CN115596411A - Down-hole turbulent flow sand-carrying device - Google Patents
Down-hole turbulent flow sand-carrying device Download PDFInfo
- Publication number
- CN115596411A CN115596411A CN202110778831.1A CN202110778831A CN115596411A CN 115596411 A CN115596411 A CN 115596411A CN 202110778831 A CN202110778831 A CN 202110778831A CN 115596411 A CN115596411 A CN 115596411A
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- sand
- downhole
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- fluid
- carrying device
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- 239000012530 fluid Substances 0.000 claims abstract description 51
- 239000007788 liquid Substances 0.000 claims abstract description 26
- 239000004576 sand Substances 0.000 claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 238000000605 extraction Methods 0.000 claims description 13
- 238000005192 partition Methods 0.000 claims description 7
- 229910010293 ceramic material Inorganic materials 0.000 claims description 4
- 238000013016 damping Methods 0.000 claims description 3
- 125000006850 spacer group Chemical group 0.000 claims description 2
- 239000003129 oil well Substances 0.000 abstract description 7
- 238000004891 communication Methods 0.000 abstract description 4
- 230000000903 blocking effect Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 238000000151 deposition Methods 0.000 description 4
- 238000000227 grinding Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000008021 deposition Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Images
Classifications
-
- 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 for attachment to a production pump, the body having a first passageway therein for fluid communication. 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 is gradually reduced along the direction close to the body, so that the flow speed of the fluid flowing from the liquid inlet to the liquid outlet is gradually increased. The underground turbulent flow sand-carrying device can effectively improve the flow velocity and sand-carrying capacity of underground fluid and avoid the sand setting 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 turbulent flow sand-carrying device.
Background
Loose sandstone reservoirs are often encountered during oil production. Such unconsolidated sandstone reservoirs are contaminated with large quantities of formation sand during the oil production process. Therefore, for loose sandstone oil reservoirs, in order to improve the productivity of oil wells and reduce maintenance operations, a jet pump or a screw pump is usually adopted for sand-carrying exploitation.
In actual production, the flow rate of the fluid decreases gradually from the top to the bottom for the completion section of the oil well reservoir, and the inner cavity area of the downhole casing is several times larger than that of the oil pipe (or the tail pipe of the pump). Thus, the fluid flow rate for all or part of the reservoir completion is relatively low, typically less than the critical sand-carrying flow rate of the fluid. This situation can result in a lower sand-carrying efficiency of the pump, thereby creating a phenomenon of sand settling at the bottom of the well. When the sand setting is severe, the completion section may be buried by the 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 flow sand-carrying device which can effectively improve the flow velocity and the sand-carrying capacity of underground fluid and avoid the sand setting phenomenon at the bottom of an oil well.
According to the present invention, there is provided an underground disturbed flow sand-carrying device, comprising: a body for attachment to a production pump, the body having a first passageway therein for fluid communication. 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 is gradually reduced along the direction close to the body, so that the flow speed of the fluid flowing from the liquid inlet to the liquid outlet is gradually increased.
In a preferred embodiment, an upper cover body and a lower cover body which extend along the radial direction of the body are arranged at one end of the body far away from the oil extraction pump, and the second channel is arranged between the upper cover body and the lower cover body.
In a preferred embodiment, a plurality of partition bodies 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 which are distributed along the circumferential direction of the lower cover body, and the size of each partition body is gradually increased along the direction close to 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 baffle plate in a conical shape is further arranged on the side wall of the oil extraction pump, and the free end of the baffle plate is connected with the upper cover body.
In a preferred embodiment, the liquid container further comprises a sealing member disposed at an end of the second channel adjacent to the liquid inlet.
In a preferred embodiment, the side wall of the sealing element on the side close to the body is configured as a conical surface.
In a preferred embodiment, a filter layer is further disposed on the liquid discharge port.
