Oscillating gel breaking and separating device for ocean hydrate cementation particles

Abstract

The invention discloses a marine hydrate cementation particle oscillation gel breaking separation device which comprises a lower outer layer pipe and an inner layer pipe assembly located in the lower outer layer pipe, the inner layer pipe assembly comprises a gel breaking sleeve, an oscillation element is arranged in the gel breaking sleeve, and a spiral flow channel is formed in the outer wall of the oscillation element; the push shaft is connected with the oscillating element, and the oscillating mechanism is used for driving the push shaft to do reciprocating motion in the axial direction of the lower outer-layer pipe. The invention provides a marine hydrate cementitious particle oscillation gel breaking separation device to solve the problems that in the prior art, the gel breaking force is small, and the gel breaking separation effect on cementitious particles is limited, and the purposes that the gel breaking efficiency of the cementitious particles is improved, and then the recovery efficiency of hydrates is improved are achieved.

Description

Technical Field

[0001] The invention relates to the field of hydrate exploitation, and in particular to an oscillating gel-breaking and separation device for marine hydrate cemented particles. Background Art

[0002] Natural gas hydrate is an ice-like crystalline substance formed by natural gas and water under high pressure and low temperature conditions. Because it looks like ice and burns when exposed to fire, it is also called "combustible ice". Natural gas hydrate is distributed in deep sea or terrestrial permafrost. After burning, it only produces a small amount of carbon dioxide and water. The pollution is far less than coal, oil, etc., and the reserves are huge. Natural gas hydrate is generally found in the surface sedimentary layer of the seabed at a depth of no more than 2,000 meters.

[0003] Some non-diagenetic natural gas hydrates have reservoir characteristics such as weak cementation, poor stability, and no dense caprock. Based on this, a new method of solid fluidized mining has been proposed in the prior art and successfully tested. The core idea of ​​the solid fluidized mining method is to use water jets to break up the hydrate reservoir and fluidize it into slurry without changing the temperature and pressure conditions, and then recover the hydrate to the platform through recovery, separation and lifting. Due to the cementing properties of hydrate sediments, the hydrate slurry obtained after jet crushing contains a large number of cementing particles. The mutual cementation between hydrates and sand particles will cause a large number of hydrate particles to be carried in the sand backfilled to the bottom of the well, and cause a large number of sand particles to be entrained in the recovered hydrate slurry, which greatly reduces the recovery efficiency of hydrates.

[0004] In the prior art: Chinese patent with publication number CN109882147A discloses "a large-capacity integrated downhole hydrate in-situ separation parallel device", which connects traditional separators in parallel, improves the working capacity of the separators, and optimizes the separator parallel mode; however, this technology is mainly aimed at the centrifugal separation of mud and sand, and its target is the dispersed hydrate and sand particles, and the debonding ability is weak when the two are mutually bonded. Chinese patent with publication number CN113090244A discloses "a natural gas hydrate cyclone self-rotation debonding separation method and separation device", which is composed of a preliminary debonder, a cyclone debonding cylinder and a cyclone separation cylinder. The separation device realizes the debonding and separation of natural gas hydrate sediment slurry, but this device will cause the wellbore diameter to increase, resulting in an increase in the diameter of the drilling wellbore, reducing the reservoir stability and increasing the risk of wellbore reservoir collapse. A Chinese patent with publication number CN113153235A discloses "a natural gas hydrate downhole hydraulic crushing recovery and separation device", which uses the strong shearing effect of the cyclone field to break and separate weakly bonded natural gas hydrates. Its technical principle is still passive, using the centrifugal effect of spiral motion to break the gel, and the breaking effect is still weak.

[0005] In summary, the debonding force generated by the existing hydrate recovery technologies is relatively small, and the debonding and separation effect on the cementing particles in the hydrate slurry is limited, resulting in low hydrate recovery efficiency. Summary of the invention

[0006] The present invention provides an oscillating degumming and separation device for marine hydrate cementing particles, so as to solve the problems of small degumming force and limited degumming and separation effect on cementing particles in the prior art, so as to improve the degumming efficiency of cementing particles and further improve the hydrate recovery efficiency.

