CN106988711B - A method for improving oil displacement effect of strong vertical heterogeneity reservoir - Google Patents
A method for improving oil displacement effect of strong vertical heterogeneity reservoir Download PDFInfo
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Abstract
The invention discloses a kind of methods for improving strong vertical heterogeneity oil reservoir oil displacement effect, comprising: chooses different permeability ratio height respectively and seeps rock core；Preparation experiment simulated formation water；Preparation experiment simulation oil；Rock core is saturated Mn2+Simulated formation water, gaging hole porosity calculate pore volume；High low permeability cores are in parallel, simulation oil displacement rock core is tested, nuclear magnetic resonance T is surveyed2Spectrum；Successively use simulated formation water, CO2Gas injects surfactant and uses CO again2Gas, injection CO2Gas is followed by with certain speed injection simulated formation water, injection CO2Gas followed by injects foam solution, surveys nuclear magnetic resonance T2Spectrum calculates oil displacement efficiency；Oil displacement efficiency under different displacement modes is added, obtains the total oil displacement efficiency of hypertonic rock core, low permeability cores.This method can block the macropore of high permeability reservoir, reduce the oil water interfacial tension of LOW PERMEABILITY RESERVOIR, improve the oil displacement efficiency of LOW PERMEABILITY RESERVOIR, and then effectively improve the whole oil displacement efficiency of strong vertical heterogeneity oil reservoir.
Description
Technical field
The present invention relates to oil and gas development experimental technique fields, in particular to a kind of to improve strong vertical heterogeneity oil reservoir oil displacement
The method of effect.
Background technique
Strong vertical heterogeneity oil reservoir, which refers to, exists simultaneously hypertonic, LOW PERMEABILITY RESERVOIR on longitudinal direction, the permeability between them is poor
It is different big, a large amount of remaining oil preservation is had for such oil reservoir, after water drive in the small duct of LOW PERMEABILITY RESERVOIR, how to be passed through
Displacement mode combination and injection rate optimization carry out the oil displacement efficiency of LOW PERMEABILITY RESERVOIR after improving ecology, and then the entirety for improving oil reservoir is opened
Effect is sent out, there is important guiding value for strong vertical heterogeneity oil reservoir Efficient Development.In existing research, patent
CN201410174888.0 proposes a kind of method that core flooding test effect is seeped in raising；Patent CN201610473656.4 is proposed
A kind of device and method of analog different angle oil reservoir oil displacement efficiency；Patent CN200910014855.9 proposes one kind
Improve the online depth profile control method of oil displacement effect of polymer of offshore production well；Patent CN201510275580.X proposes a kind of drive
Oily effect detection method and device；Patent CN201520795934.9 proposes a kind of for simulating fault block oil reservoir oil displacement efficiency
Plane visualization experimental provision；Patent CN201410319256.9 proposes a kind of each layer position of determining heterogeneous reservoir and position is driven
The method of oily efficiency and sweep efficiency；Patent CN201010102946.0 proposes a kind of longitudinal direction and plane heterogeneous plate models
Oil-water displacement efficiency experimental method；Patent CN201610096041.4 proposes a kind of waterflooding reservoir oil-reservoir water oil displacement efficiency
Sentence knowledge method；Patent CN201510431175.2 proposes dual media reservoir gas injection and improves matrix, microcrack oil displacement efficiency
Recovery method；Patent CN201010610695.7 proposes non-homogeneous model oil-water displacement efficiency evaluation system in layer.2009
The phase of volume 16 the 5th, oil-gas geology and recovery ratio, Liang Yuwen et al. is in " strong heterogeneous reservoir air foam transfer drive pilot test-
By Hu shape collection oil field recklessly for 12 fault blocks " in a text using Hu shape integrate oil field recklessly the strong heterogeneous reservoir of 12 fault blocks as research object,
Air foam is had rated for blocking dominant flowing path, renwing stratum energy, reducing moisture content and improving the effect of recovery ratio.
