CN102031955B - Ultrasonic-assisted reservoir stratum chemical blockage removal experimental facility and experimental method - Google Patents
Ultrasonic-assisted reservoir stratum chemical blockage removal experimental facility and experimental method Download PDFInfo
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- CN102031955B CN102031955B CN 201010295887 CN201010295887A CN102031955B CN 102031955 B CN102031955 B CN 102031955B CN 201010295887 CN201010295887 CN 201010295887 CN 201010295887 A CN201010295887 A CN 201010295887A CN 102031955 B CN102031955 B CN 102031955B
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Abstract
The invention discloses an ultrasonic-assisted reservoir stratum chemical blockage removal experimental facility and an experimental method. The experimental facility comprises a rock core clamp holder, a ring compression feed device, an ultrasonic energy converter, an ultrasonic generator, a chemical reagent storage tank connected with a liquid inlet of the rock core clamp holder by a conveying pipeline, a water storage tank, an oil storage tank and a liquid container connected with a liquid outlet of the rock core clamp holder. The experimental method comprises the following steps of: 1, pretreating a tested rock core; 2, testing the initial permeability of the rock core through water drive; 3, polluting the rock core; 4, testing the permeability of the polluted rock core through the water drive; 5, performing an ultrasonic-assisted chemical reagent blockage removal experiment; 6, testing the permeability of the rock core subjected to the blockage removal through the water drive; 7, performing the ultrasonic-assisted chemical blockage removal experiment under the condition of ultrasonic oscillation with different frequencies and amplitudes; and 8, processing data. The ultrasonic-assisted reservoir stratum chemical blockage removal experimental facility has reasonable design, complete functions and high using effect, is easy and convenient to arrange and operate, and can realize the pulse fluctuation of the chemical blockage removal under the action of the ultrasonic oscillation.
Description
Technical field
The invention belongs to the indoor chemical plugging removal simulated experiment technical field of recovering the oil, especially relate to a kind of ultrasonic-assisted reservoir stratum chemical blockage removal experimental facility and experimental technique.
Background technology
Owing to needing to use a large amount of chemical agents in the oilfield exploitation, thereby so that the stratum generation is stopped up contaminated, and nowadays the contaminated situation in stratum is to deep layer, remote development, therefore be badly in need of a kind of effective chemical plugging removal method and solve existing formation blockage pollution problem in the oilfield exploitation, meanwhile, corresponding chemical plugging removal experimental facilities and experimental technique also seem and become more and more important.But, the plugging removal effect of conventional acidifying and chemical plugging removal means is all relatively poor at present, its action time is short and to enter the distance on stratum little, can not effectively solve the de-plugging problem that formation blockage is polluted, thereby existing acidifying and chemical plugging removal means can not satisfy on-the-spot actual demand.
The ultrasonic wave oil recovery technique is a kind of of Physical oil recovery technique, and as far back as the 1950's, the U.S. and the former Soviet Union have just begun the research of this technology, and are applied in the real work.To 20 century 70s, along with technology of acoustic wave develop rapidly and to the further understanding of Ultrasonic characteristics, so that the intensified by ultrasonic wave oil recovery technique is subject to paying attention to more and more widely in oil extraction operation.Early 1990s take the former Soviet Union, the U.S. as the country of representative carries out large-area applying especially, can make well oil output improve 40%～60%, and oil recovery factor improves more than 10%, and the ultrasonic wave oil recovery is implemented as power and can reaches more than 80%.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned deficiency of the prior art, provide a kind of simple in structure, install and lay convenient, reliable working performance and simulate effect is good, the de-plugging ability is strong ultrasonic-assisted reservoir stratum chemical blockage removal experimental facility.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of ultrasonic-assisted reservoir stratum chemical blockage removal experimental facility, it is characterized in that: comprise the rock core fastener for the tested core of clamping, be laid in the insulating box in the rock core fastener outside, ring crimping mouth by conduit under fluid pressure and rock core fastener joins and the ring that the tested core that is sandwiched in rock core fastener inside applies circumferential pressure is pressed feedway, the chemical agent storage tank that inlet by chemical agent conveyance conduit and rock core fastener joins, ultrasonic transducer, join with ultrasonic transducer and the supersonic generator of the high-frequency ac signal of telecommunication is provided for ultrasonic transducer, the liquid container that inlet by aqueduct and oil pipeline and rock core fastener joins and the inner water tank that simulated formation water and simulated formation oil is housed respectively and oil storage tank and the liquid outlet by external pipe and rock core fastener join respectively, described liquid container is marked with the scale that its inside institute storing solution volume is measured, described aqueduct, on oil pipeline and the chemical agent conveyance conduit waterway controlling valve is housed respectively, oil passage control valve and chemical agent pipage control valve; On described aqueduct, oil pipeline and the chemical agent conveyance conduit pumping equipment is housed all; Described ultrasonic transducer joins by the liquid outlet of connecting pipe and rock core fastener; Be separately installed with pressure detecting and display unit one and pressure detecting and display unit two on the inlet of described rock core fastener and the liquid outlet.
Above-mentioned a kind of ultrasonic-assisted reservoir stratum chemical blockage removal experimental facility is characterized in that: described ultrasonic transducer is induction ultrasonic transducer.
Above-mentioned a kind of ultrasonic-assisted reservoir stratum chemical blockage removal experimental facility, it is characterized in that: described induction ultrasonic transducer comprises that inside has the can of closed cavity, be laid in described closed cavity front portion and can produce hyperacoustic vibration template, be fixed as one with vibration template and be laid in the plane inductive coil of vibration template rear side, with plane inductive coil phase and the capacitor that connects and the power supply that is attempted by the capacitor two ends, be connected by wire one between described plane inductive coil and the capacitor, be connected described plane inductive coil by wire two between described capacitor and the power supply, the conductor resistance of capacitor and described wire one forms the RLC oscillating circuit; The forward exterior of described can is laid with for the ultrasonic variable amplitude bar that changes ultrasonic amplitude that vibration template produces, and described ultrasonic variable amplitude rod seal is installed on the liquid outlet of rock core fastener; The output of described supersonic generator and the power end of power supply join, and are serially connected with respectively make-and-break control switch one and make-and-break control switch two on described wire one and the wire two.
Above-mentioned a kind of ultrasonic-assisted reservoir stratum chemical blockage removal experimental facility, it is characterized in that: described closed cavity is cylindrical cavity, vibration template be the diameter of circular slab and described circular slab less than the diameter of described closed cavity, plane inductive coil is that circular flat coil and its diameter are less than the diameter of described circular slab.
Above-mentioned a kind of ultrasonic-assisted reservoir stratum chemical blockage removal experimental facility, it is characterized in that: described make-and-break control switch one and described make-and-break control switch two share a single-pole double-throw switch (SPDT) K, the fixed terminals of described single-pole double-throw switch (SPDT) K is joined by wire and capacitor, and two other movable terminals of described single-pole double-throw switch (SPDT) K join with plane inductive coil and power supply by wire one and wire two respectively.
Above-mentioned a kind of ultrasonic-assisted reservoir stratum chemical blockage removal experimental facility, it is characterized in that: described water tank, oil storage tank and chemical agent storage tank share a displacing fluid storage tank, described aqueduct, oil pipeline and chemical agent conveyance conduit share a conveyance conduit, described waterway controlling valve, oil passage control valve and chemical agent pipage control valve share a by-pass valve control, and described aqueduct, oil pipeline and chemical agent conveyance conduit share a pumping equipment.
