CN110284880A - A kind of Carbonate acidizing earthworm hole dynamic expansion real-time monitoring device and its working method - Google Patents
A kind of Carbonate acidizing earthworm hole dynamic expansion real-time monitoring device and its working method Download PDFInfo
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- CN110284880A CN110284880A CN201910526917.8A CN201910526917A CN110284880A CN 110284880 A CN110284880 A CN 110284880A CN 201910526917 A CN201910526917 A CN 201910526917A CN 110284880 A CN110284880 A CN 110284880A
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- 241000361919 Metaphire sieboldi Species 0.000 title claims abstract description 34
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 title claims abstract description 22
- 238000012806 monitoring device Methods 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 title claims description 22
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- 238000012360 testing method Methods 0.000 claims abstract description 25
- 238000005481 NMR spectroscopy Methods 0.000 claims abstract description 24
- 238000006243 chemical reaction Methods 0.000 claims abstract description 22
- 238000012545 processing Methods 0.000 claims abstract description 19
- 238000011084 recovery Methods 0.000 claims abstract description 12
- 239000012530 fluid Substances 0.000 claims abstract description 10
- 238000004064 recycling Methods 0.000 claims abstract description 9
- 238000012544 monitoring process Methods 0.000 claims abstract description 8
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 7
- 238000006073 displacement reaction Methods 0.000 claims abstract description 6
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 239000007788 liquid Substances 0.000 claims description 19
- 238000002474 experimental method Methods 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 16
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims description 12
- 229910001424 calcium ion Inorganic materials 0.000 claims description 12
- 229910001425 magnesium ion Inorganic materials 0.000 claims description 12
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims description 11
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 claims description 11
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 9
- 150000002500 ions Chemical class 0.000 claims description 9
- 238000004088 simulation Methods 0.000 claims description 8
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- 238000002347 injection Methods 0.000 claims description 7
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- 230000008569 process Effects 0.000 claims description 6
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- 238000013178 mathematical model Methods 0.000 claims description 5
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- 238000001816 cooling Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 238000003786 synthesis reaction Methods 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 2
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- 239000000696 magnetic material Substances 0.000 claims description 2
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- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 230000011218 segmentation Effects 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
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- 241000208340 Araliaceae Species 0.000 description 1
- 229910021532 Calcite Inorganic materials 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
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- 239000011575 calcium Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- HHSPVTKDOHQBKF-UHFFFAOYSA-J calcium;magnesium;dicarbonate Chemical compound [Mg+2].[Ca+2].[O-]C([O-])=O.[O-]C([O-])=O HHSPVTKDOHQBKF-UHFFFAOYSA-J 0.000 description 1
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- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
Abstract
A kind of Carbonate acidizing earthworm hole dynamic expansion real-time monitoring device, including the acquisition of acid solution injected system, acid-rock reaction system, nuclear magnetic resonance test macro, acid solution recovery and processing system, data and Experimental Control System.Acid-rock reaction system is used for simulated formation temperature, pressure；Nuclear magnetic resonance test macro is imaged for rock core hole；Acid solution recovery and processing system is for recycling acid solution, processing exhaust gas.Carbonate acidizing earthworm hole dynamic expansion real-time monitoring is carried out using the device, quiescent imaging precision reaches 0.1~100 μm, dynamic imaging time most short 13s, the requirement that earthworm hole fast imaging when hole is accurately described and is acidified before being acidified can be met simultaneously solves the problems, such as that reacting fluid displacement test hole changes rapid, difficult in imaging.
Description
Technical field
The present invention relates to a kind of Carbonate acidizing earthworm hole dynamic expansion real-time monitoring device and its working methods, belong to oil
The technical field of gas reservoir well stimulation.
