CN104076124A - Low-frequency resonance wave assisted gel plugging performance evaluation testing device and method - Google Patents
Low-frequency resonance wave assisted gel plugging performance evaluation testing device and method Download PDFInfo
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Abstract
The invention relates to a low-frequency resonance wave assisted gel plugging performance evaluation testing device and method. The low-frequency resonance wave assisted gel plugging performance evaluation testing device comprises a low-frequency resonance wave test bed for producing low-frequency resonance, a core barrel which is arranged on the low-frequency resonance wave test bed and comprises an inlet, an outlet and a ring pressure opening, a liquid container connected with the outlet, and a ring pressure supply part connected with the ring pressure opening; the device also comprises a displacement pump, a middle water delivery container, a middle oil delivery container and a middle gel delivery container, the middle water delivery container, the middle oil delivery container and the middle gel delivery container are connected with one another in parallel, and the outlet of the displacement pump is connected with the inlet of the core barrel by the middle water delivery container, the middle oil delivery container and the middle gel delivery container. The low-frequency resonance wave assisted gel plugging performance evaluation testing device has high research and application values, gives good research guidance for low-frequency resonance wave combined profile control and displacement and profile control technology development and application, and contributes to improving the later production condition in oil field development and improving the oil field flooding efficiency.
Description
Technical field
The present invention relates to petro-technology field, particularly relate to the auxiliary gel sealing characteristics evaluation experimental device of a kind of low-frequency resonant ripple and method.
Background technology
It is to improve the oil recovery technique of oil secondary and tertiary recovery rate that low-frequency resonant ripple recovers the oil with chemical transfer drive.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, thereby improves oil reservoir seepage flow condition, reaches oil-water well increasing yield and injection object; The utilization of chemistry transfer drive technology is injected chemicals and is reached shutoff subsurface reservoir fluid-channeling channel and improve follow-up water drive development degree in Injection Well.While application separately due to high-power resonant wave oil recovery technique, improve recovery ratio amplitude less, but active area is large, and can increases the percolation flow velocity of fluid in porous medium; It is high that chemistry transfer drive technology improves recovery ratio, but face that medicine loss in injection process, fluid inject that frictional resistance is high, injection 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 to Application of composite.But application validity during about two technology Application of composite still rests on the guess understanding stage substantially, all there is shortcoming in the aspect such as theoretical research and field test that auxiliary gel profile control shutoff improves recovery ratio effect about low-frequency resonant ripple, especially lacks high precision and have the simulation laboratory test condition, device of high stability and effective test method.
Summary of the invention
The object of this invention is to provide a kind of simple in structure, convenient, reliable working performance and good, widely applicable gel sealing characteristics evaluation experimental device and the method for simulate effect laid be installed.
For solving the problems of the technologies described above, as first aspect of the present invention, provide a kind of low-frequency resonant ripple to assist 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 mouthful; Liquid container, is connected with outlet; Ring is pressed 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 by water delivery intermediate receptacle, oil transportation intermediate receptacle and defeated gel intermediate receptacle.
Further, device also comprises operation valve, and displacement delivery side of pump is connected with the entrance of water delivery intermediate receptacle, oil transportation intermediate receptacle and defeated gel intermediate receptacle by an operation valve respectively.
Further, device also comprises multiport valve, and the outlet of the outlet of water delivery intermediate receptacle, the outlet of oil transportation intermediate receptacle, defeated gel intermediate receptacle and ring press the outlet of supply unit to share after a multiport valve, are 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 ring presses the outlet of supply unit to be connected with check valve.
As second aspect of the present invention, a kind of gel sealing characteristics evaluation test method is provided, above-mentioned device is provided, the method comprises: step 10, will pack the core saturation simulation local water of core barrel into; Step 20, is heated to core to need environment temperature the insulation of simulated formation; Step 30, the weight difference according to core barrel before and after saturation simulation local water, volume of voids and the factor of porosity of calculating core barrel; Step 40, presses the pressure of supply unit output to come simulating oil deposit pressure condition and oil well production pressure condition by ring; Step 50, carries out oily driven water-replacing dynamic analog test or water displacing oil dynamic analog test or gel and injects the water displacing oil dynamic analog test after shutoff test or gel shutoff.
Further, before step 10, also comprise: step 1, control low-frequency resonant ripple testing table first schedule time of prerun, then close low-frequency resonant ripple testing table.
