CN102121913B - Detection method for foam stability in porous medium and special device thereof - Google Patents
Detection method for foam stability in porous medium and special device thereof Download PDFInfo
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Abstract
The invention discloses a detection method for the foam stability in a porous medium and a special device thereof. The detection device comprises a porous medium simulating device and a resistance test device which is used for detecting resistance between paired electrodes in the porous medium simulating device. The porous medium simulating device comprises a column casing used for accommodating a porous medium and foams, and the paired electrodes which are inserted into different parts on the column casing wall. Through the detection device for the foam stability and by an evaluation method, the characteristics of the foams in porous media with different sizes and structures can be detected. The device and the method are particularly suitable for foam stability evaluation in foam acidification, foam fracturing, foam section adjusting, foam water plugging and foam oil displacement processes in petroleum and natural gas development and recovery ratio improving processes.
Description
Technical field
The present invention relates to a kind of pick-up unit and using method thereof of foam stability, particularly a kind of pick-up unit for foam stability in porous medium and using method thereof.
Background technology
The stability of foam system in porous medium of using is often paid close attention in the oil-gas field development field.The method of assess foam stability has improved Bikerman method, Ross-Miles method and Waring-Blender method at present.
Its main operational steps and method for expressing are as follows:
1) improved Bikerman method: be that pouring into the 100mL surfactant solution high is that in the glass column of 50cm, the internal diameter of glass column is 2.5cm.Gas produces foam with constant flow velocity by a glass sintering filter plate.Flow while reaching balance, the foam height of stable state is the distance that foam arrives foam and solution interface.After stopping passing into gas, measuring the initial foam volume of frothing agent to half time of initial foam volume is half foam life period.The stability of foam means with half foam life period.
2) ROSS-Miles method: the method is that China's commodity and chemical products foam detect and standard method.Adopt 2152 Luo Shi foam meter (GB/T7162-94; IS0696-75), at first foam meter is vertically placed, pipe clamp is overlapped to the temperature stabilization of water-bath at 40 ℃ ± 0.5 ℃.With minim pipette, inject 50mL test solution to this test solution of 50mL scale place and be heated in advance 40 ℃.Minim pipette is filled with to the 200mL test solution, and this test solution is heated to 40 ℃ in advance.Minim pipette is arranged on prior ready pipe support and is vertical configuration with the section of graduated tube, make solution flow to the center of graduated tube, the outlet of minim pipette should be placed on the 900mm scale mark.Open the piston of minim pipette, make under flow of solution.When the flow of solution in minim pipette is complete, starts immediately stopwatch, and measure foam height.By recording the height of different time foam, obtain the half life period of foam simultaneously, be used for characterizing the stability of foam.
3) Waring-Blender method: be the foaming agent solution that adopts certain volume, join in Waring-Blender, under certain rotating speed and time conditions, stir and produce foam.Then foam is transferred to and is with in graduated graduated cylinder, record different time, the variation of graduated cylinder inner foam volume, obtain half life period of foam, characterizes the stability of foam.
Above-mentioned improved Bikerman method and Ross-Miles method can not be measured the foam performance of viscous liquid, and the Waring-Blender method can be measured the foam performance of viscous liquid.But the condition of measuring for the Waring-Blender method is larger on the experimental result impact, and experiment needs replication to average.Three kinds of methods characterize the stability of foam by the half life period of testing foam.But for above-mentioned different measuring methods, very large difference is also arranged between the data result obtained.
The foam used in oilfield exploitation procedure is to be present in porous medium, has different significantly from normal conditions lower body phase foam.The key distinction is two aspects: the one, at body phase foam, in foam, be being in contact with one another between bubble and bubble, and in reservoir of porous medium outside being in contact with one another of foam bubble removing and bubble, also having contacting of bubble and hole wall, the shattered to pieces process of bubble is subject to the restriction of pore media; The 2nd, the character of foam is subject to the effect of capillary force in oil reservoir, and there is not the effect of capillary force in body phase foam.In oil reservoir, foam has caused the different of foam characteristic from the difference of body phase foam.
