CN214944182U - Natural gas hydrate reservoir sand control device - Google Patents
Natural gas hydrate reservoir sand control device Download PDFInfo
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- CN214944182U CN214944182U CN202120379824.XU CN202120379824U CN214944182U CN 214944182 U CN214944182 U CN 214944182U CN 202120379824 U CN202120379824 U CN 202120379824U CN 214944182 U CN214944182 U CN 214944182U
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Abstract
The utility model provides a natural gas hydrate reservoir sand control device, including keeping off a sand section of thick bamboo, parent tube and a plurality of sand control unit, it is the open hollow structure in top to keep off a sand section of thick bamboo and parent tube, the parent tube is located keeps off a sand section of thick bamboo, the sand control unit sets up along the lateral wall circumference of parent tube, the sand control unit includes block cap, lid and sheetmetal, block cap and lid are the open hollow cavity structures in both ends, the recess is seted up to the inboard of block cap, the sheetmetal is placed in the groove, the lid includes lid upper portion and lid lower part, block cap and lid upper portion threaded connection, the lateral wall threaded connection of lid lower part and parent tube, the sheetmetal only allows the diameter to be not more than 5 microns fine sand granule to pass through. The utility model provides a sand control device can effectively prevent the sand grain more than 5 microns.
Description
Technical Field
The utility model relates to a natural gas hydrate field especially relates to a natural gas hydrate reservoir sand control device.
Background
The trial production of the natural gas hydrate reservoir is usually accompanied by sand production, if the sand production amount is large, the production is influenced, and the sand production problem is a bottleneck for restricting the safe and efficient production of the hydrate. The prior natural gas hydrate reservoir sand control device is mainly derived from common sand control methods in conventional oil exploitation, and comprises gravel pack sand control, screen pipe sand control and the like. Compared with a conventional oil and gas reservoir, the hydrate reservoir has the characteristics of weak consolidation and high argillaceous quality, the typical argillaceous content of the hydrate reservoir in China is up to more than 25%, argillaceous fine silt with the median particle size of 10-15 microns is mainly used, due to the fact that sand grains are thin, the high precision requirement is provided for sand prevention, and the permeability is seriously reduced after the sand prevention precision is improved. Research shows that under the sand control precision of 40 microns, the permeability of the sand control medium is reduced by 90 percent, and under the sand control precision of 20 microns, the blocking permeability of the sand control medium is less than 0.12 darcy, and the circulation performance is extremely poor; hydrate reservoir decomposition will produce water, and 1 cubic meter of natural gas hydrate decomposition will produce about 0.8 cubic meter of water and 168 cubic meters of natural gas. Although the water volume is not large, extremely large capillary force and liquid dragging force are formed in a reservoir, and sand carrying and very high displacement resistance are easily caused.
The conventional sand control method for oil and gas has the following defects: firstly, the sand control precision is low, and micron-level sand control cannot be achieved; secondly, the aim of capillary seepage drainage and gas production cannot be effectively achieved while sand control is carried out.
Disclosure of Invention
In view of this, the utility model provides a can effectively prevent natural gas hydrate reservoir sand control device of sand grain more than 5 microns.
The utility model provides a natural gas hydrate reservoir sand control device, including keeping off a sand section of thick bamboo, parent tube and a plurality of sand control unit, it is the open hollow structure in top to keep off a sand section of thick bamboo and parent tube, the parent tube is located keeps off a sand section of thick bamboo, the sand control unit sets up along the lateral wall circumference of parent tube, the sand control unit includes block cap, lid and sheetmetal, block cap and lid are the open hollow cavity structures in both ends, the recess is seted up to the inboard of block cap, the sheetmetal is placed in the groove, the lid includes lid upper portion and lid lower part, block cap and lid upper portion threaded connection, the lateral wall threaded connection of lid lower part and parent tube, the sheetmetal only allows the diameter to be not more than 5 microns fine sand granule to pass through.