Above-mentioned a kind of ultrasonic-assisted reservoir stratum chemical blockage removal experimental facility is characterized in that: described pumping equipment is that plunger displacement pump and plunger displacement pump join by pipeline and pump power liquid storage tank.
Above-mentioned a kind of ultrasonic-assisted reservoir stratum chemical blockage removal experimental facility is characterized in that: described liquid container is graded tube, and described graded tube is that scale unit is the glass cylinder of 0.1ml.
Above-mentioned a kind of ultrasonic-assisted reservoir stratum chemical blockage removal experimental facility, it is characterized in that: the clamper shell, coaxial package that described rock core fastener comprises the equal opening in two ends, the left and right sides is in the clamper shell and the rubber separation sleeve of the equal opening in two ends, the left and right sides and two plug that respectively left and right sides both ends open of clamper shell and rubber separation sleeve carried out shutoff, and described tested core coaxial package is inner at the rubber separation sleeve; Have two vertical liquid outlets that communicate with its inner chamber on the upper portion side wall of described clamper shell, a vertical liquid outlet in two vertical liquid outlets presses feedway to join by conduit under fluid pressure and ring, and another vertical liquid outlet is equipped with pressure meter three; Have two horizontal inlets and two horizontal liquid outlets on two plugs, two horizontal inlets and two horizontal liquid outlets all communicate with the inner chamber of rubber separation sleeve; A horizontal inlet in two horizontal inlets joins with described aqueduct, oil pipeline and chemical agent conveyance conduit respectively, and described pressure detecting and display unit one are installed on another horizontal inlet; A horizontal liquid outlet in two horizontal liquid outlets joins by external pipe and described liquid container, and described pressure detecting and display unit two are installed on another horizontal liquid outlet.
Simultaneously, the invention also discloses a kind of easy and simple to handle, realize convenient, flexible operation mode and the ultrasonic-assisted reservoir stratum chemical blockage removal experimental technique that DATA REASONING is accurate, simulated experiment is effective, it is characterized in that the method may further comprise the steps:
201, with tested core drying, vacuumize with the saturation simulation formation water after pack in the rock core fastener; Again according to the ambient temperature conditions of need simulated formation, by heater rock core fastener is heated to the environment temperature that needs simulated formation together with the tested core that is sandwiched in its inside, after the environment temperature to needing simulated formation to be heated described thermostat is laid in the rock core fastener outside;
202, parameter adjustment: according to the reservoir pressure condition of need simulated formation, and press feedway to control adjustment by described controller to ring, so that the circumferential pressure that ring presses feedway to be carried on the tested core is identical with reservoir pressure that need simulated formation;
203, water drive is replaced simulated experiment: close oil passage control valve and chemical agent pipage control valve and open waterway controlling valve, start simultaneously ring and press feedway and the pumping equipment that is installed on the described aqueduct, realize by the simulated formation water in water tank is transported to rock core fastener tested core being carried out water drive for dynamic simulation experiment; And water drive is in the dynamic simulation experiment process, the water yield of displacing in described pressure detecting and display unit one and pressure detecting and the display unit two real-time hydraulic pressure that detect and the described liquid container is carried out Continuous Observation, displace the water yield when constant within the difference of the hydraulic pressure that detects between described pressure detecting and display unit one and pressure detecting and the display unit two keeps stable and described liquid container, then water drive finishes for dynamic simulation experiment; For the simulated formation water yield used in the dynamic simulation experiment process and according to the conventional Calculation Method of waterflood permeability, calculate the initial waterflood permeability of test core according to water drive;
Afterwards, close waterway controlling valve and oil passage control valve and open chemical agent pipage control valve, start simultaneously the pumping equipment that is installed on the described oil pipeline, according to testing the in advance pollution type of design, the core pollution of storing in the chemical agent storage tank is delivered in the rock core fastener with chemical agent, and so that the tested core that is sandwiched in the rock core fastener is in pollutional condition;
Step 5, ultrasonic wave assistant chemical reagent de-plugging experiment, its experimentation is as follows:
501, parameter adjustment: the running parameter to supersonic generator adjusts accordingly and the running parameter after adjusting is done with record, and by adjusting the running parameter of supersonic generator, tackle mutually that ultrasonic transducer produces hyperacoustic frequency and amplitude is adjusted;
502, equipment prerun: open supersonic generator and ultrasonic transducer and carry out prerun, and the prerun time is 10min～30min;
503, under the supersonic oscillations condition, with chemical agent the tested core that is in pollutional condition is carried out the chemical plugging removal experiment by the chemical plugging removal of transporting to from the chemical agent storage tank in the rock core fastener; And carry out chemical plugging removal when experiment, can realize when carrying out supersonic oscillations, carrying out chemical plugging removal, carry out chemical plugging removal first and carry out again supersonic oscillations and carry out first supersonic oscillations and carry out again three kinds of chemical plugging removal simulated experiments of chemical plugging removal;
When the need simulation is carried out chemical plugging removal when carrying out supersonic oscillations, then after described supersonic generator and the end of ultrasonic transducer prerun, close oil passage control valve and open waterway controlling valve, chemical agent pipage control valve and supersonic generator and ultrasonic transducer, realization is carried out chemical plugging removal experiment with chemical agent to the tested core that is in pollutional condition by the chemical plugging removal of transporting to from the chemical agent storage tank in the rock core fastener under supersonic oscillations and chemical agent de-plugging double condition;
When need simulations is carried out first chemical plugging removal when carrying out the supersonic oscillations experiment again, then after supersonic generator and the end of ultrasonic transducer prerun, close first oil passage control valve, waterway controlling valve and supersonic generator and ultrasonic transducer and open chemical agent pipage control valve, with chemical agent the tested core that is in pollutional condition is carried out the chemical plugging removal experiment by the chemical plugging removal of transporting to from the chemical agent storage tank in the rock core fastener; When chemical plugging removal experimental period to be set finishes, close again oil passage control valve, waterway controlling valve and chemical agent pipage control valve and open supersonic generator and ultrasonic transducer, the tested core after the chemical plugging removal experiment is carried out supersonic oscillations;
When need simulations is carried out first supersonic oscillations when carrying out chemical plugging removal again, then after supersonic generator and the end of ultrasonic transducer prerun, close first oil passage control valve, waterway controlling valve and chemical agent pipage control valve and open supersonic generator and ultrasonic transducer, the tested core that is in pollutional condition is carried out the supersonic oscillations experiment; When supersonic oscillations experimental period to be set finishes, close again oil passage control valve, waterway controlling valve and supersonic generator and ultrasonic transducer and open chemical agent pipage control valve, by transport to from the chemical agent storage tank chemical plugging removal in the rock core fastener with chemical agent to carrying out the chemical plugging removal experiment through supersonic oscillations and the tested core that is in pollutional condition;
Carry out in the step 5 in the ultrasonic wave assistant chemical reagent de-plugging experimentation, ring presses feedway to be in all the time opening;
The experiment of step 6, water drive and the corresponding waterflood permeability that records behind the tested core chemical plugging removal: according to the described water drive of step 203 for analogue experiment method, tested core after the de-plugging of ultrasonic wave assistant chemical reagent in the step 5 is carried out water drive for simulated experiment, and calculate waterflood permeability behind the tested core chemical plugging removal according to measured data in the experimentation;
Step 7, change tested core, and repeating step one carries out dynamic simulation experiment to a plurality of tested cores that are replaced respectively to step 6; Repeatedly in the dynamic simulation experiment, it is all not identical with amplitude that ultrasonic transducer described in the step 5 produces hyperacoustic frequency, then carry out each time ultrasonic wave assistant chemical reagent de-plugging when experiment, in step 501, all need ultrasonic transducer is produced hyperacoustic frequency and amplitude is adjusted;
Step 8, data preparation: the waterflood permeability in the waterflood permeability after the tested core that calculates in the initial waterflood permeability of the tested core that calculates in the step 2, the step 4 polluted and the step 6 behind the tested core chemical plugging removal compares; Simultaneously, in the step 7 under different frequency and various amplitude supersonic oscillations condition the waterflood permeability of tested core compare, and comparing result is carried out synchronous recording.