In existing research, patent CN201410174888.0 passes through a variety of displacement sides primarily directed to single middle infiltration rock core
Formula improves oil displacement efficiency, inadaptable for strong vertical heterogeneity, multiple rock cores, multiple oil reservoirs simultaneous conditions.And
The raising oil displacement efficiency method, apparatus or a kind of detection that other patents are mainly proposed for different objects from different perspectives
Device and evaluation system.And Liang Yuwen et al. is " strong heterogeneous reservoir air foam transfer drive pilot test-is with Hu shape oil-collecting
Field is recklessly for 12 fault blocks " the air foam displacement mode mentioned in a text is different from the mode of action of the present invention, the mechanism of action, changing
There is also differents in terms of kind oil displacement efficiency.As it can be seen that being directed to strong vertical heterogeneity oil reservoir at present, pass through a variety of displacement modes
The method for improving whole oil displacement efficiency has not been reported.
Summary of the invention
To solve drawbacks described above existing in the prior art, it is strong longitudinal non-equal that the purpose of the present invention is to provide a kind of raisings
The method of matter oil reservoir oil displacement effect, this method can either be blocked the macropore of high permeability reservoir, can also be reduced low by experiment
The oil water interfacial tension of permeability hiding, increases the fluid ability of small duct Crude Oil, additionally it is possible to increase displacing medium in low-permeability oil
Sphere of action in hiding, improves the oil displacement efficiency of LOW PERMEABILITY RESERVOIR, and then effectively improves the whole of strong vertical heterogeneity oil reservoir and drive
Oily effect.
The present invention is realized by following technical proposals.
A method of strong vertical heterogeneity oil reservoir oil displacement effect is improved, is included the following steps:
Step 1: choosing hypertonic rock core and each 1 piece of low permeability cores, the permeability ratio of hypertonic rock core and low permeability cores respectively
Greater than 10；
Step 2: preparing Mn2+Experiment simulated formation water, reaches formation water salinity；
Step 3: reaching crude oil viscosity according to kerosene and in-place oil preparation experiment simulation oil；
Step 4: rock core is placed in high pressure saturation device, it is made to be saturated Mn2+Simulated formation water, gaging hole porosity calculate hole
Gap volume；
Step 5: hypertonic rock core and low permeability cores are in parallel, under the conditions of identical simulated formation temperature and pressure, with matching
The experiment simulation oil displacement rock core set establishes initial oil saturation more than two pieces of rock core difference displacements to 3 times of pore volumes
Degree surveys nuclear magnetic resonance T2Spectrum；
Step 6: using Mn2+Simulated formation water simultaneously two blocks of rock cores of displacement only can be discharged to outlet port of rock core holder
Until oil, nuclear magnetic resonance T is surveyed2Spectrum calculates oil displacement efficiency；
Step 7: utilizing CO2Two blocks of rock cores of displacement survey core until outlet port of rock core holder is not fuel-displaced to gas simultaneously
Magnetic resonance T2Spectrum calculates oil displacement efficiency；
Step 8: injecting surfactant solution to flow in low permeability core, nuclear magnetic resonance T is surveyed2Spectrum calculates oil displacement efficiency；
Step 9: recycling CO2Gas simultaneously survey until outlet port of rock core holder is not fuel-displaced by two blocks of rock cores of displacement
Nuclear magnetic resonance T2Spectrum calculates oil displacement efficiency；
Step 10: injecting CO with certain speed2Gas certain volume followed by injects simulated formation with certain speed
Water certain volume circuits sequentially 10 rounds of injection, while two blocks of rock cores of displacement are until outlet port of rock core holder is fuel-displaced,
Survey nuclear magnetic resonance T2Spectrum calculates oil displacement efficiency；
Step 11: injecting CO with certain speed2Gas certain volume is followed by certain with certain speed injection foam solution
Volume circuits sequentially 12 rounds of injection, surveys nuclear magnetic resonance T2Spectrum calculates oil displacement efficiency；
Step 12: the oil displacement efficiency under different displacement modes is added, the total displacement of reservoir oil effect of hypertonic rock core, low permeability cores is obtained
Rate.
Further, the Mn2+Simulated formation aqueous solution is the salt containing manganese ion that concentration is 14000-16000mg/L,
For MnCl2。
Further, the formation water salinity for reaching formation water salinity oil reservoir where coring, it is described to reach
Crude oil viscosity is the stratigraphic oil fields viscosity of crude of oil reservoir where coring.
Further, described that rock core is placed in high pressure saturation device, pressure 8-12MPa, the time is 10-15 hours, is made
Its saturation simulation water flooding.