Furthermore, the sand control unit still includes first rubber seal, piezoceramics circle and second rubber seal, first rubber seal, sheetmetal, piezoceramics circle and second rubber seal top-down place in the recess department in proper order, piezoceramics circle establishes with the sheetmetal cover and is connected, piezoceramics circle is by the vibration of production after voltage drive, piezoceramics circle vibration drives the sheetmetal vibration.
Furthermore, a plurality of conical holes with the diameter of 5 microns are uniformly formed in the middle of the metal sheet.
Furthermore, the inner side of the cap is provided with a first thread which is positioned below the groove, and the outer side of the upper part of the cover body is provided with a second thread which is in matched connection with the first thread.
Furthermore, a plurality of circles of threaded holes are uniformly formed in the lower end of the base pipe along the side wall, third threads are arranged on the outer side of the lower portion of the cover body, and the third threads are connected with the threaded holes in a matched mode.
Further, a sand blocking medium is filled between the side wall of the base pipe and the inner wall of the sand blocking cylinder, and only fine sand particles with the diameter not larger than 20 micrometers are allowed to pass through the sand blocking medium.
Further, a drain pipe is inserted into the base pipe, and the bottom end of the drain pipe is close to the bottom end of the base pipe.
Furthermore, a plurality of through holes are formed in the side wall of the sand blocking cylinder.
The utility model provides a beneficial effect that technical scheme brought is: the utility model provides a sand control device sets up a plurality of sand control units, and the natural gas hydrate reservoir stratum flows along the flow path of reservoir stratum-sand blocking medium-sand control unit, and the coarse sand that the diameter is greater than 20 microns is blocked by sand blocking medium earlier, and the fine sand granule that directly is greater than 5 microns is blocked by the taper hole of sand control unit, can effectively prevent the sand grain of diameter more than 5 microns; the utility model provides a sand control device utilizes the vibration of piezoceramics circle to drive the sheetmetal vibration in the sand control, makes the taper hole produce complicated anomalous vibration, deformation, pump effect to and divergent/convergent motion, under this effect, hydrate reservoir fluid in the taper hole forms solitary droplet, thereby realizes discharging the water that the reservoir decomposes the production, gas and the dissolved gas of aquatic, guarantees the incessant output of natural gas hydrate reservoir natural gas.
Drawings
Figure 1 is the utility model relates to a natural gas hydrate reservoir sand control device's schematic structure diagram.
Fig. 2 is the utility model relates to a natural gas hydrate reservoir sand control device's sand control unit's schematic structure diagram.
Fig. 3 is the utility model relates to a natural gas hydrate reservoir sand control device's sand control unit's decomposition schematic diagram.
Figure 4 is the utility model relates to a natural gas hydrate reservoir sand control device's sand control unit's internal structure schematic diagram.
Fig. 5 is the utility model relates to a natural gas hydrate reservoir sand control device implements schematic diagram at the sand control of sea area natural gas hydrate reservoir.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be further described below with reference to the accompanying drawings.
Referring to fig. 1, an embodiment of the utility model provides a natural gas hydrate reservoir sand control device, including keeping off sand section of thick bamboo 1, parent tube 2, a plurality of sand control unit 3, drive circuit 4 and power 5 set up alone.
The sand blocking cylinder 1 is of a hollow structure with an open top end, and a plurality of through holes 11 are formed in the side wall of the sand blocking cylinder 1; in this embodiment, the sand trap 1 may be a wire-wrapped screen.
The base tube 2 is of a hollow structure with an open top end, the base tube 2 is positioned in the sand blocking cylinder 1, sand blocking media 6 are filled between the side wall of the base tube 2 and the inner wall of the sand blocking cylinder 1, a plurality of circles of threaded holes 21 are uniformly formed in the lower end of the base tube 2 along the side wall, a drain pipe 22 is inserted into the base tube 2, and the bottom end of the drain pipe 22 is close to the bottom end of the base tube 2; in this embodiment, the sand blocking medium 6 may be gravel, metal fiber, or artificial ceramsite.
