampling cylinder 12 falls onto the flap valve 10 under its own weight, so that during the overall removal process of the outer tube 5, the sampling cylinder 12 can be enclosed in the pressure-holding cylinder 17.

[0029] Please refer to Figure 1 , a turbine-driven sampler, in which a temperature and pressure recorder 9 is arranged in the sampling cylinder 12, and the temperature and pressure recorder 9 is used to record the pressure and temperature data in the sampling cylinder 12.

[0030] Please refer to Figure 1 , a turbine-driven sampler, in which a pressure measuring joint 8 is further connected between the connecting rod and the clamp-type top hook in the pressure maintaining cylinder 17, and the pressure measuring joint 8 is used to detect the pressure data in the pressure maintaining cylinder 17.

[0031] Please refer to Figure 1 , a turbine-driven sampler, in which an upper spring clip 3 is further fixed in the outer tube 5. The upper spring clip 3 is located above the driving turbine 4 and below the fishing spearhead 2 at the same time. The upper spring clip 3 is used to fix the position of the driving turbine 4 to prevent it from moving up and down. The connecting rod passes through the hole at the center of the upper spring clip 3, and the diameter of the hole here is larger than the diameter of the connecting rod to facilitate the entry of the medium. There are holes in the upper spring clip 3 through which the fluid can pass. The fluid flows through the upper spring clip 3 into the turbine, driving the turbine blades to rotate, and thus the axle rotates.

[0032] Please refer to Figure 1 , a turbine-driven sampler, in which a centralizer 7 is externally connected to the middle part of the outer tube 5, and the centralizer 7 is used to straighten the outer tube 5.

[0033] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A turbine-driven sampler, comprising an outer tube (5) and an upper joint (1) fixedly connected to the top opening of the outer tube (5), characterized in that: A driving turbine (4) is installed in the outer tube (5), and a drain valve (19) is provided below the driving turbine (4) on the outer tube (5); A pressure-holding cylinder (17) rotates in the inner cavity of the middle and lower part of the outer tube (5). The top of the pressure-holding cylinder (17) is fixedly connected to the axle of the driving turbine (4). At the same time, nitrogen gas is filled in the pressure-holding cylinder (17). A leading drill bit (14) is fixed at the bottom opening of the pressure-holding cylinder (17), and the leading drill bit (14) extends out from the bottom opening of the outer tube (5); A sampling device is arranged in the pressure-holding cylinder (17). The sampling device hermetically stores the rock sample drilled by the leading drill bit (14) and uses the pressure-holding cylinder (17) to maintain pressure.

2. The turbine-driven sampler according to claim 1, characterized in that: A piston accumulator (15) is arranged on the sampling device. Nitrogen gas is pre-charged in the piston accumulator (15). The pre-charged nitrogen gas in the piston accumulator (15) compensates for the pressure loss in the pressure-holding cylinder (17) to maintain a constant pressure in the pressure-holding cylinder (17).

3. The turbine-driven sampler according to claim 2, wherein: The axle of the driving turbine (4) is a hollow cavity structure with upper and lower openings. The fishing spearhead (2) located in the upper joint (1) passes through the middle cavity through a fixedly connected connecting rod and then enters the pressure-holding cylinder (17) to be connected to the sampling device.

4. The turbine-driven sampler according to claim 3, characterized in that: The sampling device includes a sampling cylinder (12) that slides up and down in the pressure-holding cylinder (17). The bottom opening of the sampling cylinder (12) faces the leading drill bit (14), and a claw spring (13) is fixed at the bottom opening of the sampling cylinder (12). The piston on the piston accumulator (15) slides in the upper part of the inner cavity of the sampling cylinder (12), and at the same time, the discharge end of the piston accumulator (15) is located outside the sampling cylinder (12).

5. A turbine-driven sampler according to claim 4, characterized in that: The connecting rod extends into the bottom end of the pressure-holding cylinder (17) and is connected to the top end of the sampling cylinder (12) through a decoupling mechanism (16). The decoupling mechanism (16) is intermittently hooked and connected by a clamp-type top hook fixedly connected to the bottom end of the connecting rod and a hook protrusion fixedly connected to the top end of the sampling cylinder (12).

6. The turbine-driven sampler according to claim 5, wherein: A turbine joint (6) is fixed in the outer tube (5) below the driving turbine (4). The axle of the driving turbine (4) rotates through the turbine joint (6). At the same time, a lower spring clip (18) is fixed on the bottom side of the turbine joint (6). The lower spring clip (18) is used to touch and squeeze the clamp-type top hook when the connecting rod is lifted to drive the clamp-type top hook to move up, and open the bottom opening of the clamp-type top hook.

7. A turbine-driven sampler according to claim 5, characterized in that: A flap valve (10) is arranged on the inner wall of the pressure-holding cylinder (17). The flap valve (10) is hinged to the inner wall of the pressure-holding cylinder (17), and a torsion spring (11) is also connected between the two. When the bottom opening of the sampling cylinder (12) is in butt contact with the top opening of the leading drill bit (14), the flap valve (10) is in a vertical state and is placed against the outer wall of the sampling cylinder (12). When the connecting rod is lifted to drive the sampling cylinder (12) to move up, when the bottom opening of the sampling cylinder (12) moves above the flap valve (10), the flap valve (10) turns down and lies flat to block between the bottom opening of the sampling cylinder (12) and the top opening of the leading drill bit (14).

8. A turbine-driven sampler according to claim 4, wherein: A temperature and pressure recorder (9) is arranged inside the sampling cylinder (12).

9. A turbine-driven sampler according to claim 5, characterized in that: A pressure measuring joint (8) is further connected between the connecting rod and the pliers-type top hook in the pressure maintaining cylinder (17).

10. The turbine-driven sampler according to claim 3, wherein: An upper spring clip (3) is further fixed inside the outer tube (5). The upper spring clip (3) is located above the driving turbine (4) and below the fishing spearhead (2) at the same time. The connecting rod passes through the hole at the center of the upper spring clip (3).

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