CN108561116B - Trestle type downhole flow self-adaptive liquid-liquid separation device - Google Patents
Trestle type downhole flow self-adaptive liquid-liquid separation device Download PDFInfo
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- 238000000926 separation method Methods 0.000 title claims abstract description 131
- 239000007788 liquid Substances 0.000 title claims abstract description 95
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 139
- 239000003381 stabilizer Substances 0.000 claims abstract description 29
- 238000007789 sealing Methods 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 230000000149 penetrating effect Effects 0.000 claims description 9
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- 238000000034 method Methods 0.000 abstract description 7
- 239000003638 chemical reducing agent Substances 0.000 description 17
- 239000003921 oil Substances 0.000 description 17
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- 238000010586 diagram Methods 0.000 description 14
- 230000008569 process Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 5
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- 238000011105 stabilization Methods 0.000 description 5
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- 238000009434 installation Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000010779 crude oil Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000004945 emulsification Methods 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
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- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
- E21B43/38—Arrangements for separating materials produced by the well in the well
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Abstract
A trestle type underground flow self-adaptive liquid-liquid separation device. The main purpose is to provide a liquid-liquid separation device, which can automatically adjust the internal mechanical structure to adapt to the change of the incoming liquid flow, and complete and ensure the high-efficiency separation of two-phase media with different densities in the device. The method is characterized in that: the device comprises a reducing joint, an inlet pipe, a ring centralizer, a trestle type flow stabilizing unit, a reducing separation pipe, an overflow pipe and a float type voltage stabilizer which are connected in sequence; a separation cavity formed by sequentially connecting a cylindrical section rotational flow cavity, a large cone cavity, a small cone cavity and an underflow cavity is formed in the reducing separation tube; the trestle type flow stabilizing unit comprises a flow stabilizing slide block, a flow stabilizing piece, a flow stabilizing connecting rod, a flow stabilizing spring and a fancy positioning ring; the overflow pipe passes through the trestle type flow stabilizing unit; the trestle type flow stabilizing unit is positioned in the cylindrical section cyclone cavity to form a radial sealing structure between the flow stabilizing piece and the inner wall of the cylindrical section separation cavity; the float-type voltage stabilizer comprises a rubber float, a voltage stabilizing spring and a liquid discharge base.
Description
Technical Field
The invention relates to a liquid-liquid separation device applied to the fields of petroleum, chemical engineering, environmental protection and the like.
Background
Along with continuous development of oil fields, the water content of produced liquid is gradually improved, and the crude oil exploitation cost is increased day by day. At present, the dominant oil field in China enters the high water content development period, the water content of many oil fields exceeds 90 percent, and the comprehensive water content of Daqing oil fields reaches 94 percent. For high water content oil fields, the produced water treatment costs typically account for over 75% of the crude oil production costs. Oil well production is reaching economic limits and is forced to be abandoned due to the higher and higher energy consumption of water lifting from the wellbore to the surface and the higher and higher water treatment costs. In addition, the ground treatment of oily sewage also has potential environmental pollution problems. In order to solve a plurality of contradictions appearing in the middle and later periods of an oil field, the China department of science and technology and the China oil and Heng company successively establish 863 and major special projects to carry out scientific research and attack, oil-water separation is realized in a shaft, separated water is directly injected into a related stratum, and separated high-oil-content liquid is extracted to the ground, namely the same-well injection and extraction process. The core of the co-well injection-production process is an underground oil-water separation system, and the cyclone separation is widely applied to the fields of ground and underground oil-water separation, oilfield wastewater treatment and the like due to the advantages of convenience in operation, high separation efficiency, small equipment volume, long service life and the like. The cyclone separation utilizes the density difference between immiscible media to carry out centrifugal separation, the media with higher density are transported to the side wall under the action of centrifugal force, the media with lower density move to the axis, and finally, the media are discharged from different outlets to realize the interphase separation. However, the cyclone separation is greatly influenced by the change of the liquid inflow amount, and crude oil emulsification is caused when the liquid inflow amount is too high, so that the separation efficiency is sharply reduced, and meanwhile, when the liquid inflow amount is too low, the required centrifugal force cannot be achieved in the cyclone separation process, and the cyclone separation efficiency is still reduced. At present, an underground oil-water separation device which can realize flow stabilization and separation in an integral manner underground is not searched.
Disclosure of Invention
In order to solve the technical problems mentioned in the background technology, the invention provides a trestle type downhole flow self-adaptive liquid-liquid separation device, which is designed by a smart mechanical structure, so that the device adapts to liquid volume change conditions through self structure adjustment, stable flow and pressure are kept when mixed liquid flows enter a reducing separation pipe for centrifugal separation, the mixed liquid is always kept in an efficient separation state, the defect that rotational flow separation is influenced by flow change is overcome, mixed media enter the separation device at stable flow under the condition of no external force pressurization/depressurization, and continuous high-precision separation is kept.
The invention aims to: the problems that the conventional cyclone separation device is high in operating condition requirement, single in operating condition and application range and the like are solved; the limitation that the cyclone separation device with a specific structure can only process single operation parameters is solved, and the adaptability and the processing precision of the conventional separation device are improved; the problem of the oil-water separator in pit because of the low separation efficiency that undulant effects such as flow, pressure, velocity of flow caused is solved, the limitation that can't be applicable to the feed liquor volume change operating mode.
