CN115596411B - A downhole disturbing flow and sand carrying device - Google Patents
A downhole disturbing flow and sand carrying deviceInfo
- Publication number
- CN115596411B CN115596411B CN202110778831.1A CN202110778831A CN115596411B CN 115596411 B CN115596411 B CN 115596411B CN 202110778831 A CN202110778831 A CN 202110778831A CN 115596411 B CN115596411 B CN 115596411B
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- China
- Prior art keywords
- downhole
- sand
- channel
- carrying device
- passage
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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
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
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- Life Sciences & Earth Sciences (AREA)
- 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)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention provides an underground turbulent flow sand carrying device which comprises a body, a first pump and a second pump, wherein the body is connected to an oil extraction pump and is internally provided with a first channel for fluid circulation. And a second channel extending out of the body along the radial direction of the body, wherein the second channel is provided with a liquid inlet far away from the body and a liquid outlet communicated with the first channel. The size of the second channel gradually decreases along the direction approaching the body, so that the flow rate of the fluid flowing from the liquid inlet to the liquid outlet gradually increases. The underground turbulent flow sand carrying device can effectively improve the flow velocity and sand carrying capacity of underground fluid and avoid the sand settling phenomenon at the bottom of an oil well.
Description
Technical Field
The invention relates to the field of oil and gas exploitation, in particular to an underground turbulence sand carrying device.
Background
Loose sandstone reservoirs are often encountered during oil recovery. The loose sandstone reservoir is mixed with a large amount of stratum sand in the oil production process. Therefore, for loose sandstone reservoirs, jet pumps or screw pumps are generally adopted for sand carrying exploitation in order to improve the productivity of oil wells and reduce maintenance operations.
In practice, for an oil well reservoir completion, the flow rate of the fluid will gradually decrease from top to bottom, and at the same time, the area of the cavity of the casing is several times that of the cavity of the oil pipe (or the tail pipe of the pump). Thus, the reservoir completion interval is less in fluid flow rate, generally less than the critical sand carrying flow rate of the fluid, in whole or in part. This situation can result in a pump with less efficiency to carry sand and thus a well bottom sand setting phenomenon. When sand setting is severe, the completion will be buried by sand setting, thereby affecting the normal production of the well.
Disclosure of Invention
Aiming at the technical problems, the invention aims to provide the underground turbulent sand carrying device which can effectively improve the flow velocity and sand carrying capacity of underground fluid and avoid the sand settling phenomenon at the bottom of an oil well.
According to the invention, the underground turbulent flow sand carrying device comprises a body which is used for being connected to an oil production pump, wherein a first channel for fluid circulation is formed in the body. And a second channel extending out of the body along the radial direction of the body, wherein the second channel is provided with a liquid inlet far away from the body and a liquid outlet communicated with the first channel.
The size of the second channel gradually decreases along the direction approaching the body, so that the flow rate of the fluid flowing from the liquid inlet to the liquid outlet gradually increases.
In a preferred embodiment, an upper cover and a lower cover extending radially along the body are provided at an end of the body remote from the oil extraction pump, and the second passage is provided between the upper cover and the lower cover.
In a preferred embodiment, a plurality of spacers are disposed on the lower cover body and uniformly distributed along the circumferential direction, so that the second channel is divided into a plurality of flow channels distributed along the circumferential direction of the lower cover body, and the size of the spacers gradually increases along the direction approaching the body.
In a preferred embodiment, the upper cover body and the lower cover body have a first curved surface curved toward the direction of the oil extraction pump, and the side wall of the partition body is configured as a second curved surface, and the end of the second curved surface converges at the liquid discharge port.
In a preferred embodiment, a deflector configured as a cone is also provided on the side wall of the oil extraction pump, the free end of the deflector being connected to the upper cover.
In a preferred embodiment, a seal is also included at an end of the second channel adjacent the inlet.
In a preferred embodiment, the side wall of the seal adjacent to the side of the body is configured as a conical surface.
In a preferred embodiment, a filter layer is further provided on the drain.
In a preferred embodiment, the upper cover, the lower cover and the baffle are made of ceramic material, and the baffle is detachably connected to the body.
In a preferred embodiment, a shock absorbing ring is also provided between the body and the upper cover.
Drawings
The present invention will be described below with reference to the accompanying drawings.
FIG. 1 shows a schematic view of a downhole turbulent sand carrying device according to the present invention.
FIG. 2 is a schematic cross-sectional view of the downhole spoiler sand carrier of FIG. 1 taken along the A-A' direction.
