CN108612515A - A kind of sea bottom hydrate underground separator with spiral current stabilization cone - Google Patents
A kind of sea bottom hydrate underground separator with spiral current stabilization cone Download PDFInfo
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- CN108612515A CN108612515A CN201810623356.9A CN201810623356A CN108612515A CN 108612515 A CN108612515 A CN 108612515A CN 201810623356 A CN201810623356 A CN 201810623356A CN 108612515 A CN108612515 A CN 108612515A
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- 230000006641 stabilisation Effects 0.000 title claims abstract description 10
- 238000011105 stabilization Methods 0.000 title claims abstract description 10
- 238000000926 separation method Methods 0.000 claims abstract description 40
- 210000002445 nipple Anatomy 0.000 claims abstract description 31
- 239000002002 slurry Substances 0.000 claims abstract description 11
- 239000004576 sand Substances 0.000 claims description 58
- 230000000087 stabilizing effect Effects 0.000 claims description 44
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 claims description 33
- 239000007788 liquid Substances 0.000 claims description 31
- 239000011268 mixed slurry Substances 0.000 claims description 25
- 239000012530 fluid Substances 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000002245 particle Substances 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 abstract 3
- 238000009434 installation Methods 0.000 abstract 1
- 239000013049 sediment Substances 0.000 abstract 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000005243 fluidization Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
- E21B43/38—Arrangements for separating materials produced by the well in the well
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0099—Equipment or details not covered by groups E21B15/00 - E21B40/00 specially adapted for drilling for or production of natural hydrate or clathrate gas reservoirs; Drilling through or monitoring of formations containing gas hydrates or clathrates
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Underground Or Underwater Handling Of Building Materials (AREA)
Abstract
Description
技术领域technical field
本发明涉及到海底天然气水合物开采技术领域，尤其涉及一种带螺旋稳流锥的海底水合物井下分离装置。The invention relates to the technical field of seabed natural gas hydrate exploitation, in particular to a seabed hydrate downhole separation device with a spiral stabilizing cone.
背景技术Background technique
天然气水合物又称“可燃冰”，由甲烷为主的烃类气体和水在一定的温度压力条件下形成的“笼型化合物”，呈白色晶状结构。其含碳量相当于全世界已知煤炭、石油和天然气等能源总储量的两倍。因此，天然气水合物特别是海洋天然气水合物被普遍认为将是21世纪替代煤炭、石油和天然气的新型的洁净的能源资源，同时也是目前尚未开发的储量大的一种新能源。Natural gas hydrate, also known as "combustible ice", is a "cage compound" formed by methane-based hydrocarbon gas and water under certain temperature and pressure conditions, and has a white crystalline structure. Its carbon content is equivalent to twice the total known reserves of energy sources such as coal, oil and natural gas in the world. Therefore, natural gas hydrate, especially marine natural gas hydrate, is generally considered to be a new type of clean energy resource to replace coal, oil and natural gas in the 21st century, and it is also a new energy source with large reserves that have not yet been developed.
2017年5月中旬，全球首次针对海洋弱胶结、非成岩水合物的固态流化试采工程在南海神狐海域开始试采并成功点火。固态流化开采是在基本不改变储层的温度和压力条件下，通过射流破碎方式，破碎固态水合物层，同时收集流化后的混合浆体，再继续向上返输到井下分离装置进行水合物和泥砂的分离，水合物浆体通过连续双层管向上输送至海面，分离出的泥砂回填固化开采层，防止开采层垮塌。井下分离装置的分离效果，对开采过程中设备的使用寿命也具有重要的影响。因此井下分离装置对于海底天然气水合物的开采具有重要的工程意义。目前应用于水合物固态流化开采的井下分离装置存在压降大、能耗高、分离效率低等问题。In mid-May 2017, the world's first solid-state fluidized test mining project for marine weakly cemented and non-diagenetic hydrates began in the Shenhu area of the South China Sea and was successfully ignited. Solid-state fluidization mining is to break the solid hydrate layer by jet crushing method under the condition of basically not changing the temperature and pressure of the reservoir, and at the same time collect the fluidized mixed slurry, and then continue to return it to the downhole separation device for hydration The hydrate slurry is transported upwards to the sea surface through continuous double-layer pipes, and the separated mud and sand are backfilled to solidify the production layer to prevent the production layer from collapsing. The separation effect of the downhole separation device also has an important impact on the service life of the equipment in the mining process. Therefore, the downhole separation device has important engineering significance for the exploitation of subsea natural gas hydrate. Currently, downhole separation devices used in solid fluidized hydrate production have problems such as large pressure drop, high energy consumption, and low separation efficiency.
针对现有技术存在的不足与空缺，本发明提出一种带螺旋稳流锥的海底水合物井下分离装置。Aiming at the deficiencies and vacancies in the prior art, the present invention proposes a subsea hydrate downhole separation device with a spiral stabilizing cone.
发明内容Contents of the invention
本发明针对现有开采海底天然气水合物技术中井下分离装置的不足，提供了一种带螺旋稳流锥的海底水合物井下分离装置。The invention aims at the deficiency of the downhole separation device in the prior art of exploiting seabed natural gas hydrate, and provides a seabed hydrate downhole separation device with a spiral stabilizing cone.