In a preferred embodiment, the upper cover body, the lower cover body and the guide plate are made of ceramic materials, and the guide plate is detachably connected to the body.
In a preferred embodiment, a shock absorbing ring is further arranged between the body and the upper cover body.
Drawings
The present invention will be described below with reference to the accompanying drawings.
FIG. 1 shows a schematic of a downhole fluid-borne sand-carrying device according to the present invention.
FIG. 2 isbase:Sub>A schematic sectional view of the down-hole turbulent sand-carrying device shown in FIG. 1, taken along the direction A-A'.
FIG. 3 is a schematic sectional view of the down-hole turbulent sand-carrying device shown in FIG. 1, taken along the direction B-B'.
In the present application, the drawings are schematic, merely illustrative of the principles of the invention, and are not drawn to scale.
Detailed Description
The invention is described below with reference to the accompanying drawings.
FIG. 1 shows a downhole turbulent sand-entraining device 100 according to one embodiment of the present invention. As shown in fig. 1, the downhole turbulent sand-carrying device 100 includes a body 10 for connection to an oil 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 recovery pump 11. Thereby delivering fluid in the first passage 20 to the surface wellhead via the production pump 11.
The body 10 is further provided with a second passage 30 communicating with the first passage 20 and through which a fluid flows. Specifically, an upper cover 42 and a lower cover 44 extending in a 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, an end of the second channel 30 away from the body 10 is formed as a liquid inlet 36, and an end close to 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 channel 30 is gradually reduced in a direction approaching the body 10. It will be readily appreciated that as fluid flows downhole from the inlet port 36 to the outlet port 38, the flow rate of the fluid will gradually increase as the size of the second passageway 30 decreases. Thereby increasing the flow rate of the downhole fluid such that the flow rate reaches a critical sand-carrying velocity.
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 size difference between the two ends of the second channel 30, the speed difference between the outflow speed of the downhole fluid flowing to the fluid inlet/outlet 38 and the inflow speed of the downhole fluid flowing into the fluid inlet 36 can be adjusted, and the size difference between the two ends of the second channel 30 can be adjusted flexibly according to different sand-carrying contents and inflow speeds, so that the downhole turbulent sand-carrying device 100 can be suitable for oil wells under different working conditions.
According to Bernoulli's theorem, as the flow rate of the fluid flowing into the second channel 30 increases, the pressure thereof decreases, so that a pressure difference is formed between the two ends of the second channel 30, i.e., the pressure at the liquid outlet 38 is lower than that at the liquid inlet 36. It will be readily appreciated that this pressure differential assists in increasing the rate of flow of fluid on the one hand and also allows downhole fluid carrying sand to flow more easily from the second passage 30 into the first passage 20 on the other hand.
In addition, as the velocity of the downhole fluid is increased, the reynolds number Re of the downhole fluid is also increased, so that the motion state of the downhole fluid in the second channel 30 can be changed from laminar flow to turbulent flow. When the downhole fluid is in a turbulent state, the sand contained in the fluid can be sufficiently stirred, so that the sand carrying capacity of the downhole fluid can be improved, and the sand can be prevented from depositing and blocking the oil extraction pump 11, the first channel 20 and the second channel 30.
In a preferred embodiment, the upper cover 42 and the lower cover 44 are configured as a first curved surface 41 that is curved toward the direction of the oil recovery pump 11, so that the second passage 30 is formed as a curved passage. Such irregularly curved channels are advantageous for further increasing the reynolds number of the downhole fluid compared to conventional straight channels.
As shown in fig. 1, in a preferred embodiment, a baffle 25 is further disposed on a sidewall of the oil extraction pump 11. The free end 26 of the baffle 25 is connected at the inlet 36 such that the inlet 36 is located on the side of the free end 26 remote from the body 10. The guide plate 25 is arranged to be conical, so that the guide plate 25 can collect and guide the underground fluid flowing in 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 arranged at the liquid inlet 36. The filter layer 37 can filter solid impurities in the downhole with excessive particle size outside the second channel 30, and prevent the solid impurities from blocking the downhole channels such as the second channel 30 and the first channel 20.
