CN103993863B - The non-mixed phase air water of low-permeability oil deposit is handed over note fluctuation step-down augmented injection device and method - Google Patents
The non-mixed phase air water of low-permeability oil deposit is handed over note fluctuation step-down augmented injection device and method Download PDFInfo
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- CN103993863B CN103993863B CN201410243523.9A CN201410243523A CN103993863B CN 103993863 B CN103993863 B CN 103993863B CN 201410243523 A CN201410243523 A CN 201410243523A CN 103993863 B CN103993863 B CN 103993863B
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Abstract
The present invention discloses the non-mixed phase air water of a kind of low-permeability oil deposit and hands over note fluctuation step-down augmented injection device and method, this device mainly comprises ground injecting gas, liquid device and shaft bottom air water friendship note fluctuation step-down augmented injection device, and described gas injection, liquid device mainly comprise the liquid storage tank of the cryogenic high pressure on ground, Agitation Tank and plunger displacement pump; Described air water hands over note fluctuation step-down augmented injection device to comprise that fluid-mixing accelerates inducer, collision body, housing and fluid-mixing outlet section; This device utilizes the effect of gas and hydroelasticity modulus difference and gravitational differentiation, realize the mutual conversion that in low-permeability oil deposit immiscible drive-gas displacement process, air water is handed over note, fluid injection fluctuation step-down augmented injection and non-mixed phase gas foam anti-channeling function, thereby raising injection efficiency, improves " has channeling " phenomenon. 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.
Description
Technical field
The present invention 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 fluctuationStep-down augmented injection process, is a kind of gas, the difference of liquid elasticity of fluid modulus and principle of gravitational differentiation utilized, and realizes low-permeability oilHide the device that in 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 changeAnd method.
Background technology
Immiscible drive-gas displacement is that one of low permeability oil field effectively improves recovery ratio and widely used development technique. But due to hyposmosisThe pore throat architectural feature difference of reservoir is large, the thin larynx of pore be main, specific area is large, this make surface action on solid-liquid phase interface,Micro-capillarity, electrochemical action strengthen, and present non-darcy flow feature, start producing pressure differential thereby exist, and cause immisciblePhase gas drive initial stage of development easily produces the phenomenon of " injection pressure is high, and note does not enter ", and the while is because oil gas viscosity differences producesThe microcrack of gas fingering phenomenon or low-permeability oil deposit self anisotropism and existence easily causes " has channeling " in the time carrying out immiscible drive-gas displacementPhenomenon.
It is a kind of method of the raising recovery ratio that has much potentiality that non-mixed phase air water is handed over note, for low-permeability oil deposit Efficient Development provides newApproach. 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 gasFingering, the to a certain extent too early has channeling of mitigation of gases; Meanwhile, owing to there being gas slug, reduce water-oil mobility ratio, increasedAdd water drive swept volume coefficient.
But when being carried out to non-mixed phase air water friendship note, low-permeability oil deposit also can be faced with following problem: low-permeability oil deposit on the one handInitial stage of production gas injection pressure high or water injection pressure is high; In the exploitation later stage, " has channeling " phenomenon may occur on the other hand, these are askedTopic makes non-mixed phase air water alternately inject exploitation to be difficult to the development effectiveness that reaches desirable.
Summary of the invention
For the problems referred to above, the present invention proposes the non-mixed phase air water of a kind of low-permeability oil deposit and hands over note fluctuation step-down augmented injection device and method, shouldDevice and method can be realized under the condition of fixed tubular column, realizes air water and hands over note, fluid injection fluctuation step-down augmented injection and non-mixed phase gasThe conversion of foam anti-channeling function.
The technology used in the present invention solution 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 be laid in ground gas injection, liquid device andThe shaft bottom air water that is laid in shaft bottom is handed over note fluctuation step-down augmented injection device, and described gas injection, liquid device comprise Agitation Tank and cryogenic high pressure liquidState storage tank, Agitation Tank is connected in by the first pipeline on the four-way of Injection Well well head, is provided with the first plunger displacement pump on the first pipeline,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 on the second pipelinePump and relief valve; 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 bottomAir 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, the fluid outlet of fluid-mixing acceleration inducer and housingFluid inlet end connects, and the fluid passage internal diameter that fluid-mixing accelerates in inducer is dwindled to the port of export gradually by entrance point, housingFluid outlet be connected with the fluid inlet end of collision body, collision body is tapered, the tapering point of collision body is deep into enclosure interior,After housing is connected with fluid-mixing acceleration inducer, collision body, its inner impulse hunting chamber, fluid issuing of collision body of formingEnd is connected with the fluid inlet end of fluid-mixing outlet section, is provided with fluid-mixing lets out at the fluid outlet of fluid-mixing outlet sectionPress outlet section, the end port of described fluid-mixing pressure release outlet section is chamfering to be arranged, is provided with some on fluid-mixing outlet sectionIndividual fluid expulsion hole, the target oil reservoir of the corresponding required gas injection of fluid-mixing outlet section, de-plugging operation.
Preferably, described the second pipeline is withstand voltage acidproof pipeline, is coated with heating tape at the second pipeline, described cryogenic high pressure liquidThe operating pressure of state storage tank 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 stoneCotton rubber slab offers the square groove for placing sealing ring on collision body outer wall.