[0007] The present invention is achieved through the following technical solutions:

[0008] A marine hydrate cementation particle oscillation debonding and separation device comprises a lower outer layer tube, an inner layer tube assembly located inside the lower outer layer tube, the inner layer tube assembly comprises a debonding sleeve, an oscillating element is arranged inside the debonding sleeve, and a spiral flow channel is arranged on the outer wall of the oscillating element; it also comprises a driving shaft connected to the oscillating element, and an oscillating mechanism for driving the driving shaft to reciprocate along the axial direction of the lower outer layer tube.

[0009] In view of the problems that the prior art has low degumming force and limited degumming and separation effect on cemented particles in the process of hydrate exploitation, the present invention proposes an oscillating degumming and separation device for marine hydrate cemented particles. Based on the double-layer tube technology in hydrate exploitation, this scheme has structures such as a lower outer tube and an inner tube assembly. The inner tube assembly of the present application includes a degumming sleeve, and an oscillating element is arranged inside the sleeve. The spiral flow channel on the outer wall of the oscillating element is used for returning the hydrate slurry, and the oscillation mechanism drives the driving shaft to perform axial reciprocating motion, thereby making the oscillating element connected to the driving shaft perform axial reciprocating motion synchronously.

[0010] When the present application is in operation, it is connected above the downhole power drill. The high-pressure fluid flows downward from the annulus between the lower outer tube and the inner tube assembly into the downhole power drill, driving the downhole power drill to rotate and synchronously performing jet crushing. The obtained hydrate slurry returns to the existing inner tube and enters the inner tube assembly in the present application. When the hydrate slurry passes through the oscillating element, it enters the spiral flow channel, generates centrifugal force, and separates the sand particles bonded with the hydrate particles. At the same time, since the oscillating element in the present application is constantly performing axial reciprocating motion, it can synchronously oscillate and crush the hydrate slurry under the action of centrifugal force, thereby significantly optimizing the debonding effect on the bonded hydrate particles and sand particles, improving the debonding efficiency of the bonded particles, and improving the recovery rate of natural gas hydrates.

[0011] Furthermore, the inner layer pipe assembly also includes a push sleeve connected below the rubber breaking sleeve, and a middle inner layer pipe connected below the push sleeve;

[0012] The top end of the driving shaft is connected to the bottom of the oscillating element, and the bottom end is located in the middle inner layer tube;

[0013] The oscillation mechanism includes a piston head located in the middle inner tube, an elastic member located in the middle inner tube and contacting the piston head and the driving shaft at both ends, and an excitation component for generating pressure fluctuations inside the middle inner tube and in the space below the piston head.

[0014] In this solution, the top of the driving shaft is located in the middle inner tube, and the top is connected to the bottom of the oscillating element. Inevitably, the inside of the middle inner tube is connected to the spiral flow channel. When the oscillating mechanism is working, the excitation component generates pressure fluctuations in the internal space of the middle inner tube below the piston head: when the pressure increases, the piston head is driven to move upward, and the driving shaft is driven upward by the piston head, thereby driving the oscillating element upward, and the elastic part is compressed synchronously during the upward movement of the piston head; when the pressure drops, the piston head moves downward under the elastic reset force of the elastic part, and the driving shaft is driven downward by the piston head, thereby driving the oscillating element downward; this reciprocating process can realize the axial reciprocating motion of the driving shaft through pressure fluctuations.

[0015] The excitation component in this solution can be implemented using any existing technology that can provide pressure fluctuations or pressure pulses, and is not specifically limited here.

[0016] Furthermore, a plurality of outflow holes are provided on the side wall of the driving shaft, and the outflow holes are connected to the spiral flow channel. This solution enables the hydrate slurry returning to the interior of the driving shaft to be discharged from the outflow holes and enter the spiral flow channel above.

