CN113092336A - Device and method for researching influence of coke deposition on reservoir physical properties - Google Patents
Device and method for researching influence of coke deposition on reservoir physical properties Download PDFInfo
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- CN113092336A CN113092336A CN202110366693.6A CN202110366693A CN113092336A CN 113092336 A CN113092336 A CN 113092336A CN 202110366693 A CN202110366693 A CN 202110366693A CN 113092336 A CN113092336 A CN 113092336A
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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
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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
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
- G01N23/046—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material using tomography, e.g. computed tomography [CT]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N24/00—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
- G01N24/08—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects by using nuclear magnetic resonance
- G01N24/081—Making measurements of geologic samples, e.g. measurements of moisture, pH, porosity, permeability, tortuosity or viscosity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
Abstract
The invention provides a device and a method for researching the influence of coke deposition on the physical properties of a reservoir, wherein the device comprises a measuring system for detecting the permeability and porosity distribution of a rock core before and after coking, a saturation system for carrying out saturated oil on the rock core, and a coking system for coking the rock core, wherein the coking system comprises a coke oxidation tank, a high-temperature pyrolysis coking tank and a rock core cleaning device for cleaning the coked rock core. The method is characterized in that the influence of different coking modes, the initial permeability of the rock core and the composition of the rock core on the physical parameters of the rock core after coking is obtained by measuring the change of the physical parameters of the rock core such as the permeability, the porosity distribution and the like before and after the coking of the rock core and researching the change from the dual angles of microcosmic and macroscopic. Compared with the traditional sand filling and combustion tube device, the device has the characteristics of simple structure, simple and easy operation of the experimental process, high experimental accuracy, small error and the like.
Description
Technical Field
The invention belongs to the technical field of oil extraction, and particularly relates to a device and a method for researching influence of coke deposition on reservoir physical properties in an in-situ combustion process.
Background
The quantity of the world thick oil resources is very rich, and the thick oil resources are extremely widely distributed all over the world, and the world has more than 3.3 trillion barrels of thick oil and 5.5 trillion barrels of asphalt resources. The recovery of thick oil began in the last 60 th century, and through the development of several decades, the technology for recovering thick oil has been rapidly improved. At present, the development of thick oil is mainly carried out in the modes of thick oil thermal recovery technology (including in-situ combustion, steam stimulation, steam flooding and the like) and cold recovery (chemical flooding). Thermal oil recovery is the most important method for developing the heavy oil reservoir at present, wherein the in-situ combustion technology has the characteristics of low emission, high temperature, small heat loss, wide action range and the like compared with other thermal oil recovery modes such as steam flooding, steam huff and puff and the like, and is more suitable for developing the heavy oil reservoir.
In-situ combustion is also called fire flooding oil production method, and the principle is to inject air, oxygen or oxygen-enriched gas into the underground, ignite and burn by using an underground ignition device, and utilize heat generated in the burning process to recover unburned petroleum. In the in-situ combustion process, asphaltene in the thick oil can be oxidized at a higher temperature to generate coke, and the coke can be easily ignited due to a lower ignition point, so that the coke is considered as a key factor for realizing the in-situ combustion oil production method. Coke is produced in various ways during in-situ combustion, but oxidative coking and thermal cracking coking are currently generally considered as the two most important coking mechanisms. When the formation temperature is lower than 350 ℃, the thick oil and oxygen are subjected to oxidation reaction to generate coke; and when the temperature reaches 400 ℃, the coke-forming mechanism is gradually transited from oxidation coke-forming to pyrolysis coke-forming.
Coke generated in two modes in the in-situ combustion process can cause certain damage to a reservoir, and the deposition of the coke in a porous medium can influence the physical property and seepage characteristics of the reservoir. And coke deposition can also cause changes in the thermal conductivity of the substrate, affecting the combustion front and formation thermal conductivity.
