CN106770377B - The device and method of remaining oil distribution are monitored during carbon dioxide displacement core - Google Patents

The device and method of remaining oil distribution are monitored during carbon dioxide displacement core Download PDF

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CN106770377B
CN106770377B CN201611035789.XA CN201611035789A CN106770377B CN 106770377 B CN106770377 B CN 106770377B CN 201611035789 A CN201611035789 A CN 201611035789A CN 106770377 B CN106770377 B CN 106770377B
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carbon dioxide
core
cooler
liquid
booster pump
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CN106770377A (en
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柏明星
宋考平
付晓飞
殷代印
刘斌
张志超
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Bazhou Guanghe Gas Resources Co ltd
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Northeast Petroleum University
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/70Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells

Abstract

A kind of device and method that carbon dioxide displacement core monitors remaining oil distribution in the process.Main purpose is to provide a kind of experimental provision and acquisition methods that can obtain microscopic remaining oil spatial distribution state in core in liquid or supercritical carbon dioxide oil displacement process.It is characterized by: described device is made of the first storage tank, the second storage tank, the first booster pump, the second booster pump, heater, the first cooler, the rock core fastener with seal pack device, CT scanner, solid filter, liquid filter, the second cooler, the first control valve, the second control valve, first pressure gauge, second pressure gauge, the first thermometer, second temperature table and other connecting pipes.The different phase in displacement process CT scan core can be carried out simultaneously using the present apparatus and method, by the dividing processing to CT scan image, monitor the distribution of core microscopic remaining oil in core in different conditions carbon dioxide displacement.

Description

The device and method of remaining oil distribution are monitored during carbon dioxide displacement core
Technical field:
The present invention relates to a kind of carbon dioxide drive core microscopic remaining oil Study on spatial distribution devices, and in particular to a kind of The experimental provision of liquid or supercritical carbon dioxide the microscopic remaining oil spatial distribution in core in oil displacement process.
Background technique:
Exist in liquid or the supercritical carbon dioxide displacement of reservoir oil core microscopic remaining oil Study on spatial distribution at present as follows Problem:
It is being driven when for liquid or the supercritical carbon dioxide displacement of reservoir oil carrying out carbon dioxide displacement to reservoir In process, the displacement of different phase displacing medium is under the microscopic remaining oil spatial distribution and different displacement parameters of reservoir The Study on spatial distribution of the microscopic remaining oil of reservoir still belongs to blank stage.And pass through liquid or supercritical carbon dioxide rock core Displacement test, Study on spatial distribution and different carbon dioxide injection Parameters variations for core interior microscopic remaining oil When, how microscopic remaining oil space is distributed research for the different phase carbon dioxide of macroscopical reservoir and different injects in core The distribution research of parameter combination displacement of reservoir oil Spatial Residual oil has important directive significance.At present for liquid or supercriticality two The indoor Physical Experiment research of the carbonoxide displacement of reservoir oil mainly passes through core outlet end carbon dioxide when analysis progress carbon dioxide displacement Gas flow, water displace core inside residual oil content when oil mass ratio analyzes carbon dioxide drive in turn, and note titanium dioxide Influence of the has channeling for recovery ratio when carbon, but do not suggest that a kind of effective method determines different phase carbon dioxide and difference How microscopic remaining oil is distributed in core scale space in core when injection parameter displacement core.Such as: a patent publication No. To disclose a kind of supercritical carbon dioxide drive physical analogue device in the patent application of CN101446189B, which is adopted It is connect with two simulation core devices arranged side by side with injected system, each simulation core device is each provided with one outlet metering system System;Injected system is implanted sequentially water flooding, crude oil and supercritical carbon dioxide to simulation core device, and uses the temperature pressure The pressure and temperature of power TT&C system control whole system is desired setting value, finally passes through mould with outlet metering system measurement The carbon dioxide gas of quasi- coring device, water flooding, the volume of crude oil.The device first by CO2 gas after cooling liquid again Pressurization is warming up to supercriticality, solves the problems, such as injection C02 flow accurate measurement;Using two-tube model, can simulate non- There is fingering and channelling phenomenon in Homogeneous Reservoir CO2 during driving;The device design pressure be 0~40MPa, design temperature be 0~ 180 DEG C, it is mainly used in the researchs such as supercritical CO 2 mixed phase drives or non-phase-mixing driving, continuous gas drive or water-air two-phase flow drive.But the device Can not determine how remaining oil space is distributed in core after carrying out supercritical carbon dioxide displacement, and can not determine in different phases In the case of state, and different carbon dioxide injection parameter combinations, how the microscopic remaining oil in core is distributed.