The present invention compared with prior art has the following advantages:
1, apparatus structure is simple, reasonable in design and install to lay conveniently, uses simple to operately, and input cost is low, can finish efficiently, fast the chemical plugging removal of reservoir and test.
2, practical value is high and popularizing application prospect is extensive, the present invention carries out indoor deep acidizing and chemical plugging removal dynamic simulation experiment with different frequency, various amplitude ultrasonic wave, and corresponding formation ultrasound waves assistant chemical de-plugging experimental technique, existing reservoir depth acidifying and chemical plugging removal technology are innovated, the indoor deep acidizing that under different frequency supersonic oscillations condition, carries out and chemical plugging removal dynamic simulation experiment, have good chemical plugging removal effect, and can effectively enlarge in the exploitation that is applied to the oil field middle and later periods.
3, chemical plugging removal is effective, ultrasonic wave assistant chemical de-plugging proposed by the invention is to adopt the auxiliary reservoir core acidifying of the ultrasonic wave of different frequency, different capacity and chemical plugging removal dynamic simulation experiment, take full advantage of the cooperative effect between ultrasonic wave physical field and chemical agent: wherein, hyperacoustic wave action can improve the chemical agent activity, prolongs chemical agent operating distance and period of validity; Chemical agent reaction, corrosion function solubilized, loosening reservoir obstruction, and then improve the ul-trasonic irradiation effect.And in the increasing yield and injection that this technology is progressively enlarged special reservoirs such as being applied to hypotonic, special hypotonic, viscous crude, super viscous crude and the raising oil recovery factor.
4, the cost that exists for conventional acidifying and chemical plugging removal technology is high and to problems such as reservoir, environment pollution are large, the present invention can improve the operating efficiency of oil-water well increasing yield and injection to a greater extent, and improve the recovery ratio of crude oil, simultaneously to external world environment almost without any pollution.
5, the present invention is by applying the ultrasonic vibration effect of different frequency, power to the fluid in the pipeline, specifically by core being applied the ul-trasonic irradiation of different frequency, power, and in the saturated fluid porous media, set up oscillator field, act on oil reservoir with strong alternating pressure, in oil reservoir, produce periodic effect of stress, the blowhole medium is produced shear action, the obstruction material on blowhole surface is come off by vibration, remove pore throat and stop up.Under hyperacoustic effect, the mechanical admixture in the near wellbore formation duct and the adhesion between cell walls will wreck under fatigue stress, peel off gradually, and flow into pit shaft with the motion of fluid in the stratum, reach and remove the purpose that stratum impurity stops up.When pressure wave amplitude with intensity reaches or during near rock rupture pressure, the near wellbore zone, stratum will form the microcrack network, under the periodic pressure effect, along with Wave energy gathers, strut gradually the crack of depths, stratum, link up fluid course, play the de-plugging effect.Different frequency, power compression wave also can exert an influence to physical property and the fluidised form of reservoir fluid, solid liquid interface can be changed dynamic, overcome the absorption affinity of rock particles surface crude oil, make oil film come off, destroy or change hollow billet equilibrium of forces in the micropore, overcome the constraint retention effect of capillary force, thereby weaken the liquid inhibition effect, reduce flow resistance, can greatly bring into play the oil reservoir productive potentialities.
6, stable work in work, reliable can be widely used in the stratum characteristic research of oil field development research and other industry, for actual production provides scientific basis.
7, efficient, free of contamination physical solution plugging technique and conventional chemical block releasing technique connection are done, by hyperacoustic vibration spalling effect, make seam effect etc., can reduce the chemical plugging removal agent in the consumption of nearly well band, prolong chemical plugging removal agent penetration range and period of validity, and the chemical agent of vibration has higher activity, so that the composite blockage relieving effect will be significantly improved.
8, use easy and simple to handle and the use flexible operation mode, carry out chemical plugging removal when experiment, can realize when carrying out supersonic oscillations, carrying out chemical plugging removal, carry out chemical plugging removal first and carry out again supersonic oscillations and carry out first supersonic oscillations and carry out again three kinds of chemical plugging removal simulated experiments of chemical plugging removal.
9, simulated formation temperature of the present invention: 25～120 ℃, simulating oil deposit pressure: 5～25MPa, analog ultrasonic wave frequency: 18～50KHz; Agent is used in experiment: the acidifying solution such as hydrochloric acid, hydrofluoric acid, mud acid, strong oxidizer, solvent, heat chemistry agent and chemical plugging removal agent etc.
10, stable working state, utilize ultrasonic transducer with on the core of ultrasonic pressing in the rock core fastener, in the ultrasonic wave assistant chemical reagent de-plugging experiment, ultrasonic wave carries out displacement to the crude oil in the core when finishing chemical plugging removal, the time of the each experiment of record, record corresponding with time oil mass, the water yield and the force value of displacing; Carry out data and process, can draw the ultimate recovery of core under the ultrasonic vibration condition, residual oil saturation.Simultaneously, the present invention utilizes wave field to assist the core chemical plugging removal, and time, the water yield and the force value of the each experiment of record are carried out data and processed, and can draw the recovery extent of drill core permeability rate under the vibration condition.
11, widely applicable, the present invention is the method on the core of ultrasonic pressing in the rock core fastener, so that the reservoir sensitivity experiment can move under the supersonic oscillations condition, and can corresponding draw the sensitiveness feature of core under the supersonic oscillations condition; Simultaneously, can corresponding ultimate recovery and the residual oil saturation that draws core under the supersonic oscillations condition.Thereby the present invention can effectively promote in the applicable reservoir sensitivity experiment and the reservoir stratum chemical blockage removal experiment of other industry to the supersonic oscillations condition.Thereby the present invention can be widely used in the stratum characteristic research of oil field development research and other industry, for actual production provides scientific basis.
To sum up, the present invention is reasonable in design, convenience, perfect in shape and function are laid in installation and it is easy and simple to handle to use, result of use good, can under ul-trasonic irradiation, realize the fluctuation of chemical plugging removal, oil reservoir is played quantitative water distribution and supersonic oscillations processing effect, make supersonic oscillations become long-term preventive action, and can improve actual chemical plugging removal effect, prolong the de-plugging period of validity.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Fig. 1 is the use state reference map of ultrasonic-assisted reservoir stratum chemical blockage removal experimental facility of the present invention.