一种带螺旋稳流锥的海底水合物井下分离装置，其特征在于：包括上接头、分离器短节、螺旋稳流锥、分离器、下接头；所述的上接头上端与其它工具螺纹连接，上接头下端与分离器短节的上端螺纹连接；所述的分离器短节分为内管和外管，内管中的上部设置用于流体转向和稳流的螺旋稳流锥，设置用于压紧上固定盘的上固定筒，设置固定直筒的上固定盘；内管中的下部设置用于固定锥筒的下固定盘，设置用于压紧下固定盘的下固定筒，设置用于固定下固定筒和排砂管的下挂头；分离器短节上端与上接头下端螺纹连接，分离器短节下端与下接头上端螺纹连接；所述的下接头内设置排砂筒，排砂筒内有排砂通道，排砂通道内口连接分离器中的排砂管，外端的排出口用于连接泥砂回填的输砂装置，下接头上端与分离器短节的下端螺纹连接，下接头下端与其它工具螺纹连接。所述的分离器设置在分离器短节的内管中，分离器中的溢流管设置外螺纹与螺旋稳流锥内孔连接，分离器中的排砂管下端设置外螺纹与排砂通道内口连接；所述的上接头、分离器短节和下接头的环空为海底天然气水合物开采的进液通道，分离器短节和下接头的内腔为混合浆体的返液通道，上接头的内腔为水合物浆体的返液通道。A subsea hydrate downhole separation device with a spiral stabilizing cone, characterized in that it includes an upper joint, a separator nipple, a spiral stabilizing cone, a separator, and a lower joint; the upper end of the upper joint is threadedly connected with other tools , the lower end of the upper joint is threadedly connected with the upper end of the separator nipple; the separator nipple is divided into an inner pipe and an outer pipe, and the upper part of the inner pipe is provided with a spiral steady flow cone for fluid steering and steady flow. The upper fixed cylinder for pressing the upper fixed disk is provided with the upper fixed disk for fixing the straight cylinder; the lower part of the inner tube is provided with the lower fixed disk for fixing the cone cylinder, and the lower fixed cylinder for pressing the lower fixed disk is provided for setting The upper end of the separator nipple is threaded to the lower end of the upper joint, and the lower end of the separator nipple is threaded to the upper end of the lower joint; the lower joint is provided with a sand discharge cylinder to discharge There is a sand discharge channel in the sand cylinder, the inner port of the sand discharge channel is connected to the sand discharge pipe in the separator, and the discharge port at the outer end is used to connect the sand conveying device for mud and sand backfill, the upper end of the lower joint is threadedly connected with the lower end of the separator pup, and the lower end The lower end of the connector is threadedly connected with other tools. The separator is arranged in the inner pipe of the separator nipple, the overflow pipe in the separator is provided with an external thread to connect with the inner hole of the spiral steady flow cone, and the lower end of the sand discharge pipe in the separator is provided with an external thread and a sand discharge channel The inner port is connected; the annular space of the upper joint, the separator sub-joint and the lower joint is the liquid inlet channel for the exploitation of subsea natural gas hydrate, and the inner cavity of the separator sub-joint and the lower joint is the return liquid channel of the mixed slurry. The inner cavity of the upper joint is the liquid return channel of the hydrate slurry.
进一步的技术方案中，所述的上接头为双层结构，包括内接头A和外接头A，内接头A和外接头A依靠肋板A连接，内接头A的上端设置外螺纹，外接头A的上端设置外螺纹，上接头上端与其它工具螺纹连接，内接头A的下端设置内螺纹，外接头A的下端设置内螺纹，上接头下端与分离器短节的上端螺纹连接；上接头的环空为海底天然气水合物开采的进液通道，上接头的内腔为水合物浆体的返液通道。In a further technical solution, the upper joint has a double-layer structure, including an inner joint A and an outer joint A, the inner joint A and the outer joint A are connected by ribs A, the upper end of the inner joint A is provided with external threads, and the outer joint A The upper end of the upper joint is provided with an external thread, the upper end of the upper joint is threaded with other tools, the lower end of the inner joint A is provided with an internal thread, the lower end of the outer joint A is provided with an internal thread, and the lower end of the upper joint is threaded with the upper end of the separator pup joint; the ring of the upper joint The hollow is the liquid inlet channel for subsea natural gas hydrate exploitation, and the inner cavity of the upper joint is the liquid return channel for hydrate slurry.
进一步的技术方案中，所述的分离器短节包括内管和外管，内管的上端设置外螺纹与上接头的内接头A的下端连接，外管的上端设置外螺纹与上接头的外接头A的下端连接，内管的下端设置外螺纹与下接头的内接头B的上端连接，外管的下端设置外螺纹与下接头的外接头B的上端连接；分离器短节的环空为海底天然气水合物开采的进液通道，内管的内腔为混合浆体的返液通道。In a further technical solution, the separator nipple includes an inner pipe and an outer pipe, the upper end of the inner pipe is provided with an external thread to connect with the lower end of the inner joint A of the upper joint, and the upper end of the outer pipe is provided with an external thread and the outer thread of the upper joint. The lower end of the joint A is connected, the lower end of the inner pipe is provided with an external thread to connect with the upper end of the inner joint B of the lower joint, and the lower end of the outer pipe is provided with an external thread to connect with the upper end of the outer joint B of the lower joint; the annular space of the separator pup joint is The liquid inlet channel for the exploitation of seabed natural gas hydrate, the inner cavity of the inner pipe is the return liquid channel of the mixed slurry.
