CN102564900B - Simulation test method for seepage process of polymer solution at different positions of stratum - Google Patents
Simulation test method for seepage process of polymer solution at different positions of stratum Download PDFInfo
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Abstract
The invention relates to a simulation test method for a seepage process of a polymer solution at different positions of a stratum. The method comprises the following steps of: preparing a sand filling tube model which accords with oil reservoir reality according to an oil reservoir mineral compositions, testing a porosity and a permeability parameter of a sand filling tube, and strictly simulating an oil reservoir corresponding parameter; selecting an injection flow value of a polymer system according to a researched stratum position; then performing a closed cyclic experimental test for simulating the original pressure and the temperature condition of the stratum, and simulating the seepage process of the polymer solution in the stratum; and closing, isolating oxygen, fetching a sample, testing the rheology of the sample, and comparing to calculate the change rule of the rheology. According to the simulation test method, the seepage process of the polymer system at different positions in the stratum can be reflected really; and a test and evaluation method is supplied to research on the rheology of the polymer solution during seepage at different positions and different seepage distances in the stratum.
Description
One, technical field:
What the present invention relates to is indoor test and the evaluation method of polymer solution rheological Changing Pattern in oil reservoir in the tertiary oil recovery process, and what be specifically related to is that polymer solution is at diverse location place, stratum flow event analog detection method.
Two, background technology:
The polymer solution technology of reservoir sweep is the present both at home and abroad method of more ripe raising recovery ratio in oilfield exploitation, but polymer solution seepage flow in stratum, to the rheological Changeement at diverse location place neither one effective method also, causes the credibility that the polymkeric substance development effectiveness is estimated to lack strong foundation.The rheological characteristics of polymer solution in porous medium is the key areas in polymer rheology, it is related to polymer solution flows and occurs in porous medium physical process, the analysis of exact science is carried out in the research work in this field to polymer flooding, to engineering design, and process optimization etc. has urgent Practical significance.Do not see delivering of domestic and international pertinent literature always, the blank of the research content becomes the technical bottleneck of restriction rheological property of polymer solution rule Changeement in stratum filtration, further limited in oil-field development polymeric system has been gone to resultful evaluation, therefore set up simulating polymer solution seepage flow in stratum significant to the method for diverse location place rheological Changeement.
Three, summary of the invention:
The purpose of this invention is to provide polymer solution at diverse location place, stratum flow event analog detection method, it lacks the indoor test of polymkeric substance flow event rheological Changing Pattern in oil reservoir and the problem of evaluation for solving present oilfield development process.
The technical solution adopted for the present invention to solve the technical problems is: this polymer solution is at diverse location place, stratum flow event analog detection method, at first according to oil reservoir mineral composition preparation, meet the sand-filling tube model of oil reservoir reality, two kinds of fill out sand tube size design: Φ 25.4 * 400mm or Φ 60 * 200mm, back-up sand casing pack mineral composition is identical with simulated formation, make the actual seepage flow Minerals in lab simulation and stratum identical on the Properties of Copolymer Solution impact, test fill out sand tube porosity and permeability parameter, in strict conformity with the corresponding parameter of simulating oil deposit; Injection flow according to the position of stratum selective polymerization objects system of studying; Then carry out the sealing and circulating experiment test of simulated formation virgin pressure, temperature conditions, simulating polymer solution is flow event in stratum, the sand-filling tube model for preparing is put into to the experimental simulation environment, connect enclosed oxygen isolation circulation injected system, connect injected system and extraction device, start injected system, open tensimeter, open the high temperature constant temperature control box, simulation stratum condition, injection parameter is set, by the enclosed oxygen isolation circulation injected system Seepage Experiment that circulates, the flow event of simulating polymer solution in stratum; Enclosed oxygen isolation accesses sample, specimen rheological, comparing calculation rheological Changing Pattern.