At present, the influence of coke in-situ combustion on the permeability characteristics of the pores of the reservoir is mainly researched by adopting a physical model experiment at home and abroad, and due to the complexity of coke forming reaction in fireflood, the influence of coke deposition caused by different coke forming modes on the physical properties of the reservoir cannot be clarified in the physical model, so that the influence of the different coke forming modes on the permeability characteristics and the permeability of the pores of the reservoir cannot be quantitatively described.
At present, the influence of the coke deposition of crude oil on a reservoir in the fireflood is not systematically researched on the physical properties of the reservoir influenced by the coke deposition under the oil reservoir condition by a mature and complete experimental method and treatment device in China, and the influence of the coking of the crude oil on the pore permeability characteristics of a physical simulation device is researched by means of the traditional sand filling and combustion tube device. However, such methods have some disadvantages: 1) fire flooding experiments are adopted, the experimental process is complex, uncontrollable factors are more, coking reaction is influenced by multiple factors, and accidental errors of the experiments are large; 2) the influence of coke deposition on the physical properties of a reservoir after crude oil reaction is mostly qualitative description, and the influence of different coking modes on the pore permeability characteristics of the reservoir cannot be clarified, so that the experimental effect is poor, and the experimental result is inaccurate; 3) after the experiment is finished, coke is deposited in the reservoir, and the distribution characteristics of the coke are not further clarified from the microscopic angle, so the experimental analysis is incomplete.
Disclosure of Invention
In order to solve the problems, the invention provides a device for researching the influence of coke deposition on the physical properties of a reservoir, which has a simple structure and a wide application range.
The technical scheme of the invention is as follows: an apparatus for investigating the effect of coke deposition on the physical properties of a reservoir comprises
The saturation system comprises a core holder, an inlet section of the core holder is provided with an oil storage tank and a water tank in parallel, and the core holder is also connected with a confining pressure pump;
the measurement system is mainly used for measuring physical parameters before and after the core is coked, the physical parameters comprise permeability, porosity and a core internal structure, and the measurement system comprises a core gas permeability porosity determinator, a three-dimensional nuclear magnetic imaging analyzer and a CT scanner;
the coking system comprises at least two coking reaction tanks, the coking reaction tanks comprise at least one high-temperature pyrolysis coking-forming tank and at least one oxidation coking tank, the high-temperature pyrolysis coking-forming tank is connected with a nitrogen storage tank, and the oxidation coking tank is connected with an air storage tank; and the number of the first and second groups,
core cleaning equipment.
In one embodiment of the present invention, the saturation system further comprises an injection pump, and the oil storage tank and the water tank are connected to the injection pump.
One embodiment of the invention is that a booster pump is arranged between the air storage tank and the coke oxidation tank.
It is another object of the present invention to provide a method of investigating the effect of coke deposition on reservoir properties, the method comprising the steps of:
step 4, cleaning the coked core;
and 5, testing the porosity and permeability of the cleaned rock core, observing and recording the pore throat structure inside the rock core, and comparing the pore throat structure with the measurement result in the step 2 to obtain the influence of the coke deposition on the physical properties of the reservoir.
One embodiment of the present invention is that the specific operation of the saturated oil in step 1 is: placing a rock core in a rock core holder, and setting confining pressure; firstly, injecting water into the rock core until water drops out from the outlet of the rock core holder, stopping injecting water, then pumping a thick oil sample into the rock core until oil drops out from the outlet of the rock core holder, and completing the saturation of the rock core.
In step 2 and step 5, a three-dimensional nuclear magnetic imaging analyzer and a CT scanner are adopted to observe and record the pore throat structure inside the rock core.
One embodiment of the present invention is that, in step 3, the conditions for pyrolysis into coke are as follows: the pyrolysis was continued for 8 hours at 400 ℃ under a nitrogen atmosphere at a pressure of 0.1 MPa.
In one embodiment of the present invention, in step 3, the oxidation to coke conditions are: the reaction was carried out at 140 ℃ under an air atmosphere of 5MPa for 7 days.
The invention has the beneficial effects that:
(1) the coke deposition process under the oil reservoir condition is simulated through the core coking experiment, and compared with the traditional sand filling and combustion tube device, the experimental process is simple and easy to operate, and the experimental accuracy is high and the error is small.