In addition a patent publication No. is to disclose a kind of judgement carbon dioxide flooding in the patent application of CN105003234A The new method of the new method of oil reservoir has channeling, the judgement carbon dioxide flooding oil reservoir has channeling includes: step 1, compiles carbon dioxide The gas-oil ratio and output air carbon dioxide content of oil reservoirs oil well draw the pass of production gas-oil ratio and output air carbon dioxide content It is plate;Step 2, according to current formation pressure level and oil property, the production gas-oil ratio and output air carbon dioxide are contained The relationship plate of amount is divided into multiple regions;And step 3, the feature in each region is analyzed, judges the production gas-oil ratio and output The upper right comer region of the relationship plate of air carbon dioxide content is the region of carbon dioxide has channeling.But this method equally can not be pre- When surveying progress carbon dioxide displacement, the distributed areas of remaining oil are not employed in reservoir, are not obtained for different gas injection parameters yet In the case of, the distribution of reservoir remaining oil.
Summary of the invention:
In order to solve the technical problems mentioned in the background art, the present invention provides a kind of experimental provision and method, utilizes Microscopic remaining oil space point in the case of the present apparatus and method can be to different phase difference carbon dioxide injection parameters, in core Cloth is studied, and is beneficial to carry out practical oil field the carbon dioxide phase selection of carbon dioxide drive, is realized carbon dioxide flooding Injection parameter is preferred when oily.
The technical scheme is that monitoring the reality of remaining oil distribution in core during this kind of carbon dioxide displacement core Experiment device by the first storage tank, the second storage tank, the first booster pump, the second booster pump, heater, the first cooler, has sealing envelope Every the rock core fastener of device, CT scanner, solid filter, liquid filter, the second cooler, the first control valve, the second control Valve, first pressure gauge, second pressure gauge, the first thermometer, second temperature table and other connecting pipes processed are constituted, unique distinction It is:
The output pipe of first storage tank leads to by two and is connected with the first booster pump entrance pipe, and the first pressurization pumps out The entrance pipe of mouth pipeline and heater connects, and the export pipeline of heater is connect with the entrance pipe of the first cooler, and first The connection of the entrance pipe of the export pipeline of cooler and the seal pack device inside rock core fastener;The first of rock core fastener goes out The entrance pipe of mouth pipeline and solid filter connects, and the export pipeline of solid filter and the entrance pipe of liquid separator connect It connects, the export pipeline of liquid separator is connect with the entrance pipe of the second cooler, the outlet of the second last cooler and Two storage tanks connect to form closed circuit;
Second storage tank is connect with the entrance pipe of the second booster pump, and the export pipeline and core of the second booster pump clamp The confining pressure control entrance connection of device;Seal pack device is used to seal the gap between rock core fastener entrance pipe and core, prevents The leakage of carbon dioxide when carrying out carbon dioxide injection and carrying out core flooding;
The first storage tank dischargeable capacity is more than 15000L, the internal reservoir at least liquid carbon dioxide of 12000L, and second Storage tank dischargeable capacity is more than 15000L, storage inside at least 4000L liquid carbon dioxide;Wherein, the first booster pump is for making two Carbonoxide is pressurized to 7.5MPa, and heater is for heating carbon dioxide to 35 DEG C, and cooler is for being cooled to carbon dioxide Between 25 DEG C;
Rock core fastener is located in the scanning space of CT scanner, to realize in wholly liquid state or above-critical state titanium dioxide During carbon displacement core experiment, the microscopic remaining oil in core when to different injection carbon dioxide PV numbers is monitored.