In such scheme, preparation meets the method for the sand-filling tube model of oil reservoir reality:
(1) according to the experimental simulation task of explanation, choose and prepare metal pattern, as test the flowing distance and can choose Φ 25.4 * 400mm model with the rheological property of polymer solution variation relation, as the modeling effort percolation flow velocity, the rheological property of polymer solution Changing Pattern is chosen to Φ 60 * 200mm metal pattern;
(2) natural core of the stratum of simulation being obtained is analyzed, and obtains formation pore structural parameters and mineral composition ratio;
(3) according to experimental simulation stratum mineral composition ratio, choose the Minerals And Rocks base material, then according to particle diameter, distribute and carry out the selection of particle diameter ratio, according to mineral composition and particle diameter ratio, evenly mix filling mineral, as without bonding mineral such as clays, added the bonding mineral of suitable amount of adhesive;
(4) to model filling mineral intermixture, base area layer original pressure environment, determine compaction pressure, uses electronic compacting machine spreads compaction model;
(5) thermostatic curing 48 hours under the reservoir temperature condition;
(6) under the reservoir temperature condition, by gas, survey the model permeability and determine whether model has similar permeability character to simulated formation; By saturated stratum simulation salt solution and water, survey the model permeability, again determine the similarity of model with the simulation stratum.
Simulating polymer solution flow event in stratum in such scheme:
(1) in indoor enclosed oxygen isolation circulation injected system, by system pressure and temperature, control, realize the similarity of experimental situation with the simulation oil reservoir;
(2) open injected system, according to calculated flow rate injection of polymer solution, carry out the seepage simulation circulation, according to the simulated formation distance, determine cycle index;
(3) by the plunger type to the extraction device, preserve filling nitrogen in container, realize the isolation of polymer solution with oxygen; By the strict airtight connection of whole enclosed oxygen isolation circulation injected system, realize the enclosed oxygen isolation of injected system, avoid the solution ingress of air, realize the sealing and circulating process of the test;
(4) in the outlet of enclosed oxygen isolation circulation injected system, by plunger type, preserve the container oxygen barrier and preserve the outlet sample;
(5) Quick Measurement rheological property of polymer solution in test macro, study its rheological Changing Pattern;
(6) pass through formula
Calculate shear rate corresponding to different percolation flow velocities, by the impact of the different the flowing distances of indoor rheological test result comparative analysis on rheological property of polymer solution.
In such scheme, enclosed oxygen isolation circulation injected system comprises plunger type intermediate receptacle, intermediate receptacle, sand-filling tube model, four-way valve, tensimeter, pump, by the injection line, the second plunger type intermediate receptacle that between the first plunger type intermediate receptacle, the first plunger type intermediate receptacle and the first intermediate receptacle, inject between line, sand-filling tube model, the second intermediate receptacle, the second intermediate receptacle and the second plunger type intermediate receptacle, forms the polymkeric substance infusion circuit; By the extraction line between extraction line, sand-filling tube model, the second intermediate receptacle, the second intermediate receptacle and the first plunger type intermediate receptacle, the first plunger type intermediate receptacle between the second plunger type intermediate receptacle, the second plunger type intermediate receptacle and the first intermediate receptacle, form polymer produced loop; Pump is connected with lower chamber and the second plunger type intermediate receptacle lower chamber of the first plunger type intermediate receptacle respectively by the first four-way valve; A tensimeter respectively is installed before and after sand-filling tube model.
The first plunger type intermediate receptacle in such scheme and the second plunger type intermediate receptacle equal and opposite in direction; The first intermediate receptacle and the second intermediate receptacle equal and opposite in direction.
In such scheme, the top of the first plunger type intermediate receptacle is equipped with the second four-way valve; The first intermediate receptacle bottom is equipped with the 3rd four-way valve; The top of the second intermediate receptacle is installed the bottom of the 4th four-way valve, the second intermediate receptacle the 5th four-way valve is installed; The top of the second plunger type intermediate receptacle is equipped with the 6th four-way valve; The lower chamber of the lower chamber of the first plunger type intermediate receptacle and the second plunger type intermediate receptacle is respectively installed a bleed valve, and the bottom of the second intermediate receptacle also is equipped with bleed valve.