Fig. 2 is the structural representation of ultrasonic transducer of the present invention.
Fig. 3 is the syndeton schematic diagram of rock core fastener of the present invention and ultrasonic transducer.
Fig. 4 is the schematic block circuit diagram of ultrasonic-assisted reservoir stratum chemical blockage removal experimental facility of the present invention.
Fig. 5 is the method flow diagram that the present invention carries out the ultrasonic-assisted reservoir stratum chemical blockage removal experiment.
Description of reference numerals:
The tested core of 1-; The 2-rock core fastener; 2-1-clamper shell;
The 2-2-plug; The horizontal inlet of 2-3-; The horizontal liquid outlet of 2-4-;
2-6-rubber separation sleeve; The vertical liquid outlet of 2-7-; The 2-8-packing ring;
2-9-pressure meter three; The 2-10-supporting leg; The 3-conduit under fluid pressure;
The 4-ring is pressed feedway; The 9-plunger displacement pump; The 10-glass cylinder;
The 12-ultrasonic transducer; The 12-1-vibration template; The 12-2-plane inductive coil;
The 12-3-capacitor; The 12-4-power supply; The 12-5-ultrasonic variable amplitude bar;
The 12-6-can; The 13-supersonic generator; 14-displacing fluid storage tank;
The 15-conveyance conduit; The 18-by-pass valve control; The 19-controller;
The 20-parameter set unit; 22-pressure meter one; 23-pressure meter two;
24-pump power liquid storage tank.
The specific embodiment
Such as Fig. 1, a kind of ultrasonic-assisted reservoir stratum chemical blockage removal experimental facility shown in Figure 4, comprise the rock core fastener 2 for the tested core 1 of clamping, be laid in the insulating box in rock core fastener 2 outsides, ring crimping mouth by conduit under fluid pressure 3 and rock core fastener 2 joins and the ring that the tested core 1 that is sandwiched in rock core fastener 2 inside applies circumferential pressure is pressed feedway 4, the chemical agent storage tank that inlet by chemical agent conveyance conduit and rock core fastener 2 joins, ultrasonic transducer 12, join with ultrasonic transducer 12 and the supersonic generator 13 of the high-frequency ac signal of telecommunication is provided for ultrasonic transducer 12, the liquid container that inlet by aqueduct and oil pipeline and rock core fastener 2 joins and the inner water tank that simulated formation water and simulated formation oil is housed respectively and oil storage tank and the liquid outlet by external pipe and rock core fastener 2 join respectively, described liquid container is marked with the scale that its inside institute storing solution volume is measured, described aqueduct, on oil pipeline and the chemical agent conveyance conduit waterway controlling valve is housed respectively, oil passage control valve and chemical agent pipage control valve; On described aqueduct, oil pipeline and the chemical agent conveyance conduit pumping equipment is housed all.Described ultrasonic transducer 12 joins by the liquid outlet of connecting pipe and rock core fastener 2.Be separately installed with pressure detecting and display unit one and pressure detecting and display unit two on the inlet of described rock core fastener 2 and the liquid outlet.
In the actual use procedure, described water tank, oil storage tank and chemical agent storage tank are used for storing displacing fluid and buffering flow rate of liquid, and ultrasonic transducer 12 converts the high frequency electrical signal that supersonic generator provides to ultrasonic wave.In the present embodiment, described pressure sensing cell one and described pressure sensing cell two are pressure meter.The output pressure of described plunger displacement pump 9 is 0～42Mpa and its flow 0～9.9mL/min, and described pressure detecting and display unit one are the pressure meter 1 of 0～15MPa for range, and described pressure detecting and display unit two are the pressure meter 2 23 of 0～1MPa for range.
In the present embodiment, described ultrasonic transducer 12 is induction ultrasonic transducer.In conjunction with Fig. 2, described induction ultrasonic transducer comprises that inside has the can 12-6 of closed cavity, be laid in described closed cavity front portion and can produce hyperacoustic vibration template 12-1, be fixed as one with vibration template 12-1 and be laid in the plane inductive coil 12-2 of vibration template 12-1 rear side, with plane inductive coil 12-2 phase and the capacitor 12-3 that connects and the power supply 12-4 that is attempted by capacitor 12-3 end, be connected by wire one between described plane inductive coil 12-2 and the capacitor 12-3, be connected described plane inductive coil 12-2 by wire two between described capacitor 12-3 and the power supply 12-4, the conductor resistance of capacitor 12-3 and described wire one forms the RLC oscillating circuit; The forward exterior of described can is laid with for the ultrasonic variable amplitude bar 12-5 that changes vibration template ultrasonic amplitude that 12-1 produces, and described ultrasonic variable amplitude bar 12-5 sealing is installed on the liquid outlet of rock core fastener 2.The power end of the output of described supersonic generator 13 and power supply 12-4 joins, and is serially connected with respectively make-and-break control switch one and make-and-break control switch two on described wire one and the wire two.
In the present embodiment, described closed cavity is cylindrical cavity, vibration template 12-1 be the diameter of circular slab and described circular slab less than the diameter of described closed cavity, plane inductive coil 12-2 is that circular flat coil and its diameter are less than the diameter of described circular slab.Described make-and-break control switch one and described make-and-break control switch two share a single-pole double-throw switch (SPDT) K, the fixed terminals of described single-pole double-throw switch (SPDT) K is joined by wire and capacitor 12-3, and two other movable terminals of described single-pole double-throw switch (SPDT) K join with plane inductive coil 12-2 and power supply 12-4 by wire one and wire two respectively.
In the present embodiment, described vibration template 12-1 is aluminium sheet, and described ultrasonic variable amplitude bar 12-5 and can 12-6 processing and fabricating are integrated.Described sealed cavity, vibration template 12-1, plane inductive coil 12-2 and ultrasonic variable amplitude bar 12-5 are coaxial laying.
During actual the use, give first capacitor 12-3 charging by power supply 12-4, and then by plane inductive coil 12-2 discharge.In the plane inductive coil 12-2 discharge process, to produce the sinusoidal current of pressing the index law decay in the described RLC oscillating circuit, this sinusoidal current produces an alternating magnetic field in plane inductive coil 12-2, the magnetic line of force of this alternating magnetic field passes vibration template 12-1, and correspondingly in vibration template 12-1, form eddy current, the effect of the power of alternation is arranged between the formed eddy current in the electric current among the plane inductive coil 12-2 and the vibration template 12-1, make vibration template 12-1 generation vibration and send ultrasonic wave.
In the present embodiment, described pumping equipment is that plunger displacement pump 9 and plunger displacement pump 9 join by pipeline and pump power liquid storage tank 24.Described liquid container is graded tube, and described graded tube is that scale unit is the glass cylinder 10 of 0.1ml.During actual the use, also can select other scale unit is the glass cylinder 10 of 0.1ml.
