CN104076124B - Low-frequency resonant ripple assists gel sealing characteristics evaluation experimental device and method - Google Patents
Low-frequency resonant ripple assists gel sealing characteristics evaluation experimental device and method Download PDFInfo
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Abstract
The present invention relates to a kind of low-frequency resonant ripple and assist gel sealing characteristics evaluation experimental device and method.Low-frequency resonant ripple assists gel sealing characteristics evaluation experimental device to comprise: low-frequency resonant ripple testing table, for generation of low-frequency resonant; Core barrel, is arranged on low-frequency resonant ripple testing table, and core barrel comprises import, outlet and ring pressure mouth; Liquid container, is connected with outlet; Ring pressure supply unit, presses mouth to be connected with ring; Device also comprises displacement pump, water delivery intermediate receptacle, oil transportation intermediate receptacle and defeated gel intermediate receptacle, water delivery intermediate receptacle, oil transportation intermediate receptacle and defeated gel intermediate receptacle are arranged in parallel, and displacement delivery side of pump is connected with the import of core barrel with defeated gel intermediate receptacle by water delivery intermediate receptacle, oil transportation intermediate receptacle.The present invention has higher research and apply and is worth, and the development and apply for low-frequency resonant ripple compound displacement, profile control technique has established good research direction, contributes to the production status improving mid-late oilfield development, improves oil-field flooding efficiency.
Description
Technical field
The present invention relates to petro-technology field, particularly relate to a kind of low-frequency resonant ripple and assist gel sealing characteristics evaluation experimental device and method.
Background technology
It is the oil recovery technique improving oil secondary and tertiary recovery rate that low-frequency resonant ripple recovers the oil with chemistry flooding.Low-frequency resonant ripple recovers the oil and utilizes the propagation of sound physical properties field, makes oil reservoir and fluid produce physical and chemical changes, thus improves oil reservoir seepage flow condition, reach oil-water well increasing yield and injection object; Chemistry flooding technology utilizes injects chemicals to reach shutoff subsurface reservoir fluid-channeling channel and to improve sequent water flooding development degree in Injection Well.Less owing to improving recovery ratio amplitude when high-power resonant wave oil recovery technique is applied separately, but active area is large, and the percolation flow velocity of fluid in porous medium can be increased; It is high that chemistry flooding technology improves recovery ratio, but face medicine loss in injection process, fluid inject frictional resistance high, inject and the problem such as the transfer drive degree of depth is limited; In order to improve the effective utilization ratio of medicine and effective transfer drive distance in gel profile control technology gel injection process, two technology can be carried out Application of composite.But substantially still rest on the guess understanding stage about application validity during two technology Application of composite, assist gel profile control shutoff to improve in the theoretical research of recovery ratio effect and field test etc. about low-frequency resonant ripple and all there is shortcoming, especially lack high precision and there is the simulation laboratory test condition of high stability, device and effective test method thereof.
Summary of the invention
The object of this invention is to provide a kind of structure simple, install and lay convenient, reliable working performance and good, the widely applicable gel sealing characteristics evaluation experimental device of simulate effect and method.
For solving the problems of the technologies described above, as first aspect of the present invention, providing a kind of low-frequency resonant ripple and assisting gel sealing characteristics evaluation experimental device, comprising: low-frequency resonant ripple testing table, for generation of low-frequency resonant; Core barrel, is arranged on low-frequency resonant ripple testing table, and core barrel comprises import, outlet and ring pressure mouth; Liquid container, is connected with outlet; Ring pressure supply unit, presses mouth to be connected with ring; Device also comprises displacement pump, water delivery intermediate receptacle, oil transportation intermediate receptacle and defeated gel intermediate receptacle, water delivery intermediate receptacle, oil transportation intermediate receptacle and defeated gel intermediate receptacle are arranged in parallel, and displacement delivery side of pump is connected with the import of core barrel with defeated gel intermediate receptacle by water delivery intermediate receptacle, oil transportation intermediate receptacle.
Further, device also comprises operation valve, and displacement delivery side of pump is connected respectively by the entrance of an operation valve with water delivery intermediate receptacle, oil transportation intermediate receptacle and defeated gel intermediate receptacle.
Further, device also comprises multiport valve, after the shared multiport valve of outlet of the outlet of the outlet of water delivery intermediate receptacle, the outlet of oil transportation intermediate receptacle, defeated gel intermediate receptacle and ring pressure supply unit, is connected with core barrel.
Further, device also comprises check valve, and the outlet of core barrel is connected with liquid container by check valve, and the outlet of ring pressure supply unit is connected with check valve.
As second aspect of the present invention, provide a kind of gel sealing characteristics evaluation test method, provide above-mentioned device, the method comprises: step 10, will load the core saturation simulation local water of core barrel; Step 20, is heated to core need the environment temperature of simulated formation and be incubated; Step 30, according to the weight difference of core barrel before and after saturation simulation local water, calculates volume of voids and the factor of porosity of core barrel; Step 40, the pressure exported by ring pressure supply unit comes simulating oil deposit pressure condition and oil well production pressure condition; Step 50, carry out oily driven water-replacing dynamic analog test or water displacing oil dynamic analog test or gel inject shutoff test or gel shutoff after water displacing oil dynamic analog test.