Beneficial effect:
Rheological Changeement method in the flow event of polymer solution provided by the invention under diverse location place, stratum and different the flowing distance condition, principle is reliable, sand-filling tube model making and proving installation are simple in structure, can reflect more truly that polymeric acceptor ties up to the flow event of stratum diverse location, and reduction subsurface pressure condition and temperature conditions are tested it and are led the polymeric system rheological and change, analogy method is practical, and test findings adaptability is good.The present invention provides test and evaluation method for rheological Changeement in the flow event of polymer solution under diverse location place, stratum and different the flowing distance.
2, the present invention has simulated the sealing and circulating injected system of polymer solution seepage flow in stratum.
3, the present invention has set up the mineral composition for preparing simulated formation and the method for pore structure characteristic.
Four, accompanying drawing explanation:
Fig. 1 is process flow diagram of the present invention;
Fig. 2 is that in the present invention, the polymer solution seepage simulation circulating system is arranged block diagram;
Fig. 3 is the structural representation of enclosed oxygen isolation circulation injected system in the present invention;
Fig. 4 is the structural representation of extraction device in the present invention;
Fig. 5 is that fluid is at diverse location place percolation flow velocity Discrepancy Description schematic diagram;
Fig. 6-Fig. 8 is back-up sand way of contact difference schematic diagram in sand-filling tube model;
Fig. 9 is rheological Changeement method middle distance simulation key diagram in the polymer solution seepage process.
1 pump 2 first plunger type intermediate receptacle 2 ' the second plunger type intermediate receptacle 3 first intermediate receptacle 3 ' the second intermediate receptacle 4 sand-filling tube models 5 inject line 6 extraction line 7 first four-way valve 8 second four-way valve 9 the 3rd four-way valve 10 the 4th four-way valve 11 the 5th four-way valve 12 bleed valve 13 tensimeters 14 the 6th four-way valve 15 plunger types and preserve container entrance 16 distilled water outlet 17 high temperature constant temperature control box 18 blower fan 19 injected system 20 enclosed oxygen isolation circulation injected system 21 extraction device 22 proving installations.
Five, embodiment:
The present invention is described further below in conjunction with accompanying drawing:
The technical problem to be solved in the present invention is mainly concentrated two aspects:
(1) prepare the initial condition of the Different Strata of simulating polymer seepage flow, the pressure environment of depositing in underground tax
And temperature environment, the test polymer rheology of solution changes.
The stratum initial condition of simulating polymer seepage flow: be 1. that the filling mineral composition is identical with simulated formation, make the actual seepage flow Minerals in lab simulation and stratum identical on the Properties of Copolymer Solution impact; 2. model filling research stratum particle diameter distributes and the contact cement mode, test model factor of porosity, pore texture and seepage flow rate parameter are close with the research stratum, the shearing stress that is subject in assurance polymkeric substance flow event has the contrast property with actual formation, as Fig. 6, Fig. 7, shown in Figure 8.
(2) simulating polymer solution in stratum different seepage flow position with simulating polymer solution flow event under different the flowing distances in stratum.