Preferably, it is 5 °～8 ° that described fluid-mixing accelerates cone angle in inducer, the conical surface angle of described collision body be 100 °～110°。
Preferably, the diameter of the fluid outlet of described fluid-mixing acceleration inducer is greater than the fluid-mixing entrance point of collision bodyDiameter.
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 diameter of described enclosure interior impulse hunting chamber and the fluid inlet end of collision body and fluid-mixing accelerate the fluid issuing of inducerThe length ratio of the impulse hunting chamber between end is 0.4～0.8, and described fluid-mixing accelerates fluid outlet straight of inducerThe diameter ratio of the fluid-mixing entrance point of footpath and 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.
The non-mixed phase air water of low-permeability oil deposit is handed over an implementation method for note fluctuation step-down augmented injection device, comprises the following steps:
Being carried out, low-permeability oil deposit in non-mixed phase air water alternately operating process, monitors for Injection Well injection pressure, and rootAdjust in real time job step according to injection pressure situation;
If Injection Well gas injection pressure is high, adopt following concrete implementation step:
(101), in gas injection operation process, in the time that Injection Well well head gas injection pressure shows up to 14-15MPa, close the second postPlug pump, opens relief valve; And the solution that preparation contains gas reverse wetting agent in Agitation Tank is situated between as the work of pulse ripple operationMatter;
(102) the fluid injection operation that starts to hocket, the liquid in Agitation Tank pumps into Injection Well well head by the first plunger displacement pump, flows throughTubing string, hands over and notes fluctuation step-down augmented injection device to shaft bottom air water;
(103) liquid enters shaft bottom air water and hands over note fluctuation step-down augmented injection device, after fluid-mixing accelerates inducer acceleration, flows intoIn impulse hunting chamber, in impulse hunting chamber, swiftly flowing liquid drives its stationary fluid around, occurs moving simultaneouslyAmount exchange, produces certain thickness shear layer and forms vortex, and vortex further produces the pressure of certain frequency and disturbs in shear layerMoving, go round and begin again, hand over the cylindrical hole of note fluctuation step-down augmented injection device fluid-mixing outlet section to produce certain frequency at shaft bottom air waterImpulse wave acts on target oil reservoir, for fluid injection fluctuation step-down augmented injection operation;
(104) in the time that intake wellhead pressure drops to normal level, now close the first plunger displacement pump, open the second plunger displacement pump,Start gas injection operation, the liquid non-mixed phase gas of cryogenic high pressure pumps into Injection Well well head through the second pipeline and the second plunger displacement pump, in this fortuneSend in process, liquid non-mixed phase gas, along with the reduction of pressure and the rising of temperature, can gradate as gaseous state, the non-mixed phase of gaseous stateGas enters shaft bottom air water along tubing string and hands over note fluctuation step-down augmented injection device, after fluid-mixing accelerates inducer acceleration, enters pulseIn oscillation chamber, because the elastic modelling quantity of the non-mixed phase gas of gaseous state is much smaller than the elastic modelling quantity of solution, therefore in impulse hunting chamberWeaken the generation of impulse hunting, can not produce the immiscible phase gas of pulse gaseous state at the cylindrical hole of fluid-mixing outlet section, and realizeNormal gas injection is produced;
If Injection Well gas injection pressure is lower, adopt following concrete implementation step:
(201), in gas injection operation process, when Injection Well well head gas injection pressure shows the lower 0-3MPa that reaches, now judge gasMay there is along macropore " has channeling " in body; Temporary close the second plunger displacement pump is prepared foaming agent solution as impulse wave in Agitation TankThe working media of action industry, adopts foam to replace injection mode, and the foaming agent solution in Agitation Tank pumps into note by the first plunger displacement pumpEnter well well head, the tubing string of flowing through, hands over and notes fluctuation step-down augmented injection device to shaft bottom air water;
(202) foaming agent solution enters shaft bottom air water and hands over note fluctuation step-down augmented injection device, after fluid-mixing accelerates inducer acceleration,Flow in impulse hunting chamber, in impulse hunting chamber, swiftly flowing liquid drives its stationary fluid around, sends out simultaneouslyRaw momentum-exchange, produces certain thickness shear layer and forms vortex, and vortex further produces the pressure of certain frequency in shear layerForce-disturbance, goes round and begins again, and hands over the cylindrical hole of note fluctuation step-down augmented injection device fluid-mixing outlet section to produce frequently certain at shaft bottom air waterThe impulse wave of rate acts on target oil reservoir; When foaming agent solution is injected into behind stratum in the mode of impulse wave, the blowing agent injectingSolution and non-mixed phase gas produce foam in shaft bottom;
(203) the gas injection operation that again hockets, closes the first plunger displacement pump, opens the second plunger displacement pump and carries out gas injection, injectsThe foaming agent solution of gas in can driving device enters stratum, simultaneously and the foaming agent solution injecting above produce foam, to can" has channeling " passage that can form carries out shutoff;
If Injection Well water injection pressure is higher, adopt following concrete implementation step:
(301), in alternate water injection operation process, when Injection Well well intake pressure shows compared with up to 7-8MPa, can pass throughThe solution that preparation contains surface-active oil displacement agent in Agitation Tank is as the working media of pulse ripple operation; Solution in Agitation TankPump into Injection Well well head by the first plunger displacement pump, the tubing string of flowing through, hands over and notes fluctuation step-down augmented injection device to shaft bottom air water;
