CN108179999A - Compare the method and apparatus in carbon dioxide-foam flooding displacement stage - Google Patents
Compare the method and apparatus in carbon dioxide-foam flooding displacement stage Download PDFInfo
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- CN108179999A CN108179999A CN201711491240.6A CN201711491240A CN108179999A CN 108179999 A CN108179999 A CN 108179999A CN 201711491240 A CN201711491240 A CN 201711491240A CN 108179999 A CN108179999 A CN 108179999A
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- carbon dioxide
- foam
- stage
- water drive
- reserves
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000006260 foam Substances 0.000 title claims description 136
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims description 63
- 229910052799 carbon Inorganic materials 0.000 title claims description 63
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 120
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 112
- 238000011084 recovery Methods 0.000 claims abstract description 63
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 60
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 60
- 238000005065 mining Methods 0.000 claims abstract description 44
- 238000002474 experimental method Methods 0.000 claims abstract description 34
- 238000004088 simulation Methods 0.000 claims abstract description 4
- 238000002347 injection Methods 0.000 claims description 54
- 239000007924 injection Substances 0.000 claims description 54
- 229910000831 Steel Inorganic materials 0.000 claims description 42
- 239000010959 steel Substances 0.000 claims description 42
- 239000003921 oil Substances 0.000 claims description 40
- 239000011435 rock Substances 0.000 claims description 40
- 239000000243 solution Substances 0.000 claims description 25
- 238000012360 testing method Methods 0.000 claims description 22
- 238000011049 filling Methods 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 14
- 230000035699 permeability Effects 0.000 claims description 13
- 239000004088 foaming agent Substances 0.000 claims description 12
- 229920006395 saturated elastomer Polymers 0.000 claims description 12
- 238000000605 extraction Methods 0.000 claims description 10
- 238000005086 pumping Methods 0.000 claims description 10
- 230000015572 biosynthetic process Effects 0.000 claims description 9
- 238000011161 development Methods 0.000 claims description 9
- 238000009826 distribution Methods 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 238000004026 adhesive bonding Methods 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 4
- 230000000704 physical effect Effects 0.000 claims description 4
- 238000004590 computer program Methods 0.000 claims description 2
- 239000004408 titanium dioxide Substances 0.000 claims description 2
- 238000005187 foaming Methods 0.000 abstract description 11
- 238000009533 lab test Methods 0.000 abstract description 7
- 229960004424 carbon dioxide Drugs 0.000 description 40
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 16
- 239000000463 material Substances 0.000 description 9
- 239000006004 Quartz sand Substances 0.000 description 8
- 238000003825 pressing Methods 0.000 description 8
- 239000004576 sand Substances 0.000 description 8
- 238000005520 cutting process Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 241000790917 Dioxys <bee> Species 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000004520 agglutination Effects 0.000 description 2
- 238000010835 comparative analysis Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 1
- 241000238590 Ostracoda Species 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
- 239000002349 well water Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—Injecting CO2 or carbonated water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/235—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids for making foam
- B01F23/2351—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids for making foam using driven stirrers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
Landscapes
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
Compare the method and apparatus that carbon dioxide foaming drives the displacement stage.It is characterized in that：According to the mining site situation for being actually subjected to simulation, waterflood recovery efficiency factor, that is, water drive stage recovery percent of reserves before carbon dioxide foaming drive is carried out according to mining site, to determine the water drive deadline node of laboratory experiment；In the contrast experiment's scheme for carrying out carbon dioxide foaming drive, the stage recovery percent of reserves error range in water drive stage needs to control between ± 0.01%, so that in laboratory carry out water drive on the basis of, carbon dioxide foaming drive the stage start before remaining oil saturation be consistent;Later, the contrast experiment of carbon dioxide foaming drive is carried out, stage recovery percent of reserves increase rate is driven according to the carbon dioxide foaming in each contrast experiment, preferably goes out carbon dioxide foaming and drives parameter or optimal carbon dioxide foaming drive scheme, realize effectively comparison.
Description
Technical field
The present invention is under the jurisdiction of oil-gas field development field, particularly with regard to the accurate comparison dioxy improved in recovery efficiency technique
Change the method and apparatus in carbon-foam flooding displacement stage.