In conjunction with Fig. 1, Fig. 2, shown in Figure 5, in order to solve above-mentioned two problems, the technical solution used in the present invention is specially:
At first according to study a question needs and stratum physical condition, determine that fill out sand tube prepares scheme, select quartz sand particle size distribution and ratio, mineral to form and the filling mode, prepare fill out sand tube, test fill out sand tube porosity and permeability parameter, in strict conformity with the corresponding parameter of simulating oil deposit;
According to the position of stratum of research, (comprising: low speed vadose region at the bottom of injection-production well, between well pattern main stream line middle part and well) the injection flow of selective polymerization objects system;
Then carry out the sealing and circulating experiment test of the conditions such as simulated formation virgin pressure, temperature, the sand-filling tube model 4 for preparing is put into to the experimental simulation environment, connect enclosed oxygen isolation circulation injected system 20, connect injected system 19 and extraction device, start injected system 19, open tensimeter, open the temperature controller device, simulation stratum condition, injection parameter is set, carries out Seepage Experiment, the outlet enclosed oxygen isolation accesses sample, the specimen rheological, comparing calculation rheological Changing Pattern.
Be specially:
At first preparation meets the percolation model of simulated formation reservoir rocks pore texture and mineral composition, and its method for making is as follows:
If only study shear stress impact in seepage flow on rheological property of polymer solution, only need to determine that in fill out sand tube, quartz sand particle size distributes; If research absorption, on the rheological property of polymer solution impact, needs to load normal 2 meters fill out sand tube.
(1) according to the experimental simulation task of explanation, choose and prepare metal pattern, as test the flowing distance and can choose Φ 25.4 * 400mm model with the rheological property of polymer solution variation relation, as the modeling effort percolation flow velocity, the rheological property of polymer solution Changing Pattern is chosen to Φ 60 * 200mm metal pattern.
(2) natural core of the stratum of simulation being obtained is analyzed, and obtains formation pore structural parameters and mineral composition ratio.
(3) according to experimental simulation stratum mineral composition ratio, choose the Minerals And Rocks base material, then according to particle diameter, distribute and carry out the selection of particle diameter ratio, according to mineral composition and particle diameter ratio, evenly mix filling mineral, as without bonding mineral such as clays, added the bonding mineral of suitable amount of adhesive.
(4) to model filling mineral intermixture, base area layer original pressure environment, determine compaction pressure, uses electronic compacting machine spreads compaction model.
(5) thermostatic curing 48 hours under the reservoir temperature condition.
(6) under the reservoir temperature condition, by gas, survey the model permeability and determine whether model has similar permeability character to simulated formation; By saturated stratum simulation salt solution and water, survey the model permeability, again determine the similarity of model with the simulation stratum.
Then according to the actual injection of polymer solution speed of oil reservoir and upper pressure limit calculative determination simulating lab test processed, inject flow and pressure limit:
(2) according to actual formation overburden pressure and stratum virgin pressure, determine the upper pressure limit of injection of polymer solution.
Finally start the experiment of lab simulation polymer solution seepage, Study Polymer Melts solution increases the Changing Pattern of system rheological with the flowing distance:
(1) in indoor simulated system, by system pressure and temperature, control, realize the similarity of experimental situation with the simulation oil reservoir.
(2) open injected system, according to calculated flow rate injection of polymer solution, carry out the seepage simulation circulation, as shown in Figure 9, according to the simulated formation distance, determine cycle index, for example: simulating polymer solution seepage flow is to apart from 100 meters, shaft bottom rheological, changing, as long 2 meters of analogy model, cycle index is 50 times, 50 * 2 meters=100 meters.
(3) by the plunger type to the extraction device, preserve filling nitrogen in container,, realize the isolation of polymer solution with oxygen; By the strict airtight connection of whole injected system, realize the enclosed oxygen isolation of injected system, avoid the solution ingress of air, realize the sealing and circulating process of the test.
(4) in the outlet of enclosed oxygen isolation circulation injected system, by plunger type, preserve the container oxygen barrier and preserve the outlet sample.
(5) Quick Measurement rheological property of polymer solution in test macro 22, study its rheological Changing Pattern.
(6) pass through formula
Calculate shear rate corresponding to different percolation flow velocities, by the impact of the different the flowing distances of indoor rheological test result comparative analysis on rheological property of polymer solution.
