CN113236208A - Experimental device and method for physically simulating polymer flooding production liquid descending rule - Google Patents
Experimental device and method for physically simulating polymer flooding production liquid descending rule Download PDFInfo
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- CN113236208A CN113236208A CN202110426980.1A CN202110426980A CN113236208A CN 113236208 A CN113236208 A CN 113236208A CN 202110426980 A CN202110426980 A CN 202110426980A CN 113236208 A CN113236208 A CN 113236208A
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- 229920000642 polymer Polymers 0.000 title claims abstract description 87
- 239000007788 liquid Substances 0.000 title claims abstract description 76
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title abstract description 23
- 238000002347 injection Methods 0.000 claims abstract description 26
- 239000007924 injection Substances 0.000 claims abstract description 26
- 238000006073 displacement reaction Methods 0.000 claims abstract description 20
- 238000002474 experimental method Methods 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 43
- 239000011435 rock Substances 0.000 claims description 31
- 239000008398 formation water Substances 0.000 claims description 23
- 239000012530 fluid Substances 0.000 claims description 17
- 239000011148 porous material Substances 0.000 claims description 13
- 229920006395 saturated elastomer Polymers 0.000 claims description 13
- 230000007423 decrease Effects 0.000 claims description 11
- 239000007864 aqueous solution Substances 0.000 claims description 7
- 239000000243 solution Substances 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 abstract description 14
- 230000035699 permeability Effects 0.000 abstract description 13
- 238000004088 simulation Methods 0.000 abstract description 13
- 238000011160 research Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 230000008859 change Effects 0.000 description 8
- 238000011161 development Methods 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 3
- 239000003129 oil well Substances 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- 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
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- 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
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
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- 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
-
- 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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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Abstract
The invention discloses an experimental device and a method for physically simulating a polymer flooding production liquid descending rule, wherein the experimental device comprises an injection system, a constant temperature system and a collection system; the physical simulation experiment method for the polymer flooding production liquid descending rule provided by the invention researches the production liquid descending rule in the polymer flooding process under different polymer injection concentrations, different reservoir permeability grade differences and different polymer injection occasions, provides a reasonable polymer flooding production liquid descending range, solves the problem of adjusting the process scheme when a polymer injection oil field is injected, and obtains parameters and curves representing the polymer flooding production liquid descending rule. The core used in the invention is a two-dimensional flat core, and is closer to the real situation of an oil field compared with the conventional one-dimensional core. The invention can carry out experiments of different polymer flooding modes, further can obtain the polymer flooding production liquid descending rule and the oil displacement effect data under different parameters, and simultaneously has simple whole experimental process and flexible and convenient operation.
Description
Technical Field
The invention belongs to the technical field of petroleum development, and particularly relates to an experimental device and method for physically simulating a polymer flooding production liquid descending rule.
Background
For oil reservoirs with strong heterogeneity, along with the development of polymer flooding, the heterogeneity of the reservoir is further enhanced, so that the liquid production of oil wells is reduced to different degrees, and the polymer flooding effect is influenced. Meanwhile, a large number of polymer flooding field tests show that after the oil deposit is injected with polymers, the liquid production capacity of the oil well is reduced, and the universality is realized. Research shows that by researching the influence of different factors on the polymer liquid production decline rule, the implementation scheme and the process can be adjusted in time in the polymer flooding development process, and the situation that the liquid production quantity of an oil well is reduced due to the decline of the liquid production capacity, the implementation of a polymer flooding mine field and the subsequent oil increasing effect are influenced is avoided. In order to adjust the process scheme in the implementation process of polymer flooding in time and improve the flooding efficiency to the maximum extent, it is necessary to research the decreasing rule of polymer flooding production fluid by parameters such as different polymer concentrations, level differences of reservoir permeability, time for polymer injection and the like according to the properties and stratum characteristics of a flooding system. At present, the literature also relates to research on the polymer flooding liquid descending rule, but mainly in the aspect of numerical simulation and physical simulation, aiming at factors influencing the polymer flooding liquid descending rule, the research is single and not comprehensive enough, and a systematic physical simulation method is not formed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an experimental device and method for physically simulating a polymer flooding production liquid descending rule.