It is obtained in liquid or supercritical carbon dioxide oil displacement process using experimental provision above-mentioned microcosmic in core The method and step of remaining oil spatial distribution state is as follows:
The first storage tank delivery outlet is led to by two and connects the first control valve inlet, the first control valve controls carbon dioxide The logical of flow pipe stops;
First control valve outlet is connected with the first pressurization pump intake, which is flowed through by the first booster pump Carbon dioxide is pressurized to experimental design pressure 7.5MPa;
First booster pump outlet pipeline is connect with first pressure gauge entrance pipe, increasing is flowed through by first pressure gauge monitoring Pressure needed for whether pressure carbon dioxide meets liquid and the supercritical carbon dioxide simultaneously in pipeline after press pump;
First pressure gauge outlet and calorifier inlets piping connection, are heated to surpassing by heater to the carbon dioxide flowed through 35 DEG C of critical carbon dioxide required temperature, so that the carbon dioxide transitions for flowing through heater are above-critical state;
The outlet of heater is connect with the first temperature table entry, two after heater is adjusted are monitored by the first thermometer Carbonoxide temperature;
The export pipeline of first thermometer is connect with the entrance pipe of the first cooler, is such as driven with supercritical carbon dioxide For core, then the first cooler is closed at this time, if heater is closed at this time with liquid carbon dioxide displacement, the first cooler is beaten It opens;
By the export pipeline of the first cooler and second temperature table entry piping connection, is monitored and flowed out by second temperature table The carbon dioxide temperature of first cooler;
Second temperature table export pipeline is connect with the seal pack device entrance pipe inside rock core fastener, core clamping The export pipeline of device and the entrance pipe of solid filter connect, and the liquid of outflow rock core fastener is filtered by solid filter In solid impurity;
The export pipeline of solid filter and the entrance pipe of liquid filter connect, and are filtered and are flowed out by liquid filter Water phase and oily phase in liquid;
Liquid filter export pipeline is connected into the second cooler entrance pipe, the second cooler cooled carbon dioxide to the Carbon dioxide after cooling is returned to the second storage tank later by the carbon dioxide storage temperature of two storage tanks;
Before starting experiment, after core is put into rock core fastener, the second of the export pipeline of second storage tank Control valve is opened, and the second control valve export pipeline is connect with the second booster pump entrance pipe, the second booster pump outlet pipeline and rock The confining pressure control entrance pipe connection control of core holder will be by the confining pressure of displacement core;
Start to test, different displacement stages during carrying out overcritical or liquid carbon dioxide core flooding, lead to Microscopic remaining oil spatial distribution state in CT scanner real-time monitoring core is crossed, the result after obtaining scanning;
Using acquired CT scan result to liquid and supercritical carbon dioxide and different carbon dioxide injections Under Parameter Conditions, the regularity of distribution of space microscopic remaining oil is studied in core.
The invention has the following beneficial effects: firstly, the present invention is cooling using the first booster pump and heater and first The concatenated combined system of device, independent switch heater and the first cooler are realized that a pipeline can be realized liquid or surpass and are faced Displacement of boundary's state carbon dioxide for experiment core;Secondly, the present invention has been introduced for the first time using CT scan core microscopic remaining oil, It realizes monitoring liquid or the supercritical carbon dioxide carries out the spatial distribution state of the core remaining oil during core flooding; Microscopic remaining oil space point meanwhile in the case of the present invention can be to different phase difference carbon dioxide injection parameter, in core Cloth is studied, to be beneficial to carry out practical oil field the carbon dioxide phase selection of carbon dioxide drive, completes titanium dioxide Injection parameter is preferred when the carbon displacement of reservoir oil.
Detailed description of the invention:
Fig. 1 is structural schematic diagram of the invention.
Fig. 2 is the present invention in application, the comparative diagram in supercritical carbon dioxide displacement stage and CT scan stage.
Fig. 3 is in the specific embodiment of the invention, the CT scan result figure that when carbon dioxide injection amount 0PV obtains.
Fig. 4 is in the specific embodiment of the invention, the CT scan result figure that when carbon dioxide injection amount 0.5PV obtains.
Fig. 5 is in the specific embodiment of the invention, the CT scan result figure that when carbon dioxide injection amount 1PV obtains.
