CN108590607A - The method and apparatus of chemical flooding effect after the poly- drive of comparison - Google Patents

Abstract

The method and apparatus of chemical flooding effect after the poly- drive of comparison.It is characterized in that：According to practical mining site situation to be simulated, waterflood recovery efficiency factor, that is, water drive stage recovery percent of reserves before polymer flooding is carried out according to mining site, to determine the water drive deadline node of laboratory experiment；The error range between stage recovery percent of reserves before stage recovery percent of reserves and mining site the progress polymer flooding in laboratory experiment water drive stage needs to control between ± 0.01%;Later, need to first pass through it is quantitative, become flow velocity experiment and determine reasonable injection rate when reaching the poly- drive stage recovery percent of reserves of mining site, quantitative polymer is injected with this preferred injection rate later, it is with this identical as mining site actual stage recovery percent of reserves to control poly- drive stage recovery percent of reserves;The rock core after driving will be completed to gather again according to different contrast experiment's schemes progress chemical flooding;Chemical flooding stage recovery percent of reserves increase rate is compared, chemical flooding parameter or optimal chemical flooding scheme are preferably gone out, realizes precisely comparison.

Description

The method and apparatus of chemical flooding effect after the poly- drive of comparison

Technical field

The present invention is under the jurisdiction of oil-gas field development field, is driven particularly with regard to the accurate comparison improved in recovery efficiency technique is poly- The method and apparatus of chemical flooding effect afterwards.

Background technology

Currently, part old filed can select chemical flooding after water drive to moisture content 98%, most common chemical flooding mode is poly- It closes object to drive, as technology of the Daqing oil field in terms of application polymer flooding is quite ripe.After polymer flooding is to certain time limit, Moisture content also can constantly rise, and also gradually this is taken over researcher with what technology after considering polymer flooding.This is just needed Mining site actual conditions are simulated with laboratory experiment, preferably subsequent chemical flooding mode.

Laboratory physical simulation experiment can generally carry out simulation core according to ASP flooding test before carrying out chemical flooding at present Early period water drive and polymer flooding.In the displacement parameter in the two preferred stages, laboratory experiment is always according to the experiment side at scene Case carries out, and many problems often occurs.Field test scheme be constant pressure water drive to moisture content 98%, then carry out certain PV numbers Polymer flooding, then carry out subsequent waterflooding.When field test scheme is water drive to moisture content 98%, the water drive of general sandstone oil reservoir is adopted Between yield is about 25%-35%, the pressure range of decrease is little, and rate of water cut increase is slow during field test water drive, when extraction well water breakthrough Moisture content rises rapidly after breakthrough.Laboratory experiment is according to scheme, that is, water drive of field test to moisture content 98%, it is found that with mining site Completely different situation.The first, rate of water cut increase is significantly larger than mining site；The second, waterflood recovery efficiency factor is significantly larger than field test； Barometric gradient and practical mining site are completely different between third, injection-production well, decline by a big margin.Although occur the result is that laboratory experiment Fully according to field test scheme carry out, but the water drive stage in addition to when displacement ends moisture content it is consistent with practical mining site other than, Remaining all key parameter such as water drive stage recovery percent of reserves, rate of water cut increase, barometric gradient range of decrease is different from mining site.Poly- The drive stage, if simulated according to the injection rate of mining site, the practical poly- drive stage recovery percent of reserves of poly- drive stage recovery percent of reserves and mining site Also there is larger difference.In addition, the physical model used in laboratory experiment is generally artificial core, simulation scale is small, with actual reservoir Difference is big.

If according to above routine experiment method, remaining oil saturation of each physical model after poly- drive has very big difference It is different, if continuing to inject chemical flooding solution into physical model, the stage recovery percent of reserves increase rate value pair that is obtained between each scheme It is poorer than property, lack science.

Invention content

In order to solve the prior art problem mentioned in background technology, the present invention proposes an effective solution scheme, i.e., Most important factor is only caught in the water drive stage：Stage recovery percent of reserves.According to practical mining site situation to be simulated, according to mining site into Waterflood recovery efficiency factor, that is, water drive stage recovery percent of reserves before row polymer flooding, to determine the water drive deadline of laboratory experiment Point；The mistake between stage recovery percent of reserves before stage recovery percent of reserves and mining site the progress polymer flooding in laboratory experiment water drive stage Poor range needs to control between ± 0.01%, so that when carrying out the experimental program comparison in polymer flooding stage in laboratory, Remaining oil saturation in rock core is identical;Later, need to first pass through it is quantitative, become flow velocity experiment determination and reach the mining site poly- drive stage Reasonable injection rate when recovery percent of reserves injects quantitative polymer with this preferred injection rate later, is controlled with this Poly- drive stage recovery percent of reserves is identical as mining site actual stage recovery percent of reserves;Abovementioned steps will be passed through again later and complete polymer flooding Several blocks of rock cores afterwards carry out chemical flooding according to different contrast experiment's schemes;Finally, the chemical flooding rank in each experimental program is compared Section recovery percent of reserves increase rate, preferably goes out chemical flooding parameter or optimal chemical flooding scheme, realizes precisely comparison.

Technical scheme of the present invention method comprises the following specific steps that,

The first step determines the trends exploitation feature of this mining site block according to mining site block to be simulated, according to this trends exploitation spy Sign determines water drive stage recovery percent of reserves and poly- drive recovery percent of reserves;The numerical value of the water drive stage recovery percent of reserves is expressed as A, with mining site Water drive stage recovery percent of reserves when water drive stage moisture content reaches 98% determines；Determine the geologic feature of the mining site block, institute It includes porosity, permeability, size distribution and gluing agent content to state geologic feature；

Second step prepares artificial core according to the mining site block geologic feature determined in the first step；

Third walks, and according to the poly- drive development situation of mining site block to be simulated and similar block, preferred polymer flooding is wanted in determination Parameter；

4th step filters out several blocks of rock cores from being prepared in second step in the rock core that finishes, the quantity of the rock core is B, to institute It states several blocks of rock cores and carries out Preparatory work of experiment, that is, distinguish evacuation, saturated water and saturated oils successively；

5th step, after what is determined in being walked according to third wants preferred parameters in polymer flooding to prepare poly- drive polymer solution and poly- drive Solution used when next step chemical flooding prepares injection water；

6th step connects displacement test device, starts to test；

7th step, water drive when water drive to mining site water drive stage moisture content reaches 98% respectively by the B blocks rock core obtained in the 4th step Stage recovery percent of reserves C, when C values are identical as the water drive stage recovery percent of reserves A values determined in the first step or error range is ± 0.01% Between when, the water drive stage stop；

8th step carries out polymer flooding to the completed B blocks rock core of water drive stage in the 7th step, during progress, with mining site reality The stage recovery percent of reserves in border polymer flooding stage is foundation, first part artificial core is used preferably to quantify polymer flooding under injection condition Optimal velocity, later, according to optimal velocity by remaining artificial core carry out polymer flooding, stop after displacement to design scheme Only；

The realization of this step is divided into two stages, respectively：

First stage, carry out that polymer is quantitative, speed change displacement test；

（1）Formulate polymer flooding experimental program：Each scheme polymer injection rate is constant, changes injection rate；

（2）It opens displacement pump and polymer corresponds to each valve of route, start to gather according to requirement of experiment setting displacement flow rate pump Object is closed to drive；

（3）According to the time interval record injection pressure in water drive stage, Produced Liquid oil pump capacity and water yield, and calculate moisture content and Stage recovery percent of reserves；

（4）According to the experimental procedure in this stage（1）The experimental program of middle formulation stops after injecting some amount under a certain velocity conditions Only polymer injection；Polymer flooding stage recovery percent of reserves numerical value in experiment with computing；