Further, also comprised before step 10: step 1, control low-frequency resonant ripple testing table prerun first schedule time, then close low-frequency resonant ripple testing table.
Further, oily driven water-replacing dynamic analog test comprises: step 61, disconnects water delivery intermediate receptacle and the pipeline between defeated gel intermediate receptacle and core barrel; Step 62, utilizes displacement pump that the oil in oil transportation intermediate receptacle is delivered into core barrel; Step 63, the oil pressure of displacing the water yield and oil transportation intermediate receptacle in Continuous Observation liquid container; Step 64, when oil pressure keep stable and displace the water yield constant time, then terminate oily driven water-replacing dynamic analog test.
Further, water displacing oil dynamic analog test comprises: step 71, disconnects oil transportation intermediate receptacle and the pipeline between defeated gel intermediate receptacle and core barrel; Step 72, utilizes displacement pump that the water in water delivery intermediate receptacle is delivered into core barrel; Step 73, divide multiple time point record correlation parameter, correlation parameter comprises: writing time and/or displace the water yield and/or displace oil mass and/or water consumption and/or core barrel inlet water pressure value, wherein, displacing oil mass is oil mass in liquid container, displacing the water yield is the water yield in liquid container, and water consumption is the water yield that water delivery intermediate receptacle consumes; Step 74, when displacement stops test to during the volume of voids of the first prearranged multiple, and disconnects the pipeline between water delivery intermediate receptacle and core barrel.
Further, gel injection shutoff test comprises: step 81, disconnects water delivery intermediate receptacle and the pipeline between oil transportation intermediate receptacle and core barrel; Step 82, utilizes displacement pump that the gel in defeated gel intermediate receptacle is delivered into core barrel; Step 83, divide multiple time point record correlation parameter, correlation parameter comprises: writing time and/or displace the water yield and/or displace oil mass and/or gel injection rate IR and/or core barrel inlet water pressure value, wherein, displacing oil mass is oil mass in liquid container, displacing the water yield is the water yield in liquid container, and gel injection rate IR is the gel content that defeated gel intermediate receptacle consumes; Step 84, stops test when gel injection rate IR reaches the volume of voids of the second prearranged multiple, and disconnects the pipeline between defeated gel intermediate receptacle and core barrel; Step 85, waits for that second schedule time is to make gel plastic.
Further, the water displacing oil dynamic analog test after gel shutoff comprises: perform step 81 to 84, injects shutoff test to complete gel; Step 91, disconnects oil transportation intermediate receptacle and the pipeline between defeated gel intermediate receptacle and core barrel; Step 92, utilizes displacement pump that the water in water delivery intermediate receptacle is delivered into core barrel; Step 93, divide multiple time point record correlation parameter, correlation parameter comprises: writing time and/or displace the water yield and/or displace oil mass and/or water consumption and/or core barrel inlet water pressure value, wherein, displacing oil mass is oil mass in liquid container, displacing the water yield is the water yield in liquid container, and water consumption is the water yield that water delivery intermediate receptacle consumes; Step 94, when displacement stops test to during the volume of voids of the first prearranged multiple, and disconnects the pipeline between water delivery intermediate receptacle and core barrel.
The present invention utilizes low-frequency resonant fluctuation worktable to load on oil reservoir core by the low-frequency resonant ripple of different low-frequency vibration factor, run under the condition making low-frequency resonant ripple assist the evaluation test of gel sealing characteristics to fluctuate at low-frequency resonant, time of each test of record simultaneously and corresponding with the time displace oil mass, the water yield and force value; Finally carry out data processing, the gel shutoff efficiency after low frequency resonance wave assists core perviousness change before and after gel shutoff, oil recovery factor change and low-frequency resonant ripple to assist gel shutoff under single-phase or heterogeneous fluid can be drawn, multiple low-frequency vibration factor assists gel sealing characteristics affecting laws to low-frequency resonant ripple.Of the present invention applied widely, there is higher research and apply be worth, development and apply for low-frequency resonant ripple compound displacement, profile control technique has established good research direction, contributes to the production status improving mid-late oilfield development, improves oil-field flooding efficiency.
Accompanying drawing explanation
Fig. 1 low-frequency resonant ripple diagrammatically illustrated in the present invention assists the structural representation of gel sealing characteristics evaluation experimental device;
Fig. 2 diagrammatically illustrates the process flow diagram of test method of the present invention.
Reference numeral in figure: 1, low-frequency resonant ripple testing table; 2, core barrel; 3, liquid container; 4, ring pressure supply unit; 5, displacement pump; 6, water delivery intermediate receptacle; 7, oil transportation intermediate receptacle; 8, defeated gel intermediate receptacle; 9, operation valve; 10, multiport valve; 11, check valve; 12, liquid reserve tank; 13, pressure detection and display unit; 14, back pressure supply operation valve; 15, ring pressure supply operation valve.
