CN106290118A - Oil in Super-low Permeability rock permeability measuring method under triaxial stress effect - Google Patents

Oil in Super-low Permeability rock permeability measuring method under triaxial stress effect Download PDF

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Publication number
CN106290118A
CN106290118A CN201610944473.6A CN201610944473A CN106290118A CN 106290118 A CN106290118 A CN 106290118A CN 201610944473 A CN201610944473 A CN 201610944473A CN 106290118 A CN106290118 A CN 106290118A
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China
Prior art keywords
sample
pressure
permeability
super
oil
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CN201610944473.6A
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Chinese (zh)
Inventor
胡大伟
王冲
魏天宇
周辉
张传庆
杨凡杰
卢景景
朱勇
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中国科学院武汉岩土力学研究所
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Priority to CN201610944473.6A priority Critical patent/CN106290118A/en
Publication of CN106290118A publication Critical patent/CN106290118A/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/08Investigating permeability, pore-volume, or surface area of porous materials
    • G01N15/082Investigating permeability by forcing a fluid through a sample
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/08Investigating permeability, pore-volume, or surface area of porous materials
    • G01N15/082Investigating permeability by forcing a fluid through a sample
    • G01N15/0826Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change

Abstract

The invention discloses Oil in Super-low Permeability rock permeability measuring method under a kind of triaxial stress effect.It comprises the steps: to choose Oil in Super-low Permeability rock, prepares sample;With rubber sleeve, the permeable backing plate at upper and lower for sample two ends, sample are wrapped between upstream hole pressure pad block and confined pressure room base;Apply confined pressure and axial compression to particular value to sample, apply osmotic pressure to sample so that sample is saturated simultaneously;After the pressurization of sample osmotic pressure is saturated, apply amplitude, the known sine pressure wave of frequency to sample, record downstream pore pressure ripple situation and by real-time data transmission to DATA REASONING and acquisition system simultaneously;Change confined pressure, axial compression size, waveform cross-correlation method is used for the measurement of permeability, the sample in the case of different confined pressure, axial compressions is carried out permeability analysis, draw the permeability under the conditions of different confined pressure, axial compression.Overcome that prior art certainty of measurement is poor, be only provided that confined pressure, the shortcoming that cannot truly simulate deep rock mass stress under triaxial stress effect.

Description

Oil in Super-low Permeability rock permeability measuring method under triaxial stress effect

Technical field

The present invention relates under the rock mechanics field tests in Geotechnical Engineering, more specifically triaxial stress effect Oil in Super-low Permeability rock permeability measuring method.

Background technology

Permeability is one of important physical parameter of rock, for understanding unconventionaloil pool field and the deep of nuclear waste storage The physical characteristic of rock mass is even more important;And along with the exploitation of shale gas in recent years, tight sand oil gas etc., need one urgently Planting and measure the device of Oil in Super-low Permeability rock mass permeability under triaxial state of stress, experimental principle now and experimental apparatus are proposed by this No small challenge.

The experimental apparatus of the rock permeability of great majority measurement at present all uses the principle such as steady state method or pressure pulse method, right Oil in Super-low Permeability rock mass in the reservoir of unconventionaloil pool field, there is measuring principle backwardness, poor the lacking of certainty of measurement in this kind of method of testing Point, therefore and the measurement of inapplicable this Oil in Super-low Permeability rock mass permeability;Measure Oil in Super-low Permeability rock permeability at present popular Method is pressure oscillations method, and the principle of the method is by applying known osmotic pressure Reeb in rock sample upstream, surveying in downstream Measure corresponding osmotic pressure Reeb, draw Oil in Super-low Permeability rock permeability by contrast waveform between the two.

The instrument of current domestic a small amount of employing pressure oscillations method measurement Oil in Super-low Permeability rock mass permeability then also exists certain lacking Point;Patent " a kind of cross-correlation skill measuring Oil in Super-low Permeability rock permeability stress sensitivity of Application No. 201310518094.7 Art " in have employed pressure oscillations method and measure the permeability of Oil in Super-low Permeability rock, but this device is only provided that confined pressure, it is impossible to provide three The trystate of axial stress, it is impossible to true simulation deep rock mass stress under triaxial stress effect.

Summary of the invention

The invention aims to provide Oil in Super-low Permeability rock permeability measuring method under triaxial stress effect.