(302) liquid enters shaft bottom air water and hands over note fluctuation step-down augmented injection device, after fluid-mixing accelerates inducer acceleration, flows intoIn impulse hunting chamber; In impulse hunting chamber, swiftly flowing liquid can drive its stationary fluid around, sends out simultaneouslyRaw momentum-exchange, produces certain thickness shear layer and forms vortex, and vortex further forms certain frequency in shear layerPressure disturbance; Go round and begin again, hand over the cylindrical hole of note fluctuation step-down augmented injection device fluid-mixing outlet section to produce certain at shaft bottom air waterThe impulse wave of frequency acts on target oil reservoir, thereby reaches the effect of waterpower pulse fluctuation step-down and surfactant flooding;
(303) can carry out gas injection operation when well intake pressure drops to normal level, now close the first plunger displacement pump, openThe second plunger displacement pump, starts gas injection operation, and the liquid non-mixed phase gas of cryogenic high pressure is sent into Injection Well through the second pipeline, the second plunger displacement pumpWell head, transports in process at this, and liquid non-mixed phase gas, along with the reduction of pressure and the rising of temperature, can gradate as gaseous stateNon-mixed phase gas, the non-mixed phase gas of gaseous state enters shaft bottom air water along tubing string and hands over note fluctuation step-down augmented injection device, accelerates through fluid-mixingInducer enters in impulse hunting chamber after accelerating, because the elastic modelling quantity of the non-mixed phase gas of gaseous state is much smaller than the springform of solutionAmount, therefore weakened the generation of impulse hunting in impulse hunting chamber, can not produce pulse at the cylindrical hole of fluid-mixing outlet sectionThe non-mixed phase gas of gaseous state, produces and realize normal gas injection.
Useful technique effect of the present invention is:
1, can be 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 non-mixed phase gas foamThe transformation of energy of anti-channeling merit, has reduced the number of times of a lower tubular column, has improved gas injection production efficiency, has reduced gas injection development cost.
2, can, according to well intake pressure size, adjust in real time job step, by prepare the table of difference in functionality in Agitation TankSurface-active agent solution (as gas reverse wetting agent, surface-active oil displacement agent, blowing agent etc.) is as the work of oil reservoir pulse ripple operationMake medium, thereby realize the difference in functionalitys such as gas wettability reversal, surfactant flooding and the non-mixed phase gas foam anti-channeling of rock, haveBe beneficial to the problem that solves injection pressure height and " has channeling ", improve 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, foamingAgent etc.) enter shaft bottom air water friendship note fluctuation step-down augmented injection device through tubing string, in this device, accelerate inducer through fluid-mixing and accelerateAfter, flow in impulse hunting chamber, in impulse hunting chamber, form vortex, and further produce the pressure disturbance of certain frequency,Go round and begin again, and then spray the impulse wave of certain frequency at the cylindrical hole of fluid-mixing outlet section, solution is done with the form of impulse waveFor target oil reservoir, reach step-down, augmented injection and shutoff by the function of waterpower pulse wave action and institute's configuration surface activating agentEffect.
4, because vibration cavity is to the requirement difference of working media wherein, when working media taking non-phase-mixing driving gas when main, chamberBody and impingement area can play further cavitation and homogeneous effect with gas to non-phase-mixing driving, export non-mixed phase thereby improve deviceDrive the uniformity with gas.
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 injectionPressure; The fluid injection frontal movement that simultaneously makes to fluctuate is more even, has improved injection fluid sweep efficiency; For " the gas in gas injection later stageAlter " phenomenon 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.
Brief description of the drawings
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, the 8. liquid storage tank of cryogenic high pressure, 9. cement sheath, 10. surface pipe, 11. greasy filth sleeve pipes, 12. tubing strings, 13.Preforation tunnel, 14. target oil reservoirs, 15. shaft bottom air waters are handed over note fluctuation step-down augmented injection device, and 16. fluid-mixings accelerate inducer, 17.Housing, 18. impulse hunting chambers, 19. collision bodies, 20. sealing rings, 21. pads, 22. standard bolts, 23. fluid-mixings go outMouth section, 24. fluid-mixings accelerate the fluid inlet end of inducers, and 25. fluid-mixings accelerate the fluid outlet of inducers, 26.The fluid inlet end of housing, the fluid inlet end of 27. collision bodies, 28. square grooves, the fluid outlet of 29. collision bodies, 30.The fluid inlet end of fluid-mixing outlet section, 31. cylindrical holes, the fluid outlet of 32. fluid-mixing outlet sections, 33. fluid-mixingsPressure release outlet section.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is elaborated, but the invention is not restricted 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 and is laid in groundGas injection, liquid device and the shaft bottom air water that is laid in shaft bottom are handed over note fluctuation step-down augmented injection device 15. Gas injection, liquid device comprise Agitation Tank1 and the liquid storage tank 8 of cryogenic high pressure, Agitation Tank 1 is connected on the four-way of Injection Well well head 4 by the first pipeline 2, at the first pipeOn line 2, be provided with the first plunger displacement pump 3. The liquid storage tank 8 of cryogenic high pressure is connected in four of Injection Well well head 4 by the second pipeline 5Logical upper, on the second pipeline 5, be provided with relief valve 6 and the second plunger displacement pump 7. Shaft bottom air water is handed over note fluctuation step-down augmented injection device 15Be connected with the four-way of Injection Well well head 4 by tubing string 12. There is greasy filth sleeve pipe 11 in the arranged outside of tubing string 12, at greasy filth sleeve pipe11 arranged outside has surface pipe 10, is provided with cement sheath 9 in the upper outside of surface pipe 10. Described shaft bottom air water is handed overNote fluctuation step-down augmented injection device 15 comprise the fluid-mixing for accelerating to operation fluid-mixing accelerate 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. Fluid-mixing accelerate intoThe fluid inlet end 24 of mouth section is connected by box cupling