CN113464100B - Deep sea hydrate exploitation sand control screen pipe blocking improvement system and application method - Google Patents
Deep sea hydrate exploitation sand control screen pipe blocking improvement system and application method Download PDFInfo
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- CN113464100B CN113464100B CN202110880538.6A CN202110880538A CN113464100B CN 113464100 B CN113464100 B CN 113464100B CN 202110880538 A CN202110880538 A CN 202110880538A CN 113464100 B CN113464100 B CN 113464100B
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- 239000004576 sand Substances 0.000 title claims abstract description 58
- 230000006872 improvement Effects 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000000903 blocking effect Effects 0.000 title description 2
- 238000005553 drilling Methods 0.000 claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 claims description 37
- 239000013535 sea water Substances 0.000 claims description 28
- 230000007246 mechanism Effects 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 9
- 238000000605 extraction Methods 0.000 claims description 8
- 238000005086 pumping Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 7
- 238000012856 packing Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 238000011010 flushing procedure Methods 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000007667 floating Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Natural products C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 37
- 239000007789 gas Substances 0.000 description 29
- 239000003345 natural gas Substances 0.000 description 17
- 230000005540 biological transmission Effects 0.000 description 10
- 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 description 8
- 239000007788 liquid Substances 0.000 description 4
- 238000005457 optimization Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- -1 Natural gas hydrates Chemical class 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
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- 239000013049 sediment Substances 0.000 description 1
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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
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
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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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/08—Methods or apparatus for cleaning boreholes or wells cleaning in situ of down-hole filters, screens, e.g. casing perforations, or gravel packs
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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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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
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- Earth Drilling (AREA)
Abstract
The invention discloses a deep sea hydrate exploitation sand control screen pipe blockage improving system and an application method, wherein the system comprises the following steps: the sand control screen pipe comprises drilling equipment and a sand control screen pipe which is detachably connected with the drilling equipment; the sand control screen pipe comprises a central cylinder, a plurality of guide pressurizing blades, an outer sleeve and an exhaust hole, wherein gravel is pre-filled in the outer sleeve; the guide supercharging blades are fixedly arranged on the outer side surface of the central cylinder at equal intervals; the central cylinder is arranged in the gravel pre-filling outer sleeve; the diversion supercharging blade is arranged between the outer wall of the central cylinder and the inner wall of the gravel pre-filling outer sleeve; a plurality of rows of exhaust holes are formed in the outer side surface of the gravel pre-filling outer sleeve at equal intervals, and the gravel pre-filling outer sleeve is fixedly connected with drilling equipment; the inner cavity of the gravel pre-filling outer sleeve is filled with a plurality of gravels. The invention realizes the treatment and improvement of the quicksand blockage in the deep sea hydrate exploitation and reduces the maintenance cost of deep sea drilling.
Description
Technical Field
The invention relates to the technical field of drilling equipment, in particular to a deep sea hydrate exploitation sand control screen pipe plugging improvement system and an application method.
Background
Natural gas hydrates are ice-like, non-stoichiometric, clathrate crystalline compounds formed from water and natural gas under high pressure and low temperature conditions. Natural gas hydrate is a clean energy source and is known as a new energy source in the 21 st century. Among them, the energy density of methane (volume of methane per unit volume of rock under standard conditions) is very large, 10 times that of coal and black shale, 2.5 times that of natural gas.
Natural gas hydrates are widely distributed in nature in continents, sloping terrain in islands, elevations at the edges of active and passive continents, polar continental shelves, and the deepwater environment of the ocean and some inland lakes. Formation conditions of natural gas hydrate: low temperature, generally below 10 ℃; high pressure, generally higher than 10MPa; abundant natural gas (hydrocarbons, predominantly methane) gas sources; favorable hydrate occurrence space. The gas sources for natural gas hydrate formation are mainly: the organic matter in the deep part is heated and decomposed to generate gas and moves upwards; gas generated by degrading organic matters in the sediment through microorganisms; volcanic action generated gases; the atmosphere dissolves. According to the analysis and detection of the above conditions, natural gas hydrates are mainly distributed on high-latitude lands (permafrost zones) and on the sea bottom. According to statistics, 90% of sea areas contain natural gas hydrate, and land slopes, land ridges, basins and parts of inland seas distributed in the edge sea areas of various oceans can be enriched on the surface of the sea bottom in special environments.