Further, it in the step 4, calculates pore volume and is realized by following formula:
V=π × r2×L×Φ
In formula: V is rock pore volume, cm；R is core diameter, cm；L is rock core length, cm；Φ is rock core hole
Degree, %.
Further, in the step 8, surfactant is that 0.3-0.7% is formulated GMQ-5 by mass percentage, injects table
Agent living is 0.2-0.5PV.
Further, in the step 6~step 11, with 0.1ml/min speed displacement rock core；CO is injected in step 102
The total 0.05PV of gas followed by injects the total 0.05PV of simulated formation water with certain speed；CO is injected in step 112Gas is total
0.05PV followed by injects the total 0.05PV of foam solution with certain speed.
Further, in the step 11, foam solution is that 0.3-0.7% is prepared ZYH-0860 foaming agent by mass percentage
It forms.
Further, the calculating oil displacement efficiency is realized by following formula:
In formula: R is oil displacement efficiency, %；SiFor the nuclear magnetic resonance T under a certain displacement mode2The area that spectrum is surrounded with X-axis；
SoNuclear magnetic resonance T when for rock core saturated oils2The area that spectrum is surrounded with X-axis.
Further, the calculating displacement of reservoir oil gross efficiency is realized by following formula:
RAlways=R1+R2+R3+R4+R5+R6
In formula: R1For simulated formation oil-water displacement efficiency；R2For CO2Gas oil displacement efficiency；R3For surfactant oil displacement efficiency；R4For
CO2Gas oil displacement efficiency again；R5For CO2Gas+simulated formation oil-water displacement efficiency；R6For CO2Gas+foam solution oil displacement efficiency.
Compared with prior art, the invention has the following advantages that
(1) the characteristics of present invention is based on different displacement modes, fully considers the preservation of remaining oil after different displacement modes
State, specific aim carry out displacement mode combination and injection rate optimization, to improve the oil displacement efficiency in small duct in LOW PERMEABILITY RESERVOIR, finally
Achieve the purpose that improve strong vertical heterogeneity oil reservoir oil displacement effect.
(2) the advantages of present invention is directed to the permeability contrast degree of different oil reservoirs, fully considers obstructed displacement mode, passes through
A large amount of laboratory experiments, have obtained the efficient combination of each displacement mode, and indoor realization shows remarkable result.1 analytical table of example
Bright, although hypertonic rock core and the permeability ratio of low permeability cores are 73.43 times, final oil displacement efficiency differs only by 5.29%.
Detailed description of the invention
Fig. 1 is the nuclear magnetic resonance T of the low permeability cores under the different displacement modes of embodiment 12Spectrum.
Fig. 2 is the nuclear magnetic resonance T of the hypertonic rock core under the different displacement modes of embodiment 12Spectrum.
Fig. 3 is the low permeability cores oil displacement efficiency change curve under the different displacement modes of embodiment 1.
Fig. 4 is the hypertonic core flooding test efficiency curves under the different displacement modes of embodiment 1.
Specific embodiment
The invention will be described in further detail with reference to the accompanying drawings and examples, but is not intended as doing invention any limit
The foundation of system.
Certain oil field sample combination attached drawing is chosen below to be described in detail the present invention.
Embodiment 1
A kind of method for improving strong vertical heterogeneity oil reservoir oil displacement effect of the present invention the following steps are included:
Step 1: choosing diameter respectively is 2.5cm, each 1 piece of the hypertonic rock core and low permeability cores of length 5cm, gas is measured
Hypertonic core permeability is 514 × 10-3μm2, low permeability cores permeability is 7 × 10-3μm2, the permeability ratio of two blocks of rock cores is
73.43 times；
Step 2: preparing Mn2+Concentration is 15000mg/L experiment simulated formation water MnCl2Solution, formation water salinity are
300000mg/L；
Step 3: according to kerosene and in-place oil preparation experiment simulation oil, viscosity reaches 1.82mPa.s；
It is 8MPa in pressure Step 4: rock core is placed in high pressure saturation device, the time is 15 hours, it is made to be saturated mould
Quasi- water flooding, surveying hypertonic core porosity is 18.27%, pore volume 4.48ml, and low permeability cores porosity is 9.85%, hole
Gap volume is 2.41ml；Pore volume is calculated to realize by following formula:
V=π × r2×L×Φ (1)
Step 5: hypertonic rock core and low permeability cores is in parallel, under the conditions of temperature is 70 DEG C and confining pressure is 8MPa, with configuration
Experiment simulation oil displacement rock core establish initial oil saturation more than the difference displacements to 3 times of pore volumes of two blocks of rock cores,
Survey nuclear magnetic resonance T2Spectrum；As shown in FIGS. 1 and 2；
Step 6: with experiment simulated formation water MnCl2Solution with 0.1ml/min speed simultaneously two blocks of rock cores of displacement to rock
Heart clamp holder outlet end be only discharged it is not fuel-displaced until, survey nuclear magnetic resonance T2Spectrum, calculates separately the displacement of reservoir oil of hypertonic rock core, low permeability cores
Efficiency is respectively 23.73%, 13.45%；
Oil displacement efficiency is obtained by following formula:
In formula: R is oil displacement efficiency, %；SiFor the nuclear magnetic resonance T under a certain displacement mode2The area that spectrum is surrounded with X-axis；
SoNuclear magnetic resonance T when for rock core saturated oils2The area that spectrum is surrounded with X-axis.
