CN203948078U - The non-mixed phase air water of a kind of low-permeability oil deposit is handed over note fluctuation step-down augmented injection device - Google Patents
The non-mixed phase air water of a kind of low-permeability oil deposit is handed over note fluctuation step-down augmented injection device Download PDFInfo
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Abstract
本实用新型公开一种低渗透油藏非混相气水交注波动降压增注装置，该装置主要包括地面注气、液装置和井底气水交注波动降压增注装置，所述注气、液装置主要包括地面的低温高压液态储罐、配液罐与柱塞泵；所述气水交注波动降压增注装置包括混合流体加速进口段、碰撞体、壳体以及混合流体出口段；该装置利用气体和液体弹性模量差异及重力分异的作用，来实现低渗透油藏非混相气驱过程中气水交注、注液波动降压增注和非混相气泡沫防窜功能的相互转换，从而提高注入效率，改善“气窜”现象。该装置结构简单，施工方法简便，作业费用低；可依据注入压力实时调整作业工艺，有效改善吸气(液)效果，大幅提高低渗透油藏非混相气驱的生产效率。
The utility model discloses a low-permeability oil reservoir immiscible gas-water cross-injection fluctuating pressure-reducing and increasing-injection device. The liquid device mainly includes a low-temperature and high-pressure liquid storage tank on the ground, a liquid distribution tank and a plunger pump; the gas-water cross-injection fluctuating depressurization and increasing injection device includes a mixed fluid acceleration inlet section, a collision body, a shell, and a mixed fluid outlet section ;The device uses the difference in elastic modulus between gas and liquid and the effect of gravity differentiation to realize the functions of gas-water cross-injection, liquid injection fluctuation, pressure reduction and injection, and immiscible gas foam anti-channeling during the process of immiscible gas flooding in low-permeability reservoirs Mutual conversion, so as to improve the injection efficiency and improve the "gas channeling" phenomenon. The device has simple structure, convenient construction method, and low operating cost; the operating process can be adjusted in real time according to the injection pressure, effectively improving the gas (liquid) suction effect, and greatly improving the production efficiency of immiscible gas flooding in low-permeability reservoirs.
Description
Technical field
The utility model relates to a kind of Oil-Gas Field Development Engineering technical field, be specifically related to the non-mixed phase air water of low-permeability oil deposit and hand over note fluctuation step-down augmented injection process, be a kind of gas, the difference of liquid elasticity of fluid modulus and principle of gravitational differentiation utilized, realize the device that in low-permeability oil deposit immiscible drive-gas displacement process, air water hands over note, fluid injection fluctuation step-down augmented injection and non-mixed phase gas foam anti-channeling function mutually to change.
Background technology
Immiscible drive-gas displacement is that one of low permeability oil field effectively improves recovery ratio and widely used development technique.But because the pore throat architectural feature difference of low permeability reservoir is large, the thin larynx of pore is master, specific area is large, this strengthens the surface action on solid-liquid phase interface, micro-capillarity, electrochemical action, and present non-darcy flow feature, thereby exist, start producing pressure differential, cause immiscible drive-gas displacement initial stage of development easily to produce the phenomenon of " injection pressure is high; note does not enter ", the gas fingering phenomenon simultaneously producing due to oil gas viscosity differences or the microcrack of low-permeability oil deposit self non-homogeneity and existence easily cause " has channeling " phenomenon when carrying out immiscible drive-gas displacement.
It is a kind of method that has much the raising recovery ratio of potentiality that non-mixed phase air water is handed over note, for low-permeability oil deposit Efficient Development provides new way.Non-mixed phase air water hands over note owing to there is water slug, has reduced relative permeability and the mobility thereof of gas phase, has controlled gas fingering, to a certain extent the too early has channeling of mitigation of gases; Meanwhile, owing to there being gas slug, reduce water-oil mobility ratio, increased water drive swept volume coefficient.
But low-permeability oil deposit is carried out when non-mixed phase air water is handed over note also can being faced with following problem: the initial stage of production that low-permeability oil being ensconced on the one hand, gas injection pressure is high or water injection pressure is high; In exploitation, the later stage " has channeling " phenomenon may occur on the other hand, these problems make non-mixed phase air water alternately inject exploitation to be difficult to the development effectiveness that reaches desirable.
Utility model content
For the problems referred to above, the utility model proposes the non-mixed phase air water of a kind of low-permeability oil deposit and hand over note fluctuation step-down augmented injection device, this device can be realized under the condition of fixed tubular column, realizes the conversion that air water is handed over note, fluid injection fluctuation step-down augmented injection and non-mixed phase gas foam anti-channeling function.
