A marine hydrate cemented particle oscillation breaking and separation device

Abstract

The present invention discloses an oscillating gel-breaking and separation device for marine hydrate cementing particles, comprising a lower outer tube, an inner tube assembly located within the lower outer tube, the inner tube assembly including a gel-breaking sleeve, an oscillating element disposed within the gel-breaking sleeve, and a spiral flow channel disposed on the outer wall of the oscillating element; 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 tube. The present invention provides an oscillating gel-breaking and separation device for marine hydrate cementing particles to address the problems of low gel-breaking force and limited gel-breaking and separation effects on cementing particles in the prior art, thereby improving the gel-breaking efficiency of cementing particles and thereby improving hydrate recovery efficiency.

Description

Technical Field

[0001] The present invention relates to the field of hydrate mining, and in particular to a device for oscillating and breaking the gel and separating marine hydrate cemented particles. Background Art

[0002] Natural gas hydrates are ice-like crystalline substances formed by natural gas and water under high pressure and low temperature. Because they resemble ice and ignite upon contact with fire, they are also known as "combustible ice." Natural gas hydrates are found in the deep sea or in permafrost on land. Combustion produces only small amounts of carbon dioxide and water, producing far less pollution than coal and oil. Natural gas hydrates are also abundant. They are typically found in surface sediments at depths 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-state fluidized bed mining has been proposed in the prior art and successfully tested. The core idea of ​​the solid-state fluidized bed mining method is to use a water jet to break up the hydrate reservoir and fluidize it into a 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 the 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 the hydrate.

[0004] In the prior art: Chinese patent publication number CN109882147A discloses "a large-capacity integrated downhole in-situ hydrate separation parallel device", which connects traditional separators in parallel, thereby improving the working capacity of the separators and optimizing the separator parallel connection method; however, this technology is mainly aimed at the centrifugal separation of mud and sand, and its target is dispersed hydrates and sand particles, and its debonding ability is weak when the two are bonded to each other. Chinese patent publication number CN113090244A discloses "a natural gas hydrate cyclone self-rotation debonding method and separation device", which is composed of a preliminary debonder, a cyclone debonding cylinder and a cyclone separation cylinder. It 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 drilling wellbore diameter, reducing reservoir stability, and increasing the risk of wellbore reservoir collapse. Chinese patent publication number CN113153235A discloses "a natural gas hydrate downhole hydraulic crushing recovery and separation device." This device uses the strong shearing effect of a cyclonic flow field to break and separate weakly cemented 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 relatively weak.

[0005] In summary, the existing hydrate recovery technologies generate relatively small breaking forces, which have limited effects on breaking and separating cemented particles in hydrate slurries, resulting in low hydrate recovery efficiency. Summary of the Invention

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

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

[0008] A marine hydrate cementation particle oscillation breaking and separation device comprises a lower outer layer tube, an inner layer tube assembly located within the lower outer layer tube, the inner layer tube assembly comprising a breaking sleeve, an oscillating element disposed within the breaking sleeve, and a spiral flow channel disposed on the outer wall of the oscillating element; the device also comprises a driving shaft connected to the oscillating element and an oscillating mechanism for driving the driving shaft to perform reciprocating motion along the axial direction of the lower outer layer tube.

[0009] In response to the problems that the existing technology has a small breaking force and limited breaking and separation effect on cemented particles during hydrate mining, the present invention proposes an oscillating breaking and separation device for marine hydrate cemented particles. Based on the double-layer tube technology in hydrate mining, this solution has structures such as a lower outer tube and an inner tube assembly. The inner tube assembly of the present application includes a breaking sleeve, and an oscillation element is arranged inside it. The spiral flow channel on the outer wall of the oscillation element is used to return the hydrate slurry, and the oscillation mechanism drives the driving shaft to perform axial reciprocating motion, thereby causing the oscillation element connected to the driving shaft to perform axial reciprocating motion synchronously.

[0010] When the present application is in operation, it is connected above the downhole power drill, and 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, and the obtained hydrate slurry enters the existing inner tube and returns to the upper part, 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 breaking effect of the bonded hydrate particles and sand particles, improving the breaking efficiency of the bonded particles, and improving the recovery rate of natural gas hydrates.

[0011] Furthermore, the inner layer pipe assembly further comprises a pushed sleeve connected below the rubber breaking sleeve, and a middle inner layer pipe connected below the pushed 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 in contact with 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 inside the middle inner tube and connected to the bottom of the oscillating element. Consequently, the interior of the middle inner tube is connected to the spiral flow channel. When the oscillating mechanism is operating, 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 upward, which in turn drives the driving shaft upward, thereby driving the oscillating element upward. During the upward movement of the piston head, the elastic member is simultaneously compressed. When the pressure drops, the piston head moves downward under the elastic restoring force of the elastic member, which in turn drives the driving shaft downward, thereby driving the oscillating element downward. This reciprocating process allows the axial reciprocating motion of the driving shaft to be achieved 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 area of ​​the dynamic valve shaft that is 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 movable valve shaft rotates, the movable valve hole and the corresponding static valve hole are sometimes connected and sometimes not connected; when the movable 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 movable 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 movable 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 movable 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 for an additional pressure source, significantly improving the operability of the oscillating gel-breaking and separation device while avoiding problems such as the device being bulky and inconvenient to put into 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 cause the movable valve shaft to 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 drill.