In the present embodiment, described water tank, oil storage tank and chemical agent storage tank share a displacing fluid storage tank 14, described aqueduct, oil pipeline and chemical agent conveyance conduit share a conveyance conduit 15, described waterway controlling valve, oil passage control valve and chemical agent pipage control valve share a by-pass valve control 18, and described aqueduct, oil pipeline and chemical agent conveyance conduit share a pumping equipment.Reality is carried out water drive, when oil drives, makes core pollution and chemical plugging removal, is only needed that displacing fluid storage tank 14 interior institute storing solutions are carried out corresponding replacement and get final product the tested core 1 that are sandwiched in the rock core fastener 2.
In the actual use procedure, also described water tank and oil storage tank can be shared a displacing fluid storage tank 14, described aqueduct and oil pipeline share a conveyance conduit 15, described waterway controlling valve and oil passage control valve share a by-pass valve control, and described aqueduct and the shared pumping equipment of oil pipeline.In addition, be provided with separately a chemical agent storage tank and a chemical agent conveyance conduit.
In conjunction with Fig. 3, in the present embodiment, the clamper shell 2-1, coaxial package that described rock core fastener 2 comprises the equal opening in two ends, the left and right sides is in clamper shell 2-1 and the rubber separation sleeve 2-6 of the equal opening in two ends, the left and right sides and two the plug 2-2 that respectively left and right sides both ends open of clamper shell 2-1 and rubber separation sleeve 2-6 (being rubber tube) carried out shutoff, and described tested core 1 coaxial package is inner at rubber separation sleeve 2-6.Have two vertical liquid outlet 2-7 that communicate with its inner chamber on the upper portion side wall of described clamper shell 2-1, a vertical liquid outlet 2-7 among two vertical liquid outlet 2-7 presses feedway 4 to join (this vertical liquid outlet 2-7 is ring crimping mouth) by conduit under fluid pressure 3 and ring, and another vertical liquid outlet 2-7 is equipped with pressure meter three 2-9.Have two horizontal inlet 2-3 and two horizontal liquid outlet 2-4 on two plug 2-2, two horizontal inlet 2-3 and two horizontal liquid outlet 2-4 all communicate with the inner chamber of rubber separation sleeve 2-6.A horizontal inlet 2-3 among two horizontal inlet 2-3 joins with described aqueduct, oil pipeline and chemical agent conveyance conduit respectively, and pressure meter 1 is installed on another horizontal inlet 2-3.A horizontal liquid outlet 2-4 among two horizontal liquid outlet 2-4 joins by external pipe and described liquid container, and pressure meter 2 23 is installed in another horizontal liquid outlet 2-4.Pad is equipped with packing ring 2-8 between the left and right end portions of the leading section of two plug 2-2 and tested core 1, and clamper shell 2-1 bottom is provided with supporting leg 2-10.
In the present embodiment, on described horizontal inlet 2-3, horizontal liquid outlet 2-4 and the vertical liquid outlet 2-7 pipeline clamping cap is installed all, and described pipeline clamping cap is by 1Cr17Ni9Ti machine-shaping, plug 2-2 is by 1Cr17Ni9Ti machine-shaping, clamper shell 2-1 is by 1Cr17Ni9Ti machine-shaping, and packing ring 2-8 is by 1Cr17Ni9Ti machine-shaping.During actual installation, first at clamper shell 2-1 one end plug 2-2 is installed, tested core 1 is packed into behind the clamper shell 2-1, the plug 2-2 of the other end is installed again.
In the present embodiment, two horizontal inlet 2-3 open in the left side of clamper shell 2-1, and two horizontal liquid outlet 2-4 open on the right side of clamper shell 2-1,
The described ultrasonic variable amplitude bar 12-5 from right to left plug 2-2 from clamper shell 2-1 right side is inserted into the set packing ring 2-8 in right part that inner and its leading section of clamper shell 2-1 is tight against tested core 1, and form two horizontal liquid outlet 2-4 between the plug 2-2 on ultrasonic variable amplitude bar 12-5 and right side, the plug 2-2 middle part on clamper shell 2-1 right side has the through hole that laterally penetrates for ultrasonic variable amplitude bar 12-5.In the present embodiment, described liquid container and pressure meter 2 23 communicate with two horizontal liquid outlet 2-4 inside by a vertical drain pipe respectively.
Simultaneously, ultrasonic-assisted reservoir stratum chemical blockage removal experimental facility of the present invention also comprises controller 19 and the parameter set unit 20 of joining with controller 19, and described waterway controlling valve, oil passage control valve and chemical agent pipage control valve (being by-pass valve control 18) are solenoid electric valve.Described by-pass valve control 18 and hydraulic oil pipage control valve 8 all join with controller 19 and control by controller 19.Described plunger displacement pump 9 joins with controller 19 and is controlled by controller 19.In addition, in the actual mechanical process, described pressure detecting and display unit one and pressure detecting and display unit two can also detect conveying hydraulic pressure and oil pressure by adopts pressure sensor in real time, and institute's detection signal is sent to respectively controller 19 synchronously, and by the display that joins with controller 19 institute's detected pressures is carried out simultaneous display.
To sum up, pump power liquid storage tank 24 is used for being stored into pump power liquid, such as kerosene, distilled water etc.Described displacing fluid storage tank 14 is by the machine-shaping of 1Cr18Ni9Ti steel plate, capacity 2L, withstand voltage 25Mpa, the outlet on the top of displacing fluid storage tank 14 and the import department of bottom all are equipped with high pressure valve, piston stroking upward from band press liquid (referring to pump power liquid) the promotion displacing fluid storage tank 14 that import enters, piston is the displacing fluid motion of pushing piston top again, delivers to the inlet of rock core fastener 2 after the outlet of top.Described pressure detecting and display unit one are used for measuring displacement pressure, rock core fastener 2 is used for fixing tested core 1, ring presses feedway 4 (the concrete ring press pump that adopts) to apply the stratum simulated pressure to tested core 1 periphery that is sandwiched in the rock core fastener 2, described pressure detecting and display unit two are used for measuring the displacement outlet pressure, and described liquid container is used for measuring the displacement liquid outlet quantity.The high frequency electrical signal that described ultrasonic transducer 12 provides supersonic generator 13 converts ultrasonic wave to and acts on the core.The base of described pressure detecting and display unit one and pressure detecting and display unit two is six-way valve, uses 1Cr18Ni9Ti machine-shaping.
A kind of ultrasonic-assisted reservoir stratum chemical blockage removal experimental technique as shown in Figure 5 may further comprise the steps:
201, with tested core 1 drying, vacuumize with the saturation simulation formation water after pack in the rock core fastener 2; Again according to the ambient temperature conditions of need simulated formation, by heater rock core fastener 2 is heated to the environment temperature that needs simulated formation together with the tested core that is sandwiched in its inside, after the environment temperature to needing simulated formation to be heated described thermostat is laid in rock core fastener 2 outsides.
202, parameter adjustment: according to the reservoir pressure condition of need simulated formation, and press feedway 4 to control adjustment by described controller to ring, so that the circumferential pressure that ring presses feedway 4 to be carried on the tested core is identical with the reservoir pressure that needs simulated formation.
