CN114486682A - Evaluation device and method for carbon dioxide nano agent imbibition efficiency of shale oil reservoir - Google Patents
Evaluation device and method for carbon dioxide nano agent imbibition efficiency of shale oil reservoir Download PDFInfo
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- CN114486682A CN114486682A CN202210125005.1A CN202210125005A CN114486682A CN 114486682 A CN114486682 A CN 114486682A CN 202210125005 A CN202210125005 A CN 202210125005A CN 114486682 A CN114486682 A CN 114486682A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
Abstract
The invention discloses a device and a method for evaluating carbon dioxide nano-agent imbibition efficiency of a shale oil reservoir.A gas supply part comprises a first gas cylinder and a nano-agent stirring tank, wherein the gas outlet end of the first gas cylinder is communicated with the nano-agent stirring tank; the imbibition part comprises an imbibition chamber, a rock core is detachably mounted in the imbibition chamber, the air inlet end of the imbibition chamber is communicated with the air outlet end of the nano-agent stirring tank, a weighing piece for weighing the imbibition chamber is arranged at the bottom of the imbibition chamber, and the top end of the imbibition chamber is communicated with a metering piece for measuring liquid discharged by the imbibition chamber; the temperature control part comprises a first heat preservation box and a second heat preservation box, the air supply part is positioned in the first heat preservation box, and the infiltration absorption part is positioned in the second heat preservation box. The invention can realize the measurement of the imbibition efficiency of the rock core, and has simple and convenient measurement mode and high measurement precision.
Description
Technical Field
The invention relates to the technical field of efficient development of shale oil reservoirs, in particular to a device and a method for evaluating the imbibition efficiency of a carbon dioxide nano-agent for a shale oil reservoir.
Background
The resource constraint of China is continuously intensified, the rigidity of resource demand is increased, the external dependence is continuously improved, and the external dependence of crude oil in 2021 year is over 70 percent. Shale oil is the key field of unconventional oil exploration and development in the world at present, is regarded as another important continuous energy source of conventional oil and gas resources, and has huge resource potential and exploration and development prospects. The shale oil reserves in China are rich, the resource potential is huge, and the shale oil geological resource potential in China is estimated to be 3.9746 multiplied by 10 according to the natural resources department10t, the potential of recoverable resources is 3.498 multiplied by 109t, the reserve potential is listed as the third world. However, the development of continental facies shale oil in China is in the starting stage, a plurality of research blanks need to be filled, the shale oil reservoir has complex physical properties and has the problems of low porosity and low permeability and difficulty in injection and extraction, and the imbibition oil extraction technology is one of the mature mining technologies at present, so that the deep research on the evaluation method of the imbibition efficiency of the shale oil reservoir has important significance for the efficient mining of shale oil in China.
The carbon capture, utilization and sequestration of the CCUS (carbon Capture) is one of the key technologies for dealing with global climate change, and is highly valued by countries in the world, and in CO2Progress has been made in oil displacement. With the progress of technology and the reduction of cost, the CCUS prospect is bright. CO22Is a colorless, odorless, gas with density greater than that of air at normal temperature and pressure, is one of air components, and has CO content of more than 31.1 deg.C and pressure of more than 7.38MP2Will reach a supercritical state where CO is present2Known as SC-CO2(supercritical CO)2). Its physical and chemical properties can be greatly changed, SC-CO2Has a density close to that of liquid, but has a viscosity close to that of gas, and has an increased diffusion speed in crude oil and an increased dissolving capacity. When the pressure reaches SC-CO2When the pressure of the mixed phase with the crude oil is increased, the interfacial tension between the two is reduced to 0, and the two are mixed into one phase. SC-CO2After being dissolved in crude oil, the crude oil can effectively improve the physical properties of the crude oil, so that the expansion coefficient is increased, the viscosity is greatly reduced, and the fluidity is greatly improved. Due to SC-CO2Is a non-polar solvent and is capable of extracting crude oil, especially n-alkanesThe extraction changes the molecular composition of the total hydrocarbon of the crude oil, and effectively improves the quality of the crude oil. When the reservoir contains water, SC-CO2 is dissolved in water to form acidic fluid to erode most feldspar minerals, thereby widening pore throat channels, changing the physical properties of the oil reservoir and effectively improving the recovery ratio. The phenomena of phase mixing, extraction, corrosion and the like can occur in the oil displacement process, the oil displacement efficiency is greatly improved, and CO can be realized in the oil displacement process2And (7) burying. Relevant experiments show that SC-CO is present in the ultra-low permeability sandstone reservoir2The oil displacement efficiency of miscible displacement can reach 76 percent, and CO under the condition2The burying coefficient can reach 0.8. SC-CO2The technology has a great application prospect in the development of shale oil.
The nano agent has small size effect and specific physical and chemical properties, can be well compatible with pores of a compact reservoir and can improve the problem of the injectivity of the shale oil reservoir. The carbon dioxide response type nanometer agent is a functional nanometer fluid which can regulate and control the functionality of the nanometer agent through carbon dioxide. The nano agent is a modified amphoteric nano material with hydrophilicity and lipophilicity, and carbon dioxide response groups are modified in molecules of the nano agent; after the carbon dioxide is mixed with the established nano-agent, the lipophilicity of the nano-agent is promoted to be enhanced through click reaction, and the diffusivity and the interfacial activity of the nano-agent can be controlled by regulating and controlling the injection amount of the carbon dioxide, so that the shale wetting reversal capability is improved. The carbon dioxide response type nano agent can effectively enhance the imbibition efficiency of the nano agent in the shale oil.
The invention aims to provide a technical method and a quantitative evaluation device for efficient imbibition, and the research has reference significance for efficient development of shale oil reservoirs.
Disclosure of Invention
The invention aims to provide a device and a method for evaluating the imbibition efficiency of a carbon dioxide nano agent for a shale oil reservoir, which are used for solving the problems in the prior art, can realize the imbibition efficiency of a measured rock core, and have the advantages of simple measurement mode and high measurement precision.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a device and a method for evaluating the imbibition efficiency of a carbon dioxide nano agent for a shale oil reservoir,
the gas supply part comprises a first gas cylinder and a nano-agent stirring tank, and the gas outlet end of the first gas cylinder is communicated with the nano-agent stirring tank after being pressurized;
the imbibition part comprises an imbibition chamber, a rock core is detachably mounted in the imbibition chamber, the air inlet end of the imbibition chamber is communicated with the air outlet end of the nano-agent stirring tank, the bottom of the imbibition chamber is provided with a weighing piece for weighing the imbibition chamber, and the top end of the imbibition chamber is communicated with a metering piece for measuring liquid discharged by the imbibition chamber;
the temperature control part comprises a first heat preservation box and a second heat preservation box, the air supply part is located in the first heat preservation box, and the infiltration absorption part is located in the second heat preservation box.
Preferably, the first gas cylinder gas outlet end is communicated with a mixed gas tank, the mixed gas tank gas inlet end is communicated with a second gas cylinder gas outlet end, the mixed gas tank gas outlet end is communicated with a high-pressure gas tank, and the high-pressure gas tank gas outlet end is communicated with the nano-agent stirring tank.
Preferably, carbon dioxide is arranged in the first gas cylinder, and nitrogen is arranged in the second gas cylinder.
Preferably, a placing opening is formed in the bottom end of the imbibition chamber, a placing table is arranged in the placing opening, the core is located at the top end of the placing table, the core and the placing table extend into the imbibition chamber through the placing opening, the diameter of one end, close to the core, of the placing table is smaller than the diameter of one end, far away from the core, of the placing table, and the outer wall of the placing table is abutted against the bottom end of the imbibition chamber.
Preferably, the weighing piece comprises a weighing platform arranged below the placing platform, and the top end of the weighing platform is in contact with the bottom end of the placing platform.
Preferably, the measuring part comprises a measuring pipe fixedly connected with the top end of the infiltration and absorption chamber, the bottom end of the measuring pipe is communicated with the infiltration and absorption chamber, and the bottom of the infiltration and absorption chamber is communicated with a liquid discharge pipe.
Preferably, two sides of the imbibition chamber are respectively provided with a support plate, the support plates are fixedly connected with the imbibition chamber, and the bottom ends of the support plates are in contact with the top end of the weighing platform.
The use method of the carbon dioxide nano agent imbibition efficiency evaluation device for the shale oil reservoir comprises the following operation steps of:
s1, obtaining nano imbibition liquid: injecting carbon dioxide and nitrogen in sections, pressurizing the injected gas, and injecting the gas into a nano-agent stirring tank after the pressurization is finished;
s2, core pretreatment: recording the first mass of the oil washed rock core and the second mass of the oil saturated rock core;
s3, start experiment: putting the saturated rock core into an imbibition chamber, injecting nano imbibition liquid into the imbibition chamber, and recording the discharge volume of kerosene;
s4, weighing the core: taking out the rock core, removing the liquid on the surface of the rock core, putting the rock core into an imbibition chamber, and recording the mass as a third mass;
s5, calculating imbibition efficiency: and calculating the seepage efficiency of the rock core according to the recorded data.
Preferably, in step S2, the first mass is a mass obtained by fully washing and drying the core, and the second mass is a mass obtained by removing kerosene from the surface of the core after the core is subjected to saturated oil treatment.
The invention discloses the following technical effects:
1. through setting up air feed portion, ooze the imbibition for the nanometer that the imbibition room provided and accords with experimental specification, and the nanometer that accords with experimental specification oozes the imbibition and acquires the step simple, has reduced the experiment degree of difficulty.
2. Through setting up control by temperature change portion, carry out different accuse temperatures to air feed portion and imbibition portion, and then satisfy the experiment demand, improve the progressive of experimental result.
3. The infiltration and absorption chamber can be independently injected with gas or nano-agents for infiltration and absorption experimental determination; the adjustable angle of placing of rock core in the imbibition room, wherein the rock core can hang above the kerosene liquid level, survey the imbibition efficiency of syntropy imbibition, the rock core is submergible completely to the kerosene liquid level, surveys the imbibition efficiency of reverse imbibition, and the different inclination of rock core survey gravity is to the influence of imbibition efficiency. The core imbibition efficiency under different states can be measured through the device, and the application range of the device is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic view showing the construction of an imbibition efficiency evaluation apparatus;
FIG. 2 is a schematic view of the construction of the imbibition portion;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
the device comprises a first gas cylinder 1, a nano agent stirring tank 2, a seepage chamber 3, a core 4, a first heat preservation box 5, a second heat preservation box 6, a mixed gas tank 7, a second gas cylinder 8, a high-pressure gas tank 9, a placing table 10, a weighing table 11, a metering pipe 12, a support plate 13, a constant-speed constant-pressure pump 14, a pressure regulating valve 15, a heat-shrinkable film 16 and a liquid discharge pipe 17.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The invention provides a carbon dioxide nano agent imbibition efficiency evaluation device for a shale oil reservoir, which comprises a gas supply part, a gas outlet part and a gas outlet part, wherein the gas outlet part of a first gas cylinder 1 is pressurized and then communicated with a nano agent stirring tank 2; the imbibition portion comprises an imbibition chamber 3, a rock core 4 is detachably mounted in the imbibition chamber 3, the air inlet end of the imbibition chamber 3 is communicated with the air outlet end of the nano-agent stirring tank 2, a weighing piece for weighing the imbibition chamber 3 is arranged at the bottom of the imbibition chamber 3, and the top end of the imbibition chamber 3 is communicated with a metering piece for measuring liquid discharged by the imbibition chamber 3; the temperature control part comprises a first heat preservation box 5 and a second heat preservation box 6, the air supply part is positioned in the first heat preservation box 5, and the infiltration absorption part is positioned in the second heat preservation box 6.
The gas in the first gas bottle 1 is pressurized and then introduced into the nano-agent stirring tank 2, the gas and the nano-agent in the nano-agent stirring tank 2 are fully mixed and then injected into the imbibition chamber 3, the weight of the rock core 4 in different states is recorded, the volume of kerosene discharged from the imbibition chamber 3 is recorded, and the imbibition efficiency of the rock core 4 is finally obtained through calculation. And first insulation can 5 and second insulation can 6 are controlled respectively for the temperature in air feed portion and the imbibition portion satisfies different demands respectively, and then improves the experiment accuracy nature.
Further optimize the scheme, the end intercommunication of giving vent to anger of first gas cylinder 1 has gas mixing tank 7, and gas mixing tank 7 inlet end intercommunication has the second gas cylinder 8 to give vent to anger the end, and gas mixing tank 7 gives vent to anger the end and has high-pressure gas pitcher 9 communicating pipe, and high-pressure gas pitcher 9 gives vent to anger the end and communicates with nanometer agent agitator tank 2. Carbon dioxide alone or nitrogen alone is initially injected into the mixture gas tank 7. In order to verify the influence of the injection amount of the carbon dioxide on the imbibition effect, nitrogen can be injected later. The mode of slug injection, in the experiment, the injection volume ratio of carbon dioxide and nitrogen is 1: 0; 0.8: 0.2; 0.7: 0.3; 0.5: 0.5; 0.3: 0.7; 0.2: 0.8; 0:1. The mixing tank 7 introduces gas into the high-pressure tank 9 to pressurize the gas, thereby obtaining high-pressure gas, and injects the high-pressure gas into the nano-agent stirring tank 2.
Further optimize the scheme, be provided with carbon dioxide in the first gas cylinder 1, be provided with nitrogen gas in the second gas cylinder 8. The carbon dioxide in the first gas bottle 1 is pressurized at constant flow by adopting a step-by-step mixing method to obtain supercritical carbon dioxide fluid, and the supercritical carbon dioxide fluid enters the nano-agent stirring tank 2 to be fully mixed and is finally injected into the infiltration chamber 3. Because the method has the interface activity change caused by the oxidation-reduction reaction of the nano reagent, the second gas cylinder 8 is arranged, and nitrogen is arranged in the second gas cylinder 8, so that the physical and chemical properties of the imbibition agent can be adjusted through the origin of transformation, and the influence of the interface activity change caused by the oxidation-reduction reaction of the nano reagent is reduced.
In one embodiment of the invention, the constant-speed constant-pressure pump 14 is arranged on the mixed gas tank 7, and the mixed gas tank 7 is introduced into the high-pressure gas tank 9 through the constant-speed constant-pressure pump 14 so as to meet the use requirement of the high-pressure gas tank 9. And the constant-speed constant-pressure pump 14 can measure the gas injection amount within a certain time and adjust different flow rates, so that the imbibition efficiency of the supercritical carbon dioxide and the nano-agent in different proportions can be evaluated.
In one embodiment of the present invention, pressure regulating valves 15 are respectively disposed at positions where the first gas cylinder 1, the nano-agent stirring tank 2, the imbibition chamber 3, the mixed gas tank 7, the second gas cylinder 8, and the high-pressure gas tank 9 are connected. The presence of the pressure regulating valve 15 allows for the adjustment of the injection system composition.
Further optimization scheme, 3 bottoms in imbibition room have been seted up and have been placed the mouth, are provided with in placing the mouth and place platform 10, and rock core 4 is located places a 10 top, and rock core 4 with place platform 10 and stretch into imbibition room 3 through placing the mouth in, and place the diameter that platform 10 is close to 4 one ends of rock core and be less than the diameter of placing platform 10 and keeping away from 4 one ends of rock core, place the 3 bottom butts of 10 outer walls in platform and imbibition room. The rock core 4 is placed earlier and is being placed the 10 tops of platform, will install the infiltration and suction chamber 3 afterwards, through placing the mouth and put into infiltration and suction chamber 3 with rock core 4 and infiltration and suction chamber 3 tops, owing to place platform 10 and be the halfpace type structure, consequently under the effect of placing platform 10, place platform 10 and infiltration and suction chamber 3 cooperation and will place the mouth and plug up for it is difficult by placing mouthful outflow to place intraoral kerosene.
In an embodiment of the present invention, a sealing ring (not shown) is disposed in the placing opening, and the sealing effect of the infiltration and suction chamber 3 can be further improved by adding the sealing ring to the placing opening.
In one embodiment of the invention, the outer surface of the core 4 is coated with a heat-shrinkable film 16, and the top and bottom ends of the core 4 are coated with the heat-shrinkable film 16. Since the core 4 is subjected to water swelling so as to increase microcracks in the core 4, a comparative experiment is performed in which the core 4 is wrapped by the heat-shrinkable film 16 in the imbibition experiment.
In a further optimized scheme, the weighing piece comprises a weighing platform 11 arranged below the placing platform 10, and the top end of the weighing platform 11 is in contact with the bottom end of the placing platform 10. The weighing station 11 is used to weigh the core 4 and imbibition chamber 3 to obtain the weights for different states and record them.
In a further optimized scheme, the metering piece comprises a metering pipe 12 fixedly connected with the top end of the imbibition chamber 3, the bottom end of the metering pipe 12 is communicated with the imbibition chamber 3, and the bottom of the imbibition chamber 3 is communicated with a liquid discharge pipe 17. The metering tube 12 is used for measuring the volume of the kerosene discharged from the imbibition chamber 3 and recording the volume of the kerosene discharged from the imbibition chamber 3 so as to meet the requirement of subsequent calculation. And the drain pipe 17 functions to drain the liquid in the imbibition chamber 3.
In a further optimized scheme, two sides of the imbibition chamber 3 are respectively provided with a support plate 13, the support plates 13 are fixedly connected with the imbibition chamber 3, and the bottom ends of the support plates 13 are contacted with the top end of the weighing platform 11. The supporting plate 13 is used for supporting the infiltration suction chamber 3, so that the infiltration suction chamber 3 can be better placed on the weighing platform 11, and the firmness of the device is further improved.
The use method of the carbon dioxide nano agent imbibition efficiency evaluation device for the shale oil reservoir comprises the following operation steps of:
s1, obtaining nano imbibition liquid: and injecting carbon dioxide and nitrogen in sections, pressurizing the injected gas, and injecting the gas into the nano-agent stirring tank 2 after the pressurization is finished. Carbon dioxide in the first gas cylinder 1 and nitrogen in the second gas cylinder 8 are connected in parallel and introduced into the mixed gas cylinder 7, namely, the carbon dioxide is firstly injected, the carbon dioxide injection is stopped after the carbon dioxide is injected in a certain proportion, then the nitrogen is injected, and the carbon dioxide and the nitrogen are introduced into the high-pressure gas cylinder 9 through the constant-speed constant-pressure pump 14. The resulting supercritical carbon dioxide fluid is then passed into the nanoagent stirred tank 2.
In one embodiment of the present invention, the lower limit of the pressure of the high pressure gas tank 9 is not less than 7.38MP, the flow rate is 0.1ml/min, and the temperature of the first incubator 5 is not less than 32 ℃.
S2, core 4 pretreatment: and recording the first mass of the core 4 after oil washing, and recording the second mass of the core 4 after saturated oil. And measuring the first mass M1 of the dried core 4 after being fully washed with oil and the second mass M2 of the core 4 after being wiped on the surface after being saturated with oil. The specific method comprises the steps of fully washing the core 4 with oil, drying at 105 ℃ for 4 hours, placing the core in a drying dish, cooling to room temperature, weighing the mass of the core, recording the mass as a first mass M1, immersing the core 4 in a kerosene-filled suction bottle, sucking the core 4 by a vacuum pump for 24 hours, carrying out saturated kerosene treatment to ensure that the kerosene fully enters pores of the core 4, repeatedly wiping off the kerosene on the surface of the core 4 by using filter paper, and recording a second mass M2 of the core 4 after the saturated kerosene is recorded.
S3, start experiment: and (3) putting the saturated rock core 4 into the imbibition chamber 3, injecting nano imbibition liquid into the imbibition chamber 3, and recording the discharge volume of kerosene. And (3) filling the saturated rock core 4 into an imbibition chamber 3, starting a nano agent stirring tank 2, mixing the supercritical carbon dioxide fluid, injecting the nano imbibition liquid into the imbibition chamber 3, stopping injecting after the nano imbibition liquid submerges the rock core 4, and calculating the injection amount according to the injection time. Setting the temperature at 115 ℃ and the pressure at 35MPa, recording the kerosene discharge volume, and continuously recording for 5d to obtain the final discharged kerosene volume VX.
In one embodiment of the invention, the volumetric value VX of the imbibed displacement crude oil in the metering tube 12 is observed until the liquid level in the tube is constant.
S4, weighing core 4: and taking out the rock core 4, removing the liquid on the surface of the rock core 4, putting the rock core into the imbibition chamber 3, and recording the third mass. The same counting node was used to open the drain pipe 17 in the imbibition chamber 3, after draining the liquid, the core 4 was taken out, and after wiping the surface liquid with filter paper, it was placed again in the imbibition chamber 3, and weighed as the third mass M3 (evaluation of the change in the core 4 after crude oil replacement, and evaluation of the imbibition efficiency again (M3-M1)/(M2-M1))).
S5, calculating imbibition efficiency: and calculating the imbibition efficiency of the rock core 4 according to the recorded data.
The imbibition efficiency calculation formula is as follows:
VX-measuring the oil discharge volume of the pipe, mL;
m1- -mass of core before saturation, g;
m2- -mass of core after saturation, g;
rhooil- -kerosene Density of saturated core, g/cm3。
In a further optimization scheme, in step S2, the first mass is the mass of the core 4 after being fully washed with oil and dried, and the second mass is the mass of the core 4 after being treated with saturated oil and then removing kerosene on the surface of the core 4.
The following table shows experimental data and application results (carbon dioxide and nitrogen injection volume ratio 1: 0):
in the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and 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.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (9)
1. A carbon dioxide nano-agent imbibition efficiency evaluation device for a shale oil reservoir is characterized in that,
the gas supply part comprises a first gas cylinder (1) and a nano-agent stirring tank (2), and the gas outlet end of the first gas cylinder (1) is communicated with the nano-agent stirring tank (2) after being pressurized;
the seepage and suction part comprises a seepage and suction chamber (3), a rock core (4) is detachably mounted in the seepage and suction chamber (3), the air inlet end of the seepage and suction chamber (3) is communicated with the air outlet end of the nano agent stirring tank (2), a weighing piece for weighing the seepage and suction chamber (3) is arranged at the bottom of the seepage and suction chamber (3), and a metering piece for measuring the liquid discharged by the seepage and suction chamber (3) is communicated with the top end of the seepage and suction chamber (3);
the temperature control part comprises a first heat preservation box (5) and a second heat preservation box (6), the air supply part is located in the first heat preservation box (5), and the infiltration absorption part is located in the second heat preservation box (6).
2. The carbon dioxide nanoagent imbibition efficiency evaluation device for shale oil reservoirs of claim 1, wherein: the end intercommunication of giving vent to anger of first gas cylinder (1) has gas mixing tank (7), gas mixing tank (7) inlet end intercommunication has second gas cylinder (8) to give vent to anger the end, gas mixing tank (7) give vent to anger the end and have high-pressure gas pitcher (9) communicating pipe, high-pressure gas pitcher (9) give vent to anger the end with nanometer agent agitator tank (2) intercommunication.
3. The carbon dioxide nanoagent imbibition efficiency evaluation device for the shale oil reservoir as claimed in claim 2, wherein: carbon dioxide is arranged in the first gas bottle (1), and nitrogen is arranged in the second gas bottle (8).
4. The carbon dioxide nanoagent imbibition efficiency evaluation device for shale oil reservoirs of claim 1, wherein: the bottom end of the seepage and suction chamber (3) is provided with a placing opening, a placing table (10) is arranged in the placing opening, the rock core (4) is located at the top end of the placing table (10), the rock core (4) and the placing table (10) stretch into the seepage and suction chamber (3) through the placing opening, the diameter of one end, close to the rock core (4), of the placing table (10) is smaller than that of one end, far away from the rock core (4), of the placing table (10), and the outer wall of the placing table (10) is abutted against the bottom end of the seepage and suction chamber (3).
5. The carbon dioxide nanoagent imbibition efficiency evaluation device for shale oil reservoirs of claim 4, wherein: the weighing piece comprises a weighing platform (11) arranged below the placing platform (10), and the top end of the weighing platform (11) is in contact with the bottom end of the placing platform (10).
6. The carbon dioxide nanoagent imbibition efficiency evaluation device for shale oil reservoirs of claim 1, wherein: the measuring part comprises a measuring pipe (12) fixedly connected with the top end of the infiltration and suction chamber (3), the bottom end of the measuring pipe (12) is communicated with the infiltration and suction chamber (3), and the bottom of the infiltration and suction chamber (3) is communicated with a liquid discharge pipe (17).
7. The carbon dioxide nanoagent imbibition efficiency evaluation device for shale oil reservoirs of claim 5, wherein: supporting plates (13) are respectively arranged on two sides of the infiltration and suction chamber (3), the supporting plates (13) are fixedly connected with the infiltration and suction chamber (3), and the bottom end of each supporting plate (13) is in contact with the top end of the weighing platform (11).
8. The use method of the carbon dioxide nano agent imbibition efficiency evaluation device for the shale oil reservoir according to any one of claims 1 to 7 is characterized in that: the operation steps comprise:
s1, obtaining nano imbibition liquid: injecting carbon dioxide and nitrogen in sections, pressurizing the injected gas, and injecting the gas into the nano-agent stirring tank (2) after the pressurization is finished;
s2, core (4) pretreatment: recording the first mass of the rock core (4) after oil washing, and recording the second mass of the rock core (4) after saturated oil;
s3, start experiment: placing the saturated rock core (4) into an infiltration chamber (3), injecting nano infiltration liquid into the infiltration chamber (3), and recording the discharge volume of kerosene;
s4, weighing core (4): taking out the rock core (4), removing the liquid on the surface of the rock core (4), putting the rock core into the infiltration chamber (3), and recording the rock core as a third mass;
s5, calculating imbibition efficiency: and calculating the imbibition efficiency of the rock core (4) according to the recorded data.
9. The use method of the carbon dioxide nanoagent imbibition efficiency evaluation device for the shale oil reservoir as set forth in claim 8, wherein: in the step S2, the first mass is the mass of the core (4) after being fully washed with oil and dried, and the second mass is the mass of the core (4) after being treated with saturated oil and removed with kerosene on the surface.
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Citations (13)
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