The technical scheme of the invention is as follows: the trestle type underground flow self-adaptive liquid-liquid separation device comprises a reducing joint, an inlet pipe, a ring type centralizer, a trestle type flow stabilizing unit, a reducing separation pipe, an overflow pipe and a float type voltage stabilizer; the top end of the overflow pipe is an oil phase outlet;
the upper end of the reducing joint is provided with a pipe cone thread for connecting with an underground oil pipe, the lower end of the reducing joint is provided with an inlet sealing thread for connecting with an inlet pipe, the center of the reducing joint is provided with a through hole, and the overflow pipe penetrates through the through hole; the upper end of the reducing joint is provided with an assembling hole, the lower end of the reducing joint is provided with a positioning hole, and the overflow pipe is positioned through an overflow pipe positioning thread;
the whole body of the inlet pipe is of a thin-wall cylindrical structure, a plurality of uniformly distributed through holes are formed in the pipe wall of the inlet pipe, the through holes form a mixed liquid inlet, the front end of the inlet pipe is connected with the reducing joint through threads, and the rear end of the inlet pipe is connected with the annular hole type centralizer through threads;
the main body of the ring hole type centralizer is a cylinder, a centralizing hole penetrating through the axis is formed in the center of the cylinder along the axial direction, and a plurality of flow guide holes are formed around the centralizing hole; the centralizing hole and the flow guide hole are through holes penetrating through the annular hole type centralizer; the upper end of the outer wall of the annular hole type centralizer is provided with a positioning thread used for being connected with an inlet pipe, and the lower end of the annular hole type centralizer is provided with a separation cavity sealing thread connected with a reducing separation pipe;
the reducing separation pipe is integrally cylindrical, and a separation cavity is formed in the reducing separation pipe and is formed by sequentially connecting a cylindrical section rotational flow cavity, a large cone cavity, a small cone cavity and an underflow cavity; the front end of the reducing separation pipe is connected with the annular ring type centralizer through a separation cavity seal thread;
the trestle type flow stabilizing unit comprises a flow stabilizing slide block, a flow stabilizing piece, a flow stabilizing connecting rod, a flow stabilizing spring and a fancy positioning ring; the outer wall of the steady flow sliding block is provided with a spiral positioning key in spiral arrangement, the center of the steady flow sliding block is provided with a circular sliding hole, and the overflow pipe penetrates through the circular sliding hole so as to realize the reciprocating motion between the overflow pipe and the steady flow sliding block; the integral structure of the current stabilizing sheet is fan-shaped, and the bottom of the current stabilizing sheet is provided with a positioning sheet which is used for being connected with a spiral positioning key pin key on the current stabilizing slide block; a clamping piece is arranged below the top of the current stabilizing piece and is used for being in pin joint connection with a double-hole clamping groove at the upper end of the current stabilizing connecting rod; the steady flow sheet can rotate around a pin between the positioning sheet at the bottom and the spiral positioning key, and the upper end and the lower end of the steady flow connecting rod can rotate around the pin at the connecting part of the end parts of the steady flow connecting rod;
the top end of the steady flow connecting rod is provided with a double-hole clamping groove, the bottom end of the steady flow sheet is provided with a single-hole positioning pin, and the steady flow sheet is connected with the fancy positioning ring through a positioning ring; the fancy positioning ring is formed by connecting a plurality of fancy positioning keys in a surrounding way, and a groove is formed in the center of each fancy positioning key and used for fixing the positioning ring;
the overflow pipe penetrates through the trestle type flow stabilizing unit, wherein the fancy positioning ring is connected with the overflow pipe through threads to realize fixation; the upper end of the steady flow spring is fixedly connected with the bottom of the steady flow sliding block, and the lower end of the steady flow spring is fixedly connected with the top of the fancy positioning ring and is subjected to telescopic deformation along with the reciprocating motion of the steady flow sliding block along the overflow pipe;
the trestle type flow stabilizing unit is positioned in the cylindrical section cyclone cavity, and the outer edges of the flow stabilizing pieces which are arranged in a spiral line shape are sequentially contacted with the inner wall of the cylindrical section cyclone cavity to form a radial sealing structure between the flow stabilizing pieces and the inner wall of the cylindrical section separation cavity;
the float-type voltage stabilizer comprises a rubber float, a voltage stabilizing spring and a liquid discharge base; the rubber floater is in a frustum shape and is arranged in a pressure stabilizing cavity at the top of the liquid drainage base, and the small conical surface of the rubber floater is fixedly connected with the upper end of a pressure stabilizing spring; the lower end of the pressure stabilizing spring is sleeved on the positioning round table at the axis of the liquid discharge base to complete the positioning of the pressure stabilizing spring; the liquid discharge base is integrally cylindrical, the top of the liquid discharge base is a pressure stabilizing cavity, the bottom of the liquid discharge base is provided with a plurality of penetrating liquid separation holes, and an annular outlet at the bottom of the liquid discharge base is a water phase outlet; the top of the liquid discharge base is provided with threads for being in threaded connection with the bottom of the reducing separation pipe.