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

[0022] This solution utilizes existing power drills used in hydrate extraction to drive the valve shaft, eliminating the need for an additional power source. This significantly improves the operability of the oscillating gel-breaking and separation device while avoiding any additional burden on the device. The power shaft can be a component of the power drill or connected to the power drill through a separate transmission structure. The power drill in this solution can be any downhole power drill known in the art, such as a screw drill or a rotary steerable drill.

[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 upward-flowing 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 interior of the exchange sleeve to continue to flow upward.

[0026] Furthermore, the device further includes a stop ring disposed between the lower inner tube and the movable valve shaft, the stop ring being located above the inlet. The stop ring seals the annular space between the lower inner tube and the movable valve shaft, allowing the hydrate slurry to flow only upward through the inlet, thereby ensuring that the hydrate slurry flows upward stably along a designated path.

[0027] Furthermore, it also includes a double-layer pipe joint connected to the lower outer tube and the top of the rubber-breaking sleeve, an upper outer tube and an upper inner tube connected above the double-layer pipe joint, and the upper inner tube is located inside the upper outer tube; a downward flow channel and an upward flow channel are set 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 breaker sleeve, which is convenient for adapting to the existing double-layer drill pipe in the hydrate production string, ensuring the smooth flow of high-pressure fluid and hydrate slurry and 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. The cyclone has a tangential inlet on the side, an overflow port on the top, and an underflow port on the bottom. The tangential inlet is connected to the interior of the upper inner layer tube, the overflow port passes through the upper joint, and the underflow port is connected to the sand discharge channel. 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] After the hydrate slurry is broken by the oscillating element, it 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, which can synchronously oscillate and crush the hydrate slurry under the action of centrifugal force, thereby significantly optimizing the debonding effect of cemented hydrate particles and sand particles, improving the debonding efficiency of cemented particles, and increasing the recovery rate of natural gas hydrates.

[0035] 2. The present invention provides an oscillating gel-breaking and separation device for marine hydrate agglomerated particles. The device utilizes the energy of the high-pressure fluid in hydrate mining 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 gel-breaking and separation device.

[0036] 3. The present invention provides an oscillating gel-breaking and separation device for marine hydrate agglomerated particles. It utilizes the existing power drilling tools in the hydrate mining process to drive the movable valve shaft. It does not require an additional power source, significantly improves the operability of the oscillating gel-breaking and separation device, and avoids causing additional burden on 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 This is a schematic diagram of a specific embodiment of the present invention when the dynamic valve hole and the static valve hole are not connected;

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

[0040] Markings and corresponding parts names in the accompanying 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-changing 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-pushing 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 more clear, the present invention is further described in detail below in conjunction with the examples and drawings. The schematic embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention. In the description of this application, it should be understood that the orientations or positional relationships indicated by terms such as "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are 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 this application.

[0043] Example 1:

[0044] like Figure 1 and Figure 2 The device shown is an oscillating gel-breaking and separation device for marine hydrate agglomerated particles, comprising a lower outer layer tube 3 and an inner layer tube assembly located inside the lower outer layer tube 3; the inner layer tube assembly comprises a gel-breaking sleeve 18, an oscillating element 19 is arranged inside the gel-breaking sleeve 18, and a spiral flow channel is arranged on the outer wall of the oscillating element 19; the device 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 layer tube 3.

[0045] Those skilled in the art should understand that the direction indicated by "up / top" in this embodiment refers to the direction toward the wellhead after the device enters the well; conversely, the direction indicated by "down / bottom" 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 layer tube 12, an elastic member 14 located in the middle inner layer tube 12 and in contact with the piston head 13 and the driving shaft 17 at both ends, and an excitation component for generating pressure fluctuations inside the middle inner layer tube 12 and in the space 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] The side wall of the driving shaft 17 is provided with a plurality of outflow holes 1701 , and the outflow holes 1701 are communicated with 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 on the area of ​​the dynamic valve shaft 11 that is 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 drive mechanism includes a flow-commutating sleeve 8 connected to the bottom of the movable valve shaft 11 and a power shaft 4 circumferentially fixed to the flow-commutating sleeve 8. The power shaft 4 is driven for rotation by a downhole power drill. The power shaft 4 is preferably part of the downhole power drill; however, the power shaft 4 can also be an independent shaft connected to the downhole power drill via any transmission structure.

[0053] The inner layer tube assembly further includes 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 .