进一步的技术方案中，所述的内管为双头凹形孔结构，内管上部凹形孔内嵌上固定盘，上固定盘上端是用于轴向定位上固定盘的上固定筒，上固定筒上端是用于限制上固定筒轴向移动的螺旋稳流锥；内管下部凹形孔内嵌下固定盘，下固定盘下端是用于轴向定位下固定盘的下固定筒，下固定筒下端是用于限制下固定筒轴向移动的下挂头。In a further technical solution, the inner tube has a double-headed concave hole structure, and the upper fixed plate is embedded in the concave hole on the upper part of the inner tube. The upper end of the upper fixed plate is an upper fixed cylinder for axially positioning the upper fixed plate. The upper end of the fixed cylinder is a spiral stabilizing cone used to limit the axial movement of the upper fixed cylinder; the lower fixed disk is embedded in the concave hole at the lower part of the inner tube, and the lower end of the lower fixed disk is the lower fixed cylinder used for axially positioning the lower fixed disk. The lower end of the fixed cylinder is a lower hanging head for limiting the axial movement of the lower fixed cylinder.
进一步的技术方案中，所述的螺旋稳流锥包括端帽和螺旋锥，螺旋稳流锥设置在分离器短节的内管中，螺旋稳流锥的入口设置在分离器与内管之间的环空，流体经过螺旋稳流锥的端帽实现180度流向变化，通过螺旋锥进入到螺旋叶片。In a further technical solution, the spiral stabilizing cone includes an end cap and a spiral cone, the spiral stabilizing cone is arranged in the inner pipe of the separator pup joint, and the inlet of the spiral stabilizing cone is arranged between the separator and the inner pipe In the annulus, the fluid passes through the end cap of the spiral stabilizing cone to achieve a 180-degree flow direction change, and enters the spiral blade through the spiral cone.
进一步的技术方案中，所述的端帽外端设有外螺纹，外形为环形半球帽状；螺旋锥设置在螺旋叶片的入口，呈螺旋线形与螺旋叶片配合，锥段直径由上到下逐渐增大，能够缓解来液冲击并稳定流场；螺旋稳流锥的中心设有螺纹孔A，与溢流管螺纹连接。In a further technical solution, the outer end of the end cap is provided with an external thread, which is in the shape of an annular hemispherical cap; the spiral cone is arranged at the entrance of the spiral blade, and is in a spiral shape to cooperate with the spiral blade, and the diameter of the cone section gradually increases from top to bottom. The increase can alleviate the impact of the incoming liquid and stabilize the flow field; the center of the spiral stabilization cone is provided with a threaded hole A, which is threaded with the overflow pipe.
进一步的技术方案中，所述的上固定盘中心设置用于套牢分离器直筒段的固定孔A，上固定盘中固定孔A与外环A之间设置有四个辐条A连接，辐条A之间的通孔A为混合浆体的返液通道；所述的下固定盘中心设置用于套牢分离器的锥筒段的固定孔B，下固定盘中固定孔B与外环B之间设置有四个辐条B连接，辐条B之间的通孔B为混合浆体的返液通道；所述的下挂头中心设置螺纹孔B，下挂头螺纹孔B与分离器中的排砂管上部的外螺纹连接，螺纹孔B四周设置四个用于混合浆体返液的通孔C，下挂头与内管的下端螺纹连接。In a further technical solution, the center of the upper fixing disc is provided with a fixing hole A for fastening the straight section of the separator, and there are four spokes A connected between the fixing hole A and the outer ring A in the upper fixing disc. The through hole A between them is the liquid return channel for the mixed slurry; the center of the lower fixed plate is provided with the fixed hole B used to lock the cone section of the separator, and the fixed hole B in the lower fixed plate is set between the outer ring B and the outer ring B. There are four spokes B connected, and the through hole B between the spokes B is the liquid return channel of the mixed slurry; the center of the lower hanging head is provided with a threaded hole B, and the threaded hole B of the lower hanging head is connected with the sand discharge pipe in the separator The upper part is connected by external thread, and four through holes C are arranged around the threaded hole B for returning liquid of mixed slurry, and the lower hanging head is threadedly connected with the lower end of the inner pipe.
进一步的技术方案中，所述的分离器设置在分离器短节的内管中，分离器分为螺旋段和旋流段，螺旋段对混合浆体进行螺旋导流和预分离作用，旋流段对混合浆体进行旋流分离；分离器设置在螺旋稳流锥的下端，分离器中的溢流管设置外螺纹与端帽连接，分离器中的排砂管下端设置外螺纹与排砂通道内口连接。In a further technical solution, the separator is arranged in the inner pipe of the short joint of the separator, and the separator is divided into a spiral section and a swirl section, and the spiral section performs spiral diversion and pre-separation on the mixed slurry, and the swirl section The mixed slurry is separated by cyclone; the separator is set at the lower end of the spiral flow stabilization cone, the overflow pipe in the separator is provided with external thread and connected with the end cap, and the lower end of the sand discharge pipe in the separator is provided with external thread and sand discharge pipe. Channel inner port connection.