The method for recovering the natural gas from the natural gas hydrate sedimentary layer can reduce the strength of the seabed sedimentary layer, promote sand grains in the stratum around the production well to be activated and enter the production well along with fluid, so that the production well is blocked, the production efficiency of the deep sea natural gas hydrate is seriously restricted, the production cost is increased, and the commercialization process of the deep sea natural gas hydrate is influenced. How to solve the problems of sand production of a well casing and treatment of the sand production in the hydrate exploitation process needs to fully consider special conditions of occurrence of deep sea natural gas hydrate, and therefore, a deep sea hydrate exploitation sand control screen pipe plugging improvement system and an application method need to be designed urgently to solve the problems.
Disclosure of Invention
The invention aims to provide a deep sea hydrate exploitation sand control screen pipe plugging improvement system and an application method, and aims to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a deep sea hydrate exploitation sand control screen pipe plugging improvement system which is characterized by comprising the following components in parts by weight: the sand control screen pipe comprises drilling equipment and a sand control screen pipe which is detachably connected with the drilling equipment;
the sand control screen pipe comprises a central cylinder, a plurality of guide pressurizing blades, an outer sleeve and an exhaust hole, wherein gravel is pre-filled; the guide supercharging blades are fixedly arranged on the outer side surface of the central cylinder at equal intervals; the central cylinder is arranged in the gravel pre-packing outer sleeve; the guide pressurizing blades are arranged between the outer wall of the central cylinder and the inner wall of the gravel pre-filling outer sleeve; a plurality of vent holes are formed in the outer side surface of the gravel pre-filling outer sleeve at equal intervals, and the gravel pre-filling outer sleeve is fixedly connected with the drilling equipment; the inner cavity of the gravel pre-filling outer sleeve is filled with a plurality of gravels.
Preferably, the guide pressurizing blades are of a straight plate structure, the guide pressurizing blades are vertically arranged along the circumferential direction of the outer side surface of the central cylinder at equal intervals, and the guide pressurizing blades are of a structure which is narrow at the top and wide at the bottom.
Preferably, one side face, far away from the central cylinder, of the guide pressurizing blade is fixedly connected with the inner side face of the gravel pre-filling outer sleeve.
Preferably, the diameter of the vent hole is smaller than that of the gravel, and the vent hole is circumferentially arranged along the outer side surface of the gravel pre-filling outer sleeve.
Preferably, the gravel is pre-selected natural sand having a particular size grading.
Preferably, the pre-selected gravel having a specific size grading is an artificial particle.
Preferably, the drilling apparatus comprises a drilling platform; the drilling platform is arranged on the sea surface of seawater in a floating manner; the drilling platform is matched with a gas collecting pipe; a shaft and an air exhaust mechanism are arranged on the bottom end face of the gas collecting pipe; the sea surface is provided with a production well; the shaft is fixedly arranged on the inner wall of the production well; the air exhaust mechanism is fixedly connected and communicated with the gravel pre-filling outer sleeve.
Preferably, the pumping mechanism comprises a pumping tube disposed within the wellbore; a sleeve is sleeved on the outer side surface of the exhaust tube; the top end of the exhaust pipe is fixedly connected and communicated with the bottom end face of the gas collecting pipe, and the side face of the bottom end of the gas collecting pipe is fixedly connected with a sealing cover; the sealing cover is fixedly connected with the top end of the shaft; the bottom end of the exhaust pipe is fixedly connected and communicated with a packer; the packer is in threaded connection with the top end of the gravel pre-filling outer sleeve; the bottom end of the gravel pre-filling outer sleeve is in threaded connection with another packer; the gravel pre-filling outer sleeve is communicated with the air suction pipe through the packer.
Preferably, the bottom end face of the wellbore is flush with the top end face of the gravel pre-pack outer sleeve.
An application method of a deep sea hydrate exploitation sand control screen pipe plugging improvement system comprises the following steps:
installation: sealingly communicating the sand control screen with the drilling apparatus;
placing: the connected sand control screen pipe is put to the bottom of a production well through the extraction pipe;
water injection: when the holes among the gravels in the gravel pre-filling outer sleeve are blocked, injecting seawater into the exhaust pipe from the drilling platform;
washing: and flushing the holes among the gravels in the gravel prepacked outer sleeve by using high-speed seawater.
The invention discloses the following technical effects:
by adopting the deep sea hydrate exploitation sand prevention pipe, the influence of sand production on exploitation efficiency in the deep sea hydrate exploitation process can be effectively solved. The invention has simple structure and low processing cost, fully utilizes the characteristic of large occurrence depth of the deep sea hydrate, uses local materials, utilizes the conversion of seawater energy near the sea surface and combines the diversion pressurizing blades to further increase the speed of the seawater, dredges gravel holes inside the blocked sand prevention pipe under the action of high-speed water flow, and has wide practicability in the technical field.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a schematic front view of the present invention.