with the tail end of tubing string 12. Fluid-mixing accelerates the fluid outlet of inducer25 are connected with the fluid inlet end 26 of housing, fluid-mixing accelerate fluid passage internal diameter in inducer by entrance point to the port of exportDwindle gradually, the fluid outlet of housing is connected with the fluid inlet end 27 of collision body. Collision body 19 is tapered, collision bodyTapering point is deep into housing 17 inside, after housing 17 is connected with fluid-mixing acceleration inducer 16, collision body 19, and its insideBe formed for producing the impulse hunting chamber 18 of impulse hunting liquid. Fluid outlet 29 and the fluid-mixing outlet section of collision bodyFluid inlet end 30 connect, be provided with fluid-mixing pressure release outlet section 33 at the fluid outlet 32 of fluid-mixing outlet section,The end port of described fluid-mixing pressure release outlet section 33 is chamfering to be arranged, chamfer radius is 5～10mm, can realize residual streamThe decompression function of body. On fluid-mixing outlet section 23, be provided with several fluid expulsion holes, described fluid expulsion hole is cylindrical hole31, the aperture of cylindrical hole 31 is 5～8mm, in order to transmit non-phase-mixing driving gas or waterpower pulse ripple. Fluid-mixing outlet section 23The target oil reservoir 14 of corresponding required gas injection, de-plugging operation.
Above-mentioned Agitation Tank 1 for the surfactant solution of preparing difference in functionality as pulse ripple work operations medium, and throughOne plunger displacement pump 3 pumps into Injection Well well head 4. Above-mentioned the first pipeline 2 is generic connectivity pipeline, and the second pipeline 5 is withstand voltage acid-proof pipeLine, is coated with heating tape at the second pipeline. The liquid storage tank 8 of above-mentioned cryogenic high pressure is for immiscible drive-gas displacement process, operating pressureFor 2.3MPa. The one that the second plunger displacement pump 7 that the liquid storage tank 8 of cryogenic high pressure connects is reciprocating piston pump. 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 17Be provided with pad 21. Can carry out regulating impulse vibration by add the pad 21 of different-thickness between collision body 19 and housing 17The size of chamber 18. For the sealing effectiveness of intensifier pulse oscillation chamber 18, housing 17 inwalls and collision body 19 outer walls itBetween be provided with sealing ring 20, the material that sealing ring 20 adopts is high temperature resistant asbestos packing sheet, on collision body 19 outer walls, offersBe useful on the square groove 28 of placing sealing ring 20.
Further, it is 5 °～8 ° that described fluid-mixing accelerates the interior cone angle of inducer 16, the conical surface of described collision body 19Angle is 100 °～110 °; The diameter of the fluid outlet 25 of described fluid-mixing acceleration inducer is greater than the fluid of collision bodyThe diameter of entrance point 27; The diameter ratio of the diameter of described enclosure interior impulse hunting chamber and the fluid inlet end of collision body is7～9, the diameter of described enclosure interior impulse hunting chamber 18 and the fluid inlet end of collision body 27 accelerate import with fluid-mixingThe length ratio of the impulse hunting chamber between the fluid outlet 24 of section is 0.4～0.8, and described fluid-mixing accelerates inducerThe diameter of fluid outlet 24 and the diameter ratio of the fluid inlet end 27 of collision body be 1.5～2.5. More than arrange producePulse frequency be useful for gas wettability reversal, surfactant flooding and non-mixed phase gas foam anti-channeling.
Further, above-mentioned fluid-mixing outlet section 23 can be arranged to different length specifications, specifically can hand over note according to required air waterThe thickness of the target oil reservoir 14 of fluctuation step-down augmented injection operation is selected. Can select the corresponding interface according to the tubing string of different size 12The fluid-mixing of size accelerates inducer 16 and mates. The metal material that said apparatus uses 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, by liquid cryogenic high pressure storage tank 8, the second plunger displacement pump 7 and pressure releaseValve 6 is connected, and is 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 uses gas through the second pipeline 5, the second plunger displacement pump 7 pumpsEnter Injection Well well head 4, transport in process at this, liquid non-phase-mixing driving uses gas along with the reduction of pressure and the rising of temperature, meetingGradate as gaseous state, gaseous state non-phase-mixing driving is handed over note fluctuation step-down augmented injection device 15 notes along tubing string 12 through the air water in shaft bottom with gasEnter required operative goals oil reservoir 14;
(4) hand over after note fluctuation step-down augmented injection device 15 when non-phase-mixing driving enters shaft bottom air water with gas, non-phase-mixing driving is mixed with gas warpInterflow body accelerates, after inducer 16 acceleration, to enter in impulse hunting chamber 18;
(5) because non-phase-mixing driving uses the elastic modelling quantity of gas much smaller than the elastic modelling quantity of the aqueous solution, therefore in impulse hunting chamber 18Weakened the generation of impulse hunting, the cylindrical hole 31 of fluid-mixing outlet section 23 can not produce pulse non-phase-mixing driving with gas fromProduce and realize normal gas injection;
(6) replacing in fluid injection operation process, can do by the solution of preparing difference in functionality surfactant in Agitation Tank 1For the working media of pulse ripple operation; Liquid in Agitation Tank 1 pumps into Injection Well well head 4 by the first plunger displacement pump 3, flows throughTubing string 12, hands over and notes fluctuation step-down augmented injection device 15 to shaft bottom air water;
(7) hand over after note fluctuation step-down augmented injection device 15 when mixing material enters shaft bottom air water, liquid accelerates inducer through fluid-mixingAfter 16 acceleration, flow in impulse hunting chamber 18;
(8) in impulse hunting chamber 18, swiftly flowing liquid can drive its stationary fluid around, occurs moving simultaneouslyAmount exchange, produces certain thickness shear layer and forms vortex, and vortex further forms the pressure of certain frequency in shear layerDisturbance; Go round and begin again, produce the impulse wave of certain frequency and act at the cylindrical hole 31 of this device fluid-mixing outlet section 23Target oil reservoir 14.