Embodiment
Below embodiments of the invention are described in detail, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
The invention belongs to the indoor strengthening displacement of reservoir oil increasing yield and injection that recovers the oil and improve recovery ratio dynamic physical modelling technique field, especially relate to a kind of low-frequency resonant ripple and assist gel sealing characteristics evaluation experimental device and test method.
As a first aspect of the present invention, provide a kind of low-frequency resonant ripple and assist gel sealing characteristics evaluation experimental device, comprising: low-frequency resonant ripple testing table 1, for generation of low-frequency resonant; Core barrel 2, is arranged on low-frequency resonant ripple testing table 1, and for testing the performance of core before and after gel shutoff be arranged in core barrel, core barrel 2 comprises import, outlet and ring pressure mouth; Liquid container 3, be connected with outlet, preferably, it is marked with the scale measured its inside institute storing solution volume, and liquid container quantity is identical with core barrel quantity, can measure the fluid flow in corresponding core barrel respectively; Ring pressure supply unit 4, presses mouth to be connected with ring, and for applying circumferential pressure to the core of core barrel inside, preferably, ring pressure supply unit 4 is wobble pump; Device also comprises displacement pump 5, water delivery intermediate receptacle 6, oil transportation intermediate receptacle 7 and defeated gel intermediate receptacle 8, water delivery intermediate receptacle 6, oil transportation intermediate receptacle 7 and defeated gel intermediate receptacle 8 are arranged in parallel, and the outlet of displacement pump 5 is connected with the import of core barrel 2 with defeated gel intermediate receptacle 8 by water delivery intermediate receptacle 6, oil transportation intermediate receptacle 7.Preferably, displacement pump 5 is constant flow pump, particularly HLB-1040 type constant flow pump.
Preferably, water delivery intermediate receptacle 6 is equipped with post oil recovery factory, Yanchang Oilfield Gangu simulated formation water; Preferably, oil transportation intermediate receptacle 7 built with kerosene, particularly aviation kerosene.Preferably, this device also comprises the constant temperature oven be laid in outside core barrel.Preferably, this device also comprises the liquid reserve tank 12 connected with the entrance of displacement pump.
Preferably, low-frequency resonant ripple testing table 1 comprise drive core barrel synchronously carry out level or extensional vibration shaking table, to be laid in below shaking table and to promote shaking table and carry out the low frequency electromagnetic vibrating device of level or extensional vibration and to connect with low frequency electromagnetic vibrating device and to the driving frequency of low frequency electromagnetic vibrating device with drive acceleration to carry out the vibration controller controlling to adjust.Wherein, low frequency electromagnetic vibrating device connects with vibration controller, and preferably, the driving frequency of low frequency electromagnetic vibrating device is 0 to 100Hz, and core barrel is fixing on a vibration table; Preferably, the gel be equipped with in defeated gel intermediate receptacle 8 is the new chromium gel of configuration.Liquid in the liquid reserve tank 12 be connected with displacement pump is aviation kerosene.Preferably, the bracing frame supported is provided with immediately below shaking table.
In one preferably embodiment, core barrel is the fill out sand tube of matrix rock core sand, and described fill out sand tube quantity is two.During actual tests, can adjust accordingly as one or more the quantity of the fill out sand tube being fixed on low-frequency resonant ripple testing table 1 according to specific needs.Correspondingly, what each core barrel was corresponding is provided with a liquid container.
When the unlatching of in two fill out sand tube, another closedown, under can investigating low-frequency resonant ripple condition, different vibration factor is on the impact of gel plugging effect in one dimension homogeneous reservoir; When two fill out sand tube are opened simultaneously, the pressure of the check valve of two core barrel connections is identical, and under can investigating low-frequency resonant ripple condition, different vibration factor is on the impact of gel plugging effect in heterogeneous reservoir.Wherein, low-frequency vibration factor is time of vibration, vibration frequency, vibration acceleration, Oscillation Amplitude, vibration opportunity, mode of vibration; Vibration opportunity in described low-frequency vibration factor is carry out resonance wave the different gel gelation time stage to assist the evaluation test of gel sealing characteristics; Mode of vibration in described low-frequency vibration factor is that shaking table continuous shaking or shaking table intermittence are opened vibration and closed.
In one embodiment, when oil transportation intermediate receptacle and water delivery intermediate receptacle use all in test, to investigate the gel plugging effect under two-phase fluid; If when only using oil transportation intermediate receptacle 7 in test or only use water delivery intermediate receptacle 6, then the gel plugging effect under monophasic fluid can be investigated.
Preferably, water delivery intermediate receptacle 6, oil transportation intermediate receptacle 7 and defeated gel intermediate receptacle 8 are separately installed with the pressure detection for detecting the fluid pressure that it is carried in real time and display unit 13.
Preferably, device also comprises operation valve 9, and the outlet of displacement pump 5 is connected respectively by the entrance of an operation valve with water delivery intermediate receptacle 6, oil transportation intermediate receptacle 7 and defeated gel intermediate receptacle 8.These operation valves 9 are respectively used to control the liquid that the displacement of displacement pump goes out and whether enter corresponding water delivery intermediate receptacle 6, oil transportation intermediate receptacle 7 or defeated gel intermediate receptacle 8.