Background technique
Carbonate Reservoir petroleum resources are abundant, and reserves account for about the half of global total amount.To improve near wellbore stratum
Permeability, Oil Field often carries out acidification.In order to determine optimal acidizing parameters, it usually needs carry out in the lab
Simulated experiment.Acidification simulation mainly includes numerical simulation and two kinds of physical analogy.Numerical simulation is by electronic computer, with number
The mode that value calculates simulates Carbonate acidizing process, has the advantages that visual in image, repeatable strong.Since numerical simulation exists
A degree of simplification is carried out to acidification mechanism when founding mathematical models, analog result and actual capabilities can have larger difference
It is different.Physical analogy is that acid solution is injected rock core under certain condition, studies the corrosion situation of rock core, can more accurately reflect acid
Change process.But the physical analogy disadvantage that there is also experiment conditions to limit to, process is not visible.
Respectively there are advantage and disadvantage in view of above two analogy method, the highest method of degree of recognition is to combine both at present,
I.e. numerical simulation is mutually authenticated with physical analogy, completes optimization design jointly.Since reservoir heterogeneity is strong, and acid and carbonate
Acutely, often there is acidizing wormhole in rock reaction during Carbonate acidizing.As the most significant feature of Carbonate acidizing, earthworm
Hole track directly determines formation acidizing effect, can be used as the standard that two kinds of analogy methods are mutually authenticated.Since earthworm hole is inclined to
In in rock core growth inside, track is not visible, and the acidification experiment of carbonate rock rock core generally requires the branch of blowhole imaging technique
It holds.
Compared with computed tomography (CT), Magnetic resonance imaging (MRI) data processing is simple, harmless, is
Current most widely used blowhole monitoring technology.However most of Magnetic resonance imaging times are longer, it usually needs 0.5-
2h, and can only be under conditions of saturated water or other non-reacting fluid, static state obtains hole information.Even if there is part nuclear-magnetism total
Vibration imaging is used for reacting fluid displacement test, is also only simply compared, can not be dynamically supervised before and after experiment during the experiment
Survey blowhole variation.The acidification experiment of carbonate rock rock core generally only lasts for 3~15min, and rapidly, this will for blowhole variation
Seeking Magnetic resonance imaging not only has preferable precision, also to there is very short imaging time, can change to blowhole and carry out in fact
When monitor.
CN108226192A discloses a kind of acid-etched fracture morphological feature acquisition methods.By to the test to acidification front and back
Rock core carries out non-destructive testing radiography, obtains the fracture pattern feature image of testing rock core acidification front and back, passes through comparison
Feature image obtains the acid-etched fracture morphological feature of different acid solution types and lower formation different in flow rate, but exists and can not dynamically move
State monitors acidization.
CN104314547A discloses a kind of fractured horizontal well acidification partitive optimization method and system, including dummy level well
Segmentation matrix acidifying process, prediction form horizontal well in segments matrix acidifying production capacity, predicted segmentation acid fracturing horizontal productivity, to level
Well subsection acidizing acid fracturing optimizes, realizes the digitlization of well logging picture, integrative levels well segmentation matrix acidifying and two class of acid fracturing
The Optimizing Flow of technique.
Summary of the invention
In view of the shortcomings of the prior art, the present invention proposes a kind of Environmental Safety, time-consuming few earthworm hole dynamic expansion real-time monitoring
Device and working method, to realize the target of carbonate rock rock core acidization real-time monitoring.
A kind of Carbonate acidizing earthworm hole dynamic expansion real-time monitoring device, including acid solution injected system, acid-rock reaction system
System, the acquisition of nuclear magnetic resonance test macro, acid solution recovery and processing system, data and Experimental Control System.
The acid solution injected system is used to provide power for acid solution flowing and adjusts injection rate；The acid-rock reaction system
For providing certain temperature and confining pressure (rock core wall pressure) for acid-rock reaction；The nuclear magnetic resonance test macro is for acquiring core
Magnetic resonance signal, by fluid distrbution real time imagery in rock core；The acid solution recovery and processing system is for recycling acid solution, handling and give up
Gas；The data acquisition and Experimental Control System acquire pressure, flow, temperature and the key of acid solution for experiment parameter to be arranged
The concentration of ion changes, and controls experiment process.
Preferably, the acid solution injected system includes constant pressure constant speed constant-flux pump, intermediate receptacle, vacuum pump, conical flask.It is described
Vacuum pump is used for intermediate receptacle pressure release.