Hand over the implementation method of note fluctuation step-down augmented injection device to carry out more specifically to the non-mixed phase air water of above-mentioned low-permeability oil deposit belowBright.
Being carried out, low-permeability oil deposit in non-mixed phase air water alternately operating process, detects for Injection Well injection pressure, and rootAdjust 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 Injection Well gas injection pressure high (14-15MPa)Situation, adopts 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 secondPlunger displacement pump 7, opens relief valve 6; By preparing the solution that contains a certain amount of gas reverse wetting agent as pulse in Agitation Tank 1The working media of fluctuation 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,The tubing string 12 of flowing through, hands over note fluctuation step-down augmented injection device 15 to shaft bottom air water.
(3) air water that enters shaft bottom when mixing material is handed over after note fluctuation step-down augmented injection device 15, liquid through fluid-mixing accelerate intoMouth section 16 flows in impulse hunting chamber 18 after accelerating.
(4) in oscillation chamber 18, swiftly flowing liquid can drive its stationary fluid around, momentum occurs simultaneously and hand overChange, produce certain thickness shear layer and form vortex, vortex further produces the pressure disturbance of certain frequency in shear layer;Go round and begin again, the impulse wave that produces certain frequency at the cylindrical hole 31 of this device fluid-mixing outlet section 23 acts on target oil reservoir14。
(5) low frequency pulse wave forming is at the diameter of the diameter of enclosure interior impulse hunting chamber and the fluid inlet end of collision bodyRatio be 7～9, the fluid inlet end of the diameter of impulse hunting chamber 18 and collision body 27 and fluid-mixing accelerate the stream of inducerThe length ratio of the impulse hunting chamber between the body port of export 24 is 0.4～0.8, and fluid-mixing accelerates the fluid issuing of inducerThe pulse frequency that the diameter ratio of the fluid inlet end 27 of end 24 diameter and collision body produced for time between 1.5～2.5 is suitable forFluid injection fluctuation step-down augmented injection operation.
(6), when mixing material is injected into behind stratum in the mode of impulse wave, the waterpower pulse ripple wave action producing on the one hand helpsIn making, displacement in flooding frontal movement is more even, improved injection fluid sweep efficiency, is conducive to remove Jamin effect simultaneously, fromAnd reduction 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 be conducive to improve gas drive displacement efficiency and gas injection effect.
(7) can carry out gas injection operation when well intake pressure drops to normal level, now close the first plunger displacement pump 3, openThe second plunger displacement pump 7 starts gas injection operation, the liquid CO of cryogenic high pressure2Pump into Injection Well well head through the second pipeline 5, the second plunger displacement pump 74, transport in process liquid CO at this2Along with the reduction of pressure and the rising of temperature, can gradate as gaseous state gaseous state CO2Hand over note fluctuation step-down augmented injection device 15 to inject required operative goals oil reservoir 14 along tubing string 12 through shaft bottom air water.
(8) as gaseous state CO2The air water that enters shaft bottom is handed over after note fluctuation step-down augmented injection device 15, gaseous state CO2Accelerate through fluid-mixingAfter inducer 16 accelerates, enter in impulse hunting chamber 18.
(9) due to gaseous state CO2Elastic modelling quantity much smaller than the elastic modelling quantity of the aqueous solution, therefore weakened impulse hunting chamber 18 is interiorThe generation of impulse hunting, can not produce pulse gaseous state CO at the cylindrical hole 31 of fluid-mixing outlet section 232And it is raw to realize normal gas injectionProduce.
Two,, low-permeability oil deposit being carried out in air water alternately operating process, Injection Well gas injection pressure shows lower (0-3MPa), gasMay there is along macropore the situation of " has channeling " in body, adopt following concrete implementation step:
(1), in gas injection operation process, when well head gas injection pressure shows the lower 0～3MPa that reaches, gas may be sent out along macroporeRaw " has channeling ", now needs Injection Well to assess whether be applicable to injecting foam, or considers 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, produce foam at operative goals oil reservoir, reach the order 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 noLarge fluid-channeling channel, the foaming agent solution of the gas first injecting layer fluid and follow-up injection isolator, reduces formation fluid pairThe impact of foam stabilization due to the Jamin effect of gas, has certain transfer drive effect to stratum simultaneously.