[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 flow-stop ring 9 disposed between the lower inner tube 5 and the movable valve shaft 11 . The flow-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 interior of the piston head 13 is hollow and communicates with the interior 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 stationary valve holes 701 are matched one-to-one. That is, when any movable valve hole 1101 rotates to face any stationary valve hole 701, the remaining movable valve holes 1101 also face one stationary valve hole 701. When any movable valve hole 1101 rotates to no longer communicate with any stationary valve hole 701, the remaining movable valve holes 1101 also no longer communicate with any stationary valve hole 701. The specific number of movable valve holes 1101 and stationary valve holes 701 is not specifically limited herein; different numbers of movable valve holes and stationary valve holes can be configured according to specific operating conditions, thereby varying 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 static 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 pushing shaft 17 and the pushed sleeve 16 , and a second sealing ring 23 is provided between the pushing shaft 17 and the rubber-breaking sleeve 18 to ensure that the pushing shaft 17 has good dynamic sealing performance.

[0061] When in use, the upper and lower ends of this embodiment can be connected to the existing natural gas hydrate extraction 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] Example 2:

[0063] A marine hydrate cementation particle oscillation breaking 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, the upper inner layer pipe 21 being located inside the upper outer layer pipe 1; a downward flow channel 201 and an upward flow channel 202 are provided in the double-layer pipe joint 2;

[0064] The top 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 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 layer tube 21 gradually decreases from bottom to top, thereby causing the fluid to accelerate upward flow after entering the upper inner layer tube 21 and enter the tangential inlet 2001 at a faster flow rate, with a greater initial velocity in the cyclone 20, which is conducive to the hydrate slurry obtaining a greater centrifugal force in the cyclone 20, thereby improving the separation ability of hydrates and mud and sand, and at the same time, the centrifugal force can be used to break the gel again, further improving the gel breaking ability of the present application.

[0068] Example 3:

[0069] A method for separating marine hydrate cemented particles by oscillation and gel breaking is 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 synchronously 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 movable 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 gel-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 for discharge, 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, which in turn drives the commutation sleeve 8 to rotate, and the commutation sleeve 8 drives the movable valve shaft 11 to rotate:

[0073] When the movable valve hole 1101 on the movable valve shaft 11 is radially connected to 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 dynamic 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 push shaft 17 to move upward synchronously and compress the elastic member 14. The push 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 movable valve shaft 11, and the pressure in the bottom area of ​​the piston head 13 drops rapidly. The compressed elastic member 14 releases its elastic force, pushing 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 breaking sleeve 18 and the oscillating element 19, which greatly improves the breaking 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 document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises", or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In addition, the term "connected" as used in this document, unless otherwise specified, may refer to a direct connection or an indirect connection via other components.

Claims

1. A marine hydrate cementation particle oscillation breaking 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 includes a rubber-breaking sleeve (18), an oscillating element (19) is provided in the rubber-breaking sleeve (18), and a spiral flow channel is provided on the outer wall of the oscillating element (19); and further includes 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); The inner layer pipe assembly further includes a pushed sleeve (16) connected below the rubber-breaking sleeve (18), and a middle inner layer pipe (12) connected below the pushed 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 in 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 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); A plurality of outflow holes (1701) are provided on the side wall of the driving shaft (17), and the outflow holes (1701) are communicated with the spiral flow channel; The inner tube assembly further comprises a static valve shaft (7) connected to the lower portion of the middle inner tube (12); the excitation assembly comprises a movable valve shaft (11) rotatably fitted in the static valve shaft (7), and a driving mechanism for driving the movable valve shaft (11) to rotate, wherein the outer wall of the movable valve shaft (11) is partially in contact with the inner wall of the static valve shaft (7); a plurality of annularly distributed movable valve holes (1101) are provided on the movable valve shaft (11) in an area in contact with the static valve shaft (7), and a plurality of static valve holes (701) matching the movable valve holes (1101) are provided on the side wall of the static valve shaft (7); The driving mechanism comprises a commutation sleeve (8) connected to the bottom of the movable valve shaft (11), and a power rotating shaft (4) circumferentially fixed to the commutation sleeve (8); the power rotating shaft (4) is driven to rotate by a power drilling tool.

2. The marine hydrate cementing particle oscillation breaking and separation device according to claim 1, characterized in that: The inner tube assembly further comprises a switching sleeve (6) connected below the static valve shaft (7) and a lower inner tube (5) connected below the switching sleeve (6); the commutation sleeve (8) is located inside the lower inner tube (5).

3. The marine hydrate cementing particle oscillation breaking and separation device according to claim 2, 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).

4. The marine hydrate cementing particle oscillation breaking and separation device according to claim 3, characterized in that: It also includes a flow-stop ring (9) arranged between the lower inner layer tube (5) and the movable valve shaft (11), and the flow-stop ring (9) is located above the inflow hole (801).

5. The marine hydrate cementing particle oscillation breaking and separation device according to claim 1, characterized in that: It also includes 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), and 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 provided in 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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