（5）D block rock cores in B block rock cores are repeated aforementioned（2）-（4）Step, the numerical value of B are more than the numerical value of D；

（6）By the polymer flooding stage recovery percent of reserves numerical value of the practical postpolymer flood in scene and the（4）The experiment obtained in step is poly- It closes object drive stage recovery percent of reserves numerical value to be compared, when error range is when between ± 0.01%, selection is driven with the experimental Polymer The corresponding experimental program of stage recovery percent of reserves numerical value is the optimization experiment scheme screened；

Second stage, the optimization experiment scheme filtered out according to the first stage are polymerize using B residue E block rock cores in the block Object drives phase experiments, determines polymer injection rate；This stage is as follows：

（1）It opens displacement pump and polymer corresponds to each valve of route, the optimization experiment scheme filtered out according to the first stage In injection rate setting displacement flow rate pump start polymer flooding；

（2）Injection pressure, Produced Liquid oil pump capacity and water yield are recorded at regular intervals, and calculate moisture content and stage extraction journey Degree；

（3）The optimization experiment scheme filtered out according to the first stage, stopping note is poly- after injecting certain quantifying polymers；

（4）Repeat the aforementioned of this stage（1）-（3）Remaining E blocks rock core in B block rock cores is completed polymer flooding experiment by step；

The E blocks rock core that postpolymer flood is completed in 8th step is carried out chemical flooding according to different contrast experiment's schemes, driven by the 9th step For to stopping after design scheme；

Tenth step compares the chemical flooding stage recovery percent of reserves increase rate in each contrast experiment's scheme of the 9th step, preferably goes out chemistry Parameter or optimal chemical flooding scheme are driven, realizes precisely comparison, the specific steps are；

（1）The experimental data of each scheme is counted and made table, draws experimental result curve；

（2）Comparative analysis difference chemical flooding parameter is such as the chemical flooding stage recovery percent of reserves under concentration, viscosity or chemical flooding scheme Increase rate；

（3）Obtain chemical flooding optimized parameter or optimal chemical flooding scheme.

In the 9th step in abovementioned steps, if contrast experiment's scheme only has a kind of chemical flooding mode after using poly- drive, So steps are as follows for specific implementation：

（1）It opens displacement pump and chemical flooding corresponds to each valve of route, displacement flow rate pump beginning is set according to requirement of experiment It learns and drives；

（2）According to time interval record injection pressure, Produced Liquid, oil pump capacity and the water yield in water drive stage, and calculate moisture content With stage recovery percent of reserves.Judge whether Produced Liquid carries out demulsification processing according to chemical flooding mode.If desired it is demulsified, is produced in record Demulsifier is added in the forward direction test tube of liquid, oil pump capacity and water yield, turn on agitator carries out Produced Liquid demulsification later.To be mixed one Blender is closed after minute, each liquid volume is measured；The directly metering if it need not be demulsified；

（3）According to a certain amount of rear stopping chemical injection solution of requirement of experiment injection；

（4）If there is subsequent waterflooding in experimental program, the metaideophone water after stopping chemical injection solution, experimental program to be done are needed After terminate to test；

（5）It repeats aforementioned（1）-（4）E blocks rock core is completed to test by step according to experimental program.

In the 9th step in abovementioned steps, if contrast experiment's scheme has N kind chemical flooding modes, N big after using poly- drive In or be equal to 2, then be divided into accordance with the following steps three phases realization：

First stage：N-1 sections of chemical floodings are for the quantitative of stage, speed change displacement test；

（1）Formulate N-1 sections of chemical flooding phase experiments schemes：Each scheme chemical agent determines that injection rate is constant according to field condition, Change injection rate；

（2）Each valve that displacement pump and chemical agent correspond to route is opened, setting displacement flow rate pump according to requirement of experiment starts the N-1 sections of chemical floodings.Judge whether Produced Liquid carries out demulsification processing according to chemical flooding mode.If desired be demulsified, record Produced Liquid, Demulsifier is added in the forward direction test tube of oil pump capacity and water yield, turn on agitator carries out Produced Liquid demulsification later.One point to be mixed Blender is closed after clock, and each liquid volume is measured；

（3）According to the time interval record injection pressure in water drive stage, Produced Liquid oil pump capacity and water yield, and calculate moisture content and Stage recovery percent of reserves；

（4）A certain amount of rear stopping is injected under the conditions of certain speed note the chemical solution according to requirement of experiment；

（5）It repeats aforementioned（2）-（4）Step, by the part F blocks rock core in E block rock cores according to the（1）Experimental program is walked to complete in fact It tests；

（6）The experiment side being consistent therewith is screened according to the chemical flooding stage recovery percent of reserves numerical value after the practical chemical flooding in scene Case, allowable error are ± 0.01%.

Second stage：According to the optimization experiment scheme of first stage, N-1 sections of chemical agent injection rates are determined.It will be in E blocks Remaining G blocks rock core carry out N-1 sections of chemical flooding phase experiments.

（1）It opens displacement pump and N-1 sections of chemical agents corresponds to each valve of route, according to the injection rate of preferred embodiment Setting displacement flow rate pump starts N-1 sections of chemical floodings；

（2）Injection pressure, Produced Liquid oil pump capacity and water yield are recorded at regular intervals, and calculate moisture content and stage extraction journey Degree.Judge whether Produced Liquid carries out demulsification processing according to chemical flooding mode.If desired be demulsified, record Produced Liquid, oil pump capacity and Demulsifier is added in the forward direction test tube of water yield, turn on agitator carries out Produced Liquid demulsification later.It is closed after one minute to be mixed Blender measures each liquid volume；

（3）Stop injection after injecting a certain amount of N-1 chemical agents according to requirement of experiment；

（4）It repeats aforementioned（1）-（3）Remaining G blocks rock core in E block rock cores is completed N-1 sections of chemical flooding experiments by step；

Phase III：The aforementioned G block rock cores that N-1 sections of chemical floodings are finished after speed is preferred are subjected to N sections of chemical floodings, displacement is extremely Stop after design scheme.

（1）It opens displacement pump and N sections of chemical floodings corresponds to each valve of route, according to requirement of experiment setting displacement pump stream Speed starts N sections of chemical floodings；

（2）According to time interval record injection pressure, Produced Liquid, oil pump capacity and the water yield in water drive stage, and calculate moisture content With stage recovery percent of reserves.Judge whether Produced Liquid carries out demulsification processing according to chemical flooding mode.If desired it is demulsified, is produced in record Demulsifier is added in the forward direction test tube of liquid, oil pump capacity and water yield, turn on agitator carries out Produced Liquid demulsification later.To be mixed one Blender is closed after minute, each liquid volume is measured；

（3）According to a certain amount of rear stopping N sections of chemical solutions of note of requirement of experiment injection；

（4）If there is subsequent waterflooding in experimental program, the metaideophone water after stopping N sections of chemical solutions of note, reality to be done are needed Terminate experiment after proved recipe case.

（5）It repeats aforementioned（1）-（4）G blocks rock core is completed to test by step according to experimental program；

Wherein, E=G+F.