Step 7: utilizing CO2Gas is with 0.1ml/min speed while two blocks of rock cores of displacement, until outlet port of rock core holder
Until not fuel-displaced, nuclear magnetic resonance T is surveyed2Spectrum, calculates separately hypertonic rock core according to formula (2), the oil displacement efficiency of low permeability cores is respectively
26.46%, 10.47%；As shown in Fig. 3,4；
Step 8: (surfactant is east to the surfactant for being 0.5% to flow in low permeability core implantation concentration with 0.1ml/min speed
Ying Guangmao petroleum technology Services Co., Ltd GMQ-5 surfactant is formulated by 0.5% mass percent) solution 0.3PV, surveys core
Magnetic resonance T2Spectrum, calculating low permeability cores oil displacement efficiency according to formula (2) is 2.97%；
Step 9: recycling CO2Gas is with 0.1ml/min speed while two blocks of rock cores of displacement, until core holding unit exports
Until end is not fuel-displaced, nuclear magnetic resonance T is surveyed2Spectrum calculates separately hypertonic rock core according to formula (2), the oil displacement efficiency of low permeability cores is distinguished
It is 4.7%, 28.24%；
Step 10: injecting CO with 0.1ml/min speed2The total 0.05PV of gas followed by injects mould with 0.1ml/min speed
The quasi- total 0.05PV of water flooding circuits sequentially 10 rounds of injection, while two blocks of rock cores of displacement do not go out to outlet port of rock core holder
Until oil, nuclear magnetic resonance T is surveyed2Spectrum, calculates separately hypertonic rock core according to formula (2), the oil displacement efficiency of low permeability cores is respectively
7.14%, 2.30%；
Step 11: injecting CO with 0.1ml/min speed2The total 0.05PV of gas is followed by with the injection of 0.1ml/min speed
(foam solution is that Hangzhou Zhongye Plant Technology Co., Ltd. ZYH-0860 foaming agent presses 0.5% mass to the total 0.05PV of foam solution
Percentage is formulated), 12 rounds of injection are circuited sequentially, nuclear magnetic resonance T is surveyed2Spectrum, calculates the drive of hypertonic rock core, low permeability cores
Oily efficiency is respectively 3.60%, 2.91%；
Step 12: the oil displacement efficiency under different displacement modes is added, the total displacement of reservoir oil effect of hypertonic rock core, low permeability cores is obtained
Rate is respectively 65.63%, 60.34%.
Displacement of reservoir oil gross efficiency is calculated to obtain by following formula:
RAlways=R1+R2+R3+R4+R5+R6
In formula: R1For simulated formation oil-water displacement efficiency；R2For CO2Gas oil displacement efficiency；R3For surfactant oil displacement efficiency；R4For
CO2Gas oil displacement efficiency again；R5For CO2Gas+simulated formation oil-water displacement efficiency；R6For CO2Gas+foam solution oil displacement efficiency.