Preferably, device also comprises multiport valve 10, after the shared multiport valve 10 of outlet of the outlet of the outlet of water delivery intermediate receptacle 6, the outlet of oil transportation intermediate receptacle 7, defeated gel intermediate receptacle 8 and ring pressure supply unit 4, is connected with core barrel 2.
Preferably, device also comprises check valve 11, and the outlet of core barrel 2 is connected with liquid container 3 by check valve 11, and the outlet of ring pressure supply unit 4 is connected with check valve 11.Preferably, the pipeline between ring pressure supply unit 4 and check valve 11 is provided with back pressure and supplies operation valve 14.Preferably, the pipeline between ring pressure supply unit 4 and core barrel is provided with ring press and supply operation valve 15.
As a second aspect of the present invention, please refer to Fig. 2, provide a kind of gel sealing characteristics evaluation test method, provide above-mentioned device, the method comprises:
Step 10, will load the core saturation simulation local water of core barrel 2;
Step 20, is heated to core need the environment temperature of simulated formation and be incubated;
Step 30, according to the weight difference of core barrel 2 before and after saturation simulation local water, calculates volume of voids and the factor of porosity of core barrel.Such as, before carrying out tested core pre-service, first measure the dry weight of tested core, and tested core is vacuumized with saturation simulation local water after again the weight in wet base of tested core is weighed, and calculate volume of voids and the factor of porosity of tested core according to weighing result.
Step 40, the pressure exported by ring pressure supply unit 4 comes simulating oil deposit pressure condition and oil well production pressure condition.This step can be referred to as parameter tuning step, specifically, can according to reservoir pressure and the oil well production pressure condition needing simulated formation, by carrying out control adjustment to ring pressure feedway, the circumferential pressure making ring press feedway to be carried on tested core is identical with needing the reservoir pressure of simulated formation, and in process of the test, retaining ring pressure is constant.When the pressure of fill out sand tube liquid outlet is 0, disassemble check valve, external pipe is logical air directly; When the pressure of fill out sand tube liquid outlet is not 0, by carrying out control adjustment to check valve pressure, makes check valve be carried in the pressure of tested core endpiece identical with needing the production pressure of simulation oil well, in process of the test, keeping back pressure constant.
Step 50, carry out oily driven water-replacing dynamic analog test or water displacing oil dynamic analog test or gel inject shutoff test or gel shutoff after water displacing oil dynamic analog test.
Preferably, also comprised before step 10: step 1, control low-frequency resonant ripple testing table 1 prerun first schedule time, then close low-frequency resonant ripple testing table 1.Like this, when performing step 1, form the evaluation test of low-frequency resonant ripple gel sealing characteristics; And when not performing step 1, then form the evaluation test of non-low-frequency resonant ripple gel sealing characteristics.Preferably, open described low-frequency resonant ripple testing table 1 by vibration controller and carry out prerun, preferably, prerun time is 20min ~ 40min, and prerun terminates rear closedown low-frequency resonant ripple testing table 1.In one embodiment, described electromagnetic oscillation device prerun 30min is opened.
Wherein, step 10-30 formation carries out pretreated step to tested core.Specifically, can conveniently permeability to oil method of testing, by the core saturation simulation local water in loading two fill out sand tube; Then, again according to the ambient temperature conditions needing simulated formation, be heated to together with the tested core of its inside the environment temperature needing simulated formation by heating arrangement two fill out sand tube, to be heatedly after needing the environment temperature of simulated formation, two fill out sand tube to be fixed on the shaking table of low-frequency resonant ripple testing table 1, and it is outside described thermostat to be laid in described fill out sand tube.
Preferably, oily driven water-replacing dynamic analog test comprises: step 61, disconnects water delivery intermediate receptacle 6 and the pipeline between defeated gel intermediate receptacle 8 and core barrel; Step 62, utilizes displacement pump 5 that the oil in oil transportation intermediate receptacle 7 is delivered into core barrel 2; Step 63, the oil pressure of displacing the water yield and oil transportation intermediate receptacle 7 in Continuous Observation liquid container 3; Step 64, when oil pressure keep stable and displace the water yield constant time, then terminate oily driven water-replacing dynamic analog test.
Specifically, oil driven water-replacing dynamic analog test process is as follows: start ring pressure supply unit, start check valve, close the operation valve in water route, close the operation valve on gel road, open the operation valve of oil circuit, start displacement pump, carry out oily driven water-replacing dynamic analog test by the kerosene transported to from oil transportation intermediate receptacle in fill out sand tube to tested core.And in oily driven water-replacing process, Continuous Observation is carried out to the water yield of displacing in described oil pressure detection and real-time the detected oil pressure of display unit and described liquid container, when described oil pressure detect and display unit institute detect oil pressure numerical value keep stablizing and in described liquid container displace the water yield constant time, then oily driven water-replacing dynamic analog test terminates, and is now in abundant saturated oil state in tested core and the correspondence establishment irreducible water of tested core.