FIG. 3 is a schematic cross-sectional view of the downhole turbulent sand carrier of FIG. 1 along the direction B-B'.
In the present application, all of the figures are schematic drawings which are intended to illustrate the principles of the application only and are not to scale.
Detailed Description
The invention is described below with reference to the accompanying drawings.
FIG. 1 illustrates a downhole spoiler sand carrier 100 according to one embodiment of the invention. As shown in fig. 1, the downhole turbulent sand carrier 100 includes a body 10 for connection to a production pump 11. The body 10 is configured in a tubular shape, and a first passage 20 for fluid communication is provided in the body 10, and the first passage 20 communicates with a suction port of the oil extraction pump 11. Whereby fluid in the first channel 20 is transported to the surface wellhead by said production pump 11.
A second channel 30 for fluid communication with the first channel 20 is also provided on the body 10. Specifically, an upper cover 42 and a lower cover 44 extending in the radial direction of the body 10 are provided on the body 10. A gap 43 is formed between the upper cover 42 and the lower cover 44, and the second passage 30 is provided in the gap 43.
As shown in fig. 1, the end of the second channel 30 away from the body 10 is formed as a liquid inlet 36, and the end near the body 10 is formed as a liquid outlet 38. The drain port 38 extends into the first passage 20, thereby ensuring communication between the first passage 20 and the second passage 30.
In the present invention, the size of the second passage 30 gradually decreases in a direction approaching the body 10. It will be readily appreciated that the flow rate of the fluid will gradually increase as the size of the second passage 30 decreases during the flow of the fluid downhole from the inlet 36 to the outlet 38. Whereby the flow rate of the downhole fluid is brought to a critical sand carrying speed by increasing the flow rate.
And because the sand carrying content of the underground fluid of each oil well is different, the critical sand carrying speed of different oil wells is different. By adjusting the dimension difference between the two ends of the second channel 30, the velocity difference between the outflow velocity when the downhole fluid flows to the liquid inlet and outlet 38 and the inflow velocity when the downhole fluid enters the liquid inlet and outlet 36 can be adjusted, and the dimension difference between the two ends of the second channel 30 can be flexibly adjusted according to different sand carrying contents and inflow velocities, so that the downhole turbulent sand carrying device 100 can be applied to oil wells with different working conditions.
And according to bernoulli's theorem, as the flow rate of fluid flowing into the second channel 30 increases, the pressure thereof decreases, thereby creating a pressure differential across the second channel 30, i.e., the pressure at the drain port 38 is less than the pressure at the inlet port 36. It will be readily appreciated that such a pressure differential will on the one hand help to increase the rate of flow of fluid into the further portion and on the other hand also will allow for easier flow of sand-carrying downhole fluid from the second passage 30 into the first passage 20.
In addition, as the velocity of the downhole fluid increases, its Reynolds number Re increases, thereby changing the state of motion of the downhole fluid in the second channel 30 from laminar to turbulent. When the underground fluid is in a turbulent state, the sand and the stone contained in the fluid can be sufficiently stirred, so that the sand carrying capacity of the underground fluid can be improved, and the sand and stone deposition can be prevented from blocking the oil extraction pump 11, the first channel 20 and the second channel 30.
In a preferred embodiment, the upper and lower covers 42 and 44 are configured as a first curved surface 41 curved toward the direction of the oil recovery pump 11 such that the second channel 30 is formed as a curved channel. Such an irregular curved channel may be advantageous for further increasing the reynolds number of the downhole fluid compared to a conventional straight channel.
As shown in fig. 1, in a preferred embodiment, a baffle 25 is also provided on the side wall of the oil recovery pump 11. The free end 26 of the deflector 25 is connected to the liquid inlet 36 such that the liquid inlet 36 is located on the side of the free end 26 remote from the body 10. The baffle 25 is tapered, so that the baffle 25 can collect and guide the underground fluid flowing from the liquid inlet 36, and the efficiency of collecting the underground fluid by the liquid inlet 36 is improved.
Meanwhile, a filter layer 37 is also arranged at the liquid inlet 36. The filter layer 37 can filter the solid impurities in the well, which are too large in particle size, outside the second channel 30, so as to prevent the solid impurities from blocking the second channel 30, the first channel 20 and other well channels.
In addition, as shown in fig. 1, a seal 50 is provided on the side of the filter layer 37 remote from the body 10. The seal 50 is preferably configured as a deformable resilient member sized slightly larger than the well wall. Therefore, when the downhole turbulent sand carrying device 100 is located downhole, the fluid above the downhole turbulent sand carrying device 100 can be deformed to a certain extent and is abutted against the well wall, so that the fluid above the downhole turbulent sand carrying device 100 is prevented from bypassing the second channel 30 and flowing below the downhole turbulent sand carrying device 100.