Further, oily driven water-replacing dynamic analog test comprises: step 61, disconnects the pipeline between water delivery intermediate receptacle and 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 keeps stable and displaces the water yield when constant, finishes oily driven water-replacing dynamic analog test.
Further, water displacing oil dynamic analog test comprises: step 71, disconnects the pipeline between oil transportation intermediate receptacle and 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 points to 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 the 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 during to 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 the pipeline between water delivery intermediate receptacle and 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 points to 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 the 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, and disconnects the pipeline between defeated gel intermediate receptacle and core barrel in the time that gel injection rate IR reaches the volume of voids of the second prearranged multiple; Step 85, waits for that second schedule time is so that gel plastic.
Further, the water displacing oil dynamic analog test after gel shutoff comprises: execution step 81 to 84, inject shutoff test to complete gel; Step 91, disconnects the pipeline between oil transportation intermediate receptacle and 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 points to 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 the 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 during to 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 that the low-frequency resonant ripple of different low-frequency vibration factors is loaded on oil reservoir core, the auxiliary gel sealing characteristics evaluation test of low-frequency resonant ripple is moved under the condition of low-frequency resonant fluctuation, the time of the each test of record simultaneously and corresponding with time oil mass, the water yield and the force value of displacing; Finally carry out data processing, can show that under single-phase or heterogeneous fluid, before and after the auxiliary gel shutoff of low frequency resonance wave, core perviousness changes, oil recovery factor changes and low-frequency resonant ripple is assisted the gel shutoff efficiency after gel shutoff, the affect rule of multiple low-frequency vibration factor on the auxiliary gel sealing characteristics of low-frequency resonant ripple.Of the present invention applied widely, there is higher research and using value, establish good research direction for the development of low-frequency resonant ripple compound displacement, profile control technique with application, contributed to improve the production status of mid-late oilfield development, improved oil-field flooding efficiency.
Brief description of the drawings
Fig. 1 has schematically shown the structural representation of the auxiliary gel sealing characteristics evaluation experimental device of the low-frequency resonant ripple in the present invention;
Fig. 2 has schematically shown 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 is pressed 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 is supplied with operation valve; 15, ring is pressed and is supplied with operation valve.
Embodiment
Below embodiments of the invention are elaborated, 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 the auxiliary gel sealing characteristics evaluation experimental device of a kind of low-frequency resonant ripple and test method.
As a first aspect of the present invention, provide a kind of low-frequency resonant ripple to 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 the core being arranged in core barrel before and after gel shutoff, core barrel 2 comprises import, outlet and ring pressure mouthful; Liquid container 3, is connected with outlet, and preferably, it is marked with the scale that its inside institute storing solution volume is measured, and liquid container quantity is identical with core barrel quantity, can measure respectively the fluid flow in corresponding core barrel; Ring is pressed supply unit 4, presses mouth to be connected with ring, and for the core of core barrel inside is applied to circumferential pressure, preferably, it is wobble pump that ring is pressed supply unit 4; 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 by water delivery intermediate receptacle 6, oil transportation intermediate receptacle 7 and defeated gel intermediate receptacle 8.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, in oil transportation intermediate receptacle 7, kerosene is housed, particularly aviation kerosene.Preferably, this device also comprises the constant temperature oven that is laid in core barrel outside.Preferably, this device also comprises the liquid reserve tank 12 joining with the entrance of displacement pump.
Preferably, low-frequency resonant ripple testing table 1 comprises the shaking table that drives core barrel synchronously to carry out level or extensional vibration, is laid in shaking table below and promotes shaking table and carries out the low frequency electromagnetic vibrating device of level or extensional vibration and join with low frequency electromagnetic vibrating device and driving frequency to low frequency electromagnetic vibrating device and drive acceleration to control the vibration controller of adjustment.Wherein, low frequency electromagnetic vibrating device and vibration controller join, and preferably, the driving frequency of low frequency electromagnetic vibrating device is 0 to 100Hz, and core barrel is fixed on shaking table; Preferably, the gel being equipped with in defeated gel intermediate receptacle 8 is the new chromium gel of configuration.Liquid in the liquid reserve tank 12 being connected with displacement pump is aviation kerosene.Preferably, shaking table under be provided with the bracing frame supporting.
At one, preferably in embodiment, core barrel is the fill out sand tube of matrix rock core sand, and described fill out sand tube quantity is two.When actual tests, can adjust accordingly as one or more the quantity of the fill out sand tube that is fixed on low-frequency resonant ripple testing table 1 according to specific needs.What correspondingly, each core barrel was corresponding is provided with a liquid container.