Preferably, the acid-rock reaction system includes core holding unit, ring pressure tracking pump, heating device, circulating pump.It is described
Core holding unit is used to provide confining pressure for rock core, and the shell and plug of the core holding unit are non-magnetic material, and shell is intracorporal
Rubber sleeve is not hydrogenous material, fills fluorocarbon oil in the cavity in rubber sleeve；The ring pressure tracking pump to rock core for clamping
Device pumps fluorocarbon oil, keeps constant the difference of confining pressure and displacement pressure；The heating device is for heating fluorocarbon oil；The circulating pump is used
In circulation fluorocarbon oil, confining pressure is reduced.
Preferably, the nuclear magnetic resonance test macro includes magnet unit, radio frequency unit, spectrometer units, power supply unit, spy
Head, software.The magnet unit makes atomic nucleus that energy level splitting, the magnet list that the present invention uses occur for providing uniform magnetic field
First field strength is 0.5-1T, more preferably 0.82T, and relative to other low-field nuclear magnetic resonances (field strength 0.3T), accuracy of identification is high, is imaged
Time is short；The radio frequency unit is for providing RF excited；The spectrometer units play digital received, digital-to-analogue conversion, pulse sequence
The key effects such as column-generation, timing control, frequency synthesis；Said supply unit is used to provide heating for nuclear magnetic resonance test macro
With power supply；The probe is for motivating and receiving fluid signal；The software exports image for handling data.
Preferably, the acid solution recovery and processing system include condenser, back-pressure valve, buffer unit, backpressure pump, cold rinse bank,
Water supply pump, gas-liquid separator, exhaust processor, acid solution recycling can.The condenser is for cooling down hot mixture；The back pressure
Valve, backpressure pump are for stablizing rock core outlet pressure；The water supply pump is used to pump cold water to condenser；The cold rinse bank is for storing up
Deposit cooling water；The buffer unit is for reducing the Fluid pressure flowed out from acid-rock reaction system；The gas-liquid separator
Gas-liquid is separated using gravitational settling mode；Aqueous slkali is filled in the exhaust processor, the CO generated for handling reaction2, wave
The HCl gas of hair.
The preferred data acquisition and Experimental Control System include flow, pressure, temperature, hydrogen ion, calcium ion and magnesium
Ion transducer, experiment control and data processing software.The hydrogen ion, calcium ion and magnesium ion sensor are respectively adopted to hydrogen
The electrode of ion, calcium ion and magnesium ion sensitivity.
The acid solution injected system, acid-rock reaction system, acid solution recovery and processing system are successively connected to pipeline, are directly contacted
The intermediate receptacle of acid solution, core holding unit, condenser, back-pressure valve, gas-liquid separator, exhaust processor, pipeline, valve, sensing
The inner wall and key position of device are manufactured using acid resisting alloy.
The method of use device progress Carbonate acidizing earthworm hole dynamic expansion real-time monitoring, comprising the following steps:
(1) after standard carbonate rock rock core being saturated with water processing, it is packed into core holding unit, distilled water and hydrochloric acid are distinguished
Pour into intermediate receptacle, connecting pipeline；
(2) parameters such as flow, temperature, confining pressure, back pressure are set, heating device and the preheating of nuclear magnetic resonance test macro are opened；
(3) apply confining pressure and back pressure to core holding unit, distilled water low speed is injected into rock core, test system using nuclear magnetic resonance
System carries out prescan to rock core, to reduce signal-to-noise ratio, improve accuracy of identification, when radio-frequency pulse, gradient fields, signal acquisition is arranged
It carves, obtains rock core distribution of pores of the size in 0.1~100 μ m；
(4) acid solution is injected into rock core, monitoring size changes in 10 μm or more of rock core hole, and rock core both ends pressure difference, which is down to, to be set
After definite value, constant-flux pump and ring pressure tracking pump are closed；
(5) data processing software is utilized, flow, pressure and each ion concentration is drawn and changes over time curve, in conjunction with rock core
Distribution of pores picture analyzing acidization, and compared with numerical simulation result, improve mathematical model.
(6) water drive rock core, cleaning pipeline, until liquid color is discharged close to transparent, opening circulating pump reduction confining pressure, taking-up
Rock core.