进一步的技术方案中，所述的下接头为双层结构，包括内接头B和外接头B，内接头B和外接头B依靠排砂筒和肋板B连接；内接头B的上端设置内螺纹与分离器短节内管的下端连接，外接头B的上端设置内螺纹与分离器短节外管的下端连接，内接头B的下端设置外螺纹，外接头B的下端设置外螺纹，下接头下端与其它工具螺纹连接；排砂筒内有排砂通道，排砂通道内口设置内螺纹连接排砂管，外端的排出口用于连接泥砂回填的输砂装置；下接头的环空为海底天然气水合物开采的进液通道，下接头的内腔为混合浆体的返液通道。In a further technical solution, the lower joint has a double-layer structure, including an inner joint B and an outer joint B, and the inner joint B and the outer joint B are connected by means of the sand discharge cylinder and the rib plate B; the upper end of the inner joint B is provided with an internal thread Connect with the lower end of the inner pipe of the separator nipple, the upper end of the outer joint B is provided with an internal thread to connect with the lower end of the outer pipe of the separator nipple, the lower end of the inner joint B is provided with an outer thread, the lower end of the outer joint B is provided with an outer thread, and the lower joint The lower end is threadedly connected with other tools; there is a sand discharge channel in the sand discharge tube, and the inner port of the sand discharge channel is provided with an internal thread to connect the sand discharge pipe, and the discharge port at the outer end is used to connect the sand delivery device for mud and sand backfill; the annulus of the lower joint is the seabed The liquid inlet channel for the exploitation of natural gas hydrate, the inner cavity of the lower joint is the liquid return channel for the mixed slurry.
与现有技术相比，本发明具有以下有益效果：Compared with the prior art, the present invention has the following beneficial effects:
（1）本发明提出的带螺旋稳流锥的天然气水合物井下分离装置，结构紧凑、体积小、效率高、成本低、内部无运动部件；(1) The natural gas hydrate downhole separation device with a spiral stabilizing cone proposed by the present invention has a compact structure, small volume, high efficiency, low cost, and no moving parts inside;
（2）本发明提出的带螺旋稳流锥的天然气水合物井下分离装置，有效地实现井下分离装置内的压降降低、短路流减少、能耗减少，提高了井下分离装置的处理能力；(2) The natural gas hydrate downhole separation device with a spiral stabilizing cone proposed by the present invention can effectively reduce the pressure drop, short-circuit flow, and energy consumption in the downhole separation device, and improve the processing capacity of the downhole separation device;
（3）本发明提出的带螺旋稳流锥的井下分离装置布置有上接头和下接头，可与其他工具配合使用，安装方便，应用灵活。(3) The downhole separation device with spiral stabilizing cone proposed by the present invention is arranged with an upper joint and a lower joint, which can be used in conjunction with other tools, and is easy to install and flexible in application.
附图说明Description of drawings
图1为本发明一种带螺旋稳流锥的天然气水合物井下分离装置的剖视图；Fig. 1 is a sectional view of a natural gas hydrate downhole separation device with a spiral stabilizing cone of the present invention;
图2为本发明一种带螺旋稳流锥的天然气水合物井下分离装置的局部开口示意图；Fig. 2 is a partial opening schematic diagram of a natural gas hydrate downhole separation device with a spiral stabilizing cone of the present invention;
图3为本发明一种带螺旋稳流锥的天然气水合物井下分离装置的A-A剖视图；Fig. 3 is the A-A cross-sectional view of a natural gas hydrate downhole separation device with a spiral stabilizing cone of the present invention;
图4为本发明一种带螺旋稳流锥的天然气水合物井下分离装置的B-B剖视图；Fig. 4 is a B-B cross-sectional view of a natural gas hydrate downhole separation device with a spiral stabilizing cone of the present invention;
图5为本发明一种带螺旋稳流锥的天然气水合物井下分离装置中的下挂头的结构示意图；Fig. 5 is a structural schematic diagram of the lower hanging head in a natural gas hydrate downhole separation device with a spiral stabilizing cone of the present invention;
图6为本发明一种带螺旋稳流锥的天然气水合物井下分离装置中的上固定盘的结构示意图；Fig. 6 is a schematic structural view of the upper fixed plate in a natural gas hydrate downhole separation device with a spiral stabilizing cone of the present invention;
图7为本发明一种带螺旋稳流锥的天然气水合物井下分离装置中的下固定盘的结构示意图；Fig. 7 is a schematic structural view of the lower fixed plate in the natural gas hydrate downhole separation device with a spiral stabilizing cone of the present invention;
图8为本发明一种带螺旋稳流锥的天然气水合物井下分离装置中的上接头的结构示意图；Fig. 8 is a structural schematic diagram of an upper joint in a natural gas hydrate downhole separation device with a spiral stabilizing cone according to the present invention;
图9为本发明一种带螺旋稳流锥的天然气水合物井下分离装置中的上接头的C-C剖视图；Fig. 9 is a C-C sectional view of the upper joint in a natural gas hydrate downhole separation device with a spiral stabilizing cone of the present invention;
图10为本发明一种带螺旋稳流锥的天然气水合物井下分离装置中的下接头的结构示意图；Fig. 10 is a structural schematic diagram of a lower joint in a natural gas hydrate downhole separation device with a spiral stabilizing cone of the present invention;
图11为本发明一种带螺旋稳流锥的天然气水合物井下分离装置中的下接头的D-D剖视图；Fig. 11 is a D-D cross-sectional view of the lower joint in a natural gas hydrate downhole separation device with a spiral stabilizing cone of the present invention;
图12为本发明一种带螺旋稳流锥的天然气水合物井下分离装置中的螺旋稳流锥的结构示意图；Fig. 12 is a structural schematic diagram of a spiral stabilizing cone in a natural gas hydrate downhole separation device with a spiral stabilizing cone according to the present invention;
图13为本发明一种带螺旋稳流锥的天然气水合物井下分离装置中的螺旋稳流锥的剖视图。Fig. 13 is a cross-sectional view of a spiral stabilizing cone in a downhole separation device for natural gas hydrate with a spiral stabilizing cone according to the present invention.