The device of the method for chemical flooding effect after being driven for realizing described kind of accurate comparison is poly- is given below, which includes Artificial core, displacement pump, pipeline, six logical, water filling piston container, polymer injection piston container, chemical injection piston container, top Valve, lower part valve, pressure gauge, control valve, core holding unit, common cable and heat-insulated cable, are unique in that：Institute It further includes self-measuring device, insulating box, blender and computer to state device；

Wherein, the displacement pump is led to by pipeline and six connects, and described six cross pipeline all gathers with water filling piston container, note respectively Close the lower part valve connection of object piston container and chemical injection piston container；The water filling piston container and polymer injection piston The upper valve of container and chemical injection piston container is led to by pipeline and six to be connect；Described six logical upper connection pressure gauges, six It crosses pipeline all to connect with the control valve of left part on the core holding unit, the core holding unit includes artificial core, rock The control valve of heart clamp holder right part is connected by pipeline with the self-measuring device, and the self-measuring device, which is embedded with, to be stirred Device is mixed, and is connected with the computer by heat-insulated cable, the computer is connected by common cable with displacement pump；

The displacement pump to this driving device for providing power；Described six lead to and provide multiple accesses to driving device；The note Water piston container, polymer injection piston container and the molten device of chemical injection piston are for storing injection water, injection of polymer and note Enter the container of chemical agent；The pressure gauge is used to record the injection pressure of liquid；The artificial core is for simulating mining site block Physical property；

The self-measuring device is accepted through the Produced Liquid after rock core, can show current oil mass and liquid measure, and can will be above-mentioned Value is transferred to the computer；The blender being placed in the self-measuring device can be by the switch on self-measuring device Working order is controlled, blender rotates and carries out demulsification operation to Produced Liquid after unlatching；

The computer can calculate water drive rank under the control of built-in computer program by the saturation oil mass of artificial core Section recovery percent of reserves reaches extraction oil mass when certain value, when the calculating produces the current oil acquired in oil mass and self-measuring device When measuring consistent, computer can pass out the instruction for stopping fluid injection by common cable to displacement pump, and displacement pump is made to be stopped；Institute Practical water drive stage recovery percent of reserves can be obtained by stating after computer calculates extraction oil mass, when which reaches 98% with mining site moisture content Stage recovery percent of reserves between the error range that allows between ± 0.01%；

The insulating box is used to make the entire experiment flow of the present apparatus to keep at the formation temperature.

The present invention has the advantages that：

Method given by the present invention can effectively ensure the extraction in laboratory experiment water drive stage and the water drive stage of practical mining site Degree is completely the same, and the recovery percent of reserves in polymer flooding stage can also be controlled in requirement of experiment value, ensure that subsequent chemistry drives the stage Remaining oil saturation in rock core is consistent, can ensure that subsequent chemistry drives the drive stage with striking contrast in this way.After poly- drive The chemical flooding stage carry out comparison displacement test according to comparison scheme, finally carry out the chemical flooding stage Flooding Efficiency comparison.This Invention is by this method, it can be ensured that effective accurate comparison in chemical flooding stage, it can be ensured that preferably goes out really effectiveization It learns and drives parameter or scheme.

Description of the drawings：

Fig. 1 is compacting tool set schematic diagram.

Fig. 2 is the structural schematic diagram of experiment artificial core.

Fig. 3 is the composition connection diagram of device of the present invention.

Fig. 4 is each scheme injection PV numbers-recovery ratio graph of relation in the specific implementation given by the present invention.

1- long side plates, 2- short side plates, 3- nuts, 4- fixed links, 5- pressing plates, 6- pedestals, 7- artificial cores, 8- displacements in figure Pump, 9- pipelines, 10- six be logical, 11- water filling pistons container, 12- polymer injection pistons container, 13- chemical injection piston containers, 14- Upper valve, the lower parts 15- valve, 16- pressure gauges, 17- control valves, 18- core holding units, 19- self-measuring devices, 20- Blender, 21- insulating boxs, the heat-insulated cables of 22-, 23- computers, 24- common cables.

Specific implementation mode：

The invention will be further described below in conjunction with the accompanying drawings：

In the following, providing the specific implementation step of the present invention first.

Inventive step one：Determine mining site block to be simulated, determine the parameters such as representative porosity, permeability, It determines block size distribution, gluing agent content, water drive stage recovery percent of reserves A is determined according to the block trends exploitation feature, determine It is poly- to drive recovery percent of reserves；

（1）The porosity of rock in reservoir, permeability, size distribution and gluing agent content are determined according to block Use of Geophysical Data；

（2）According to the production development data of each water injection well of block and producing well, obtains block and reach in water drive stage moisture content The stage recovery percent of reserves that water drive stage recovery percent of reserves and polymer flooding stage when 98% reach.

Inventive step two：Artificial core is prepared according to actual reservoir situation, size is length（More than or equal to 60cm）* wide 4.5cm* high 4.5cm so that hole is oozed and the parameters such as size distribution are consistent with actual reservoir；

Artificial core preparation process is as follows:

（1）Prepare compacting tool set；

Splice assembling, schematic diagram such as Fig. 1 institutes according to the suitably long side plate of rock core size selection and short side plate and by itself and each component Show.Long side plate and short side plate nested encryptions, are both embedded on the groove of pedestal, and fixed by fixed link.When to be pressed, Pressing plate is placed in above material.

The length of the long side plate is 65-67cm, width 1-1.5cm, is highly 13-14cm.

The length of the short side plate is 30-30.5cm, and width is that 1-1.5cm is consistent with long side plate, is highly 13- 14cm is consistent with long side plate.

The length of the pressing plate is 59.8-60cm, width 29-29.5cm, is highly 13-16cm.

The length of the pedestal is 70-74cm, width 35-38cm, is highly 1-1.5cm.

（2）Prepare material；

Quartzy Grains used in physical model is determined according to parameters such as the porosity of block, permeability, size distribution, gluing agent contents Number and quality.

（3）It is die-filling to rub sand with the hands；

The quartz sand for determining mesh number quality is mixed with a certain amount of epoxy resin, is packed into ready compacting after mixing After material is dispersed evenly to mold, pressing plate is placed in above material for mold.

（4）Compacting；

Pressing pressure and time are set, pressure break machine is manipulated and pressurizes to compacting tool set, materials inside is made to shape.Completion to be pressed Afterwards, mold is removed.

（5）Exposed rock core drying；

The exposed rock core suppressed is placed in certain time in insulating box, prepares cutting after to be dried.

（6）Exposed rock core cutting；

The exposed rock core of drying is cut according to required size with cutting machine, the exposed tabula rasa rock core met the size requirements.

Made artificial core finished product is as shown in Figure 2.It is to increase rock core hole that the rock core length, which is more than or equal to 60cm, Total volume value, it is ensured that core experiment error is smaller.

Inventive step three：According to mining site situation and the poly- drive development situation of similar block, preferred polymer is wanted in determination Parameter is driven, enough rock core B blocks are screened, carries out Preparatory work of experiment, evacuation, saturated water, saturated oils, connection experimental facilities；

（1）According to mining site situation and the poly- drive development situation of similar block, experiment type of polymer, solution concentration are determined；

（2）According to block real permeability, the artificial core made in inventive step two is screened, selects satisfactory artificial rock Heart B blocks；

（3）By experiment artificial core evacuation, saturated water, saturated oils；

（4）Poly- drive polymer solution and solution used when next step chemical flooding after poly- drive are prepared, injection water is prepared；

（5）Experimental provision is connected, preparation starts to test.Experimental provision connection figure is as shown in Figure 3.Displacement pump is logical by pipeline and six Connection, six all cross pipeline respectively under water filling piston container, polymer injection piston container and chemical injection piston container The connection of portion valve, the upper valve of three piston containers is led to by pipeline and six to be connect, six it is logical on be connected with pressure gauge, six all It crosses pipeline to connect with the control valve of left part on core holding unit, core holding unit includes artificial core, core holding unit right part Control valve connected with self-measuring device by pipeline, self-measuring device is embedded with blender, and passes through heat-insulated cable It is connected with computer, computer is connected by common cable with displacement pump.

The displacement is pumped provides power to entire driving device.

