CN110243744A - A kind of method of quantitative assessment pressure reduction difference size hole recovery extent - Google Patents
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- 238000011084 recovery Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000009467 reduction Effects 0.000 title claims abstract description 16
- 239000011148 porous material Substances 0.000 claims abstract description 41
- 238000005481 NMR spectroscopy Methods 0.000 claims abstract description 27
- 238000001228 spectrum Methods 0.000 claims abstract description 22
- 239000008398 formation water Substances 0.000 claims abstract description 14
- 238000006073 displacement reaction Methods 0.000 claims abstract description 7
- 239000011435 rock Substances 0.000 claims abstract description 7
- 238000004088 simulation Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000004364 calculation method Methods 0.000 claims description 8
- 238000002347 injection Methods 0.000 abstract description 3
- 239000007924 injection Substances 0.000 abstract description 3
- 230000000452 restraining effect Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 12
- 230000035699 permeability Effects 0.000 description 10
- 238000011156 evaluation Methods 0.000 description 6
- 230000035945 sensitivity Effects 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
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- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
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- 239000003345 natural gas Substances 0.000 description 2
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- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010429 evolutionary process Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000011158 quantitative evaluation Methods 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 238000010206 sensitivity analysis Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
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- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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Abstract
A kind of method of quantitative assessment pressure reduction difference size hole recovery extent, after rock core saturation simulation water flooding, injection simulated formation water carries out displacement, increases confining pressure to oil-gas reservoir pressure, surveys nuclear magnetic resonance T after stablizing2Spectrum；Confining pressure is reduced, simulated formation water is persistently injected, surveys nuclear magnetic resonance T2Spectrum；By the nuclear magnetic resonance T under different confining pressures2Spectrum is plotted on same figure；It is divided into several sections and represents various sizes of hole；Calculate separately pore volume；Obtain hole recovery coefficient, the pressure difference under different confining pressures, the pore volume under different confining pressures and the pore volume ratio under maximum confining pressure；And linear fit is carried out to data point；The slope of total pore space and different size holes, as hole recovery coefficient are obtained according to linear fit formula；It compares different size holes and determines influence of the different size holes to total pore space recovery extent from the difference of total pore space recovery coefficient；The present invention inherently recognizes the recovery process and its restraining factors of interstitial space in pressure reduction.
Description
Technical field
The present invention relates to oil gas development technology field, in particular to a kind of quantitative assessment pressure reduction difference size hole is extensive
The method of multiple degree.
Background technique
In developing of reservoirs, generally existing stress sensitive phenomenon, in order to reduce stress sensitive injury, Chang Cai as far as possible
With injection fluid or intermission mining method to restore reservoir fluid pressure, reduce effective confining pressure.But due to pressurized process
Middle part Pore Pressure compression deformation, it is difficult to be effectively restored, cause the recovery extent of different size holes widely different.Therefore,
How the recovery extent of quantitative assessment difference size hole, and determine its influence to total pore space recovery extent, for guidance oil
Gas reservoir rationally produces system formulation and is of great significance.
In existing research, CN201510117706.0 discloses that a kind of stress sensitive reservoir based on fractal theory is opposite to be seeped
Saturating rate calculation method, CN201710229148.6 disclose a kind of determination method and apparatus of reservoir stress sensitivity,
CN201210213535.8 discloses a kind of method for determining Fractured low permeability reservoir stress sensitivity based on Scale Model,
CN201810057471.4 discloses a kind of reservoir permeability method for establishing model based on Stress sensitivity analysis,
CN201810763909.0 discloses a kind of shale apparent permeability calculation method for considering stress sensitive effect,
CN201811079914.6 discloses a kind of method based on nuclear magnetic resonance technique evaluation tight sandstone reservoir stress sensitive,
CN201410174667.3 discloses a kind of method of pore throat variation degree during quantitative assessment stress sensitive,
CN201810789897.9 discloses a kind of apparent permeability calculation method for considering shale pore-size distribution feature,
CN201610064446.X discloses a kind of determining crack rock permeability to the method for effective stress sensitivity.2010 6
Month, natural gas geoscience, Yan Fengming et al. has carried out crack-hole type carbonate reservoir Lab research on stress sensitivity；
In May, 2011, petroleum journal, Jiao Chunyan et al. have carried out super-low permeability sandstone reservoir stress sensitivity experimental evaluation；2013 4
Month, Petroleum finance, Zhao Lun et al. has carried out abnormal high pressure Carbonate Reservoir stress sensitive using artificial core and has tested
Evaluation；2 months 2015, petroleum journal, Zhang Rui et al. had studied the stress sensitive phenomenon and its mechanism of shale permeability；2016
May, natural gas geoscience, Zhu Weiyao et al. have studied shale reservoir stress sensitivity and its influence on production capacity；2017 1
Month, Chinese Journal of Rock Mechanics and Engineering, nest will is bright et al. to be had studied prismatical joint rock mass and permeates under multiple confining pressure cyclic loading and unloading
The Evolution of rate and porosity.