And existing evaluation method is not all considered the impact of reservoir pore characteristic on foam stability, so evaluation result can not reflect the stability of foam in porous medium truly.And the foam of oil-gas field development field application plays a role in porous medium, need to understand the stability of foam in porous medium, therefore, need to set up can the true and accurate evaluation in the evaluation method of foam stability in porous medium with for the device of the method.
Summary of the invention
The object of the present invention is to provide a kind of porous medium simulation device for detection of foam stability.
This porous medium simulation device is the pick-up unit that is exclusively used in foam stability in porous medium of the present invention, and it comprises a column casing, wherein: on the wall of described column casing, offer the paired socket more than 2 pairs; Described porous medium simulation device also comprises the paired electrode be plugged in described paired socket, and each socket plugs an electrode; The line of every pair of socket or every pair of electrode is through the center of circle of the circular cross section of described column casing.
Above-mentioned paired electrode has 2-6 couple, preferably 5 pairs; Described paired electrode is equally distributed up and down on the wall of described column casing.
The wall of the column casing of each spigot is provided with the protection tube that holds described electrode.
The upper end of described column casing is provided with openable upper cover, covers on described and offers foam outlet; The bottom of described column casing offers foam inlet.
Stating and filling the particle diameter diameter in porous medium is the glass microballoon of 1～1.5mm.
Another object of the present invention is to provide a kind of pick-up unit that detects the foam stability in porous medium.
This pick-up unit comprises above-mentioned porous medium simulation device and measures the resistance testing device of resistance between the paired electrode in described porous medium simulation device.
Above-mentioned detection device also comprises a constant-flux pump and the Foam Container be connected with the foam inlet of described column casing; In described Foam Container, be provided with a piston that can be driven by described constant-flux pump, described constant-flux pump by drive described piston by the foam delivery in described Foam Container in described column casing.
Above-mentioned detection device also comprises the computing machine be connected with described resistance testing device.
Another purpose of the present invention is to provide the above-mentioned pick-up unit of a kind of use to detect the method for the foam stability in porous medium.Method provided by the invention comprises the following steps:
1) open the upper cover of above-mentioned porous medium simulation device, to filling porous medium in described porous medium simulation device; In described Foam Container, inject foam to be measured;
2) start above-mentioned constant-flux pump by above-mentioned steps 1) in foam delivery in the column casing of described porous medium simulation device:
3) by the resistance value between each paired electrode of different parts in the described porous medium simulation device of above-mentioned resistance testing device detection; The resistance value data of by described computing machine, described resistance testing device being measured are again carried out Treatment Analysis, obtain the stability result of foam in described porous medium.
Step 3) in, described Treatment Analysis comprises the following steps: gather in a period of time, the resistance value between each paired electrode of different parts, then apply following formula calculation stability coefficients R s:
In formula, R is that certain is to resistance value real-time between electrode, R
1Measured lowest resistance value between the paired electrode for different parts in a period of time, R2 is measured highest resistance between the paired electrode of different parts in a period of time; As Rs, more near 0 or 100, illustrate that the tendency of foam system gathering herein is more serious, the foam detected is more unstable; Wherein, assemble near 0 explanation liquid phase, near 100 explanation gas phase gatherings.
Porous medium simulation device for detection of foam stability of the present invention is the pick-up unit that is exclusively used in foam stability of the present invention, by measuring the resistance value between each paired electrode in above-mentioned porous medium simulation device, thereby evaluating is provided, and the resistance value between each paired electrode of measuring that is to say this resistance value to this place's foam in the porous medium at electrode place.
The pick-up unit of foam stability of the present invention can be measured the characteristic of foam in the pore media of different sizes and structure, also can measure the characteristic of conventional foam.The pick-up unit for foam stability in porous medium provided of the present invention, be applicable to oil and gas exploitation and improve the foam stability evaluation of using in foam acidizing in the recovery ratio process, foam fracturing, foam profile control, foam water plugging, foam flooding process.
Evaluation method of the present invention has solved in existing method (above-mentioned Bikerman method, Ross-Miles method, Waring-Blender method) and all has not been suitable for the detection technique difficult problem to foam stability in porous medium, the method characterizes the characteristic of foam in porous medium by certain data processing method and evaluating, be applicable to the foam of various liquid, and have higher stability, accuracy and authenticity.
The accompanying drawing explanation
Fig. 1 is the structural representation of the porous medium simulation device in the embodiment of the present invention 1.