To achieve these goals, the technical scheme is that under triaxial stress effect, Oil in Super-low Permeability rock permeability is surveyed Metering method, it is characterised in that: comprise the steps:

Step 1: choose Oil in Super-low Permeability rock, and it is processed into the cylinder experimental member of standard, obtain sample;

Step 2: the permeable backing plate at upper and lower for sample two ends, sample are wrapped in upstream hole pressure pad block and confined pressure with rubber sleeve Between the base of room, and with two upper and lower two ends of clip banding rubber sleeve;

Step 3: apply confined pressure and axial compression to sample by confined pressure closed loop servo dosing pump, axial compression closed loop servo dosing pump To particular value, apply osmotic pressure by osmotic pressure closed loop servo dosing pump to sample so that sample is saturated simultaneously;

Step 4: until sample osmotic pressure pressurization saturated after, by osmotic pressure closed loop servo dosing pump to sample apply amplitude, The known sine pressure wave of frequency, simultaneously by the situation of hole pressure sensor record downstream, downstream pore pressure ripple and by data reality Time be transferred to DATA REASONING and acquisition system;

Step 5: change confined pressure, axial compression size, waveform cross-correlation method is used for the measurement of permeability, to different confined pressures, Sample in the case of axial compression carries out permeability analysis, draws the permeability under the conditions of different confined pressure, axial compression:

Computing permeability mode such as formula is 1. shown:

Wherein, η is the osmotic pressure medium coefficient of viscosity, and L is piece lengths, and β is osmotic pressure media collapse coefficient, and T is hole In the pressure oscillations cycle, S is test specimen cross-sectional area, and V is upstream hole pressure vessel volume, and ψ, γ are to produce in formulation process Two dimensionless numbers,

ψ and γ is tried to achieve by upstream and downstream Amplitude Ration α, the Phase delay θ measuring gained;Wherein, ψ, γ calculation is as public Formula is 2. shown:

Wherein, α be upstream and downstream Amplitude Ration, θ be Phase delay,

According to Fischer research conclusion, upstream and downstream Amplitude Ration α, Phase delay θ can be expressed as the function of ψ, γ, for making Functional form is simple, and the functional expression containing ψ, γ is expressed as A, X by spyD、YD、A、XD、YDIt it is a process variable.

In technique scheme, in described step 1, the described Oil in Super-low Permeability rock chosen includes shale, tight sand, Described sample is the described cylinder experimental member being processed to diameter 5mm, long 10mm.Shale or described tight sand are wanted really Protect internal soundness, must not have relatively macrolesion.

In technique scheme, described permeable backing plate include permeable backing plate, under permeable backing plate, described permeable backing plate Be arranged at described sample upper end, described under permeable backing plate be arranged at described sample lower end;State in rapid 3 described, it is ensured that described examination Sample is the most saturated, and the saturated of described sample can use hold-up or gas saturated.Ensure the sealing of test cabinet;Make confined pressure room Strictly isolate with laboratory, prevent during applying osmotic pressure not in place on measurement result generation impact owing to sealing;Prevent Saturated insufficient produce subsequent experimental affects.

In technique scheme, in described step 5, when data record and process, utilize signal processing technology In cross-correlation function analyze method improve signal to noise ratio.Due to the interference of experimental apparatus itself, temperature and other signals of telecommunication, meeting The Pore Pressure sine pressure wave measured is produced interference;For the measurement of Oil in Super-low Permeability rock permeability, this interference is to a certain degree On have impact on the accuracy of experimental result, analyze method (as used fast Fourier (FFT) to become hence with cross-correlation function Change) improve signal to noise ratio, thus improve experimental precision.

In technique scheme, the instrument internal pipe diameter of transport pore media is less than 1mm, and outside transport pipeline The most a diameter of more than or equal to 2mm.

Owing to, in the experiments of measuring of Oil in Super-low Permeability rock permeability, than storage flow rate, (ratio storage flow rate is per unit volume seepage flow System stores the ability of fluid) experimental result is affected the measurement result impact of the general rock permeability of comparison greatly, therefore want fully Consider than the storage flow rate impact on experimental result;To this end, the instrument internal pipe diameter of transport pore media must be sufficiently small, and Then corresponding diameter can be slightly larger for outside transport pipeline.