[0017] Furthermore, the inner tube assembly also includes a static valve shaft connected to the bottom of the middle inner tube; the excitation assembly includes a dynamic valve shaft rotatably fitted in the static valve shaft, and a driving mechanism for driving the dynamic valve shaft to rotate, and the outer wall of the dynamic valve shaft is partially in contact with the inner wall of the static valve shaft; a number of annularly distributed dynamic valve holes are opened on the dynamic valve shaft in the area in contact with the static valve shaft, and a number of static valve holes matching the dynamic valve holes are opened on the side wall of the static valve shaft.

[0018] When the moving valve shaft rotates, the moving valve hole and the corresponding static valve hole are sometimes connected and sometimes not connected; when the moving valve hole is connected to the corresponding static valve hole, the high-pressure fluid in the annulus between the lower outer tube and the inner tube assembly enters the moving valve hole from the static valve hole and enters the inner tube assembly, causing the pressure inside the middle inner tube and the space below the piston head to increase; when the moving valve hole is not connected to the corresponding static valve hole, the high-pressure fluid in the annulus between the lower outer tube and the inner tube assembly cannot enter through the moving valve hole, causing the pressure inside the middle inner tube and the space below the piston head to decrease. This solution utilizes the energy of the high-pressure fluid produced by hydrate extraction to obtain the required pressure fluctuations without the need to set up an additional pressure source, significantly improving the operability of the oscillating gel-breaking and separation device, while avoiding the problems of the device being bulky and inconvenient to enter the well.

[0019] Of course, the driving mechanism in the present application can adopt any existing method to provide power to the movable valve shaft, as long as it can make the movable valve shaft rotate.

[0020] Furthermore, the driving mechanism includes a flow-changing sleeve connected to the bottom of the movable valve shaft and a power shaft circumferentially fixed to the flow-changing sleeve, and the power shaft is driven to rotate by a power drilling tool.

[0021] As is common knowledge in the field, the downhole power drill in the process of hydrate extraction is driven by high-pressure fluid and must rotate during operation. This solution utilizes the rotational energy of the downhole power drill to drive the power shaft to rotate, thereby driving the flow conversion sleeve to rotate, and finally driving the movable valve shaft to rotate.

[0022] This solution utilizes the existing power drill in the hydrate mining process to drive the movable valve shaft, without the need for an additional power source, significantly improving the operability of the oscillating gel breaking and separation device, while avoiding additional burden on the device. The power shaft can be a part of the power drill, or it can be linked to the power drill through other transmission structures. The power drill in this solution can be any downhole power drill in the prior art, such as a screw drill, a rotary guide drill, etc.

[0023] Furthermore, the inner tube assembly also includes a transition sleeve connected below the static valve shaft and a lower inner tube connected below the transition sleeve; the commutation sleeve is located in the lower inner tube.

[0024] The power shaft is coaxial with the commutation sleeve, and the power shaft blocks the bottom end of the commutation sleeve; a plurality of inflow holes are provided on the side wall of the commutation sleeve.

[0025] The upwardly returning hydrate slurry enters the lower inner layer pipe, enters the inflow hole through the annulus between the lower inner layer pipe and the exchange sleeve, and then enters the exchange sleeve to continue to flow upward.

[0026] Furthermore, it also includes a stop ring disposed between the lower inner layer pipe and the movable valve shaft, and the stop ring is located above the inflow hole. The stop ring blocks the annular space between the lower inner layer pipe and the movable valve shaft, so that the hydrate slurry can only flow upward through the inflow hole, ensuring that the hydrate slurry stably returns along the designated path.

[0027] Furthermore, it also includes a double-layer pipe joint connected to the lower outer layer pipe and the top of the rubber-breaking sleeve, an upper outer layer pipe and an upper inner layer pipe connected above the double-layer pipe joint, and the upper inner layer pipe is located inside the upper outer layer pipe; a downward flow channel and an upward flow channel are arranged in the double-layer pipe joint;

[0028] The top end of the descending flow channel is connected to the annulus between the upper outer layer pipe and the upper inner layer pipe, and the bottom end of the descending flow channel is connected to the annulus between the lower outer layer pipe and the rubber breaking sleeve;

[0029] The top end of the upward flow channel is communicated with the interior of the upper inner layer tube, and the bottom end of the upward flow channel is communicated with the interior of the rubber-breaking sleeve.