Beneficial effects of the present invention:
(1) magnetic resonance imaging device and rock core displacement equipment are combined by the present invention, using flow, pressure, temperature and from
Sub- sensor can completely monitor and record rock core acidization under formation condition, provide crucial letter to improve acidification mathematical model
Breath.
(2) a variety of nuclear magnetic resonance ginsengs are arranged according to blowhole feature in the present invention magnet unit strong using high field
Number, 0.1~100 μm of quiescent imaging precision, dynamic imaging time most short 13s, can meet simultaneously acidification before hole accurately describe with
The requirement of earthworm hole fast imaging when acidification solves the problems, such as that reacting fluid displacement test hole changes rapid, difficult in imaging.
(3) the acid solution recovery and processing system that the present invention uses can effectively reduce pollution of the acidification experiment to environment, improve acid
Liquid utilization rate.
Detailed description of the invention
Fig. 1 is the earthworm hole dynamic expansion real-time monitoring device structural block diagram that embodiment 1 provides；
Fig. 2 is the nuclear magnetic resonance test result that embodiment 1 provides, and wherein Fig. 2 a acquires the moment for 1min, when Fig. 2 b is acquired
Carving is 2min, and Fig. 2 c acquires the moment as 4min, and Fig. 2 d acquisition moment is 7min；
Fig. 3 is earthworm hole length-time graph that embodiment 1 provides；
Fig. 4 is injection pressure-time graph that embodiment 1 provides；
Fig. 5 is ion concentration-time graph that embodiment 1 provides；
The appended drawing reference of each component described in Fig. 1-5 is as follows: 1, constant pressure constant speed constant-flux pump, 2, valve, 3, intermediate receptacle, 4,
Flow sensor, 5, pressure sensor, 6, temperature sensor, 7, nuclear magnetic resonance test macro, 8, rock core, 9, core holding unit,
10, ring pressure tracking pump, 11, heating device, 12, circulating pump, 13, condenser, 14, sensors for hydrogen ion, 15, calcium ion sensing
Device, 16, magnesium ion sensor, 17, back-pressure valve, 18, buffer unit, 19, backpressure pump, 20, cold rinse bank, 21, water supply pump, 22, gas
Liquid/gas separator, 23, exhaust processor, 24, acid solution recycling can, 25, vacuum pump, 26, conical flask.
Specific embodiment
The invention will be further described and limits with embodiment with reference to the accompanying drawings of the specification.
Embodiment 1
A kind of Carbonate acidizing earthworm hole dynamic expansion real-time monitoring device, as shown in Figure 1, include acid solution injected system,
Acid-rock reaction system, nuclear magnetic resonance test macro, acid solution recovery and processing system, data acquisition and Experimental Control System.
The acid solution injected system includes constant pressure constant speed constant-flux pump 1, intermediate receptacle 3, vacuum pump 25, conical flask 26.It is described
Advection 0.01~25mL/min of pumpage, maximum pump pressure 40MPa；The intermediate receptacle capacity 1L, pressure-resistant 50MPa；The vacuum
Pump maximum pump pressure 0.1MPa.
The acid-rock reaction system includes core holding unit 9, ring pressure tracking pump 10, heating device 11, circulating pump 12.It is described
Core holding unit includes shell (material is non-magnetic steel), left and right plug (material is Hastelloy), rubber sleeve and sealing dress
It sets (material is perfluoroelastomer, corrosion-resistant, 200 DEG C of heatproof), whole pressure resistance 50MPa can accommodate 3~20cm of rock core length；It is described
Fluorocarbon oil is filled in heating device, heating method is electric heating, and 150 DEG C of maximum temperature, fluorocarbon oil flows into core holding unit shell through pipeline
Cavity between body and rubber sleeve provides temperature and confining pressure for rock core；The ring pressure tracking pump maximum pump pressure 50MPa, precision
0.1MPa；The circulating pump maximum pump pressure 5MPa.