The invention has the following beneficial effects: the invention is mainly applied to the same-well injection-production process developed under the condition of high water content of produced liquid in the later stage of oilfield exploitation, and is used for realizing the efficient separation of oil and water in a well. The device mainly comprises a reducing joint, an inlet pipe, an annular ring type centralizer, a trestle type flow stabilizer, a reducing separation pipe, a float type pressure stabilizer and the like. According to the invention, through organic combination among all mechanical structures, the liquid flow entering the reducing separation pipe is ensured to be stable through structural change of the trestle type flow stabilizer under the condition of unstable incoming liquid flow, so that efficient separation is completed. When the device is used, oil-water mixed liquid is impacted on a flow stabilizing sheet of a trestle type flow stabilizing device through a flow guide hole in the annular hole type centralizer inside an inlet pipe entering device, when the liquid amount is too large, the surface pressure of the flow stabilizing sheet is increased, so that a flow stabilizing slider axially compresses a flow stabilizing spring downwards, at the moment, under the shielding of the flow stabilizing sheet, the flowing area of the incoming liquid is reduced, the flow entering a reducing separation pipe is reduced, and the phenomena of low emulsification and separation efficiency and the like caused by too large flow can be avoided. In a similar way, when the liquid amount is too small, the opening of the flow stabilizing piece is increased, and the flow area is increased, so that the flow entering the reducing separation pipe is kept constant, and the flow can still keep better separation performance. The device has simple structure and reliable technology, does not need additional underground/aboveground adjustment, and is a mechanical self-operated adjusting device. The adverse effect of the separator on the separation effect caused by the change of the liquid yield of the oil well, the rise of the pressure of the reinjection layer, the change of the working efficiency of the lifting pump and the like is eliminated, so that the oil-water separation is always kept in the range of stable and efficient treatment capacity. Meanwhile, the trestle type downhole flow self-adaptive liquid-liquid separation device provided by the invention has the characteristics of simple treatment process, continuous operation, flexible and convenient use, small equipment volume, convenience in installation, low operation cost, energy conservation, consumption reduction and high separation efficiency, and can be used for separating two-phase media under the condition of unstable incoming liquid flow in different forms. The device has the advantages of being widely applied to the fields of petrochemical industry, metallurgy, water treatment and the like.
Description of the drawings:
FIG. 1 is a cross-sectional view of a trestle type downhole flow adaptive liquid-liquid separation device.
Fig. 2 is an appearance diagram of a trestle type downhole flow self-adaptive liquid-liquid separation device.
FIG. 3 is a view showing a structure of a reducing joint.
FIG. 4 is an external view of the reducer union.
Figure 5 inlet pipe block diagram.
FIG. 6 is a schematic view of the connection between the inlet pipe and the annular ring centralizer
FIG. 7 is a view of the connection of an inlet tube to an annular ring centralizer.
Figure 8 is an external view of the ring hole type centralizer.
FIG. 9 is a cross-sectional view of an annular ring centralizer.
Fig. 10 a cross-sectional view of a variable diameter shunt.
FIG. 11 is a schematic view of the connection of the reducing separation tube.
Fig. 12 is a structural illustration of a trestle type flow stabilizing unit.
Fig. 13 is a schematic structural view of a flow stabilizing slider.
Fig. 14 flow stabilizer block diagram.
Fig. 15 structure diagram of the flow stabilizing link.
Fig. 16 shows the connection mode of the positioning ring and the fancy positioning ring.
Figure 17 shows the structure of the fancy holding ring.
Figure 18 shows the fixing mode of the fancy positioning ring.
FIG. 19 is a schematic view of the connection between the trestle type flow stabilizer and the overflow pipe.
Fig. 20 illustrates an assembly of a trestle type flow stabilizer and an overflow tube.
Fig. 21 is a diagram of the installation position of the trestle type flow stabilizer.
FIG. 22 is a schematic view of a sealing arrangement.
Fig. 23 shows the flow stabilizer flap swung downward.
Fig. 24 is a combined transformation process diagram.
Fig. 25 is a combined detailed view of the deformation process.
FIG. 26 is a three-dimensional cross-sectional view of a float-type stabilizer.
FIG. 27 is a schematic diagram of a float regulator assembly.
Fig. 28 is a sectional view of the stabilizer base.
Fig. 29 is an external view of the stabilizer base.
Fig. 30 front end system overall assembly view.
FIG. 31 is a connection diagram of the float-type stabilizer and the reducing separation tube.
FIG. 32 is a schematic diagram of the main structural parameters.
Fig. 33 is a sizing view of the flow stabilizing link.
