CN108331572A - Gas-liquid separation re-injection oil extraction system and its method under Horizontal Well - Google Patents
Gas-liquid separation re-injection oil extraction system and its method under Horizontal Well Download PDFInfo
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- CN108331572A CN108331572A CN201810032637.7A CN201810032637A CN108331572A CN 108331572 A CN108331572 A CN 108331572A CN 201810032637 A CN201810032637 A CN 201810032637A CN 108331572 A CN108331572 A CN 108331572A
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- 238000000926 separation method Methods 0.000 title claims abstract description 127
- 238000002347 injection Methods 0.000 title claims abstract description 85
- 239000007924 injection Substances 0.000 title claims abstract description 85
- 239000007788 liquid Substances 0.000 title claims abstract description 85
- 238000000605 extraction Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title abstract description 14
- 230000005484 gravity Effects 0.000 claims abstract description 52
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 7
- 238000007667 floating Methods 0.000 claims description 40
- 239000012530 fluid Substances 0.000 claims description 7
- 238000012163 sequencing technique Methods 0.000 claims description 3
- 238000011084 recovery Methods 0.000 abstract description 6
- 238000005213 imbibition Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 238000011161 development Methods 0.000 abstract description 2
- 239000013589 supplement Substances 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 238000010586 diagram Methods 0.000 description 5
- 239000003129 oil well Substances 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000007872 degassing Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000638 stimulation Effects 0.000 description 2
- 238000005119 centrifugation Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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
- E21B43/34—Arrangements for separating materials produced by the well
- E21B43/38—Arrangements for separating materials produced by the well in the well
- E21B43/385—Arrangements for separating materials produced by the well in the well by reinjecting the separated materials into an earth formation in the same well
-
- 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
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Abstract
The present invention relates to gas-liquid separation re-injection oil extraction systems under a kind of Horizontal Well, including piece-rate system and re-injection system, the piece-rate system to be connect with the re-injection system, and the two is arranged in the oil sets annular space under Horizontal Well；The piece-rate system is made of Gravity Separation area and rotational flow separation region, and the Gravity Separation area and the rotational flow separation region are parallel with horizontal plane.The invention further relates to gas-liquid separation re-injection oil production methods under a kind of Horizontal Well, include the following steps：Produced Liquid passes through Gravity Separation in Gravity Separation area；Produced Liquid is further detached in rotational flow separation region using centrifugal force；To stratum, the liquid isolated is produced to ground the gas isolated for re-injection after turbo-compressor increase.In compact oil reservoir development process, strata pressure can be maintained the 80% of original formation pressure by system and method using the present invention, equably supplement strata pressure, reinforce imbibition, and oil recovery amount at least improves 20%.
Description
Technical field
The invention belongs to Reservoir Development technical fields, and in particular to gas-liquid separation re-injection is recovered the oil system under a kind of Horizontal Well
System and its method.
Background technology
It is that the common one kind of Oil Field is retentively laminated by the gas separation and re-injection of output in compact oil reservoir exploitation
Power and the mode for handling associated gas.Fine and close oil belongs to light oil, and dissolved gas oil ratio is high, therefore the tolerance of output is larger.For position
In remote districts, for the fine and close oil well of no gas line network, output gas is vented burning mostly, is not recycled profit preferably
With.
Currently, the re-injection for output gas, main method is to exploit formation fluid to ground, by separation and then
By output gas re-injection to stratum.Although this method can realize the recycling of output gas, for the higher water of gas production
For horizontal well, since flow resistance is larger simultaneously for gas-liquid, it is therefore desirable to which larger pressure difference could be produced to ground, if using machine
The mode of pumping produces, larger greatly to reduce piston efficiency into gas liquid ratio, or even the case where liquid can occur, it is seen that realizes
Underground gas-liquid separation, water-oil separating and re-injection are of great significance to the exploitation of compact oil reservoir.
