CN108458957B - Device and method for simulating water rock reaction - Google Patents
Device and method for simulating water rock reaction Download PDFInfo
- Publication number
- CN108458957B CN108458957B CN201710093415.1A CN201710093415A CN108458957B CN 108458957 B CN108458957 B CN 108458957B CN 201710093415 A CN201710093415 A CN 201710093415A CN 108458957 B CN108458957 B CN 108458957B
- Authority
- CN
- China
- Prior art keywords
- reaction
- fluid
- reaction kettle
- rock
- scanning
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 182
- 239000011435 rock Substances 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 239000012530 fluid Substances 0.000 claims abstract description 78
- 238000002591 computed tomography Methods 0.000 claims abstract description 33
- 238000012360 testing method Methods 0.000 claims abstract description 32
- 239000011148 porous material Substances 0.000 claims abstract description 29
- 238000002347 injection Methods 0.000 claims abstract description 27
- 239000007924 injection Substances 0.000 claims abstract description 27
- 238000004458 analytical method Methods 0.000 claims abstract description 25
- 230000003993 interaction Effects 0.000 claims abstract description 17
- 238000009792 diffusion process Methods 0.000 claims abstract description 15
- 238000012545 processing Methods 0.000 claims abstract description 14
- 238000003384 imaging method Methods 0.000 claims abstract description 10
- 239000000243 solution Substances 0.000 claims description 59
- 239000000700 radioactive tracer Substances 0.000 claims description 43
- 238000003860 storage Methods 0.000 claims description 29
- 239000007788 liquid Substances 0.000 claims description 15
- 239000008367 deionised water Substances 0.000 claims description 12
- 229910021641 deionized water Inorganic materials 0.000 claims description 12
- 238000005485 electric heating Methods 0.000 claims description 11
- -1 polytetrafluoroethylene Polymers 0.000 claims description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 4
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 3
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 3
- 239000004917 carbon fiber Substances 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 3
- 229920002530 polyetherether ketone Polymers 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 16
- 238000012544 monitoring process Methods 0.000 abstract description 14
- 238000002474 experimental method Methods 0.000 abstract description 6
- 238000011065 in-situ storage Methods 0.000 abstract description 5
- 238000004364 calculation method Methods 0.000 abstract description 3
- 150000002500 ions Chemical class 0.000 description 31
- 230000008859 change Effects 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910002804 graphite Inorganic materials 0.000 description 5
- 239000010439 graphite Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 4
- 239000011575 calcium Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000012805 post-processing Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 229910001415 sodium ion Inorganic materials 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 229910000856 hastalloy Inorganic materials 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical group 0.000 description 1
- 238000009616 inductively coupled plasma Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The invention relates to a device for simulating water-rock reaction and a method for simulating water-rock reaction by using the device. The device comprises: a micro CT scanning system; a reaction kettle arranged in the micro CT scanning system; a fluid injection system connected to the inlet of the reaction vessel; a fluid ion test analysis system connected with the outlet of the reaction kettle; and the data acquisition and processing system is used for acquiring data in the miniature CT scanning system and the fluid ion test analysis system. The device can monitor the dynamic process of water rock reaction, realizes the real-time in-situ imaging monitoring of water rock reaction, and the parameters such as diffusion distribution trend, saturation distribution of real-time monitoring fluid among the pores have important scientific significance for monitoring the reaction progress of a water rock reaction experiment system and exploring fluid rock interaction rules. In addition, the method can simultaneously complete imaging and quantitative calculation, has high real-time on-line monitoring degree, and is convenient to apply and popularize.
Description
Technical Field
The invention belongs to the technical field of water-rock reaction processes, and particularly relates to a device and a method for simulating water-rock reaction.
Background
The primary pores of carbonate rock and the secondary pores formed by erosion in the earth's surface and during the burial process are important oil and gas storage spaces. Fluid rock interactions in deep hydrocarbon-bearing carbonate reservoirs are important factors affecting reservoir performance. Fluid rock interaction comprises two processes of erosion and precipitation, wherein erosion enlarges pores to improve rock storage performance, and precipitation reduces pores to reduce rock storage performance. Rock is used as a porous medium, and the problems of influence degree of development scale and spatial distribution of internal pore space on fluid seepage, interaction mechanism of fluid and rock, material change and energy change in the interaction process and the like need to be found out by carrying out deep simulation experiments.
The existing water rock chemical reaction device is mainly used for carrying out an acidification experiment on a rock core sample or a particle sample by adopting a flow method, the particle rock sample or the rock core sample is assembled in a reaction kettle, and the reaction process is calculated and speculated through the shape change, the structural composition change and the solution ion component change of the rock sample after reaction. The device and the method have certain hysteresis quality and indirection, can not directly monitor the reaction process of water rock reaction, and can not dynamically observe the diffusion process of fluid in the rock sample.