Background technology
In hypotonic, ultra-low permeability oil layer, to be separately injected into carbon dioxide easy because it can effectively overcome for carbon dioxide-foam flooding
Fingering is led to the problem of, and with preferable oil displacement efficiency.Carbon dioxide-foam flooding can improve note when applying at the scene and adopt pressure
Difference effectively blocks has channeling channel, gas entry profile is made significantly to be adjusted.Mining site is considered when application carbon dioxide foaming drives
Economic benefit, it is preferred first to carry out slug indoors, carries out field test later.Therefore whether laboratory experiment data have accurate
Property and science directly affect its can to field application provide instruct foundation.
According to field condition, it also needs to carry out water drive before carbon dioxide-foam flooding is carried out.At present in preferred water drive rank
During section displacement parameter, laboratory experiment carries out always according to the experimental program at scene, many problems often occurs.Field test scheme
For constant pressure water drive to moisture content 98%, carbon dioxide-foam flooding of certain PV numbers is then carried out, then carries out subsequent waterflooding.Work as mining site
Between the waterflood recovery efficiency factor of general low-permeability sandstone oil reservoir is about 20%-30% when testing program is water drive to moisture content 98%, pressure drop
Width is little, and rate of water cut increase is slow during field test water drive, and moisture content rises rapidly after producing well water breakthrough and breaking through.It is indoor real
Scheme i.e. water drive according to field test is tested to moisture content 98%, it is found that the completely different situation with mining site.Firstth, containing waterborne
Lifting speed is significantly larger than mining site；Secondth, waterflood recovery efficiency factor is significantly larger than field test；Barometric gradient and reality between third, injection-production well
Border mining site is completely different, declines by a big margin.Although occur the result is that laboratory experiment fully according to field test scheme carry out,
But other than water drive stage moisture content when displacement ends is consistent with practical mining site, remaining all key parameter such as water drive stage
Recovery percent of reserves, rate of water cut increase, the barometric gradient range of decrease are different from mining site.In addition, the physical model one used in laboratory experiment
As for artificial core, simulation scale is small, big with actual reservoir difference.
If according to above routine experiment method, remaining oil saturation of each physical model after water drive has very big difference
It is different, if continuing carbon dioxide injection-foam 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, i.e.,
Most important factor is only caught in the water drive stage：Stage recovery percent of reserves.According to be actually subjected to simulation mining site situation, according to mining site into
Waterflood recovery efficiency factor, that is, water drive stage recovery percent of reserves before row carbon dioxide-foam flooding, to determine that the water drive of laboratory experiment is ended
Timing node；In the contrast experiment's scheme for carrying out carbon dioxide-foam flooding, the stage recovery percent of reserves error range in water drive stage
Control is needed between ± 0.01%, so that on the basis of carrying out water drive in laboratory, carbon dioxide-foam flooding stage
Remaining oil saturation before beginning is consistent;Later, the contrast experiment of carbon dioxide-foam flooding is carried out, it is real according to each comparison
Carbon dioxide-foam flooding stage recovery percent of reserves increase rate in testing, preferably goes out carbon dioxide-foam flooding parameter or optimal dioxy
Change carbon-foam flooding scheme, realize effectively comparison.
The technical scheme is that：The method that this kind compares carbon dioxide-foam flooding displacement stage, including walking as follows
Suddenly,
The first step determines the trends exploitation feature of this mining site block according to the mining site block to be simulated, according to this trends exploitation spy
Sign determines water drive stage recovery percent of reserves;The numerical value of the water drive stage recovery percent of reserves is expressed as A, is reached with mining site water drive stage moisture content
Water drive stage recovery percent of reserves during to 98% determines；Determine the geologic feature of the mining site block, the geologic feature includes hole
Porosity, permeability, block size distribution, gluing agent content and formation fracture pressure；
Second step prepares artificial core according to the mining site block geologic feature determined in the first step；
Third walks, and according to mining site situation and the carbon dioxide flooding development situation of similar block, determines the carbon dioxide to be injected
The type of parameter and foaming agent；
4th step prepares from second step and several blocks of rock cores is filtered out in the rock core finished, and 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, the carbon dioxide parameter determined in being walked according to third determine the purity of experiment carbon dioxide and injection pressure
Carbon dioxide is packed into carbon dioxide injection piston container, according to certain mass ratio foaming agent is configured to expanding foam solution, and be packed by power
Expanding foam solution piston container is noted, prepare injection water and is loaded into water filling piston container；
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 with the water drive stage recovery percent of reserves A value determined in the first step or error range is ± 0.01%
Between when, the water drive stage stop；
8th step, to water drive stage completed B blocks rock core in the 7th step according to carbon dioxide-foam flooding contrast design scheme into
Row carbon dioxide-foam flooding stage displacement, displacement to designing scheme stop；
9th step compares carbon dioxide-foam flooding stage recovery percent of reserves increase rate in the 8th each contrast experiment of step, preferably goes out
Carbon dioxide-foam flooding parameter or optimal carbon dioxide-foam flooding scheme realize effectively comparison.