[0030] This solution clearly defines the structure of the lower outer layer pipe and the top of the debonding sleeve, which is convenient for adapting to the existing double-layer drill pipe in the hydrate production string, ensuring smooth flow of high-pressure fluid and hydrate slurry and ensuring the versatility of this application.

[0031] Furthermore, it also includes an upper joint connected to the top of the upper inner layer tube, and a cyclone arranged in the upper inner layer tube, a tangential inlet is arranged on the side of the cyclone, an overflow is arranged on the top, and an underflow port is arranged on the bottom, the tangential inlet is connected to the interior of the upper inner layer tube, the overflow port runs through the upper joint, the underflow port is connected to the sand discharge channel, and the sand discharge channel is located in the double-layer pipe joint and extends to the side wall of the double-layer pipe joint.

[0032] The hydrate slurry after degelling treatment by the oscillating element enters the upper inner layer pipe and enters the cyclone through the tangential inlet. The separated mud and sand particles enter the sand discharge channel through the bottom flow port and are discharged. The separated hydrate continues to flow back upward through the overflow port.

[0033] Compared with the prior art, the present invention has at least the following advantages and beneficial effects:

[0034] 1. The present invention provides an oscillating debonding and separation device for marine hydrate cemented particles. The oscillating element performs axial reciprocating motion, and can synchronously oscillate and crush the hydrate slurry under the action of centrifugal force, thereby significantly optimizing the debonding effect on cemented hydrate particles and sand particles, improving the debonding efficiency of cemented particles, and improving the recovery rate of natural gas hydrates.

[0035] 2. The present invention provides an oscillating degelling and separation device for marine hydrate agglomerates, which utilizes the energy of the high-pressure fluid produced during hydrate extraction to obtain the required pressure fluctuations without the need for an additional pressure source or pressure control module, thereby significantly improving the operability of the oscillating degelling and separation device.

[0036] 3. The oscillating debonding and separation device for marine hydrate agglomerated particles of the present invention utilizes the existing power drilling tools in the hydrate exploitation process to drive the movable valve shaft. It does not require an additional power source, significantly improves the operability of the oscillating debonding and separation device, and avoids causing additional burden to the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0038] Figure 1 It is a schematic diagram of a specific embodiment of the present invention when the moving valve hole and the static valve hole are not connected;

[0039] Figure 2 It is a schematic diagram of a specific embodiment of the present invention when the moving valve hole and the static valve hole are connected.

[0040] Marks and corresponding parts names in the attached drawings:

[0041] 1-upper outer tube, 2-double-layer pipe joint, 201-downward flow channel, 202-upward flow channel, 203-sand discharge flow channel, 3-lower outer tube, 4-power shaft, 5-lower inner tube, 6-adapter sleeve, 7-static valve shaft, 701-static valve hole, 8-flow change sleeve, 801-inflow hole, 9-stop ring, 10-bearing group, 11-moving valve shaft, 1101-moving valve hole, 12-middle inner tube, 13-piston head, 14-elastic member, 15-first sealing ring, 16-thrust sleeve, 17-driving shaft, 1701-outflow hole, 18-glue breaking sleeve, 19-oscillation element, 20-cyclone, 2001-tangential inlet, 2002-overflow port, 2003-bottom flow port, 21-upper inner tube, 22-upper joint, 23-second sealing ring. DETAILED DESCRIPTION

[0042] In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the examples and the accompanying drawings. The schematic embodiments of the present invention and the description thereof are only used to explain the present invention and are not intended to limit the present invention. In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application.