Described six lead to and provide multiple accesses for device.

The water filling piston container, polymer injection piston container and the molten device of chemical injection piston are injection water, injection polymerization Object, the container for injecting chemical agent.If there is N kind chemical agents in experimental program in addition to the polymer, N number of piston container is needed to distinguish It is packed into each chemical agent.

The injection pressure of the pressure gauge record liquid.

The artificial core is the model close with mining site block physical property.

The core holding unit fixes artificial core, has preferable bearing capacity.

The self-measuring device accepts Produced Liquid, can show current oil mass and liquid measure, and can be transferred to above-mentioned value Computer.Its interior blender can control working order by the switch on self-measuring device, and blender rotates after unlatching Demulsification work is carried out to Produced Liquid.

The computer can reach certain value by the saturation oil mass of artificial core to calculate water drive stage recovery percent of reserves （Allowable error is ± 0.01%）When extraction oil mass, when the calculating produces the current oil acquired in oil mass and self-measuring device When measuring consistent, computer can pass out the instruction for stopping fluid injection by common cable to displacement pump, and displacement pump is made to be stopped.

The insulating box makes entire experiment flow keep at the formation temperature.

Inventive step four：Rock core water drive extremely, the water drive stage identical as mining site water drive stage recovery percent of reserves during B blocks are tested Stop；

Steps are as follows for water drive stage displacement test：

（1）Displacement flow rate pump is set, displacement test is started；

（2）Be first the water drive stage, record the injection pressure in the stage displacement process at regular intervals, Produced Liquid it is fuel-displaced Amount and water yield, and calculate moisture content and stage recovery percent of reserves；

（3）Water drive stage recovery percent of reserves C when reaching 98% using mining site water drive stage moisture content is basis for estimation, such as experimentation In water drive stage recovery percent of reserves when being C, computer can make displacement pump be stopped, the recovery percent of reserves in water drive stage and C values Error range is 0.01%；

（4）It repeats aforementioned（1）-（3）B blocks rock core is finished water drive experiment by step.

Inventive step five：Polymer flooding is carried out to above-mentioned B blocks rock core.With the stage extraction in scene practical polymer flooding stage Degree is foundation, and the optimal velocity of polymer flooding under injection condition is preferably quantified with part artificial core.It will according to optimal velocity Remaining artificial core carries out polymer flooding, stops after displacement to design scheme；

On the basis of completing in the four water drive stage of inventive step, next step polymer flooding is carried out to artificial core model.It is divided into two A stage, each stage etch are as follows：

First stage：Polymer is quantitative, speed change displacement test；

（1）Formulate polymer flooding experimental program：Each scheme polymer injection rate is constant, changes injection rate；

（2）It opens displacement pump and polymer corresponds to each valve of route, start to gather according to requirement of experiment setting displacement flow rate pump Object is closed to drive；

（3）According to the time interval record injection pressure in water drive stage, Produced Liquid oil pump capacity and water yield, and calculate moisture content and Stage recovery percent of reserves；

（4）A certain amount of rear stopping polymer injection being injected under the conditions of certain speed according to requirement of experiment；

（5）It repeats aforementioned（2）~（4）Step, by the part D blocks rock core in B block rock cores according to the（1）Experimental program is walked to complete in fact It tests；

（6）The experiment being consistent therewith is screened according to the polymer flooding stage recovery percent of reserves numerical value of the practical postpolymer flood in scene Scheme, allowable error are ± 0.01%.

Second stage：According to the optimization experiment scheme of first part, polymer injection rate is determined.By B residue E in the block Block rock core carries out polymer flooding phase experiments.

（1）It opens displacement pump and polymer corresponds to each valve of route, set and drive according to the injection rate of preferred embodiment Start polymer flooding for flow rate pump；

（2）Injection pressure, Produced Liquid oil pump capacity and water yield are recorded at regular intervals, and calculate moisture content and stage extraction journey Degree；

（3）It injects to stop noting after certain weight polymers according to requirement of experiment and gather；

（4）It repeats aforementioned（1）-（3）Remaining E blocks rock core in B block rock cores is completed polymer flooding experiment by step；

Inventive step six：The E blocks rock core of abovementioned steps postpolymer flood is subjected to chemical flooding according to different contrast experiment's schemes, is driven For to stopping after design scheme；

This step includes two kinds of situations：

The first：There was only a kind of chemical flooding mode after poly- drive；

（1）It opens displacement pump and chemical flooding corresponds to each valve of route, displacement flow rate pump beginning is set according to requirement of experiment It learns and drives；

（2）According to time interval record injection pressure, Produced Liquid, oil pump capacity and the water yield in water drive stage, and calculate moisture content With stage recovery percent of reserves.Judge whether Produced Liquid carries out demulsification processing according to chemical flooding mode.If desired it is demulsified, is produced in record Demulsifier is added in the forward direction test tube of liquid, oil pump capacity and water yield, turn on agitator carries out Produced Liquid demulsification later.To be mixed one Blender is closed after minute, each liquid volume is measured；The directly metering if it need not be demulsified；

（3）According to a certain amount of rear stopping chemical injection solution of requirement of experiment injection；

（4）If there is subsequent waterflooding in experimental program, the metaideophone water after stopping chemical injection solution, experimental program to be done are needed After terminate to test.

（5）It repeats aforementioned（1）-（4）E blocks rock core is completed to test by step according to experimental program.

Second：It is there are two types of after poly- drive or two or more（N kinds）Chemical flooding mode.

This kind of situation includes three phases：

First stage：N-1 sections of chemical floodings are for the quantitative of stage, speed change displacement test；

（1）Formulate N-1 sections of chemical flooding phase experiments schemes：Each scheme chemical agent determines that injection rate is constant according to field condition, Change injection rate；

（2）Each valve that displacement pump and chemical agent correspond to route is opened, setting displacement flow rate pump according to requirement of experiment starts the N-1 sections of chemical floodings.Judge whether Produced Liquid carries out demulsification processing according to chemical flooding mode.If desired be demulsified, record Produced Liquid, Demulsifier is added in the forward direction test tube of oil pump capacity and water yield, turn on agitator carries out Produced Liquid demulsification later.One point to be mixed Blender is closed after clock, and each liquid volume is measured；

（3）According to the time interval record injection pressure in water drive stage, Produced Liquid oil pump capacity and water yield, and calculate moisture content and Stage recovery percent of reserves；

（4）A certain amount of rear stopping is injected under the conditions of certain speed note the chemical solution according to requirement of experiment；

（5）It repeats aforementioned（2）-（4）Step, by the part F blocks rock core in E block rock cores according to the（1）Experimental program is walked to complete in fact It tests；

（6）The experiment side being consistent therewith is screened according to the chemical flooding stage recovery percent of reserves numerical value after the practical chemical flooding in scene Case, allowable error are ± 0.01%.

Second stage：According to the optimization experiment scheme of first stage, N-1 sections of chemical agent injection rates are determined.It will be in E blocks Remaining G blocks rock core carry out N-1 sections of chemical flooding phase experiments.

（1）It opens displacement pump and N-1 sections of chemical agents corresponds to each valve of route, according to the injection rate of preferred embodiment Setting displacement flow rate pump starts N-1 sections of chemical floodings；

（2）Injection pressure, Produced Liquid oil pump capacity and water yield are recorded at regular intervals, and calculate moisture content and stage extraction journey Degree.Judge whether Produced Liquid carries out demulsification processing according to chemical flooding mode.If desired be demulsified, record Produced Liquid, oil pump capacity and Demulsifier is added in the forward direction test tube of water yield, turn on agitator carries out Produced Liquid demulsification later.It is closed after one minute to be mixed Blender measures each liquid volume；

（3）Stop injection after injecting a certain amount of N-1 chemical agents according to requirement of experiment；

（4）It repeats aforementioned（1）-（3）Remaining G blocks rock core in E block rock cores is completed N-1 sections of chemical flooding experiments by step；

Phase III：The aforementioned G block rock cores that N-1 sections of chemical floodings are finished after speed is preferred are subjected to N sections of chemical floodings, displacement is extremely Stop after design scheme.