The invention is realized by the following technical scheme:
an experimental device for physically simulating a polymer flooding production liquid descending rule comprises an injection system, a constant temperature system and a collection system;
the injection system comprises a displacement pump, an intermediate water container, an intermediate oil container, an intermediate system container, a six-way valve and a pressure gauge, wherein the displacement pump is respectively communicated with the intermediate water container, the intermediate oil container and the intermediate system container through pipelines, the intermediate water container, the intermediate oil container and the intermediate system container are respectively connected with the six-way valve, and the pressure gauge is arranged at the six-way valve;
the constant temperature system comprises a valve, a temperature box and a core model, wherein the core model is arranged in the temperature box, a liquid inlet point, a liquid outlet point and a pressure collecting point are arranged on the surface of the core model, and the liquid inlet point of the core model is connected with the six-way valve through a pipeline;
the collecting system comprises a liquid quantity collecting pipe, a pressure sensor and a pressure collector, wherein the liquid quantity collecting pipe is connected with a liquid outlet point of the rock core model through a pipeline, the pressure sensor is arranged at a pressure collecting point of the rock core model, and the pressure sensor is connected with the pressure collector.
In the technical scheme, the rock core model is a two-dimensional flat plate cemented heterogeneous rock core.
In the technical scheme, the number of the liquid inlet points is 1, the number of the liquid outlet points is 3, and the liquid inlet points and the liquid outlet points are symmetrically arranged at four corners of the rock core model.
In the technical scheme, the pressure collection points are respectively arranged at the liquid inlet point, the liquid outlet point and the center of the core model.
In the technical scheme, the pressure collector is connected with a computer, and the computer is used for recording data of the pressure collector.
An experimental method for physically simulating a polymer flooding production liquid descending rule is carried out according to the following steps:
1) drying the experimental rock core, and vacuumizing the interior of the rock core model by using a vacuum pump;
2) sucking simulated formation water into the core model until the core model is saturated in water, and measuring the porosity and the pore volume of the core model;
3) injecting simulated oil into the core model which is saturated by sucking the simulated formation water until the outlet of the core model does not discharge the simulated formation water;
4) injecting simulated formation water into the core model saturated with the simulated oil until the instantaneous water content value of the outlet end of the core reaches a set value;
5) injecting an oil displacement system into the core model with the instantaneous water content of the outlet end of the core reaching a set value, and injecting simulated bottom water into the core model after injecting the oil displacement system with the specified core pore volume multiple;
6) and after the simulated oil does not appear at the outlet end of the rock core, further completing an experiment of physically simulating the polymer flooding production liquid descending rule under the target condition.
7) And 4), recording the instantaneous oil quantity, water quantity and pressure at two ends of the core in real time, wherein the instantaneous oil quantity, water quantity and pressure at two ends of the core are produced in the steps 4, 5 and 6).
In the technical scheme, the simulated formation water is prepared according to the ion composition of the formation water of the target oil field.
In the technical scheme, the oil displacement system is polymer aqueous solutions with different concentrations.
In the technical scheme, the rock core model is a two-dimensional flat plate cemented heterogeneous rock core.
In the above technical solution, in step 4), the instantaneous water content value refers to a percentage of a water yield to a total liquid yield of the outlet end solution discharged in a period of 30 seconds to 60 seconds;
in the above technical solution, in step 5), the core pore volume multiple refers to a ratio of a volume of the injected flooding system to a core model pore volume.