Preferably, water displacing oil dynamic analog test comprises: step 71, disconnects oil transportation intermediate receptacle 7 and the pipeline between defeated gel intermediate receptacle 8 and core barrel; Step 72, utilizes displacement pump 5 that the water in water delivery intermediate receptacle 6 is delivered into core barrel 2; Step 73, divide multiple time point record correlation parameter, correlation parameter comprises: writing time and/or displace the water yield and/or displace oil mass and/or water consumption and/or core barrel inlet water pressure value, wherein, displacing oil mass is oil mass in liquid container, displacing the water yield is the water yield in liquid container, and water consumption is the water yield that water delivery intermediate receptacle 6 consumes; Step 74, when displacement stops test to during the volume of voids of the first prearranged multiple, and disconnects the pipeline between water delivery intermediate receptacle 6 and core barrel 2.
Specifically, in water displacing oil dynamic analog test: by closing oil passage control valve, closing gel road operation valve, open waterway controlling valve, starting displacement pump, realize by from water delivery intermediate receptacle, the simulated formation water transported in fill out sand tube carries out water displacing oil dynamic analog test to tested core, and in water displacing oil dynamic analog test process, multiple time point is divided to carry out record respectively to the correlation parameter in water displacing oil dynamic analog test process, described correlation parameter comprises the writing time corresponding with each time point, displace the water yield, displace oil mass, water consumption, fill out sand tube inlet water pressure value, displace oil mass be tested out by the scale on liquid container displace to the kerosene quantity in described liquid container by tested core, described displace the water yield be tested out by the scale on described liquid container displace to the simulated formation water number amount in described liquid container by tested core, the simulated formation water number amount of described water consumption for consuming in water delivery intermediate receptacle, fill out sand tube inlet water pressure value used is for described water delivery intermediate receptacle and connect the hydraulic pressure value that six-way valve place hydraulic pressure detects and display unit detects.Preferably, when doing water displacing oil dynamic analog test under the condition not adding the vibration of low-frequency resonant ripple, displacement is to 20 times of volume of voids; Then disposable closedown waterway controlling valve.Preferably, when doing water displacing oil dynamic analog test under the condition of low-frequency resonant ripple vibration, displacement is to 20 times of volume of voids; Then disposable closedown waterway controlling valve.
Preferably, gel injects shutoff test and comprises: step 81, disconnects water delivery intermediate receptacle 6 and the pipeline between oil transportation intermediate receptacle 7 and core barrel; Step 82, utilizes displacement pump 5 that the gel in defeated gel intermediate receptacle 8 is delivered into core barrel 2; Step 83, divide multiple time point record correlation parameter, correlation parameter comprises: writing time and/or displace the water yield and/or displace oil mass and/or gel injection rate IR and/or core barrel inlet water pressure value, wherein, displacing oil mass is oil mass in liquid container, displacing the water yield is the water yield in liquid container, and gel injection rate IR is the gel content that defeated gel intermediate receptacle 8 consumes; Step 84, stops test when gel injection rate IR reaches the volume of voids of the second prearranged multiple, and disconnects the pipeline between defeated gel intermediate receptacle 8 and core barrel 2; Step 85, waits for that second schedule time is to make gel plastic.
Specifically, inject shutoff at the gel of non-low-frequency resonant ripple vibration to test: by closing waterway controlling valve, closing oil passage control valve, open gel road operation valve, starting displacement pump, realize, by the gel transported to from defeated gel intermediate receptacle in described fill out sand tube, gel injection shutoff is carried out to the core crossed by water displacing oil and test; And in gel injection process, multiple time point is divided to carry out record respectively to the correlation parameter that gel injects shutoff process of the test, described correlation parameter comprises the writing time corresponding with each time point, displaces the water yield, displaces oil mass, gel injection rate IR, fill out sand tube inlet water pressure value, the simulation number of gels of described gel injection rate IR for consuming in defeated gel intermediate receptacle, injection rate IR is 0.05 times ~ 0.6 times volume of voids; After gel injects, close displacement pump, close gel road operation valve, the gel carried out in fill out sand tube is waited solidifying, and curing time is the gelation time of gel.Preferably, in the present embodiment, under the condition not adding the vibration of low-frequency resonant ripple, inject gel 0.2 times of volume of voids, after gel injects, close displacement pump and gel road operation valve, wait solidifying 40h.