Fig. 2 is the testing process schematic diagram of the foam stability in the embodiment of the present invention 1.
Fig. 3 is the evaluation result of foam in the porous medium set of the Surfactant SDS in the embodiment of the present invention 2.
Fig. 4 is the evaluation result of foam in the porous medium set of the surfactant octadecyl trimethyl amine bromide in the embodiment of the present invention 2.
Fig. 5 is the evaluation result of foam in the porous medium set of the surfactant alkyl polyoxyethylene ether in the embodiment of the present invention 2.
Embodiment
The invention will be further described below in conjunction with specific embodiment, but the present invention is not limited to following examples.
In following embodiment, if no special instructions, be conventional method.
As shown in Figure 2, a kind of pick-up unit for foam stability in porous medium, comprise that one holds Foam Container 1, a porous medium simulation device 3,6, one computing machines 5 of a constant-flux pump and the resistance testing device 4 of foam.
As shown in Figure 1, porous medium simulation device 3, comprise column casing 31 and 5 pairs of paired electrodes 32,33,34,35 and 36 be used to holding glass microballoon and foam to the detailed construction of the porous medium simulation device 3 in Fig. 3.Above-mentioned foam is filled in glass microballoon.On the wall of column casing 31, offer 5 pairs of paired sockets, the line of every pair of socket is through the center of circle of the circular cross section of column casing 31; Paired electrode 32,33,34,35 and 36 is plugged on respectively in above-mentioned paired socket.This paired socket is equally distributed up and down on the wall of column casing, namely above-mentioned paired electrode is also equally distributed up and down on the wall of above-mentioned column casing, on the column casing sidewall of each spigot, is equipped with the protection tube of hold electrodes.
The upper end of column casing 31 is provided with openable upper cover, glass microballoon can be loaded by this upper cover.On being somebody's turn to do, covering and offer foam outlet, this foam outlet can be discharged foam by pipeline.The bottom of column casing 31 also offers foam inlet.
The upper end of Foam Container 1 is provided with outlet, and this outlet is connected with the foam inlet of column casing 31 by pipeline.The lower end of Foam Container 1 can be communicated with constant-flux pump 6 by pipeline, in Foam Container 1, also be provided with piston 2 moving up and down, this piston 2 can move upward under the driving of constant-flux pump 6, thereby the foam in promotion Foam Container 1 is in the column casing 31 of porous medium simulation device 3.On the above-mentioned pipeline connected, all can be provided with operation valve everywhere.
Above-mentioned computing machine 5 is connected with above-mentioned resistance testing device 4, computing machine 5 can measure resistance testing device 4 each resistance data between paired electrode is gathered, processes and analyzes, thereby obtain the stability of foam.
The detection method of foam stability provided by the invention comprises the following steps:
1) assemble pick-up unit shown in Figure 2;
2) open the upper cover of porous medium simulation device 3, to filling glass microballon in porous medium simulation device 3; To the interior injection of Foam Container 1 foam to be measured;
3) start constant-flux pump 6 by step 2) in foam delivery in the column casing 31 of porous medium simulation device 3;
4) by the resistance value between each paired electrode of different parts in resistance testing device 4 detection porous medium simulation devices 3; The resistance value data of by computing machine 5, resistance testing device 4 being measured are again carried out Treatment Analysis, obtain the stability result of foam in described porous medium.
Step 4) in, Treatment Analysis comprises the following steps: the resistance value between each paired electrode of collection different time, different parts, then apply following formula calculation stability coefficients R s:
In formula, R is that certain is to resistance value real-time between electrode, R
1Measured lowest resistance value between the paired electrode for the different time different parts, R2 is highest resistance measured between the paired electrode of different time different parts; As Rs, more near 0 or 100, illustrate that herein foam system is assembled tendency more serious, the foam detected more unstable; Wherein, assemble near 0 explanation liquid phase, near 100 explanation gas phase gatherings.
In testing process, fixedly porous medium is filled the porous medium that model needs, the foam system that contrast test is different; The porous medium that is about to be packed into porous medium simulation device immobilizes, and changes different foam systems and carries out test comparison.Also can change according to different testing requirements the porous medium of different-grain diameter.