Embodiment 2
A kind of method for improving strong vertical heterogeneity oil reservoir oil displacement effect of the present invention the following steps are included:
Step 1: choosing diameter respectively is 2.5cm, each 1 piece of the hypertonic rock core and low permeability cores of length 5cm, gas is measured
Hypertonic core permeability is 323 × 10-3μm2, low permeability cores permeability is 10.5 × 10-3μm2, the permeability ratio of two blocks of rock cores
It is 30.76 times；
Step 2: preparing Mn2+Concentration is 14000mg/L experiment simulated formation water MnCl2Solution, formation water salinity are
200000mg/L；
Step 3: according to kerosene and in-place oil preparation experiment simulation oil, viscosity reaches 1.16mPa.s；
It is 10MPa in pressure Step 4: rock core is placed in high pressure saturation device, the time is 12 hours, it is made to be saturated mould
Quasi- water flooding, surveying hypertonic core porosity is 16.04%, pore volume 3.93ml, and low permeability cores porosity is 10.33%,
Pore volume is 3.53ml；Pore volume is calculated to realize by following formula:
V=π × r2×L×Φ (1)
Step 5: hypertonic rock core and low permeability cores are in parallel, under the conditions of temperature is 70 DEG C and confining pressure is 10MPa, with matching
The experiment simulation oil displacement rock core set establishes initial oil saturation more than two pieces of rock core difference displacements to 3 times of pore volumes
Degree surveys nuclear magnetic resonance T2Spectrum；
Step 6: with experiment simulated formation water MnCl2Solution with 0.1ml/min speed simultaneously two blocks of rock cores of displacement to rock
Heart clamp holder outlet end be only discharged it is not fuel-displaced until, survey nuclear magnetic resonance T2Spectrum, calculates separately the displacement of reservoir oil of hypertonic rock core, low permeability cores
Efficiency is respectively 22.16%, 14.12%；
Oil displacement efficiency is obtained by following formula:
In formula: R is oil displacement efficiency, %；SiFor the nuclear magnetic resonance T under a certain displacement mode2The area that spectrum is surrounded with X-axis；
SoNuclear magnetic resonance T when for rock core saturated oils2The area that spectrum is surrounded with X-axis.
Step 7: utilizing CO2Gas is with 0.1ml/min speed while two blocks of rock cores of displacement, until outlet port of rock core holder
Until not fuel-displaced, nuclear magnetic resonance T is surveyed2Spectrum, calculates separately hypertonic rock core according to formula (2), the oil displacement efficiency of low permeability cores is respectively
23.63%, 12.31%；
Step 8: (surfactant is east to the surfactant for being 0.3% to flow in low permeability core implantation concentration with 0.1ml/min speed
Ying Guangmao petroleum technology Services Co., Ltd GMQ-5 surfactant is formulated by 0.3% mass percent) solution 0.5PV, surveys core
Magnetic resonance T2Spectrum, calculating low permeability cores oil displacement efficiency according to formula (2) is 3.11%；
Step 9: recycling CO2Gas is with 0.1ml/min speed while two blocks of rock cores of displacement, until core holding unit exports
Until end is not fuel-displaced, nuclear magnetic resonance T is surveyed2Spectrum calculates separately hypertonic rock core according to formula (2), the oil displacement efficiency of low permeability cores is distinguished
It is 5.9%, 27.33%；
Step 10: injecting CO with 0.1ml/min speed2The total 0.05PV of gas followed by injects mould with 0.1ml/min speed
The quasi- total 0.05PV of water flooding circuits sequentially 10 rounds of injection, while two blocks of rock cores of displacement do not go out to outlet port of rock core holder
Until oil, nuclear magnetic resonance T is surveyed2Spectrum, calculates separately hypertonic rock core according to formula (2), the oil displacement efficiency of low permeability cores is respectively
9.05%, 2.24%；
Step 11: injecting CO with 0.1ml/min speed2The total 0.05PV of gas is followed by with the injection of 0.1ml/min speed
(foam solution is that Hangzhou Zhongye Plant Technology Co., Ltd. ZYH-0860 foaming agent presses 0.3% mass to the total 0.05PV of foam solution
Percentage is formulated), 12 rounds of injection are circuited sequentially, nuclear magnetic resonance T is surveyed2Spectrum, calculates the drive of hypertonic rock core, low permeability cores
Oily efficiency is respectively 4.43%, 2.85%；
Step 12: the oil displacement efficiency under different displacement modes is added, the total displacement of reservoir oil effect of hypertonic rock core, low permeability cores is obtained
Rate is respectively 65.17%, 6.96%.