Fig. 6 is in the specific embodiment of the invention, the CT scan result figure that when carbon dioxide injection amount 2PV obtains
Specific embodiment:
The present invention will be further explained below with reference to the attached drawings:
As shown in Figure 1, the experimental provision that remaining oil distribution in core is monitored during this kind of carbon dioxide displacement core, by First storage tank 1, the first booster pump 3, the second booster pump 4, heater 5, the first cooler 6, has seal pack at second storage tank 2 Rock core fastener 7, CT scanner 9, solid filter 10, liquid filter 11, the second cooler 12, the first control valve of device 8 13, the second control valve 14, first pressure gauge 15, second pressure gauge 16, the first thermometer 17, second temperature table 18 and other connections Pipe fitting is constituted, and is unique in that:
The output pipe of first storage tank 1 leads to by two and is connected with 3 entrance pipe of the first booster pump, the first booster pump 3 export pipelines are connect with the entrance pipe of heater 5, and the entrance pipe of the export pipeline of heater 5 and the first cooler 6 connects It connects, the entrance pipe connection of the export pipeline of the first cooler 6 and the seal pack device 8 inside rock core fastener;Core clamping The first outlet pipeline of device 7 is connect with the entrance pipe of solid filter 10, the export pipeline and liquid point of solid filter 10 Entrance pipe connection from device 11, the export pipeline of liquid separator 11 are connect with the entrance pipe of the second cooler 12, finally, The outlet and the second storage tank of second cooler 12,2 connections form closed circuit;
Second storage tank 2 is connect with the entrance pipe of the second booster pump 4, the export pipeline and core of the second booster pump 4 The confining pressure control entrance connection of clamper 7;Seal pack device 8 is used to seal the seam between 7 entrance pipe of rock core fastener and core Gap prevents the leakage of the carbon dioxide when carrying out carbon dioxide injection and carrying out core flooding;
First storage tank, 1 dischargeable capacity is more than 15000L, the internal reservoir at least liquid carbon dioxide of 12000L, and second 2 dischargeable capacity of storage tank is more than 15000L, storage inside at least 4000L liquid carbon dioxide;Wherein, the first booster pump 3 is for making Carbon dioxide is pressurized to 7.5MPa, and heater 5 is for heating carbon dioxide to 35 DEG C, and cooler 6 is for keeping carbon dioxide cold But between 25 DEG C;
Rock core fastener 7 is located in the scanning space of CT scanner 9, to realize in wholly liquid state or above-critical state dioxy During changing carbon displacement core experiment, the microscopic remaining oil in core when to different injection carbon dioxide PV numbers is supervised It surveys.
The example for carrying out the experiment of carbon dioxide displacement core microscopic remaining oil distribution using the present invention is given below:
The concrete function in application, all parts is provided first:
First storage tank has stored the liquid carbon dioxide of enough progress core floodings.
Second storage tank stores the liquid carbon dioxide of 1/4 volume of tank capacity, for being to displacement before core flooding experiment The confining pressure of core provides power fluid, meanwhile, for storing the carbon dioxide after recycling displacement.
The carbon dioxide that first booster pump is used to flow through the booster pump is pressurized to while meeting liquid and supercritical state two Pressure needed for carbonoxide.
Second booster pump is used for the carbon dioxide pressurization for making to flow out from the second storage tank, for controlling enclosing by displacement core Pressure.
Heater is used to make from the carbon dioxide liter degree for being pressurized to 8MPa that the first booster pump flows out to overcritical titanium dioxide 35 DEG C of design temperature needed for carbon, the carbon dioxide after heater heating form supercriticality.
First cooler is used to carry out in liquid carbon dioxide core flooding experiment to flowing through the dioxy after the first booster pump Change carbon, which is cooled to, meets 25 DEG C of liquid carbon dioxide design temperature, and carbon dioxide after cooling forms liquid carbon dioxide.
Rock core fastener is used to place the core of pending liquid and supecritical state displacement.
Seal pack device is used to seal the gap between rock core fastener 7 and core, prevents from carrying out carbon dioxide injection progress The leakage of carbon dioxide when rock core displacement.
CT scanner is used for real-time monitoring in different carbon dioxide injection PV numbers, the microscopic remaining oil in displacement core Distribution.
Solid filter is used to carry out the unpurified carbon dioxide flowed out the filtering of solid from displacement core.