As shown in Figure 2, polymer solution seepage simulation circulating system in the present invention, mainly by: temperature control system, pressure detecting system, enclosed oxygen isolation circulation injected system 20, extraction device 21, injected system 19, polymer solution preparation and test system form.
Sand-filling tube model 4, enclosed oxygen isolation circulation injected system 20, pressure detecting system, sampling system critical piece are heat resisting and pressure resisting corrosion-resistant stainless steel rigid body, and be easy to loading and unloading, and it is simple that enclosed oxygen isolation circulation injected system opens and closes flow process.
Enclosed oxygen isolation circulation injected system mainly comprises: import ISCO high precision micro pump, this pump can be realized double plunger circulation injection continuously, inject precision and can reach 0.01ml/min, according to design discharge, set and inject flow, by compressor, provide 4 atmospheric air pressure, open in real time the pneumatic valve switch, inject continuously, this pump carries high-precision pressure monitoring device, and injection pressure and the injection rate IR of energy Real-Time Monitoring pump.
The temperature control system main device is high temperature constant temperature control box 17, the controllable temperature scope: the 0-250 degree, in case, carry two-way blower fan 18, and guarantee that the temperature inside the box is uniformly distributed.
Pressure monitor system comprises the injection pump pressure monitoring, injection side, production end and by the precision pressure gauge of the uniform different ranges of length,
Test system comprises: electronic balance, import flow graph, digital control stirrer, water bath with thermostatic control, robot calculator, air compressor etc.
By above-mentioned each system coordination work, can simulate and compose axle pressure, confined pressure and the temperature environment of depositing, test its flow conductivity.
As shown in Figure 4, in the present invention, the extraction device is mainly that plunger type is preserved container, and plunger type is preserved container entrance 15 in upper end, and distilled water outlet 16 is in lower end.
As shown in Figure 3, the enclosed oxygen isolation circulation injected system that the Seepage Experiment that circulates in the present invention uses comprises plunger type intermediate receptacle, intermediate receptacle, sand-filling tube model 4, four-way valve, tensimeter, an ISOC pump 1, by injection line 5 between the first plunger type intermediate receptacle 2, the first plunger type intermediate receptacle 2 and the first intermediate receptacle 3, sand-filling tube model 4, the second intermediate receptacle 3 ', the second intermediate receptacle 3 ' and the second plunger type intermediate receptacle 2 ' between injection line 5, the second plunger type intermediate receptacle 2 ' form polymkeric substance infusion circuit; By the second plunger type intermediate receptacle 2 ', the second plunger type intermediate receptacle 2 ' and the first intermediate receptacle 3 between extraction line 6, sand-filling tube model 4, the second intermediate receptacle 3 ', the second intermediate receptacle 3 ' and the first plunger type intermediate receptacle 2 between extraction line 6, the first plunger type intermediate receptacle 2 form polymer produced loop; Pump 1 is connected with lower chamber and the second plunger type intermediate receptacle 2 ' lower chamber of the first plunger type intermediate receptacle 2 respectively by the first four-way valve 7; A tensimeter 13 is respectively installed in sand-filling tube model 4 front and back.The first plunger type intermediate receptacle 2 and second plunger type intermediate receptacle 2 ' equal and opposite in direction; The first intermediate receptacle 3 and second intermediate receptacle 3 ' equal and opposite in direction, and both are common intermediate receptacle.
The top of the first plunger type intermediate receptacle 2 of enclosed oxygen isolation circulation injected system is equipped with the second four-way valve 8; The first intermediate receptacle 3 bottoms are equipped with the 3rd four-way valve 9; The second intermediate receptacle 3 ' top install the 4th four-way valve 10, the second intermediate receptacle 3 ' bottom the 5th four-way valve 11 is installed; The second plunger type intermediate receptacle 2 ' top the 6th four-way valve 14 is installed; The lower chamber of the first plunger type intermediate receptacle 2 and the second plunger type intermediate receptacle 2 ' lower chamber respectively install a bleed valve 12, the second intermediate receptacles 3 ' bottom bleed valve also is installed.