Invention content
To solve problems of the prior art, the present invention provides gas-liquid separation re-injection under a kind of Horizontal Well and recovers the oil system
System, including piece-rate system and re-injection system, the piece-rate system is connect with the re-injection system, and the two is arranged at horizontal well
In the oil sets annular space of underground；The piece-rate system is made of Gravity Separation area and rotational flow separation region, the Gravity Separation area
It is parallel with horizontal plane with the rotational flow separation region.
Gravity Separation area and rotational flow separation region are parallel with horizontal plane, are not necessarily to designed inclination angle, such design structure is to boring
Well requires low, and oil pipe, separator, note is facilitated the devices tripping in such as to adopt；For compact oil reservoir, Discharge rate is little, usually less than
10m3/d, parallel pit shaft realize Gravity Separation effect enough.
If strata pressure is low, gas production is higher, then Gravity Separation plays a major role, and cyclonic separation helps out, gas
Mainly pass through Gravity Separation.If strata pressure is high, gas production is relatively low, and cyclonic separation plays a major role, and is detached using centrifugation means
Go out the solution gas in liquid；In addition, cyclonic separation can handle due to Gravity Separation is not thorough and remaining gas, realize two fractions
From separation is more thorough.
Preferably, packer is respectively set in the both ends of the piece-rate system；The Gravity Separation area and the eddy flow point
From the position that area is connected, packer is set；Packer is arranged close to the one end on ground in the re-injection system.
In any of the above-described scheme preferably, the one end in the Gravity Separation area is arranged inlet tube I, the other end be arranged into
Liquid pipe II；The inlet tube I is connect with the oil pipe of horizontal well, and the inlet tube II is connect with the rotational flow separation region.
In any of the above-described scheme preferably, gas collecting apparatus is arranged in the upper left corner area in the Gravity Separation area；It is described
Gas collecting apparatus is connect with gas collecting tube I；The gas collecting tube I is connect by box cupling with escape pipe；The escape pipe and the re-injection system
System connection.
In any of the above-described scheme preferably, the gas collecting apparatus includes gas gathering mask, plenum chamber, floating body；The collection
Gas tank is arranged in the tail portion of the gas gathering mask；The floating body is arranged in the plenum chamber；The peak of the gas gathering mask with
The top in the Gravity Separation area contacts.
The major function of gas gathering mask is the gas collection that will be isolated；Floating body can be suspended in liquid, to
Barrier liquid enters in gas collecting tube I.The centre of floating body is hollow-core construction, the through-hole that hollow area passes through two a diameter of 1cm
It is communicated with outside, the purpose for designing such structure is that the global density for making floating body is slightly less than liquid, to ensure gas-liquid point
From it can adapt to the continually changing Produced Liquid of density, have extremely strong live adaptability.
In any of the above-described scheme preferably, fixing axle is set between the bottom surface and top surface of the plenum chamber；It is described solid
Dead axle passes through the floating body；The floating body is moved up and down along the fixing axle, automatically adjusts the air inlet of gas collecting tube I
Aperture, to which gas and liquid to be automatically separated out.
In any of the above-described scheme preferably, the length of the plenum chamber is 10cm, width 5cm, is highly 10cm；
The length of the floating body is 10cm, width 5cm, is highly 5cm.
In any of the above-described scheme preferably, the floating body is hollow structure；The wall thickness of floating body top surface is
The wall thickness of 1cm, other faces are 0.5cm.
In any of the above-described scheme preferably, the bottom surface of the floating body is arranged through-hole I, the through-hole I it is a diameter of
1cm；Through-hole II, a diameter of 1cm of the through-hole II is arranged towards the side of gas gathering mask in the floating body.
In any of the above-described scheme preferably, the floating body is made of low-density materials, density 0.1g/cm3.
In any of the above-described scheme preferably, cyclone separator is set in the rotational flow separation region；The cyclonic separation
One end of device is connect by inlet tube II with the Gravity Separation area, and gas collecting tube II is arranged in the other end of the eddy flow current divider；
The gas collecting tube II is connect by box cupling with escape pipe；The escape pipe is connect with the re-injection system.