（1）It opens displacement pump and N sections of chemical floodings corresponds to each valve of route, according to requirement of experiment setting displacement pump stream Speed starts N sections of chemical floodings；

（2）According to time interval record injection pressure, Produced Liquid, oil pump capacity and the water yield in water drive stage, and calculate moisture content With stage recovery percent of reserves.Judge whether Produced Liquid carries out demulsification processing according to chemical flooding mode.If desired it is demulsified, is produced in record Demulsifier is added in the forward direction test tube of liquid, oil pump capacity and water yield, turn on agitator carries out Produced Liquid demulsification later.To be mixed one Blender is closed after minute, each liquid volume is measured；

（3）According to a certain amount of rear stopping N sections of chemical solutions of note of requirement of experiment injection；

（4）If there is subsequent waterflooding in experimental program, the metaideophone water after stopping N sections of chemical solutions of note, reality to be done are needed Terminate experiment after proved recipe case.

（5）It repeats aforementioned（1）-（4）G blocks rock core is completed to test by step according to experimental program.

Inventive step seven：The chemical flooding stage recovery percent of reserves increase rate in each experimental program in inventive step six is compared, It is preferred that going out chemical flooding parameter or optimal chemical flooding scheme, precisely comparison is realized.

（1）The experimental data of each scheme is counted and made table, draws experimental result curve；

（2）Comparative analysis difference chemical flooding parameter is such as the chemical flooding stage recovery percent of reserves under concentration, viscosity or chemical flooding scheme Increase rate；

（3）Obtain chemical flooding optimized parameter or optimal chemical flooding scheme.

Embodiment

Certain oil field H blocks, reservoir is based on sandstone, average effective caliper 5.8m, and physical property is preferable, and mean permeability is 633md, rock porosity is 25.8% or so in layer.Grade in, based on fine sand, median grain diameter 0.05~0.26mm it Between, medium grain degree of sorting.Sand grains psephicity is general, and based on argillaceous agglutination, cementation type is that contact is cementing.In layer of sand Middle development has calcareous band, inside contain Ostracods, and be mingled with shale band, there is various oil-bearing occurrence.It is full of Oil, rich oil-bearing occurrence occupy thick oil pay；And oil-containing, oil immersion occupy oil sheet and off-balancesheet layer.The block was in waterflooding development 30 years Moisture content reaches 98% afterwards, and water drive stage recovery percent of reserves is 25.7%, and poly- drive stage recovery percent of reserves is after polymer injection 0.6PV 23.56%, functional polymer inject 0.6PV after functional polymer drive stage recovery percent of reserves be 10.3%, plan in next step into Row binary is driven, further Remaining Oil.This kind of operating type at scene is that postpolymer flood continues two kinds of chemical floodings, Wherein functional polymer drive represents N-1 sections of chemical flooding modes, and binary drive represents N sections of chemical flooding modes.

Now using the oil field actual conditions as foundation, each step content for illustrating the present invention：

Step 1：It determines mining site block to be simulated, determines the parameters such as representative porosity, permeability, determines block Size distribution, gluing agent content determine water drive stage recovery percent of reserves according to the block trends exploitation feature；

（1）The porosity that the analog block is obtained according to the Use of Geophysical Data of the block is 24.6%, permeability 633md, in, it is thin Based on sand, median grain diameter is between 0.05~0.26mm, medium grain degree of sorting.Sand grains psephicity is general, with argillaceous agglutination Based on, cementation type is that contact is cementing.

（2）According to the production development data of each injection-production well of the block, it is 25.7% to obtain water drive stage recovery percent of reserves, polymerization Poly- drive stage recovery percent of reserves is 23.56% after object injects 0.6PV, and functional polymer drives rank after functional polymer injects 0.6PV Section recovery percent of reserves is 10.3%.

Step 2：It is prepared according to actual reservoir situation（7）Artificial core, size are length 60cm, wide 4.5cm, height 4.5cm so that hole is oozed and the parameters such as size distribution are consistent with actual reservoir；

Artificial core preparation process is as follows:

（1）Prepare compacting tool set；

It chooses（1）The length of long side plate is 65cm, width 1cm, is highly 13.5cm.It chooses（2）The length of short side plate is 30.5cm, width 1cm are highly 13.5cm.It chooses（6）The length of pedestal is 70cm, width 36cm, is highly 1.2cm. The length for choosing pressing plate is 59.8cm, width 29.3cm, is highly 14cm.

Long side plate and short side plate nested encryptions, are both embedded on the groove of pedestal, and pass through（4）Fixed link is fixed. It, will when to be pressed（5）Pressing plate is placed in above material.

（2）Prepare material；

Choose 50 mesh quartz sand 273g, 80 mesh quartz sand 3920g, 270 mesh quartz sand 6780g, 340 mesh quartz sand 3321g.

（3）It is die-filling to rub sand with the hands；

Three is mixed and stirred for rubbing sand with the hands with quartz sand by extracting epoxy resin 1467g, alcohol 2g, ethylenediamine 104g after mixing, It is packed into compacting tool set after quartz sand particle is uniformly cementing, sieve plate is used in combination to strike off.Quartz sand particle is dispersed evenly to compacting tool set Afterwards, pressing plate is placed in above material.

（4）Compacting；

Mold equipped with material is moved to below pressure break machine, pressure 3MPa is set, is persistently suppressed 20 minutes.After the completion of to be pressed Remove mold.

（5）Exposed rock core drying；

The exposed rock core suppressed is placed in insulating box 48 hours, prepares cutting after to be dried.

（6）Exposed rock core cutting；

The exposed rock core of drying is cut into 10 pieces according to required size with cutting machine, infiltration is tested to the artificial core of well cutting Rate obtains 10 blocks of exposed rock cores met the size requirements.

Step 3：Development situation is driven according to the polymer flooding of mining site situation and similar block, functional polymer, is determined Preferred binary combination flooding parameter is wanted, 10 pieces of enough rock cores are screened, carries out Preparatory work of experiment, evacuation, saturated water, saturated oils, company Connect experimental facilities；

（1）Development situation is driven according to the polymer flooding of mining site situation and similar block, functional polymer, determines polymer flooding Polymer used in stage is to divide polymer in 12,000,000 molecular weight, and experiment divides polymer solution concentration to be 1200mg/L in. Determine that functional polymer drives solution, experimental feature polymer flooding solution concentration is 1000mg/L.Experiment binary solution In surfactant be glycine betaine, petroleum sulfonate.

（2）According to block real permeability, the artificial core made in screening step two selects satisfactory artificial rock 10 pieces of the heart；

After testing air permeability to the artificial core made in step 2, each core parameters are as follows：

1 artificial core parameter of table

Number	Length（cm）	Effective sectional area（cm2）	Air permeability (md)
				171213A-1	60.11	19.71	633
171213A-2	60.13	19.71	634
				171213A-3	60.12	19.71	633
171213A-4	60.11	19.71	632
				171213A-5	60.12	19.71	633
171213A-6	60.11	19.71	633
				171213A-7	60.12	19.71	633
171213A-8	60.13	19.71	634
				171213A-9	60.12	19.71	632
171213A-10	60.11	19.71	633

Above-mentioned rock core is satisfied by requirement of experiment.