The evaluation experimental of embodiment 2, foam stability in porous medium
One, the preparation of experiment
Choose 3 kinds of liquid to be detected: Surfactant SDS, octadecyl trimethyl amine bromide and alkyl polyoxyethylene ether, its key property is as shown in table 1:
Table 1 surfactant basic nature energy
It is 0.25% solution that above-mentioned three kinds of surfactants are mixed with respectively to mass concentration, then the stability of test and assess foam.
Two, the detection of foam stability in porous medium and interpretation of result
Adopt the pick-up unit of the foam stability in above-described embodiment 1, and the stability of foam in the porous medium set of the aqueous solution formation of ready three kinds of Surfactant SDSs, octadecyl trimethyl amine bromide and alkyl polyoxyethylene ether in above-mentioned steps one is provided according to the method provided in above-described embodiment 1.
The glass microballoon particle diameter diameter of filling while setting porous medium in this experiment is 1～1.5mm (experimental temperature is the 10-40 degree, and pressure is no more than 1MPa)
Foam in Foam Container in this experiment in above-described embodiment 1 be by Waring stirrer 3500 turn/stir the foam obtained in 1 minute under the condition of min.
Whole testing process, need to measure different time sections, and the resistance value of the different parts of column casing inner foam, and calculation stability coefficients R s, be tending towards 0 or 100 until monitor stability factor Rs; The resistance value data that obtain that detect are carried out Treatment Analysis by computing machine according to the formula of the evaluating transaction module in embodiment 1, and draw the testing result chart.The relative resistance of the fluid that in above-mentioned evaluating transaction module, in the composition of definition foam system, resistance is little is 0, and the relative resistance of the fluid that resistance is high is 100; As Rs, more near 0 or 100, illustrate that the tendency of foam system gathering herein is more serious; Wherein, assemble near 0 explanation liquid phase, near 100 explanation gas phase gatherings.When Rs starts to occur to assemble tendency, illustrate that the stability of the foam detected starts to descend.
In the evaluation method of foam stability in porous medium of the present invention, the flex point of definable stability factor sudden change is the node of foam loss of stability in porous medium.The definition foam is carved into the time that the foam loss of stability experiences constantly while injecting be the term of validity of porous medium foam.Three kinds of surfactant K12, S35 and 012 testing result are respectively Fig. 3, Fig. 4 and Fig. 5.In Fig. 3-Fig. 5, the A group is the Rs result of 32 of paired electrodes, and the B group is the Rs result of 33 of paired electrodes, and the C group is the Rs result of 34 of paired electrodes, and the D group is the Rs result of 35 of paired electrodes, and the E group is the Rs result of 36 of paired electrodes.In the present embodiment porous medium simulation device, the internal diameter of column casing 31 is 56mm, and external diameter is 80mm, and height is 360mm.The level interval that forms 2 electrodes in every a pair of electrode is 45mm, and the vertical interval of every pair of electrode is 60mm.
As shown in Figure 3, be the evaluation result of foam in setting porous medium of Surfactant SDS, visible K12 just shows aggregation tendency within very short time, and gradient distribution is obvious in vertical direction.
As shown in Figure 4, be the evaluation result of foam in setting porous medium of surfactant octadecyl trimethyl amine bromide, visible stability is best, after having experienced test in 10 days, only shows slight gathering tendency.
As shown in Figure 5, the evaluation result of foam in setting porous medium for the surfactant alkyl polyoxyethylene ether, visible alkyl polyoxyethylene ether probably started to show after 1 day assembles tendency, but the stability factor that on vertical direction, each electrode catheter records changes gently.
Evaluation result is analyzed as follows: the resistance value difference that the test electrode probe in detecting that the different parts in porous media model is arranged arrives.Each all reduces suddenly to the electrode test value after foam injects, and then along with the foam prolongation of standing time, stability gradually changes.Now, each stability factor that electrode is recorded starts to change, owing to after foam destruction, causing gas, liquid to be assembled respectively.The position of air accumulation, stability factor can uprise, and the position stability factor that liquid is assembled reduces.Data just can be seen by experiment, and the upper gas aggregation extent of porous media model increases, and stability factor rises, and lower liquid is assembled, and stability factor reduces.After stability factor finally tends to be steady, just indicate in porous medium that gas and liquid are assembled on a large scale, also just can say that at this time the foam in porous medium lost efficacy.