The technical solution that the utility model adopts is:
The non-mixed phase air water of a kind of low-permeability oil deposit is handed over note fluctuation step-down augmented injection device, comprise the shaft bottom air water friendship note fluctuation step-down augmented injection device that is laid in gas injection, the liquid device on ground and is laid in shaft bottom, described gas injection, liquid device comprise Agitation Tank and the liquid storage tank of cryogenic high pressure, Agitation Tank is connected on the four-way of Injection Well well head by the first pipeline, on the first pipeline, be provided with the first plunger displacement pump, the liquid storage tank of cryogenic high pressure is connected in by the second pipeline on the four-way of Injection Well well head, is provided with the second plunger displacement pump and relief valve on the second pipeline, shaft bottom air water hands over note fluctuation step-down augmented injection device to be connected with the four-way of Injection Well well head by tubing string, described shaft bottom air water hands over note fluctuation step-down augmented injection device to comprise that fluid-mixing accelerates inducer, housing, collision body and fluid-mixing outlet section, the fluid inlet end that fluid-mixing accelerates inducer is connected with tubing string, fluid-mixing accelerates the fluid outlet of inducer and the fluid inlet end of housing is connected, the fluid passage internal diameter that fluid-mixing accelerates in inducer is dwindled to the port of export gradually by entrance point, the fluid outlet of housing is connected with the fluid inlet end of collision body, collision body is tapered, the tapering point of collision body is deep into enclosure interior, housing and fluid-mixing accelerate inducer, after collision body connects, its inner impulse hunting chamber that forms, the fluid outlet of collision body is connected with the fluid inlet end of fluid-mixing outlet section, fluid outlet at fluid-mixing outlet section is provided with fluid-mixing pressure release outlet section, the end port of described fluid-mixing pressure release outlet section is chamfering and arranges, on fluid-mixing outlet section, be provided with several fluid expulsion holes, the corresponding required gas injection of fluid-mixing outlet section, the target oil reservoir of de-plugging operation.
Preferably, described the second pipeline is withstand voltage acidproof pipeline, at the second pipeline, is coated with heating tape, and the operating pressure of the liquid storage tank of described cryogenic high pressure is 2.3MPa.
Preferably, described collision body and housing are bolted, and between collision body and housing, are provided with pad.
Preferably, between inner walls and collision body outer wall, be provided with sealing ring, the material that sealing ring adopts is high temperature resistant asbestos packing sheet, offers for placing the square groove of sealing ring on collision body outer wall.
Preferably, it is 5 °～8 ° that described fluid-mixing accelerates cone angle in inducer, and the conical surface angle of described collision body is 100 °～110 °.
Preferably, the diameter of the fluid outlet of described fluid-mixing acceleration inducer is greater than the diameter of the fluid-mixing entrance point of collision body.
Preferably, the diameter ratio of the diameter of described enclosure interior impulse hunting chamber and the fluid inlet end of collision body is 7～9, the length ratio of the impulse hunting chamber between the fluid outlet of the diameter of described enclosure interior impulse hunting chamber and the fluid inlet end of collision body and fluid-mixing acceleration inducer is 0.4～0.8, and described fluid-mixing accelerates the diameter of fluid outlet of inducer and the diameter ratio of the fluid-mixing entrance point of collision body is 1.5～2.5.
Preferably, the chamfer radius of described fluid-mixing pressure release outlet section end port is 5～10mm.
Preferably, described fluid expulsion hole is cylindrical hole, and cylindrical hole aperture is 5～8mm.
Useful technique effect of the present utility model is:
1, can under the condition of fixed tubular column, realize non-mixed phase air water and hand over note, fluid injection fluctuation step-down augmented injection and the transformation of energy of non-mixed phase gas foam anti-channeling merit, reduced the number of times of a lower tubular column, improved gas injection production efficiency, reduced gas injection development cost.
2, can be according to well intake pressure size, adjust in real time job step, by preparing the surfactant solution (as gas reverse wetting agent, surface-active oil displacement agent, blowing agent etc.) of difference in functionality as the working media of oil reservoir pulse ripple operation in Agitation Tank, thereby realize the difference in functionalitys such as gas wettability reversal, surfactant flooding and non-mixed phase gas foam anti-channeling of rock, the problem that is conducive to solve injection pressure height and " has channeling ", improves injection efficiency and oil recovery factor.
3, the difference in functionality surfactant solution of preparing in Agitation Tank is (as gas reverse wetting agent, surface-active oil displacement agent, blowing agent etc.) through tubing string, enter shaft bottom air water and hand over note fluctuation step-down augmented injection device, in this device, through fluid-mixing, accelerate after inducer accelerates, flow in impulse hunting chamber, in impulse hunting chamber, form vortex, and the pressure disturbance that further produces certain frequency, go round and begin again, and then at the impulse wave of the cylindrical hole ejection certain frequency of fluid-mixing outlet section, solution acts on target oil reservoir with the form of impulse wave, function by waterpower pulse wave action and institute's configuration surface activating agent reaches step-down, the effect of augmented injection and shutoff.