（3）By experiment artificial core evacuation, saturated water, saturated oils；

（4）Compound concentration is to divide polymer solution in 1200 mg/L, and compound concentration is the functional polymer of 1000 mg/L Divide the binary solution of+0.3% glycine betaine of polymer in solution and 1200 mg/L, prepares injection filtration sewage；

（5）According to Fig. 3 connection experimental provisions, preparation starts to test.

Step 4：Rock core water drive in 10 pieces of experiments is extremely identical as mining site water drive stage recovery percent of reserves, and the water drive stage stops Only；

Steps are as follows for water drive stage displacement test：

（1）Setting（8）Displacement flow rate pump is 0.3mL/min, starts displacement test；

（2）It is first the water drive stage, the injection pressure in the stage displacement process, the oil pump capacity of Produced Liquid is recorded every 20min With water yield, and moisture content and stage recovery percent of reserves are calculated；

（3）Water drive stage recovery percent of reserves 25.7% when reaching 98% with mining site water drive stage moisture content is such as tested for basis for estimation When water drive stage recovery percent of reserves in the process is 25.7%, computer can make displacement pump be stopped, the recovery percent of reserves in water drive stage Error range with 25.7% value is 0.01%；

（4）It repeats aforementioned（1）-（3）10 blocks of rock cores are finished water drive experiment by step.

Step 5：Polymer flooding is carried out to above-mentioned 10 blocks of rock cores.Journey is produced with the stage in scene practical polymer flooding stage Degree is foundation, and 4 pieces of artificial cores preferably quantify the optimal velocity of polymer flooding under injection condition.It will be remaining according to optimal velocity 6 pieces of artificial cores carry out polymer flooding, stop after displacement to design scheme；

On the basis of completing in the step 4 water drive stage, next step polymer flooding is carried out to artificial core model.It is divided into two ranks Section, each stage etch are as follows：

First stage：Polymer is quantitative, speed change displacement test；

（1）Formulate polymer flooding experimental program：

Poly- drive of table 2 is preferably injected speed experiments scheme

Serial number	Plan content
		Scheme one	Water drive drives 0.6PV to stage recovery percent of reserves 25.7%+ is poly-（Injection rate 0.2mL/min）
Scheme two	Water drive drives 0.6PV to stage recovery percent of reserves 25.7%+ is poly-（Injection rate 0.3mL/min）
		Scheme three	Water drive drives 0.6PV to stage recovery percent of reserves 25.7%+ is poly-（Injection rate 0.4mL/min）
Scheme four	Water drive drives 0.6PV to stage recovery percent of reserves 25.7%+ is poly-（Injection rate 0.5mL/min）

（2）It opens displacement pump and polymer corresponds to each valve of route, start to gather according to requirement of experiment setting displacement flow rate pump It closes object to drive, first carries out scheme one；

（3）Injection pressure, Produced Liquid oil pump capacity and water yield are recorded every 20min, and calculates moisture content and stage recovery percent of reserves；

（4 inject 0.6PV under 0.2 mL/min velocity conditions according to experimental program after stop polymer injection；

（5）It repeats aforementioned（2）-（4）Step, by 4 blocks of rock cores in 10 blocks of rock cores according to the（1）It walks experimental program and completes experiment；

（6）The experiment being consistent therewith is screened according to the polymer flooding stage recovery percent of reserves numerical value of the practical postpolymer flood in scene Scheme.

The experimental results are shown inthe following table：

Poly- drive of table 3 is preferably injected experimental velocity

As can be seen that the experimental result of scheme two and the polymer flooding stage of the practical postpolymer flood in scene adopt from experimental result Go out degree to meet, therefore, chooses injection rates of the 0.3mL/min as the polymer flooding stage

Second part：Remaining 6 blocks of rock cores are subjected to polymer flooding phase experiments.

（1）It opens displacement pump and polymer corresponds to each valve of route, set displacement flow rate pump and start as 0.3mL/min Polymer flooding；

（2）Injection pressure, Produced Liquid oil pump capacity and water yield are recorded every 20min, and calculates moisture content and stage recovery percent of reserves；

（3）It injects to stop noting after 0.6PV polymer according to requirement of experiment and gather；

（4）It repeats aforementioned（1）-（3）Remaining 6 blocks of rock cores are completed polymer flooding experiment by step；

Experimental result after the poly- drive of table 4

Step 6：6 blocks of rock cores of abovementioned steps postpolymer flood are subjected to chemical flooding according to different contrast experiment's schemes, displacement is extremely Stop after design scheme；

On the basis of step 5 water drive and polymer flooding stage are completed, is carried out to artificial core model functional in next step polymerize Object drives.This step represents N-1 sections of chemical flooding displacement modes, is divided into two stages, each stage etch is as follows：

First stage：Functional polymer is quantitative, speed change displacement test；

（1）It formulates functional polymer and drives experimental program：

Experimental program is as follows：

5 functional polymer of table drives experimental program

（2）It opens displacement pump and functional polymer corresponds to each valve of route, displacement flow rate pump is set according to requirement of experiment Start functional polymer to drive, first carries out scheme five；

（3）Injection pressure, Produced Liquid oil pump capacity and water yield are recorded every 20min, and calculates moisture content and stage recovery percent of reserves. Demulsifier is added in the forward direction test tube of record Produced Liquid, oil pump capacity and water yield, it is broken to carry out Produced Liquid for turn on agitator later Breast.Blender is closed after one minute to be mixed, each liquid volume is measured；

（4 0.6PV is injected under 0.2 mL/min velocity conditions according to experimental program after stop pouring functions polymer；

（5）It repeats aforementioned（2）-（4）Step, by 4 blocks of rock cores in 6 blocks of rock cores according to the（1）It walks experimental program and completes experiment；

（6）Stage recovery percent of reserves numerical value is driven according to the functional polymer of live actual functional capability postpolymer flood to screen therewith The experimental program being consistent.

The experimental results are shown inthe following table：

The drive of 6 functional polymer of table is preferably injected experimental velocity

As can be seen that the functional polyalkylene of the experimental result of scheme six and live actual functional capability postpolymer flood from experimental result It closes object drive stage recovery percent of reserves to meet, therefore, chooses the injection rate that 0.3mL/min drives the stage as functional polymer.

Second stage：According to the optimization experiment scheme six of first stage, determine that functional polymer drives injection rate and is 0.3mL/min.Last remaining 2 blocks of rock cores are subjected to functional polymer and drive phase experiments.

（1）It opens displacement pump and functional polymer solution corresponds to each valve of route, displacement pumps injection rate setting For 0.3mL/min, starts functional polymer and drive；

（2）Injection pressure, Produced Liquid oil pump capacity and water yield are recorded every 20min, and calculates moisture content and stage recovery percent of reserves. Demulsifier is added in the forward direction test tube of record Produced Liquid, oil pump capacity and water yield, it is broken to carry out Produced Liquid for turn on agitator later Breast.Blender is closed after one minute to be mixed, each liquid volume is measured；

（3）Stop injection after injecting 0.6PV functional polymer solution according to requirement of experiment；

（4）It repeats aforementioned（1）-（3）Remaining 2 blocks of rock cores are completed functional polymer and drive experiment by step；

Phase III：Aforementioned 2 blocks of rock cores that functional polymer drive is finished after speed is preferred are subjected to binary combination flooding, displacement Stop after to design scheme.This step represents N sections of chemical flooding displacement modes；

Experimental program is as follows：

7 binary combination flooding experimental program of table

（1）Open each valve that displacement pump and binary combination flooding correspond to route, according to requirement of experiment set displacement flow rate pump as 0.3mL/min starts binary combination flooding；

（2））Injection pressure, Produced Liquid, oil pump capacity and water yield are recorded every 20min, and calculates moisture content and stage extraction journey Degree.Demulsifier is added in the forward direction test tube of record Produced Liquid, oil pump capacity and water yield, turn on agitator carries out Produced Liquid later Demulsification.Blender is closed after one minute to be mixed, each liquid volume is measured；

（3）It is injected after 1PV according to requirement of experiment and stops note binary solution；

（4）The metaideophone water after stopping noting binary solution, terminates experiment after experimental program to be done.