In the figure, 1-a mixed liquid inlet, 2-an oil phase outlet, 3-a water phase outlet, 4-a reducing joint, 401-an assembling hole, 402-an inlet sealing thread, 403-a positioning hole, 5-an inlet pipe, 6-a ring hole type centralizer, 601-a positioning thread, 602-a separating cavity sealing thread, 7-a trestle type flow stabilizing unit, 8-a reducing separating pipe, 801-a cylindrical section cyclone cavity, 802-a large cone cavity, 803-a small cone cavity, 804-a bottom flow cavity, 9-a float type flow stabilizer, 10-an overflow pipe, 11-a pipe cone thread, 12-a flow guide hole, 13-a stabilizing hole, 14-a separating cavity, 15-a flow stabilizing slide block, 16-a flow stabilizing sheet, 17-a flow stabilizing connecting rod, 18-a flow stabilizing spring and 19-a fancy positioning ring, 1901-positioning ring, 20-spiral positioning key, 21-sliding hole, 22-positioning piece, 23-clamping piece, 24-double-hole clamping groove, 25-single-hole positioning pin, 26-fancy positioning pin, 27-rubber floater, 28-pressure stabilizing spring, 29-liquid discharging base, 2901-pressure stabilizing cavity, 2902-positioning circular table and 30-liquid separating hole.
The specific implementation mode is as follows:
the invention will be further described with reference to the accompanying drawings in which:
the trestle type underground flow self-adaptive liquid-liquid separation device comprises a reducing joint 4, an inlet pipe 5, a ring type centralizer 6, a trestle type flow stabilizing unit 7, a reducing separation pipe 8, an overflow pipe 10 and a float type voltage stabilizer 9; the top end of the overflow pipe 10 is an oil phase outlet 2.
Wherein, the upper end of the reducer union 4 is provided with a pipe cone thread 11 for connecting with a downhole oil pipe, the lower end is provided with an inlet sealing thread 402 for connecting with the inlet pipe 5, the center is provided with a through hole, and the overflow pipe 10 penetrates through the through hole; the upper end of the reducer union 4 is provided with an assembling hole 401, the lower end of the reducer union 4 is provided with a positioning hole 403, and the overflow pipe 10 is positioned through an overflow pipe positioning thread 404.
The whole of inlet tube 5 is thin-walled cylinder structure, and it has a plurality of through-holes of evenly arranging to open on the pipe wall, a plurality of through-holes constitute and mix liquid entry 1, and the front end and the reducer union 4 of inlet tube 5 pass through threaded connection, and the rear end and the annular ring formula centralizer 6 of inlet tube 5 pass through threaded connection.
The annular ring type centralizer 6 is characterized in that the main body is a cylinder, a centralizing hole 13 penetrating through the axis is formed in the center of the cylinder along the axial direction, and a plurality of flow guide holes 12 are formed around the centralizing hole; the centralizing hole 13 and the diversion hole 12 are through holes penetrating through the annular hole type centralizer; the upper end of the outer wall of the annular hole type centralizer 6 is provided with a positioning thread 601 used for being connected with the inlet pipe 5, and the lower end of the annular hole type centralizer 6 is provided with a separation cavity sealing thread 602 connected with the reducing separation pipe 8.
The reducing separation pipe 8 is integrally cylindrical, a separation cavity 14 is formed in the reducing separation pipe, and the separation cavity is formed by sequentially connecting a cylindrical section cyclone cavity 801, a large cone cavity 802, a small cone cavity 803 and a bottom flow cavity 804; the front end of the reducing separation pipe 8 is connected with the annular ring type centralizer 6 through a separation cavity sealing thread 602.
The trestle type flow stabilizing unit 7 comprises a flow stabilizing slide block 15, a flow stabilizing sheet 16, a flow stabilizing connecting rod 17, a flow stabilizing spring 18 and a fancy positioning ring 19; the outer wall of the steady flow sliding block 15 is provided with a spiral positioning key 20 which is spirally arranged, the center of the steady flow sliding block 15 is provided with a circular slide hole 21, and the overflow pipe 10 penetrates through the circular slide hole 21 so as to realize the reciprocating motion between the overflow pipe 10 and the steady flow sliding block 15; the integral structure of the current stabilizing sheet 16 is fan-shaped, and the bottom of the current stabilizing sheet 16 is provided with a positioning sheet 22 which is used for being in pin key connection with a spiral positioning key 20 on the current stabilizing slide block 15; a clamping piece 23 is arranged below the top of the current stabilizing piece 16 and is used for being in pin key connection with a double-hole clamping groove 24 at the upper end of the current stabilizing connecting rod 17; the steady flow piece 16 can rotate around the pin between the positioning piece 22 at the bottom and the spiral positioning key 20, and the upper end and the lower end of the steady flow connecting rod 17 can rotate around the pin at the connection part of the end parts.
The top end of the steady flow connecting rod 17 is provided with a double-hole clamping groove 24, the bottom end of the steady flow sheet 16 is provided with a single-hole positioning pin 25, and the steady flow connecting rod is connected with the fancy positioning ring 19 through a positioning ring 1901; the fancy positioning ring 19 is formed by connecting a plurality of fancy positioning keys 26 in a surrounding way, and a groove is formed in the center of each fancy positioning key 26 and used for fixing the positioning ring 1901.
The overflow pipe 10 passes through the trestle type flow stabilizing unit 7, wherein the fancy positioning ring 19 is in threaded connection with the overflow pipe 10 to realize fixation; the upper end of the steady flow spring 18 is fixedly connected with the bottom of the steady flow slide block 15, the lower end of the steady flow spring 18 is fixedly connected with the top of the fancy positioning ring 19, and the steady flow spring is subjected to telescopic deformation along with the reciprocating motion of the steady flow slide block 15 along the overflow pipe 10.