The invention has the advantages and beneficial effects that:
for an oil reservoir with strong heterogeneity, in the initial stage of polymer injection, the injection of the polymer can obtain a good precipitation and oil increasing effect, but as the polymer development is carried out, the heterogeneity of the reservoir can be further enhanced, and if the polymer flooding is carried out continuously according to the original scheme, the precipitation and oil increasing effect cannot be achieved, but the heterogeneity of the reservoir can be further enhanced, and the subsequent scheme adjustment is influenced. The physical simulation experiment method for the polymer flooding production liquid descending rule provided by the invention researches the production liquid descending rule in the polymer flooding process under different polymer injection concentrations, different reservoir permeability grade differences and different polymer injection occasions, provides a reasonable polymer flooding production liquid descending range, solves the problem of adjusting the process scheme when a polymer injection oil field is injected, and obtains parameters and curves representing the polymer flooding production liquid descending rule. The core used in the invention is a two-dimensional flat core, and is closer to the real situation of an oil field compared with the conventional one-dimensional core. The invention can carry out experiments of different polymer flooding modes, further can obtain the polymer flooding production liquid descending rule and the oil displacement effect data under different parameters, and simultaneously has simple whole experimental process and flexible and convenient operation.
Drawings
FIG. 1 is a schematic diagram of a system connection structure of a physical simulation experiment apparatus according to the present invention.
FIG. 2 is a graph of permeability step versus polymer flooding fluid decline.
FIG. 3 is a plot of polymer injection concentration versus polymer flooding fluid decline.
FIG. 4 is a plot of timing of polymer injection versus polymer flooding fluid decline.
Wherein: the system comprises an injection system 1, a constant temperature system 2, a collection system 3, a displacement pump 4, an intermediate water container 5, an intermediate oil container 6, an intermediate system container 7, a six-way valve 8, a pressure gauge 9, a valve 10, a two-dimensional flat rock core model 11, a liquid amount collection pipe 12, a pressure sensor 13 and a pressure collector 14.
For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the present invention is further described below with reference to specific examples.
Example 1
As shown in fig. 1, the experimental apparatus of this embodiment includes a set of injection system 1, a set of constant temperature system 2 and a set of collection system 3. The injection system is formed by connecting a displacement pump 4, an intermediate water container 5, an intermediate oil container 6, an intermediate system container 7, a six-way valve 8 and a pressure gauge 9; the constant temperature system is formed by connecting a valve 10, a constant temperature box and a two-dimensional flat rock core model 11; the collecting system is formed by connecting a liquid quantity collecting pipe 12, a pressure sensor 13 and a pressure collector 14.
The physical simulation experiment method for the polymer flooding fluid production decline law comprises the following steps:
1) drying the experimental rock core 11, and vacuumizing the interior of the rock core model by using a vacuum pump;
2) sucking simulated formation water into the core model 11 until the core model is saturated in water, and measuring the porosity and the pore volume V1 of the core model;
3) injecting simulated oil into the core model 11 which is saturated by sucking simulated formation water through the intermediate container 6 until the outlet of the core model 11 does not discharge the simulated formation water, finishing building bound water and recording the volume V2 of the produced simulated formation water;
4) injecting simulated formation water into the core model 11 saturated with the simulated oil until the instantaneous water content value at the outlet end of the core 11 reaches a set value Swi, and recording the core pressure, the instantaneous liquid outlet amount at the outlet end and the accumulated liquid outlet amount at regular intervals;
5) injecting an oil displacement system into the core model 11 with the instantaneous water content of the outlet end of the core 11 reaching a set value, injecting the oil displacement system with the specified core pore volume multiple PV, wherein the volume of the oil displacement system is V3, then injecting simulated bottom water into the core model 11, and recording the core pressure of a pressure gauge 9, the pressure of a pressure collector 14, the instantaneous liquid output of the outlet end liquid production pipe 12 and the accumulated liquid output at regular intervals;
6) and after the simulated oil does not appear at the outlet end of the rock core, further completing an experiment of physically simulating the polymer flooding production liquid descending rule under the target condition.