Present invention have the advantage that

(1) Oil in Super-low Permeability rock permeability can be measured well;

(2) it is provided that the trystate of triaxial stress, the triaxial state of stress of rock mass can have been simulated truly;

(3) test cabinet build-in test sample is tightly wrapped up by rubber sleeve, and wherein one piece of permeable backing plate is respectively placed in sample top and the bottom, Permeable backing plate is identical with sample size, and sample and two pieces of permeable backing plates are closely seated in by rubber sleeve by two clips Between hole pressure head and confined pressure room base;Ensure the sealing of test cabinet;Make confined pressure room strictly isolate with laboratory, prevent from executing Owing to sealing is not in place, measurement result is produced impact during adding osmotic pressure;

(4) realize computer to the monitoring in real time of data overall process and to control, coordinate related software automatically to calculate experiment knot Really, time saving and energy saving, it is to avoid personal error;Using signal processing technology to process data, certainty of measurement is high;

(5) simple to operate, principle is advanced and mature.

Accompanying drawing explanation

Fig. 1 is experimental provision structural representation of the present invention.

Fig. 2 is that the present invention implements to measure the relevant figure of Oil in Super-low Permeability rock permeability Pore Pressure waveform under triaxial state of stress.

2-confined pressure room base in figure, 7-upstream hole pressure pad block, the permeable backing plate of 8-, the upper permeable backing plate of 81-, permeable under 82- Backing plate, 9-sample, 10-clip, 11-rubber sleeve, 14-confined pressure closed loop servo dosing pump, 17-axial compression closed loop servo dosing pump, 20- Osmotic pressure closed loop servo dosing pump, 22-downstream hole pressure sensor, 23-data acquisition and processing system, I-upper pore pressure Ripple, II-lower hole pressure wave.

Detailed description of the invention

Describe the performance of the present invention below in conjunction with the accompanying drawings in detail, but they are not intended that limitation of the invention, only For example.Make advantages of the present invention more clear and easy to understand by explanation simultaneously.

Refering to accompanying drawing understand: Oil in Super-low Permeability rock permeability measuring method under triaxial stress effect, it is characterised in that: include as Lower step:

Step 1: choose Oil in Super-low Permeability rock, and it is processed into the cylinder experimental member of standard, obtain sample 9;

Step 2: the permeable backing plate 8 at sample about 9 two ends, sample 9 are wrapped in upstream hole pressure pad block 7 with rubber sleeve 11 And between confined pressure room base 2, and with two clip 10 banding rubber sleeve about 11 two ends;

Step 3: by confined pressure closed loop servo dosing pump 14, axial compression closed loop servo dosing pump 17 give sample 9 apply confined pressure with And axial compression is to particular value, apply osmotic pressure to sample 9 by osmotic pressure closed loop servo dosing pump 20 so that sample 9 is saturated simultaneously;

Step 4: after the pressurization of sample 9 osmotic pressure is saturated, to sample 9 to apply to shake by osmotic pressure closed loop servo dosing pump 20 The known sine pressure wave of width, frequency, records the situation of downstream pore pressure ripple II also by downstream hole pressure sensor 22 simultaneously By real-time data transmission to DATA REASONING and acquisition system 23;

Step 5: change confined pressure, axial compression size, waveform cross-correlation method is used for the measurement of permeability, to different confined pressures, Sample 9 in the case of axial compression carries out permeability analysis, draws the permeability under the conditions of different confined pressure, axial compression;

Computing permeability mode such as formula is 1. shown:

Wherein, η is the osmotic pressure medium coefficient of viscosity, and L is piece lengths, and β is osmotic pressure media collapse coefficient, and T is hole In the pressure oscillations cycle, S is test specimen cross-sectional area, and V is upstream hole pressure vessel volume, and ψ, γ are to produce in formulation process Two dimensionless numbers,

ψ and γ is tried to achieve by upstream and downstream Amplitude Ration α, the Phase delay θ measuring gained;Wherein, ψ, γ calculation is as public Formula is 2. shown:

Wherein, α be upstream and downstream Amplitude Ration, θ be Phase delay,

According to Fischer research conclusion, upstream and downstream Amplitude Ration α, Phase delay θ can be expressed as the function of ψ, γ, for making Functional form is simple, and the functional expression containing ψ, γ is expressed as A, X by spyD、YD、A、XD、YDIt it is a process variable.

In described step 1, the described Oil in Super-low Permeability rock chosen includes shale, tight sand;Described sample 9 is processed Become diameter 5mm, the described cylinder experimental member of long 10mm.