The nuclear magnetic resonance test macro, including it is magnet unit, radio frequency unit, spectrometer units, power supply unit, probe, soft
Part.The magnet unit includes rare-earth permanent magnet, shim coil, magnet case, 0.82 ± 0.05T of field strength, and the magnet uniformity≤
50ppm；The radio frequency unit includes radio-frequency power amplifier, preamplifier, radio frequency unit cabinet, and peak value output is not less than
200W, it is desirable that power stability；The spectrometer units industrial control computer, clock controller (CLK), pulse-series generator
(PSG), direct digital synthesis technique source (DDS), digital analog converter (DAC), analog-digital converter (ADC)；Said supply unit temperature
Spend controller, heating system, power supply system；The probe includes 60mm probe, 25mm probe；The software includes that imaging is soft
Part, filtered Software, three-dimensionalreconstruction software.
The acid solution recovery and processing system includes condenser 13, back-pressure valve 17, buffer unit 18, backpressure pump 19, cold rinse bank
20, water supply pump 21, gas-liquid separator 22, exhaust processor 23, acid solution recycling can 24.The condenser is for cooling down high temperature mixing
Object, lower end are cold water inlet, and upper end is liquid outlet；The backpressure pump maximum pump pressure 5MPa, precision 0.01MPa；The cold water
Pump maximum pump pressure 5MPa；The gas-liquid separator separates gas-liquid using gravitational settling mode, and gas is flowed out by upper outlet, liquid by
Lower outlet outflow；The NaOH solution that filling quality concentration is 10% in the exhaust processor, for handling CO2And HCl.
The experiment control and data collection system include flow sensor 4, pressure sensor 5, temperature sensor 6, hydrogen
Ion transducer 14, conductor Calcium ion sensor 15, magnesium ion sensor 16, experimental control Software, data processing software.The flow
Sensor is differential pressure flowmeter, range 30mL/min, precision 0.1mL/min；The pressure sensor 5-1 range 50MPa, essence
Spend 0.2MPa；The pressure sensor 5-2 range 5MPa, precision 0.01MPa；200 DEG C of the temperature sensor range, precision 1
℃；The hydrogen ion, calcium ion and magnesium ion sensor are respectively adopted to hydrogen ion, calcium ion and the sensitive electrode of magnesium ion,
Response time is short, and the concentration variation of three kinds of ions can be monitored in real time；The experimental control Software, data processing software are in Win7
It runs under environment above, is programmed using VB.
The pipeline material is Hastelloy, internal diameter 2mm, outer diameter 5mm.
The working method of Carbonate acidizing earthworm hole dynamic expansion real-time monitoring device, specific steps include:
(1) Preparatory work of experiment: carbonate rock is processed into the rock core 8 of diameter 2.5cm, long 6cm, rock core folder is packed into after saturated water
Holder 9 adjusts plug length, is in rock core among core holding unit, by the hydrochloric acid of 500mL distilled water and mass concentration 15%
Intermediate receptacle 3-1 and 3-2 are poured into respectively, connect all pipelines；
(2) equipment preheats: closing valve 2-2,2-4,2-5,2-7,2-8, opens valve 2-1,2-3,2-6,2-9, opens experiment
Software is controlled, the parameters such as setting flow, temperature, confining pressure, back pressure, open heating device 11 and nuclear magnetic resonance test macro 7 carries out
Equipment preheating；
(3) prescan: ring pressure tracking pump 10 and backpressure pump 19 are opened, applies confining pressure and back pressure to core holding unit, opens
Distilled water is injected rock core with 1mL/min, to reduce signal-to-noise ratio, raising accuracy of identification as target, RF pulse-to-pulse is arranged by constant-flux pump 1
The parameters such as punching, gradient fields, signal acquisition moment obtain rock core distribution of pores (hole point of the size in 0.1~100 μ m
Primary condition of the cloth as rock core hole, logarithm analog result influence very big)；
(4) acidification experiment: closing constant-flux pump, valve 2-1,2-3, and to shorten imaging time as target, it is total to reset nuclear-magnetism
Vibration parameter, opens valve 2-2,2-4, constant-flux pump, and acid solution is injected rock core, monitoring rock core hole variation, rock with the speed of 3mL/min
Heart both ends pressure difference closes constant-flux pump and ring pressure tracking pump after being down to setting value；
(5) data are analyzed: data processing software is opened, flow, pressure and each ion concentration is drawn and changes over time curve,
It in conjunction with rock core distribution of pores picture analyzing acidization, and is compared with numerical simulation result, improves mathematical model.