The simulated formation water is prepared according to the formation water of the target oil field;
the oil displacement system is polymer aqueous solution with different concentrations;
the core model is a two-dimensional flat plate cemented heterogeneous core, and the permeability range is K.
In the step 4), the instantaneous water content value Swi is the percentage of the water yield to the total liquid yield of the outlet solution discharged in 30-60 seconds, Swi is the corresponding time point and is the time for injecting the polymer;
in the above embodiment, V1 is the volume of simulated formation water intake and is also the pore volume of the core model, V2 is the saturated oil volume of the core model, V3 is the volume of the injection flooding system, and PV is the ratio of the injection flooding system to the pore volume: and PV is V3/V1, K is the grade difference of the permeability of the core, and is the ratio of the permeability of the high-permeability layer to the permeability of the low-permeability layer of the core.
The embodiment can be used for carrying out experiments of different polymer flooding modes, further obtaining the polymer flooding production liquid descending rule and the oil displacement effect data under different parameters, and improving guidance for adjusting and implementing the polymer flooding process scheme for different polymer injection oil fields.
Example 2:
on the basis of the embodiment 1, a polymer flooding fluid production decline law physical simulation experiment is carried out on a certain polymer injection oilfield, and the specific process is as follows:
1) drying a core model 11 with the permeability level difference of K1, and vacuumizing the interior of the core model 11 by using a vacuum pump;
2) sucking simulated formation water into the core model 11 until the core model 11 is saturated in water, and measuring the porosity and the pore volume V1 of the core model 11;
3) injecting simulated oil into the core model 11 which is saturated by sucking simulated formation water through the intermediate container 6 until the outlet of the core model 11 does not discharge the simulated formation water, finishing building bound water and recording the volume V2 of the produced simulated formation water;
4) injecting simulated formation water into the rock core model 11 which is saturated with simulated oil through the intermediate container 5, performing a water flooding experiment until the instantaneous water content value Swi of the outlet end of the rock core reaches 70%, and recording the pressure of the rock core, the instantaneous water yield of the outlet end, the instantaneous total liquid yield and the accumulated liquid yield every 30 seconds in the water flooding experiment process;
5) after the instantaneous water content value Swi of the outlet end of the rock core reaches 70%, injecting a polymer aqueous solution with the concentration of 1750mg/L into the rock core model, wherein the amount of the injected polymer aqueous solution is 0.3PV, and recording the pressure of the rock core, the instantaneous water yield of the outlet end, the instantaneous total liquid yield and the accumulated liquid yield every 30 seconds in the experimental process of injecting the polymer aqueous solution;
6) continuing to inject simulated bottom water into the core model, performing a subsequent water flooding experiment, and recording the core pressure, the instantaneous water yield at the outlet end, the instantaneous total liquid yield and the accumulated liquid yield every 30 seconds;
7) and after the simulated oil does not appear at the outlet end of the rock core, completing a physical simulation experiment of the descending rule of the physical simulation polymer flooding production liquid under the extremely poor permeability.
Changing the permeability grade difference of the core, and repeating the physical simulation experiments of the steps 2) to 7) to obtain a polymer flooding liquid production descending rule change curve under different permeability grade differences, wherein a liquid production rate change rule curve under different permeability grade differences is shown in fig. 2.
The physical simulation experiment steps of the polymer concentration to polymer flooding fluid reduction change rule are similar to the steps 1) to 7), the polymer concentration to polymer flooding fluid reduction change rule can be obtained by changing the concentration of the polymer aqueous solution in the step 5), and a fluid production rate change rule curve under the polymer concentration is shown in fig. 3.
The physical simulation experiment step of the polymer injection timing to polymer flooding production liquid descending change rule is similar to the steps 1) to 7), the polymer injection timing to polymer flooding production liquid descending change rule can be obtained by changing the instantaneous water content value Swi of the outlet end in the steps 4) and 5), and a curve of the polymer injection timing to polymer flooding production liquid descending change rule is shown in FIG. 4.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.