In order to implement the above method, driving device is given below.This kind compares the dress in carbon dioxide-foam flooding displacement stage
It puts, including artificial core, high pressure displacement pump, steel pipeline, six logical, water filling piston container, carbon dioxide injection piston container, note foaming
Liquid piston container, upper valve, lower part valve, pressure gauge, control valve, core holding unit, common cable and heat-insulated cable,
It is characterized in that：Described device further include foam maker, self-measuring device, insulating box, blender and computer, high pressure observation window,
Back-pressure valve, gas mass flow controller and gas gauge；
The foam maker has arrival end and the port of export and observation window, and nozzle and pumping velocity setting are built-in in foam maker
Device；
Wherein, high pressure displacement pump is led to by steel pipeline and six connects, six cross all steel pipeline respectively with water filling piston container,
The lower part valve connection of carbon dioxide injection piston container, the upper valve of water filling piston container is led to by steel pipeline and six to be connect,
Carbon dioxide injection piston upper vessel portion is connected with gas mass flow controller, gas mass flow controller by steel pipeline and
Foam maker connects；High pressure displacement pump is connected by steel pipeline with the lower part valve of note expanding foam solution piston container, notes expanding foam solution piston
The upper valve of container is connected by steel pipeline with foam maker；Foam maker lower part is led to by steel pipeline and six to be connect, six it is logical on connect
Pressure gauge is connect, six cross steel pipeline all connects with the control valve of left part on core holding unit, the control of core holding unit right part
Valve is connected by steel pipeline with high pressure observation window, and high pressure observation window is connected by steel pipeline with back-pressure valve, and back-pressure valve passes through steel
Pipeline is connected with self-measuring device, and self-measuring device one end is connected by steel pipeline with gas gauge, and self-measuring device is another
One end is connected by heat-insulated cable with computer, and computer is connected by common cable with high pressure displacement pump；
The high pressure displacement is pumped provides power to entire driving device, and rated operating pressure is not less than 50MPa；Described six lead to for dress
It puts and multiple accesses is provided；The water filling piston container, carbon dioxide injection piston container and note expanding foam solution piston container be injection water,
It injects carbon dioxide and notes the container of expanding foam solution, maximum pressure-bearing is 50MPa；
For controlling gas flow, pressure-resistant 40MPa, range of flow 0-50mL/min flow the gas mass flow controller
Amount and high pressure displacement pump displacement velocity are consistent；
The nozzle and blender set in the foam maker, for coming into full contact with foaming agent and carbon dioxide, so as to generate bubble
Foam；Suction pump is built-in in the foam maker, for foam to be discharged into follow-up steel pipeline, pumping velocity is set with displacement flow rate pump
It puts consistent；The pressure gauge is used to record the injection pressure of liquid；
The artificial core is the model close with mining site block physical property；The high pressure observation window rated operating pressure is not less than
50MPa, for observing the phase of production end fluid；The back-pressure valve ensures entire injection device for controlling extraction end pressure
In pressure stability；The self-measuring device accepts Produced Liquid, can show current oil mass and liquid measure, and can pass above-mentioned value
It is defeated by the computer；The gas gauge is used to measure the volume of produced gas；
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 during 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 high pressure displacement pump, stop high pressure displacement pump
Only work；The computer can obtain practical water drive stage recovery percent of reserves, the numerical value and mining site moisture content after calculating extraction oil mass
The error range allowed between stage recovery percent of reserves when reaching 98% is between ± 0.01%；
The insulating box makes entire experiment flow 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, ensures that the remaining oil saturation in carbon dioxide-foam flooding stage rock core is consistent, can ensure dioxy in this way
Changing carbon-foam flooding stage has striking contrast.Carbon dioxide-froth phase carries out comparison displacement reality according to comparison scheme
It tests, finally carries out carbon dioxide-foam flooding stage Flooding Efficiency comparison, the present invention is by this method, it can be ensured that titanium dioxide
Carbon-foam flooding stage effectively precisely compares, it can be ensured that preferably goes out really effective carbon dioxide-foam flooding parameter or scheme.