The core CT scanning technology is that a reservoir core sample is scanned through CT to obtain a static two-dimensional section scanning image of the reservoir core, and the two-dimensional image is converted into a core three-dimensional solid model by means of certain modeling work and simulation calculation. The method is mainly applied to a static process at present, a digitalized and visualized object is a core sample before or after modification, and the change conditions of internal pores and fluid of the core in the modification process cannot be known.
There is therefore a need for an apparatus for simulating and reproducing fluid rock interaction processes for formation conditions that provides an effective means for reservoir modification and prediction.
Disclosure of Invention
The invention aims to solve the technical problem of providing a device for simulating water-rock reaction aiming at the defects of the prior art, which can monitor the reaction progress of the water-rock reaction in situ in real time, visualize the dynamic process of fluid passing through a porous medium and simulate and reproduce the process of fluid-rock interaction under stratum conditions.
The invention also provides a method for simulating the water-rock reaction, which can monitor parameters such as diffusion distribution trend, saturation distribution and the like of the fluid among pores in real time and has important scientific significance for monitoring the reaction progress of a water-rock reaction system and exploring the fluid-rock interaction rule.
To this end, a first aspect of the invention provides a device for simulating water rock reactions, comprising:
a micro CT scanning system;
a reaction kettle arranged in the micro CT scanning system;
a fluid injection system connected to the inlet of the reaction vessel;
a fluid ion test analysis system connected with the outlet of the reaction kettle; and
and the data acquisition and processing system is used for acquiring data in the micro CT scanning system and the fluid ion test analysis system.
According to the invention, the data acquisition and processing system is respectively connected with the micro CT scanning system and the fluid ion testing and analyzing system through electric connection.
In some embodiments of the invention, the reaction kettle is covered with an electric heating ring sleeve, and the electric heating ring sleeve is connected with the electric control temperature regulator through a lead.
In other embodiments of the invention, the fluid injection system comprises CO connected to the first inlet of the reaction vessel2A solution injection system; and a tracer solution injection system connected to the second inlet of the reactor.
In some embodiments of the invention, the CO is2The solution injection system includes:
CO connected with the first inlet of the reaction kettle2A gas cylinder; and
in connection with the CO2The gas cylinder and a first stop valve, a first pressure gauge, a deionized water storage tank, a first constant-pressure constant-flow pump and a second stop are sequentially arranged on a pipeline at a first inlet of the reaction kettleThe system comprises a valve, a first preheater, a first thermocouple and a second pressure gauge;
the tracer solution injection system includes:
a tracer liquid storage tank connected with a second inlet of the reaction kettle; and
and the tracer liquid storage tank, the second constant-pressure constant-flow pump, the third stop valve, the second preheater, the second thermocouple and the third pressure gauge are sequentially arranged on a pipeline connecting the tracer liquid storage tank and the second inlet of the reaction kettle.
In some embodiments of the invention, a third thermocouple, a fourth pressure gauge and a fourth stop valve are arranged on a pipeline from the outlet of the reaction kettle to the fluid ion test analysis system in sequence.
According to the invention, the reaction vessel is a cylindrical hollow vessel; and/or the reaction kettle is made of one or more of polyether-ether-ketone, polytetrafluoroethylene and carbon fiber.
In a second aspect the present invention provides a method of simulating water rock reactions using an apparatus according to the first aspect of the invention, comprising the steps of:
a, scanning pure air in a reaction kettle by using a micro CT scanning system, then scanning pure water in the reaction kettle, and then scanning a standard core sample to obtain CT reference data for determining porosity distribution;
b, putting the dried rock core sample to be tested into a reaction kettle, and scanning by using a micro CT system to obtain a pore structure inside the rock core sample to be tested;
c, reacting CO at the temperature and pressure required by the reaction2Preheating the solution and the tracer solution, pumping the preheated solution and the tracer solution into a reaction kettle, and starting reaction timing;
CT scanning is carried out at fixed time intervals to obtain CO at different moments2CT data of distribution forms of the solution and the tracer solution in the pores of the core sample to be tested; the fluid after reaction enters a fluid ion test analysis system, and the fluid ion test analysis system is utilized to obtain ion concentration data in the fluid at different moments;
d, finishing the reaction after the reaction is carried out for a set time; CT data and ion concentration data acquired in the whole reaction process are processed by a data acquisition and processing system.
According to the invention, based on the different moments of CO obtained2The CT data of the distribution form of the solution in the pores of the core sample to be tested are obtained by adopting a saturation difference method to obtain the porosity distribution of the core sample to be tested; imaging a fluid traveling path, a diffusion distribution trend and saturation distribution based on the acquired CT data of the distribution form of the tracer solution in the pores of the core sample to be tested at different moments; and obtaining the ion product variation trend in the device based on the obtained ion concentration data in the reacted fluid, calculating the reaction rate and the integral diffusion coefficient, and evaluating the relationship between the fluid rock interaction degree and the porosity distribution.