Liquid filter is used to carry out liquid impurity to the carbon dioxide of the removing solid impurity flowed out from solid filter Separation.
Second cooler is for carrying out the carbon dioxide flowed out from liquid separator to be cooled to the second storage tank of carbon dioxide Temperature.
First control valve is used to control logical the stopping on carbon dioxide displacement experiment tube road.
Second control valve is used to control the confining pressure of experiment core.
First pressure gauge for monitor flow through the pressurized carbon dioxide of the first booster pump whether and meanwhile meet liquid and surpass The pressure of critical state carbon dioxide.
Second pressure is for monitoring that the confining pressure for whether reaching core through the pressurized pressure carbon dioxide of the second booster pump is set Count pressure.
First thermometer is used to monitor whether the carbon dioxide temperature for flowing through heater meets needed for supercritical carbon dioxide Temperature.
Second temperature table is used to monitor whether the carbon dioxide temperature for flowing through the first cooler meets liquid carbon dioxide institute The temperature needed
Specific steps are given below:
Step 1: before experiment starts, acquire from the core diameter of certain actual reservoir be 2.54cm, the length that length is 120cm After core is put into rock core fastener 7, the control valve 14 between the export pipeline of the storage tank 2 and the second booster pump 4 is beaten It opens, the carbon dioxide in storage tank 2 flows to booster pump 4, and it is current that the liquid carbon dioxide flowed through is forced into actual reservoir by booster pump 4 Strata pressure 15MPa for controlling by the confining pressure of displacement core, while observing the pressure change of second pressure gauge 16, to pressure Stabilization can carry out subsequent process steps in 15MPa.
Step 2: 1 delivery outlet of storage tank being led to by two and connects 13 entrance of the first control valve, and the control of the first control valve 13 is super to face Boundary's carbon dioxide core flooding pipeline is shut down, and the outlet of the first control valve 13 is connected with 3 entrance of the first booster pump, the first pressurization (carbon dioxide is greater than pressure needed for the carbon dioxide that pump 3 flows through the booster pump is pressurized to supercritical state carbon dioxide in pressure 7.38MPa, temperature form supercriticality when being higher than 31.2 DEG C), in order to overcome pipeline friction loss, this first pressurization of experiment The carbon dioxide that pump 3 flows through the booster pump is pressurized to 7.5MPa, and pressurized carbon dioxide is from 3 export pipeline of the first booster pump 15 entrance pipe of first pressure gauge is flowed through, pressure carbon dioxide is first pressure gauge 15 in pipeline after booster pump is pressurized for monitoring No to reach experimental design pressure 7.5MPa, the carbon dioxide for meeting supercritical carbon dioxide pressure goes out from first pressure gauge 15 Mouth pipeline flows through 5 entrance pipe of heater, and heater 5 heats the carbon dioxide for meeting supercritical carbon dioxide pressure flowed through To supercritical carbon dioxide required temperature is met, (carbon dioxide is greater than 7.38MPa in pressure, and temperature forms super when being higher than 31.2 DEG C Critical state), while considering that pipeline spreads the temperature of carbon dioxide, therefore 5 heating temperature of heater is adjusted to 35 DEG C, finally The carbon dioxide transitions for flowing through heater 5 are above-critical state.The outlet of heater 5 is connect with 17 entrance of the first thermometer, the first temperature Whether the carbon dioxide temperature that degree table 17 is used to monitor after heater 5 is adjusted meets the temperature requirement of supercritical carbon dioxide, the One thermometer, 17 export pipeline is connect (cooler closing at this time) with the entrance pipe of cooler 6, cooler outlet and the second temperature The connection of 18 entrance pipe of table is spent, second temperature table 18 is for monitoring whether outflow cooler carbon dioxide temperature variation meets super face The temperature requirement of boundary's carbon dioxide meets supercritical carbon dioxide from 18 export pipeline of second temperature table and flows into core folder Supercritical carbon dioxide displacement, seal pack are carried out to the core in rock core fastener 7 after seal pack device 8 inside holder 7 Device 8 is used to seal the gap between the entrance and core of rock core fastener 7, prevents from carrying out note supercritical carbon dioxide progress core The leakage of supercritical carbon dioxide in displacement process, the export pipeline of rock core fastener 7 and the entrance pipe of solid filter 10 Connection, solid filter 10 are used to filter the solid impurity in outflow rock core fastener mixing liquid, and solid filter 10 goes out Mouth pipeline is connect with the entrance pipe of liquid filter 11, and liquid filter filters the carbon dioxide flowed out from solid filter 10 In oil mutually and water phase, remove liquid impurity.11 export pipeline of liquid filter connects 12 entrance pipe of cooler, and cooler is cold But storage tank 2 is returned from the carbon dioxide that liquid filter 11 flows out to the carbon dioxide storage temperature of storage tank 2.