In any of the above-described scheme preferably, outlet tube, the outlet tube and institute is arranged in the lower section of the gas collecting tube II
State oil sets annular space connection.
In any of the above-described scheme preferably, it is arranged back in the lower section in the Gravity Separation area and the rotational flow separation region
Note pipe；One end of the re-injection pipe is connect with the re-injection system, and the other end extends in fracturing stratum.
In any of the above-described scheme preferably, the re-injection system includes motor, turbo-compressor；The turbo-compressor
The arrival end of machine is connect with the escape pipe, and the outlet end of the turbo-compressor is connected to by box cupling with the re-injection pipe.It returns
After the liquid that Gravity Separation and cyclonic separation come out is pressurized by injection system by turbo-compressor, then by re-injection pipe it is recycled into ground
In layer, it to be used for fractured horizontal well.
The present invention also provides gas-liquid separation re-injection oil production methods under a kind of Horizontal Well, include following according to sequencing
Step：
Step 1：In the earth formation by horizontal well arrangement；In producing initial stage, using natural energy to horizontal wells for a period of time,
Until the bottom pressure of horizontal well drops to bubble point pressure；
Step 2：Gas-liquid separation re-injection system is put into the oil sets annular space under Horizontal Well, and by inlet tube I with it is horizontal
The oil pipe of well connects；
Step 3：Produced Liquid enters Gravity Separation area by inlet tube I, and after Gravity Separation, the air containing fluid on upper layer enters
Gas collecting apparatus；Floating body is suspended in liquid, and the aperture of adjust automatically air inlet makes the portion gas enter in gas collecting tube I；It should
Portion gas passes through gas collecting tube I and escape pipe successively, and pressurized treatment is carried out subsequently into turbo-compressor；Gas after supercharged from
The outlet end of turbo-compressor is flowed out, and is entered stratum by re-injection pipe and carried out pressure break；
Step 4：In Gravity Separation area after Gravity Separation, the air containing fluid of lower layer is entered by inlet tube II to be revolved Produced Liquid
Separation further detaches, and being dissolved in the gas in liquid using centrifugal force separates；The portion gas passes through successively
Gas collecting tube II and escape pipe carry out pressurized treatment subsequently into turbo-compressor；Gas after supercharged goes out from turbo-compressor
The outflow of mouth end, and stratum is entered by re-injection pipe and carries out pressure break；
Step 5：Entered in oil sets annular space by outlet tube in the liquid that rotational flow separation region is isolated, then passes through oil pipe
It produces to ground.
Preferably, in step 1, the horizontal well is any multi-stage water power pressure break horizontal well.Oil production method includes seam
Between interval water flood recovery, interval cyclic water stimulation recovers the oil between seam, water flood recovery, asynchronous note are adopted simultaneously at interval between seam.
In any of the above-described scheme preferably, in step 2, the gas-liquid separation re-injection system is any of the above-described institute
Gas-liquid separation re-injection oil extraction system under the Horizontal Well stated.
Producing initial stage, strata pressure is high, and Produced Liquid hardly deaerates, and is not necessarily to tripping in gas-liquid separation re-injection system at this time.When
Start a large amount of degassings when strata pressure is down near bubble point, in the pit shaft of horizontal well, is needed at this time by gas-liquid separation re-injection system
In tripping in stratum.Produced Liquid becomes gas-liquid two-phase by Gravity Separation, cyclonic separation, and separation gas, which is passed through turbo-compressor, to be increased
Pressure, supercharging amplitude are maintained above strata pressure 3-5MPa, are then injected in stratum by re-injection pipe.