Above-mentioned main problem is: (1) it is existing to study the restoration evaluation for focusing primarily upon porosity and permeability, do not have
About the quantitative evaluation method of hole recovery extent in pressure reduction；(2) existing research is mainly with hole under different confining pressures
Degree and measurement index of the resume permeability rate as recovery extent, do not propose the calculation method of hole recovery coefficient.
Summary of the invention
To solve drawbacks described above existing in the prior art, the purpose of the present invention is to provide a kind of quantitative assessments to be depressured
The method of Cheng Butong size hole recovery extent, the essential reason that stress sensitive occurs from oil-gas reservoir is started with, different by evaluation
Recovery extent of the different size holes in pressure reduction reacts hole recovery process under confining pressure, passes through total pore space and different rulers
Very little hole recovery coefficient and its difference evaluate the principal element for restricting hole and restoring.
In order to achieve the above object, the present invention is realized by following technical proposals:
A kind of method of quantitative assessment pressure reduction difference size hole recovery extent, includes the following steps:
Step 1: configuration simulated formation water, reaches formation water salinity requirement；
Step 2: being that 2.5cm is placed in nuclear magnetic resonance high temperature after length is the rock core saturation simulation water flooding of 4cm by diameter
High pressure displacement system persistently injects simulated formation water and carries out displacement, and temperature is oil-gas reservoir temperature, is slowly increased confining pressure to oil-gas reservoir
Pressure after stablizing 30min, surveys nuclear magnetic resonance T2Spectrum；
Step 3: according to the pressure intervals of 1-3MPa, confining pressure is reduced to 2.5MPa, stablizes 60min under each confining pressure, and hold
Continuous injection simulated formation water, surveys nuclear magnetic resonance T2Spectrum；
Step 4: by the nuclear magnetic resonance T under different confining pressures2Spectrum is plotted on same figure；
Step 5: according to nuclear magnetic resonance T2The size of value, by nuclear magnetic resonance T2Spectrum is divided into several sections, respectively represents not
With the hole of size；
Step 6: counting the T of different size holes under different confining pressures respectively2The size of spectrum and X-axis surround the area, as hole
Gap volume；
Step 7: obtaining the calculation method of hole recovery coefficient according to formula (1), formula (2)；
In formula: PiIndicate different confining pressures；
PmIndicate maximum confining pressure；
ViIndicate the volume of different size holes under different confining pressures；
VmIndicate the volume of different size holes under maximum confining pressure；
RPIndicate hole recovery coefficient.
Step 8: calculating separately the pressure difference P under different confining pressuresi-Pm；
Step 9: according to total pore space and various sizes of hole section, calculate separately pore volume under different confining pressures with
Pore volume ratio Ln=V under maximum confining pressurei/Vm；
Step 10: doing Y-axis is Ln=Vi/Vm, X-axis Pi-PmFigure, and to data point carry out linear fit, obtain total hole
The linear fit formula of gap and different size holes；
Step 11: obtaining the slope of total pore space and different size holes according to linear fit formula, as hole restores
Coefficient；
Step 12: comparing the difference of different size holes and total pore space recovery coefficient, determine different size holes to total
The influence of hole recovery extent.