4, because vibration cavity is different to the requirement of working media wherein, when working media be take non-phase-mixing driving gas when main, cavity and impingement area can play further cavitation and homogeneous effect with gas to non-phase-mixing driving, thereby improve the uniformity of gas for device outlet non-phase-mixing driving.
5, the fluctuation fluid injection effect of fluid injection fluctuation step-down operation can effectively reduce the vapour lock effect causing after gas injection, thereby reduces gas injection pressure; The fluid injection frontal movement that simultaneously makes to fluctuate is more even, has improved injection fluid sweep efficiency; " has channeling " phenomenon for the gas injection later stage has good alleviation inhibitory action.
6, this apparatus structure is simple, and construction method is easy, and operating cost is low; Can adjust in real time operation technique according to injection pressure, effectively improve air-breathing (liquid) effect, significantly improve the production efficiency of low-permeability oil deposit immiscible drive-gas displacement.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram that the non-mixed phase air water of low-permeability oil deposit is handed over note fluctuation step-down augmented injection device;
Fig. 2 is the structural representation that shaft bottom air water is handed over note fluctuation step-down augmented injection device;
Fig. 3 is the process chart that the non-mixed phase air water of low-permeability oil deposit is handed over note fluctuation step-down augmented injection device implementation method.
In figure: 1. Agitation Tank, 2. the first pipeline, 3. the first plunger displacement pump, 4. Injection Well well head, 5. the second pipeline, 6. relief valve, 7. the second plunger displacement pump, 8. the liquid storage tank of cryogenic high pressure, 9. cement sheath, 10. surface pipe, 11. greasy filth sleeve pipes, 12. tubing strings, 13. preforation tunnels, 14. target oil reservoirs, 15. shaft bottom air waters are handed over note fluctuation step-down augmented injection device, 16. fluid-mixings accelerate inducer, 17. housings, 18. impulse hunting chambers, 19. collision bodies, 20. sealing rings, 21. pads, 22. standard bolts, 23. fluid-mixing outlet sections, 24. fluid-mixings accelerate the fluid inlet end of inducer, 25. fluid-mixings accelerate the fluid outlet of inducer, the fluid inlet end of 26. housings, the fluid inlet end of 27. collision bodies, 28. square grooves, the fluid outlet of 29. collision bodies, the fluid inlet end of 30. fluid-mixing outlet sections, 31. cylindrical holes, the fluid outlet of 32. fluid-mixing outlet sections, 33. fluid-mixing pressure release outlet sections.
The specific embodiment
Below in conjunction with drawings and Examples, the utility model is elaborated, but the utility model is not limited to following embodiment.
As shown in Figure 1, 2, the non-mixed phase air water of a kind of low-permeability oil deposit is handed over note fluctuation step-down augmented injection device, comprises the shaft bottom air water friendship note fluctuation step-down augmented injection device 15 that is laid in gas injection, the liquid device on ground and is laid in shaft bottom.Gas injection, liquid device comprise Agitation Tank 1 and the liquid storage tank 8 of cryogenic high pressure, and Agitation Tank 1 is connected on the four-way of Injection Well well head 4 by the first pipeline 2, is provided with the first plunger displacement pump 3 on the first pipeline 2.The liquid storage tank 8 of cryogenic high pressure is connected on the four-way of Injection Well well head 4 by the second pipeline 5, is provided with relief valve 6 and the second plunger displacement pump 7 on the second pipeline 5.Shaft bottom air water hands over note fluctuation step-down augmented injection device 15 to be connected with the four-way of Injection Well well head 4 by tubing string 12.Arranged outside at tubing string 12 has greasy filth sleeve pipe 11, in the arranged outside of greasy filth sleeve pipe 11, has surface pipe 10, in the upper outside of surface pipe 10, is provided with cement sheath 9.Described shaft bottom air water hands over note fluctuation step-down augmented injection device 15 to comprise that fluid-mixing for accelerating with fluid-mixing to operation accelerates inducer 16, housing 17, collision body 19 and for transmitting the fluid-mixing outlet section 23 of impulse hunting liquid or non-mixed phase gas.The fluid inlet end 24 that fluid-mixing accelerates inducer is connected by box cupling with the tail end of tubing string 12.Fluid-mixing accelerates the fluid outlet 25 of inducer and the fluid inlet end 26 of housing is connected, the fluid passage internal diameter that fluid-mixing accelerates in inducer is dwindled to the port of export gradually by entrance point, and the fluid outlet of housing is connected with the fluid inlet end 27 of collision body.Collision body 19 is tapered, and the tapering point of collision body is deep into housing 17 inside, and after housing 17 is connected with fluid-mixing acceleration inducer 16, collision body 19, its inside is formed for producing the impulse hunting chamber 18 of impulse hunting liquid.The fluid outlet 29 of collision body is connected with the fluid inlet end 30 of fluid-mixing outlet section, fluid outlet 32 at fluid-mixing outlet section is provided with fluid-mixing pressure release outlet section 33, the end port of described fluid-mixing pressure release outlet section 33 is chamfering and arranges, chamfer radius is 5～10mm, can realize the decompression function to residual fluid.On fluid-mixing outlet section 23, be provided with several fluid expulsion holes, described fluid expulsion hole is cylindrical hole 31, and the aperture of cylindrical hole 31 is 5～8mm, in order to transmit non-phase-mixing driving gas or waterpower pulse ripple.The target oil reservoir 14 of the corresponding required gas injection of fluid-mixing outlet section 23, de-plugging operation.