203, water drive is replaced simulated experiment: close oil passage control valve and chemical agent pipage control valve and open waterway controlling valve, start simultaneously ring and press feedway 4 and the pumping equipment that is installed on the described aqueduct, realize by the simulated formation water of transporting to from water tank in the rock core fastener 2 tested core 1 being carried out water drive for dynamic simulation experiment; And water drive is in the dynamic simulation experiment process, the water yield of displacing in described pressure detecting and display unit one and pressure detecting and the display unit two real-time hydraulic pressure that detect and the described liquid container is carried out Continuous Observation, displace the water yield when constant within the difference of the hydraulic pressure that detects between described pressure detecting and display unit one and pressure detecting and the display unit two keeps stable and described liquid container, then water drive finishes for dynamic simulation experiment; For the simulated formation water yield used in the dynamic simulation experiment process and according to the conventional Calculation Method of waterflood permeability, calculate the initial waterflood permeability of test core 1 according to water drive.
Afterwards, close waterway controlling valve and oil passage control valve and open chemical agent pipage control valve, start simultaneously the pumping equipment that is installed on the described oil pipeline, according to testing the in advance pollution type of design, the core pollution of storing in the chemical agent storage tank is delivered in the rock core fastener 2 with chemical agent, and so that the tested cores 1 that are sandwiched in the rock core fastener 2 are in pollutional condition.
Step 5, ultrasonic wave assistant chemical reagent de-plugging experiment, its experimentation is as follows:
501, parameter adjustment: the running parameter to supersonic generator 13 adjusts accordingly and the running parameter after adjusting is done with record, and by adjusting the running parameter of supersonic generator 13, tackle mutually ultrasonic transducer 12 produce hyperacoustic frequency and amplitude is adjusted.
502, equipment prerun: open supersonic generator 13 and ultrasonic transducer 12 and carry out prerun, and the prerun time is 10min～30min.
503, with chemical agent the tested core 1 that is in pollutional condition is being carried out the chemical plugging removal experiment by the chemical plugging removal in the chemical agent storage tank is transported to rock core fastener 2 under the supersonic oscillations condition; And carry out chemical plugging removal when experiment, can realize when carrying out supersonic oscillations, carrying out chemical plugging removal, carry out chemical plugging removal first and carry out again supersonic oscillations and carry out first supersonic oscillations and carry out again three kinds of chemical plugging removal simulated experiments of chemical plugging removal.
When the need simulation is carried out chemical plugging removal when carrying out supersonic oscillations, then after described supersonic generator 13 and the end of ultrasonic transducer 12 preruns, close oil passage control valve and open waterway controlling valve, chemical agent pipage control valve and supersonic generator 13 and ultrasonic transducer 12, realization is carried out chemical plugging removal experiment with chemical agent to the tested core 1 that is in pollutional condition by the chemical plugging removal in the chemical agent storage tank is transported to rock core fastener 2 under supersonic oscillations and chemical agent de-plugging double condition.
When need simulations is carried out first chemical plugging removal when carrying out the supersonic oscillations experiment again, then after supersonic generator 13 and the end of ultrasonic transducer 12 preruns, close first oil passage control valve, waterway controlling valve and supersonic generator 13 and ultrasonic transducer 12 and open chemical agent pipage control valve, with chemical agent the tested core 1 that is in pollutional condition is carried out the chemical plugging removal experiment by the chemical plugging removal in the chemical agent storage tank is transported to rock core fastener 2; When chemical plugging removal experimental period to be set finishes, close again oil passage control valve, waterway controlling valve and chemical agent pipage control valve and open supersonic generator 13 and ultrasonic transducer 12, the tested core 1 after the chemical plugging removal experiment is carried out supersonic oscillations.
When need simulations is carried out first supersonic oscillations when carrying out chemical plugging removal again, then after supersonic generator 13 and the end of ultrasonic transducer 12 preruns, close first oil passage control valve, waterway controlling valve and chemical agent pipage control valve and open supersonic generator 13 and ultrasonic transducer 12, the tested core 1 that is in pollutional condition is carried out the supersonic oscillations experiment; When supersonic oscillations experimental period to be set finishes, close again oil passage control valve, waterway controlling valve and supersonic generator 13 and ultrasonic transducer 12 and open chemical agent pipage control valve, test carrying out chemical plugging removal through supersonic oscillations and the tested core 1 that is in pollutional condition with chemical agent by the chemical plugging removal from the chemical agent storage tank is transported to rock core fastener 2 in.
And in the ultrasonic wave assistant chemical reagent de-plugging experiment, when finishing chemical plugging removal, also carry out water drive for oily dynamic experiment, then in the ultrasonic wave assistant chemical reagent de-plugging experimentation, divide a plurality of time points that the relevant parameter in the ultrasonic wave assistant chemical reagent de-plugging experimentation is carried out respectively record, described relevant parameter comprises the writing time corresponding with each time point, displace oil mass, water supply volume, used hydraulic pressure value and circumferential pressure value, the described oil mass of displacing is displaced simulated formation oil quantity to the described liquid container for what test out by the scale on the described liquid container by tested core, described water supply volume is the simulated formation water number amount that consumes in the water tank, used hydraulic pressure value is the hydraulic pressure value that described pressure detecting and display unit one detect, and described circumferential pressure value is that ring pressure feedway 3 is carried in the circumferential pressure value on the tested core.
Carry out in the step 5 in the ultrasonic wave assistant chemical reagent de-plugging experimentation, ring presses feedway 4 to be in all the time opening.
The experiment of step 6, water drive and the corresponding waterflood permeability that records behind tested core 1 chemical plugging removal: according to the described water drive of step 203 for analogue experiment method, tested core 1 after the de-plugging of ultrasonic wave assistant chemical reagent in the step 5 is carried out water drive for simulated experiment, and calculate waterflood permeability behind tested core 1 chemical plugging removal according to measured data in the experimentation.
Step 7, the tested core 1 of replacing, and repeating step one carries out dynamic simulation experiment to a plurality of tested cores that are replaced 1 respectively to step 6; Repeatedly in the dynamic simulation experiment, ultrasonic transducer described in the step 5 12 hyperacoustic frequency that produces is all not identical with amplitude, then carry out each time ultrasonic wave assistant chemical reagent de-plugging when experiment, in step 501, all need to ultrasonic transducer 12 produce hyperacoustic frequency and amplitude is adjusted.
Step 8, data preparation: the waterflood permeability in the waterflood permeability after the tested core 1 that calculates in the initial waterflood permeability of the tested core 1 that calculates in the step 2, the step 4 polluted and the step 6 behind tested core 1 chemical plugging removal compares; Simultaneously, in the step 7 under different frequency and various amplitude supersonic oscillations condition the waterflood permeability of tested core 1 compare, and comparing result is carried out synchronous recording.
To sum up, can calculate under different frequency, the various amplitude supersonic oscillations condition by the present invention, the situation of change of the permeability of tested core 1 is for the increasing yield and injection effect of estimating the de-plugging of ultrasonic wave assistant chemical.
The above; it only is preferred embodiment of the present invention; be not that the present invention is imposed any restrictions, every any simple modification, change and equivalent structure of above embodiment being done according to the technology of the present invention essence changes, and all still belongs in the protection domain of technical solution of the present invention.