[0043] Embodiment 1:

[0044] like Figure 1 and Figure 2 The device shown is an oscillating degumming and separation device for marine hydrate agglomerated particles, comprising a lower outer layer tube 3, an inner layer tube assembly located inside the lower outer layer tube 3, the inner layer tube assembly comprising a degumming sleeve 18, an oscillating element 19 being arranged inside the degumming sleeve 18, and a spiral flow channel being arranged on the outer wall of the oscillating element 19; it also comprises a driving shaft 17 connected to the oscillating element 19, and an oscillating mechanism for driving the driving shaft 17 to reciprocate along the axial direction of the lower outer layer tube 3.

[0045] Those skilled in the art should understand that the up / top direction in this embodiment refers to the direction toward the wellhead after the device enters the well; conversely, the down / bottom direction in this embodiment refers to the direction toward the bottom of the well after the device enters the well.

[0046] The inner layer tube assembly in this embodiment also includes a pushed sleeve 16 connected below the rubber breaking sleeve 18 and a middle inner layer tube 12 connected below the pushed sleeve 16; the top end of the pushing shaft 17 is fixedly connected to the bottom of the oscillating element 19 and the bottom end is located in the middle inner layer tube 12.

[0047] The oscillation mechanism includes a piston head 13 located in the middle inner tube 12, an elastic member 14 located in the middle inner tube 12 and having two ends respectively in contact with the piston head 13 and the driving shaft 17, and an excitation component for generating pressure fluctuations in the space inside the middle inner tube 12 and below the piston head 13.

[0048] The elastic member 14 in this embodiment is preferably a disc spring assembly.

[0049] Preferably, a step surface is provided on the outer wall of the driving shaft 17 , so that the top end of the elastic member 14 abuts against the step surface, and the bottom end of the elastic member 14 abuts against the top end of the piston head 13 .

[0050] A plurality of outflow holes 1701 are formed on the side wall of the driving shaft 17 , and the outflow holes 1701 are connected to the spiral flow channel.

[0051] The inner layer tube assembly also includes a static valve shaft 7 connected to the bottom of the middle inner layer tube 12; the excitation assembly includes a dynamic valve shaft 11 rotatably fitted in the static valve shaft 7, and a driving mechanism for driving the dynamic valve shaft 11 to rotate, and the outer wall of the dynamic valve shaft 11 is partially in contact with the inner wall of the static valve shaft 7; a number of annularly distributed dynamic valve holes 1101 are opened in the area of ​​the dynamic valve shaft 11 in contact with the static valve shaft 7, and a number of static valve holes 701 matching the dynamic valve holes 1101 are opened on the side wall of the static valve shaft 7.

[0052] The driving mechanism includes a flow change sleeve 8 connected to the bottom of the movable valve shaft 11, and a power shaft 4 circumferentially fixed to the flow change sleeve 8, and the power shaft 4 is driven to rotate by the downhole power drill. The power shaft 4 is preferably a part of the downhole power drill; of course, the power shaft 4 can also be an independent shaft that can be connected to the downhole power drill through any transmission structure.

[0053] The inner layer tube assembly further includes a transfer sleeve 6 connected below the static valve shaft 7 , and a lower inner layer tube 5 connected below the transfer sleeve 6 ; the commutation sleeve 8 is located inside the lower inner layer tube 5 .

[0054] The power shaft 4 is coaxial with the commutation sleeve 8 , and the power shaft 4 blocks the bottom end of the commutation sleeve 8 ; a plurality of inflow holes 801 are formed on the side wall of the commutation sleeve 8 .

[0055] This embodiment further includes a stop ring 9 disposed between the lower inner tube 5 and the movable valve shaft 11 , and the stop ring 9 is located above the inflow hole 801 .

[0056] In this embodiment, the driving shaft 17 is a hollow shaft with an open bottom, and the piston head 13 is hollow inside and communicates with the inside of the driving shaft 17. In addition, the movable valve shaft 11 and the commutation sleeve 8 are also hollow structures.