When a unlatching in two fill out sand tube, another is while closing, can investigate under low-frequency resonant ripple condition the impact of different vibration factors on gel plugging effect in one dimension homogeneous reservoir; In the time that two fill out sand tube are opened simultaneously, the pressure of the check valve of two core barrel connections is identical, can investigate the impact of different vibration factors on gel plugging effect in heterogeneous reservoir under low-frequency resonant ripple condition.Wherein, low-frequency vibration factor is time of vibration, vibration frequency, vibration acceleration, Oscillation Amplitude, vibration opportunity, mode of vibration; Vibration in described low-frequency vibration factor is to carry out the auxiliary gel sealing characteristics evaluation test of resonance wave the different gel gelation time stages opportunity; Mode of vibration in described low-frequency vibration factor is that intermittent unlatching of shaking table continuous shaking or shaking table vibrated and close.
In one embodiment, when oil transportation intermediate receptacle and water delivery intermediate receptacle all use in test, to investigate the gel plugging effect under two-phase fluid; If when only using oil transportation intermediate receptacle 7 or only use water delivery intermediate receptacle 6 in test, can investigate the gel plugging effect under monophasic fluid.
Preferably, on water delivery intermediate receptacle 6, oil transportation intermediate receptacle 7 and defeated gel intermediate receptacle 8, be separately installed with pressure detection and the display unit 13 for detecting in real time its fluid pressure of carrying.
Preferably, device also comprises operation valve 9, and the outlet of displacement pump 5 is connected with the entrance of water delivery intermediate receptacle 6, oil transportation intermediate receptacle 7 and defeated gel intermediate receptacle 8 by an operation valve respectively.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, and 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 press the outlet of supply unit 4 to share after a multiport valve 10, are 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 ring presses the outlet of supply unit 4 to be connected with check valve 11.Preferably, on the pipeline between ring pressure supply unit 4 and check valve 11, back pressure is installed and supplies with operation valve 14.Preferably, ring is pressed on the pipeline between supply unit 4 and core barrel and is provided with and encircles pressure supply operation valve 15.
As a second aspect of the present invention, please refer to Fig. 2, a kind of gel sealing characteristics evaluation test method is provided, above-mentioned device is provided, the method comprises:
Step 10, will pack the core saturation simulation local water of core barrel 2 into;
Step 20, is heated to core to need environment temperature the insulation of simulated formation;
Step 30, the weight difference according to core barrel 2 before and after saturation simulation local water, volume of voids and the factor of porosity of calculating core barrel.For example, before carrying out tested core pre-service, first measure the dry weight of tested core, and by tested core vacuumize 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 of pressing supply unit 4 to export by ring comes simulating oil deposit pressure condition and oil well production pressure condition.This step can be referred to as parameter adjustment step, specifically, can be according to the reservoir pressure and the oil well production pressure condition that need simulated formation, by pressing feedway to control adjustment to ring, make ring press feedway be carried in circumferential pressure on tested core and need the reservoir pressure of simulated formation identical, in process of the test, retaining ring pressure is constant.In the time that the pressure of fill out sand tube liquid outlet is 0, disassemble check valve, external pipe is logical atmosphere directly; In the time that the pressure of fill out sand tube liquid outlet is not 0, by check valve pressure is controlled to adjustment, make pressure that check valve is carried in tested core endpiece and need the production pressure of simulation oil well identical, in process of the test, keep back pressure constant.
Step 50, carries out oily driven water-replacing dynamic analog test or water displacing oil dynamic analog test or gel and injects the water displacing oil dynamic analog test after shutoff test or gel shutoff.
Preferably, before step 10, also comprise: step 1, control low-frequency resonant ripple 1 first schedule time of prerun of testing table, then close low-frequency resonant ripple testing table 1.Like this, in the time performing step 1, form the evaluation test of low-frequency resonant ripple gel sealing characteristics; And in the time not performing step 1, form the evaluation test of non-low-frequency resonant ripple gel sealing characteristics.Preferably, can open described low-frequency resonant ripple testing table 1 by vibration controller and carry out prerun, preferably, the prerun time is 20min～40min, closes low-frequency resonant ripple testing table 1 after prerun finishes.In one embodiment, open described electromagnetic oscillation device prerun 30min.