Claims (9)
1. An experimental device for physically simulating the decline law of polymer flooding production fluid is characterized in that: comprises an injection system, a constant temperature system and an acquisition system;
the injection system comprises a displacement pump, an intermediate water container, an intermediate oil container, an intermediate system container, a six-way valve and a pressure gauge, wherein the displacement pump is respectively communicated with the intermediate water container, the intermediate oil container and the intermediate system container through pipelines, the intermediate water container, the intermediate oil container and the intermediate system container are respectively connected with the six-way valve, and the pressure gauge is arranged at the six-way valve;
the constant temperature system comprises a valve, a temperature box and a core model, wherein the core model is arranged in the temperature box, a liquid inlet point, a liquid outlet point and a pressure collecting point are arranged on the surface of the core model, and the liquid inlet point of the core model is connected with the six-way valve through a pipeline;
the collecting system comprises a liquid quantity collecting pipe, a pressure sensor and a pressure collector, wherein the liquid quantity collecting pipe is connected with a liquid outlet point of the rock core model through a pipeline, the pressure sensor is arranged at a pressure collecting point of the rock core model, and the pressure sensor is connected with the pressure collector.
2. The experimental device for physically simulating the polymer flooding fluid descending law according to claim 1, is characterized in that: the rock core model is a two-dimensional flat plate cementing heterogeneous rock core.
3. The experimental device for physically simulating the polymer flooding fluid descending law according to claim 1, is characterized in that: the number of the liquid inlet points is 1, the number of the liquid outlet points is 3, and the liquid inlet points and the liquid outlet points are symmetrically arranged at four corners of the rock core model.
4. The experimental device for physically simulating the polymer flooding fluid descending law according to claim 1, is characterized in that: the pressure collection points are respectively arranged at the liquid inlet point, the liquid outlet point and the center of the rock core model.
5. The experimental device for physically simulating the polymer flooding fluid descending law according to claim 1, is characterized in that: the pressure collector is connected with a computer, and the computer is used for recording data of the pressure collector.
6. An experimental method for physically simulating the polymer flooding production liquid descending law is characterized by comprising the following steps of:
1) drying the experimental rock core, and vacuumizing the interior of the rock core model by using a vacuum pump;
2) sucking simulated formation water into the core model until the core model is saturated in water, and measuring the porosity and the pore volume of the core model;
3) injecting simulated oil into the core model which is saturated by sucking the simulated formation water until the outlet of the core model does not discharge the simulated formation water;
4) injecting simulated formation water into the core model saturated with the simulated oil until the instantaneous water content value of the outlet end of the core reaches a set value;
5) injecting an oil displacement system into the core model with the instantaneous water content of the outlet end of the core reaching a set value, and injecting simulated bottom water into the core model after injecting the oil displacement system with the specified core pore volume multiple;
6) and after the simulated oil does not appear at the outlet end of the rock core, further completing an experiment of physically simulating the polymer flooding production liquid descending rule under the target condition.
7) And 4), recording the instantaneous oil quantity, water quantity and pressure at two ends of the core in real time, wherein the instantaneous oil quantity, water quantity and pressure at two ends of the core are produced in the steps 4, 5 and 6).
7. The experimental method for physically simulating the polymer flooding fluid decline law according to claim 6, wherein the experimental method comprises the following steps: the oil displacement system is polymer aqueous solution with different concentrations.
8. The experimental method for physically simulating the polymer flooding fluid decline law according to claim 6, wherein the experimental method comprises the following steps: in step 4), the instantaneous water content value refers to the percentage of the water yield to the total liquid yield of the outlet end solution in the liquid discharged in 30-60 seconds;
9. the experimental method for physically simulating the polymer flooding fluid decline law according to claim 6, wherein the experimental method comprises the following steps: in the step 5), the core pore volume multiple refers to a ratio of the volume of the injected oil displacement system to the core model pore volume.
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