The present invention Horizontal Well under gas-liquid separation re-injection oil extraction system and its method, it is simple, convenient, energy consumption it is low, can profit
Produced Liquid is detached in underground with gravity and centrifugal force, is pressurized in underground, while being forced by horizontal well multi-level water
Crack realizes that continuous note is adopted and a variety of oil production methods such as adopts with asynchronous note.Produced gas and water re-injection not only solve ground sewage
The problem of processing, is also effectively utilized associated gas, increases the economic benefit of the fine and close oil well in remote districts.It was developed in compact oil reservoir
Strata pressure can be maintained the 80% of original formation pressure, equably supplemented by Cheng Zhong, system and method using the present invention
Strata pressure, reinforces imbibition, and oil recovery amount at least improves 20%.
Description of the drawings
Fig. 1 is the signal of a preferred embodiment of gas-liquid separation re-injection oil extraction system under Horizontal Well according to the invention
Figure；
Fig. 2 is the Gravity Separation of the embodiment illustrated in fig. 1 of gas-liquid separation re-injection oil extraction system under Horizontal Well according to the invention
The schematic diagram of system；
Fig. 3 is the gas collecting apparatus of the embodiment illustrated in fig. 1 of gas-liquid separation re-injection oil extraction system under Horizontal Well according to the invention
Schematic diagram；
Fig. 4 is the plenum chamber of the embodiment illustrated in fig. 1 of gas-liquid separation re-injection oil extraction system under Horizontal Well according to the invention
Schematic diagram；
Fig. 5 is the floating body of the embodiment illustrated in fig. 1 of gas-liquid separation re-injection oil extraction system under Horizontal Well according to the invention
Schematic diagram；
Fig. 6 is the injected system of the embodiment illustrated in fig. 1 of gas-liquid separation re-injection oil extraction system under Horizontal Well according to the invention
Schematic diagram.
Explanation is marked in figure：
1- piece-rate systems, 101- Gravity Separations area, 102- rotational flow separation regions, 103- inlet tubes I, 104- inlet tubes II, 105- collection
Device of air, 106- gas collecting tubes I, 107- escape pipes, 108- gas gathering masks, 109- plenum chambers, 110- floating bodies, 111- fixing axles,
112- air inlets, 113- through-holes I, 114- through-holes II, 115- cyclone separators, 116- gas collecting tubes II, 117- outlet tubes；
2- re-injection systems, 201- motors, 202- turbo-compressor, 203- arrival ends, the outlet ends 204-, 205- re-injection pipes；
3- oil sets annular spaces；
4- packers；
5- box cuplings.
Specific implementation mode
In order to be further understood that the invention content of the present invention, the present invention is elaborated below in conjunction with specific embodiment.
As shown in figures 1 to 6, gas-liquid separation re-injection oil extraction system under Horizontal Well according to the invention, including piece-rate system 1
With re-injection system 2, the piece-rate system 1 is connect with the re-injection system 2, and the two is arranged at the oil jacket ring under Horizontal Well
In shape space 3；The piece-rate system 1 is made of Gravity Separation area 101 and rotational flow separation region 102,101 He of Gravity Separation area
The rotational flow separation region 102 is parallel with horizontal plane.
Packer 4 is respectively set in the both ends of the piece-rate system 1；The Gravity Separation area 101 and the rotational flow separation region
The 102 position setting packers 4 being connected；Packer 4 is arranged close to the one end on ground in the re-injection system 2.The gravity point
Inlet tube I 103 is arranged in one end from area 101, and inlet tube II 104 is arranged in the other end；The oil of the inlet tube I 103 and horizontal well
Pipe connects, and the inlet tube II 104 is connect with the rotational flow separation region 102.
Gas collecting apparatus 105 is arranged in the upper left corner area in the Gravity Separation area 101；The gas collecting apparatus 105 and gas collecting tube I
106 connections；The gas collecting tube I 106 is connect by box cupling 5 with escape pipe 107；The escape pipe 107 connects with the re-injection system 2
It connects.