(4) the fluid injection operation that starts to hocket, the solution that contains blowing agent in Agitation Tank 1 pumps into injection by the first plunger displacement pump 3Well well head 4, the tubing string 12 of flowing through, hands over and notes fluctuation step-down augmented injection device 15 to shaft bottom air water.
(5) hand over after note fluctuation step-down augmented injection device 15 when mixing material enters shaft bottom air water, liquid accelerates import through fluid-mixingSection 16 flows in impulse hunting chamber 18 after accelerating.
(6) in impulse hunting chamber 18, swiftly flowing liquid can drive its stationary fluid around, occurs moving simultaneouslyAmount exchange, produces certain thickness shear layer and forms vortex, and vortex further forms the pressure of certain frequency in shear layerDisturbance; Go round and begin again, the impulse wave that produces certain frequency at the cylindrical hole 31 of this device fluid-mixing outlet section 23 acts on orderMark oil reservoir 14.
(7) low frequency pulse wave forming is at the diameter of the diameter of enclosure interior impulse hunting chamber and the fluid inlet end of collision bodyRatio be 7～9, the fluid inlet end of the diameter of impulse hunting chamber 18 and collision body 27 and fluid-mixing accelerate the stream of inducerThe length ratio of the impulse hunting chamber between the body port of export 24 is 0.4～0.8, and fluid-mixing accelerates the fluid issuing of inducerThe pulse frequency that the diameter ratio of the fluid inlet end 27 of end 24 diameter and collision body produced for time between 1.5～2.5 is suitable forFluid injection fluctuation operation.
(8), when mixing material is injected into behind stratum in the mode of impulse wave, the foaming agent solution injecting and gas effect produce bubbleFoam transfer drive.
(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; Institute injectsGas can enter stratum from pit shaft by displacement foaming agent solution, simultaneously and the foaming agent solution injecting above produce foam, strengthenPlugging effect.
Three, low-permeability oil deposit being carried out in air water alternately operating process, show higher (7-8MPa) for Injection Well water injection pressureSituation, adopt following concrete implementation step:
(1), in alternate water injection operation process, when well intake pressure shows compared with up to 7-8MPa, can pass through at Agitation Tank 1The solution that middle preparation contains a certain amount of surface-active oil displacement agent is as the working media of 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, the tubing string of flowing through12, hand over and note fluctuation step-down augmented injection device 15 to shaft bottom air water.
(3) hand over after note fluctuation step-down augmented injection device 15 when mixing material enters shaft bottom air water, liquid accelerates import through fluid-mixingSection 16 flows in impulse hunting chamber 18 after accelerating.
(4) in impulse hunting chamber 18, swiftly flowing liquid can drive its stationary fluid around, occurs moving simultaneouslyAmount exchange, produces certain thickness shear layer and forms vortex, and vortex further forms the pressure of certain frequency in shear layerDisturbance; Go round and begin again, the impulse wave that produces certain frequency at the cylindrical hole 31 of this device fluid-mixing outlet section 23 acts on orderMark oil reservoir 14.
(5) low frequency pulse wave forming is at the diameter of the diameter of enclosure interior impulse hunting chamber and the fluid inlet end of collision bodyRatio be 7～9, the fluid inlet end of the diameter of impulse hunting chamber 18 and collision body 27 and fluid-mixing accelerate the stream of inducerThe length ratio of the impulse hunting chamber between the body port of export 24 is 0.4～0.8, and fluid-mixing accelerates the fluid issuing of inducerThe pulse frequency that the diameter ratio of the fluid inlet end 27 of end 24 diameter and collision body produced for time between 1.5～2.5 is suitable forFluid injection fluctuation step-down augmented injection operation.
(6), when mixing material is injected into behind stratum in the mode of impulse wave, the wave action of the waterpower pulse ripple producing on the one hand hasHelp make displacement in flooding frontal movement more even, improved injection fluid sweep efficiency, and be conducive to remove Jamin effect, fromAnd reduction injection pressure; The surfactant flooding agent injected on the other hand can be carried out surfactant flooding, thereby favourableIn improving displacement efficiency and flood effectiveness.
(7) can carry out gas injection operation when well intake pressure drops to normal level, now close the first plunger displacement pump 3, openThe second plunger displacement pump 7 starts gas injection operation, the liquid CO of cryogenic high pressure2Send into Injection Well well head through the second pipeline 5, the second plunger displacement pump 74, transport in process liquid CO at this2Along with the reduction of pressure and the rising of temperature, can gradate as gaseous state CO2, gaseous stateCO2Hand over note fluctuation step-down augmented injection device to inject required operative goals oil reservoir 14 along tubing string 12 through the air water in shaft bottom.
(8) as gaseous state CO2Enter shaft bottom air water and hand over after note fluctuation step-down augmented injection device 15, gaseous state CO2Through fluid-mixing accelerate intoMouth section 16 enters in impulse hunting chamber 18 after accelerating.
(9) due to gaseous state CO2Elastic modelling quantity much smaller than the elastic modelling quantity of the aqueous solution, therefore weakened impulse hunting chamber 18 is interiorThe generation of impulse hunting, can not produce pulse gaseous state CO at the cylindrical hole 31 of fluid-mixing outlet section 232And it is raw to realize normal gas injectionProduce.