The trestle type flow stabilizing unit 7 is positioned in the cylindrical section vortex cavity 801, and the outer edges of the flow stabilizing pieces 16 which are spirally arranged contact the inner wall of the cylindrical section vortex cavity 801 in sequence to form a radial sealing structure between the flow stabilizing pieces 16 and the inner wall of the cylindrical section separation cavity 801.
The float-type voltage stabilizer 9 comprises a rubber float 27, a voltage stabilizing spring 28 and a liquid discharge base 29; wherein, the rubber float 27 is frustum-shaped and is arranged in the pressure stabilizing cavity 2901 at the top of the liquid discharge base 29, and the small conical surface of the rubber float 27 is fixedly connected with the upper end of the pressure stabilizing spring 28; the lower end of the pressure stabilizing spring 28 is sleeved on a positioning circular truncated cone 2902 at the axis of the liquid discharge base 29 to complete the positioning of the pressure stabilizing spring 28; the liquid discharge base 29 is integrally cylindrical, the top part is a pressure stabilizing cavity 2901, the bottom part is provided with a plurality of liquid separation holes 30 which penetrate through, and the bottom annular outlet is a water phase outlet 3; the top of the liquid discharge base 29 is provided with threads for threaded connection with the bottom of the reducing separation pipe 8.
Fig. 1 is a sectional view of the device, and fig. 2 is an external view of the device. The cross-sectional view of the reducer union 4 is shown in fig. 3, the upper end of the reducer union is provided with a pipe taper thread 11 connected with a downhole oil pipe, the lower end of the reducer union is provided with an inlet sealing thread 402 connected with an inlet pipe 5, the center of the reducer union is provided with a through hole, an overflow pipe 10 penetrates through the through hole, the diameter of the upper end of the reducer union is larger than that of an assembly hole 401, the diameter of the lower end of the reducer union is smaller than that of a positioning hole 403. The reducer union 4 is a cylindrical reducer structure with a hole in the center, and the appearance of the cylindrical reducer union is shown in fig. 4. The structural form of the inlet pipe 5 is shown in figure 5, the whole body is of a thin-wall cylinder structure, a plurality of uniformly distributed through holes are formed in the same wall, namely, the mixed liquid inlet 1, the front end of the mixed liquid inlet is connected with the reducer union 4 through threads, the connection schematic diagram is shown in figure 6, the rear end of the mixed liquid inlet is connected with the annular hole type centralizer 6 through threads, and the connection mode is shown in figure 7. The ring-hole centralizer 6 is a cylindrical structure with a plurality of through holes formed inside, and the appearance diagram is shown in fig. 8. The center of the shaft is provided with a righting hole 13 which penetrates through the shaft center, and a plurality of annularly distributed flow guide holes 12 are arranged around the shaft center. The cross section is shown in fig. 9, it can be seen that the centralizing hole 13 and the diversion hole 12 both are through holes, and the upper end of the outer wall is provided with a positioning thread 601 connected with the inlet pipe 5, and the lower end of the outer wall is provided with a separation cavity sealing thread 602 connected with the reducing separation pipe. The reducing separation pipe 8 is cylindrical as a whole, the center of the reducing separation pipe is a reducing through hole, and the separation cavity 14 is formed by connecting a cylindrical section cyclone cavity 801, a large cone cavity 802, a small cone cavity 803 and a bottom flow cavity 804. The front end of the ring control type centralizer is connected with the ring control type centralizer 6 through a separation cavity sealing thread 602, and the connection schematic diagram is shown in fig. 11. The trestle type flow stabilizing unit 7 mainly comprises a flow stabilizing slider 15, a flow stabilizing sheet 16, a flow stabilizing connecting rod 17, a flow stabilizing spring 18 and a fancy positioning ring 19, and the integral connection diagram is shown in fig. 12. The structure of the steady flow slider 15 is shown in fig. 13, the whole structure is a circular tube structure, the outer wall of the steady flow slider is provided with spiral positioning keys 20 which are arranged spirally, the center of the steady flow slider is provided with a circular slide hole 21, the overflow pipe 10 penetrates through the circular slide hole 21, and the reciprocating motion between the overflow pipe 10 and the steady flow slider 15 can be realized. The structure of the steady flow piece 16 is shown in fig. 14, and the integral structure is provided with a positioning piece 22 at the fan-shaped bottom for pin-key connection with a spiral positioning key 20 on the steady flow slider 15. A clamping sheet 23 is arranged below the top and is used for pin-key connection with a double-hole clamping groove 24 at the upper end of the flow stabilizing connecting rod 17. The structure of the steady flow connecting rod 17 is shown in fig. 15, the top end is provided with a double-hole clamping groove 24, the bottom end is provided with a single-hole positioning pin 25, and the steady flow connecting rod is connected with the fancy positioning ring 19 through a positioning ring 1901, and the connection mode is shown in fig. 16. The fancy holding ring 19 is shown in fig. 17, and is formed by arranging a plurality of fancy holding keys 26 on the outer circumference of a round tube. The center of the fancy positioning