The gas collecting apparatus 105 includes gas gathering mask 108, plenum chamber 109, floating body 110；The setting of the plenum chamber 109 exists
The tail portion of the gas gathering mask 108；The floating body 110 is arranged in the plenum chamber 109；The peak of the gas gathering mask 108
It is contacted with the top in the Gravity Separation area 101.Fixing axle 111 is set between the bottom surface and top surface of the plenum chamber 109；It is described
Fixing axle 111 passes through the floating body 110；The floating body 110 is moved up and down along the fixing axle 111, automatic adjustment collection
The aperture of the air inlet 112 of tracheae I 106, to which gas and liquid to be automatically separated out.The floating body is by low-density materials system
At density 0.1g/cm3.
The length of the plenum chamber 109 is 10cm, width 5cm, is highly 10cm；The length of the floating body 110 is
10cm, width 5cm, highly it is 5cm.The floating body 110 is hollow structure；The wall thickness of 110 top surface of floating body is
The wall thickness of 1cm, other faces are 0.5cm.The bottom surface of the floating body 110 is arranged through-hole I 113, the through-hole I 113 it is a diameter of
1cm；Through-hole II 114, a diameter of 1cm of the through-hole II 114 is arranged towards the side of gas gathering mask 109 in the floating body 110.It is logical
The position coordinates in hole I 113 are（1.25,0,5）；The position coordinates of through-hole II 114 are（5,2.5,5）.
The major function of gas gathering mask is the gas collection that will be isolated；Floating body can be suspended in liquid, to
Barrier liquid enters in gas collecting tube I.The centre of floating body is hollow-core construction, the through-hole that hollow area passes through two a diameter of 1cm
It is communicated with outside, the purpose for designing such structure is that the global density for making floating body is slightly less than liquid, to ensure gas-liquid point
From it can adapt to the continually changing Produced Liquid of density, have extremely strong live adaptability.
Cyclone separator 115 is set in the rotational flow separation region 102；One end of the cyclone separator 115 passes through feed liquor
Pipe II 104 is connect with the Gravity Separation area 101, and gas collecting tube II 116 is arranged in the other end of the eddy flow current divider 115；It is described
Gas collecting tube II 116 is connect by box cupling 5 with escape pipe 107；The escape pipe 107 is connect with the re-injection system 2.The gas collection
Outlet tube 117 is arranged in the lower section of pipe II 116, and the outlet tube 117 is connected to the oil sets annular space 3.In the gravity point
From area 101 and the lower section of the rotational flow separation region 102 setting re-injection pipe 205；One end of the re-injection pipe 205 and the re-injection system
2 connection of system, the other end extend in fracturing stratum.
The re-injection system 2 includes motor 201, turbo-compressor 202；The arrival end 203 of the turbo-compressor 202 with
The escape pipe 107 connects, and the outlet end 204 of the turbo-compressor 202 is connected to by box cupling 5 with the re-injection pipe 205.It returns
After the liquid that Gravity Separation and cyclonic separation come out is pressurized by injection system by turbo-compressor, then by re-injection pipe it is recycled into ground
In layer, it to be used for fractured horizontal well.
The present embodiment also provides gas-liquid separation re-injection oil production method under a kind of Horizontal Well, according to sequencing include with
Lower step：
Step 1：In the earth formation by horizontal well arrangement；In producing initial stage, using natural energy to horizontal wells for a period of time,
Until the bottom pressure of horizontal well drops to bubble point pressure；
Step 2：Gas-liquid separation re-injection system is put into the oil sets annular space under Horizontal Well, and by inlet tube I with it is horizontal
The oil pipe of well connects；
Step 3：Produced Liquid enters Gravity Separation area by inlet tube I, and after Gravity Separation, the air containing fluid on upper layer enters
Gas collecting apparatus；Floating body is suspended in liquid, and the aperture of adjust automatically air inlet makes the portion gas enter in gas collecting tube I；It should
Portion gas passes through gas collecting tube I and escape pipe successively, and pressurized treatment is carried out subsequently into turbo-compressor；Gas after supercharged from
The outlet end of turbo-compressor is flowed out, and is entered stratum by re-injection pipe and carried out pressure break；
Step 4：In Gravity Separation area after Gravity Separation, the air containing fluid of lower layer is entered by inlet tube II to be revolved Produced Liquid
Separation further detaches, and being dissolved in the gas in liquid using centrifugal force separates；The portion gas passes through successively
Gas collecting tube II and escape pipe carry out pressurized treatment subsequently into turbo-compressor；Gas after supercharged goes out from turbo-compressor
The outflow of mouth end, and stratum is entered by re-injection pipe and carries out pressure break；
Step 5：Entered in oil sets annular space by outlet tube in the liquid that rotational flow separation region is isolated, then passes through oil pipe
It produces to ground.