In some embodiments of the invention, the tracer is NaI.
The invention has the beneficial effects that: the device provided by the invention can monitor the dynamic process of the water-rock reaction, realizes real-time in-situ imaging monitoring of the water-rock reaction, can be applied to rock samples with different lithologies in an expanded manner, researches the spatial migration rule of the fluid in the water-rock reaction process, monitors the parameters such as the diffusion distribution trend and saturation distribution of the fluid among pores in real time, and has important scientific significance for monitoring the reaction progress of a water-rock reaction experiment system and exploring the fluid-rock interaction rule. In addition, the method can simultaneously complete imaging and quantitative calculation, has high real-time on-line monitoring degree, and is convenient to apply and popularize.
Drawings
The invention will be explained below with reference to the drawings.
FIG. 1 is a schematic diagram of an apparatus for simulating water rock reactions used in an embodiment of the present invention; the reference numerals in the figures have the following meanings: 1, a micro CT system; 2, a reaction kettle; 201 a first inlet of the reaction kettle; 202 a second inlet of the reaction kettle; 203, an outlet of the reaction kettle; 204 graphite electric heating ring sleeve; 205 electrically controlling a temperature regulator; 301CO2A gas cylinder; 302 a first shut-off valve; 303 a first pressure gauge; 304 deionized water storage tank; 305 a first constant pressure constant flow pump; 306 a second shut-off valve; 307 a first preheater; 308 a first thermocouple; 309 a second pressure gauge; 310NaI liquid storage tank(ii) a 311 a second constant pressure and constant flow pump; 312 a third stop valve; 313 a second preheater; 314 second thermocouple; 315 a third pressure gauge; 4 a fluid ion test analysis system; 401 a third thermocouple; 402 a fourth pressure gauge; 403 a fourth stop valve; 404 a fifth stop valve; 5, a data acquisition and processing system.
Detailed Description
In order that the invention may be readily understood, a detailed description of the invention is provided below.
As mentioned above, the existing water-rock chemical reaction device cannot dynamically observe the diffusion process of fluid in the rock sample, and cannot acquire the change condition of the internal pore space of the rock core and the fluid in the process of reservoir transformation.
The inventor finds that the core CT scanning technology is combined with a water-rock chemical reaction device, the reaction progress of water-rock reaction is monitored in situ in real time through a tracer, the dynamic process of fluid passing through a porous medium in the water-rock reaction process can be visualized, the process of fluid-rock interaction under stratum conditions is simulated and reproduced, the degree of fluid-rock interaction and control factors are measured on the pore scale, and an effective means is provided for reservoir reconstruction and prediction. The invention is based on the above method.
To this end, an aspect of the present invention relates to an apparatus for simulating water rock reaction, comprising:
a micro CT scanning system;
a reaction kettle arranged in the micro CT scanning system;
a fluid injection system connected to the inlet of the reaction vessel;
a fluid ion test analysis system connected with the outlet of the reaction kettle; and
and the data acquisition and processing system is used for acquiring data in the micro CT scanning system and the fluid ion test analysis system.
According to the invention, the data acquisition and processing system is respectively connected with the micro CT scanning system and the fluid ion testing and analyzing system through electric connection.
In the invention, the micro CT scanning system is designed in an annular shape, has small volume and is matched with the size of a reaction kettle.
In some embodiments of the invention, the reaction vessel is in the shape of a cylindrical hollow vessel; the material of reation kettle is one or more in polyetheretherketone, polytetrafluoroethylene and the carbon fiber, and these macromolecular material's intensity is high, acid and alkali corrosion resistance, high temperature resistant, can satisfy the resistant high-temperature and high-pressure experiment requirement of reation kettle, and the nonmetal characteristic of reation kettle material can guarantee going on smoothly of CT scanning in addition.
In other embodiments of the present invention, an electric heating ring sleeve is wrapped outside the reaction kettle, the electric heating ring sleeve is connected to an electric temperature controller through a lead, and the electric temperature controller controls the temperature inside the reaction kettle by adjusting the temperature of the electric heating ring sleeve; in some embodiments of the invention, the electrically heated collar is a graphite electrically heated collar.
In the present invention, the fluid injection system comprises CO connected to the first inlet of the reaction vessel2A solution injection system; and a tracer solution injection system connected to the second inlet of the reactor.
In some embodiments of the invention, the CO is2The solution injection system includes: CO connected with the first inlet of the reaction kettle2A gas cylinder; and in connection with the CO2The pipeline of the gas cylinder and the first inlet of the reaction kettle is sequentially provided with a first stop valve, a first pressure gauge, a deionized water liquid storage tank, a first constant-pressure constant-flow pump, a second stop valve, a first preheater, a first thermocouple and a second pressure gauge;
in CO2Solution injection system, CO2The gas and the deionized water are mixed in proportion in a deionized water storage tank, pumped into a first preheater for heating through a first constant-pressure constant-flow pump, and then injected into a reaction kettle for reacting with a rock core sample.