Above-mentioned Agitation Tank 1 as pulse ripple work operations medium, and pumps into Injection Well well head 4 through the first plunger displacement pump 3 for the surfactant solution of preparing difference in functionality.Above-mentioned the first pipeline 2 is generic connectivity pipeline, and the second pipeline 5 is withstand voltage acidproof pipeline, at the second pipeline, is coated with heating tape.The liquid storage tank 8 of above-mentioned cryogenic high pressure is for immiscible drive-gas displacement process, and operating pressure is 2.3MPa.What the second plunger displacement pump 7 that the liquid storage tank 8 of cryogenic high pressure connects was reciprocating piston pump is a kind of.Relief valve 6, the second plunger displacement pump 7, the liquid storage tank 8 of cryogenic high pressure and tubing string 12 all meet high pressure resistant, acidproof requirement.
Further, described collision body 19 is connected by standard bolt 22 with housing 17, between collision body 19 and housing 17, is provided with pad 21.Can be by add the size of the pad 21Lai regulating impulse oscillation chamber 18 of different-thickness between collision body 19 and housing 17.Sealing effectiveness for intensifier pulse oscillation chamber 18, between housing 17 inwalls and collision body 19 outer walls, be provided with sealing ring 20, the material that sealing ring 20 adopts is high temperature resistant asbestos packing sheet, offers for placing the square groove 28 of sealing ring 20 on collision body 19 outer walls.
Further, it is 5 °～8 ° that described fluid-mixing accelerates the interior cone angle of inducer 16, and the conical surface angle of described collision body 19 is 100 °～110 °; The diameter of the fluid outlet 25 of described fluid-mixing acceleration inducer is greater than the diameter of the fluid inlet end 27 of collision body; The diameter ratio of the diameter of described enclosure interior impulse hunting chamber and the fluid inlet end of collision body is 7～9, the length ratio of the impulse hunting chamber between the fluid outlet 24 of the diameter of described enclosure interior impulse hunting chamber 18 and the fluid inlet end 27 of collision body and fluid-mixing acceleration inducer is 0.4～0.8, and described fluid-mixing accelerates the diameter of fluid outlet 24 of inducer and the diameter ratio of the fluid inlet end 27 of collision body is 1.5～2.5.It is useful for gas wettability reversal, surfactant flooding and non-mixed phase gas foam anti-channeling that produced pulse frequency is more than set.
Further, above-mentioned fluid-mixing outlet section 23 can be arranged to different length specifications, specifically can hand over the thickness of the target oil reservoir 14 of note fluctuation step-down augmented injection operation to select according to required air water.Can select the fluid-mixing of the corresponding interface size to accelerate inducer 16 according to the tubing string 12 of different size mates.The metal material that said apparatus is used is 304 stainless steels.
The non-mixed phase air water of above-mentioned low-permeability oil deposit is handed over the implementation method of note fluctuation step-down augmented injection device, and its step comprises:
(1) shaft bottom air water is handed over note fluctuation step-down augmented injection device 15 be connected by taper pipe thread with tubing string 12, and G.I.H, to the top that needs operative goals oil reservoir 14;
(2) Agitation Tank 1 is connected with the first plunger displacement pump 3, the liquid storage tank 8 of cryogenic high pressure, the second plunger displacement pump 7 are connected with relief valve 6, be finally all connected on the four-way of Injection Well well head 4;
(3) in gas injection operation process, the liquid non-phase-mixing driving of cryogenic high pressure pumps into Injection Well well head 4 with gas through the second pipeline 5, the second plunger displacement pump 7, at this, transport in process, liquid non-phase-mixing driving uses gas along with the reduction of pressure and the rising of temperature, can gradate as gaseous state, gaseous state non-phase-mixing driving hands over note fluctuation step-down augmented injection device 15 to inject required operative goals oil reservoir 14 along tubing string 12 through the air water in shaft bottom with gas;
(4) when non-phase-mixing driving enters shaft bottom air water with gas, hand over after note fluctuation step-down augmented injection device 15, non-phase-mixing driving, enters in impulse hunting chamber 18 with gas after fluid-mixing acceleration inducer 16 accelerates;
(5) because non-phase-mixing driving uses the modulus of elasticity of gas much smaller than the modulus of elasticity of the aqueous solution, therefore in the interior generation that weakens impulse hunting of impulse hunting chamber 18, realize normal gas injection with gas and produce thereby can not produce pulse non-phase-mixing driving at the cylindrical hole 31 of fluid-mixing outlet section 23;
(6) in replacing fluid injection operation process, can be by preparing the solution of difference in functionality surfactant as the working media of pulse ripple operation in Agitation Tank 1; Liquid in Agitation Tank 1 pumps into Injection Well well head 4 by the first plunger displacement pump 3, and the tubing string 12 of flowing through is handed over and noted fluctuation step-down augmented injection device 15 to shaft bottom air water;
(7) when mixing material enters shaft bottom air water, hand over after note fluctuation step-down augmented injection device 15, liquid, after fluid-mixing accelerates inducer 16 acceleration, flows in impulse hunting chamber 18;
(8) in impulse hunting chamber 18, swiftly flowing liquid can drive its stationary fluid around, and momentum-exchange occurs simultaneously, produce certain thickness shear layer and form vortex, and vortex further forms the pressure disturbance of certain frequency in shear layer; Go round and begin again, at the cylindrical hole 31 of this device fluid-mixing outlet section 23, produce the impulse wave of certain frequencies and act on target oil reservoir 14.