Description of the drawings：
Fig. 1 is compacting tool set schematic diagram.
Fig. 2 is the structure diagram of experiment artificial core.
Fig. 3 is the composition connection diagram of device of the present invention.
Fig. 4 is the structure diagram of foam maker of the present invention.
Fig. 5 is each scheme injection PV numbers-recovery ratio graph of relation in the specific embodiment 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- high pressures in figure
Displacement pump, 9- steel pipelines, 10- six lead to, 11- water filling pistons container, 12- carbon dioxide injection pistons container, 13- note expanding foam solution piston
Container, 14- foam makers, 15- upper valves, 16- lower parts valve, 17- gas mass flow controllers, 18- pressure gauges, 19- controls
Valve processed, 20- core holding units, 21- high pressure observation windows, 22- back-pressure valves, 21- self-measuring devices, 24- gas gauges, 25- are permanent
Incubator, the heat-insulated cables of 26-, 27- common cables, 28- computers, 29- arrival ends, 30- nozzles, 31- blenders, 32- outlets
End, 33- pumping velocity setters, 34- observation windows.
Specific embodiment：
The invention will be further described below in conjunction with the accompanying drawings：
In the following, the specific implementation step of the present invention is provided first.
Inventive step one：It determines the mining site block to be simulated, determines the parameters such as representative porosity, permeability,
Determine block size distribution, gluing agent content and formation fracture pressure.The water drive stage is determined according to the block trends exploitation feature
Recovery percent of reserves A；
（1）According to block Use of Geophysical Data determine the porosity of rock in reservoir, permeability, size distribution, gluing agent content and
Formation fracture pressure；
（2）According to the production development data of each water injection well of block and producing well, obtain block and reach in water drive stage moisture content
Water drive stage recovery percent of reserves when 98%.
Inventive step two：Artificial core is prepared according to actual reservoir situation, size is length（More than or equal to 60cm）* it is 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 pass through fixed link and fix.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 consistent for 1-1.5cm 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；
The quartzy Grains according to used in the parameters such as the porosity of block, permeability, size distribution, gluing agent content determine physical model
Number and quality.
（3）It is die-filling to rub sand with the hands；
The quartz sand for determining mesh number quality with a certain amount of epoxy resin is mixed, 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 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 carbon dioxide flooding development situation of similar block, determine what is injected
Carbon dioxide parameter, the type of foaming agent screen enough rock core B blocks, carry out Preparatory work of experiment, evacuation, saturated water, saturated oils,
Connect experimental facilities；
（1）According to mining site situation, determine the purity of experiment carbon dioxide and injection pressure, determine foaming agent type；
（2）According to block real permeability, the artificial core made in inventive step two is screened, selects satisfactory artificial rock
Heart B blocks；
（3）Experiment is evacuated with artificial core, saturated water, saturated oils；
（4）Carbon dioxide is packed into carbon dioxide injection piston container, foaming agent is configured to expanding foam solution according to certain mass ratio, and
Note expanding foam solution piston container is packed into, prepare injection water and is loaded into water filling piston container；
（5）Experimental provision is connected, preparation starts to test.Experimental provision connection figure is as shown in figure 3, foam maker is as shown in Figure 4.
High pressure displacement pump 8（1）Led to by steel pipeline and six and connect, six all cross steel pipeline respectively with water filling piston container,
The lower part valve connection of carbon dioxide injection piston container, the upper valve of water filling piston container is led to by steel pipeline and six to be connect,
Carbon dioxide injection piston upper vessel portion is connected with gas mass flow controller, gas mass flow controller by steel pipeline and
Foam maker connects.High pressure displacement pump 8（2）It is connected by steel pipeline with the lower part valve of note expanding foam solution piston container, notes expanding foam solution
The upper valve of piston container is connected by steel pipeline with foam maker.Foam maker lower part is led to by steel pipeline and six to be connect, and six is logical
On be connected with pressure gauge, six cross steel pipeline all connects with the control valve of left part on core holding unit, core holding unit right part
Control valve connected by steel pipeline with high pressure observation window, high pressure observation window is connected by steel pipeline with back-pressure valve, back-pressure valve
It is connected by steel pipeline with self-measuring device, self-measuring device one end is connected by steel pipeline with gas gauge, automatic gauge
The device other end is connected by heat-insulated cable with computer, and computer is connected by common cable with high pressure displacement pump.