Compared with prior art, the invention has the following advantages that
Oil-gas reservoir by stress sensitive injure after, in order to evaluate reduce confining pressure during oil-gas reservoir reservoir space recovery feelings
Condition, conventional method are mainly to evaluate the variation of pressure reduction porosity and permeability, but the two parameters are that oil-gas reservoir is micro-
The macro manifestations of view hole gap spatial variations, cannot inherently in reaction oil gas reservoir pressure reduction different aperture recovery extent,
It is even more impossible to obtain influence of the different scale hole to total pore space recovery extent.The present invention innovatively utilizes nuclear magnetic resonance technique anti-
Proton content is answered, and then represents interstitial space variation, and T2There are the principles of one-to-one relationship for value and pore-size, with decompression
T in the process2Value and T2The variation of spectral amplitude characterizes the variation of reservoir space, and specific aim propose hole recovery coefficient this
New parameter, this recovery process and its restraining factors for inherently recognizing interstitial space in pressure reduction, and then instruct oil
Gas reservoir scientific development is worth with important references.
Detailed description of the invention
Fig. 1 is the nuclear magnetic resonance T in embodiment pressure reduction under different confining pressures2Spectrogram.
Fig. 2 is embodiment Ln (Vi/Vm) and (Pi-Pm) data fitted figure.
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 core sample combination attached drawing is chosen below to be described in detail the present invention.
A kind of method of quantitative assessment pressure reduction difference size hole recovery extent, comprising the following steps:
Step 1: configuration simulated formation water, formation water salinity reach 30000mg/L；
Step 2: being that 2.5cm is placed in nuclear magnetic resonance high temperature after length is the rock core saturation simulation water flooding of 4cm by diameter
High pressure displacement system persistently injects simulated formation water and carries out displacement, and temperature is 55 DEG C, is slowly increased confining pressure to 18MPa, stablizes
After 60min, nuclear magnetic resonance T is surveyed2Spectrum；
Step 3: slowly reduce confining pressure according to the pressure intervals of 1-3MPa, confining pressure 14MPa, 11MPa, 9MPa, 7MPa,
Stable 60min respectively under 5MPa, 3.5MPa, 2.5MPa, and continue to inject simulated formation water, survey nuclear magnetic resonance T2Spectrum；
Step 4: by the nuclear magnetic resonance T under different confining pressures2Spectrum is plotted on same figure；
Step 5: according to nuclear magnetic resonance T2The size of value, by nuclear magnetic resonance T2Spectrum is divided into 2 sections, T2Value is greater than 10ms generation
Table macrovoid, T2Value is less than 10ms and represents fine pore；
Step 6: statistics confining pressure is macropore under 18MPa, 14MPa, 11MPa, 9MPa, 7MPa, 5MPa, 3.5MPa, 2.5MPa
The T of gap2Spectrum and X-axis surround the area be respectively 123.55,146.02,142.76,151.56,143.43,167.99,176.46,
181.05 the T of fine pore2Spectrum and X-axis surround the area be respectively 238.15,254.03,257.37,256.77,274.93,
288.10,286.33,285.67；
Step 7: obtaining the calculation method of hole recovery coefficient according to formula (1), formula (2)；
In formula: PiIndicate different confining pressures；
PmIndicate maximum confining pressure；
ViIndicate the volume of different size holes under different confining pressures；
VmIndicate the volume of different size holes under maximum confining pressure；
RPIndicate hole recovery coefficient.
Step 8: calculating the pressure under confining pressure 18MPa, 14MPa, 11MPa, 9MPa, 7MPa, 5MPa, 3.5MPa, 2.5MPa
Difference (Pi-Pm), respectively 0MPa, 4MPa, 7MPa, 9MPa, 11MPa, 13MPa, 14.5MPa, 15.5MPa；
Step 9: according to total pore space and macrovoid, fine pore section, calculate confining pressure 18MPa, 14MPa, 11MPa, 9MPa,
Ln (the V of total pore space under 7MPa, 5MPa, 3.5MPa, 2.5MPai/Vm) be respectively 0.0000,0.0337,0.0351,0.0442,
0.0546,0.0908,0.0984,0.1010, macroporous Ln (Vi/Vm) be respectively 0.0000,0.0726,0.0628,
0.0887,0.0648,0.1334,0.1548,0.1660, the Ln (V of fine porei/Vm) be respectively 0.0000,0.0280,
0.0337,0.0327,0.0624,0.0827,0.0822,0.0790；
Step 10: doing Y-axis is Ln (Vi/Vm), X-axis is (Pi-Pm) figure, and linear fit is carried out to data point, obtained total
Hole, macrovoid and the linear fit of fine pore formula are respectively y=0.0065x-0.0031, y=0.0095x+0.005, y=
0.0055x-0.0006；
Step 11: be respectively 0.0065 according to the slope that linear fit formula obtains total pore space, macrovoid and fine pore,
0.0095,0.0055, the hole recovery coefficient for obtaining total pore space, macrovoid and fine pore is respectively 0.0065MPa-1、
0.0095MPa-1、0.0055MPa-1；
Step 12: the difference of comparison macrovoid, fine pore and total pore space recovery coefficient is respectively 0.0030MPa-1、
0.0010MPa-1, determine that influence of the macrovoid to total pore space recovery extent is small, influence of the fine pore to total pore space recovery extent is big.