Inject shutoff at the gel of low-frequency resonant ripple vibration to test: by closing waterway controlling valve, closing oil passage control valve, open gel road operation valve, starting displacement pump, realize, by the gel transported to from defeated gel intermediate receptacle in described fill out sand tube, gel injection shutoff is carried out to the core crossed by water displacing oil and test, open vibration controller switch, the low-frequency vibration factor planned in the evaluation test of gel sealing characteristics is assisted according to the low-frequency resonant ripple that need test, adjust the time of vibration arranged in vibration controller, vibration opportunity, vibration frequency, vibration acceleration, mode of vibration, time of vibration in described vibration controller is the working time of low frequency electromagnetic vibrating device, vibration in described vibration controller is the different gel gelation time stage open low frequency electromagnetic vibrating device opportunity, the described different gel gelation time stage is any time from gel plastic induction period to plastic stationary phase, vibration frequency in described vibration controller is the driving frequency of electromagnetic oscillation device, vibration acceleration in described vibration controller is the driving acceleration of electromagnetic oscillation device, mode of vibration in vibration controller is that electromagnetic oscillation device continuous shaking or electromagnetic oscillation device intermittence are opened vibration and closed, in gel injection process, point multiple time point carries out record respectively to the correlation parameter that gel injects shutoff process of the test, and described correlation parameter comprises the writing time corresponding with each time point, displaces the water yield, displaces oil mass, gel injection rate IR, fill out sand tube inlet water pressure value, after gel injects, close displacement pump, close gel road operation valve, the gel carried out in fill out sand tube is waited solidifying, and it is identical that curing time and the gel that non-low-frequency resonant ripple vibrates inject the curing time that shutoff tests.Preferably, low-frequency resonant ripple testing table is opened while starting to inject gel, arranging vibration frequency is core sand natural frequency, vibration acceleration is 0.4m/s2, and time of vibration is that gel starts 12 hours after injecting, and under the condition of low-frequency resonant ripple vibration, injecting gel injection rate IR and the gel that non-low-frequency resonant ripple vibrates, to inject the gel injection rate IR that shutoff tests identical, it is 0.2 times of volume of voids, after gel injects, close displacement pump and gel road operation valve, wait solidifying 40h.
Preferably, the water displacing oil dynamic analog test after gel shutoff comprises: perform step 81 to 84, injects shutoff test to complete gel; Then perform following steps: step 91, disconnect oil transportation intermediate receptacle 7 and the pipeline between defeated gel intermediate receptacle 8 and core barrel; Step 92, utilizes displacement pump 5 that the water in water delivery intermediate receptacle 6 is delivered into core barrel 2; Step 93, divide multiple time point record correlation parameter, correlation parameter comprises: writing time and/or displace the water yield and/or displace oil mass and/or water consumption and/or core barrel inlet water pressure value, wherein, displacing oil mass is oil mass in liquid container, displacing the water yield is the water yield in liquid container, and water consumption is the water yield that water delivery intermediate receptacle 6 consumes; Step 94, when displacement stops test to during the volume of voids of the first prearranged multiple, and disconnects the pipeline between water delivery intermediate receptacle 6 and core barrel 2.
Preferably, this method also comprises: repeat above-mentioned steps, carry out low-frequency resonant ripple respectively and assist the evaluation test of gel sealing characteristics, and corresponding point of multiple time point carries out record respectively to the correlation parameter in process of the test to multiple tested core be replaced; Repeatedly low-frequency resonant ripple is assisted in the evaluation test of gel sealing characteristics, only changes a factor in low-frequency vibration factor, keeps other vibration factors constant; Change different vibration factor successively, measure and obtain different vibration factor assists gel sealing characteristics impact on low-frequency resonant ripple.
Preferably, this method also comprises data processing step: according to the conventional Calculation Method of oil recovery factor and drill core permeability rate, according to the test figure that water displacing oil dynamic simulation experiment after non-low-frequency resonant ripple water displacing oil dynamic simulation experiment and the shutoff of non-low-frequency resonant ripple gel records, the gel shutoff efficiency after core perviousness change before and after the shutoff of non-low-frequency resonant ripple gel, oil recovery factor change and the shutoff of non-low-frequency resonant ripple gel can be calculated.The test figure that after injecting shutoff experiment, gel shutoff according to low-frequency resonant ripple water displacing oil dynamic simulation experiment, low-frequency resonant ripple gel, water displacing oil dynamic simulation experiment records, can calculate low-frequency resonant ripple assist core perviousness change before and after gel shutoff, oil recovery factor change and low-frequency resonant ripple to assist gel shutoff after gel shutoff efficiency, water drive breakthrough pressure, multiple low-frequency vibration factor low-frequency resonant ripple is assisted to the affecting laws of gel sealing characteristics.
In the present embodiment, vibration assists the impact of gel sealing characteristics to the results are shown in Table 1 on low-frequency resonant ripple opportunity, water drive breakthrough pressure after gel shutoff efficiency under experiment investigation different vibration opportunity, shutoff, gel shutoff efficiency is the reduction amplitude of permeability before the relative shutoff of permeability after shutoff:
Table 1 vibrate opportunity gel sealing characteristics assisted on low-frequency resonant ripple affect statistical form
As can be seen from Table 1, carry out in injection process vibrating the sealing characteristics that can strengthen gel, and after injecting, plastic carries out the sealing characteristics that vibration can reduce gel; Under suitable low-frequency resonant wave parameter, it is feasible that low-frequency resonant ripple assists gel blocking technology to improve waterflood efficiency.
The present invention compared with prior art has the following advantages:
1, apparatus structure is simple, reasonable in design and install and lay convenient, and use easy to operate, input cost is low.