(6) pipeline flush: closing valve 2-2,2-4,2-6,2-9, opens valve 2-1,2-3,2-7,2-8, constant-flux pump, distilled water
Pipeline is cleaned, until liquid color is discharged close to transparent, opening circulating pump reduction confining pressure, removal of core.
The rock core hole and acid solution key parameter obtained using the monitoring device.
Fig. 2 is nuclear magnetic resonance test result of the rock core in different moments, and white area NMR signal is stronger in figure, generation
Table earthworm hole and big pore matrix, black region signal is weaker, represents small pore matrix.Fig. 3~5 are earthworm hole length (earthworm hole tip respectively
To the distance at core entry end), the curve that changes over time of each ion concentration in injection pressure and residual acid.
Fig. 2 and Fig. 3 clearly shows that rock core acidization: 0~1min, acid solution are mainly used for corrosion core entry end；1
~2min, arrival end gradually develop short earthworm hole, and the earthworm hole speed of growth is accelerated；2~4min, a plurality of earthworm hole syntrophism, due to
Earthworm hole Competition, each earthworm hole length difference increase；4~7min, most of acid solution flow into longest earthworm hole, remaining earthworm hole is almost
It stops growing, and since acid solution linear loss increases, the earthworm hole speed of growth gradually slows down.
The reason of injection pressure that Fig. 4 shows fluctuates decline in 1~7min, pressure oscillation is that the gas that reaction generates exists
Continuous expansion/compression in blowhole.While we also noted that, between injection pressure slope of a curve and the earthworm hole speed of growth
It can be judged in rock core according to injection pressure curve without Magnetic resonance imaging in the presence of negatively correlated relationship
The growing state in earthworm hole.
Fig. 5 shows that before earthworm hole penetrates rock core, calcium ion and magnesium ion concentration sharply increase, and hydrogen ion mass transfer velocity
Calcium and magnesium ion obviously is lagged behind, it is suitable with the earthworm hole speed of growth.This illustrates rock core mainly by calcite (CaCO3) and dolomite
(CaMg(CO3)2) constitute；Hydrogen ion exists only in earthworm bore region, and acid liquid loss phenomenon is not present in matrix.
Claims (8)
1. a kind of Carbonate acidizing earthworm hole dynamic expansion real-time monitoring device, including acid solution injected system, acid-rock reaction system,
Nuclear magnetic resonance test macro, acid solution recovery and processing system, data acquisition and Experimental Control System；
The acid solution injected system is used to provide power for acid solution flowing and adjusts injection rate；The acid-rock reaction system is used for
Certain temperature and confining pressure are provided for acid-rock reaction；The nuclear magnetic resonance test macro is for acquiring NMR signal, by rock core
Interior fluid distrbution real time imagery；The acid solution recovery and processing system is for recycling acid solution, processing exhaust gas；The data acquisition and reality
Control system is tested for experiment parameter to be arranged, acquires the concentration variation of the pressure of acid solution, flow, temperature and crucial ion, control
Experiment process.
2. device as described in claim 1, it is characterised in that the acid solution injected system includes constant pressure constant speed constant-flux pump, centre
Container, vacuum pump, conical flask；The vacuum pump is used for intermediate receptacle pressure release.
3. device as described in claim 1, it is characterised in that the acid-rock reaction system includes core holding unit, ring pressure tracking
Pump, heating device, circulating pump；The core holding unit is used to provide confining pressure for rock core, the shell of the core holding unit and blocks up
Head is non-magnetic material, and the intracorporal rubber sleeve of shell is not hydrogenous material, fills fluorocarbon oil in the cavity in rubber sleeve；The ring
Pressure tracking pump keeps constant the difference of confining pressure and displacement pressure for pumping fluorocarbon oil to core holding unit；The heating device is used
In heating fluorocarbon oil；The circulating pump reduces confining pressure for recycling fluorocarbon oil.