FIG. 2 is a schematic diagram of a side view of a sand screen.
Fig. 3 is a side view schematically showing the structure of the center cylinder.
Fig. 4 is a schematic front view of the structure of embodiment 2.
Wherein, 1-a drilling platform; 2-a gas collecting pipe; 3-a wellbore; 4-sleeving a sleeve; 5-an exhaust pipe; 6-a packer; 7-sand control screen pipe; 9-seawater; 10-sea floor; 11-hydrate reservoir; 12-axial turbine blades; 13-a transmission rod; 701-a central barrel; 702-guide pressurizing vanes; 703-gravel pre-packing the outer sleeve; 704-Vent hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The invention provides a deep sea hydrate exploitation sand control screen pipe plugging improvement system which is characterized by comprising the following components in parts by weight: the drilling equipment and the sand control screen pipe 7 which is detachably connected with the drilling equipment;
the sand control screen pipe 7 comprises a central cylinder 701, a plurality of guide pressurizing blades 702, a gravel pre-filling outer sleeve 703 and an exhaust hole 704; the guide supercharging blades 702 are fixedly arranged on the outer side surface of the central cylinder 701 at equal intervals; center barrel 701 is disposed within gravel pre-pack outer sleeve 703; the guide pressurizing blades 702 are arranged between the outer wall of the central cylinder 701 and the inner wall of the gravel pre-filling outer sleeve 703; a plurality of vent holes are formed in the outer side surface of the gravel pre-filling outer sleeve 703 at equal intervals, and the gravel pre-filling outer sleeve 703 is fixedly connected with drilling equipment; the inner cavity of gravel pre-packing outer sleeve 703 is filled with a quantity of gravel.
According to a further optimization scheme, the guide pressurizing blades 702 are of a straight plate structure, the guide pressurizing blades 702 are vertically arranged along the circumferential direction of the outer side surface of the central cylinder 701 at equal intervals, and the guide pressurizing blades 702 are integrally of a structure with a narrow upper part and a wide lower part.
Further, the guide pressurizing blade 702 is of a vertical plate structure, so that when the seawater is washed, the seawater 9 flowing down from the exhaust pipe 5 impacts gravel without hindrance, meanwhile, one side face, far away from the central cylinder 701, of the guide pressurizing blade 702 is set to be in a shape with a narrow top and a wide bottom, namely, the side faces of the guide pressurizing blade 702 are opposite, the shape is in a streamline shape with a narrow top and a wide bottom, so that the space between the two adjacent guide pressurizing blades 702 is in a descending state from top to bottom, and the impact speed of the washed seawater 9 can be further increased. Meanwhile, the opposite side surfaces of the adjacent guide and pressurizing blades 702 are cambered surfaces, the opposite side surfaces of the adjacent guide and pressurizing blades 702 of the seawater 9 impact the bottom of the adjacent guide and pressurizing blades, and then vortex flows are formed, so that the convolution force of the seawater 9 can be increased due to the generation of the vortex flows, and the sand blocked among the gravels can be quickly dispersed and brought out of the gravel pre-filled outer sleeve 703 by the seawater 9.
In a further optimization scheme, one side surface of the guide pressurizing blade 702 far away from the central cylinder 701 is fixedly connected with the inner side surface of the gravel pre-filling outer sleeve 703.
In a further optimization scheme, the diameter of the vent hole is smaller than that of gravel, and the vent hole is circumferentially arranged along the outer side surface of the gravel pre-filling outer sleeve 703.
Furthermore, the exhaust holes are circumferentially formed in a plurality of layers along the outer side surface of the gravel pre-filling outer sleeve 703, and the adjacent two layers of exhaust holes are arranged in a staggered mode, so that the problem that the washing dead angle is formed when the seawater 9 is washed back is avoided, the washing is not thorough, and the working efficiency is influenced.
In a further preferred embodiment, the gravel is pre-selected natural sand of a particular size distribution.
In a further optimization scheme, the preselected gravel with specific size grading is artificial particles.
Furthermore, the gravels with specific size fraction size grading are artificial particles, namely the gravels with specific size fraction size grading in a preselected range are processed and treated to a preset diameter by using a manual means, and particularly when the particle size of the reservoir gravel is 0.04mm-1mm, the gravel grading D50 is 0.23mm-5mm, the gravel grading can effectively prevent the entry and depth of the reservoir gravel, and the maintenance frequency is reduced.