Displacement of reservoir oil gross efficiency is calculated to obtain by following formula:
RAlways=R1+R2+R3+R4+R5+R6
In formula: R1For simulated formation oil-water displacement efficiency；R2For CO2Gas oil displacement efficiency；R3For surfactant oil displacement efficiency；R4For
CO2Gas oil displacement efficiency again；R5For CO2Gas+simulated formation oil-water displacement efficiency；R6For CO2Gas+foam solution oil displacement efficiency.
Embodiment 3
A kind of method for improving strong vertical heterogeneity oil reservoir oil displacement effect of the present invention the following steps are included:
Step 1: choosing diameter respectively is 2.5cm, each 1 piece between the hypertonic rock core and low permeability cores of 5cm of length, gas is surveyed
Obtaining hypertonic core permeability is 76 × 10-3μm2, low permeability cores permeability is 5 × 10-3μm2, the permeability ratio of two blocks of rock cores
It is 15.2 times；
Step 2: preparing Mn2+Concentration is 16000mg/L experiment simulated formation water MnCl2Solution, formation water salinity are
400000mg/L；
Step 3: according to kerosene and in-place oil preparation experiment simulation oil, viscosity reaches 1.01mPa.s；
It is 12MPa in pressure Step 4: rock core is placed in high pressure saturation device, the time is 10 hours, it is made to be saturated mould
Quasi- water flooding, surveying hypertonic core porosity is 14.27%, pore volume 3.50ml, and low permeability cores porosity is 9.43%, hole
Gap volume is 2.31ml；Pore volume is calculated to realize by following formula:
V=π × r2×L×Φ (1)
Step 5: hypertonic rock core and low permeability cores are in parallel, under the conditions of temperature is 70 DEG C and confining pressure is 12MPa, with matching
The experiment simulation oil displacement rock core set establishes initial oil saturation more than two pieces of rock core difference displacements to 3 times of pore volumes
Degree surveys nuclear magnetic resonance T2Spectrum；
Step 6: with experiment simulated formation water MnCl2Solution with 0.1ml/min speed simultaneously two blocks of rock cores of displacement to rock
Heart clamp holder outlet end be only discharged it is not fuel-displaced until, survey nuclear magnetic resonance T2Spectrum, calculates separately the displacement of reservoir oil of hypertonic rock core, low permeability cores
Efficiency is respectively 26.02%, 16.77%；
Oil displacement efficiency is obtained by following formula:
In formula: R is oil displacement efficiency, %；SiFor the nuclear magnetic resonance T under a certain displacement mode2The area that spectrum is surrounded with X-axis；
SoNuclear magnetic resonance T when for rock core saturated oils2The area that spectrum is surrounded with X-axis.
Step 7: utilizing CO2Gas is with 0.1ml/min speed while two blocks of rock cores of displacement, until outlet port of rock core holder
Until not fuel-displaced, nuclear magnetic resonance T is surveyed2Spectrum, calculates separately hypertonic rock core according to formula (2), the oil displacement efficiency of low permeability cores is respectively
24.54%, 14.26%；
Step 8: (surfactant is east to the surfactant for being 0.7% to flow in low permeability core implantation concentration with 0.1ml/min speed
Ying Guangmao petroleum technology Services Co., Ltd GMQ-5 surfactant is formulated by 0.7% mass percent) solution 0.2PV, surveys core
Magnetic resonance T2Spectrum, calculating low permeability cores oil displacement efficiency according to formula (2) is 2.21%；
Step 9: recycling CO2Gas is with 0.1ml/min speed while two blocks of rock cores of displacement, until core holding unit exports
Until end is not fuel-displaced, nuclear magnetic resonance T is surveyed2Spectrum calculates separately hypertonic rock core according to formula (2), the oil displacement efficiency of low permeability cores is distinguished
It is 7.3%, 25.11%；
Step 10: injecting CO with 0.1ml/min speed2The total 0.05PV of gas followed by injects mould with 0.1ml/min speed
The quasi- total 0.05PV of water flooding circuits sequentially 10 rounds of injection, while two blocks of rock cores of displacement do not go out to outlet port of rock core holder
Until oil, nuclear magnetic resonance T is surveyed2Spectrum, calculates separately hypertonic rock core according to formula (2), the oil displacement efficiency of low permeability cores is respectively
5.37%, 3.15%；
Step 11: injecting CO with 0.1ml/min speed2The total 0.05PV of gas is followed by with the injection of 0.1ml/min speed
(foam solution is that Hangzhou Zhongye Plant Technology Co., Ltd. ZYH-0860 foaming agent presses 0.7% mass to the total 0.05PV of foam solution
Percentage is formulated), 12 rounds of injection are circuited sequentially, nuclear magnetic resonance T is surveyed2Spectrum, calculates the drive of hypertonic rock core, low permeability cores
Oily efficiency is respectively 2.73%, 2.64%；
Step 12: the oil displacement efficiency under different displacement modes is added, the total displacement of reservoir oil effect of hypertonic rock core, low permeability cores is obtained
Rate is respectively 65.96%, 64.14%.