In a preferred embodiment, the side wall 55 of the seal 50 adjacent to the side of the body 10 is configured as a tapered surface. This allows the seal 50 to also collect and divert the flow of downhole fluid flowing from the inlet 36, further improving the efficiency of the inlet 36 in collecting downhole fluid.
In a preferred embodiment, the baffle 25 is removably attached to the body 10. Specifically, the deflector 25 is connected to the body 10 by the shear pin 16. Thus, under extreme conditions, when the sand carrying effect of the downhole turbulent sand carrying device 100 is not ideal and formation sand is deposited to generate a sand blocking accident, a worker can shear the shear pin 16 through the lifting pipe column, so that the separation of the oil extraction pump 11 and the downhole turbulent sand carrying device 100 is realized.
Meanwhile, the upper cover 42, the lower cover 44 and the baffle 25 are preferably made of a ceramic material that is easily ground by tools such as shoes. Therefore, after the separation of the oil extraction pump 11 and the underground turbulent flow sand carrying device 100 is realized, the underground unrepresented upper cover 42, lower cover 44 and guide plate 25 can be subjected to drilling and grinding treatment by lifting the oil extraction pump 11 and descending into grinding shoes and other tools in the underground until the drilled and ground fragments can be brought out of the wellhead by the workover fluid. By the arrangement, the occurrence of the underground fish accident can be effectively prevented.
In addition, as shown in fig. 1, a damper ring 19 is provided at a connection portion between the main body 10 and the upper cover 42. The upper cover 42 is connected with the body 10 through the damper ring 19. The shock absorbing ring 19 is made of a material having good elasticity, and can reduce the relative vibration between the oil extraction pump 11 and the body 10. Thereby avoiding fatigue failure caused by cracks of the ceramic material in the vibration process, and improving the stability and the service life of the underground turbulent sand carrying device 100.
FIG. 2 is a schematic cross-sectional view of the downhole spoiler sand carrier of FIG. 1 taken along the A-A' direction. As shown in fig. 2, the filter layer 37 is provided as a mesh screen. The filtering accuracy can be adjusted according to different production practices to increase the range of use of the filter layer 37.
FIG. 3 is a schematic cross-sectional view of the downhole turbulent sand carrier of FIG. 1 along the direction B-B'. As shown in fig. 3, a plurality of spacers 60 are provided on the lower cover 44. The partitions 60 are uniformly arranged on the lower cover 44 in the circumferential direction so that the second passages 30 are divided into a plurality of independent flow passages 65 uniformly distributed in the circumferential direction of the lower cover 44. Wherein the size of the separator 60 is set to gradually increase in a direction approaching the body 10, ensuring that the size of the flow passage 65 gradually decreases in this direction (i.e., the size of the second passage 30 gradually decreases in this direction).
In a preferred embodiment, the side walls of the separator 60 are also configured as irregular second curved surfaces 61, the ends of the second curved surfaces 61 converging at the drain port 38. The side walls of the flow channel 65 (i.e., the second channel 30) can thus be simultaneously configured as irregularly curved surfaces by the partition 60 and the upper and lower covers 42 and 44. By this arrangement, the reynolds number of the downhole fluid flowing through the second passage 30 can be further increased, and the sand carrying effect of the downhole fluid can be improved.
The operation of the downhole turbulent sand-carrying device 100 according to the present invention is briefly described below.
The downhole turbulent flow sand-carrying device 100 of the present invention is used for connecting to the oil production pump 11 and is lowered below the completion of the well along with the down-hole string. During well production, sand-containing fluid produced in the well will flow under gravity through the baffle 25 into the second passage 30. As the fluid flows in the second passage 30, the flow rate thereof gradually increases to a critical sand carrying speed.
At the same time, as the fluid flows in the second channel 30, its reynolds number increases with the flow and becomes turbulent. At this time, the fluid in the turbulent state can sufficiently stir the carried sand, thereby further improving the sand carrying capacity of the fluid and preventing sand from depositing to block each pipeline in the well.
When the fluid reaches the drain port 38, the fluid enters the first channel 20 and is transported to the ground under the driving of the oil extraction pump 11.