In the present invention, to carry out circulation experiment process implementation step as follows for enclosed oxygen isolation circulation injected system:
Step 1: at first clean and dry each plunger type intermediate receptacle chamber, each intermediate receptacle chamber in experimentation, annotate nitrogen and replace the air in above-mentioned each intermediate receptacle, then polymer solution is loaded into to the first intermediate receptacle 3 chambers and the first plunger type intermediate receptacle 2 upper chamber; According to simulated formation position calculation injection rate;
step 2: open ISCO pump 1, start experiment, open the first four-way valve 7, make distilled water in ISCO pump 1 enter the first plunger type intermediate receptacle 2 bottom chamber, under the injection pressure effect in the first plunger type intermediate receptacle 2 plunger from container bottom displacement top polymer solution, the first plunger type intermediate receptacle 2 bottom drain valve are closed at this moment, make polymer solution pass through second four-way valve 8 on the first plunger type intermediate receptacle 2 tops, between the first plunger type intermediate receptacle and the first intermediate receptacle, inject line 5, the 3rd four-way valve 9 by the first intermediate receptacle 3 bottoms enters in the first intermediate receptacle 3 again, polymkeric substance infusion circuit operation this moment, polymer solution injects sand-filling tube model, and polymer produced loop is closed.
Step 3: after sand-filling tube model 4 seepage flow, polymer solution through the 5th four-way valve 11 outlet of second intermediate receptacle 3 ' bottom flow into the second intermediate receptacles 3 ' in; This moment, the bleed valve of second intermediate receptacle 3 ' bottom cut out, (while needing collected specimens to measure, this bleed valve is opened); Polymer solution flows out from the 4th four-way valve 10 at second intermediate receptacle 3 ' top, through the injection line 5 between the second intermediate receptacle 3 and the second plunger type intermediate receptacle, by the 6th four-way valve 14, flow into second plunger type intermediate receptacle 2 ' upper chamber, under the polymer solution effect, in second plunger type intermediate receptacle 2 ' bottom chamber, distilled water is discharged through bleed valve 12; And polymer produced loop is still closed.
Process step 2 and step 3 have realized injection and the airtight collection of polymer solution, for circulation, inject and get ready; Below enter circulation step as follows:
Step 4: after in injection side the first plunger type intermediate receptacle 2 top chamber that ISCO pump 1 connects, polymkeric substance injects end, close the first four-way valve 7 valves on pipeline between the lower chamber of pump 1 and the first plunger type intermediate receptacle 2, open simultaneously the first four-way valve 7 valves on pipeline between pump 1 and second plunger type intermediate receptacle 2 ' lower chamber; ISCO pump 1 injects distilled water and flows into second plunger type intermediate receptacle 2 ' bottom chamber; The outlet polymer solution that second plunger type intermediate receptacle 2 ' top chamber the is collected injection that starts to circulate, polymer produced loop operation this moment, the polymkeric substance infusion circuit is closed, polymer solution extraction line 6 between the second plunger type intermediate receptacle and the first intermediate receptacle flows into the first intermediate receptacle 3, and then injection sand-filling tube model 4 circulates; Inject sand-filling tube model 4 outlet polymer solutions through the 5th four-way valve 11 outlets of second intermediate receptacle 3 ' bottom flow into the second intermediate receptacles 3 ', from the 4th four-way valve 10 at second intermediate receptacle 3 ' top, flow out again, extraction line 6 between the second intermediate receptacle and the first plunger type intermediate receptacle, flow into the first plunger type intermediate receptacle 2 top chamber, start to collect the outlet polymer solution, for circulation next time is prepared.
Step 5: after in second plunger type intermediate receptacle 2 ' top chamber, polymkeric substance injects and finishes, open the polymkeric substance infusion circuit, close simultaneously polymer produced loop, start circulation again and inject.