In addition, as shown in fig. 1, a sealing member 50 is provided on a side of the filter layer 37 away from the body 10. The sealing element 50 is preferably provided as a deformable resilient member sized slightly larger than the borehole wall. Therefore, when the downhole turbulent sand-carrying device 100 is located downhole, the downhole turbulent sand-carrying device can deform to some extent and abut against the well wall, so that fluid located 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. Thereby enabling the sealing member 50 to also collect and guide the downhole fluid flowing from the fluid inlet 36, and further improving the efficiency of the fluid inlet 36 in collecting the downhole fluid.
In a preferred embodiment, the baffle 25 is removably attached to the body 10. Specifically, the baffle 25 is connected to the body 10 by a shear pin 16. Thus, under extreme conditions, when the underground turbulent flow sand-carrying device 100 has an unsatisfactory sand-carrying effect and causes formation sand blocking accidents caused by deposition, a worker can cut off the shear pin 16 by lifting the pipe column, so that the separation of the oil extraction pump 11 and the underground turbulent flow 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, which is easily ground by a tool such as a grinding shoe. Therefore, after the oil extraction pump 11 is separated from the downhole turbulent flow sand-carrying device 100, the downhole undelivered upper cover body 42, the downhole lower cover body 44 and the guide plate 25 can be drilled and ground by lifting the oil extraction pump 11 and putting tools such as grinding shoes down downhole until the drilled and ground chips can be taken out of a wellhead by workover fluid. Through the arrangement, the underground fish falling accident can be effectively prevented.
In addition, as shown in fig. 1, a damper ring 19 is further provided at a connection portion between the main body 10 and the upper cover 42. The upper cover 42 is connected to the main body 10 via a damping ring 19. The damping ring 19 is made of a material having good elasticity, and can reduce relative vibration between the oil extraction pump 11 and the body 10. Thereby avoiding the ceramic material from generating cracks in the vibration process to cause fatigue failure, improving the stability of the underground turbulent flow sand-carrying device 100 and prolonging the service life.
FIG. 2 isbase:Sub>A schematic cross-sectional view of the downhole turbulent sand-entraining device shown in FIG. 1 taken along the direction A-A'. As shown in fig. 2, the filter layer 37 is provided as a barrier screen. The filtering accuracy can be adjusted according to different production practices to increase the application range of the filtering layer 37.
FIG. 3 is a schematic sectional view of the down-hole turbulent sand-carrying device shown in FIG. 1, taken along the direction B-B'. As shown in fig. 3, a plurality of spacers 60 are provided on the lower cover 44. The partition body 60 is uniformly arranged on the lower cover body 44 in the circumferential direction so that the second passage 30 is partitioned into a plurality of independent flow passages 65 uniformly distributed in the circumferential direction of the lower cover body 44. Wherein the size of the partition body 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 wall of the separator 60 is also configured as an irregular second curved surface 61, and the end of the second curved surface 61 converges at the liquid discharge port 38. Thereby, the side wall of the flow passage 65 (i.e., the second passage 30) can be simultaneously configured into an irregular curved surface by the partition body 60 and the upper and lower cover bodies 42 and 44. By the arrangement, the Reynolds number of the downhole fluid flowing through the second channel 30 can be further increased, and the sand carrying effect of the downhole fluid is improved.
The operation of the downhole turbulent sand-entraining device 100 according to the present invention is briefly described as follows.
The downhole turbulence sand-carrying device 100 is used for being connected with an oil extraction pump 11 and is lowered to the position below a well completion section along with a downhole string. During production of the well, the sand-containing fluid produced in the well will flow under gravity through the deflector 25 into the second passage 30. As the fluid flows in the second passage 30, its flow rate gradually increases to a critical sand-carrying velocity.