[0057] In this embodiment, the movable valve holes 1101 and the static valve holes 701 are matched one by one, that is, when any movable valve hole 1101 rotates to be opposite to any static valve hole 701, the remaining movable valve holes 1101 are also opposite to one static valve hole 701. When any movable valve hole 1101 rotates to be not connected to any static valve hole 701, the remaining movable valve holes 1101 are also not connected to any static valve hole 701. The specific number of movable valve holes 1101 and static valve holes 701 is not specifically limited here, and different numbers of movable valve holes and static valve holes can be configured according to specific working conditions, thereby changing the axial oscillation frequency of the oscillating element 19.

[0058] In a more preferred embodiment, the axis of the inflow hole 801 gradually tilts upward from outside to inside along the radial direction; the axis of the outflow hole 1701 gradually tilts upward from inside to outside along the radial direction.

[0059] In a more preferred embodiment, a bearing assembly 10 is provided between the movable valve shaft 11 and the adapter sleeve 6 or the stationary valve shaft 7 to ensure stable rotation of the movable valve shaft 11 .

[0060] In a more preferred embodiment, a first sealing ring 15 is provided between the driving shaft 17 and the pushed sleeve 16, and a second sealing ring 23 is provided between the driving shaft 17 and the rubber-breaking sleeve 18, so as to ensure that the driving shaft 17 has good dynamic sealing performance.

[0061] When this embodiment is used, both the upper and lower ends can be connected to the existing natural gas hydrate production pipe string, and the oscillating gel breaking and separation device of this application only needs to be above the downhole power drill. Preferably, the oscillating gel breaking and separation device of this application can be as close to the downhole power drill as possible.

[0062] Embodiment 2:

[0063] A marine hydrate cementing particle oscillation debonding and separation device, based on Example 1, please refer to Figure 1 and Figure 2 , further comprising a double-layer pipe joint 2 connected to the lower outer layer pipe 3 and the top of the rubber-breaking sleeve 18, an upper outer layer pipe 1 and an upper inner layer pipe 21 connected above the double-layer pipe joint 2, wherein the upper inner layer pipe 21 is located inside the upper outer layer pipe 1; a downward flow channel 201 and an upward flow channel 202 are arranged in the double-layer pipe joint 2;

[0064] The top end of the downward flow channel 201 is connected to the annulus between the upper outer layer pipe 1 and the upper inner layer pipe 21, and the bottom end of the downward flow channel 201 is connected to the annulus between the lower outer layer pipe 3 and the rubber breaking sleeve 18;

[0065] The top end of the upward flow channel 202 is communicated with the interior of the upper inner layer tube 21 , and the bottom end of the upward flow channel 202 is communicated with the interior of the rubber breaking sleeve 18 .

[0066] This embodiment also includes an upper joint 22 connected to the top of the upper inner layer tube 21, and a cyclone 20 arranged in the upper inner layer tube 21. The cyclone 20 is provided with a tangential inlet 2001 on the side, an overflow port 2002 on the top, and an underflow port 2003 on the bottom. The tangential inlet 2001 is connected to the interior of the upper inner layer tube 21, the overflow port 2002 passes through the upper joint 22, and the underflow port 2003 is connected to the sand discharge channel 203. The sand discharge channel 203 is located in the double-layer pipe joint 2 and extends to the side wall of the double-layer pipe joint 2.

[0067] In this embodiment, the outer diameter of the cyclone 20 gradually increases from bottom to top, so that the cross-sectional area of ​​the annulus between the cyclone 20 and the upper inner tube 21 gradually decreases from bottom to top, so that the fluid accelerates to flow upward after entering the upper inner tube 21, enters the tangential inlet 2001 at a faster flow rate, and has a larger initial velocity in the cyclone 20, which is conducive to the hydrate slurry obtaining a greater centrifugal force in the cyclone 20, improves the separation ability of hydrates and mud and sand, and can use centrifugal force to break the gel again, further improving the gel breaking ability of the present application.