In other embodiments of the present invention, the tracer solution injection system comprises:
a tracer liquid storage tank connected with a second inlet of the reaction kettle; the tracer liquid storage tank, the second constant-pressure constant-flow pump, the third stop valve, the second preheater, the second thermocouple and the third pressure gauge are sequentially arranged on a pipeline connecting the tracer liquid storage tank and the second inlet of the reaction kettle; the tracer solution is pumped into a second preheater from a tracer liquid storage tank through a second constant-pressure constant-flow pump for heating, and then is injected into the reaction kettle; specifically, the tracer is NaI.
In some embodiments of the invention, a third thermocouple, a fourth pressure gauge and a fourth stop valve are arranged on a pipeline from the outlet of the reaction kettle to the fluid ion test analysis system in sequence.
In the apparatus of the invention, in CO2Gas injection port, CO2The first pressure gauge, the second pressure gauge, the third pressure gauge and the fourth pressure gauge are respectively assembled at a first inlet of the reaction kettle for the solution to enter, a second inlet of the reaction kettle for the tracer solution to enter and an outlet of the reaction kettle for monitoring the pressure of the reaction device in the reaction process; the first thermocouple, the second thermocouple and the third thermocouple are respectively arranged at the first inlet of the reaction kettle, the second inlet of the reaction kettle and the outlet of the reaction kettle and are used for monitoring the temperature of the reaction device in the reaction process.
In the invention, the deionized water storage tank, the tracer storage tank and the pipeline in the device are all made of Hastelloy with high temperature resistance, high pressure resistance and acid resistance.
A second aspect of the invention relates to a method of simulating a water-rock reaction using a device according to the first aspect of the invention, comprising the steps of:
(1) debugging before experiment: connecting pipelines, introducing pure water into the whole reaction device, increasing the temperature and the pressure, testing the sealing performance of the reaction device, then opening the micro CT scanning system to scan the reaction kettle, checking images and eliminating artifacts; testing a fluid ion test analysis system;
(2) reference data acquisition: firstly, scanning pure air in a reaction kettle by using a micro CT scanning system, then scanning the pure water in the reaction kettle, and then scanning a standard core sample to obtain data serving as CT reference data for determining porosity distribution; loading the dried rock core sample to be tested into a reaction kettle, and scanning by using a micro CT system to obtain a pore structure inside the rock core sample to be tested;
(3) reaction initiation: opening of CO2A first stop valve of the gas cylinder,introducing CO2Introducing gas into a deionized water storage tank to obtain CO with a certain concentration2A solution;
the pressure of the reaction device is regulated by the first constant-pressure constant-flow pump and the second constant-pressure constant-flow pump; monitoring the pressure of the reaction device to reach a reaction set pressure through a first pressure gauge, a second pressure gauge, a third pressure gauge and a fourth pressure gauge; the temperature of the reaction device is monitored to reach the reaction set temperature through the first thermocouple, the second thermocouple and the third thermocouple;
after the temperature and the pressure are stable, the CO is respectively pumped into the deionized water liquid storage tank by the first constant-pressure constant-flow pump and the second constant-pressure constant-flow pump2Solution and tracer solution, CO, in a tracer reservoir2The solution and the tracer solution are respectively preheated by a first preheater and a second preheater on a pipeline and then pumped into a reaction kettle, and the reaction is started to time;
CT scanning is carried out at fixed time intervals, and CO at different moments is obtained through a micro CT system2The CT data (two-dimensional core section image data) of the distribution form of the solution and the tracer solution in the pores of the core sample to be tested can display CO by the obtained CT image data2Change in solution density, CO as tracer diffuses2The trend of the solution density change is imaged; the fluid after reaction enters a fluid ion test analysis system to continuously monitor ions (Ca) in the fluid at different moments on line2+With Mg2+Etc.) concentration data;
after the reaction is carried out for a set time, the reaction is finished; CT data and ion concentration data acquired in the whole reaction process are processed by a data acquisition and processing system;
(4) and (3) data post-processing: CO at different times based on acquisition2The CT data of the distribution form of the solution in the pores of the core sample to be tested are obtained by adopting a saturation difference method to obtain the porosity distribution of the core sample to be tested; imaging a fluid advancing path, a diffusion distribution trend and saturation distribution based on the acquired CT data of the distribution form of the tracer solution in the pores of the core sample to be tested at different moments; based on separation in the captured post-reaction fluidAnd (3) acquiring sub-concentration data, obtaining the ion product variation trend in the device, calculating the reaction rate and the overall diffusion coefficient, and evaluating the relationship between the fluid rock interaction degree and the porosity distribution.