Through above-mentioned steps 2,3,4 and 5, realize the circulation injection of polymer solution, according to experimental simulation the flowing distance and sand-filling tube model length, determined cycle index.
Claims (4)
1. a polymer solution is at diverse location place, stratum flow event analog detection method, it is characterized in that: this polymer solution is at diverse location place, stratum flow event analog detection method, at first according to oil reservoir mineral composition preparation, meet the sand-filling tube model (4) of oil reservoir reality, two kinds of fill out sand tube size design: Φ 25.4 * 400mm or Φ 60 * 200mm, back-up sand casing pack mineral composition is identical with simulated formation, make the actual seepage flow Minerals in lab simulation and stratum identical on the Properties of Copolymer Solution impact, test fill out sand tube porosity and permeability parameter, in strict conformity with the corresponding parameter of simulating oil deposit, injection flow according to the position of stratum selective polymerization objects system of studying, then carry out the simulated formation virgin pressure, the sealing and circulating experiment test of temperature conditions, simulating polymer solution is flow event in stratum, the sand-filling tube model for preparing is put into to the experimental simulation environment, connect enclosed oxygen isolation circulation injected system, connect injected system (19) and extraction device (21), start injected system (19), open tensimeter, open high temperature constant temperature control box (17), simulation stratum condition, injection parameter is set, by enclosed oxygen isolation circulation injected system (20) Seepage Experiment that circulates, the flow event of simulating polymer solution in stratum, enclosed oxygen isolation accesses sample, specimen rheological, comparing calculation rheological Changing Pattern,
The sealing and circulating experiment test process of carrying out simulated formation virgin pressure, temperature conditions is:
(1) in indoor enclosed oxygen isolation circulation injected system, by system pressure and temperature, control, realize the similarity of experimental situation with the simulation oil reservoir;
(2) open injected system, according to calculated flow rate injection of polymer solution, carry out the seepage simulation circulation, according to the simulated formation distance, determine cycle index;
(3) by the plunger type to the extraction device, preserve filling nitrogen in container, realize the isolation of polymer solution with oxygen; By the strict airtight connection of whole enclosed oxygen isolation circulation injected system, realize the enclosed oxygen isolation of injected system, avoid the solution ingress of air, realize the sealing and circulating process of the test;
(4) in the outlet of enclosed oxygen isolation circulation injected system, by plunger type, preserve the container oxygen barrier and preserve the outlet sample;
(5) Quick Measurement rheological property of polymer solution in test macro, study its rheological Changing Pattern;
(6) pass through formula
Calculate shear rate corresponding to different percolation flow velocities, logical
Cross the impact of the different the flowing distances of indoor rheological test result comparative analysis on rheological property of polymer solution;
Enclosed oxygen isolation circulation injected system comprises plunger type intermediate receptacle, intermediate receptacle, sand-filling tube model (4), four-way valve, tensimeter, pump (1), by the injection line (5), the second plunger type intermediate receptacle (2 ') that between the first plunger type intermediate receptacle (2), the first plunger type intermediate receptacle and the first intermediate receptacle, inject between line (5), sand-filling tube model (4), the second intermediate receptacle (3 '), the second intermediate receptacle and the second plunger type intermediate receptacle, forms the polymkeric substance infusion circuit; By the extraction line (6) between extraction line (6), sand-filling tube model (4), the second intermediate receptacle (3 '), the second intermediate receptacle and the first plunger type intermediate receptacle, the first plunger type intermediate receptacle (2) between the second plunger type intermediate receptacle (2 '), the second plunger type intermediate receptacle and the first intermediate receptacle, form polymer produced loop; Pump (1) is connected with lower chamber and second plunger type intermediate receptacle (2 ') lower chamber of the first plunger type intermediate receptacle (2) respectively by the first four-way valve (7); A tensimeter (13) respectively is installed before and after sand-filling tube model (4).