The high pressure displacement is pumped provides power to entire driving device, and rated operating pressure is not less than 50MPa.
Described six lead to and provide multiple accesses for device.
The water filling piston container, carbon dioxide injection piston container and note expanding foam solution piston container are injection water, injection two
Carbonoxide and the container for noting expanding foam solution, maximum pressure-bearing is 50MPa.
The gas mass flow controller can control gas flow, pressure-resistant 40MPa, 0 ~ 50mL/min of range of flow,
Its flow and high pressure displacement pump displacement velocity are consistent.
Nozzle and blender are provided in the foam maker, can come into full contact with foaming agent and carbon dioxide, so as to produce
Raw foam, and suction pump is built-in with, its interior foam follow-up steel pipeline be can be discharged into, generally its pumping velocity and displacement pump flowed
Speed setting is consistent.Its interior foam production quantity is observed by top observation window, when in the observation window in foam maker it can be seen that foam
When, illustrate to fill with foam in it.
The injection pressure of the pressure gauge record liquid.
The artificial core is the model close with mining site block physical property.
The high pressure observation window rated operating pressure is not less than 50MPa, the phase of observable production end fluid.
The back-pressure valve can control extraction end pressure, ensure the pressure stability in entire injection device.
The self-measuring device accepts Produced Liquid, can show current oil mass and liquid measure, and can be transferred to above-mentioned value
Computer.
The gas gauge can measure the volume of produced gas.
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 high pressure displacement pump, stop high pressure displacement pump
Only work.
The insulating box makes entire experiment flow keep at the formation temperature.
Inventive step four：Rock core water drive during B blocks are tested is extremely identical with mining site recovery percent of reserves, and the water drive stage stops；
Displacement test step is as follows：
（1）High pressure displacement flow rate pump is set, starts displacement test；
（2）First for 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：According to carbon dioxide-foam flooding contrast design scheme to above-mentioned B blocks rock core carry out carbon dioxide-
The displacement of foam flooding stage, displacement to designing scheme stop；
On the basis of the four water drive stage of inventive step completes, next step carbon dioxide-foam flooding is carried out to artificial core model.
Step is as follows：
（1）High pressure displacement pump 1 and 2 is opened, identical flow velocity is set, opens note expanding foam solution piston container, carbon dioxide injection piston holds
Foam maker pumping velocity is set as 0, opens foam maker blender by the correspondence access of device.When can in the observation window in foam maker
It is during seeing foam, foam maker pumping velocity is consistent with the setting of displacement pump speed, and the valve of follow-up corresponding line is opened, it opens
Beginning carbon dioxide-foam flooding；
（2）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；
（3）According to a certain amount of rear stopping carbon dioxide injection-foam of requirement of experiment injection；
（4）If there is subsequent waterflooding in experimental program, the metaideophone water after carbon dioxide injection-foam is stopped, experiment to be done are needed
Terminate experiment after scheme.
（5）It repeats aforementioned（1）-（4）B blocks rock core is completed to test by step according to experimental program.
Inventive step six：Carbon dioxide-foam flooding stage recovery percent of reserves increase rate in inventive step five is compared, preferably
Go out carbon dioxide-foam flooding parameter or optimal carbon dioxide-foam flooding scheme, realize effectively comparison.
（1）The experimental data of each scheme is counted and makes table, and draws experimental result curve；
（2）Comparative analysis difference carbon dioxide-foam flooding parameter such as inject pressure, injection rate, injection carbon dioxide purity or
The increase rate of carbon dioxide flooding-froth phase recovery percent of reserves under carbon dioxide-foam flooding scheme；
（3）Obtain carbon dioxide-foam flooding optimized parameter or optimal carbon dioxide-foam flooding scheme.
A specific embodiments of the present invention are given below.
Certain oil field F blocks, reservoir is based on sandstone, average effective caliper 3.4m, and physical property is poor, and mean permeability is
21md, rock porosity is 17.8% or so in layer, formation fracture pressure 25MPa.Based on fine sand, median grain diameter exists grade
Between 0.06~0.11mm, sorting is preferable.Sand grains psephicity is general, and based on argillaceous agglutination, cementation type is contact glue
Knot.In layer of sand development have calcareous band, inside contain Ostracods, oil-bearing occurrence is single.Oil-containing, oil immersion occupy this
Oil sheet and off-balancesheet layer.Block moisture content after waterflooding development 30 years reaches 98%, and water drive stage recovery percent of reserves is 22.7%.Under
One step plan carries out carbon dioxide-foam flooding, further Remaining Oil.