Claims (8)
1. ultrasonic-assisted reservoir stratum chemical blockage removal experimental facility, it is characterized in that: comprise the rock core fastener (2) for the tested core of clamping (1), be laid in the insulating box in rock core fastener (2) outside, ring crimping mouth by conduit under fluid pressure (3) and rock core fastener (2) joins and the ring that applies circumferential pressure to being sandwiched in the inner tested core (1) of rock core fastener (2) is pressed feedway (4), the chemical agent storage tank that inlet by chemical agent conveyance conduit and rock core fastener (2) joins, ultrasonic transducer (12), join with ultrasonic transducer (12) and the supersonic generator (13) of the high-frequency ac signal of telecommunication is provided for ultrasonic transducer (12), the liquid container that inlet by aqueduct and oil pipeline and rock core fastener (2) joins and the inner water tank that simulated formation water and simulated formation oil is housed respectively and oil storage tank and the liquid outlet by external pipe and rock core fastener (2) join respectively, described liquid container is marked with the scale that its inside institute storing solution volume is measured, described aqueduct, on oil pipeline and the chemical agent conveyance conduit waterway controlling valve is housed respectively, oil passage control valve and chemical agent pipage control valve; On described aqueduct, oil pipeline and the chemical agent conveyance conduit pumping equipment is housed all; Described ultrasonic transducer (12) joins by the liquid outlet of connecting pipe and rock core fastener (2); Be separately installed with pressure detecting and display unit one and pressure detecting and display unit two on the inlet of described rock core fastener (2) and the liquid outlet; Described ultrasonic transducer (12) is induction ultrasonic transducer; Described induction ultrasonic transducer comprises that inside has the can of closed cavity (12-6), be laid in described closed cavity front portion and can produce hyperacoustic vibration template (12-1), be fixed as one with vibration template (12-1) and be laid in the plane inductive coil (12-2) of vibration template (12-1) rear side, with plane inductive coil (12-2) phase and the capacitor (12-3) that connects and the power supply (12-4) that is attempted by capacitor (12-3) two ends, be connected by wire one between described plane inductive coil (12-2) and the capacitor (12-3), be connected described plane inductive coil (12-2) by wire two between described capacitor (12-3) and the power supply (12-4), the conductor resistance of capacitor (12-3) and described wire one forms the RLC oscillating circuit; The forward exterior of described can is laid with for the ultrasonic variable amplitude bar (12-5) that changes vibration template (12-1) ultrasonic amplitude that produces, and described ultrasonic variable amplitude bar (12-5) sealing is installed on the liquid outlet of rock core fastener (2); The power end of the output of described supersonic generator (13) and power supply (12-4) joins, and is serially connected with respectively make-and-break control switch one and make-and-break control switch two on described wire one and the wire two.
2. according to a kind of ultrasonic-assisted reservoir stratum chemical blockage removal experimental facility claimed in claim 1, it is characterized in that: described closed cavity is cylindrical cavity, vibration template (12-1) be the diameter of circular slab and described circular slab less than the diameter of described closed cavity, plane inductive coil (12-2) is that circular flat coil and its diameter are less than the diameter of described circular slab.
3. according to claim 1 or 2 described a kind of ultrasonic-assisted reservoir stratum chemical blockage removal experimental facilities, it is characterized in that: described make-and-break control switch one and described make-and-break control switch two share a single-pole double-throw switch (SPDT) K, the fixed terminals of described single-pole double-throw switch (SPDT) K is joined by wire and capacitor (12-3), and two other movable terminals of described single-pole double-throw switch (SPDT) K join with plane inductive coil (12-2) and power supply (12-4) by wire one and wire two respectively.
4. according to claim 1 or 2 described a kind of ultrasonic-assisted reservoir stratum chemical blockage removal experimental facilities, it is characterized in that: described water tank, oil storage tank and chemical agent storage tank share a displacing fluid storage tank (14), described aqueduct, oil pipeline and chemical agent conveyance conduit share a conveyance conduit (15), described waterway controlling valve, oil passage control valve and chemical agent pipage control valve share a by-pass valve control (18), and described aqueduct, oil pipeline and chemical agent conveyance conduit share a pumping equipment.
5. according to a kind of ultrasonic-assisted reservoir stratum chemical blockage removal experimental facility claimed in claim 4, it is characterized in that: described pumping equipment is that plunger displacement pump (9) and plunger displacement pump (9) join by pipeline and pump power liquid storage tank (24).
6. according to claim 1 or 2 described a kind of ultrasonic-assisted reservoir stratum chemical blockage removal experimental facilities, it is characterized in that: described liquid container is graded tube, and described graded tube is that scale unit is the glass cylinder (10) of 0.1ml.
7. according to claim 1 or 2 described a kind of ultrasonic-assisted reservoir stratum chemical blockage removal experimental facilities, it is characterized in that: described rock core fastener (2) comprises the clamper shell (2-1) of the equal opening in two ends, the left and right sides, coaxial package is in clamper shell (2-1) and the rubber separation sleeve (2-6) of the equal opening in two ends, the left and right sides and two plugs (2-2) that respectively left and right sides both ends open of clamper shell (2-1) and rubber separation sleeve (2-6) carried out shutoff, and described tested core (1) coaxial package is in rubber separation sleeve (2-6) inside; Have two the vertical liquid outlets (2-7) that communicate with its inner chamber on the upper portion side wall of described clamper shell (2-1), vertical liquid outlet (2-7) in two vertical liquid outlets (2-7) presses feedway (4) to join by conduit under fluid pressure (3) and ring, and another vertical liquid outlet (2-7) is equipped with pressure meter three (2-9); Have two horizontal inlets (2-3) and two horizontal liquid outlets (2-4) on two plugs (2-2), two horizontal inlets (2-3) and two horizontal liquid outlets (2-4) all communicate with the inner chamber of rubber separation sleeve (2-6); Horizontal inlet (2-3) in two horizontal inlets (2-3) joins with described aqueduct, oil pipeline and chemical agent conveyance conduit respectively, and described pressure detecting and display unit one are installed on another horizontal inlet (2-3); Horizontal liquid outlet (2-4) in two horizontal liquid outlets (2-4) joins by external pipe and described liquid container, and described pressure detecting and display unit two are installed on another horizontal liquid outlet (2-4).