Described permeable backing plate 8 include permeable backing plate 81, under permeable backing plate 82, described permeable backing plate 81 is arranged at described Sample 9 upper end, described under permeable backing plate 82 be arranged at described sample 9 lower end;State in rapid 3 described, it is ensured that described sample 9 is abundant Saturated, the saturated of described sample 9 can use hold-up or gas saturated.

In described step 5, when data record and process, utilize the cross-correlation function analysis in signal processing technology Method improves signal to noise ratio.

The instrument internal pipe diameter of transport pore media less than 1mm, and the outside corresponding diameter of transport pipeline more than or Equal to 2mm.

In Fig. 2, I is upper Pore Pressure Reeb, osmotic pressure servopump apply amplitude and frequency by percolation path to rock sample Known to rate, sinusoidal osmotic pressure Reeb, its amplitude and frequency controls by the servo control molding of servopump in triaxial pressure system 24 Block is controlled, and the measurement of its amplitude and frequency is recorded by upper osmolarity sensor 19, ultimately form the osmotic pressure of osmotic pressure- Temporal image;Due to the impact of rock sample permeability, sine osmotic pressure Reeb, upstream is when by rock sample inside, and it shakes Width can be decayed, and phase place also can occur hysteresis effect, namely the downstream hole pressure wave II in figure;Same, lower hole The measurement of pressure is recorded by lower osmolarity sensor 22, ultimately forms the osmotic pressure-temporal image of lower osmotic pressure;Thus can be straight The Amplitude Ration α and Phase delay θ that obtain upper and lower Pore Pressure amplitude seen, by the width of permeability Yu upper and lower Pore Pressure amplitude Value ratio α and the relation of Phase delay θ, finally calculate the permeability of rock sample.

Other unaccounted part belongs to prior art.

Claims (5)

1. Oil in Super-low Permeability rock permeability measuring method under triaxial stress effect, it is characterised in that: comprise the steps:
Step 1: choose Oil in Super-low Permeability rock, and it is processed into the cylinder experimental member of standard, obtain sample (9);
Step 2: sample (9) the permeable backing plate (8) at two ends, sample (9) up and down are wrapped in upstream Pore Pressure with rubber sleeve (11) Between cushion block (7) and confined pressure room base (2), and with two clips (10) banding rubber sleeve (11) up and down two ends;
Step 3: apply confined pressure to sample (9) by confined pressure closed loop servo dosing pump (14), axial compression closed loop servo dosing pump (17) And axial compression is to particular value, apply osmotic pressure to sample (9) by osmotic pressure closed loop servo dosing pump (20) so that sample simultaneously (9) saturated;
Step 4: after the pressurization of sample (9) osmotic pressure is saturated, applies to sample (9) by osmotic pressure closed loop servo dosing pump (20) The known sine pressure wave of amplitude, frequency, simultaneously by downstream hole pressure sensor (22) record downstream pore pressure ripple (II) Situation by real-time data transmission to DATA REASONING and acquisition system (23);
Step 5: change confined pressure, axial compression size, waveform cross-correlation method is used for the measurement of permeability, to different confined pressure, axial compressions In the case of sample (9) carry out permeability analysis, draw the permeability under the conditions of different confined pressure, axial compression;
Computing permeability mode such as formula is 1. shown:
Wherein, η is the osmotic pressure medium coefficient of viscosity, and L is piece lengths, and β is osmotic pressure media collapse coefficient, and T is pore pressure In the concussion cycle, S is test specimen cross-sectional area, and V is upstream hole pressure vessel volume, and ψ, γ are two produced in formulation process Dimensionless number,
ψ and γ is tried to achieve by upstream and downstream Amplitude Ration α, the Phase delay θ measuring gained;Wherein, ψ, γ calculation such as formula is 2. Shown in:
Wherein, α be upstream and downstream Amplitude Ration, θ be Phase delay,
According to Fischer research conclusion, upstream and downstream Amplitude Ration α, Phase delay θ can be expressed as the function of ψ, γ, for making function Form is simple, and the functional expression containing ψ, γ is expressed as A, X by spyD、YD、A、XD、YDIt it is a process variable.
Oil in Super-low Permeability rock permeability measuring method under triaxial stress effect the most according to claim 1, it is characterised in that: In described step 1, the described Oil in Super-low Permeability rock chosen includes shale, tight sand;Described sample (9) is for being processed to diameter 5mm, the described cylinder experimental member of long 10mm.
Oil in Super-low Permeability rock permeability measuring method under triaxial stress effect the most according to claim 1 and 2, its feature exists In: described permeable backing plate (8) include upper permeable backing plate (81), under permeable backing plate (82), described permeable backing plate (81) is arranged at Described sample (9) upper end, described under permeable backing plate (82) be arranged at described sample (9) lower end;State in rapid 3 described, it is ensured that institute Stating sample (9) the most saturated, the saturated of described sample (9) can use hold-up or gas saturated.
Oil in Super-low Permeability rock permeability measuring method under triaxial stress effect the most according to claim 3, it is characterised in that: In described step 5, when data record and process, utilize the cross-correlation function in signal processing technology to analyze method and improve letter Make an uproar ratio.
Oil in Super-low Permeability rock permeability measuring method under triaxial stress effect the most according to claim 4, it is characterised in that: fortune The instrument internal pipe diameter of defeated pore media is less than 1mm, and the outside corresponding diameter of transport pipeline is more than or equal to 2mm.
CN201610944473.6A 2016-10-26 2016-10-26 Oil in Super-low Permeability rock permeability measuring method under triaxial stress effect CN106290118A (en)