In some specific embodiments of the invention, the tracer is NaI, and added NaI can visualize NaI molecules along with the flow path and diffusion distribution of fluid in the pores of the core sample under the action of X-rays of a CT device, and can observe the influence degree and action rule of flow rate, different fluids, different porosities, and different lithologies on the water-rock reaction dissolution-precipitation process.
The method utilizes the CT scanning technology, can monitor the reaction progress of the water-rock reaction in real time in an in-situ imaging manner, visualizes the dynamic process of the water-rock process fluid passing through a porous medium, quantificationally calculates the reaction rate, diffusion coefficient and saturation of the water-rock reaction, and measures the degree of the fluid-rock interaction and control factors from the pore scale. By means of the tracing effect of the tracer NaI under the X-ray of the CT equipment, the water-rock reaction process can be visualized in an imaging mode, the space migration rule of fluid passing through rock cores with different porosities is determined, and the characteristics and modes of interaction between different fluids and rocks are cleared. The fluid ion monitoring analysis can also monitor the dissolution rule of different ions in the reaction fluid along with the reaction process in real time, and can be used for calculating the reaction rate, the reaction series and the saturation index and determining the reaction kinetic mechanism of the water-rock reaction under different conditions.
Examples
In order that the invention may be more readily understood, the invention will now be described in further detail with reference to the accompanying drawings and examples, which are given by way of illustration only and are not limiting to the scope of the invention. The starting materials or components used in the present invention may be commercially or conventionally prepared unless otherwise specified.
FIG. 1 is a schematic diagram of an apparatus for simulating water rock reactions used in an embodiment of the present invention; as shown in fig. 1, the reaction apparatus comprises: the system comprises a micro CT scanning system 1, a reaction kettle 2 arranged in the micro CT scanning system, a fluid injection system connected with an inlet of the reaction kettle, and a fluid ion test analysis system 4 connected with an outlet of the reaction kettle; and a data acquisition and processing system 5 for acquiring data in the micro CT scanning system 2 and the fluid ion test analysis system 4; the data acquisition and processing system 5 is respectively connected with the micro CT scanning system 2 and the fluid ion testing and analyzing system 5 through electric connection.
The reaction kettle 2 is covered with a graphite electric heating ring sleeve 204, and the graphite electric heating ring sleeve 204 is connected with an electric control temperature regulator 205 through a lead.
The fluid injection system comprises CO connected to the first inlet 201 of the reaction vessel2A solution injection system; and a tracer solution injection system coupled to the second inlet 202 of the reaction vessel.
Said CO2The solution injection system includes:
CO connected to the first inlet 201 of the reactor2 A gas cylinder 301; and in connection with the CO2A first stop valve 302, a first pressure gauge 303, a deionized water storage tank 304, a first constant-pressure constant-flow pump 305, a second stop valve 306, a first preheater 307, a first thermocouple 308 and a second pressure gauge 309 which are sequentially arranged on pipelines of the gas cylinder 301 and the first inlet 201 of the reaction kettle
The tracer solution injection system includes:
a tracer storage tank 310 connected with the second inlet 202 of the reaction kettle; and a second constant pressure and constant flow pump 311, a third cut-off valve 312, a second preheater 313, a second thermocouple 314 and a third pressure gauge 315 which are sequentially arranged on a pipeline connecting the tracer storage tank 310 and the second inlet 202 of the reaction kettle.
A third thermocouple 401, a fourth pressure gauge 402 and a fourth stop valve 403 are arranged in sequence along the pipeline from the outlet 203 of the reaction kettle to the fluid ion test analysis system 4.
The fluid ion test analysis system 4 is an inductively coupled plasma emission spectrometer.
The types of the first thermocouple 308, the second thermocouple 314 and the third thermocouple 401 are not limited to pt 100.