（5）The binary solution for dividing+0.3% petroleum sulfonate of polymer in 1200 mg/L, weight are prepared according to experimental program It is multiple aforementioned（1）-（4）2 blocks of rock cores are completed to test by step according to experimental program.

Step 7：It compares the binary in inventive step six in each experimental program and drives stage recovery percent of reserves increase rate, preferably Go out binary and drive parameter or optimal binary drive scheme, realizes precisely comparison.This step represents each side of N sections of chemical flooding modes of analysis Case.

(1) experimental data of each scheme is counted and is made table, draw experimental result curve as shown in Figure 4；

8 binary combination flooding experimental result of table

(2) binary under comparative analysis difference binary drive scheme drives the increase rate of stage recovery percent of reserves；

From experimental result as can be seen that the binary combination flooding recovery percent of reserves in scheme ten is adopted than the binary combination flooding in scheme nine It is 1.59 percentage points high to go out degree.Therefore, the binary solution oil displacement efficiency containing petroleum sulfonate is preferable.

（3）Show that binary drives optimized parameter or optimal binary drives scheme.

The binary formula that this experiment preferably obtains is to divide polymer+0.3% petroleum sulfonate in 1200 mg/L, i.e., optimal Binary drive scheme be scheme ten.

Claims (5)

1. a kind of method of chemical flooding effect after poly- drive of accurate comparison, it is characterised in that：The practical mining site situation to be simulated of foundation, Waterflood recovery efficiency factor, that is, water drive stage recovery percent of reserves before polymer flooding is carried out according to mining site, to determine that the water drive of laboratory experiment is cut Only timing node；The stage recovery percent of reserves in laboratory experiment water drive stage carries out the stage recovery percent of reserves before polymer flooding with mining site Between error range need control between ± 0.01% so that in the laboratory in progress the polymer flooding stage experiment side When case compares, the remaining oil saturation in rock core is identical;Later, need to first pass through it is quantitative, become flow velocity experiment determination and reach mining site Reasonable injection rate when poly- drive stage recovery percent of reserves injects quantitative polymer with this preferred injection rate later, with This is identical as mining site actual stage recovery percent of reserves to control poly- drive stage recovery percent of reserves;Abovementioned steps will be passed through again later to complete Several blocks of rock cores of postpolymer flood carry out chemical flooding according to different contrast experiment's schemes;Finally, it compares in each experimental program Chemical flooding stage recovery percent of reserves increase rate preferably goes out chemical flooding parameter or optimal chemical flooding scheme, realizes precisely comparison.

2. the method for chemical flooding effect after the poly- drive of accurate comparison according to claim 1, it is characterised in that：This method includes Following steps,

The first step determines the trends exploitation feature of this mining site block according to mining site block to be simulated, according to this trends exploitation spy Sign determines water drive stage recovery percent of reserves and poly- drive recovery percent of reserves;The numerical value of the water drive stage recovery percent of reserves is expressed as A, with mining site Water drive stage recovery percent of reserves when water drive stage moisture content reaches 98% determines；Determine the geologic feature of the mining site block, institute It includes porosity, permeability, size distribution and gluing agent content to state geologic feature；

Second step prepares artificial core according to the mining site block geologic feature determined in the first step；

Third walks, and according to the poly- drive development situation of mining site block to be simulated and similar block, preferred polymer flooding is wanted in determination Parameter；

4th step filters out several blocks of rock cores from being prepared in second step in the rock core that finishes, the quantity of the rock core is B, to institute It states several blocks of rock cores and carries out Preparatory work of experiment, that is, distinguish evacuation, saturated water and saturated oils successively；

5th step, after what is determined in being walked according to third wants preferred parameters in polymer flooding to prepare poly- drive polymer solution and poly- drive Solution used when next step chemical flooding prepares injection water；

6th step connects displacement test device, starts to test；

7th step, water drive when water drive to mining site water drive stage moisture content reaches 98% respectively by the B blocks rock core obtained in the 4th step Stage recovery percent of reserves C, when C values are identical as the water drive stage recovery percent of reserves A values determined in the first step or error range is ± 0.01% Between when, the water drive stage stop；

8th step carries out polymer flooding to the completed B blocks rock core of water drive stage in the 7th step, during progress, with mining site reality The stage recovery percent of reserves in border polymer flooding stage is foundation, first part artificial core is used preferably to quantify polymer flooding under injection condition Optimal velocity, later, according to optimal velocity by remaining artificial core carry out polymer flooding, stop after displacement to design scheme Only；

The realization of this step is divided into two stages, respectively：

First stage, carry out that polymer is quantitative, speed change displacement test；

（1）Formulate polymer flooding experimental program：Each scheme polymer injection rate is constant, changes injection rate；

（2）It opens displacement pump and polymer corresponds to each valve of route, start to gather according to requirement of experiment setting displacement flow rate pump Object is closed to drive；

（3）According to the time interval record injection pressure in water drive stage, Produced Liquid oil pump capacity and water yield, and calculate moisture content and Stage recovery percent of reserves；

（4）According to the experimental procedure in this stage（1）The experimental program of middle formulation stops after injecting some amount under a certain velocity conditions Only polymer injection；Polymer flooding stage recovery percent of reserves numerical value in experiment with computing；

（5）D block rock cores in B block rock cores are repeated aforementioned（2）-（4）Step, the numerical value of B are more than the numerical value of D；

（6）By the polymer flooding stage recovery percent of reserves numerical value of the practical postpolymer flood in scene and the（4）The experiment obtained in step is poly- It closes object drive stage recovery percent of reserves numerical value to be compared, when error range is when between ± 0.01%, selection is driven with the experimental Polymer The corresponding experimental program of stage recovery percent of reserves numerical value is the optimization experiment scheme screened；

Second stage, the optimization experiment scheme filtered out according to the first stage are polymerize using B residue E block rock cores in the block Object drives phase experiments, determines polymer injection rate；This stage is as follows：

（1）It opens displacement pump and polymer corresponds to each valve of route, the optimization experiment scheme filtered out according to the first stage In injection rate setting displacement flow rate pump start polymer flooding；

（2）Injection pressure, Produced Liquid oil pump capacity and water yield are recorded at regular intervals, and calculate moisture content and stage extraction journey Degree；

（3）The optimization experiment scheme filtered out according to the first stage, stopping note is poly- after injecting certain quantifying polymers；

（4）Repeat the aforementioned of this stage（1）-（3）Remaining E blocks rock core in B block rock cores is completed polymer flooding experiment by step；

The E blocks rock core that postpolymer flood is completed in 8th step is carried out chemical flooding according to different contrast experiment's schemes, driven by the 9th step For to stopping after design scheme；

Tenth step compares the chemical flooding stage recovery percent of reserves increase rate in each contrast experiment's scheme of the 9th step, preferably goes out chemistry Parameter or optimal chemical flooding scheme are driven, realizes precisely comparison, the specific steps are；

（1）The experimental data of each scheme is counted and made table, draws experimental result curve；

（2）Comparative analysis difference chemical flooding parameter is such as the chemical flooding stage recovery percent of reserves under concentration, viscosity or chemical flooding scheme Increase rate；

（3）Obtain chemical flooding optimized parameter or optimal chemical flooding scheme.