Now using the oil field actual conditions as foundation, each step content for illustrating the present invention：
Step 1：It determines the mining site block to be simulated, determines the parameters such as representative porosity, permeability, determine block
Size distribution, gluing agent content and formation fracture pressure.Water drive stage recovery percent of reserves is determined according to the block trends exploitation feature
A；
（1）The porosity of the analog block is 17.8%, mean permeability 21md, based on fine sand, median grain diameter 0.06~
Between 0.11mm, sorting is preferable.Sand grains psephicity is general, and based on argillaceous agglutination, cementation type is cementing for contact, stratum
Fracture pressure is 25MPa.
（2）It is 22.7% to obtain water drive stage recovery percent of reserves according to waterflooding development dynamic data.
Step 2：It is prepared according to actual reservoir situation（7）Artificial core, size are length 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；
The length for choosing long side plate is 65cm, width 1cm, is highly 13.5cm.The length for choosing short side plate is 30.5cm, wide
It spends for 1cm, is highly 13.5cm.The length for choosing pedestal is 70cm, width 36cm, is highly 1.2cm.Choose the length of pressing plate
It spends for 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.
When to be pressed, pressing plate is placed in above material.
（2）Prepare material；
Choose 50 mesh quartz sand 6946g, 80 mesh quartz sand 3834g, 270 mesh quartz sand 1148g, 340 mesh quartz sand 234g.
（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 1449g, alcohol 2g, ethylenediamine 104g after mixing,
Compacting tool set is packed into, and struck off with sieve plate after quartz sand particle is uniformly cementing.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, sets pressure 10MPa, is persistently suppressed 30 minutes.Completion to be pressed
After 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 according to required size is cut with cutting machine, obtains 4 blocks of exposed rock cores met the size requirements.
Step 3：According to mining site situation and the carbon dioxide flooding development situation of similar block, the dioxy to be injected is determined
Change carbon parameter, the type of foaming agent screens 4 pieces of enough rock cores, carries out Preparatory work of experiment, evacuation, saturated water, saturated oils, connection
Experimental facilities；
（1）According to mining site situation, the purity for determining experiment carbon dioxide is 98.8%, and injection pressure is 21MPa, foaming used
Agent is neopelex；
（2）According to block real permeability, the artificial core made in inventive step two is screened, selects satisfactory artificial rock
4 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) |
| 171212A-1 | 60.12 | 19.71 | 21 |
| 171212A-2 | 60.12 | 19.71 | 20 |
| 171212A-3 | 60.13 | 19.71 | 21 |
| 171212A-4 | 60.12 | 19.71 | 20 |
（3）Experiment is evacuated with artificial core, saturated water, saturated oils；
（4）Carbon dioxide is packed into carbon dioxide injection piston container, foaming agent is configured to expanding foam solution according to 0.3wt%, is packed into note
Expanding foam solution piston container prepares injection water and is loaded into water filling piston container；
（5）Experimental provision is connected, preparation starts to test.
Step 4：By the rock core water drive in 4 pieces of experiments to, water drive stage stopping identical with mining site recovery percent of reserves；
Displacement test step is as follows：
（1）Setting（8）High pressure 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 was recorded every 30 minutes
With water yield, and moisture content and stage recovery percent of reserves are calculated；
（3）Water drive stage recovery percent of reserves 22.7% when reaching 98% with mining site water drive stage moisture content works as experiment for basis for estimation
When water drive stage recovery percent of reserves in the process is 22.7%, displacement pump exists（28）It can be automatically stopped under the manipulation of computer, water drive rank
The recovery percent of reserves numerical value of section and 22.7% error range are 0.01%；
（4）It repeats aforementioned（1）-（3）4 blocks of rock cores are finished water drive experiment by step.