2, practical value is high, there is popularizing application prospect comparatively widely, the present invention carries out the apparatus and method of indoor gel sealing characteristics evaluation test under proposing a kind of condition loading low-frequency resonant ripple, specifically gel sealing characteristics evaluation test after being loaded with the core water displacing oil of carrying out under the low-frequency resonant ripple condition of different time of vibration, vibration frequency, vibration acceleration, vibration opportunity and mode of vibration, and expanded in the production status improvement and crude oil enhanced recovery being applied to mid-late oilfield development, improve oil-field flooding efficiency.
3, be further developing low-frequency resonant ripple intensified oil reduction technology and resonance wave Combined Mining oil tech, for low-frequency resonant ripple assists the reasonable application of gel profile control technology to provide solid theoretical foundation and shop experiment means, and for low-frequency resonant ripple compound displacement, profile control technique development and apply established good research direction.
4, the good and perfect in shape and function of result of use, in test, institute's test data is accurate, and can adapt to carry out indoor dynamic simulant test to the reservoir conditions such as single-phase or heterogeneous fluid, core perviousness and nonuniformity, crude oil property, reservoir temperature, sand pressure and the working condition such as core inlet pressure, core top hole pressure to the affecting laws of gel plugging effect after reservoir core water displacing oil.
5, stable work in work and widely applicable, this test simulation formation temperature: 25-120 DEG C, simulating oil deposit pressure: 5-25MPa, simulation low-frequency resonant ripple frequency: 0-100Hz, simulation low-frequency resonant wave pressure amplitude: 3-10MPa, this test simulation displacing medium is the multiple displacing mediums such as different salinity water, simulated formation water, simulated formation oil, surfactant solution, polymer solution, aqueous slkali simultaneously.
In sum, the present invention utilizes low-frequency resonant fluctuation worktable to load on oil reservoir core by the low-frequency resonant ripple of different low-frequency vibration factor, run under the condition making low-frequency resonant ripple assist the evaluation test of gel sealing characteristics to fluctuate at low-frequency resonant, time of each test of record simultaneously and corresponding with the time displace oil mass, the water yield and force value; Finally carry out data processing, the gel shutoff efficiency after low frequency resonance wave assists core perviousness change before and after gel shutoff, oil recovery factor change and low-frequency resonant ripple to assist gel shutoff under single-phase or heterogeneous fluid can be drawn, multiple low-frequency vibration factor assists gel sealing characteristics affecting laws to low-frequency resonant ripple.Of the present invention applied widely, there is higher research and apply be worth, development and apply for low-frequency resonant ripple compound displacement, profile control technique has established good research direction, contributes to the production status improving mid-late oilfield development, improves oil-field flooding efficiency.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. low-frequency resonant ripple assists a gel sealing characteristics evaluation experimental device, it is characterized in that, comprising:
Low-frequency resonant ripple testing table (1), for generation of low-frequency resonant;
Core barrel (2), is arranged on described low-frequency resonant ripple testing table (1), and described core barrel (2) comprises import, outlet and ring pressure mouth;
Liquid container (3), is connected with described outlet;
Ring pressure supply unit (4), presses mouth to be connected with described ring;
Described device also comprises displacement pump (5), water delivery intermediate receptacle (6), oil transportation intermediate receptacle (7) and defeated gel intermediate receptacle (8), described water delivery intermediate receptacle (6), oil transportation intermediate receptacle (7) and defeated gel intermediate receptacle (8) are arranged in parallel, and the outlet of described displacement pump (5) is connected with the import of described core barrel (2) with defeated gel intermediate receptacle (8) by described water delivery intermediate receptacle (6), oil transportation intermediate receptacle (7);
Operation valve (9), the outlet of described displacement pump (5) is connected respectively by the entrance of a described operation valve and described water delivery intermediate receptacle (6), oil transportation intermediate receptacle (7) and defeated gel intermediate receptacle (8);
Multiport valve (10), after the shared described multiport valve (10) of outlet of the outlet of the outlet of described water delivery intermediate receptacle (6), the outlet of oil transportation intermediate receptacle (7), defeated gel intermediate receptacle (8) and ring pressure supply unit (4), be connected with described core barrel (2);
Check valve (11), the outlet of described core barrel (2) is connected with described liquid container (3) by described check valve (11), and the outlet of described ring pressure supply unit (4) is connected with described check valve (11).
2. a gel sealing characteristics evaluation test method, provides device according to claim 1, it is characterized in that, described method comprises:
Step 10, will load the core saturation simulation local water of described core barrel (2);
Step 20, is heated to need the environment temperature of simulated formation and be incubated by described core;
Step 30, according to described core barrel (2) weight difference before and after saturation simulation local water, calculates volume of voids and the factor of porosity of described core barrel;
Step 40, the pressure exported by described ring pressure supply unit (4) comes simulating oil deposit pressure condition and oil well production pressure condition;
Step 50, carry out oily driven water-replacing dynamic analog test or water displacing oil dynamic analog test or gel inject shutoff test or gel shutoff after water displacing oil dynamic analog test.