In a further preferred embodiment, the drilling installation comprises a drilling platform 1; the drilling platform 1 is arranged on the sea surface of seawater 9 in a floating manner; the drilling platform 1 is matched with a gas collecting pipe 2; the bottom end face of the gas collecting pipe 2 is provided with a shaft 3 and an air pumping mechanism; the sea surface 10 is provided with a production well; the shaft 3 is fixedly arranged on the inner wall of the production well; the air pumping mechanism is fixedly connected and communicated with the gravel pre-filling outer sleeve 703.
Furthermore, the sea surface 10 is provided with a production well, the production well directly leads to the hydrate reservoir 11 at the bottom of the sea surface, and the well wall of the production well is fixedly connected with the shaft 3, so that the support of the production well is realized, and the collapse of the production well caused by geological reasons is avoided.
In a further optimized scheme, the air exhaust mechanism comprises an air exhaust pipe 5 arranged in the shaft 3; the outer side surface of the exhaust tube 5 is sleeved with a sleeve 4; the top end of the exhaust pipe 5 is fixedly connected and communicated with the bottom end face of the gas collecting pipe 2, and the side face of the bottom end of the gas collecting pipe 2 is fixedly connected with a sealing cover; the sealing cover is fixedly connected with the top end of the shaft 3; the bottom end of the exhaust pipe 5 is fixedly connected and communicated with a packer 6; the packer 6 is in threaded connection with the top end of the gravel prepack outer sleeve 703; the bottom end of the gravel pre-filling outer sleeve 703 is screwed with another packer 6; gravel pre-pack outer sleeve 703 is in communication with aspiration tube 5 through packer 6.
Furthermore, the sealing cover is fixedly connected with the top end of the shaft 3 and is arranged in a sealing manner, so that the seawater 9 is prevented from permeating into the shaft 3.
Further, a through hole is formed in the center of a packer 6 which is screwed at the top end of the gravel pre-filling outer sleeve 703, and the exhaust pipe 5 is communicated with the gravel pre-filling outer sleeve 703 through the through hole, so that the natural gas is smoothly conveyed from the gravel pre-filling outer sleeve 703 to the exhaust pipe 5.
In a further preferred embodiment, the bottom end face of the wellbore 3 is flush with the top end face of the gravel pre-pack outer sleeve 703.
Furthermore, the top end face of the shaft 3 is flush with the wellhead of the production well, so that the support for the production well is realized, a path is provided for the development of the hydrate reservoir stratum 11 at the bottom layer, and the natural gas is convenient to extract.
An application method of a deep sea hydrate exploitation sand control screen pipe plugging improvement system comprises the following steps:
installation: the sand control screen pipe 7 is communicated with the drilling equipment in a sealing way;
placing: the well-connected sand control screen pipe 7 is lowered to the bottom of the production well through the exhaust pipe 5;
water injection: when the holes among the gravels in the gravel pre-filling outer sleeve 703 are blocked, injecting seawater 9 into the exhaust pipe 5 from the drilling platform 1;
washing: the gravel pack voids between the gravel in outer sleeve 703 are flushed with high velocity seawater 9.
Further, the installation means that the sand control screen pipe 7 is connected with the extraction pipe 5 of the production well through the thread on the outer side of the gravel pre-filling outer sleeve 703 and the packer 6;
the lowering is to place the extraction pipe 5 connected with the sand control screen pipe 7 to the hydrate reservoir 11 at the bottom of the production well along the production well;
the water injection is that when fine sand grains of the hydrate reservoir 11 block the holes among the gravels in the gravel pre-filling outer sleeve 703 in the production process, seawater 9 is injected into the exhaust pipe 5 from the drilling platform 1;
the flushing is that the seawater 9 reaches the sand control screen 7 from the drilling platform 1 along the exhaust pipe 5, at this time, the huge potential energy of the seawater is converted into kinetic energy, and simultaneously, under the action of the diversion pressurizing blades 702, the high-speed seawater is used for strongly flushing and dredging the pores among the gravels in the blocked gravel pre-filling outer sleeve 703, and the pores are flushed to the outside from the inside of the gravel pre-filling outer sleeve 703 along the exhaust holes 704.