Wherein, step 10-30 formation is carried out pretreated step to tested core.Specifically, can, into according to conventional permeability to oil method of testing, two core saturation simulation local waters in fill out sand tube will be packed; Then, again according to the ambient temperature conditions that needs simulated formation, be heated to need the environment temperature of simulated formation together with the tested core of its inside by two fill out sand tube of heating arrangement, to be heatedly after the environment temperature of simulated formation, two fill out sand tube are fixed on the shaking table of low-frequency resonant ripple testing table 1 to needing, and described thermostat is laid in to described fill out sand tube outside.
Preferably, oily driven water-replacing dynamic analog test comprises: step 61, disconnects the pipeline between water delivery intermediate receptacle 6 and 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 keeps stable and displaces the water yield when constant, finishes oily driven water-replacing dynamic analog test.
Specifically, oily driven water-replacing dynamic analog test process is as follows: start ring and press supply unit, start check valve, close the operation valve in water route, the operation valve of closing gel road, the operation valve of opening oil circuit, startup displacement pump, by the kerosene of transporting to from oil transportation intermediate receptacle in fill out sand tube, tested core is carried out to oily driven water-replacing dynamic analog test.And in oily driven water-replacing process, the water yield of displacing in described oil pressure detection and real-time the detected oil pressure of display unit and described liquid container is carried out to Continuous Observation, when described oil pressure detect and display unit detects that oil pressure numerical value keeps stablizing and described liquid container in displace the water yield when constant, oily driven water-replacing dynamic analog test finishes, now in tested core in abundant saturated oil state and correspondence establishment the irreducible water of tested core.
Preferably, water displacing oil dynamic analog test comprises: step 71, disconnects the pipeline between oil transportation intermediate receptacle 7 and 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 points to 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 the 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 during to 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, close gel road operation valve, open waterway controlling valve, starting displacement pump, realize, by the simulated formation water of transporting in fill out sand tube from water delivery intermediate receptacle, tested core is carried out to water displacing oil dynamic analog test, and in water displacing oil dynamic analog test process, divide multiple time points to carry out respectively record 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 and be being displaced to the kerosene quantity in described liquid container by tested core of testing out by the scale on liquid container, the described water yield of displacing is being displaced to the simulated formation water number amount in described liquid container by tested core of testing out by the scale on described liquid container, 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, do water displacing oil dynamic analog test under the condition that does not add the vibration of low-frequency resonant ripple time, till displacement to 20 times volume of voids; Then the disposable waterway controlling valve of closing.Preferably, do water displacing oil dynamic analog test under the condition of low-frequency resonant ripple vibration time, till displacement to 20 times volume of voids; Then the disposable waterway controlling valve of closing.
Preferably, gel injection shutoff test comprises: step 81, disconnects the pipeline between water delivery intermediate receptacle 6 and 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 points to 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 the 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, and disconnects the pipeline between defeated gel intermediate receptacle 8 and core barrel 2 in the time that gel injection rate IR reaches the volume of voids of the second prearranged multiple; Step 85, waits for that second schedule time is so that gel plastic.
Specifically, inject shutoff test at the gel of non-low-frequency resonant ripple vibration: by closing waterway controlling valve, close oil passage control valve, open gel road operation valve, starting displacement pump, realize by transport to gel in described fill out sand tube from defeated gel intermediate receptacle and the core of being crossed by water displacing oil is carried out to gel inject shutoff and test; And in gel injection process, the correlation parameter that divides multiple time points to inject shutoff process of the test to gel carries out respectively record, 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; Gel is closed displacement pump, is closed gel road operation valve after injecting, and the gel time of carrying out in fill out sand tube is coagulated, the gelation time that curing time is gel.Preferably, in the present embodiment, under the condition that does not add the vibration of low-frequency resonant ripple, inject 0.2 times of volume of voids of gel, gel is closed displacement pump and gel road operation valve after injecting, and waits solidifying 40h.