上述附图中，附图标记对应的部件名称如下：In the above drawings, the names of components corresponding to the reference signs are as follows:
1-上接头，2-溢流管，3-螺旋稳流锥，4-内管，5-上固定盘，6-分离器，7-分离器短节，8-下固定盘，9-下挂头，10-下接头，11-外管，12-上固定筒，13-直筒，14-锥筒，15-下固定筒，16-排砂管，17-排砂筒，18-排砂通道，19-内口，20-排出口，21-螺纹孔A，22-内接头A，23-外接头A，24-肋板A，25-内接头B，26-外接头B，27-肋板B，28-端帽，29-螺旋锥，30-螺旋叶片，31-固定孔A，32-外环A，33-辐条A，34-固定孔B，35-外环B，36-辐条B，37-螺纹孔B，38-通孔，39-螺旋段，40-旋流段。1-upper joint, 2-overflow pipe, 3-spiral steady flow cone, 4-inner pipe, 5-upper fixed plate, 6-separator, 7-separator short joint, 8-lower fixed plate, 9-lower Hanging head, 10-lower joint, 11-outer pipe, 12-upper fixed cylinder, 13-straight cylinder, 14-cone cylinder, 15-lower fixed cylinder, 16-sand discharge pipe, 17-sand discharge cylinder, 18-sand discharge Channel, 19-inner port, 20-outlet, 21-threaded hole A, 22-inner joint A, 23-outer joint A, 24-rib plate A, 25-inner joint B, 26-outer joint B, 27- Rib B, 28-end cap, 29-spiral cone, 30-spiral blade, 31-fixing hole A, 32-outer ring A, 33-spoke A, 34-fixing hole B, 35-outer ring B, 36- Spoke B, 37-threaded hole B, 38-through hole, 39-helical section, 40-swirl section.
具体实施方式Detailed ways
下面结合附图和实施例对本发明作进一步说明，本发明的实施方式包括但不限于下列实施例。The present invention will be further described below with reference to the accompanying drawings and examples, and the embodiments of the present invention include but not limited to the following examples.
实施例Example
本发明的一种带涡流发生器的天然气水合物井下分离装置结构如图1至图12所示，包括上接头1、分离器短节7、螺旋稳流锥3、分离器6、下接头10；所述的上接头1上端与其它工具螺纹连接，上接头1下端与分离器短节7的上端螺纹连接；所述的分离器短节7分为内管4和外管11，内管4中的上部设置用于流体转向和稳流的螺旋稳流锥3，设置固定直筒13的上固定盘5，设置用于压紧上固定盘5的上固定筒12；内管4中的下部设置用于固定锥筒14的下固定盘8，设置用于压紧下固定盘8的下固定筒15，设置用于固定下固定筒15和排砂管16的下挂头9；分离器短节7上端与上接头1下端螺纹连接，分离器短节7下端与下接头10上端螺纹连接；所述的下接头10内设置排砂筒17，排砂筒17内有排砂通道18，排砂通道18内口19连接分离器6中的排砂管16，外端的排出口20用于连接泥砂回填的输砂装置，下接头10上端与分离器短节7的下端螺纹连接，下接头10下端与其它工具螺纹连接。所述的分离器6设置在分离器短节7的内管4中，分离器6中的溢流管2设置外螺纹与螺旋稳流锥3螺纹孔A21连接，分离器6中的排砂管16下端设置外螺纹与排砂通道18内口19连接；所述的上接头1、分离器短节7和下接头10的环空为海底天然气水合物开采的进液通道，分离器短节7和下接头10的内腔为混合浆体的返液通道，上接头1的内腔为水合物浆体的返液通道。The structure of a natural gas hydrate downhole separation device with a vortex generator of the present invention is shown in Figures 1 to 12, including an upper joint 1, a separator nipple 7, a spiral stabilizing cone 3, a separator 6, and a lower joint 10 The upper end of the upper joint 1 is threaded with other tools, and the lower end of the upper joint 1 is threaded with the upper end of the separator nipple 7; the separator nipple 7 is divided into an inner pipe 4 and an outer pipe 11, and the inner pipe 4 The upper part of the inner tube is provided with a spiral stabilizing cone 3 for fluid steering and flow stabilization, an upper fixed plate 5 for fixing the straight cylinder 13 is provided, and an upper fixed cylinder 12 for pressing the upper fixed plate 5 is arranged; the lower part of the inner tube 4 is provided with The lower fixed plate 8 for fixing the cone barrel 14, the lower fixed barrel 15 for pressing the lower fixed plate 8 is set, the lower hanging head 9 for fixing the lower fixed barrel 15 and the sand discharge pipe 16 is set; the separator nipple The upper end of 7 is threadedly connected with the lower end of upper joint 1, and the lower end of separator puppet 7 is threadedly connected with the upper end of lower joint 10; the lower joint 10 is provided with a sand discharge cylinder 17, and there is a sand discharge channel 18 in the sand discharge cylinder 17. The inner port 19 of the channel 18 is connected to the sand discharge pipe 16 in the separator 6, and the discharge port 20 at the outer end is used to connect the sand conveying device for mud and sand backfilling. Threaded connection with other tools. The separator 6 is arranged in the inner pipe 4 of the separator nipple 7, the overflow pipe 2 in the separator 6 is provided with an external thread and connected with the threaded hole A21 of the spiral stabilizing cone 3, and the sand discharge pipe in the separator 6 The lower end of 16 is provided with an external thread to connect with the inner port 19 of the sand discharge channel 18; the annular space of the upper joint 1, the separator sub-section 7 and the lower sub-joint 10 is the liquid inlet channel for the exploitation of subsea natural gas hydrate, and the separator sub-section 7 The inner cavity of the lower joint 10 is the liquid return channel of the mixed slurry, and the inner cavity of the upper joint 1 is the liquid return channel of the hydrate slurry.