The method for simulating the water rock reaction by using the device comprises the following steps:
(1) debugging before experiment: connecting pipelines, opening a first stop valve 302, a second stop valve 306, a third stop valve 312, a fourth stop valve 403 and a fifth stop valve 404, introducing pure water into the whole reaction device, testing the sealing performance, opening the micro CT system 1 to scan the reaction kettle 2 made of polytetrafluoroethylene, checking images and eliminating artifacts; a test fluid ion test analysis system 4;
(2) reference data acquisition: firstly, scanning pure air in a reaction kettle 2 by using a micro CT scanning system 1, then scanning pure water in the reaction kettle 2, and then scanning a standard core sample to obtain data serving as CT reference data for determining porosity distribution; loading the dried carbonate rock core sample in the Sichuan basin region into a reaction kettle 2, and scanning by using a micro CT system 1 to obtain a pore structure in the core sample;
(3) and (3) starting a reaction: opening of CO2 First stop valve 302 of gas cylinder 301 for CO2Introducing the gas into a deionized water storage tank 304 until the gas is saturated to obtain CO with the volume concentration of 3 percent2A solution;
the pressure of the reaction device is adjusted to 10Mpa by the first constant-pressure constant-flow pump 304 and the second constant-pressure constant-flow pump 311; monitoring the pressure of the reaction device to reach the reaction set pressure of 10MPa through a first pressure gauge 303, a second pressure gauge 309, a third pressure gauge 315 and a fourth pressure gauge 402; adjusting an electric control temperature adjuster 205, heating the reaction kettle by 2-80 ℃ through a graphite electric heating ring sleeve 204, and monitoring the temperature of the reaction device to reach the reaction set temperature of 80 ℃ through a first thermocouple 308, a second thermocouple 314 and a third thermocouple 401;
after the temperature and the pressure are stable, the CO with the volume concentration of 3 percent is respectively pumped into the deionized water storage tank 304 by the first constant-pressure constant-flow pump 305 and the second constant-pressure constant-flow pump 311 at the speed of 1mL/min2The solution and NaI solution with the mass concentration of 10 percent and CO with the volume concentration of 3 percent in the NaI liquid storage tank 3102Preheating the solution and the NaI solution with the mass concentration of 10% by a first preheater 307 and a second preheater 313 on a pipeline respectively, pumping the solution into a reaction kettle 2, and starting reaction timing;
CT scans were performed at 1 minute intervals and were acquired by the micro CT system 1Zero moment start CO2CT data of distribution forms of the solution and the NaI solution in pores of the carbonate rock core sample; the fluid after reaction enters a fluid ion test analysis system 4, and Ca in the fluid at different moments is continuously monitored on line2+、Mg2+And Na+Ion concentration data of (a);
after the reaction lasts for 5 hours to the set time, the reaction is finished; the CT data and ion concentration data acquired during the entire reaction are processed 5 by a data acquisition and processing system.
(5) And (3) data post-processing: CO at different times based on acquisition2Obtaining the porosity distribution of the rock core sample to be tested by adopting a saturation difference method according to the CT data of the distribution form of the solution in the pores of the rock core sample to be tested; imaging a fluid advancing path, a diffusion distribution trend and saturation distribution based on the acquired CT data of the distribution form of NaI in the pores of the core sample to be tested at different moments; based on Ca in the obtained reacted fluid2+、Mg2+And Na+Obtaining the change trend of calcium carbonate ion product in the device, and calculating calcium carbonate-CO2Solution reaction rate and CO2Solution bulk diffusion coefficient, evaluation of CO2The relationship between the degree of fluid-carbonate interaction and the porosity distribution.
It should be noted that the above-mentioned embodiments are only for explaining the present invention, and do not constitute any limitation to the present invention. The present invention has been described with reference to exemplary embodiments, but the words which have been used herein are words of description and illustration, rather than words of limitation. The invention can be modified, as prescribed, within the scope of the claims and without departing from the scope and spirit of the invention. Although the invention has been described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein, but rather extends to all other methods and applications having the same functionality.
Claims (7)
1. An apparatus for simulating water rock reactions, comprising:
a micro CT scanning system;
a reaction kettle arranged in the micro CT scanning system;
a fluid injection system connected to the inlet of the reaction vessel;
a fluid ion test analysis system connected with the outlet of the reaction kettle; and
the data acquisition and processing system is used for acquiring data in the micro CT scanning system and the fluid ion test analysis system;
wherein the fluid injection system comprises CO connected to the first inlet of the reaction vessel2A solution injection system; and a tracer solution injection system connected with a second inlet of the reaction kettle, wherein the tracer is NaI;
and a third thermocouple, a fourth pressure gauge and a fourth stop valve are sequentially arranged on a pipeline from the outlet of the reaction kettle to the fluid ion testing and analyzing system.
2. The apparatus of claim 1, wherein the data acquisition and processing system is electrically connected to the micro CT scanning system and the fluid ion test analysis system, respectively.
3. The device as claimed in claim 1 or 2, wherein the reaction kettle is covered with an electric heating ring sleeve, and the electric heating ring sleeve is connected with the electric control temperature regulator through a lead.
4. The apparatus of claim 1, wherein the CO is present in a gas phase2The solution injection system includes: CO connected with the first inlet of the reaction kettle2A gas cylinder; and
in connection with the CO2The pipeline of the gas cylinder and the first inlet of the reaction kettle is sequentially provided with a first stop valve, a first pressure gauge, a deionized water liquid storage tank, a first constant-pressure constant-flow pump, a second stop valve, a first preheater, a first thermocouple and a second pressure gauge;
the tracer solution injection system includes:
a tracer liquid storage tank connected with a second inlet of the reaction kettle; and
and the tracer liquid storage tank, the second constant-pressure constant-flow pump, the third stop valve, the second preheater, the second thermocouple and the third pressure gauge are sequentially arranged on a pipeline connecting the tracer liquid storage tank and the second inlet of the reaction kettle.