Step 5：Carbon dioxide-foam is carried out to above-mentioned 4 blocks of rock cores according to carbon dioxide-foam flooding contrast design scheme
The displacement of drive stage, displacement to designing scheme stop；
Experimental program is as follows：
2 experimental program of table
On the basis of the step 4 water drive stage completes, next step carbon dioxide-foam flooding is carried out to artificial core model.Step
It is as follows：
（1）Open high pressure displacement pump（1）、（2）, flow velocity 0.5mL/min, pressure 21MPa.Note expanding foam solution piston is opened to hold
The flow velocity of gas mass flow controller is set as 0.5mL/min by the correspondence access of device, carbon dioxide injection piston container, will
Foam maker pumping velocity is set as 0, opens foam maker blender and carries out blistering preparation.When can be seen in the observation window in foam maker
During to foam, foam maker pumping velocity and high pressure displacement pump speed are disposed as 0.2mL/min, and open follow-up corresponding line
Valve, start carbon dioxide-foam flooding；
（2）Injection pressure, Produced Liquid oil pump capacity and water yield are recorded, and calculate moisture content and stage recovery percent of reserves every 30min；
（3）Stop carbon dioxide injection-foam after injecting 0.2PV according to requirement of experiment；
（4）According to experimental program after carbon dioxide injection-foam is stopped metaideophone water, terminate experiment after experimental program to be done.
（5）Respectively according to table 2 shown in each conceptual design it is identical injection pressure under inject carbon dioxide-foam, repeat
It is aforementioned（1）-（4）Remaining 3 blocks of rock cores are completed to test by step according to experimental program.
Step 6：Carbon dioxide-foam flooding stage recovery percent of reserves increase rate in inventive step five is compared, preferably goes out two
Carbonoxide-foam flooding parameter or optimal carbon dioxide-foam flooding scheme realize precisely comparison.
（1）The experimental data of each scheme is counted and makes table, and draws injection PV numbers-recovery ratio as shown in Figure 5
Curve；
3 different schemes experimental result table of table
（2）Comparative analysis difference carbon dioxide-foam flooding parameter such as inject pressure, injection rate, injection carbon dioxide purity or
The increase rate of carbon dioxide flooding stage recovery percent of reserves under carbon dioxide-foam flooding scheme；
From different schemes experimental result table it is found that in carbon dioxide-foam flooding stage, scheme two is produced than the stage of scheme one
Degree improves 2.32 percentage points, and scheme three improves 1.79 percentage points than the stage recovery percent of reserves of scheme two, scheme four
1.7 percentage points are improved than three stage of scheme recovery percent of reserves.PV numbers are injected more than after 0.3PV, and recovery ratio ascensional range is gradual
It tends towards stability.So when it is 0.3PV to inject PV numbers, injection carbon dioxide-foam can save throwing while recovery ratio is improved
Enter cost, good economic benefit can be obtained.
（3）Obtain carbon dioxide-foam flooding optimized parameter or optimal carbon dioxide-foam flooding scheme.
Under the experiment condition, the optimal injection slug of carbon dioxide-foam flooding is 0.3PV, i.e., scheme two is optimal two
Carbonoxide-foam flooding scheme.
Claims (3)
- A kind of 1. method for comparing carbon dioxide-foam flooding displacement stage, it is characterised in that：According to the mining site feelings for being actually subjected to simulation Condition carries out waterflood recovery efficiency factor, that is, water drive stage recovery percent of reserves before carbon dioxide-foam flooding according to mining site, indoor real to determine The water drive deadline node tested；In the contrast experiment's scheme for carrying out carbon dioxide-foam flooding, the stage extraction in water drive stage Degree error range needs to control between ± 0.01%, so that on the basis of carrying out water drive in laboratory, titanium dioxide Carbon-foam flooding stage start before remaining oil saturation be consistent;Later, the comparison for carrying out carbon dioxide-foam flooding is real It tests, according to the carbon dioxide in each contrast experiment-foam flooding stage recovery percent of reserves increase rate, preferably goes out carbon dioxide-foam Parameter or optimal carbon dioxide-foam flooding scheme are driven, realizes effectively comparison.