Example 1
On the well drilling platform 1 which is well built, the sand control screen pipe 7 is connected with the extraction pipe 5 of the production well through the thread on the outer side of the gravel pre-filling outer sleeve 703 and the packer 6, the packer 6 prevents substances on the seabed from entering a pipeline, and the collected gas is prevented from being dissipated into seawater 9; after the installation is finished, the pumping pipe 5 is placed to the hydrate reservoir 11 at the bottom of the exploitation well along the exploitation well through the drilling platform 1; in the process, the top end of the exhaust pipe 5 is fixedly connected and communicated with the bottom end of the gas collecting pipe 2, so that the whole gas is connected in place, natural gas resources contained in the hydrate reservoir 11 enter the gravel pre-filling outer sleeve 703 through the exhaust hole 704, and are further sent into the gas collecting pipe 2 through the exhaust pipe 5 and finally sent to the drilling platform 1 for collection and utilization.
When natural gas resources in the hydrate reservoir 11 are continuously sent out through the sand control screen 7, sand grains in the stratum of the hydrate reservoir 11 are activated and enter a production well along with fluid through the air exhaust holes 704, and then a plurality of gravel gaps in the sand control screen 7 are blocked, at the moment, seawater 9 is injected into the gas collecting pipe 2 and the air exhaust pipe 5, the seawater is accelerated through long-distance fall and impacts the sand control screen 7 at the bottom, and the seawater 9 under impact is severely disturbed to form vortex through the diversion and pressurization of the diversion and pressurization blades 702, the vortex is convoluted with the blocked sand grains, and the sand grains are flushed to the outer side of the sand control screen 7 through the air exhaust holes 704.
Example 2
An axial flow turbine blade 12 is also arranged in the exhaust pipe 5; the center of the axial flow turbine blade 12 is detachably connected with a transmission rod 13, and the top of the transmission rod 13 is in transmission connection with an external power device (not shown in the drawing); the axial-flow turbine fan blade 12 is arranged at the bottom end of the exhaust pipe 5 and close to the packer 6;
when the air pressure in the air well is large, the axial flow turbine fan blade 12 needs to be placed at the bottom end of the air exhaust pipe 5 through the transmission rod 13, power transmission is not provided, natural gas in the air well passes through the axial flow turbine fan blade 12 at the highest speed, the axial flow turbine fan blade 12 can be pushed to rotate at the high speed, the natural gas passing through the axial flow turbine fan blade 12 can be rectified from original unstable direct current to be vortex, the unstable direct current of the natural gas can cause low natural gas transmission efficiency, the natural gas can rotate to form airflow after being rectified into the vortex, the generation of internal turbulence is reduced, the consumption of the air pressure is reduced, and the air transmission efficiency is improved;
along with the development of exploitation, liquid such as free water, hydrocarbon condensate night liquid and condensate water in the stratum can enter a shaft to form shaft liquid or gas well liquid, so that the pressure difference between a well head and the bottom of the well is sharply reduced, the produced gas cannot flow to the well head, the yield of the gas well is rapidly reduced, at the moment, the axial flow turbine fan blade 12 needs to be lifted out and placed on the top of the gas collecting pipe 2 through the transmission rod 13, at the moment, an external power device provides power for the transmission rod 13, the axial flow turbine fan blade 12 is actively rotated at a high speed, the air pressure at the pipe opening of the gas collecting pipe 2 is reduced, the air pressure difference between the bottom of the gas well and the pipe opening of the gas collecting pipe 2 is also improved, the gas outlet efficiency of natural gas is improved, and the extraction rate of residual gas in the gas well is improved.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (8)
1. The utility model provides a deep sea hydrate exploitation sand control screen pipe stifled pipe improves system which characterized in that includes: drilling equipment and a sand control screen (7) detachably connected with the drilling equipment;
the sand control screen pipe (7) comprises a central cylinder (701), a plurality of guide pressurizing blades (702), a gravel pre-packed outer sleeve (703) and an exhaust hole (704); the guide supercharging blades (702) are fixedly arranged on the outer side surface of the central cylinder (701) at equal intervals; the central barrel (701) is disposed within the gravel pre-pack outer sleeve (703); the guide pressurizing blade (702) is arranged between the outer wall of the central cylinder (701) and the inner wall of the gravel pre-filling outer sleeve (703); a plurality of vent holes are formed in the outer side surface of the gravel pre-filling outer sleeve (703) at equal intervals, and the gravel pre-filling outer sleeve (703) is fixedly connected with the drilling equipment; the inner cavity of the gravel pre-filling outer sleeve (703) is filled with a plurality of gravels;
the guide pressurizing blades (702) are of a straight plate structure, the guide pressurizing blades (702) are vertically arranged along the outer side surface of the central cylinder (701) in the circumferential direction at equal intervals, and the guide pressurizing blades (702) are of a structure with a narrow upper part and a wide lower part;
one side surface of the guide pressurizing blade (702) far away from the central cylinder (701) is fixedly connected with the inner side surface of the gravel pre-filling outer sleeve (703).