To the non-mixed phase air water of above-mentioned low-permeability oil deposit, hand over the implementation method of note fluctuation step-down augmented injection device to carry out more specific detail below.
In low-permeability oil deposit being carried out to non-mixed phase air water alternately operating process, for Injection Well injection pressure, detect, and adjust in real time job step according to injection pressure situation.
One,, low-permeability oil deposit being carried out in air water alternately operating process, for the situation of Injection Well gas injection pressure high (14-15MPa), adopt following concrete implementation step:
(1) in gas injection operation process, when Injection Well well head gas injection pressure shows compared with up to 14-15MPa, now close the second plunger displacement pump 7, open relief valve 6; By preparation contains a certain amount of gas reverse wetting agent in Agitation Tank 1 solution as the working media of pulse ripple operation.
(2) the fluid injection operation that starts to hocket, the solution in Agitation Tank 1 pumps into Injection Well well head 4 by the first plunger displacement pump 3, and the tubing string 12 of flowing through is handed over note fluctuation step-down augmented injection device 15 to shaft bottom air water.
(3) when mixing material enters after the air water friendship note fluctuation step-down augmented injection device 15 in shaft bottom, liquid is after fluid-mixing accelerates inducer 16 acceleration, in inflow impulse hunting chamber 18.
(4) in oscillation chamber 18, swiftly flowing liquid can drive its stationary fluid around, and momentum-exchange occurs simultaneously, produces certain thickness shear layer and forms vortex, and vortex further produces the pressure disturbance of certain frequency in shear layer; Go round and begin again, the impulse wave that produces certain frequencies at the cylindrical hole 31 of this device fluid-mixing outlet section 23 acts on target oil reservoir 14.
(5) formed low frequency pulse wave is 7～9 at the diameter ratio of the diameter of enclosure interior impulse hunting chamber and the fluid inlet end of collision body, the length ratio that the fluid inlet end 27 of the diameter of impulse hunting chamber 18 and collision body and fluid-mixing accelerate the impulse hunting chamber between the fluid outlet 24 of inducer is 0.4～0.8, and it is that the pulse frequency that produces between 1.5～2.5 time is suitable for the fluid injection step-down augmented injection operation of fluctuating that fluid-mixing accelerates the diameter of fluid outlet 24 of inducer and the diameter ratio of the fluid inlet end 27 of collision body.
(6) when the mode of mixing material with impulse wave is injected into behind stratum, the waterpower pulse ripple wave action producing on the one hand contributes to make displacement in flooding frontal movement more even, improve injection fluid sweep efficiency, be conducive to remove Jamin effect simultaneously, thereby reduced injection pressure; The gas reverse wetting agent that injected on the other hand can make the wet or oily wet gas that is reversed to of rock surface water soak, thereby is conducive to improve gas drive displacement efficiency and gas injection effect.
(7) when well intake pressure drops to normal level, can carry out gas injection operation, now close the first plunger displacement pump 3, open the second plunger displacement pump 7 and start gas injection operation, the liquid CO of cryogenic high pressure
2through the second pipeline 5, the second plunger displacement pump 7, pump into Injection Well well head 4, at this, transport in process liquid CO
2along with the reduction of pressure and the rising of temperature, can gradate as gaseous state gaseous state CO
2along tubing string 12, through shaft bottom air water, hand over note fluctuation step-down augmented injection device 15 to inject required operative goals oil reservoir 14.
(8) as gaseous state CO
2the air water that enters shaft bottom is handed over after note fluctuation step-down augmented injection device 15, gaseous state CO
2after fluid-mixing accelerates inducer 16 acceleration, enter in impulse hunting chamber 18.