(2) Different coking modes under the oil reservoir condition are simulated by controlling the temperature and the pressure in the experiment, so that the influence of the different coking modes on the pore permeability characteristic of the reservoir can be conveniently distinguished, the experiment is more comprehensive, and the effect is better.
(3) Considering the influence of different clay minerals in the reservoir on crude oil coking, the reservoir conditions are simulated by using cores with different permeabilities, and the experimental tightness is ensured.
(4) The physical properties of the reservoir are researched from macroscopic and microscopic angles through testing and analyzing rock cores before and after experiments through nuclear magnetism, CT and the like, and the influence of coke deposition on the physical properties of the reservoir and the deposition characteristics of coke in a porous medium are determined.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention;
FIG. 2 is a graph of the change in viscosity of crude oil according to an embodiment of the present invention;
FIG. 3 is a plot of the porosity of a core containing montmorillonite before and after oxidation to char;
FIG. 4 is a porosity profile of a core containing illite before and after oxidation to char;
FIG. 5 is a porosity profile of a core containing kaolinite before and after oxidation to coke;
FIG. 6 is a porosity profile of a core containing chlorite before and after oxidation to char;
FIG. 7 is a plot of porosity before and after pyrolysis of a core containing montmorillonite to char at high temperature;
FIG. 8 is a porosity profile of a core containing illite before and after pyrolysis to coke at high temperature;
FIG. 9 is a porosity profile of a core containing kaolinite before and after pyrolysis to coke at high temperature;
FIG. 10 is a porosity profile of a core containing chlorite before and after pyrolysis to char at high temperature;
FIG. 11 is a CT scan of a core containing kaolinite after oxidation to coke;
in the figure, A is a saturation system, B is a measurement system, and C is a coking system;
1 is gas permeability porosity apparatus, 2 is three-dimensional nuclear magnetic imaging analyzer, 3 is the CT scanner, 4 is the confining pressure pump, 5 is the rock core holder, 6 is the oil storage tank, 7 is the water pitcher, 8 is the injection pump, 9 is the nitrogen gas storage tank, 10 is the oxidation coking jar, 11 is the pyrolysis coking jar, 12 is the booster pump, 13 is the air storage tank, 14 is the rock core cleaning equipment.
Detailed Description
In order to make the technical solutions and technical advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the implementation process of the present invention with reference to the embodiments and the accompanying drawings.
As shown in FIG. 1, an apparatus for investigating the influence of coke deposition on the physical properties of a reservoir comprises
The saturation system A comprises a core holder 5, an oil storage tank 6 and a water tank 7 are arranged at the inlet section of the core holder 5 in parallel, the core holder 5 is also connected with a confining pressure pump 4, and the oil storage tank 6 and the water tank 7 are both connected with an injection pump 8; the saturation system A is mainly used for saturating the rock core with oil.
In some embodiments, the oil storage tank 6 and the water tank 7 are intermediate containers respectively filled with thick oil and water, the oil storage tank 6 and the water tank 7 are arranged between the core holder 5 and the injection pump 8, valves are arranged between the core holder 5 and the two intermediate containers, valves are arranged between the injection pump 8 and the two intermediate containers, and when water or thick oil needs to be injected, the operation can be realized only by adjusting the switches of the corresponding valves.
In other embodiments, two injection pumps 8 are provided, the inlet ends of the two injection pumps 8 are respectively connected to the oil storage tank 6 and the water tank 7, the outlet ends of the two injection pumps 8 are both connected to the core holder 5, valves are arranged between the two injection pumps 8 and the core holder 5, and when water or thick oil needs to be injected, the corresponding injection pumps are opened and the corresponding valves are opened.
In other embodiments, because the thick oil has the characteristics of large viscosity and poor injectability, the heater is arranged on the oil storage tank 6 to heat the thick oil in the oil storage tank 6 to reduce the viscosity, so that the injectability of the thick oil is improved, and meanwhile, the oil storage tank 6 can be heated by adopting an external heater.
The measurement system B is mainly used for measuring core physical property parameters including permeability, porosity distribution and internal structure before and after the core is coked, and comprises a core gas permeability porosity determinator 1, a three-dimensional nuclear magnetic imaging analyzer 2 and a CT scanner 3; the measuring system B is mainly used for measuring physical property parameters of the rock core, so that the permeability and porosity of the rock core before and after coking and the change of the internal structure of the rock core can be obtained, and finally the influence of the coking process on the rock core is obtained. In this embodiment, the three-dimensional MRI analyzer is a MacroMR12-150H-I type large-aperture MRI analyzer, and the CT scanner is a MicroXCT-400 type three-dimensional reconstruction imaging X-ray microscope. In other embodiments, other types of imaging analysis apparatus that achieve the objectives of the present invention may be used.
The system comprises a coking system C and a coke drying system C, wherein the coking system C comprises at least two coking reaction tanks, the coking reaction tanks comprise at least one high-temperature pyrolysis coke-forming tank 11 and at least one oxidation coke-forming tank 10, the high-temperature pyrolysis coke-forming tank 11 is connected with a nitrogen storage tank 9, and the oxidation coke-forming tank 10 is connected with an air storage tank 12; due to the different requirements of the two different coking reactions on the reaction conditions, the following requirements are imposed on the two coking reaction vessels:
for the pyrolysis coke-forming tank 11, since the coking reaction is usually carried out at 400-500 ℃, it is required that the pyrolysis coke-forming tank 11 can withstand the temperature, and at the same time, a heat source is also required to make the pyrolysis coke-forming tank 11 reach the corresponding coking reaction temperature. In some embodiments, a muffle furnace is used as the heat source, and in other embodiments, heating wires are provided in the pyrolysis coke-forming tank 11, and corresponding temperature control devices are provided to raise the temperature of the pyrolysis coke-forming tank.
For the oxidation coke tank 10, based on the reaction characteristics of oxidation coke formation, the oxidation coke tank 10 is required to be a pressure-bearing container, and according to the characteristics of the oxidation coke tank 10, the oxidation coke tank 10 is required to be capable of bearing the pressure of 0.1-40MPa, and certainly, under some conditions, the oxidation coke formation experiment under higher pressure is not required to be carried out, so the oxidation coke tank 10 can also be required to be capable of bearing the pressure of 0.1-10MPa or even lower, and meanwhile, because the oxidation coke formation reaction needs to be carried out under the conditions of 140-300 ℃, the oxidation coke tank 10 is required to be capable of bearing the temperature. Meanwhile, since oxidative coking needs to be performed under a certain pressure condition, a booster pump 12 is connected between the oxidation coke tank 10 and the air storage tank 13 for providing a required reaction pressure for the oxidation coke tank 10.
The core cleaning equipment 14 is mainly used for cleaning the coked core, so that the influence of residual crude oil in the core on the measurement of subsequent physical property parameters is avoided.
A method of investigating the effect of coke deposition on reservoir properties, comprising the steps of:
And 2, respectively arranging the two rock cores with the permeability, the porosity and the internal structure of the rock core measured in the step 1 in different rock core holders, setting confining pressure which is the same as the environment of a target stratum, pumping water in a water tank into the rock core through a pump, stopping water injection after water is discharged from the outlet end of the rock core holder, injecting thick oil of the target stratum into the rock core through the pump, and stopping oil injection when oil appears at the outlet end of the rock core holder. In the operation process, the phenomenon of oil-water coexistence in the reservoir is mainly simulated. The water saturation of the core can be calculated by injecting water firstly, and the data can be used as basic research data of a subsequent nuclear magnetic resonance test T2 spectrum and a layered image. Simultaneously, in actual reservoir, also can have certain constraint water, consequently, this embodiment carries out saturated oil through the mode that carries out saturated water, back through oiling flooding to the rock core at first, accords with the actual stratum condition.