2. The deep sea hydrate production sand control screen plugging improvement system of claim 1, wherein: the diameter of the vent hole is smaller than that of the gravel, and the vent hole is circumferentially arranged along the outer side surface of the gravel pre-filling outer sleeve (703).
3. The deep sea hydrate production sand control screen plugging improvement system of claim 1, wherein: the gravel is pre-selected natural sand with a specific size grading.
4. The deep sea hydrate production sand control screen plugging improvement system of claim 3, wherein: the pre-selected gravel having a specific size grading is an artificial particle.
5. The deep sea hydrate production sand control screen plugging improvement system of claim 1, wherein: the drilling installation comprises a drilling platform (1); the drilling platform (1) is arranged on the sea surface of seawater (9) in a floating manner; the drilling platform (1) is matched with a gas collecting pipe (2); the bottom end surface of the gas collecting pipe (2) is respectively provided with a shaft (3) and an air pumping mechanism; the sea surface (10) is provided with a production well; the shaft (3) is fixedly arranged on the inner wall of the production well; the air exhaust mechanism is fixedly connected and communicated with the gravel pre-filling outer sleeve (703).
6. The deep sea hydrate production sand control screen plugging improvement system according to claim 5, wherein: the air pumping mechanism comprises an air pumping pipe (5) arranged in the shaft (3); a sleeve (4) is sleeved on the outer side surface of the air exhaust pipe (5); the top end of the exhaust pipe (5) is fixedly connected and communicated with the bottom end face of the gas collecting pipe (2), and the side face of the bottom end of the gas collecting pipe (2) is fixedly connected with a sealing cover; the sealing cover is fixedly connected with the top end of the shaft (3); the bottom end of the extraction pipe (5) is fixedly connected and communicated with a packer (6); the packer (6) is in threaded connection with the top end of the gravel pre-packing outer sleeve (703); the bottom end of the gravel pre-filling outer sleeve (703) is screwed with another packer (6); the gravel pre-packing outer sleeve (703) is communicated with the air suction pipe (5) through the packer (6).
7. The deep sea hydrate production sand control screen plugging improvement system according to claim 5, wherein: the bottom end face of the well bore (3) is flush with the top end face of the gravel pre-packing outer sleeve (703).
8. The method for applying the deep sea hydrate production sand screen plugging improvement system according to claim 6, wherein the method comprises the following steps:
installation: sealingly communicating the sand control screen (7) with the drilling apparatus;
placing: the connected sand control screen pipe (7) is lowered to the bottom of the production well through the extraction pipe (5);
water injection: injecting seawater (9) from the rig (1) into the extraction pipe (5) when the gravel pack outer sleeve (703) is plugged;
washing: and flushing the holes among the gravels in the gravel pre-packed outer sleeve (703) by using high-speed seawater (9).
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| CN114737900A (en) * | 2021-12-27 | 2022-07-12 | 核工业北京化工冶金研究院 | Static rotational flow well washing device and method for cleaning ground immersed borehole |
| CN114753807B (en) * | 2022-03-14 | 2023-07-25 | 中国海洋石油集团有限公司 | Novel sand control screen pipe for deep sea hydrate production |
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| US6634431B2 (en) * | 1998-11-16 | 2003-10-21 | Robert Lance Cook | Isolation of subterranean zones |
| US6758275B2 (en) * | 2002-08-16 | 2004-07-06 | Weatherford/Lamb, Inc. | Method of cleaning and refinishing tubulars |
| CN203547686U (en) * | 2013-11-04 | 2014-04-16 | 中国石油集团渤海钻探工程有限公司 | Integrated sand prevention pipe column |
| CN107780893A (en) * | 2016-08-25 | 2018-03-09 | 王磊 | A kind of Shallow Heavy Oil Reservoir completion tubular column |
| CN208203241U (en) * | 2018-05-16 | 2018-12-07 | 成都西南石大石油工程技术有限公司 | It is a kind of novel actively to catch sandpipe |
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| CN211851791U (en) * | 2020-01-07 | 2020-11-03 | 中国石油天然气股份有限公司 | Sand control screen pipe and oil gas tubular column |
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