Inject shutoff test at the gel of low-frequency resonant ripple vibration: by closing waterway controlling valve, close oil passage control valve, open gel road operation valve, starting displacement pump, realize by transport to gel in described fill out sand tube from defeated gel intermediate receptacle and the core of being crossed by water displacing oil is carried out to gel inject shutoff and test, open vibration controller switch, according to the low-frequency vibration factor of planning in the auxiliary gel sealing characteristics evaluation test of the low-frequency resonant ripple of need test, adjustment arranges the time of vibration 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 stages to open low frequency electromagnetic vibrating devices opportunity, the described different gel gelation time stage is from gel plastic induction period to the plastic any time of 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 intermittent unlatching of electromagnetic oscillation device continuous shaking or electromagnetic oscillation device vibrated and close, in gel injection process, the correlation parameter that point multiple time points inject shutoff process of the test to gel carries out respectively record, 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, gel is closed displacement pump, is closed gel road operation valve after injecting, and the gel time of carrying out in fill out sand tube is coagulated, and curing time is identical with the curing time that the gel of non-low-frequency resonant ripple vibration injects shutoff test.Preferably, when starting to inject gel, open low-frequency resonant ripple testing table, it is core sand natural frequency that vibration frequency is set, vibration acceleration is 0.4m/s2, and time of vibration is that gel starts 12 hours after injection, injects gel injection rate IR identical with the gel injection rate IR that the gel of non-low-frequency resonant ripple vibration injects shutoff test under the condition of low-frequency resonant ripple vibration, it is 0.2 times of volume of voids, gel is closed displacement pump and gel road operation valve after injecting, and waits solidifying 40h.
Preferably, the water displacing oil dynamic analog test after gel shutoff comprises: execution step 81 to 84, inject shutoff test to complete gel; Then carry out following steps: step 91, disconnects the pipeline between oil transportation intermediate receptacle 7 and 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 points to 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 the 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 during to 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, respectively multiple tested cores that are replaced are carried out to the auxiliary gel sealing characteristics evaluation test of low-frequency resonant ripple, and corresponding point of multiple time points carry out respectively record to the correlation parameter in process of the test; Repeatedly, in the auxiliary gel sealing characteristics evaluation test of low-frequency resonant ripple, only change a factor in low-frequency vibration factor, keep other vibration factors constant; Change successively different vibration factors, measure the impact of different vibration factors on the auxiliary gel sealing characteristics of 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 after non-low-frequency resonant ripple water displacing oil dynamic simulation experiment and the shutoff of non-low-frequency resonant ripple gel, water displacing oil dynamic simulation experiment records, can calculate the gel shutoff efficiency after the core perviousness variation of non-low-frequency resonant ripple gel shutoff front and back, oil recovery factor variation and the shutoff of non-low-frequency resonant ripple gel.According to the test figure that after low-frequency resonant ripple water displacing oil dynamic simulation experiment, low-frequency resonant ripple gel injection shutoff experiment, gel shutoff, water displacing oil dynamic simulation experiment records, can calculate the auxiliary gel shutoff of low-frequency resonant ripple front and back core perviousness variation, oil recovery factor variation and low-frequency resonant ripple and assist gel shutoff efficiency, water drive breakthrough pressure, the affect rule of multiple low-frequency vibration factor on the auxiliary gel sealing characteristics of low-frequency resonant ripple after gel shutoff.
In the present embodiment, vibration the results are shown in Table 1 to the impact of the auxiliary gel sealing characteristics of low-frequency resonant ripple opportunity, water drive breakthrough pressure after gel shutoff efficiency under different vibration opportunity, shutoff has been investigated in test, and gel shutoff efficiency is the reduction amplitude of permeability before the relative shutoff of permeability after shutoff:
The statistical form that affects of gel sealing characteristics is assisted in table 1 vibration opportunity on low-frequency resonant ripple
As can be seen from Table 1, in injection process, vibrate the sealing characteristics that can strengthen gel, and after injecting, plastic is carried out vibration and can reduce the sealing characteristics of gel; Under suitable low-frequency resonant wave parameter, it is feasible that the auxiliary gel blocking technology of low-frequency resonant ripple improves 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 conveniently, uses easy to operately, and input cost is low.
2, practical value is high, there is popularizing application prospect comparatively widely, the present invention proposes a kind of apparatus and method of carrying out the evaluation test of indoor gel sealing characteristics under the condition of loading low-frequency resonant ripple, gel sealing characteristics evaluation test after the core water displacing oil of specifically carrying out under the low-frequency resonant ripple condition that is loaded with different time of vibration, vibration frequency, vibration acceleration, vibration opportunity and mode of vibration, and its expansion is applied in the production status improvement and crude oil enhanced recovery of 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 the reasonable application of the auxiliary gel profile control technology of low-frequency resonant ripple provides solid theoretical foundation and shop experiment means, and establish good research direction with application for the development of low-frequency resonant ripple compound displacement, profile control technique.
4, the good and perfect in shape and function of result of use, in test, institute's test data is accurate, and can adapt on the working conditions such as reservoir condition and core inlet pressure, core top hole pressure such as single-phase or heterogeneous fluid, core perviousness and nonuniformity, crude oil property, reservoir temperature, sand pressure on reservoir core water displacing oil after the rule that affects of gel plugging effect carry out indoor dynamic simulant test.