Displacement of reservoir oil gross efficiency is calculated to obtain by following formula:
RAlways=R1+R2+R3+R4+R5+R6
In formula: R1For simulated formation oil-water displacement efficiency；R2For CO2Gas oil displacement efficiency；R3For surfactant oil displacement efficiency；R4For
CO2Gas oil displacement efficiency again；R5For CO2Gas+simulated formation oil-water displacement efficiency；R6For CO2Gas+foam solution oil displacement efficiency.
The principle explanation of experimental method
For strong heterogeneous reservoir, since high permeability reservoir macropore content is high, and the small duct of LOW PERMEABILITY RESERVOIR contains
Amount is high.So during waterflooding extraction, under the conditions of same injection pressure, injected media mostly along the macropore of high permeability reservoir forward
It promotes, and bypasses the small duct of LOW PERMEABILITY RESERVOIR, a large amount of residual oil preservation in the small duct of LOW PERMEABILITY RESERVOIR is caused, when injected media exists
After high permeability reservoir has formed continuous seepage channel, obvious expansion is had no with the range that involves of the increase injected media of injection rate.
Although our original intention is desirable to multiple displacement and gets through more pore throats, especially some apertures and dead hole, it turns out that, injection
Medium always moves ahead along the lesser macropore of the filtrational resistance formed in high permeability reservoir, for the aperture of LOW PERMEABILITY RESERVOIR
Road, the range very little of entrance, it is difficult to play expansion swept volume, improve the purpose of oil displacement efficiency.This, which just needs to adjust in time, drives
For the crude oil development degree in mode, the raising small duct of LOW PERMEABILITY RESERVOIR.Surfactant can reduce oil water interfacial tension, reduce rock
The boundary fluid layer thickness of particle surface, improves CO2Percolation ability of the gas in small pore throat, while CO2Into after small duct
Surfactant can be brought into other small ducts again, increase the sphere of action of surfactant, in addition CO2The air water of+simulated formation water
Alternately injection and CO2+ foam solution alternating injection can macropore plugging, improve the Flooding Efficiency in small duct.This combination
Displacement mode has achieved the purpose that the final strong vertical heterogeneity oil reservoir oil displacement effect of raising.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
A specific embodiment of the invention is only limitted to this, for those of ordinary skill in the art to which the present invention belongs, is not taking off
Under the premise of from present inventive concept, several simple deduction or replace can also be made, all shall be regarded as belonging to the present invention by institute
Claims of submission determine scope of patent protection.