(9) due to gaseous state CO
2modulus of elasticity much smaller than the modulus of elasticity of the aqueous solution, therefore in the interior generation that weakens impulse hunting of impulse hunting chamber 18, can not produce pulse gaseous state CO at the cylindrical hole 31 of fluid-mixing outlet section 23
2and realize normal gas injection, produce.
Two, low-permeability oil deposit is being carried out in air water alternately operating process, Injection Well gas injection pressure shows lower (0-3MPa), and the situation of " has channeling " may occur along macropore gas, adopts following concrete implementation step:
(1) in gas injection operation process, when well head gas injection pressure shows the lower 0～3MPa that reaches, may there is along macropore " has channeling " in gas, now needs Injection Well to assess whether be applicable to injecting foam, or consider the shutoff to fluid-channeling channel.
(2) by preparation contains a certain amount of blowing agent in Agitation Tank 1 solution as the working media of pulse ripple operation, while handing over note fluctuation step-down augmented injection device 15 to inject operative goals oil reservoir through shaft bottom air water, can adopt foam to replace injection mode, consider to take the injection mode of solution-air-gas, at operative goals oil reservoir, produce foam, reach the object of non-mixed phase gas foam anti-channeling function.
(3) because inject a certain amount of gas to target oil reservoir, now temporary close the second plunger displacement pump 7 early stage; If there is no large fluid-channeling channel, the foaming agent solution of the gas first injecting layer fluid and follow-up injection isolator, reduces the impact of formation fluid on foam stabilization, due to the Jamin effect of gas, stratum is had to certain transfer drive effect simultaneously.
(4) the fluid injection operation that starts to hocket, the solution that contains blowing agent in Agitation Tank 1 pumps into Injection Well well head 4 by the first plunger displacement pump 3, and the tubing string 12 of flowing through is handed over note fluctuation step-down augmented injection device 15 to shaft bottom air water.
(5) when mixing material enters shaft bottom air water, hand over after note fluctuation step-down augmented injection device 15, liquid, after fluid-mixing accelerates inducer 16 acceleration, flows in impulse hunting chamber 18.
(6) in impulse hunting chamber 18, swiftly flowing liquid can drive its stationary fluid around, and momentum-exchange occurs simultaneously, produce certain thickness shear layer and form vortex, and vortex further forms the pressure disturbance of certain frequency in shear layer; Go round and begin again, the impulse wave that produces certain frequencies at the cylindrical hole 31 of this device fluid-mixing outlet section 23 acts on target oil reservoir 14.
(7) formed low frequency pulse wave is 7～9 at the diameter ratio of the diameter of enclosure interior impulse hunting chamber and the fluid inlet end of collision body, the length ratio that the fluid inlet end 27 of the diameter of impulse hunting chamber 18 and collision body and fluid-mixing accelerate the impulse hunting chamber between the fluid outlet 24 of inducer is 0.4～0.8, and it is that the pulse frequency that produces between 1.5～2.5 time is suitable for the fluid injection operation of fluctuating that fluid-mixing accelerates the diameter of fluid outlet 24 of inducer and the diameter ratio of the fluid inlet end 27 of collision body.
(8), when the mode of mixing material with impulse wave is injected into behind stratum, the foaming agent solution injecting and gas effect produce foam profile.
(9) the gas injection operation that again hockets, closes the first plunger displacement pump 3, opens the second plunger displacement pump 7 and carries out gas injection; The gas injecting can enter stratum from pit shaft by displacement foaming agent solution, produces foam above with the foaming agent solution injecting simultaneously, strengthens plugging effect.
Three, low-permeability oil deposit is being carried out in air water alternately operating process, for Injection Well water injection pressure, is showing the situation of higher (7-8MPa), adopting following concrete implementation step:
(1) in alternate water injection operation process, when well intake pressure shows up to 7-8MPa, can be by preparation contains a certain amount of surface-active oil displacement agent in Agitation Tank 1 solution the working media as pulse ripple operation.
(2) in fluid injection operation process, the solution in Agitation Tank 1 pumps into Injection Well well head 4 by plunger displacement pump 3, and the tubing string 12 of flowing through is handed over and noted fluctuation step-down augmented injection device 15 to shaft bottom air water.
(3) when mixing material enters shaft bottom air water, hand over after note fluctuation step-down augmented injection device 15, liquid, after fluid-mixing accelerates inducer 16 acceleration, flows in impulse hunting chamber 18.
(4) in impulse hunting chamber 18, swiftly flowing liquid can drive its stationary fluid around, and momentum-exchange occurs simultaneously, produce certain thickness shear layer and form vortex, and vortex further forms the pressure disturbance of certain frequency in shear layer; Go round and begin again, the impulse wave that produces certain frequencies at the cylindrical hole 31 of this device fluid-mixing outlet section 23 acts on target oil reservoir 14.