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 that the low-frequency resonant ripple of different low-frequency vibration factors is loaded on oil reservoir core, the auxiliary gel sealing characteristics evaluation test of low-frequency resonant ripple is moved under the condition of low-frequency resonant fluctuation, the time of the each test of record simultaneously and corresponding with time oil mass, the water yield and the force value of displacing; Finally carry out data processing, can show that under single-phase or heterogeneous fluid, before and after the auxiliary gel shutoff of low frequency resonance wave, core perviousness changes, oil recovery factor changes and low-frequency resonant ripple is assisted the gel shutoff efficiency after gel shutoff, the affect rule of multiple low-frequency vibration factor on the auxiliary gel sealing characteristics of low-frequency resonant ripple.Of the present invention applied widely, there is higher research and using value, establish good research direction for the development of low-frequency resonant ripple compound displacement, profile control technique with application, contributed to improve the production status of mid-late oilfield development, improved 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 of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. the auxiliary gel sealing characteristics evaluation experimental device of low-frequency resonant ripple, 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) upper, and described core barrel (2) comprises import, outlet and ring pressure mouthful;
Liquid container (3), is connected with described outlet;
Ring is pressed 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) by described water delivery intermediate receptacle (6), oil transportation intermediate receptacle (7) and defeated gel intermediate receptacle (8).
2. device according to claim 1, it is characterized in that, described device also comprises operation valve (9), and the outlet of described displacement pump (5) is connected with the entrance of described water delivery intermediate receptacle (6), oil transportation intermediate receptacle (7) and defeated gel intermediate receptacle (8) by a described operation valve respectively.
3. device according to claim 1, it is characterized in that, described device also comprises multiport valve (10), 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 press the outlet of supply unit (4) to share after a described multiport valve (10), are connected with described core barrel (2).
4. device according to claim 1, it is characterized in that, described device also comprises check valve (11), the outlet of described core barrel (2) is connected with described liquid container (3) by described check valve (11), and described ring presses the outlet of supply unit (4) to be connected with described check valve (11).
5. a gel sealing characteristics evaluation test method, provides the device described in any one in claim 1 to 4, it is characterized in that, described method comprises:
Step 10, will pack the core saturation simulation local water of described core barrel (2) into;
Step 20, is heated to described core to need environment temperature the insulation of simulated formation;
Step 30, the weight difference according to described core barrel (2) before and after the saturation simulation local water, calculates volume of voids and the factor of porosity of described core barrel;
Step 40, presses the pressure of supply unit (4) output to come simulating oil deposit pressure condition and oil well production pressure condition by described ring;
Step 50, carries out oily driven water-replacing dynamic analog test or water displacing oil dynamic analog test or gel and injects the water displacing oil dynamic analog test after shutoff test or gel shutoff.
6. method according to claim 5, is characterized in that, before described step 10, also comprises:
Step 1, controls described low-frequency resonant ripple testing table (1) first schedule time of prerun, then closes described low-frequency resonant ripple testing table (1).
7. method according to claim 5, is characterized in that, described oily driven water-replacing dynamic analog test comprises:
Step 61, disconnects the pipeline between described water delivery intermediate receptacle (6) and 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) described in Continuous Observation in liquid container (3);
Step 64, when described oil pressure keep stable and described in displace the water yield when constant, finish described oily driven water-replacing dynamic analog test.
8. method according to claim 5, is characterized in that, described water displacing oil dynamic analog test comprises:
Step 71, disconnects the pipeline between described oil transportation intermediate receptacle (7) and 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 points to 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, the described oil mass of displacing is the 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 during to 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).
9. method according to claim 5, is characterized in that, described gel injects shutoff test and comprises:
Step 81, disconnects the pipeline between described water delivery intermediate receptacle (6) and 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 points to 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, the described oil mass of displacing is the 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, and disconnects the pipeline between described defeated gel intermediate receptacle (8) and described core barrel (2) in the time that gel injection rate IR reaches the described volume of voids of the second prearranged multiple;
Step 85, waits for that second schedule time is so that gel plastic.
10. method according to claim 9, is characterized in that, the water displacing oil dynamic analog test after described gel shutoff comprises:
Carry out described step 81 to 84, inject shutoff test to complete described gel;
Step 91, disconnects the pipeline between described oil transportation intermediate receptacle (7) and 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 points to 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, the described oil mass of displacing is the 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 during to 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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