3. the method for chemical flooding effect after the poly- drive of comparison according to claim 2, it is characterised in that：In 9th step Contrast experiment's scheme after poly- drive using only having a kind of chemical flooding mode, and steps are as follows for specific implementation：

（1）It opens displacement pump and chemical flooding corresponds to each valve of route, displacement flow rate pump beginning is set according to requirement of experiment It learns and drives；

（2）According to time interval record injection pressure, Produced Liquid, oil pump capacity and the water yield in water drive stage, and calculate moisture content With stage recovery percent of reserves.Judge whether Produced Liquid carries out demulsification processing according to chemical flooding mode.If desired it is demulsified, is produced in record Demulsifier is added in the forward direction test tube of liquid, oil pump capacity and water yield, turn on agitator carries out Produced Liquid demulsification later.To be mixed one Blender is closed after minute, each liquid volume is measured；The directly metering if it need not be demulsified；

（3）According to a certain amount of rear stopping chemical injection solution of requirement of experiment injection；

（4）If there is subsequent waterflooding in experimental program, the metaideophone water after stopping chemical injection solution, experimental program to be done are needed After terminate to test；

（5）It repeats aforementioned（1）-（4）E blocks rock core is completed to test by step according to experimental program.

4. the method for chemical flooding effect after the poly- drive of comparison according to claim 2, it is characterised in that：In 9th step Contrast experiment's scheme has N kind chemical flooding modes, N to be greater than or equal to 2, be then divided into three phases in accordance with the following steps after using poly- drive It realizes：

First stage：N-1 sections of chemical floodings are for the quantitative of stage, speed change displacement test；

（1）Formulate N-1 sections of chemical flooding phase experiments schemes：Each scheme chemical agent determines that injection rate is constant according to field condition, Change injection rate；

（2）Each valve that displacement pump and chemical agent correspond to route is opened, setting displacement flow rate pump according to requirement of experiment starts the N-1 sections of chemical floodings；

（3）According to the time interval record injection pressure in water drive stage, Produced Liquid oil pump capacity and water yield, and calculate moisture content and Stage recovery percent of reserves.Judge whether Produced Liquid carries out demulsification processing according to chemical flooding mode.If desired it is demulsified, is produced in record Demulsifier is added in the forward direction test tube of liquid, oil pump capacity and water yield, turn on agitator carries out Produced Liquid demulsification later.To be mixed one Blender is closed after minute, each liquid volume is measured；

（4）A certain amount of rear stopping is injected under the conditions of certain speed note the chemical solution according to requirement of experiment；

（5）It repeats aforementioned（2）-（4）Step, by the part F blocks rock core in E block rock cores according to the（1）Experimental program is walked to complete in fact It tests；

（6）The experiment side being consistent therewith is screened according to the chemical flooding stage recovery percent of reserves numerical value after the practical chemical flooding in scene Case, allowable error are ± 0.01%.

Second stage：According to the optimization experiment scheme of first stage, N-1 sections of chemical agent injection rates are determined.E is in the block surplus Remaining G blocks rock core carries out N-1 sections of chemical flooding phase experiments.

（1）It opens displacement pump and N-1 sections of chemical agents corresponds to each valve of route, set according to the injection rate of preferred embodiment Displacement flow rate pump starts N-1 sections of chemical floodings；

（2）Injection pressure, Produced Liquid oil pump capacity and water yield are recorded at regular intervals, and calculate moisture content and stage extraction journey Degree.Judge whether Produced Liquid carries out demulsification processing according to chemical flooding mode.If desired be demulsified, record Produced Liquid, oil pump capacity and Demulsifier is added in the forward direction test tube of water yield, turn on agitator carries out Produced Liquid demulsification later.It is closed after one minute to be mixed Blender measures each liquid volume；

（3）Stop injection after injecting a certain amount of N-1 chemical agents according to requirement of experiment；

（4）It repeats aforementioned（1）-（3）Remaining G blocks rock core in E block rock cores is completed N-1 sections of chemical flooding experiments by step；

Phase III：The aforementioned G block rock cores that N-1 sections of chemical floodings are finished after speed is preferred are subjected to N sections of chemical floodings, displacement is extremely Stop after design scheme.

（1）It opens displacement pump and N sections of chemical floodings corresponds to each valve of route, opened according to requirement of experiment setting displacement flow rate pump Begin N sections of chemical floodings；

（2）According to time interval record injection pressure, Produced Liquid, oil pump capacity and the water yield in water drive stage, and calculate moisture content With stage recovery percent of reserves.Judge whether Produced Liquid carries out demulsification processing according to chemical flooding mode.If desired it is demulsified, is produced in record Demulsifier is added in the forward direction test tube of liquid, oil pump capacity and water yield, turn on agitator carries out Produced Liquid demulsification later.To be mixed one Blender is closed after minute, each liquid volume is measured；

（3）According to a certain amount of rear stopping N sections of chemical solutions of note of requirement of experiment injection；

（4）If there is subsequent waterflooding in experimental program, the metaideophone water after stopping N sections of chemical solutions of note, reality to be done are needed Terminate experiment after proved recipe case.

（5）It repeats aforementioned（1）-（4）G blocks rock core is completed to test by step according to experimental program；

Wherein, E=G+F.

5. the device of chemical flooding effect after a kind of poly- drive of accurate comparison, including artificial core, displacement pump, pipeline, six logical, water filling work Fill in container, polymer injection piston container, chemical injection piston container, upper valve, lower part valve, pressure gauge, control valve, rock Heart clamp holder, common cable and heat-insulated cable, it is characterised in that：Described device further includes self-measuring device, insulating box, stirring Device and computer；

Wherein, the displacement pump is led to by pipeline and six connects, and described six cross pipeline all gathers with water filling piston container, note respectively Close the lower part valve connection of object piston container and chemical injection piston container；The water filling piston container and polymer injection piston The upper valve of container and chemical injection piston container is led to by pipeline and six to be connect；Described six logical upper connection pressure gauges, six It crosses pipeline all to connect with the control valve of left part on the core holding unit, the core holding unit includes artificial core, rock The control valve of heart clamp holder right part is connected by pipeline with the self-measuring device, and the self-measuring device, which is embedded with, to be stirred Device is mixed, and is connected with the computer by heat-insulated cable, the computer is connected by common cable with displacement pump；

The displacement pump to this driving device for providing power；Described six lead to and provide multiple accesses to driving device；The note Water piston container, polymer injection piston container and the molten device of chemical injection piston are for storing injection water, injection of polymer and note Enter the container of chemical agent；The pressure gauge is used to record the injection pressure of liquid；The artificial core is for simulating mining site block Physical property；

The self-measuring device is accepted through the Produced Liquid after rock core, can show current oil mass and liquid measure, and can will be above-mentioned Value is transferred to the computer；The blender being placed in the self-measuring device can be by the switch on self-measuring device Working order is controlled, blender rotates and carries out demulsification operation to Produced Liquid after unlatching；

The computer can calculate water drive rank under the control of built-in computer program by the saturation oil mass of artificial core Section recovery percent of reserves reaches extraction oil mass when certain value, when the calculating produces the current oil acquired in oil mass and self-measuring device When measuring consistent, computer can pass out the instruction for stopping fluid injection by common cable to displacement pump, and displacement pump is made to be stopped；Institute Practical water drive stage recovery percent of reserves can be obtained by stating after computer calculates extraction oil mass, when which reaches 98% with mining site moisture content Stage recovery percent of reserves between the error range that allows between ± 0.01%；

The insulating box is used to make the entire experiment flow of the present apparatus to keep at the formation temperature.