The principle explanation of experimental method
After oil-gas reservoir is pressurized, hole can be pressurized and be deformed, and interstitial space can reduce therewith, if reducing effective confining pressure,
Hole can be restored to a certain extent again, but there are significant differences for various sizes of hole its recovery extent, cause
The recovery extent of total pore space is also different, how to evaluate the recovery extent of different size holes, and determines it to total pore space
The influence of recovery is the difficult point studied at present.
The present invention is according to nuclear magnetic resonance measuring technology principle, with T2Value reaction pore-size, with T2The amplitude of spectrum reacts hole
The variation in space.Whole experiment process simulated formation actual conditions are gradually decreased by maximum oil-gas reservoir pressure, and continue a timing
Between after survey nuclear magnetic resonance T again2Spectrum, according to nuclear magnetic resonance T under different confining pressures2Spectrum is to reflect different size holes in pressure reduction
Spatial variations and evolutionary process, inherently disclose pressure reduction in mouth interstitial space mechanism of Evolution, meanwhile, based on experiment
As a result the innovative hole recovery coefficient and its calculation method for proposing to measure recovery capability, gives different size holes to total hole
The evaluation method that gap recovery extent influences, this is for instructing Reservoir Development to have great importance and value.
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 (1)
1. a kind of method of quantitative assessment pressure reduction difference size hole recovery extent, which is characterized in that include the following steps:
Step 1: configuration simulated formation water, reaches formation water salinity requirement；
Step 2: being that 2.5cm is placed in nuclear magnetic resonance high temperature and pressure after length is the rock core saturation simulation water flooding of 4cm by diameter
Displacement system persistently injects simulated formation water and carries out displacement, and temperature is oil-gas reservoir temperature, is slowly increased confining pressure to oil-gas reservoir pressure
Power after stablizing 30min, surveys nuclear magnetic resonance T2Spectrum；
Step 3: according to the pressure intervals of 1-3MPa, confining pressure is reduced to 2.5MPa, stablizes 60min under each confining pressure, and continue to infuse
Enter simulated formation water, surveys nuclear magnetic resonance T2Spectrum；
Step 4: by the nuclear magnetic resonance T under different confining pressures2Spectrum is plotted on same figure；
Step 5: according to nuclear magnetic resonance T2The size of value, by nuclear magnetic resonance T2Spectrum is divided into several sections, respectively represents different rulers
Very little hole；
Step 6: counting the T of different size holes under different confining pressures respectively2The size of spectrum and X-axis surround the area, as pore-body
Product；
Step 7: obtaining the calculation method of hole recovery coefficient according to formula (1), formula (2):
In formula: PiIndicate different confining pressures；
PmIndicate maximum confining pressure；
ViIndicate the volume of different size holes under different confining pressures；
VmIndicate the volume of different size holes under maximum confining pressure；
RPIndicate hole recovery coefficient；
Step 8: calculating separately the pressure difference P under different confining pressuresi-Pm；
Step 9: calculating separately the pore volume and maximum under different confining pressures according to total pore space and various sizes of hole section
Pore volume ratio Ln=V under confining pressurei/Vm；
Step 10: doing Y-axis is Ln=Vi/Vm, X-axis Pi-PmFigure, and to data point carry out linear fit, obtain total pore space and
The linear fit formula of different size holes；
Step 11: obtaining the slope of total pore space and different size holes, as hole recovery coefficient according to linear fit formula；
Step 12: comparing the difference of different size holes and total pore space recovery coefficient, determine different size holes to total pore space
The influence of recovery extent.
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| CN112129802A (en) * | 2020-10-22 | 2020-12-25 | 重庆科技学院 | Quantitative analysis method for volume increment of different-scale pores of hydrated shale |
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Application publication date: 20190917 |