Referring to fig. 2, 3 and 4, the sand control unit 3 includes a cap 31, a cover 32, a first rubber seal ring 33, a metal sheet 34, a piezoelectric ceramic ring 35 and a second rubber seal ring 36, where the cap 31 and the cover 32 are both hollow cavity structures with two open ends, a groove 311 is formed in the inner side of the cap 31, the first rubber seal ring 33, the metal sheet 34, the piezoelectric ceramic ring 35 and the second rubber seal ring 36 are sequentially placed at the groove 311 from top to bottom, the piezoelectric ceramic ring 35 is sleeved and connected with the metal sheet 34, a first thread 312 is further formed in the inner side of the cap 31, the first thread 312 is located below the groove 311, the cover 32 includes a cover upper portion 321 and a cover lower portion 322, a second thread 3211 is formed in the outer side of the cover upper portion 321, the second thread 3211 is connected with the first thread 312 in a matching manner, and the first rubber seal ring 33, the metal sheet 34, 3211, and a second thread 3211 are connected with the first thread 312 in a matching manner, Piezoceramics circle 35 and second rubber seal 36 encapsulate in block 31, and the outside of lid lower part 322 sets up third screw thread 3221, and third screw thread 3221 is connected with screw hole 21 cooperation to with sand control unit 3 and parent tube 2 threaded connection, through threaded connection's mode, be convenient for dismantle, overhaul and change sand control unit 3.
A plurality of conical holes 341 with the diameter of 5 micrometers are uniformly formed in the middle of the metal sheet 34, a first welding point 342 is arranged on the metal sheet 34, a second welding point 351 is arranged on the piezoelectric ceramic ring 35, the first welding point 342 and the second welding point 351 are both connected with a first cable 7, the first cable 7 is connected with the output end of the driving circuit 4 through a second cable 8, and the input end of the driving circuit 4 is connected with the power supply 5; in this embodiment, the power supply 5 may be connected to an offshore wind power generation or solar power supply, thereby saving energy.
Referring to fig. 5, the process of performing gas hydrate reservoir test production by using the sand control device provided by the embodiment includes: the base pipe 2 and the sand blocking cylinder 1 are both put into a hydrate reservoir section casing, a sand blocking medium 6 is filled between the base pipe 2 and the sand blocking cylinder 1, and then the upper end of the base pipe 2 is in threaded connection with a petroleum production pipe column; a packer 9 is arranged at the upper end of the sand blocking cylinder 1 to seal the upper end of the base pipe 2 from the annular space of the casing pipe; the drain pipe 22 is inserted into the base pipe 2, the bottom end of the drain pipe 22 is close to the bottom end of the base pipe 2, the production pipe column is connected with the gas production channel, the drain pipe 22 is connected with the water production channel, the water and material reservoir is produced by matching a depressurization method, the natural gas hydrate reservoir flows to the position of the sand blocking barrel 1, coarse sand with the diameter larger than 20 micrometers in the reservoir is blocked by the sand blocking medium 6, then the natural gas water and material reservoir flows to the metal sheet 34 along the hollow cavity of the cover cap 31, and fine sand with the diameter larger than 5 micrometers in the reservoir is blocked by the conical hole 341.
After the power supply 5 is started, positive and negative alternating voltages are provided for the metal sheet 34 and the piezoelectric ceramic ring 35 through the driving circuit 4, the first cable 7 and the second cable 8, the piezoelectric ceramic ring 35 generates high-frequency vibration under the piezoelectric effect, the piezoelectric ceramic ring 35 drives the metal sheet 34 to vibrate after vibration, the taper hole 341 on the metal sheet 34 generates complex and irregular vibration, deformation, pump effect and gradual expansion/gradual reduction motion under the vibration effect, hydrate reservoir fluid in the taper hole 341 forms independent small droplets (the diameter of the small droplets is smaller than that of the taper hole 341), the small droplets are continuously sprayed into the base tube 2 along the taper hole 341 and the hollow cavity of the cover body 32, the capillary seepage capability is improved in the process, and gas, decomposition water, dissolved gas in the decomposition water and fine sand particles with the diameter of less than or equal to 5 micrometers in the reservoir sequentially pass through the taper hole 341 and the hollow cavity of the cover body 32 and then are produced into the base tube 2, the water produced in the base pipe 2 can be pumped out by means of the water discharge pipe 22 and the produced natural gas can be collected and produced by means of the production string.