- 2. the method in comparison carbon dioxide-foam flooding displacement stage according to claim 1, it is characterised in that：This method Include the following steps,The first step determines the trends exploitation feature of this mining site block according to the mining site block to be simulated, according to this trends exploitation spy Sign determines water drive stage recovery percent of reserves;The numerical value of the water drive stage recovery percent of reserves is expressed as A, is reached with mining site water drive stage moisture content Water drive stage recovery percent of reserves during to 98% determines；Determine the geologic feature of the mining site block, the ground of the mining site block Matter feature includes porosity, permeability, block size distribution, gluing agent content and formation fracture pressure；Second step prepares artificial core according to the geologic feature of the mining site block determined in the first step；Third walks, and according to mining site situation and the carbon dioxide flooding development situation of similar block, determines the carbon dioxide to be injected The type of parameter and foaming agent；4th step prepares from second step and several blocks of rock cores is filtered out in the rock core finished, and 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, the carbon dioxide parameter determined in being walked according to third determine the purity of experiment carbon dioxide and injection pressure Carbon dioxide is packed into carbon dioxide injection piston container, according to certain mass ratio foaming agent is configured to expanding foam solution, and be packed by power Expanding foam solution piston container is noted, prepare injection water and is loaded into water filling piston container；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 with the water drive stage recovery percent of reserves A value determined in the first step or error range is ± 0.01% Between when, the water drive stage stop；8th step, to water drive stage completed B blocks rock core in the 7th step according to carbon dioxide-foam flooding contrast design scheme into Row carbon dioxide-foam flooding stage displacement, displacement to designing scheme stop；9th step compares carbon dioxide-foam flooding stage recovery percent of reserves increase rate in the 8th each contrast experiment of step, preferably goes out Carbon dioxide-foam flooding parameter or optimal carbon dioxide-foam flooding scheme realize effectively comparison.
- 3. a kind of device for comparing carbon dioxide-foam flooding displacement stage, including artificial core, high pressure displacement pump, steel pipeline, six Logical, water filling piston container, carbon dioxide injection piston container, note expanding foam solution piston container, upper valve, lower part valve, pressure gauge, Control valve, core holding unit, common cable and heat-insulated cable, it is characterised in that：Described device further includes foam maker, automatic meter Measure device, insulating box, blender and computer, high pressure observation window, back-pressure valve, gas mass flow controller and gas gauge；The foam maker has arrival end and the port of export and observation window, and nozzle and pumping velocity setting are built-in in foam maker Device；Wherein, high pressure displacement pump is led to by steel pipeline and six connects, six cross all steel pipeline respectively with water filling piston container, The lower part valve connection of carbon dioxide injection piston container, the upper valve of water filling piston container is led to by steel pipeline and six to be connect, Carbon dioxide injection piston upper vessel portion is connected with gas mass flow controller, gas mass flow controller by steel pipeline and Foam maker connects；High pressure displacement pump is connected by steel pipeline with the lower part valve of note expanding foam solution piston container, notes expanding foam solution piston The upper valve of container is connected by steel pipeline with foam maker；Foam maker lower part is led to by steel pipeline and six to be connect, six it is logical on connect Pressure gauge is connect, six cross steel pipeline all connects with the control valve of left part on core holding unit, the control of core holding unit right part Valve is connected by steel pipeline with high pressure observation window, and high pressure observation window is connected by steel pipeline with back-pressure valve, and back-pressure valve passes through steel Pipeline is connected with self-measuring device, and self-measuring device one end is connected by steel pipeline with gas gauge, and self-measuring device is another One end is connected by heat-insulated cable with computer, and computer is connected by common cable with high pressure displacement pump；The high pressure displacement is pumped provides power to entire driving device, and rated operating pressure is not less than 50MPa；Described six lead to for dress It puts and multiple accesses is provided；The water filling piston container, carbon dioxide injection piston container and note expanding foam solution piston container be injection water, It injects carbon dioxide and notes the container of expanding foam solution, maximum pressure-bearing is 50MPa；For controlling gas flow, pressure-resistant 40MPa, range of flow 0-50mL/min flow the gas mass flow controller Amount and high pressure displacement pump displacement velocity are consistent；The nozzle and blender set in the foam maker, for coming into full contact with foaming agent and carbon dioxide, so as to generate bubble Foam；Suction pump is built-in in the foam maker, for foam to be discharged into follow-up steel pipeline, pumping velocity is set with displacement flow rate pump It puts consistent；The pressure gauge is used to record the injection pressure of liquid；The artificial core is the model close with mining site block physical property；The high pressure observation window rated operating pressure is not less than 50MPa, for observing the phase of production end fluid；The back-pressure valve ensures entire injection device for controlling extraction end pressure In pressure stability；The self-measuring device accepts Produced Liquid, can show current oil mass and liquid measure, and can pass above-mentioned value It is defeated by the computer；The gas gauge is used to measure the volume of produced gas；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 during 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 high pressure displacement pump, stop high pressure displacement pump Only work；The computer can obtain practical water drive stage recovery percent of reserves, the numerical value and mining site moisture content after calculating extraction oil mass The error range allowed between stage recovery percent of reserves when reaching 98% is between ± 0.01%；The insulating box makes entire experiment flow keep at the formation temperature.
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Application publication date: 20180619 |