Meanwhile, as the fluid flows through the second passage 30, the reynolds number thereof increases with the flow and becomes a turbulent state. At this time, the fluid changed into a turbulent flow state can sufficiently stir the carried sand, thereby further improving the sand carrying capacity of the fluid and preventing the sand from depositing and blocking 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 by the oil extraction pump 11.
When the sand entrainment effect of the downhole turbulent sand entrainment device 100 is not ideal, sand that cannot be entrained may be deposited below the device via 38. If the formation sand deposition causes sand blocking accidents, workers can cut the shearing pin 16 through the lifting pipe column to realize the separation of the body 10 and the downhole turbulent sand-carrying device 100. And then, drilling and grinding treatment is carried out on the part of the turbulent flow sand-carrying device 100 which is not lifted underground by lifting the body 10 and downwards putting tools such as grinding shoes and the like, and the drilled and ground debris can be taken out of the wellhead by workover fluid.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and do not limit the present invention. Although the present 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 embodiments described in the foregoing examples, or that equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A down-hole turbulated sand-carrying device comprising:
a body (10) used for being connected with an oil extraction pump (11), a first channel (20) communicated with fluid is arranged in the body, and a second channel (30) extending out of the body along the radial direction of the body, the second channel is provided with a liquid inlet (36) far away from the body and a liquid outlet (38) communicated with the first channel,
the size of the second channel is gradually reduced along the direction close to the body, so that the flow speed of the fluid flowing from the liquid inlet to the liquid outlet is gradually increased.
2. A down-hole disturbed flow sand-carrying device according to claim 1, wherein an upper cover (42) and a lower cover (44) extending in a radial direction of 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.
3. The downhole turbulated sand entrainment device of claim 2, wherein a plurality of circumferentially evenly distributed spacers (60) are disposed on the lower head such that the second passageway is divided into a plurality of circumferentially distributed flow passages (65) of the lower head,
the size of the partition body is gradually increased in a direction approaching the body.
4. The downhole disturbed flow sand-carrying device according to claim 3, wherein the upper and lower covers have a first curved surface (41) curved towards the direction of the oil production pump,
the side wall of the separating body is constructed into a second curved surface (61), and the tail end of the second curved surface is converged at the liquid discharge opening.
5. A downhole turbulated sand-carrying apparatus according to any one of claims 2 to 4, wherein a deflector (25) configured as a cone is further provided on the sidewall of the body, and a free end (26) of the deflector is connected with the upper cover.
6. The downhole turbulent sand-entraining device according to any one of claims 1 to 4 further comprising a seal (50) disposed at an end of the second channel proximate the fluid inlet.
7. The downhole turbulent sand-entraining device according to claim 6 wherein the side wall (55) of the seal on the side of the body is configured as a conical surface.
8. A downhole turbulent sand-entraining device according to any one of claims 1-4, further comprising a filter layer (37) arranged on the liquid inlet.
9. The downhole turbulated sand-carrying apparatus of any one of claims 2 to 4, wherein the upper cap, the lower cap and the deflector are made of ceramic material, and the deflector is detachably connected to the body.
10. A downhole disturbed flow and sand carrying device according to any one of claims 2-4, wherein a damping ring (19) is further arranged between the body and the upper cover body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110778831.1A CN115596411A (en) | 2021-07-09 | 2021-07-09 | Down-hole turbulent flow sand-carrying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110778831.1A CN115596411A (en) | 2021-07-09 | 2021-07-09 | Down-hole turbulent flow sand-carrying device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115596411A true CN115596411A (en) | 2023-01-13 |
Family
ID=84841012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110778831.1A Pending CN115596411A (en) | 2021-07-09 | 2021-07-09 | Down-hole turbulent flow sand-carrying device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115596411A (en) |
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2021
- 2021-07-09 CN CN202110778831.1A patent/CN115596411A/en active Pending
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