5. The apparatus of claim 1 or 2, wherein the reaction vessel is a cylindrical hollow vessel; and/or the reaction kettle is made of one or more of polyether-ether-ketone, polytetrafluoroethylene and carbon fiber.
6. A method of simulating a water-rock reaction using the apparatus of any one of claims 1-5, comprising the steps of:
a, scanning pure air in a reaction kettle by using a micro CT scanning system, then scanning pure water in the reaction kettle, and then scanning a standard core sample to obtain CT reference data for determining porosity distribution;
b, loading the dried rock core sample to be tested into a reaction kettle, and scanning by using a micro CT system to obtain a pore structure in the rock core sample to be tested;
c, reacting CO at the temperature and pressure required by the reaction2Preheating the solution and the tracer solution, pumping the preheated solution and the tracer solution into a reaction kettle, and starting reaction timing;
CT scanning is carried out at fixed time intervals to obtain CO at different moments2CT data of distribution forms of the solution and the tracer solution in the pores of the core sample to be tested; the fluid after reaction enters a fluid ion test analysis system, and the fluid ion test analysis system is utilized to obtain ion concentration data in the fluid at different moments;
d, finishing the reaction after the reaction is carried out for a set time; CT data and ion concentration data acquired in the whole reaction process are processed by a data acquisition and processing system.
7. Method according to claim 6, wherein the CO is based on different instants of acquisition2CT data of solution distribution form in the pores of the rock core sample to be tested by adopting saturation differenceObtaining the porosity distribution of a rock core sample to be tested by a value method; imaging a fluid advancing path, a diffusion distribution trend and saturation distribution based on the acquired CT data of the distribution form of the tracer solution in the pores of the core sample to be tested at different moments; and obtaining the ion product variation trend in the device based on the obtained ion concentration data in the reacted fluid, calculating the reaction rate and the integral diffusion coefficient, and evaluating the relationship between the fluid rock interaction degree and the porosity distribution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710093415.1A CN108458957B (en) | 2017-02-21 | 2017-02-21 | Device and method for simulating water rock reaction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710093415.1A CN108458957B (en) | 2017-02-21 | 2017-02-21 | Device and method for simulating water rock reaction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108458957A CN108458957A (en) | 2018-08-28 |
| CN108458957B true CN108458957B (en) | 2022-06-17 |
Family
ID=63228811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710093415.1A Active CN108458957B (en) | 2017-02-21 | 2017-02-21 | Device and method for simulating water rock reaction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108458957B (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109239311B (en) * | 2018-10-23 | 2024-03-22 | 中国石油化工股份有限公司 | Method for testing filling degree of plugging agent |
| CN109115658B (en) * | 2018-11-02 | 2020-12-04 | 国家地质实验测试中心 | Rock diffusion coefficient measuring device and method |
| CN109632557B (en) * | 2019-01-22 | 2021-11-16 | 中国矿业大学 | Gas-liquid two-phase saturated coal rock sample experimental device and saturation testing method |
| CN111610306B (en) * | 2019-02-25 | 2022-06-21 | 中国石油化工股份有限公司 | Simulation experiment device for reforming effect of hydrocarbon-generating fluid on rock reservoir |
| CN111720115B (en) * | 2019-03-22 | 2023-11-14 | 中国石油化工股份有限公司 | Water-rock reaction device and method for simulating fracture-fluid system environment |
| CN110132797A (en) * | 2019-05-29 | 2019-08-16 | 西南石油大学 | It is a kind of for measuring the experimental provision and method of chemical agent diffusion coefficient in rock core |
| CN110596159A (en) * | 2019-09-19 | 2019-12-20 | 中国科学院广州地球化学研究所 | Rock on-line heating porosity test additional device |
| CN110879271B (en) * | 2019-12-13 | 2021-08-20 | 大连理工大学 | CO under simulated formation condition2Experimental device and method for water-rock reaction |
| CN113763796B (en) * | 2020-06-04 | 2023-10-13 | 中国石油化工股份有限公司 | Experimental device for simulating interaction between carbon dioxide saturated fluid and surrounding rock |
| CN112098155B (en) * | 2020-09-14 | 2021-10-26 | 中国石油大学(北京) | Oil reservoir oil-water-rock reaction experimental device and method and sampling position determination method |
| CN112964603B (en) * | 2021-03-02 | 2022-10-28 | 中国石油大学(华东) | Multi-rock-disk acid liquid radial flow real-time imaging simulation system for fracture-cave carving and working method thereof |
| CN113049763B (en) * | 2021-03-08 | 2022-02-11 | 西南石油大学 | Experimental testing device and testing method for salt precipitation concentration of high-temperature high-pressure real formation water |