进一步的技术方案中，所述的上接头1为双层结构，包括内接头A22和外接头A23，内接头A22和外接头A23依靠肋板A24连接，内接头A22的上端设置外螺纹，外接头A23的上端设置外螺纹，上接头1上端与其它工具螺纹连接，内接头A22的下端设置内螺纹，外接头A23的下端设置内螺纹，上接头1下端与分离器短节7的上端螺纹连接；上接头1的环空为海底天然气水合物开采的进液通道，上接头1的内腔为水合物浆体的返液通道。In a further technical solution, the upper joint 1 has a double-layer structure, including an inner joint A22 and an outer joint A23, the inner joint A22 and the outer joint A23 are connected by ribs A24, the upper end of the inner joint A22 is provided with external threads, and the outer joint A22 The upper end of A23 is provided with an external thread, the upper end of the upper joint 1 is threadedly connected with other tools, the lower end of the inner joint A22 is provided with an internal thread, the lower end of the outer joint A23 is provided with an internal thread, and the lower end of the upper joint 1 is threaded with the upper end of the separator nipple 7; The annular space of the upper joint 1 is the liquid inlet channel for the exploitation of seabed natural gas hydrate, and the inner cavity of the upper joint 1 is the return liquid channel of the hydrate slurry.
进一步的技术方案中，所述的分离器短节7包括内管4和外管11，内管4的上端设置外螺纹与上接头1的内接头A22的下端连接，外管11的上端设置外螺纹与上接头1的外接头A23的下端连接，内管4的下端设置外螺纹与下接头10的内接头B25的上端连接，外管11的下端设置外螺纹与下接头10的外接头B26的上端连接；分离器短节7的环空为海底天然气水合物开采的进液通道，内管4的内腔为混合浆体的返液通道。In a further technical solution, the separator nipple 7 includes an inner pipe 4 and an outer pipe 11, the upper end of the inner pipe 4 is provided with an external thread to connect with the lower end of the inner joint A22 of the upper joint 1, and the upper end of the outer pipe 11 is provided with an outer thread. The thread is connected to the lower end of the outer joint A23 of the upper joint 1, the lower end of the inner pipe 4 is provided with an external thread to connect with the upper end of the inner joint B25 of the lower joint 10, and the lower end of the outer tube 11 is provided with an external thread and the outer joint B26 of the lower joint 10. The upper end is connected; the annular space of the separator nipple 7 is the liquid inlet channel for the exploitation of seabed natural gas hydrate, and the inner cavity of the inner pipe 4 is the liquid return channel for the mixed slurry.
进一步的技术方案中，所述的内管4为双头凹形孔结构，内管4上部凹形孔内嵌上固定盘5，上固定盘5上端是用于轴向定位上固定盘5的上固定筒12，上固定筒12上端是用于限制上固定筒12轴向移动的螺旋稳流锥3；内管4下部凹形孔内嵌下固定盘8，下固定盘8下端是用于轴向定位下固定盘8的下固定筒15，下固定筒15下端是用于限制下固定筒15轴向移动的下挂头9。In a further technical solution, the inner tube 4 is a double-headed concave hole structure, the upper fixed disc 5 is embedded in the upper concave hole of the inner tube 4, and the upper end of the upper fixed disc 5 is used for axially positioning the upper fixed disc 5. The upper fixed cylinder 12, the upper end of the upper fixed cylinder 12 is a spiral steady flow cone 3 used to limit the axial movement of the upper fixed cylinder 12; the lower fixed disk 8 is embedded in the concave hole at the bottom of the inner tube 4, and the lower end of the lower fixed disk 8 is The lower fixed cylinder 15 for axially positioning the lower fixed disk 8, the lower end of the lower fixed cylinder 15 is the lower hanging head 9 for limiting the axial movement of the lower fixed cylinder 15.
进一步的技术方案中，所述的螺旋稳流锥3包括端帽28和螺旋锥29，螺旋稳流锥3设置在分离器短节7的内管4中，螺旋稳流锥3的入口设置在分离器6与内管4之间的环空，流体经过螺旋稳流锥3的端帽28实现180度流向变化，通过螺旋锥29进入到螺旋叶片30。In a further technical solution, the spiral stabilizing cone 3 includes an end cap 28 and a spiral cone 29, the spiral stabilizing cone 3 is arranged in the inner pipe 4 of the separator nipple 7, and the inlet of the spiral stabilizing cone 3 is arranged at In the annular space between the separator 6 and the inner pipe 4 , the fluid passes through the end cap 28 of the spiral stabilizing cone 3 to achieve a 180-degree flow direction change, and enters the spiral blade 30 through the spiral cone 29 .