When the sand carrying effect of the downhole turbulent sand carrying device 100 is not ideal, sand that cannot be carried can be deposited under the device via 38. If sand blocking accidents occur due to stratum sand deposition, a worker can shear the shear pin 16 through the lifting pipe column, so that the body 10 and the underground turbulent sand carrying device 100 are separated. The part of the turbulence sand carrying device 100 which is not lifted down is then drilled and ground by lifting up the body 10 and putting down a mill shoe or the like down the well, and the drilled and ground fragments can be carried out of the wellhead by the workover fluid.
Finally, it should be noted that the above description is only of a preferred embodiment of the invention and is not to be construed as limiting the invention in any way. Although the invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the techniques described in the foregoing examples, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A downhole turbulent flow sand carrying device comprising:
A body (10) for connection to an oil recovery pump (11), said body having a first passage (20) for fluid communication therein, and a second passage (30) extending radially out of the body, said second passage having a liquid inlet (36) remote from the body and a liquid outlet (38) in communication with said first passage,
Wherein the size of the second channel gradually decreases along the direction approaching the body, so that the flow velocity of the fluid flowing from the liquid inlet to the liquid outlet gradually increases,
An upper cover body (42) and a lower cover body (44) which extend along the radial direction of the body are arranged at one end of the body, which is far away from the oil extraction pump, the second channel is arranged between the upper cover body and the lower cover body,
A plurality of separators (60) which are uniformly distributed along the circumferential direction are arranged on the lower cover body, so that the second channel is divided into a plurality of flow channels (65) which are distributed along the circumferential direction of the lower cover body,
The size of the separator gradually increases in a direction approaching the body.
2. The downhole turbulent sand carrier of claim 1, wherein the upper and lower covers have a first curved surface (41) curved in a direction toward the oil recovery pump,
The side wall of the separator is configured into a second curved surface (61), and the tail end of the second curved surface is converged at the liquid outlet.
3. A downhole turbulence sand carrier according to claim 1 or 2, wherein a deflector (25) is arranged on the side wall of the body, which deflector has a conical configuration, the free end (26) of the deflector being connected to the upper cover.
4. The downhole turbulent sand carrier of claim 1 or 2, further comprising a seal (50) provided at an end of the second passage adjacent the inlet.
5. The downhole spoiler sand carrier of claim 4, wherein a sidewall (55) of the seal adjacent to the body side is configured as a tapered surface.
6. A downhole turbulence sand carrying device according to claim 1 or 2, wherein a filter layer (37) is further provided on the inlet.
7. A downhole turbulent sand carrier according to claim 3, wherein the upper cover, lower cover and baffle are made of ceramic material, the baffle being detachably connected to the body.
8. A downhole turbulence sand carrying device according to claim 1 or 2, wherein a damping ring (19) is further provided between the body and the upper cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110778831.1A CN115596411B (en) | 2021-07-09 | 2021-07-09 | A downhole disturbing flow and sand carrying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110778831.1A CN115596411B (en) | 2021-07-09 | 2021-07-09 | A downhole disturbing flow and sand carrying device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115596411A CN115596411A (en) | 2023-01-13 |
| CN115596411B true CN115596411B (en) | 2025-09-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110778831.1A Active CN115596411B (en) | 2021-07-09 | 2021-07-09 | A downhole disturbing flow and sand carrying device |
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| Country | Link |
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| CN (1) | CN115596411B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202325322U (en) * | 2011-11-25 | 2012-07-11 | 天津海通油田工程技术服务有限责任公司 | Sand-carrying fluidic device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO306027B1 (en) * | 1997-10-27 | 1999-09-06 | Testtech Services As | Apparatus for removing sand in an underwater well |
| CN2648106Y (en) * | 2003-07-17 | 2004-10-13 | 中国石油天然气股份有限公司 | Two-channel sand setting communication device under the pump |
| CN107816337B (en) * | 2016-09-12 | 2020-02-14 | 中国石油天然气股份有限公司 | Sand-carrying oil production method based on hydraulic jet pump |
| CN208473833U (en) * | 2018-05-24 | 2019-02-05 | 中国石油天然气股份有限公司 | A cyclone sand removal device |
| CN109025946B (en) * | 2018-08-23 | 2020-12-01 | 陕西延长石油(集团)有限责任公司研究院 | Adjustable is supercritical carbon dioxide efflux mulling device in pit |
| CN211201823U (en) * | 2019-08-21 | 2020-08-07 | 中国石油天然气股份有限公司 | Sand collecting device |
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2021
- 2021-07-09 CN CN202110778831.1A patent/CN115596411B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202325322U (en) * | 2011-11-25 | 2012-07-11 | 天津海通油田工程技术服务有限责任公司 | Sand-carrying fluidic device |
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| CN115596411A (en) | 2023-01-13 |
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