[0068] Embodiment 3:

[0069] A method for separating marine hydrate cemented particles by oscillation and degelling, based on Figure 1 and Figure 2 The gel breaking and separation device shown is implemented, and the method includes the following process:

[0070] The high-pressure fluid is pumped from top to bottom to the annulus between the upper outer layer pipe 1 and the upper inner layer pipe 21, enters the annulus between the lower outer layer pipe 3 and the inner layer pipe assembly through the downward flow channel 201 inside the double-layer pipe joint 2, and continues to flow downward until it enters the downhole power drill, causing the downhole power drill to rotate for drilling, and simultaneously performing high-pressure jet crushing on the seabed hydrate during the drilling process.

[0071] The hydrate slurry obtained by drilling and high-pressure jet crushing enters the annulus between the lower inner layer pipe 5 and the exchange sleeve 8 under the action of lifting, enters the hollow flow channel inside the exchange sleeve 8 through the inflow hole 801, and then passes through the hollow flow channel inside the moving valve shaft 11, the hollow flow channel inside the static valve shaft 7, the hollow flow channel inside the middle inner layer pipe 12, the hollow flow channel inside the piston head 13 and the hollow flow channel inside the push shaft 17 from bottom to top, flows out from the outflow hole 1701, enters the spiral flow channel between the breaking sleeve 18 and the oscillating element 19, flows upward along the spiral flow channel, and then enters the upper inner layer pipe 21 through the upward flow channel 202, enters the cyclone 20 through the tangential inlet 2001, and the separated mud and sand enter the sand discharge flow channel 203 through the bottom flow port 2003 and are discharged, and the separated hydrate enters the internal flow channel of the upper joint 22 through the overflow port 2002 and continues to be transported upward to the next link.

[0072] In the above process, the rotation of the downhole power drilling tool drives the power shaft 4 to rotate, and the power shaft 4 drives the commutation sleeve 8 to rotate, and the commutation sleeve 8 drives the movable valve shaft 11 to rotate:

[0073] When the moving valve hole 1101 on the moving valve shaft 11 is radially connected with the static valve hole 701 on the static valve shaft 7, as shown in FIG. Figure 2As shown, the high-pressure fluid in the annulus between the lower outer tube 3 and the static valve shaft 7 enters the interior of the moving valve shaft 11, causing the fluid pressure in the bottom area of ​​the piston head 13 to increase rapidly. The piston head 13 moves upward under the action of pressure, pushing the driving shaft 17 to move upward synchronously and compressing the elastic member 14. The driving shaft 17 drives the oscillating element 19 to move axially upward.

[0074] When the movable valve shaft 11 continues to rotate, the movable valve hole 1101 on the movable valve shaft 11 is not connected to the static valve hole 701 on the static valve shaft 7 in the radial direction. Figure 1 As shown, the high-pressure fluid in the annulus between the lower outer tube 3 and the static valve shaft 7 cannot directly enter the interior of the moving valve shaft 11, the pressure in the bottom area of ​​the piston head 13 decreases rapidly, the compressed elastic member 14 releases the elastic force, and pushes the piston head 13 and the driving shaft 17 to move axially downward, and the driving shaft 17 drives the oscillating element 19 to move axially downward;

[0075] This reciprocating motion enables the oscillating element 19 to achieve rapid and continuous axial oscillating motion, and the cemented particles of hydrate and sand are oscillated and crushed in the spiral flow channel between the crushing sleeve 18 and the oscillating element 19, which greatly improves the crushing efficiency of the cemented particles.

[0076] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0077] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In addition, the term "connected" used in this article can be directly connected or indirectly connected via other components without special explanation.

Claims

1. A marine hydrate cementing particle oscillation debonding and separation device, comprising a lower outer layer tube (3), and an inner layer tube assembly located inside the lower outer layer tube (3), characterized in that: The inner tube assembly comprises a rubber-breaking sleeve (18), an oscillating element (19) is arranged inside the rubber-breaking sleeve (18), and a spiral flow channel is arranged on the outer wall of the oscillating element (19); it also comprises a driving shaft (17) connected to the oscillating element (19), and an oscillating mechanism for driving the driving shaft (17) to perform reciprocating motion along the axial direction of the lower outer tube (3).