(5) formed low frequency pulse wave is 7～9 at the diameter ratio of the diameter of enclosure interior impulse hunting chamber and the fluid inlet end of collision body, the length ratio that the fluid inlet end 27 of the diameter of impulse hunting chamber 18 and collision body and fluid-mixing accelerate the impulse hunting chamber between the fluid outlet 24 of inducer is 0.4～0.8, and it is that the pulse frequency that produces between 1.5～2.5 time is suitable for the fluid injection step-down augmented injection operation of fluctuating that fluid-mixing accelerates the diameter of fluid outlet 24 of inducer and the diameter ratio of the fluid inlet end 27 of collision body.
(6) when the mode of mixing material with impulse wave is injected into behind stratum, the wave action of the waterpower pulse ripple producing on the one hand contributes to make displacement in flooding frontal movement more even, improve injection fluid sweep efficiency, and be conducive to remove Jamin effect, thereby reduced injection pressure; The surfactant flooding agent injected on the other hand can be carried out surfactant flooding, thereby is conducive to improve displacement efficiency and flood effectiveness.
(7) when well intake pressure drops to normal level, can carry out gas injection operation, now close the first plunger displacement pump 3, open the second plunger displacement pump 7 and start gas injection operation, the liquid CO of cryogenic high pressure
2through the second pipeline 5, the second plunger displacement pump 7, send into Injection Well well head 4, at this, transport in process liquid CO
2along with the reduction of pressure and the rising of temperature, can gradate as gaseous state CO
2, gaseous state CO
2along tubing string 12, through the air water in shaft bottom, hand over note fluctuation step-down augmented injection device to inject required operative goals oil reservoir 14.
(8) as gaseous state CO
2enter shaft bottom air water and hand over after note fluctuation step-down augmented injection device 15, gaseous state CO
2after fluid-mixing accelerates inducer 16 acceleration, enter in impulse hunting chamber 18.
(9) due to gaseous state CO
2modulus of elasticity much smaller than the modulus of elasticity of the aqueous solution, therefore in the interior generation that weakens impulse hunting of impulse hunting chamber 18, can not produce pulse gaseous state CO at the cylindrical hole 31 of fluid-mixing outlet section 23
2and realize normal gas injection, produce.
Claims (9)
1. the non-mixed phase air water of low-permeability oil deposit is handed over note fluctuation step-down augmented injection device, it is characterized in that: comprise the shaft bottom air water friendship note fluctuation step-down augmented injection device that is laid in gas injection, the liquid device on ground and is laid in shaft bottom, described gas injection, liquid device comprise Agitation Tank and the liquid storage tank of cryogenic high pressure, Agitation Tank is connected on the four-way of Injection Well well head by the first pipeline, on the first pipeline, be provided with the first plunger displacement pump, the liquid storage tank of cryogenic high pressure is connected in by the second pipeline on the four-way of Injection Well well head, is provided with the second plunger displacement pump and relief valve on the second pipeline, shaft bottom air water hands over note fluctuation step-down augmented injection device to be connected with the four-way of Injection Well well head by tubing string, described shaft bottom air water hands over note fluctuation step-down augmented injection device to comprise that fluid-mixing accelerates inducer, housing, collision body and fluid-mixing outlet section, the fluid inlet end that fluid-mixing accelerates inducer is connected with tubing string, fluid-mixing accelerates the fluid outlet of inducer and the fluid inlet end of housing is connected, the fluid passage internal diameter that fluid-mixing accelerates in inducer is dwindled to the port of export gradually by entrance point, the fluid outlet of housing is connected with the fluid inlet end of collision body, collision body is tapered, the tapering point of collision body is deep into enclosure interior, housing and fluid-mixing accelerate inducer, after collision body connects, its inner impulse hunting chamber that forms, the fluid outlet of collision body is connected with the fluid inlet end of fluid-mixing outlet section, fluid outlet at fluid-mixing outlet section is provided with fluid-mixing pressure release outlet section, the end port of described fluid-mixing pressure release outlet section is chamfering and arranges, on fluid-mixing outlet section, be provided with several fluid expulsion holes, the corresponding required gas injection of fluid-mixing outlet section, the target oil reservoir of de-plugging operation.
2. the non-mixed phase air water of a kind of low-permeability oil deposit according to claim 1 is handed over note fluctuation step-down augmented injection device, it is characterized in that: described the second pipeline is withstand voltage acidproof pipeline, at the second pipeline, be coated with heating tape, the operating pressure of the liquid storage tank of described cryogenic high pressure is 2.3MPa.
3. the non-mixed phase air water of a kind of low-permeability oil deposit according to claim 1 is handed over note fluctuation step-down augmented injection device, it is characterized in that: described collision body and housing are bolted, and between collision body and housing, is provided with pad.
4. the non-mixed phase air water of a kind of low-permeability oil deposit according to claim 1 is handed over note fluctuation step-down augmented injection device, it is characterized in that: between inner walls and collision body outer wall, be provided with sealing ring, the material that sealing ring adopts is high temperature resistant asbestos packing sheet, offers for placing the square groove of sealing ring on collision body outer wall.