8. one kind is utilized a kind of ultrasonic-assisted reservoir stratum chemical blockage removal experimental facility as claimed in claim 1 to carry out the experimental technique of chemical plugging removal, it is characterized in that the method may further comprise the steps:
Step 1, tested core preliminary treatment: at first, the external dimensions of tested core (1) is measured, simultaneously the dry weight of the tested core (1) after the drying is carried out weighing, and measurement result and weighing result are carried out record; Again according to conventional oleic permeability method of testing, with tested core (1) drying, vacuumize with the saturation simulation formation water after carry out again weighing, and the weight in wet base of the tested core of corresponding acquisition (1) and weighing result carried out record; Subsequently, according to recorded, calculate voidage and the degree of porosity of tested core (1);
Step 2, water drive experiment and the corresponding initial waterflood permeability that records tested core (1), its experimentation is as follows:
201, with tested core (1) drying, vacuumize with the saturation simulation formation water after pack in the rock core fastener (2); Again according to the ambient temperature conditions of need simulated formation, by heater rock core fastener (2) is heated to the environment temperature that needs simulated formation together with the tested core that is sandwiched in its inside, after the environment temperature to needing simulated formation to be heated described thermostat is laid in rock core fastener (2) outside;
202, parameter adjustment: according to the reservoir pressure condition of need simulated formation, and press feedway (4) to control adjustment by described controller to ring, so that the circumferential pressure that ring presses feedway (4) to be carried on the tested core is identical with the reservoir pressure that needs simulated formation;
203, water drive is replaced simulated experiment: close oil passage control valve and chemical agent pipage control valve and open waterway controlling valve, start simultaneously ring and press feedway (4) and be installed in pumping equipment on the described aqueduct, realize tested core (1) is carried out water drive replacing dynamic simulation experiment by transport to simulated formation water in the rock core fastener (2) from water tank; And water drive is in the dynamic simulation experiment process, the water yield of displacing in described pressure detecting and display unit one and pressure detecting and the display unit two real-time hydraulic pressure that detect and the described liquid container is carried out Continuous Observation, displace the water yield when constant within the difference of the hydraulic pressure that detects between described pressure detecting and display unit one and pressure detecting and the display unit two keeps stable and described liquid container, then water drive finishes for dynamic simulation experiment; For the simulated formation water yield used in the dynamic simulation experiment process and according to the conventional Calculation Method of waterflood permeability, calculate the initial waterflood permeability of test core (1) according to water drive;
Step 3, the pollution type manufacturing core that designs in advance according to experiment pollute: at first, close waterway controlling valve and chemical agent pipage control valve and open oil passage control valve, start simultaneously the pumping equipment that is installed on the described oil pipeline, by the simulated formation oil of transporting to from oil storage tank in the rock core fastener (2) tested core (1) is carried out oily driven water-replacing dynamic simulation experiment; And in the oily driven water-replacing process, the water yield of displacing in described pressure detecting and the display unit two real-time hydraulic pressure that detect and the described liquid container is carried out Continuous Observation, within keeping stable and described liquid container, described pressure detecting and the display unit two hydraulic pressure numerical value that detects displaces the water yield when constant, then oily driven water-replacing dynamic simulation experiment finishes, and is in abundant saturated oils state in tested core this moment (1);
Afterwards, close waterway controlling valve and oil passage control valve and open chemical agent pipage control valve, start simultaneously the pumping equipment that is installed on the described oil pipeline, according to testing the in advance pollution type of design, the core pollution of storing in the chemical agent storage tank is delivered in the rock core fastener (2) with chemical agent, and so that the tested core (1) that is sandwiched in the rock core fastener (2) is in pollutional condition;
Step 4, water drive experiment and the corresponding waterflood permeability that records after tested core (1) pollutes, for analogue experiment method the tested core (1) that is in pollutional condition in the step 3 is carried out water drive for simulated experiment according to the described water drive of step 203, and calculate waterflood permeability after tested core (1) pollutes according to measured data in the experimentation;
Step 5, ultrasonic wave assistant chemical reagent de-plugging experiment, its experimentation is as follows:
501, parameter adjustment: the running parameter to supersonic generator (13) adjusts accordingly and the running parameter after adjusting is done with record, and by adjusting the running parameter of supersonic generator (13), tackle mutually ultrasonic transducer (12) produce hyperacoustic frequency and amplitude is adjusted;
502, equipment prerun: open supersonic generator (13) and ultrasonic transducer (12) and carry out prerun, and the prerun time is 10min～30min;
503, with chemical agent the tested core (1) that is in pollutional condition is being carried out the chemical plugging removal experiment by the chemical plugging removal of transporting to from the chemical agent storage tank in the rock core fastener (2) under the supersonic oscillations condition; And carry out chemical plugging removal when experiment, can realize when carrying out supersonic oscillations, carrying out chemical plugging removal, carry out chemical plugging removal first and carry out again supersonic oscillations and carry out first supersonic oscillations and carry out again three kinds of chemical plugging removal simulated experiments of chemical plugging removal;
When the need simulation is carried out chemical plugging removal when carrying out supersonic oscillations, then after described supersonic generator (13) and the end of ultrasonic transducer (12) prerun, close oil passage control valve and open waterway controlling valve, chemical agent pipage control valve and supersonic generator (13) and ultrasonic transducer (12), realization is carried out chemical plugging removal experiment with chemical agent to the tested core (1) that is in pollutional condition by the chemical plugging removal of transporting to from the chemical agent storage tank in the rock core fastener (2) under supersonic oscillations and chemical agent de-plugging double condition;
When need simulations is carried out first chemical plugging removal when carrying out the supersonic oscillations experiment again, then after supersonic generator (13) and the end of ultrasonic transducer (12) prerun, close first oil passage control valve, waterway controlling valve and supersonic generator (13) and ultrasonic transducer (12) and open chemical agent pipage control valve, with chemical agent the tested core (1) that is in pollutional condition is carried out the chemical plugging removal experiment by the chemical plugging removal of transporting to from the chemical agent storage tank in the rock core fastener (2); When chemical plugging removal experimental period to be set finishes, close again oil passage control valve, waterway controlling valve and chemical agent pipage control valve and open supersonic generator (13) and ultrasonic transducer (12), the tested core (1) after the chemical plugging removal experiment is carried out supersonic oscillations;
When need simulations is carried out first supersonic oscillations when carrying out chemical plugging removal again, then after supersonic generator (13) and the end of ultrasonic transducer (12) prerun, close first oil passage control valve, waterway controlling valve and chemical agent pipage control valve and open supersonic generator (13) and ultrasonic transducer (12), the tested core (1) that is in pollutional condition is carried out the supersonic oscillations experiment; When supersonic oscillations experimental period to be set finishes, close again oil passage control valve, waterway controlling valve and supersonic generator (13) and ultrasonic transducer (12) and open chemical agent pipage control valve, test carrying out chemical plugging removal through supersonic oscillations and the tested core (1) that is in pollutional condition with chemical agent by the chemical plugging removal of transporting to from the chemical agent storage tank rock core fastener (2) in;
Carry out in the step 5 in the ultrasonic wave assistant chemical reagent de-plugging experimentation, ring presses feedway (4) to be in all the time opening;
The experiment of step 6, water drive and the corresponding waterflood permeability that records behind tested core (1) chemical plugging removal: according to the described water drive of step 203 for analogue experiment method, tested core (1) after the de-plugging of ultrasonic wave assistant chemical reagent in the step 5 is carried out water drive for simulated experiment, and calculate waterflood permeability behind tested core (1) chemical plugging removal according to measured data in the experimentation;
Step 7, change tested core (1), and repeating step one carries out dynamic simulation experiment to a plurality of tested cores (1) that are replaced respectively to step 6; Repeatedly in the dynamic simulation experiment, ultrasonic transducer described in the step 5 (12) hyperacoustic frequency that produces all not identical with amplitude, then carry out each time ultrasonic wave assistant chemical reagent de-plugging when experiment, in step 501, all need to ultrasonic transducer (12) produce hyperacoustic frequency and amplitude is adjusted;
Step 8, data preparation: the waterflood permeability in the waterflood permeability after the tested core (1) that calculates in the initial waterflood permeability of the tested core (1) that calculates in the step 2, the step 4 polluted and the step 6 behind tested core (1) chemical plugging removal compares; Simultaneously, in the step 7 under different frequency and various amplitude supersonic oscillations condition the waterflood permeability of tested core (1) compare, and comparing result is carried out synchronous recording.
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