进一步的技术方案中，所述的端帽28外端设有外螺纹，外形为环形半球帽状；螺旋锥29设置在螺旋叶片30的入口，呈螺旋线形与螺旋叶片30配合，锥段直径由上到下逐渐增大，能够缓解来液冲击并稳定流场；螺旋稳流锥3的中心设有螺纹孔A21，与溢流管2螺纹连接。In a further technical solution, the outer end of the end cap 28 is provided with an external thread, and its shape is in the shape of an annular hemispherical cap; the spiral cone 29 is arranged at the entrance of the spiral blade 30, and cooperates with the spiral blade 30 in a helical shape, and the diameter of the cone section is determined by It gradually increases from top to bottom, which can alleviate the impact of incoming liquid and stabilize the flow field; the center of the spiral stabilization cone 3 is provided with a threaded hole A21, which is threadedly connected with the overflow pipe 2.
进一步的技术方案中，所述的上固定盘5中心设置用于套牢分离器6直筒段13的固定孔A31，上固定盘5中固定孔A31与外环A32之间设置有四个辐条A33连接，辐条A33之间的通孔为混合浆体的返液通道；所述的下固定盘8中心设置用于套牢分离器6的锥筒段14的固定孔B34，下固定盘8中固定孔B34与外环B35之间设置有四个辐条B36连接，辐条B36之间的通孔为混合浆体的返液通道；所述的下挂头9中心设置螺纹孔B37，下挂头9螺纹孔B37与分离器6中的排砂管16上部的外螺纹连接，螺纹孔B37四周设置四个用于混合浆体返液的通孔38，下挂头9与内管4的下端螺纹连接。In a further technical solution, the center of the upper fixing disc 5 is provided with a fixing hole A31 for fastening the straight section 13 of the separator 6, and four spokes A33 are arranged between the fixing hole A31 and the outer ring A32 in the upper fixing disc 5 to connect , the through hole between the spokes A33 is the liquid return channel of the mixed slurry; the center of the lower fixed plate 8 is provided with the fixed hole B34 for the cone section 14 of the separator 6, and the fixed hole B34 in the lower fixed plate 8 There are four spokes B36 connected to the outer ring B35, and the through holes between the spokes B36 are the liquid return channels for the mixed slurry; the center of the lower hanging head 9 is provided with a threaded hole B37, and the threaded hole B37 of the lower hanging head 9 It is connected with the external thread on the upper part of the sand discharge pipe 16 in the separator 6, and four through holes 38 for returning liquid of the mixed slurry are arranged around the threaded hole B37, and the lower hanging head 9 is threaded with the lower end of the inner pipe 4.
进一步的技术方案中，所述的分离器6设置在分离器短节7的内管4中，分离器6分为螺旋段39和旋流段40，螺旋段39对混合浆体进行螺旋导流和预分离作用，旋流段40对混合浆体进行旋流分离；分离器6设置在螺旋稳流锥3的下端，分离器6中的溢流管2设置外螺纹与螺旋锥29中的螺纹孔A21螺纹连接，分离器6中的排砂管16下端设置外螺纹与排砂通道18内口19连接。In a further technical solution, the separator 6 is arranged in the inner pipe 4 of the separator nipple 7, and the separator 6 is divided into a helical section 39 and a swirl section 40, and the helical section 39 conducts helical guidance to the mixed slurry and pre-separation effect, the swirl section 40 carries out swirl separation to the mixed slurry; the separator 6 is arranged at the lower end of the spiral stabilizing cone 3, and the overflow pipe 2 in the separator 6 is provided with an external thread and a screw thread in the spiral cone 29 The hole A21 is threaded, and the lower end of the sand discharge pipe 16 in the separator 6 is provided with an external thread to connect with the inner port 19 of the sand discharge channel 18 .
进一步的技术方案中，所述的下接头10为双层结构，包括内接头B25和外接头B26，内接头B25和外接头B26依靠排砂筒17和肋板B27连接；内接头B25的上端设置内螺纹与分离器短节7中内管4的下端连接，外接头B26的上端设置内螺纹与分离器短节7外管的下端连接，内接头B25的下端设置外螺纹，外接头B26的下端设置外螺纹，下接头10下端与其它工具螺纹连接；排砂筒17内有排砂通道18，排砂通道18内口19设置内螺纹连接排砂管16，外端的排出口20用于连接泥砂回填的输砂装置；下接头10的环空为海底天然气水合物开采的进液通道，下接头10的内腔为混合浆体的返液通道。In a further technical solution, the lower joint 10 has a double-layer structure, including an inner joint B25 and an outer joint B26, and the inner joint B25 and the outer joint B26 are connected by means of the sand discharge cylinder 17 and the rib B27; the upper end of the inner joint B25 is set The internal thread is connected to the lower end of the inner pipe 4 in the separator nipple 7, the upper end of the outer joint B26 is provided with an inner thread to connect with the lower end of the outer pipe of the separator nipple 7, the lower end of the inner joint B25 is provided with an outer thread, and the lower end of the outer joint B26 The outer thread is provided, and the lower end of the lower joint 10 is threadedly connected with other tools; there is a sand discharge channel 18 in the sand discharge tube 17, and the inner port 19 of the sand discharge channel 18 is provided with an internal thread to connect the sand discharge pipe 16, and the discharge port 20 at the outer end is used to connect mud and sand Backfilled sand delivery device; the annular space of the lower joint 10 is the liquid inlet channel for the exploitation of seabed natural gas hydrate, and the inner cavity of the lower joint 10 is the liquid return channel for the mixed slurry.