5. the non-mixed phase air water of a kind of low-permeability oil deposit according to claim 1 is handed over note fluctuation step-down augmented injection device, it is characterized in that: it is 5 °～8 ° that described fluid-mixing accelerates cone angle in inducer, and the conical surface angle of described collision body is 100 °～110 °.
6. the non-mixed phase air water of a kind of low-permeability oil deposit according to claim 1 is handed over note fluctuation step-down augmented injection device, it is characterized in that: the diameter of the fluid outlet of described fluid-mixing acceleration inducer is greater than the diameter of the fluid-mixing entrance point of collision body.
7. the non-mixed phase air water of a kind of low-permeability oil deposit according to claim 1 is handed over note fluctuation step-down augmented injection device, it is characterized in that: the diameter ratio of the diameter of described enclosure interior impulse hunting chamber and the fluid inlet end of collision body is 7～9, the length ratio of the impulse hunting chamber between the fluid outlet of the diameter of described enclosure interior impulse hunting chamber and the fluid inlet end of collision body and fluid-mixing acceleration inducer is 0.4～0.8, described fluid-mixing accelerates the diameter of fluid outlet of inducer and the diameter ratio of the fluid-mixing entrance point of collision body is 1.5～2.5.
8. the non-mixed phase air water of a kind of low-permeability oil deposit according to claim 1 is handed over note fluctuation step-down augmented injection device, it is characterized in that: the chamfer radius of described fluid-mixing pressure release outlet section end port is 5～10mm.
9. the non-mixed phase air water of a kind of low-permeability oil deposit according to claim 1 is handed over note fluctuation step-down augmented injection device, it is characterized in that: described fluid expulsion hole is cylindrical hole, and cylindrical hole aperture is 5～8mm.
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| CN201420292215.0U CN203948078U (en) | 2014-06-04 | 2014-06-04 | The non-mixed phase air water of a kind of low-permeability oil deposit is handed over note fluctuation step-down augmented injection device |
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| CN201420292215.0U CN203948078U (en) | 2014-06-04 | 2014-06-04 | The non-mixed phase air water of a kind of low-permeability oil deposit is handed over note fluctuation step-down augmented injection device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103993863A (en) * | 2014-06-04 | 2014-08-20 | 中国石油大学(华东) | Low-permeability oil reservoir non-mixed-phase gas-water alternate injection and fluctuation depressurization augmented injection device and method |
| CN104912527A (en) * | 2015-06-02 | 2015-09-16 | 中国石油化工股份有限公司 | Construction process for gas producing system in oil well layer |
| US10053966B2 (en) | 2016-05-17 | 2018-08-21 | Nano Gas Technologies Inc. | Nanogas flooding of subterranean formations |
| CN108756840A (en) * | 2018-07-03 | 2018-11-06 | 武汉索克能源科技有限公司 | A kind of fluid pulse oil extraction system |
| US11193359B1 (en) | 2017-09-12 | 2021-12-07 | NanoGas Technologies Inc. | Treatment of subterranean formations |
| CN113833428A (en) * | 2020-06-23 | 2021-12-24 | 中国石油天然气股份有限公司 | Oscillation cavitation deblocking device with oil pipe pressure relief function and deblocking method |
| US11896938B2 (en) | 2021-10-13 | 2024-02-13 | Disruptive Oil And Gas Technologies Corp | Nanobubble dispersions generated in electrochemically activated solutions |
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- 2014-06-04 CN CN201420292215.0U patent/CN203948078U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103993863A (en) * | 2014-06-04 | 2014-08-20 | 中国石油大学(华东) | Low-permeability oil reservoir non-mixed-phase gas-water alternate injection and fluctuation depressurization augmented injection device and method |
| CN104912527A (en) * | 2015-06-02 | 2015-09-16 | 中国石油化工股份有限公司 | Construction process for gas producing system in oil well layer |
| US10053966B2 (en) | 2016-05-17 | 2018-08-21 | Nano Gas Technologies Inc. | Nanogas flooding of subterranean formations |
| US11193359B1 (en) | 2017-09-12 | 2021-12-07 | NanoGas Technologies Inc. | Treatment of subterranean formations |
| US11585195B2 (en) | 2017-09-12 | 2023-02-21 | Nano Gas Technologies Inc | Treatment of subterranean formations |
| CN108756840A (en) * | 2018-07-03 | 2018-11-06 | 武汉索克能源科技有限公司 | A kind of fluid pulse oil extraction system |
| CN113833428A (en) * | 2020-06-23 | 2021-12-24 | 中国石油天然气股份有限公司 | Oscillation cavitation deblocking device with oil pipe pressure relief function and deblocking method |
| US11896938B2 (en) | 2021-10-13 | 2024-02-13 | Disruptive Oil And Gas Technologies Corp | Nanobubble dispersions generated in electrochemically activated solutions |
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