key 26 is provided with a groove for fixing a positioning ring 1901, and the fixing mode is as shown in fig. 18. The chain connection mode of the trestle type flow stabilizer 7 and the overflow pipe 10 is shown in fig. 19, wherein a fancy positioning ring 19 is fixed with the overflow pipe 10 in a threaded manner, a flow stabilizing slide block 15 and the overflow pipe 10 can form reciprocating motion, a flow stabilizing sheet 16 can rotate around a pin between a positioning sheet 22 at the bottom and a spiral positioning key 20, and similarly, the upper end and the lower end of a connecting rod 17 can rotate around the pin at the connection position. The upper end of the steady flow spring 18 is fixedly connected with the bottom of the steady flow slide block 15, the lower end of the steady flow spring is fixedly connected with the top of the fancy positioning ring 19, and the steady flow spring is subjected to telescopic deformation along with the reciprocating motion of the steady flow slide block 15 along the overflow pipe 10. The assembly of the trestle type flow stabilizer 7 and the overflow tube 10 is shown in fig. 20, and the spirally arranged flow stabilizers 16 form a closed circular ring in the radial cross-sectional direction. The installation position of the trestle type flow stabilizing unit 7 is as shown in fig. 21, the positioning is completed through the overflow pipe 10 penetrating through the axis and the ring control type centralizer 6, and the positioning is mainly performed to the cylindrical section vortex cavity 801 in the reducing separation pipe 8 and is concentric with the reducing separation pipe 10. A radial sealing structure is formed between the flow stabilizing sheet 16 mounted on the rear trestle type flow stabilizing device 7 and the cylindrical section separation cavity 801 at the front end of the reducing separation pipe 8, as shown in fig. 22, along with the up-and-down swing of the flow stabilizing sheet 16, the flow stabilizing sheet 16 and the inner wall of the reducing separation pipe 8 present a changeable flow area, and as shown in fig. 23, the flow area is increased when the flow stabilizing sheet 16 swings downwards. The reciprocating movement of the flow stabilizing slider 15 along the overflow tube 10 and the combined deformation of the flow stabilizing piece 16 are shown in fig. 24 and 25.
Fig. 26 shows a three-dimensional cross-sectional view of the float-type pressurizer 9, which is mainly composed of three parts, namely a rubber float 27, a pressure stabilizing spring 28 and a liquid discharge base 29. The rubber float 27 is in the shape of a frustum, and the small conical surface is fixedly connected with the upper end of the pressure stabilizing spring 28 and is arranged in the pressure stabilizing cavity 2901 at the top of the liquid drainage base 29. The lower end of the pressure stabilizing spring 28 is sleeved on the positioning circular truncated cone 2902 at the axial center of the liquid discharge base 29, and the positioning of the pressure stabilizing spring 28 is completed, as shown in fig. 27. The liquid discharge base 29 is cylindrical as a whole, the top part is a pressure stabilizing cavity 2901, the bottom part is provided with a plurality of liquid separation holes 30 which penetrate through, the sectional view is shown in figure 28, and the bottom annulus is provided with a water phase outlet 3. The inner portion has a circular concave upper section as shown in fig. 29. The top of the float-type voltage stabilizer 9 is provided with threads for connecting with a front end system, the whole assembly drawing of the front end system is shown as figure 30, wherein the float-type voltage stabilizer 9 is in threaded connection with the bottom of the reducing separation pipe 8, and the fixing and sealing of the device are completed, as shown in figure 31.
When in use, the reducer union 4 is used for completing the matching connection with the underground process pipe column and simultaneously plays a role in righting and fixing the overflow pipe 10. The pre-separation medium enters the device from the mixed liquid inlet 1, the separated light phase is discharged out of the device from the oil phase outlet 2, and the heavy phase is discharged out of the device from the water phase outlet 3. The ring hole type centralizer 6 can be used for guiding incoming liquid to flow into a subsequent separation pipe section, and meanwhile, the overflow pipe 10 is centralized and positioned, so that the stability of the whole device is guaranteed. The trestle type flow stabilizing units 7 are spirally arranged, and can guide the incoming liquid flow to ensure that the liquid flow entering axially originally is in rotary motion when entering the reducing separation pipe 8 so as to provide centrifugal force required by separation. On the other hand, the flow stabilizing control of the incoming liquid can be carried out by adjusting the flow area of the incoming liquid along with the change of the size of the incoming liquid through the self structural characteristics. The reducing separation pipe 8 mainly functions to separate a mixed medium which is subjected to flow stabilization and tangential acceleration by the trestle type flow stabilization unit, and the light phase is ensured to smoothly enter the overflow pipe 10 and be discharged through the oil phase outlet by giving an axially upward pressure to the light phase through the double-cone structure design, so that the separation is completed. The water phase discharged from the end 8 of the reducing separation pipe is discharged after being subjected to pressure stabilization and liquid separation by the float-type pressure stabilizer. The connection between the reducer union 4 