In step 1, the horizontal well is any multi-stage water power pressure break horizontal well.Oil production method includes interval note between seam
Interval cyclic water stimulation recovers the oil between hydromining oil, seam, water flood recovery, asynchronous note are adopted simultaneously at interval between seam.The pit shaft length of horizontal well
For 60m.
In step 2, the gas-liquid separation re-injection system recovers the oil for gas-liquid separation re-injection under the Horizontal Well of the present embodiment is
System.The length in Gravity Separation area is 30m.
Producing initial stage, strata pressure is high, and Produced Liquid hardly deaerates, and is not necessarily to tripping in gas-liquid separation re-injection system at this time.When
Start a large amount of degassings when strata pressure is down near bubble point, in the pit shaft of horizontal well, is needed at this time by gas-liquid separation re-injection system
In tripping in stratum.Produced Liquid becomes gas-liquid two-phase by Gravity Separation, cyclonic separation, and separation gas, which is passed through turbo-compressor, to be increased
Pressure, supercharging amplitude are maintained above strata pressure 3-5MPa, are then injected in stratum by re-injection pipe.
Gas-liquid separation re-injection oil extraction system and its method under the Horizontal Well of the present embodiment, it is simple, convenient, energy consumption it is low, can
Produced Liquid is detached in underground using gravity and centrifugal force, is pressurized in underground, while by horizontal well multi-stage water power
Fracturing fracture realizes that continuous note is adopted and a variety of oil production methods such as adopts with asynchronous note.Produced gas and water re-injection not only solve ground dirt
The problem of water process, is also effectively utilized associated gas, increases the economic benefit of the fine and close oil well in remote districts.It is developed in compact oil reservoir
In the process, strata pressure can be maintained to the 80% of original formation pressure using the system and method for the present embodiment, equably mended
Strata pressure has been filled, imbibition is reinforced, oil recovery amount at least improves 20%.
It will be apparent to those skilled in the art that gas-liquid separation re-injection oil extraction system and its method under the Horizontal Well of the present invention
Each section shown by invention content and specific embodiment part and attached drawing including aforementioned present invention specification it is arbitrary
Combination describes one by one as space is limited and for each scheme for keeping specification concise without constituting these combinations.It is all in the present invention
Spirit and principle within, any modification, equivalent substitution, improvement and etc. done, should be included in protection scope of the present invention it
It is interior.
Claims (10)
1. gas-liquid separation re-injection oil extraction system under a kind of Horizontal Well, including piece-rate system and re-injection system, the piece-rate system
It is connect with the re-injection system, and the two is arranged in the oil sets annular space under Horizontal Well, it is characterised in that：Described point
It is made of Gravity Separation area and rotational flow separation region from system, the Gravity Separation area and the rotational flow separation region are flat with horizontal plane
Row.
2. gas-liquid separation re-injection oil extraction system under Horizontal Well as described in claim 1, it is characterised in that：The piece-rate system
Both ends packer is respectively set；Packer is arranged in the position that the Gravity Separation area is connected with the rotational flow separation region；Institute
It states re-injection system and packer is set close to the one end on ground.