Claims (9)
1. a kind of method for improving strong vertical heterogeneity oil reservoir oil displacement effect, which is characterized in that include the following steps:
Step 1: choosing hypertonic rock core and each 1 piece of low permeability cores respectively, the permeability ratio of hypertonic rock core and low permeability cores is greater than
10；
Step 2: preparing Mn2+Experiment simulated formation water, reaches formation water salinity；
Step 3: reaching crude oil viscosity according to kerosene and in-place oil preparation experiment simulation oil；
Step 4: rock core is placed in high pressure saturation device, it is made to be saturated Mn2+Simulated formation water, gaging hole porosity calculate pore-body
Product；
Step 5: hypertonic rock core and low permeability cores is in parallel, under the conditions of identical simulated formation temperature and pressure, with configuration
Simulation oil displacement rock core is tested, more than two pieces of rock core difference displacements to 3 times of pore volumes, initial oil saturation is established, surveys
Nuclear magnetic resonance T2Spectrum；
Step 6: using Mn2+Simulated formation water two blocks of rock cores of displacement are only discharged to outlet port of rock core holder and not fuel-displaced are simultaneously
Only, nuclear magnetic resonance T is surveyed2Spectrum calculates oil displacement efficiency；
Step 7: utilizing CO2Two blocks of rock cores of displacement survey nuclear magnetic resonance until outlet port of rock core holder is not fuel-displaced to gas simultaneously
T2Spectrum calculates oil displacement efficiency；
Step 8: injecting surfactant solution to flow in low permeability core, nuclear magnetic resonance T is surveyed2Spectrum calculates oil displacement efficiency；
Step 9: recycling CO2It is total to survey nuclear-magnetism until outlet port of rock core holder is not fuel-displaced to gas for two blocks of rock cores of displacement simultaneously
Shake T2Spectrum calculates oil displacement efficiency；
Step 10: injecting CO with certain speed2Gas certain volume is followed by certain with certain speed injection simulated formation water
Volume circuits sequentially 10 rounds of injection, while two blocks of rock cores of displacement survey nuclear-magnetism until outlet port of rock core holder is not fuel-displaced
Resonate T2Spectrum calculates oil displacement efficiency；
Step 11: injecting CO with certain speed2Gas certain volume followed by injects foam solution certain volume with certain speed,
12 rounds of injection are circuited sequentially, nuclear magnetic resonance T is surveyed2Spectrum calculates oil displacement efficiency；
Step 12: the oil displacement efficiency under different displacement modes is added, the total oil displacement efficiency of hypertonic rock core, low permeability cores is obtained.
2. the method according to claim 1 for improving strong vertical heterogeneity oil reservoir oil displacement effect, which is characterized in that described
Mn2+Simulated formation aqueous solution is the salt containing manganese ion that concentration is 14000-16000mg/L, is MnCl2。
3. the method according to claim 1 for improving strong vertical heterogeneity oil reservoir oil displacement effect, which is characterized in that described
Reach the formation water salinity that formation water salinity is oil reservoir where coring, the crude oil viscosity that reaches is is taken rock
The stratigraphic oil fields viscosity of crude of oil reservoir where the heart.
4. the method according to claim 1 for improving strong vertical heterogeneity oil reservoir oil displacement effect, which is characterized in that described
Rock core is placed in high pressure saturation device, pressure 8-12MPa, the time is 10-15 hours, makes its saturation simulation water flooding.
5. the method according to claim 1 for improving strong vertical heterogeneity oil reservoir oil displacement effect, which is characterized in that described
In step 4, calculates pore volume and is realized by following formula:
V=π × r2×L×Φ
In formula: V is rock pore volume, cm3；R is core diameter, cm；L is rock core length, cm；Φ is core porosity, %.
6. the method according to claim 1 for improving strong vertical heterogeneity oil reservoir oil displacement effect, which is characterized in that described
In step 6~step 11, with 0.1ml/min speed displacement rock core；CO is injected in step 102The total 0.05PV of gas is followed by
The total 0.05PV of simulated formation water is injected with certain speed；CO is injected in step 112The total 0.05PV of gas is followed by with certain
Speed injects the total 0.05PV of foam solution.
7. the method according to claim 1 for improving strong vertical heterogeneity oil reservoir oil displacement effect, which is characterized in that described
In step 11, foam solution is that 0.3-0.7% is formulated ZYH-0860 foaming agent by mass percentage.
8. the method according to claim 1 for improving strong vertical heterogeneity oil reservoir oil displacement effect, which is characterized in that described
Oil displacement efficiency is calculated to realize by following formula:
In formula: R is oil displacement efficiency, %；SiFor the nuclear magnetic resonance T under a certain displacement mode2The area that spectrum is surrounded with X-axis；SoFor
Nuclear magnetic resonance T when rock core saturated oils2The area that spectrum is surrounded with X-axis.
9. the method according to claim 1 for improving strong vertical heterogeneity oil reservoir oil displacement effect, which is characterized in that calculate
Displacement of reservoir oil gross efficiency is realized by following formula:
RAlways=R1+R2+R3+R4+R5+R6
In formula: R1For simulated formation oil-water displacement efficiency；R2For CO2Gas oil displacement efficiency；R3For surfactant oil displacement efficiency；R4For CO2
Gas oil displacement efficiency again；R5For CO2Gas+simulated formation oil-water displacement efficiency；R6For CO2Gas+foam solution oil displacement efficiency.
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