4. device as described in claim 1, it is characterised in that the nuclear magnetic resonance test macro includes magnet unit, radio frequency list
Member, spectrometer units, power supply unit, probe, software；The magnet unit makes atomic nucleus that energy level occur for providing uniform magnetic field
Division, the magnet unit field strength are 0.5-1T, more preferably 0.82T；The radio frequency unit is for providing RF excited；It is described
Spectrometer units play the role of digital received, digital-to-analogue conversion, pulse train generation, timing control, frequency synthesis；The power supply is single
Member is for providing heating and power supply for nuclear magnetic resonance test macro；The probe is for motivating and receiving fluid signal；Institute
Software is stated for handling data, exports image.
5. device as described in claim 1, it is characterised in that the acid solution recovery and processing system include condenser, back-pressure valve,
Buffer unit, backpressure pump, cold rinse bank, water supply pump, gas-liquid separator, exhaust processor, acid solution recycling can；The condenser is used for
Cooling hot mixture；The back-pressure valve, backpressure pump are for stablizing rock core outlet pressure；The water supply pump is used to pump to condenser
Send cold water；The cold rinse bank is for storing cooling water；The buffer unit is for reducing flowing out from acid-rock reaction system
Fluid pressure；The gas-liquid separator separates gas-liquid using gravitational settling mode；Aqueous slkali is filled in the exhaust processor, is used
In the CO that processing reaction generates2, volatilization HCl gas.
6. device as described in claim 1, it is characterised in that the data acquisition and Experimental Control System include flow, press
Power, temperature, hydrogen ion, calcium ion and magnesium ion sensor, experiment control and data processing software；The hydrogen ion, calcium ion
It is respectively adopted with magnesium ion sensor to hydrogen ion, calcium ion and the sensitive electrode of magnesium ion.
7. device as described in claim 1, it is characterised in that the acid solution injected system, acid-rock reaction system, acid solution recycling
Processing system is successively connected to pipeline, directly intermediate receptacle, core holding unit, condenser, the back-pressure valve, gas-liquid point of contact acid solution
Inner wall from device, exhaust processor, pipeline, valve, sensor is manufactured using acid resisting alloy.
8. a kind of carry out Carbonate acidizing earthworm hole dynamic expansion real-time monitoring using such as any one of claim 1-7 described device
Method, comprising the following steps:
(1) after standard carbonate rock rock core being saturated with water processing, it is packed into core holding unit, distilled water and hydrochloric acid are poured into respectively
Intermediate receptacle, connecting pipeline；
(2) parameters such as flow, temperature, confining pressure, back pressure are set, heating device and the preheating of nuclear magnetic resonance test macro are opened；
(3) apply confining pressure and back pressure to core holding unit, distilled water low speed is injected into rock core, utilizes nuclear magnetic resonance test macro pair
Rock core carries out prescan, to reduce signal-to-noise ratio, improve accuracy of identification, radio-frequency pulse, gradient fields, signal acquisition moment is arranged, obtains
Take rock core distribution of pores of the size in 0.1~100 μ m；
(4) acid solution is injected into rock core, monitoring size changes in 10 μm or more of rock core hole, and rock core both ends pressure difference is down to setting value
Afterwards, constant-flux pump and ring pressure tracking pump are closed；
(5) data processing software is utilized, flow, pressure and each ion concentration is drawn and changes over time curve, in conjunction with rock core hole
It is distributed picture analyzing acidization, and is compared with numerical simulation result, mathematical model is improved.
(6) water drive rock core, cleaning pipeline, until liquid color is discharged close to transparent, opening circulating pump reduction confining pressure, taking-up rock
The heart.
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| CN201910526917.8A CN110284880A (en) | 2019-06-18 | 2019-06-18 | A kind of Carbonate acidizing earthworm hole dynamic expansion real-time monitoring device and its working method |
| PCT/CN2019/092518 WO2020252801A1 (en) | 2019-06-18 | 2019-06-24 | Device for real-time monitoring of dynamic propagation of wormholes during carbonate rock acidification, and operation method therefor |
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