wherein, a rock core is pyrolyzed to coke, and the reaction conditions are as follows: the core is placed in a high-temperature pyrolysis coking tank, the high-temperature pyrolysis coking tank is in a nitrogen atmosphere, the temperature is 400 ℃, the coking reaction time is 8 hours, and the high-temperature pyrolysis coking is carried out under the condition, so the high-temperature pyrolysis coking condition is set, and the high-temperature pyrolysis coking condition is discovered in the early exploration process of an inventor, the high-temperature pyrolysis coking only needs to be ensured under the conditions of temperature, oxygen-free condition and certain coking time, and the system pressure in the coking process almost has no influence on the coking result; meanwhile, the coke formation time is set to 8h only for sufficient reaction, and in other embodiments, different coke formation times may be set;
and the other core is subjected to oxidation coking reaction under the following reaction conditions: the rock core is placed in a coke oxidation tank, the coke oxidation tank is in an air atmosphere, the pressure is 5MPa, the temperature is 140 ℃, the coking reaction time is 7 days, and the oxidation coking is carried out under the condition.
And 4, cleaning the coked rock core, wherein the rock core is cleaned by adopting rock core cleaning equipment produced by Seisan Zeming Petroleum Equipment Co., Ltd in the embodiment, cleaning liquid is filled in the rock core cleaning equipment when the rock core is cleaned, then the rock core to be cleaned is placed in the rock core cleaning equipment and is heated, in the heating process, the cleaning liquid can dissolve oil remained on the surface of the rock core and in the pore structure of the rock core, and coke deposited in the pores and throat of the rock core can be remained in the rock core. In this example, toluene was used as the cleaning agent, and in the remaining examples, the remaining cleaning agents were used.
And 5, testing the permeability and the porosity of the cleaned rock core, and observing the internal structure of the cleaned rock core, wherein the specific method is the same as that in the step 2.
The following examples are presented to further illustrate the apparatus and method of the present invention.
The basic physical properties of the thick oils tested are shown in tables 1-1, 1-2 and FIG. 2:
TABLE 1-1 crude oil base physical Properties parameters and elemental composition
TABLE 1-2 crude SARA component content
Some cores used in the experiment and their parameters were as follows:
the pore distribution of the core is shown in figures 3-6 before and after oxidative coking; the pore distribution of the core before and after high temperature pyrolysis coking is shown in figures 7-10.
From the graphs a in fig. 3-6, which are the porosity distribution patterns of the core with the initial gas logging permeability of about 2000mD before and after oxidation and coking, it can be seen that the porosity of the hypertonic core is reduced by 13.7% at most, and the porosity change of the hypertonic core is large, which indicates that the coke deposition has a greater influence on the porosity of the hypertonic core, and the coke deposition causes blockage in the pores and throat of the core, so that the pore size distribution of the core is influenced by the pore size reduction, the porosity of the core is reduced, and the core seepage characteristics are weakened.
The b diagrams in fig. 3-6 are the porosity distribution patterns of the core with the gas permeability of about 500mD before and after the core is oxidized into coke, and it can be seen that the distribution of the core pore radius is concentrated between 0.1 and 20 μm, the pore radius of the low-permeability core after the core is oxidized is obviously reduced between 0.1 and 10 μm, and the porosity of the low-permeability core is reduced by 12.4 percent at most. The crude oil is subjected to low-temperature oxidation reaction in a core pore structure to generate coke which is deposited in core pores and throats, so that the seepage capability of the core pore structure is reduced, and meanwhile, the clay minerals such as montmorillonite and kaolinite are contained in the core, so that on one hand, the crude oil low-temperature oxidation reaction can be catalyzed, more oxidation products coke can be deposited in the pores, and the core pore seepage characteristic is reduced; on the other hand, clay minerals can also be transported or adsorbed on the surface of coke and blocked in the pore channels, so that the pore size of the core is reduced.
Referring to fig. 7-10, for the high permeability core, the core is mostly provided with inter-granular pores with a pore diameter of 1-15 μm, the pore diameter is large, the throat is thick, the connectivity is good, after crude oil in the core is pyrolyzed into coke, small coke particles are deposited in the pores and the throat, the influence on the permeability of the core is limited, and in addition, under the high temperature condition, coke residues may be accumulated in new cracks, and the change of the pore diameter distribution and the porosity of the core is not obvious.