Step 3: in the process for carrying out supercritical carbon dioxide displacement to test core above, pass through GE Light 8 medical multilayer X-ray CT scanner of Speed, respectively injection supercritical carbon dioxide 0PV volume, 0.5PV volume, 1PV volume, The micro Distribution figure of its remaining oil is monitored when 2PV volume by CT scanner, monitors flow time point and supercritical carbon dioxide Displacement time point correspondence is as shown in Fig. 2.
Step 4: by 8 medical multilayer X-ray CT scanner of GE Light Speed to test core intermediate cross-section at, Time segment fixed point is carried out when injecting supercritical carbon dioxide volume and being 0PV, 0.5PV, 1PV, 2PV respectively to scan, final To the intermediate cross-section microscopic remaining oil distribution figure of experiment rock core, as shown in attached drawing 3- attached drawing 6, as can be seen from Figure overcritical two Carbonoxide to saturated oils core carry out displacement when, due to have extremely low interfacial tension between supercritical carbon dioxide and crude oil with And very superior mass transfer performances, therefore, the remaining oil distribution in supercritical carbon dioxide displacement core is more uniform, without because heterogeneous And the remaining oil enrichment region of the large area formed.
In carrying out the present invention it should be noted that following problems:
There are four types of existences for carbon dioxide: gaseous state, liquid, solid-state, above-critical state are influenced, titanium dioxide by temperature, pressure The carbon dioxide flowed out in carbon storage tank while meeting liquid and above-critical state two when reaching 7.5MPa by force (forcing) pump pressurization The pressure of carbonoxide, carbon dioxide after pressurization temperature be more than 31.2 DEG C be changing to above-critical state/0 DEG C~31.2 DEG C it Between be changing to liquid, the carbon dioxide for becoming liquid or above-critical state enters core flooding crude oil, while passing through CT scan Instrument carries out CT scan to the core of different injection PV number carbon dioxide, and then analyzes microscopic remaining oil distribution in core.Injection PV number is the multiple for injecting core void volume, and the carbon dioxide for injecting 0.5PV, which injects in core, is equivalent to core hole 0.5 times of gap volume.

Claims (2)

1. monitor the experimental provision of remaining oil distribution in core during a kind of carbon dioxide displacement core, by the first storage tank (1), Second storage tank (2), the second booster pump (4), heater (5), the first cooler (6), has seal pack at the first booster pump (3) Rock core fastener (7), CT scanner (9), solid filter (10), the liquid filter (11), the second cooler of device (8) (12), the first control valve (13), the second control valve (14), first pressure gauge (15), second pressure gauge (16), the first thermometer (17), second temperature table (18) and other connecting pipes are constituted, it is characterised in that:
The output pipe of first storage tank (1) leads to by two and is connected with the first booster pump (3) entrance pipe, the first booster pump (3) export pipeline is connect with the entrance pipe of heater (5), the export pipeline of heater (5) and the entrance of the first cooler (6) The entrance pipe of piping connection, the export pipeline of the first cooler (6) and the seal pack device (8) inside rock core fastener connects It connects;The first outlet pipeline of rock core fastener (7) is connect with the entrance pipe of solid filter (10), solid filter (10) Export pipeline is connect with the entrance pipe of liquid separator (11), the export pipeline and the second cooler of liquid separator (11) (12) entrance pipe connection, the outlet of the second last cooler (12) connect to form closed circuit with the second storage tank (2);
Second storage tank (2) connect with the entrance pipe of the second booster pump (4), the export pipeline and rock of the second booster pump (4) The confining pressure control entrance connection of core holder (7);Seal pack device (8) is for sealing rock core fastener (7) entrance pipe and rock Gap between core prevents the leakage of the carbon dioxide when carrying out carbon dioxide injection and carrying out core flooding;
First storage tank (1) dischargeable capacity is more than 15000L, the internal reservoir at least liquid carbon dioxide of 12000L, the second storage Tank (2) dischargeable capacity is more than 15000L, storage inside at least 4000L liquid carbon dioxide;Wherein, the first booster pump (3) is used for Carbon dioxide is set to be pressurized to 7.5MPa, heater (5) is for heating carbon dioxide to 35 DEG C, and cooler (6) is for making dioxy Change carbon to be cooled between 25 DEG C;
Rock core fastener (7) is located in the scanning space of CT scanner (9), to realize in wholly liquid state or above-critical state dioxy During changing carbon displacement core experiment, the microscopic remaining oil in core when to different injection carbon dioxide PV numbers is supervised It surveys.