2. The marine hydrate cementing particle oscillation degelling and separation device according to claim 1, characterized in that: The inner layer pipe assembly further comprises a push sleeve (16) connected below the rubber-breaking sleeve (18), and a middle inner layer pipe (12) connected below the push sleeve (16); The top end of the driving shaft (17) is connected to the bottom of the oscillating element (19), and the bottom end is located inside the middle inner layer tube (12); The oscillating mechanism comprises a piston head (13) located in the middle inner tube (12), an elastic member (14) located in the middle inner tube (12) and having two ends respectively in contact with the piston head (13) and a driving shaft (17), and an excitation component for generating pressure fluctuations in the space inside the middle inner tube (12) and below the piston head (13).

3. The marine hydrate cementing particle oscillation debonding and separation device according to claim 2, characterized in that: A plurality of outflow holes (1701) are provided on the side wall of the driving shaft (17), and the outflow holes (1701) are connected to the spiral flow channel.

4. The marine hydrate cementing particle oscillation degelling and separation device according to claim 2, characterized in that: The inner tube assembly also includes a static valve shaft (7) connected to the lower part of the middle inner tube (12); the excitation assembly includes a dynamic valve shaft (11) rotatably fitted in the static valve shaft (7), and a driving mechanism for driving the dynamic valve shaft (11) to rotate, and the outer wall of the dynamic valve shaft (11) is partially in contact with the inner wall of the static valve shaft (7); a plurality of annularly distributed dynamic valve holes (1101) are provided on the area of ​​the dynamic valve shaft (11) in contact with the static valve shaft (7), and a plurality of static valve holes (701) matching the dynamic valve holes (1101) are provided on the side wall of the static valve shaft (7).

5. The marine hydrate cementing particle oscillation debonding and separation device according to claim 4, characterized in that: The driving mechanism comprises a flow-changing sleeve (8) connected to the bottom of the movable valve shaft (11) and a power rotating shaft (4) circumferentially fixed to the flow-changing sleeve (8); the power rotating shaft (4) is driven to rotate by a power drilling tool.

6. The marine hydrate cementing particle oscillation debonding and separation device according to claim 5, characterized in that: The inner layer tube assembly further comprises a transition sleeve (6) connected below the static valve shaft (7) and a lower inner layer tube (5) connected below the transition sleeve (6); the commutation sleeve (8) is located inside the lower inner layer tube (5).

7. The marine hydrate cementing particle oscillation debonding and separation device according to claim 6, characterized in that: The power shaft (4) is coaxial with the commutation sleeve (8), and the power shaft (4) blocks the bottom end of the commutation sleeve (8); a plurality of inflow holes (801) are provided on the side wall of the commutation sleeve (8).

8. The marine hydrate cementing particle oscillation debonding and separation device according to claim 7, characterized in that: It also includes a stop ring (9) arranged between the lower inner layer tube (5) and the movable valve shaft (11), and the stop ring (9) is located above the inflow hole (801).

9. The marine hydrate cementing particle oscillation debonding and separation device according to claim 1, characterized in that: It also comprises a double-layer pipe joint (2) connected to the lower outer layer pipe (3) and the top of the rubber-breaking sleeve (18), an upper outer layer pipe (1) and an upper inner layer pipe (21) connected above the double-layer pipe joint (2), wherein the upper inner layer pipe (21) is located inside the upper outer layer pipe (1); a downward flow channel (201) and an upward flow channel (202) are arranged inside the double-layer pipe joint (2); The top end of the downward flow channel (201) is connected to the annulus between the upper outer layer pipe (1) and the upper inner layer pipe (21), and the bottom end of the downward flow channel (201) is connected to the annulus between the lower outer layer pipe (3) and the rubber-breaking sleeve (18); The top end of the upward flow channel (202) is communicated with the interior of the upper inner layer tube (21), and the bottom end of the upward flow channel (202) is communicated with the interior of the rubber-breaking sleeve (18).

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