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CN106769472A (en) * 2017-01-11 2017-05-31 三峡大学 Based on the vertical mechanical load Experiment on Function device of concrete and test method under axial dispersion and the effect of lateral confined pressure
CN107014730A (en) * 2017-03-15 2017-08-04 中国矿业大学 A kind of method for simulating true groundwater erosion Nuclear Waste Repository padded coaming
CN107300507A (en) * 2017-07-20 2017-10-27 山东科技大学 Three axle Seepage Experiment boxes and application method that can be axially loaded and dual-purpose axial no-load
CN108663300A (en) * 2018-05-07 2018-10-16 西安石油大学 Hyposmosis tight sand experimental provision
CN109239310A (en) * 2018-09-06 2019-01-18 西安石油大学 A kind of seepage force size and its measuring device and method that stratum effective stress is influenced
CN109253962A (en) * 2018-10-30 2019-01-22 山东大学 Rock three-axis force Penetration Signature tester and test method
CN109490119A (en) * 2018-12-13 2019-03-19 中国科学院武汉岩土力学研究所 A kind of determination method of rock material damage variable
CN109580454A (en) * 2019-01-05 2019-04-05 中国海洋石油集团有限公司 A method of compact reservoir Fluid Sensitivity is tested with pressure oscillation method

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106769472A (en) * 2017-01-11 2017-05-31 三峡大学 Based on the vertical mechanical load Experiment on Function device of concrete and test method under axial dispersion and the effect of lateral confined pressure
CN106769472B (en) * 2017-01-11 2019-09-24 三峡大学 Based on the vertical mechanical load Experiment on Function device of concrete and test method under axial dispersion and the effect of lateral confining pressure
CN107014730A (en) * 2017-03-15 2017-08-04 中国矿业大学 A kind of method for simulating true groundwater erosion Nuclear Waste Repository padded coaming
CN107014730B (en) * 2017-03-15 2019-01-25 中国矿业大学 A method of simulating true groundwater erosion Nuclear Waste Repository padded coaming
CN107300507A (en) * 2017-07-20 2017-10-27 山东科技大学 Three axle Seepage Experiment boxes and application method that can be axially loaded and dual-purpose axial no-load
CN107300507B (en) * 2017-07-20 2020-05-05 山东科技大学 Axial-loading and axial-unloading dual-purpose triaxial seepage experiment box and using method
CN108663300A (en) * 2018-05-07 2018-10-16 西安石油大学 Hyposmosis tight sand experimental provision
CN109239310A (en) * 2018-09-06 2019-01-18 西安石油大学 A kind of seepage force size and its measuring device and method that stratum effective stress is influenced
CN109253962A (en) * 2018-10-30 2019-01-22 山东大学 Rock three-axis force Penetration Signature tester and test method
CN109490119A (en) * 2018-12-13 2019-03-19 中国科学院武汉岩土力学研究所 A kind of determination method of rock material damage variable
CN109580454A (en) * 2019-01-05 2019-04-05 中国海洋石油集团有限公司 A method of compact reservoir Fluid Sensitivity is tested with pressure oscillation method

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