2. a kind of obtained in liquid or supercritical carbon dioxide oil displacement process using experimental provision described in claim 1 The method of microscopic remaining oil spatial distribution state, this method are made of following steps in core:
First storage tank (1) delivery outlet is led to by two and connects the first control valve (13) entrance, the first control valve (13) control The logical of carbon dioxide stream passes pipeline stops;
First control valve (13) are exported and are connected with the first booster pump (3) entrance, which is flowed through by the first booster pump (3) The carbon dioxide of press pump is pressurized to experimental design pressure 7.5MPa;
First booster pump (3) export pipeline is connect with 15 entrance pipe of first pressure gauge, is monitored by first pressure gauge (15) In pipeline after flowing through booster pump pressure carbon dioxide whether and meanwhile pressure needed for meeting liquid and the supercritical carbon dioxide;
First pressure gauge (15) outlet is connect with heater (5) entrance pipe, is added by heater (5) to the carbon dioxide flowed through Heat is to 35 DEG C of supercritical carbon dioxide required temperature, so that the carbon dioxide transitions for flowing through heater are above-critical state;
The outlet of heater (5) is connect with the first thermometer (17) entrance, monitors heater (5) by the first thermometer (17) Carbon dioxide temperature after adjusting;
The export pipeline of first thermometer (17) is connect with the entrance pipe of the first cooler (6), such as with overcritical titanium dioxide Carbon displacement core, then the first cooler (6) is closed at this time, if heater (5) is closed at this time with liquid carbon dioxide displacement, the One cooler (6) is opened;
The export pipeline of first cooler (6) is connect with second temperature table (18) entrance pipe, is passed through second temperature table (18) The carbon dioxide temperature of monitoring the first cooler of outflow;
Second temperature table (18) export pipeline is connect with seal pack device (8) entrance pipe inside rock core fastener 7, core The export pipeline of clamper (7) is connect with the entrance pipe of solid filter (10), is filtered and is flowed out by solid filter (10) Solid impurity in the liquid of rock core fastener (7);
The export pipeline of solid filter (10) is connect with the entrance pipe of liquid filter (11), is passed through liquid filter (11) Filter the water phase and oily phase in efflux;
Liquid filter (11) export pipeline is connected into the second cooler (12) entrance pipe, the cooling dioxy of the second cooler (12) Change the carbon dioxide storage temperature of carbon to the second storage tank (2), carbon dioxide after cooling is returned into the second storage tank (2) later;
Before starting experiment, after core is put into rock core fastener (7), the export pipeline second of second storage tank (2) Control valve (14) is opened, and the second control valve (14) export pipeline is connect with the second booster pump (4) entrance pipe, the second booster pump (4) the confining pressure control entrance pipe of export pipeline and rock core fastener (7) connect that control will be by the confining pressure of displacement core;
Start to test, in different displacement stages during carrying out overcritical or liquid carbon dioxide core flooding, passes through CT Microscopic remaining oil spatial distribution state in scanner (9) real-time monitoring core, the result after obtaining scanning;
Using acquired CT scan result to liquid and supercritical carbon dioxide and different carbon dioxide injection parameters Under the conditions of, the regularity of distribution of space microscopic remaining oil is studied in core.
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