Claims (8)
1. the non-mixed phase air water of low-permeability oil deposit is handed over a note fluctuation step-down augmented injection device, it is characterized in that: comprise and be laid in groundGas injection, liquid device and the shaft bottom air water that is laid in shaft bottom are handed over note fluctuation step-down augmented injection device, and described gas injection, liquid device comprise dosingThe liquid storage tank of tank and cryogenic high pressure, Agitation Tank is connected in by the first pipeline on the four-way of Injection Well well head, on the first pipeline, establishesBe equipped 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, at the second pipelineOn be provided with the second plunger displacement pump and relief valve; Shaft bottom air water hands over note fluctuation step-down augmented injection device by four of tubing string and Injection Well well headLead to and connect; Described shaft bottom air water hand over note fluctuation step-down augmented injection device comprise fluid-mixing accelerate inducer, housing, collision body andFluid-mixing outlet section, the fluid inlet end that fluid-mixing accelerates inducer is connected with tubing string, and fluid-mixing accelerates the stream of inducerThe body port of export is connected with the fluid inlet end of housing, fluid-mixing accelerate fluid passage internal diameter in inducer by entrance point to exportingEnd dwindles gradually, and the fluid outlet of housing is connected with the fluid inlet end of collision body, and collision body is tapered, the taper of collision bodyEnd is deep into enclosure interior, after housing is connected with fluid-mixing acceleration inducer, collision body, and 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, at the fluid outlet of fluid-mixing outlet sectionBe provided with fluid-mixing pressure release outlet section, the end port of described fluid-mixing pressure release outlet section is chamfering to be arranged, goes out at fluid-mixingIn mouth section, be provided with several fluid expulsion holes, the target oil reservoir of the corresponding required gas injection of fluid-mixing outlet section, de-plugging operation; InstituteStating the second pipeline is withstand voltage acidproof pipeline, is coated with heating tape at the second pipeline, and the work of the liquid storage tank of described cryogenic high pressure is pressedPower is 2.3MPa; Described collision body and housing are bolted, and between collision body and housing, are provided with pad.
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, and its feature existsIn: 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,On collision body outer wall, offer the square groove for placing sealing ring.
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, and its feature existsIn: 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 °.
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, and its feature existsIn: 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.
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, and its feature existsIn: the diameter ratio of the diameter of described enclosure interior impulse hunting chamber and the fluid inlet end of collision body is 7～9, described housingBetween the fluid outlet of the fluid inlet end of the diameter of internal pulses oscillation chamber and collision body and fluid-mixing acceleration inducerThe length ratio of impulse hunting chamber is 0.4～0.8, and described fluid-mixing accelerates diameter and the collision of the fluid outlet of inducerThe diameter ratio of the fluid-mixing entrance point of body is 1.5～2.5.
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, and its feature existsIn: the chamfer radius of described fluid-mixing pressure release outlet section end port is 5～10mm.
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, and its feature existsIn: described fluid expulsion hole is cylindrical hole, and cylindrical hole aperture is 5～8mm.
8. the non-mixed phase air water of low-permeability oil deposit is handed over an implementation method for note fluctuation step-down augmented injection device, adopts as claim 1The non-mixed phase air water of low-permeability oil deposit of stating is handed over note fluctuation step-down augmented injection device, it is characterized in that comprising the following steps:
Being carried out, low-permeability oil deposit in non-mixed phase air water alternately operating process, monitors for Injection Well injection pressure, and rootAdjust in real time job step according to injection pressure situation;
If Injection Well gas injection pressure is high, adopt following concrete implementation step:
(101), in gas injection operation process, in the time that Injection Well well head gas injection pressure shows up to 14-15MPa, close the second postPlug pump, opens relief valve; And the solution that preparation contains gas reverse wetting agent in Agitation Tank is situated between as the work of pulse ripple operationMatter;
(102) the fluid injection operation that starts to hocket, the liquid in Agitation Tank pumps into Injection Well well head by the first plunger displacement pump, flows throughTubing string, hands over and notes fluctuation step-down augmented injection device to shaft bottom air water;
(103) liquid enters shaft bottom air water and hands over note fluctuation step-down augmented injection device, after fluid-mixing accelerates inducer acceleration, flows intoIn impulse hunting chamber, in impulse hunting chamber, swiftly flowing liquid drives its stationary fluid around, occurs moving simultaneouslyAmount exchange, produces certain thickness shear layer and forms vortex, and vortex further produces the pressure of certain frequency and disturbs in shear layerMoving, go round and begin again, hand over the cylindrical hole of note fluctuation step-down augmented injection device fluid-mixing outlet section to produce certain frequency at shaft bottom air waterImpulse wave acts on target oil reservoir, for fluid injection fluctuation step-down augmented injection operation;