3. gas-liquid separation re-injection oil extraction system under Horizontal Well as claimed in claim 2, it is characterised in that：The Gravity Separation
Inlet tube I is arranged in the one end in area, and inlet tube II is arranged in the other end；The inlet tube I is connect with the oil pipe of horizontal well, the feed liquor
Pipe II is connect with the rotational flow separation region.
4. gas-liquid separation re-injection oil extraction system under Horizontal Well as claimed in claim 3, it is characterised in that：The Gravity Separation
Gas collecting apparatus is arranged in the upper left corner area in area；The gas collecting apparatus is connect with gas collecting tube I；The gas collecting tube I by box cupling with go out
Tracheae connects；The escape pipe is connect with the re-injection system.
5. gas-liquid separation re-injection oil extraction system under Horizontal Well as claimed in claim 4, it is characterised in that：The gas collecting apparatus
Including gas gathering mask, plenum chamber, floating body；The plenum chamber is arranged in the tail portion of the gas gathering mask；The floating body is arranged in institute
It states in plenum chamber；It is contacted at the top of the peak of the gas gathering mask and the Gravity Separation area.
6. gas-liquid separation re-injection oil extraction system under Horizontal Well as claimed in claim 5, it is characterised in that：The plenum chamber
Fixing axle is set between bottom surface and top surface；The fixing axle passes through the floating body；The floating body is along in the fixing axle
Lower movement automatically adjusts the aperture of the air inlet of gas collecting tube I.
7. gas-liquid separation re-injection oil extraction system under Horizontal Well as claimed in claim 6, it is characterised in that：The plenum chamber
Length is 10cm, width 5cm, is highly 10cm；The length of the floating body is 10cm, width 5cm, is highly 5cm.
8. gas-liquid separation re-injection oil extraction system under Horizontal Well as claimed in claim 7, it is characterised in that：The floating body is
Hollow structure；The wall thickness of floating body top surface is 1cm, and the wall thickness in other faces is 0.5cm.
9. gas-liquid separation re-injection oil extraction system under Horizontal Well as claimed in claim 8, it is characterised in that：The floating body
Through-hole I, a diameter of 1cm of the through-hole I is arranged in bottom surface；Through-hole II is arranged towards the side of gas gathering mask in the floating body, described
A diameter of 1cm of through-hole II.
10. gas-liquid separation re-injection oil production method, includes the following steps according to sequencing under a kind of Horizontal Well：
Step 1：In the earth formation by horizontal well arrangement；In producing initial stage, using natural energy to horizontal wells for a period of time,
Until the bottom pressure of horizontal well drops to bubble point pressure；
Step 2：Gas-liquid separation re-injection system is put into the oil sets annular space under Horizontal Well, and by inlet tube I with it is horizontal
The oil pipe of well connects；
Step 3：Produced Liquid enters Gravity Separation area by inlet tube I, and after Gravity Separation, the air containing fluid on upper layer enters
Gas collecting apparatus；Floating body is suspended in liquid, and the aperture of adjust automatically air inlet makes the portion gas enter in gas collecting tube I；It should
Portion gas passes through gas collecting tube I and escape pipe successively, and pressurized treatment is carried out subsequently into turbo-compressor；Gas after supercharged from
The outlet end of turbo-compressor is flowed out, and is entered stratum by re-injection pipe and carried out pressure break；
Step 4：In Gravity Separation area after Gravity Separation, the air containing fluid of lower layer is entered by inlet tube II to be revolved Produced Liquid
Separation further detaches, and being dissolved in the gas in liquid using centrifugal force separates；The portion gas passes through successively
Gas collecting tube II and escape pipe carry out pressurized treatment subsequently into turbo-compressor；Gas after supercharged goes out from turbo-compressor
The outflow of mouth end, and stratum is entered by re-injection pipe and carries out pressure break；
Step 5：Entered in oil sets annular space by outlet tube in the liquid that rotational flow separation region is isolated, then passes through oil pipe
It produces to ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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