2. polymer solution according to claim 1 is at diverse location place, stratum flow event analog detection method, and it is characterized in that: described preparation meets the method for the sand-filling tube model of oil reservoir reality:
(1) according to the experimental simulation task of explanation, choose and prepare metal pattern, the test the flowing distance is with the rheological property of polymer solution variation relation, choose Φ 25.4 * 400mm model, the modeling effort percolation flow velocity is chosen Φ 60 * 200mm metal pattern to the rheological property of polymer solution Changing Pattern;
(2) natural core of the stratum of simulation being obtained is analyzed, and obtains formation pore structural parameters and mineral composition ratio;
(3) according to experimental simulation stratum mineral composition ratio, choose the Minerals And Rocks base material, then according to particle diameter, distribute and carry out the selection of particle diameter ratio, according to mineral composition and particle diameter ratio, evenly mix filling mineral, without bonding mineral, add the bonding mineral of suitable amount of adhesive;
(4) to model filling mineral intermixture, base area layer original pressure environment, determine compaction pressure, uses electronic compacting machine spreads compaction model;
(5) thermostatic curing 48 hours under the reservoir temperature condition;
(6) under the reservoir temperature condition, by gas, survey the model permeability and determine whether model has similar permeability character to simulated formation; By saturated stratum simulation salt solution and water, survey the model permeability, again determine the similarity of model with the simulation stratum.
3. polymer solution according to claim 1, at diverse location place, stratum flow event analog detection method, is characterized in that: described the first plunger type intermediate receptacle (2) and the second plunger type intermediate receptacle (2 ') equal and opposite in direction; The first intermediate receptacle (3) and the second intermediate receptacle (3 ') equal and opposite in direction.
4. polymer solution according to claim 3, at diverse location place, stratum flow event analog detection method, is characterized in that: the top of described the first plunger type intermediate receptacle (2) is equipped with the second four-way valve (8); The first intermediate receptacle (3) bottom is equipped with the 3rd four-way valve (9); The top of the second intermediate receptacle (3 ') is installed the bottom of the 4th four-way valve (10), the second intermediate receptacle (3 ') the 5th four-way valve (11) is installed; The top of the second plunger type intermediate receptacle (2 ') is equipped with the 6th four-way valve (14); The lower chamber of the lower chamber of the first plunger type intermediate receptacle (2) and the second plunger type intermediate receptacle (2 ') is respectively installed a bleed valve (12), and (3 ') bottom of the second intermediate receptacle also is equipped with bleed valve.
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| CN102183438A (en) * | 2011-03-02 | 2011-09-14 | 中国海洋石油总公司 | Method for simulating shearing of polymer solution under oil reservoir condition and special equipment of method |
| CN102221514A (en) * | 2010-12-13 | 2011-10-19 | 中国石油化工股份有限公司 | Joint testing device and method of rheological property of polymer solution and relative permeability of core |
| CN202421016U (en) * | 2012-01-18 | 2012-09-05 | 东北石油大学 | Experimental device for simulating seepage process of polymer solution in stratum |
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| CN102221514A (en) * | 2010-12-13 | 2011-10-19 | 中国石油化工股份有限公司 | Joint testing device and method of rheological property of polymer solution and relative permeability of core |
| CN102183438A (en) * | 2011-03-02 | 2011-09-14 | 中国海洋石油总公司 | Method for simulating shearing of polymer solution under oil reservoir condition and special equipment of method |
| CN202421016U (en) * | 2012-01-18 | 2012-09-05 | 东北石油大学 | Experimental device for simulating seepage process of polymer solution in stratum |
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| Title |
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| 《疏水缔合聚合物在孔隙介质中的渗流阻力模拟分析》;程仲等;《特种油气藏》;20100831;第17卷(第4期);91-93页 * |
| 程仲等.《疏水缔合聚合物在孔隙介质中的渗流阻力模拟分析》.《特种油气藏》.2010,第17卷(第4期), |
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