See fig. 11, which is a reconstructed image (CT scan reconstructed image) of a core, numbered GL1500-1, after oxidation to coke, using a micro xct-400 model three-dimensional reconstruction imaging X-ray microscope, wherein fig. 11(a) is an initial image and fig. 11(b) is an exploded view, wherein the off-white is coke particles, from which it can be seen that a significant amount of coke particles are present in the core after coking. In fact, although this example does not have its internal structure made, it will be appreciated by those skilled in the art that there are still more coke particles inside the core. Therefore, the change of the porosity distribution of the rock core before and after coking, the change of permeability and the distribution condition of coke particles can be obtained by the skilled person according to the invention, and then the rock core is analyzed.
In conclusion, by adopting the device and the method, the influence of the coking mode (oxidation coking and high-temperature pyrolysis coking) on the permeability and the porosity of the core can be researched, meanwhile, the influence of the initial permeability of the core and the mineral composition of the core on the porosity distribution and the permeability of the coked core can be researched, and better data support can be provided for the subsequent heavy oil exploitation.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. An apparatus for investigating the effect of coke deposition on reservoir properties, comprising
The saturation system comprises a core holder, an inlet section of the core holder is provided with an oil storage tank and a water tank in parallel, and the core holder is also connected with a confining pressure pump;
the measuring system is used for measuring the porosity and permeability of the rock core and observing the internal structure of the rock core; the device comprises a rock core gas permeability porosity determinator, a three-dimensional nuclear magnetic imaging analyzer and a CT scanner;
the coking system comprises at least two coking reaction tanks, the coking reaction tanks comprise at least one high-temperature pyrolysis coking-forming tank and at least one oxidation coking tank, the high-temperature pyrolysis coking-forming tank is connected with a nitrogen storage tank, and the oxidation coking tank is connected with an air storage tank; and the number of the first and second groups,
core cleaning equipment.
2. The apparatus of claim 1, wherein the measurement system comprises a core gas permeability porosimeter, a magnetic resonance imaging analyzer, and a CT scanner.
3. The apparatus of claim 1, wherein the saturation system further comprises a fill pump, and wherein the storage tank and the water tank are both connected to the fill pump.
4. The apparatus of claim 1, wherein a booster pump is further provided between said air storage tank and said coke oxidizing tank.
5. A method of investigating the effect of coke deposition on reservoir properties, comprising the steps of:
step 1, taking a rock core, testing porosity and permeability, and observing and recording the internal structure of the rock core;
step 2, carrying out saturated oil on the rock core;
step 3, putting the rock core in the step 2 into a reaction kettle for a coking reaction, wherein the coking reaction is one of high-temperature pyrolysis to form coke and oxidation to form coke;
step 4, cleaning the coked core;
and 5, testing the porosity and permeability of the cleaned rock core, observing and recording the pore throat structure inside the rock core, and comparing the pore throat structure with the measurement result in the step 2 to obtain the influence of the coke deposition on the physical properties of the reservoir.
6. The method as claimed in claim 5, wherein in step 1 and step 5, the pore throat structure inside the core is observed and recorded by using a three-dimensional nuclear magnetic imaging analyzer and a CT scanner.
7. The method according to claim 5, characterized in that the specific operations of the saturated oil in the step 2 are as follows: placing a rock core in a rock core holder, and setting confining pressure; injecting water into the rock core until water drops out of the outlet of the rock core holder, and stopping injecting water; and pumping the thick oil sample into the rock core until oil drops out from the outlet of the rock core holder, and completing the saturation of the rock core.
8. The method according to claim 5, wherein in step 3, the conditions for pyrolysis into coke are as follows: the pyrolysis was continued for 8 hours at 400-.
9. The method according to claim 5, wherein in step 3, the conditions for oxidation to coke are as follows: under the air atmosphere with the pressure of 5MPa, the temperature is 140-300 ℃, and the oxidation is continued for 7 days.
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