3. method according to claim 2, is characterized in that, also comprises before described step 10:
Step 1, controls described low-frequency resonant ripple testing table (1) prerun first schedule time, then closes described low-frequency resonant ripple testing table (1).
4. method according to claim 2, is characterized in that, described oily driven water-replacing dynamic analog test comprises:
Step 61, disconnects described water delivery intermediate receptacle (6) and the pipeline between defeated gel intermediate receptacle (8) and described core barrel;
Step 62, utilizes described displacement pump (5) that the oil in described oil transportation intermediate receptacle (7) is delivered into described core barrel (2);
Step 63, the oil pressure of displacing the water yield and described oil transportation intermediate receptacle (7) in liquid container described in Continuous Observation (3);
Step 64, when described oil pressure keep stable and described in displace the water yield constant time, then terminate described oily driven water-replacing dynamic analog test.
5. method according to claim 2, is characterized in that, described water displacing oil dynamic analog test comprises:
Step 71, disconnects described oil transportation intermediate receptacle (7) and the pipeline between defeated gel intermediate receptacle (8) and described core barrel;
Step 72, utilizes described displacement pump (5) that the water in described water delivery intermediate receptacle (6) is delivered into described core barrel (2);
Step 73, divide multiple time point record correlation parameter, described correlation parameter comprises: writing time and/or displace the water yield and/or displace oil mass and/or water consumption and/or core barrel inlet water pressure value, wherein, described oil mass of displacing is oil mass in described liquid container, the described water yield of displacing is the water yield in described liquid container, and described water consumption is the water yield that described water delivery intermediate receptacle (6) consumes;
Step 74, when displacement stops test to during the described volume of voids of the first prearranged multiple, and disconnects the pipeline between water delivery intermediate receptacle (6) and described core barrel (2).
6. method according to claim 2, is characterized in that, described gel injects shutoff test and comprises:
Step 81, disconnects described water delivery intermediate receptacle (6) and the pipeline between oil transportation intermediate receptacle (7) and described core barrel;
Step 82, utilizes described displacement pump (5) that the gel in described defeated gel intermediate receptacle (8) is delivered into described core barrel (2);
Step 83, divide multiple time point record correlation parameter, described correlation parameter comprises: writing time and/or displace the water yield and/or displace oil mass and/or gel injection rate IR and/or core barrel inlet water pressure value, wherein, described oil mass of displacing is oil mass in described liquid container, the described water yield of displacing is the water yield in described liquid container, and described gel injection rate IR is the gel content that described defeated gel intermediate receptacle (8) consumes;
Step 84, stops test when gel injection rate IR reaches the described volume of voids of the second prearranged multiple, and disconnects the pipeline between described defeated gel intermediate receptacle (8) and described core barrel (2);
Step 85, waits for that second schedule time is to make gel plastic.
7. method according to claim 6, is characterized in that, the water displacing oil dynamic analog test after described gel shutoff comprises:
Perform described step 81 to 84, inject shutoff test to complete described gel;
Step 91, disconnects described oil transportation intermediate receptacle (7) and the pipeline between defeated gel intermediate receptacle (8) and described core barrel;
Step 92, utilizes described displacement pump (5) that the water in described water delivery intermediate receptacle (6) is delivered into described core barrel (2);
Step 93, divide multiple time point record correlation parameter, described correlation parameter comprises: writing time and/or displace the water yield and/or displace oil mass and/or water consumption and/or core barrel inlet water pressure value, wherein, described oil mass of displacing is oil mass in described liquid container, the described water yield of displacing is the water yield in described liquid container, and described water consumption is the water yield that described water delivery intermediate receptacle (6) consumes;
Step 94, when displacement stops test to during the described volume of voids of the first prearranged multiple, and disconnects the pipeline between water delivery intermediate receptacle (6) and described core barrel (2).
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| CN105064989A (en) * | 2015-08-12 | 2015-11-18 | 郑力会 | Method for observing stratum blocking form of working fluid in well |
| CN106501127B (en) * | 2016-10-17 | 2019-04-12 | 大港油田集团有限责任公司 | Profile control gel evaluation of dynamic method and device |
| CN108266166B (en) * | 2018-02-08 | 2020-07-31 | 中国石油大学(华东) | Experimental device and method for evaluating fluctuation oil recovery micro-jet permeability-increasing mechanism of fractured reservoir |
| CN110361296A (en) * | 2018-04-10 | 2019-10-22 | 中国石油天然气股份有限公司 | Device and method for determining gel forming performance of polymer gel system |
| CN109633098B (en) * | 2019-01-04 | 2024-02-27 | 中国石油大学(华东) | Device and method for evaluating entry capacity of microcrack plugging agent of well cementation cement sheath |
| CN113777028B (en) * | 2021-11-11 | 2022-01-18 | 成都理工大学 | Device and method for measuring adhesive strength between gel plugging material and rock wall surface |
| CN118190632B (en) * | 2024-05-15 | 2024-07-16 | 成都理工大学 | Gel performance testing device and method |
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