| CN116256300B (en) * | 2023-05-08 | 2023-10-13 | 中国矿业大学(北京) | Device and method for evaluating damage of high-temperature and high-humidity gas to surrounding rock pore structure |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5297420A (en) * | 1993-05-19 | 1994-03-29 | Mobil Oil Corporation | Apparatus and method for measuring relative permeability and capillary pressure of porous rock |
| CN1469134A (en) * | 2003-06-17 | 2004-01-21 | 华东理工大学 | Microbe tracing method for oil deposit well |
| CN104777086A (en) * | 2015-04-10 | 2015-07-15 | 中国石油大学(华东) | Device and method for measuring three-phase permeability of supercritical CO2 emulsion by steady-state flow method |
| CN104914017A (en) * | 2015-04-27 | 2015-09-16 | 大连理工大学 | Device and method using CT (computed tomography) technology to detect CO2 dispersion in porous media |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10061061B2 (en) * | 2014-07-28 | 2018-08-28 | Schlumberger Technology Corporation | Well treatment with digital core analysis |
| CN104407118B (en) * | 2014-12-01 | 2016-08-24 | 中国石油天然气股份有限公司 | A kind of carbonate rock corrosion and the analysis method of corrosion effect |
| CN104880395A (en) * | 2015-05-13 | 2015-09-02 | 成都理工大学 | Rock-fluid reaction in situ observation device capable of controlling temperature and pressure |
| CN104897545A (en) * | 2015-06-09 | 2015-09-09 | 中国石油天然气股份有限公司 | Core pore structure change detection and analysis method |
-
2017
- 2017-02-21 CN CN201710093415.1A patent/CN108458957B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5297420A (en) * | 1993-05-19 | 1994-03-29 | Mobil Oil Corporation | Apparatus and method for measuring relative permeability and capillary pressure of porous rock |
| CN1469134A (en) * | 2003-06-17 | 2004-01-21 | 华东理工大学 | Microbe tracing method for oil deposit well |
| CN104777086A (en) * | 2015-04-10 | 2015-07-15 | 中国石油大学(华东) | Device and method for measuring three-phase permeability of supercritical CO2 emulsion by steady-state flow method |
| CN104914017A (en) * | 2015-04-27 | 2015-09-16 | 大连理工大学 | Device and method using CT (computed tomography) technology to detect CO2 dispersion in porous media |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108458957A (en) | 2018-08-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108458957B (en) | Device and method for simulating water rock reaction | |
| CN110879271B (en) | CO under simulated formation condition2Experimental device and method for water-rock reaction | |
| CN107807143B (en) | Low-field nuclear magnetic resonance multi-probe quantitative test system and method special for hydrate | |
| Pini et al. | Capillary pressure and heterogeneity for the CO2/water system in sandstone rocks at reservoir conditions | |
| CN108627533A (en) | Fluid employs the nuclear magnetic resonance experiment method and device of feature in a kind of measurement porous media | |
| CN102628354B (en) | Pore micron-sized oil water distribution recognition and quantification method | |
| CN106872497B (en) | The special hydrate resistivity test devices of CT and method | |
| CN103900755B (en) | A kind of application CT measures the apparatus and method of oil gas minimum miscibility pressure | |
| CN111337542B (en) | Method and device for monitoring osmotic absorption force in heavy metal polluted site by time domain reflection method | |
| CN112577979B (en) | Quantitative analysis device and method for rock internal fluid saturation spatial distribution | |
| CN106353357A (en) | Device and method for monitoring micro structure changes of sand soil medium under seepage effect | |
| CN116593673A (en) | Visual test system and method for simulating hot flue gas sealing and methane extraction | |
| US11519866B1 (en) | Multifunctional experimental system for in-situ simulation of gas hydrate | |
| Zhang et al. | A testing assembly for combination measurements on gas hydrate-bearing sediments using x-ray computed tomography and low-field nuclear magnetic resonance | |
| CN113218834A (en) | Experimental device and method for quantitatively describing seepage damage of dense gas fracturing fluid and reservoir | |
| Zhang et al. | Changes in reaction surface during the methane hydrate dissociation and its implications for hydrate production | |
| CN111595710A (en) | Water rock reaction simulation experiment method for carbonate rock corrosion under different temperature conditions | |
| Luo et al. | Study of diffusivity of hydrocarbon solvent in heavy-oil saturated sands using X-ray computer assisted tomography | |
| CN113763796B (en) | Experimental device for simulating interaction between carbon dioxide saturated fluid and surrounding rock | |
| CN112485282A (en) | Measuring system and method for soil-water characteristic curve of gas hydrate-containing sediment | |
| CN104914017B (en) | One kind utilizes CO in CT technology for detection porous medias2The method of disperse | |
| CN110261266A (en) | A kind of apparatus and method of comprehensive NMR and CT scan measurement oil gas minimum miscibility pressure | |
| CN206772864U (en) | The special hydrate resistivity test devices of CT | |
| CN112882107B (en) | EGS magnetic nanoparticle tracing technology and interpretation method | |
| Song et al. | CO 2 diffusion in n-hexadecane investigated using magnetic resonance imaging and pressure decay measurements |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |