CN109239119A - A method of tight sandstone reservoir stress sensitive is evaluated based on nuclear magnetic resonance technique - Google Patents
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Abstract
The present invention relates to a kind of methods for evaluating sandstone reservoir stress sensitive, are a kind of methods based on nuclear magnetic resonance technique evaluation tight sandstone reservoir stress sensitive specifically.It includes step 1: the rock core of preparation experiment sandstone；Step 2: nuclear-magnetism porosity calculation model is established；Step 3: the oil phase volume V of rock core is calculated0；Step 4: setting experiment primary condition；Step 5: the nuclear-magnetism T2 map of rock core and out oil volume are tested under the conditions of different back pressure；Step 6: the recovery ratio and nuclear-magnetism permeability of rock core are calculated；Step 7: the change rate of the nuclear-magnetism permeability of rock core under different net impacts is calculated.Test period of the invention is short, can analyze the inherent mechanism of reservoir stress sensitive, and can carry out stress sensitive experiment to same rock core and test with recovery ratio.
Description
Technical field
The present invention relates to a kind of methods for evaluating sandstone reservoir stress sensitive, are a kind of based on nuclear magnetic resonance specifically
The method of technology evaluation tight sandstone reservoir stress sensitive.
Background technique
Oil-gas reservoir reservoir stress sensitive refers to rock itself hole knot caused by the change with reservoir stress state
The phenomenon that structure changes, the change that macro manifestations occur in parameters such as porosity, nuclear-magnetism permeability, resistivity, Young's modulus
Change.In developing of reservoirs, people are especially concerned about that reservoir stress state changes the variation pair of caused related property parameter
The influence of Oil & Gas Productivity and ultimate recovery, and nuclear-magnetism permeability and above problem relationship are the closest, therefore generally often will
The stress sensitivity of oil and gas reservoir nuclear-magnetism permeability is referred to as reservoir stress sensitive.
Existing stress sensitive test method changes the net impact loaded on rock core by changing rock core internal pressure or confining pressure, and
The stress-sensitive index of rock core is calculated according to the nuclear-magnetism permeability value under the different net impacts of test.But this test method is time-consuming
Longer, according to professional standard, the net impact point of experimental setup cannot be less than 5, the net impact point of each setting test up to
Stablize the time within maintenance 30 minutes or more less, for tight sand rock sample, it is then longer to stablize the time；And this test method is only capable of
The variation of reservoir penetrating power is reacted, cannot intuitively react the structure feature of these reservoirs, therefore change without method interpretation stress sensitive
Inherent mechanism, be unfavorable for researching and analysing；In addition, this method is unsatisfactory for single-factor variable rule, rock core hole knot is changed
Structure cannot realize simultaneously the analysis of stress sensitive and recovery ratio in same rock core, can only obtain adopting for rock core additionally by experiment
Yield, the process entirely tested are complex cumbersome.
Summary of the invention
Object of the present invention is to be intended to provide a kind of side based on nuclear magnetic resonance technique evaluation tight sandstone reservoir stress sensitive
Method, it is long for solving experimental period existing in the prior art, the inherent mechanism of reservoir stress sensitive cannot be analyzed, and cannot be
Same rock core realizes the problem of stress sensitive and recovery ratio are analyzed simultaneously.
To realize the above-mentioned technical purpose, The technical solution adopted by the invention is as follows:
A method of tight sandstone reservoir stress sensitive is evaluated based on nuclear magnetic resonance technique, is included the following steps:
Step 1: the rock core of preparation experiment sandstone；
The rock core of columned sandstone is dried, then weighs the dry weight of rock core；Rock core is placed in closed container later
It vacuumizes 48 hours, add water flooding and persistently vacuumizes until rock core is saturated.
Step 2: nuclear-magnetism porosity calculation model is established；
The nuclear-magnetism T2 map of the titer of at least three groups Different porosities is tested respectively, and according to nuclear-magnetism T2Map calculates
Test unit signal amount used, then establishes nuclear-magnetism hole according to linear relationship between unit signal amount and nuclear-magnetism porosity
Spend computation model；The unit signal amount is the resultant signal amount of test acquisition divided by the volume of titer, and resultant signal amount is according to nuclear-magnetism
T2The areal calculation that graphs are wrapped up.
Step 3: the oil phase volume of rock core is calculated；
The weight Mw of rock core obtained in step 1 is weighed, is then saturated rock core using crude oil, then weigh saturation crude oil
The weight Mwo of rock core afterwards simultaneously tests nuclear-magnetism T2 map, is calculated under irreducible water saturation oil condition according to grease density variation later
Oil phase volume Vo, calculation formula are as follows: V0=(MW-Mwo)/(ρw-ρo), in which: ρwFor the density of water, ρoFor the density of crude oil.
Step 4: setting experiment primary condition；
Rock core is put into clamper, and applies the back pressure of 20MPa to rock core outlet end, alternately promotes enclosing for rock core later
Pressure and stream pressure, and pressure difference during boosting between confining pressure and stream pressure is no more than 2MPa, stops when stream pressure rises to 20MPa
Only, the then nuclear-magnetism T2 map of re-test rock core；The back pressure refers to that the pressure of rock core outlet section, confining pressure refer to radial loaded in rock core
Pressure, stream pressure refer to core entry section pressure and outlet pressures sum average value.
Step 5: the nuclear-magnetism T2 map of rock core and out oil volume are tested under the conditions of different back pressure；
The gradually equivalent back pressure for reducing rock core outlet end, and under the conditions of each back pressure testing rock core nuclear-magnetism T2 map
Oil volume out, the process of the test are as follows: using water flooding with the displacement pressure difference displacement rock core of 2MPa to outlet section it is not fuel-displaced after,
Oil volume is recorded out, displacement pump, the nuclear-magnetism T2 map of testing rock core when in rock core without displacement pressure difference are turned off；The displacement pressure
Difference of the difference between inlet pressure and back pressure；
Step 6: the recovery ratio and nuclear-magnetism permeability of rock core are calculated；
The recovery ratio of rock core passes through the ratio calculation gone out between oil volume and oil phase volume Vo after displacement；The nuclear-magnetism of rock core
Permeability is calculated by the SDR model of nuclear magnetic resonance core analysis and well logging field, the expression formula of the model are as follows: KNMR=30 φ4T2g 2, in which: KNMRFor nuclear-magnetism permeability, T2The geometrical mean in g relaxation time andφ is nuclear-magnetism hole
Porosity.
Step 7: the change rate of rock core nuclear-magnetism permeability under different net impacts is calculated；
According to formulaCalculate the change rate of rock core nuclear-magnetism permeability, in which: D represents rock core nuclear-magnetism
The change rate of permeability, the nuclear-magnetism permeability of rock core, Ki represent rock core under different net impacts when Ko represents net impact as 0Mpa
Nuclear-magnetism permeability.
The present invention due to above-mentioned design advantageously: method using nuclear magnetic resonance is according to testing different net impacts
The nuclear-magnetism T2 map of lower rock core, the percolation ability of rock core is calculated using SDR model, and test process only needs rock core pressure at two ends steady
Fixed, the flowing without waiting for liquid in rock core is stablized, and greatly reduces the testing time；And nuclear-magnetism T2Map directly reflects storage
The distribution of layer fluid compares the nuclear-magnetism T of different net impact states2The change of map can analyze the interior of reservoir stress sensitive
In mechanism；And nuclear magnetic resonance technique can carry out stress sensitive experiment to same rock core and test with recovery ratio, avoid conventional point
Analyse the different non-single-factor variables of rock core heterogeneity bring.
Scheme explanation
The present invention can be further illustrated by the nonlimiting examples that figure provides；
Fig. 1 is nuclear-magnetism porosity calculation fitted figure of the invention；
Fig. 2 is the nuclear-magnetism T of rock core of the invention under different net impact states2Map；
Fig. 3 is nuclear-magnetism T of the rock core under different net impact states2The wave crest figure of map；
Fig. 4 is stress sensitive experimental curve diagram of the invention；
Fig. 5 is the curve graph of nuclear-magnetism permeability variation rate of the rock core under different net impact states；
Symbol description in figure is as follows:
A, the nuclear-magnetism T of rock core when net impact is 0Mpa2Map；
B, the nuclear-magnetism T of rock core when net impact is 2Mpa2Map；
C, the nuclear-magnetism T of rock core when net impact is 4Mpa2Map；
D, the nuclear-magnetism T of rock core when net impact is 6Mpa2Map；
E, the nuclear-magnetism T of rock core when net impact is 8Mpa2Map；
F, the nuclear-magnetism T of rock core when net impact is 10Mpa2Map；
G, the nuclear-magnetism T of rock core when net impact is 12Mpa2Map；
H, the nuclear-magnetism T of rock core when net impact is 14Mpa2Map；
I, the nuclear-magnetism T of rock core when net impact is 16Mpa2Map；
J, the nuclear-magnetism T of rock core when net impact is 18Mpa2Map.
Specific embodiment
In order to make those skilled in the art that the present invention may be better understood, below by embodiment to the technology of the present invention
Scheme further illustrates.
A method of tight sandstone reservoir stress sensitive is evaluated based on nuclear magnetic resonance technique, is included the following steps:
Step 1: the rock core of preparation experiment sandstone；
Preparation diameter is 2.5cm, and length is the rock core of the columned sandstone of 5cm, and rock core is placed on to 110 DEG C of baking oven
In 24 hours dry, then weigh rock core dry weight be 69.720g；Rock core is placed in closed container to vacuumize 48 small later
When, it adds water flooding and persistently vacuumizes until rock core is saturated；Then rock core is transferred in the container of 20MPa and is pressurizeed 24 hours
Take out spare, pressurization can allow water flooding to enter rock core whole hole as far as possible, be saturated rock core hole sufficiently, to improve
Testing precision.
Step 2: nuclear-magnetism porosity calculation model is established；
The nuclear-magnetism T of the titer of at least three groups Different porosities is tested respectively2Map, the present embodiment test standard used
Liquid is five groups, and the porosity of five groups of titers is respectively the volume of 6%, 10%, 15%, 20% and 25%, and five groups of titers
It is 10ml；Then the nuclear-magnetism T obtained according to test2Map calculates test unit signal amount used, further according to unit signal
Linear relationship establishes nuclear-magnetism porosity calculation model between amount and nuclear-magnetism porosity.
Unit signal amount is the resultant signal amount of test divided by the volume of titer, and resultant signal amount is bent according to nuclear-magnetism T2 map
The areal calculation that line is wrapped up, the porosity for obtaining titer and the relationship of unit signal amount are as shown in table 1:
Table 1
According to nuclear-magnetism porosity calculation fitted figure made of table 1 as shown in Figure 1, can obtain the meter of nuclear-magnetism porosity by Fig. 1
Calculate model are as follows:WhereinNuclear-magnetism porosity is represented, X is unit volume signals amount；R in Fig. 12Refer to line
Shape correlation, value is closer to 1, then it represents that linear correlation is better.
Step 3: the oil phase volume of rock core is calculated；
Weigh the weight M of rock core obtained in step 1WFor 76.358g, then rock core is saturated using crude oil, saturation
Detailed process are as follows: rock core is put into clamper, and applies confining pressure, uses displacement pump with the constant-velocity of 0.1ml/min later
Crude oil is injected into rock core, and the water flooding in rock core is discharged from the outlet end of rock core, when the anhydrous discharge in outlet end, rock core
Crude oil is saturated to complete；Then the weight M of the rock core after weighing saturation crude oil againwoFor the nuclear-magnetism T2 of 75.258g and testing rock core figure
Spectrum, according to test, unit signal amount used passes through formulaThe nuclear-magnetism porosity of rock core is calculated, later
The oil phase volume V under irreducible water saturation oil condition is calculated according to grease density variation0, calculation formula are as follows: V0=(MW-Mwo)/(ρw-
ρo), bringing data into and must being saturated oil volume Vo is 5.401ml.Wherein: ρoFor the density 0.8g/ml, ρ of crude oilwFor the density 1g/ of water
ml。
Step 4: setting experiment primary condition；
Rock core is put into clamper, and applies the back pressure of 20Mpa to rock core outlet end, starts from scratch alternately promoted later
The stream of rock core is pressed and confining pressure, and pressure difference during boosting between confining pressure and stream pressure is no more than 2MPa, until confining pressure reaches
22MPa, stream pressure stop boosting when reaching 20MPa, and after stablizing re-test rock core nuclear-magnetism T2Map；When confining pressure and flow pressure
Between pressure difference be no more than 2MPa when rock core suffered by net impact be zero, i.e., when confining pressure and stream pressure between difference be greater than 2Mpa
When, net impact suffered by rock core is that the difference between confining pressure and stream pressure subtracts 2MPa again.
The nuclear-magnetism T of testing rock core in this step2Map purpose is to obtain nuclear-magnetism T of the rock core under 0Mpa state2When relaxation
Between be distributed, convenient for after calculate nuclear-magnetism permeability.
Step 5: the nuclear-magnetism T of rock core under the conditions of different back pressure is tested2Map and out oil volume；
Gradually reduce rock core outlet end back pressure be 18Mpa, 16MPa, 14MPa, 12MPa, 10MPa, 8MPa, 6MPa,
4MPa, 2MPa, and under the conditions of each back pressure testing rock core nuclear-magnetism T2Map and out oil volume, the process of the test are as follows:
Crude oil whole displacement is first gone out into rock core using water flooding under the displacement pressure difference of 2MPa, and records out oil volume, after displacement
The nuclear-magnetism T of testing rock core when in rock core without displacement pressure difference2Map；The displacement pressure difference is the difference between stream pressure and back pressure.
When in rock core without displacement pressure difference, stream presses, that is, the nuclear-magnetism T that measures equal with back pressure2Map be respectively rock core 2Mpa,
Nuclear-magnetism T under the net impact state of 4MPa, 6MPa, 8MPa, 10MPa, 12MPa, 14MPa, 16MPa and 18MPa2Map, it is different
Nuclear-magnetism T under net impact state2Map is as shown in Figure 2.As seen from Figure 2 in the case where low stress is sensitive, macroporous decrement
Greater than fine pore decrement, illustrate under low stress, macroporous deformation is the principal element that nuclear-magnetism permeability weakens, with stress
The compression growth rate of sensitivity enhancing, fine pore is accelerated, and macroporous compression growth rate reduces, therefore under condition of high ground stress, it is small
The deformation of hole is that nuclear-magnetism permeability reduces the influence factor that can not ignore.
Step 6: the recovery ratio and nuclear-magnetism permeability of rock core are calculated；
The recovery ratio of rock core uses the ratio calculation gone out between oil volume and oil phase volume Vo after displacement；The nuclear-magnetism of rock core
Permeability is calculated using the SDR model of nuclear magnetic resonance core analysis and well logging field, the expression formula of the model are as follows: KNMR=30 φ4T2g 2, in which: KNMRFor nuclear-magnetism permeability, T2The geometrical mean in g relaxation time, andφ is nuclear-magnetism hole
Porosity；The case where recovery ratio and nuclear-magnetism permeability of the obtained rock core under different net impacts, is as shown in table 2:
Table 2
Step 7: the change rate of the nuclear-magnetism permeability of rock core under different net impacts is calculated；
According to formulaCalculate the change rate of the nuclear-magnetism permeability of rock core under different net impacts, in which: D
Represent the change rate of rock core nuclear-magnetism permeability, Ko represents the nuclear-magnetism permeability when net impact is 0Mpa of rock core, and Ki represents rock
Nuclear-magnetism permeability of the heart under different net impacts.
Using net impact as abscissa, the ratio of nuclear-magnetism permeability and the nuclear-magnetism permeability under no net impact under different net impacts
Value is ordinate, draws stress sensitive experimental curve diagram as shown in figure 3, stress sensitive empirical curve can be stress sensitive test mark
Standard provides to obtain basic pattern, reflects that permeability obtains situation of change with net impact.Rock is calculated separately out according to the formula in step 7
Nuclear-magnetism of the heart under the net impact state of 2Mpa, 4MPa, 6MPa, 8MPa, 10MPa, 12MPa, 14Mpa, 16MPa and 18Mpa seeps
The change rate of saturating rate, and draw out curve graph such as Fig. 4 institute of nuclear-magnetism permeability variation rate of the rock core under different net impact states
Show, it is known that the maximum spoilage of the nuclear-magnetism permeability of rock core is 60.99%, which is the maximum of nuclear-magnetism permeability
Change rate compares stress sensitive damage appraisement index as shown in table 3 it is found that reservoir core damaged condition is medium partially strong.
| Stress sensitive loss ratio (%) | Damaged condition |
| Dmax≤5 | Nothing |
| 5 Dmax≤30 < | It is weak |
| 30 Dmax≤50 < | It is medium on the weak side |
| 50 Dmax≤70 < | It is medium partially strong |
| Dmax > 70 | By force |
Table 3
Above to a kind of method based on nuclear magnetic resonance technique evaluation tight sandstone reservoir stress sensitive provided by the invention
It is described in detail.The explanation of specific embodiment is merely used to help understand method and its core concept of the invention.It should
It points out, it for those skilled in the art, without departing from the principle of the present invention, can also be to this hair
Bright some improvement and modification can also be carried out, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.
Claims (7)
1. a kind of method based on nuclear magnetic resonance technique evaluation tight sandstone reservoir stress sensitive, it is characterised in that: including as follows
Step:
Step 1: the rock core of preparation experiment sandstone；
The rock core of columned sandstone is dried, then weighs the dry weight of rock core；Rock core is placed in closed container later and is taken out very
It is 48 hours empty, it adds water flooding and persistently vacuumizes until rock core is saturated；
Step 2: nuclear-magnetism porosity calculation model is established；
The nuclear-magnetism T2 map of the titer of at least three groups Different porosities is tested respectively, and is calculated according to the nuclear-magnetism T2 map measured
Test unit signal amount used, then establishes nuclear-magnetism hole according to the linear relationship between unit signal amount and nuclear-magnetism porosity
Spend computation model；
Step 3: the oil phase volume V of rock core is calculated0；
Weigh the weight M of rock core obtained in step 1W, then rock core is saturated using crude oil, then weigh the rock after saturation crude oil
The weight M of the heartwoAnd nuclear-magnetism T2 map is tested, oil phase volume V is calculated later0, calculation formula are as follows: V0=(MW-Mwo)/(ρw-ρo),
Wherein: ρwFor the density of water, ρoFor the density of crude oil；
Step 4: setting experiment primary condition；
Rock core is put into clamper, and applies the back pressure of 20MPa to rock core outlet end, alternately promotes rock since 0MPa later
The stream of the heart is pressed and confining pressure, and pressure difference during boosting between confining pressure and stream pressure is no more than 2MPa, until stream pressure rises to
Stop boosting, the nuclear-magnetism T2 map of re-test rock core when 20MPa；
Step 5: the nuclear-magnetism T2 map of rock core and out oil volume are tested under the conditions of different back pressure；
The gradually equivalent back pressure for reducing rock core outlet end, and the nuclear-magnetism T2 map of testing rock core and go out under the conditions of each back pressure
Oil volume, the process of the test are as follows: using water flooding with the displacement pressure difference displacement rock core of 2Mpa to outlet section it is not fuel-displaced after, record
Oil volume out turns off displacement pump, the nuclear-magnetism T2 map of testing rock core when in rock core without displacement pressure difference；The displacement pressure difference is
Difference between the inlet pressure and back pressure of rock core；
Step 6: the recovery ratio and nuclear-magnetism permeability of rock core are calculated；
The recovery ratio of rock core uses the ratio calculation gone out between oil volume and oil phase volume Vo after displacement；The nuclear-magnetism of rock core permeates
Rate is calculated using the SDR model of nuclear magnetic resonance core analysis and well logging field, the expression formula of the model are as follows: KNMR=30 φ4T2g 2,
Wherein: KNMRFor nuclear-magnetism permeability, T2The geometrical mean in g relaxation time, andφ is nuclear-magnetism porosity.
Step 7: the change rate of the nuclear-magnetism permeability of rock core under different net impacts is calculated；
Calculation formula are as follows:Wherein: D represents the change rate of rock core nuclear-magnetism permeability, and Ko represents rock core net
Nuclear-magnetism permeability when stress is 0Mpa, Ki represent nuclear-magnetism permeability of the rock core under different net impacts.
2. a kind of method based on nuclear magnetic resonance technique evaluation tight sandstone reservoir stress sensitive according to claim 1,
It is characterized by: the diameter of the rock core is 2.5cm, length 5cm.
3. a kind of method based on nuclear magnetic resonance technique evaluation tight sandstone reservoir stress sensitive according to claim 1,
It is characterized by: the method for drying rock core in the step 1 are as follows: it is small that rock core is placed on to baking 24 in 110 DEG C of baking oven
When.
4. a kind of method based on nuclear magnetic resonance technique evaluation tight sandstone reservoir stress sensitive according to claim 1,
It is characterized by: after rock core is saturated water flooding, rock core is pressurizeed 24 hours under conditions of 20Mpa in the step 1.
5. a kind of method based on nuclear magnetic resonance technique evaluation tight sandstone reservoir stress sensitive according to claim 1,
It is characterized by: titer used in the step 2 has five groups, and the porosity of five groups of titers is respectively 6%, 10%,
15%, 20% and 25%.
6. a kind of method based on nuclear magnetic resonance technique evaluation tight sandstone reservoir stress sensitive according to claim 1,
It is characterized by: the mode for being saturated rock core using crude oil in the step 3 are as follows: rock core obtained in step 1 is put into folder
In holder, and apply confining pressure, crude oil is injected into rock core using displacement pump constant speed later, makes water flooding in rock core from rock core
Outlet end discharge, when the anhydrous discharge in outlet end, rock core is saturated crude oil and completes.
7. a kind of method based on nuclear magnetic resonance technique evaluation tight sandstone reservoir stress sensitive according to claim 1,
It is characterized by: the value that the back pressure of rock core outlet end gradually reduces is 2Mpa in the step 5.
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| CN111678853B (en) * | 2020-06-19 | 2021-09-14 | 中国科学院武汉岩土力学研究所 | Method for measuring saturated permeability coefficient of high-compaction expansive soil |
| CN112362475A (en) * | 2020-11-09 | 2021-02-12 | 重庆科技学院 | Evaluation method for trapped sealing ultimate pressure of oil reservoir type gas storage |
| CN112505085A (en) * | 2021-02-05 | 2021-03-16 | 西南石油大学 | Method for measuring porosity effective stress coefficient based on nuclear magnetic resonance |
| CN112505085B (en) * | 2021-02-05 | 2021-04-09 | 西南石油大学 | Method for measuring porosity effective stress coefficient based on nuclear magnetic resonance |
| CN116539815A (en) * | 2023-06-07 | 2023-08-04 | 四川省科源工程技术测试中心有限责任公司 | Device and method suitable for evaluating and optimizing working fluid of oil and gas reservoir |
| CN116539815B (en) * | 2023-06-07 | 2024-03-19 | 四川省科源工程技术测试中心有限责任公司 | Device and method suitable for evaluating and optimizing working fluid of oil and gas reservoir |
| CN116539655A (en) * | 2023-07-06 | 2023-08-04 | 山东石油化工学院 | Method for evaluating water sensitivity of tight sandstone reservoir based on nuclear magnetic resonance technology |
| CN116539655B (en) * | 2023-07-06 | 2023-10-10 | 山东石油化工学院 | Method for evaluating water sensitivity of tight sandstone reservoir based on nuclear magnetic resonance technology |
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