(104) in the time that intake wellhead pressure drops to normal level, now close the first plunger displacement pump, open the second plunger displacement pump,Start gas injection operation, the liquid non-mixed phase gas of cryogenic high pressure pumps into Injection Well well head through the second pipeline and the second plunger displacement pump, in this fortuneSend in process, liquid non-mixed phase gas, along with the reduction of pressure and the rising of temperature, can gradate as gaseous state, the non-mixed phase of gaseous stateGas enters shaft bottom air water along tubing string and hands over note fluctuation step-down augmented injection device, after fluid-mixing accelerates inducer acceleration, enters pulseIn oscillation chamber, because the elastic modelling quantity of the non-mixed phase gas of gaseous state is much smaller than the elastic modelling quantity of solution, therefore in impulse hunting chamberWeaken the generation of impulse hunting, can not produce the immiscible phase gas of pulse gaseous state at the cylindrical hole of fluid-mixing outlet section, and realizeNormal gas injection is produced;
If Injection Well gas injection pressure is lower, adopt following concrete implementation step:
(201), in gas injection operation process, when Injection Well well head gas injection pressure shows the lower 0-3MPa that reaches, now judge gasMay there is along macropore " has channeling " in body; Temporary close the second plunger displacement pump is prepared foaming agent solution as impulse wave in Agitation TankThe working media of action industry, adopts foam to replace injection mode, and the foaming agent solution in Agitation Tank pumps into note by the first plunger displacement pumpEnter well well head, the tubing string of flowing through, hands over and notes fluctuation step-down augmented injection device to shaft bottom air water;
(202) foaming agent solution enters shaft bottom air water and hands over note fluctuation step-down augmented injection device, after fluid-mixing accelerates inducer acceleration,Flow in impulse hunting chamber, in impulse hunting chamber, swiftly flowing liquid drives its stationary fluid around, sends out simultaneouslyRaw momentum-exchange, produces certain thickness shear layer and forms vortex, and vortex further produces the pressure of certain frequency in shear layerForce-disturbance, goes round and begins again, and hands over the cylindrical hole of note fluctuation step-down augmented injection device fluid-mixing outlet section to produce frequently certain at shaft bottom air waterThe impulse wave of rate acts on target oil reservoir; When foaming agent solution is injected into behind stratum in the mode of impulse wave, the blowing agent injectingSolution and non-mixed phase gas produce foam in shaft bottom;
(203) the gas injection operation that again hockets, closes the first plunger displacement pump, opens the second plunger displacement pump and carries out gas injection, injectsThe foaming agent solution of gas in can driving device enters stratum, simultaneously and the foaming agent solution injecting above produce foam, to can" has channeling " passage that can form carries out shutoff;
If Injection Well water injection pressure is higher, adopt following concrete implementation step:
(301), in alternate water injection operation process, when Injection Well well intake pressure shows compared with up to 7-8MPa, can pass throughThe solution that preparation contains surface-active oil displacement agent in Agitation Tank is as the working media of pulse ripple operation; Solution in Agitation TankPump into Injection Well well head by the first plunger displacement pump, the tubing string of flowing through, hands over and notes fluctuation step-down augmented injection device to shaft bottom air water;
(302) liquid enters shaft bottom air water and hands over note fluctuation step-down augmented injection device, after fluid-mixing accelerates inducer acceleration, flows intoIn impulse hunting chamber; In impulse hunting chamber, swiftly flowing liquid can drive its stationary fluid around, sends out simultaneouslyRaw momentum-exchange, produces certain thickness shear layer and forms vortex, and vortex further forms certain frequency in shear layerPressure disturbance; Go round and begin again, hand over the cylindrical hole of note fluctuation step-down augmented injection device fluid-mixing outlet section to produce certain at shaft bottom air waterThe impulse wave of frequency acts on target oil reservoir, thereby reaches the effect of waterpower pulse fluctuation step-down and surfactant flooding;
(303) can carry out gas injection operation when well intake pressure drops to normal level, now close the first plunger displacement pump, openThe second plunger displacement pump, starts gas injection operation, and the liquid non-mixed phase gas of cryogenic high pressure is sent into Injection Well through the second pipeline, the second plunger displacement pumpWell head, transports in process at this, and liquid non-mixed phase gas, along with the reduction of pressure and the rising of temperature, can gradate as gaseous stateNon-mixed phase gas, the non-mixed phase gas of gaseous state enters shaft bottom air water along tubing string and hands over note fluctuation step-down augmented injection device, accelerates through fluid-mixingInducer enters in impulse hunting chamber after accelerating, because the elastic modelling quantity of the non-mixed phase gas of gaseous state is much smaller than the springform of solutionAmount, therefore weakened the generation of impulse hunting in impulse hunting chamber, can not produce pulse at the cylindrical hole of fluid-mixing outlet sectionThe non-mixed phase gas of gaseous state, produces and realize normal gas injection.
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| 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 |
| CN110029972B (en) * | 2019-04-15 | 2023-08-08 | 西安长庆科技工程有限责任公司 | Foam-assisted oxygen reduction air driving injection allocation valve group and process method |
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| CN113982573B (en) * | 2021-11-22 | 2023-07-07 | 中国石油大学(北京) | Method and processor for inhibiting displacement front fingering |
| CN114412415B (en) * | 2022-04-01 | 2022-06-10 | 海泰能源科技(天津)有限公司 | Self-excitation resonance wax-proof and scale-proof device and method |
| CN115199243B (en) * | 2022-06-09 | 2023-09-22 | 中国石油大学(华东) | Water-gas alternate gas injection device for dense oil reservoir exploitation |
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| RU2078200C1 (en) * | 1994-03-04 | 1997-04-27 | Валерий Петрович Дыбленко | Method for development of oil formation |
| CN201218066Y (en) * | 2008-03-31 | 2009-04-08 | 中国石油天然气集团公司 | Down-hole decompression tool |
| CN202250005U (en) * | 2011-08-19 | 2012-05-30 | 中国石油天然气股份有限公司 | Depressurization and injection-increasing device for water injection well |
| CN202690024U (en) * | 2012-07-07 | 2013-01-23 | 刘防修 | Forced hydraulic impact pulsing injector |
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