and the inlet pipe 5 is realized by connecting two structures through threads so as not to increase the radial dimension of the device, thereby ensuring the sealing and fastening of the device. And the guide holes 12 are annularly arranged and used for guiding liquid flow entering the inlet pipe 5 from the mixed liquid inlet 1 to flow through the trestle type flow stabilizer 7 along the guide holes 12 to finish flow stabilization. The righting hole 13 is used for righting the position of the overflow pipe, and the overflow pipe is prevented from vibrating and being eccentric to cause adverse effects on separation due to reasons such as liquid flow impact. The plurality of flow stabilizing sheets 16 in the trestle type flow stabilizing unit are the same in size but different in length of the flow stabilizing connecting rod 17, so that the flow stabilizing sheets are spirally arranged, liquid flow forms tangential rotating speed and enters the separation cavity 14, and separation is completed under the action of centrifugal force. Meanwhile, the bottom of the flow stabilizing slide block 15 is connected with a flow stabilizing spring 18, the side wall of the flow stabilizing slide block is connected with a flow stabilizing piece 16, when the incoming liquid volume is increased, the liquid flow impacts the flow stabilizing piece 16 to enable the flow stabilizing slide block 15 to compress the flow stabilizing spring 18 to move downwards, and meanwhile, the flow stabilizing piece 16 is driven to deflect, so that the flow area between the flow stabilizing piece 16 and the separation cavity 14 is reduced, and the flow of the mixed liquid entering the conical section of the separation cavity is controlled to be stable. Similarly, when the amount of the incoming liquid is reduced, the steady flow slider 15 moves upwards under the action of the steady flow spring 18, so that the flow area between the steady flow sheet and the separation cavity is increased, the liquid flow entering the separation cavity is kept stable, and the high-efficiency separation is completed. The spiral positioning pin 20 in the steady flow slide block 15 is used for being hinged with the steady flow piece, the slide hole 21 is used for enabling the steady flow slide block 15 to slide up and down along the overflow pipe, the positioning piece 22 is used for being connected with the spiral positioning key on the steady flow slide block 15, and the clamping piece is used for being connected with the steady flow connecting rod 17. After the incoming liquid impacts the flow stabilizing piece 16 from the upper end, the flow stabilizing piece 16 presses the flow stabilizing connecting rod 17 to move downwards under the action of pressure, and further pushes the fancy positioning ring 19 to move downwards axially, and the flow stabilizing spring 18 controls the fancy positioning ring 19 to reciprocate up and down along with the change of the volume of the incoming liquid, so that the flow area of an annular space formed by the flow stabilizing piece 16 is gradually changed. The float type pressure stabilizer 9 is mainly used for stabilizing the pressure at the bottom outlet of the reducing separation pipe, so as to ensure the efficient separation, namely, the bottom pressure is stabilized, the flow dividing ratio of the reducing separation pipe 8 is ensured to be at an optimal stable value, when the flow at the bottom flow outlet is increased, the rubber float 27 axially moves downwards under the action of the pressure, so that the radial flow area of the liquid flow is reduced, when the flow at the bottom flow outlet is reduced, the pressure stabilizing spring 28 pushes the rubber float 27 axially upwards, the flow area is increased, and the stability of the bottom outlet pressure of the integral device is ensured. The liquid discharge base 29 is provided with a liquid separation hole 30 for introducing the separated heavy liquid phase into the water phase outlet, and the discharge device completes the separation.
FIG. 32 is a drawing showing the dimension of the main structure of the trestle type downhole flow adaptive liquid-liquid separation device. Satisfies the following relation:
in the formula: number of openings in n-inlet pipe
FIG. 33 is a steady flow link dimension labeling diagram link dimension constraint relationship:
the blades are spirally distributed, and the length difference of adjacent connecting rods is L1-L2 = L2-L3 = …. = L9-L10 = h = lambda/n.
In the formula: h is the difference between the lengths of adjacent connecting rods;
λ -helical pitch;
n is the number of blades;
the device has been experimentally applied in oil fields. The results obtained confirm that: 1. the invention has simple treatment process and can realize stable continuous separation under the condition of changing the liquid amount; 2. by designing the flow stabilizing device before separation, the flow inside the device can be self-adapted without external power to control the flow, the liquid inlet amount is ensured to be always in a range suitable for separation, and the separation precision is ensured; 3. the equipment has small volume, convenient installation and low operating cost; 4. through the design of a pressure stabilizing device at the rear end of the separation, the device automatically adjusts the flow dividing ratio in the separation process to be always in the optimal state, and the separation is ensured to be carried out efficiently; 5. through the spiral design of the trestle type flow stabilizing unit, the shearing and crushing of the flow field to liquid drops are reduced, the tangential speed of a fluid medium is ensured, and the tangential power required by separation is ensured without external pressurization.