The driving circuit 4 capable of driving the piezoelectric ceramic ring 35 to vibrate is a conventional driving circuit, so the driving circuit 4 is not specifically limited in this embodiment, and the driving circuits capable of driving the piezoelectric ceramic ring to vibrate in the conventional driving circuit are all specific implementations of the driving circuit 4 in this embodiment.
The above mentioned parts are not related to the prior art.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (8)
1. The utility model provides a natural gas hydrate reservoir sand control device, its characterized in that, includes a sand blocking cylinder, parent tube and a plurality of sand control unit, a sand blocking cylinder and parent tube are the open hollow structure in top, the parent tube is located a sand blocking cylinder, the sand control unit sets up along the lateral wall circumference of parent tube, the sand control unit includes block cap, lid and sheetmetal, block cap and lid are the open hollow cavity structures in both ends, the recess is seted up to the inboard of block cap, the sheetmetal is placed in the groove, the lid includes lid upper portion and lid lower part, block cap and lid upper portion threaded connection, the lateral wall threaded connection of lid lower part and parent tube, the sheetmetal only allows the fine sand granule that the diameter is not more than 5 microns to pass through.
2. The natural gas hydrate reservoir sand control device according to claim 1, wherein the sand control unit further comprises a first rubber sealing ring, a piezoelectric ceramic ring and a second rubber sealing ring, the first rubber sealing ring, the metal sheet, the piezoelectric ceramic ring and the second rubber sealing ring are sequentially placed at the groove from top to bottom, the piezoelectric ceramic ring is sleeved with the metal sheet and connected with the metal sheet, the piezoelectric ceramic ring is driven by voltage to vibrate, and the piezoelectric ceramic ring vibrates to drive the metal sheet to vibrate.
3. The natural gas hydrate reservoir sand control device according to claim 1, wherein a plurality of taper holes with the diameter of 5 microns are uniformly formed in the middle of the metal sheet.
4. The natural gas hydrate reservoir sand control device according to claim 1, wherein a first thread is arranged on the inner side of the cap and located below the groove, and a second thread is arranged on the outer side of the upper part of the cover body and is in fit connection with the first thread.
5. The natural gas hydrate reservoir sand control device according to claim 1, wherein the lower end of the base pipe is uniformly provided with a plurality of circles of threaded holes along the side wall, the outer side of the lower portion of the cover body is provided with third threads, and the third threads are connected with the threaded holes in a matched mode.
6. The gas hydrate reservoir sand control device of claim 1, wherein a sand blocking medium is filled between the side wall of the base pipe and the inner wall of the sand blocking cylinder, and the sand blocking medium allows only fine sand particles with a diameter of not more than 20 microns to pass through.
7. The gas hydrate reservoir sand control device of claim 1, wherein a drain pipe is inserted into the base pipe, and a bottom end of the drain pipe is close to a bottom end of the base pipe.
8. The natural gas hydrate reservoir sand control device according to claim 1, wherein a plurality of through holes are formed in the side wall of the sand blocking cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120379824.XU CN214944182U (en) | 2021-02-20 | 2021-02-20 | Natural gas hydrate reservoir sand control device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120379824.XU CN214944182U (en) | 2021-02-20 | 2021-02-20 | Natural gas hydrate reservoir sand control device |
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| CN214944182U true CN214944182U (en) | 2021-11-30 |
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| CN202120379824.XU Active CN214944182U (en) | 2021-02-20 | 2021-02-20 | Natural gas hydrate reservoir sand control device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112855091A (en) * | 2021-02-20 | 2021-05-28 | 中国地质大学（武汉） | Natural gas hydrate reservoir sand control device |
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2021
- 2021-02-20 CN CN202120379824.XU patent/CN214944182U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112855091A (en) * | 2021-02-20 | 2021-05-28 | 中国地质大学（武汉） | Natural gas hydrate reservoir sand control device |
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