本发明的工作原理：固态流化开采海底天然气水合物时，需要引入高压海水进行射流破碎水合物层，上接头1环空、分离器短节7环空、下接头10环空组成的环空通道为高压海水的进液通道；在射流破碎之后，井下收集混合浆体，混合浆体在举升泵的作用下到达井下分离装置的下接头10，混合浆体从下接头10的内腔进入分离器短节7中内管4的内腔，然后依次通过下挂头9的通孔38、下固定盘8的通孔、上固定盘5的通孔到达螺旋稳流锥3，在螺旋稳流锥3的转向和稳流作用下进入螺旋段39，在螺旋段39的强制导流作用下，泥砂逐渐向外侧扩散，水合物颗粒向中心靠拢，实现混合浆体的预分离，然后混合浆体进入旋流段40进行旋流分离，分离出的泥砂从排砂管16排出，最终从排砂通道18回填到井底，分离出的水合物浆体从溢流管2向上流入上接头1的内腔，最后返排到海洋平台进行后期处理。The working principle of the present invention: when exploiting seabed natural gas hydrate by solid fluidization, it is necessary to introduce high-pressure seawater to break the hydrate layer by jet flow, the annulus composed of the upper joint 1 annulus, the separator sub-joint 7 annulus, and the lower joint 10 annulus The channel is the liquid inlet channel of high-pressure seawater; after the jet is broken, the mixed slurry is collected downhole, and the mixed slurry reaches the lower joint 10 of the downhole separation device under the action of the lift pump, and the mixed slurry enters from the inner cavity of the lower joint 10 The inner cavity of the inner tube 4 in the separator nipple 7 then passes through the through hole 38 of the lower hanging head 9, the through hole of the lower fixed plate 8, and the through hole of the upper fixed plate 5 to reach the spiral steady flow cone 3, and Under the turning and steady flow of the flow cone 3, it enters the helical section 39. Under the forced diversion of the helical section 39, the mud and sand gradually spread to the outside, and the hydrate particles move closer to the center to realize the pre-separation of the mixed slurry, and then the mixed slurry The hydrate body enters the swirl section 40 for swirl separation, and the separated mud and sand are discharged from the sand discharge pipe 16, and finally backfilled to the bottom of the well from the sand discharge channel 18, and the separated hydrate slurry flows upward from the overflow pipe 2 into the upper joint 1 cavity, and finally flow back to the offshore platform for post-processing.
以上所述仅是本发明的优选实施方式，应当理解本发明并非局限于本文所披露的形式，不应看作是对其他实施例的排除，而可用于各种其他组合、修改和环境，并能够在本文所述构想范围内，通过上述教导或相关领域的技术或知识进行改动。而本领域人员所进行的改动和变化不脱离本发明的精神和范围，则都应在本发明所附权利要求的保护范围内。The above descriptions are only preferred embodiments of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and Modifications can be made within the scope of the ideas described herein, by virtue of the above teachings or skill or knowledge in the relevant art. However, changes and changes made by those skilled in the art do not depart from the spirit and scope of the present invention, and should all be within the protection scope of the appended claims of the present invention.
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| CN109406749A (en) * | 2018-11-13 | 2019-03-01 | 西南石油大学 | A kind of solid state fluidizing water jet rock breaking and recovery experiment tool in situ |
| CN109488262B (en) * | 2019-01-21 | 2021-10-08 | 常州大学 | A Sediment Cyclone Separator for Natural Gas Hydrate Exploitation |
| CN109488262A (en) * | 2019-01-21 | 2019-03-19 | 常州大学 | A kind of exploitation of gas hydrates silt cyclone separator |
| CN109882147A (en) * | 2019-03-16 | 2019-06-14 | 西南石油大学 | A large-capacity integrated hydrate downhole in-situ separation parallel device |
| CN110029982A (en) * | 2019-05-08 | 2019-07-19 | 华东理工大学 | Cementing cyclone separator is broken in rotation |
| CN113090244A (en) * | 2021-04-19 | 2021-07-09 | 华东理工大学 | Natural gas hydrate rotational flow autorotation gel breaking separation method and separation device |
| CN113090245A (en) * | 2021-04-19 | 2021-07-09 | 华东理工大学 | Underground rotational flow sorting and separating device and method for natural gas hydrate |
| CN113090244B (en) * | 2021-04-19 | 2022-02-15 | 华东理工大学 | A kind of natural gas hydrate cyclone rotation gel breaking separation method and separation device |
| WO2022222333A1 (en) * | 2021-04-19 | 2022-10-27 | 华东理工大学 | Sorting and separating device and method for natural gas hydrate underground cyclone |
| CN114687710A (en) * | 2022-03-30 | 2022-07-01 | 西南石油大学 | An underwater thermal decomposition high-efficiency separation sand removal backfill device |
| CN114687710B (en) * | 2022-03-30 | 2023-09-15 | 西南石油大学 | An underwater thermal decomposition efficient separation and sand removal backfill device |
| CN114961690A (en) * | 2022-04-21 | 2022-08-30 | 宜宾学院 | Double-layer tube type series spiral hydrate in-situ separation and desanding device |
| CN114961690B (en) * | 2022-04-21 | 2023-08-15 | 宜宾学院 | A double-layer tubular series spiral hydrate in-situ separation and desanding device |
| CN114991741A (en) * | 2022-05-16 | 2022-09-02 | 东北石油大学 | Natural gas hydrate separation device and method |
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