Claims (1)
1. A trestle type downhole flow self-adaptive liquid-liquid separation device comprises a reducing joint, an inlet pipe, a ring centralizer, a trestle type flow stabilizing unit, a reducing separation pipe, an overflow pipe and a float type voltage stabilizer; the top end of the overflow pipe is an oil phase outlet;
the upper end of the reducing joint is provided with a pipe cone thread for connecting with an underground oil pipe, the lower end of the reducing joint is provided with an inlet sealing thread for connecting with an inlet pipe, the center of the reducing joint is provided with a through hole, and the overflow pipe penetrates through the through hole; the upper end of the reducing joint is provided with an assembling hole, the lower end of the reducing joint is provided with a positioning hole, and the overflow pipe is positioned through an overflow pipe positioning thread;
the whole body of the inlet pipe is of a thin-wall cylindrical structure, a plurality of uniformly distributed through holes are formed in the pipe wall of the inlet pipe, the through holes form a mixed liquid inlet, the front end of the inlet pipe is connected with the reducing joint through threads, and the rear end of the inlet pipe is connected with the annular hole type centralizer through threads;
the main body of the ring hole type centralizer is a cylinder, a centralizing hole penetrating through the axis is formed in the center of the cylinder along the axial direction, and a plurality of flow guide holes are formed around the centralizing hole; the centralizing hole and the flow guide hole are through holes penetrating through the annular hole type centralizer; the upper end of the outer wall of the annular hole type centralizer is provided with a positioning thread for connecting with an inlet pipe, and the lower end of the annular hole type centralizer is provided with a separation cavity sealing thread for connecting with a reducing separation pipe;
the reducing separation pipe is integrally cylindrical, and a separation cavity is formed in the reducing separation pipe and is formed by sequentially connecting a cylindrical section rotational flow cavity, a large cone cavity, a small cone cavity and an underflow cavity; the front end of the reducing separation pipe is connected with the annular ring type centralizer through a separation cavity seal thread;
the trestle type flow stabilizing unit comprises a flow stabilizing slide block, a flow stabilizing piece, a flow stabilizing connecting rod, a flow stabilizing spring and a fancy positioning ring; the outer wall of the steady flow sliding block is provided with a spiral positioning key in spiral arrangement, the center of the steady flow sliding block is provided with a circular sliding hole, and the overflow pipe penetrates through the circular sliding hole so as to realize the reciprocating motion between the overflow pipe and the steady flow sliding block; the integral structure of the current stabilizing sheet is fan-shaped, and the bottom of the current stabilizing sheet is provided with a positioning sheet which is used for being connected with a spiral positioning key pin key on the current stabilizing slide block; a clamping piece is arranged below the top of the current stabilizing piece and is used for being in pin joint connection with a double-hole clamping groove at the upper end of the current stabilizing connecting rod; the steady flow sheet can rotate around a pin between the positioning sheet at the bottom and the spiral positioning key, and the upper end and the lower end of the steady flow connecting rod can rotate around the pin at the connecting part of the end parts of the steady flow connecting rod;
the top end of the steady flow connecting rod is provided with a double-hole clamping groove, and the bottom end of the steady flow connecting rod is provided with a single-hole positioning pin which is connected with the fancy positioning ring through a positioning ring; the fancy positioning ring is formed by connecting a plurality of fancy positioning keys in a surrounding way, and a groove is formed in the center of each fancy positioning key and used for fixing the positioning ring;
the overflow pipe penetrates through the trestle type flow stabilizing unit, wherein the fancy positioning ring is connected with the overflow pipe through threads to realize fixation; the upper end of the steady flow spring is fixedly connected with the bottom of the steady flow sliding block, and the lower end of the steady flow spring is fixedly connected with the top of the fancy positioning ring and is subjected to telescopic deformation along with the reciprocating motion of the steady flow sliding block along the overflow pipe;
the trestle type flow stabilizing unit is positioned in the cylindrical section cyclone cavity, and the outer edges of the flow stabilizing pieces which are arranged in a spiral line shape are sequentially contacted with the inner wall of the cylindrical section cyclone cavity to form a radial sealing structure between the flow stabilizing pieces and the inner wall of the cylindrical section separation cavity;
the float-type voltage stabilizer comprises a rubber float, a voltage stabilizing spring and a liquid discharge base; the rubber floater is in a frustum shape and is arranged in a pressure stabilizing cavity at the top of the liquid drainage base, and the small conical surface of the rubber floater is fixedly connected with the upper end of a pressure stabilizing spring; the lower end of the pressure stabilizing spring is sleeved on the positioning round table at the axis of the liquid discharge base to complete the positioning of the pressure stabilizing spring; the liquid discharge base is integrally cylindrical, the top of the liquid discharge base is a pressure stabilizing cavity, the bottom of the liquid discharge base is provided with a plurality of penetrating liquid separation holes, and an annular outlet at the bottom of the liquid discharge base is a water phase outlet; the top of the liquid discharge base is provided with threads for being in threaded connection with the bottom of the reducing separation pipe.
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| CN201810263352.4A CN108561116B (en) | 2018-03-28 | 2018-03-28 | Trestle type downhole flow self-adaptive liquid-liquid separation device |
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| CN110173253A (en) * | 2019-04-30 | 2019-08-27 | 大庆油田有限责任公司 | Down-hole multilevel liquid stream self-rotation high-precision oily-water seperating equipment |
| CN110566394B (en) * | 2019-09-08 | 2020-08-25 | 东北石油大学 | Reciprocating type pipe diameter self-adaptation is power generation facility in pit |
| CN112240193B (en) * | 2020-11-17 | 2022-05-31 | 东北石油大学 | Multistage oil-water separation and same-well injection-production device in horizontal shaft |
| CN113617544B (en) * | 2021-08-10 | 2023-02-21 | 东北石油大学 | Automatic shunting cyclone separation device |
| CN114798200B (en) * | 2022-04-11 | 2023-04-25 | 东北石油大学 | Viscosity reduction coalescence integrated cyclone separation device |
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