Claims (5)
1. method that detects the foam stability in porous medium with pick-up unit, described pick-up unit, comprise porous medium simulation device and measure the resistance testing device of resistance between the paired electrode in described porous medium simulation device; Described porous medium simulation device, comprise a column casing, it is characterized in that: on the wall of described column casing, offer the paired socket more than 2 pairs; Described porous medium simulation device also comprises the paired electrode be plugged in described paired socket, and each socket plugs an electrode; The line of every pair of socket or every pair of electrode is through the center of circle of the circular cross section of described column casing; In described column casing, fill the glass microballoon that the particle diameter diameter is 1～1.5mm;
Described pick-up unit also comprises a constant-flux pump and the Foam Container be connected with the foam inlet of described column casing; In described Foam Container, be provided with a piston that can be driven by described constant-flux pump, described constant-flux pump by drive described piston by the foam delivery in described Foam Container in described column casing;
Described pick-up unit also comprises the computing machine be connected with described resistance testing device;
The method comprises the following steps:
1) open the upper cover of described porous medium simulation device, inject foam to be measured in described Foam Container;
2) start described constant-flux pump by above-mentioned steps 1) in foam delivery in the column casing of described porous medium simulation device;
3) by the resistance value between each paired electrode of different parts in the described porous medium simulation device of described resistance testing device detection; The resistance value data of by described computing machine, described resistance testing device being measured are again carried out Treatment Analysis, obtain the stability result of foam in described porous medium; Step 3) in, described Treatment Analysis comprises the following steps: gather in a period of time, the resistance value between each paired electrode of different parts, then apply following formula calculation stability coefficients R s:
In formula, R is that certain is to resistance value real-time between electrode, R
1Measured lowest resistance value between the paired electrode for different parts in a period of time, R2 is measured highest resistance between the paired electrode of different parts in a period of time; As Rs, more near 0 or 100, illustrate that detection foam gathering tendency is more serious, the foam detected is more unstable; Wherein, assemble near 0 explanation liquid phase, near 100 explanation gas phase gatherings.
2. method according to claim 1, is characterized in that, in described porous medium simulation device, described paired electrode has 2-6 couple; Described paired electrode is equally distributed up and down on the wall of described column casing.
3. method according to claim 2, it is characterized in that: in described porous medium simulation device, described paired electrode has 5 pairs.
4. method according to claim 3, it is characterized in that: in described porous medium simulation device, the wall of the column casing of each spigot is provided with the protection tube that holds described electrode.
5. method according to claim 4, it is characterized in that: in described porous medium simulation device, the upper end of described column casing is provided with openable upper cover, covers on described and offers foam outlet; The bottom of described column casing offers foam inlet.
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| CN104297419A (en) * | 2013-07-17 | 2015-01-21 | 国家电网公司 | Device for evaluating liquid foaming performance and foam generating method |
| CN103868959B (en) * | 2014-04-04 | 2016-06-15 | 中国石油大学(华东) | The device and method that a kind of mink cell focus stability characterizes |
| CN106198642A (en) * | 2016-08-30 | 2016-12-07 | 无锡东恒新能源科技有限公司 | Can prevent from testing the carbon nano tube paste dispersion effect tester of electrode damage |
| CN106706890B (en) * | 2017-02-24 | 2023-07-04 | 江苏徐工工程机械研究院有限公司 | Asphalt foaming effect measuring device and method |
| CN106680437A (en) * | 2017-02-28 | 2017-05-17 | 富兰克润滑科技（太仓）有限公司 | Device for testing foam characteristics of metal working fluid |
| US10845322B2 (en) | 2019-01-31 | 2020-11-24 | King Fahd University Of Petroleum And Minerals | Method and apparatus for measuring capillary pressure and foam transport in porous media |
| CN109682749A (en) * | 2019-02-28 | 2019-04-26 | 守正创新生物科技(天津)有限公司 | A kind of detection device of foaming properties |
| CN111912880B (en) * | 2020-07-15 | 2022-04-15 | 中国核动力研究设计院 | Narrow rectangular channel full-field transient cavitation share measurement system and method |
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