CN106841000A - The sample component and its test method of special hypotonic rock radial penetration rate testing experiment - Google Patents

The sample component and its test method of special hypotonic rock radial penetration rate testing experiment Download PDF

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Publication number
CN106841000A
CN106841000A CN201710023302.4A CN201710023302A CN106841000A CN 106841000 A CN106841000 A CN 106841000A CN 201710023302 A CN201710023302 A CN 201710023302A CN 106841000 A CN106841000 A CN 106841000A
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sample
rock
crossover sub
penetration rate
radial penetration
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CN201710023302.4A
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Chinese (zh)
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CN106841000B (en
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何柏
谢凌志
赵鹏
孙亚泽
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四川大学
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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

Abstract

A kind of sample component for the test of special hypotonic rock radial penetration rate that the present invention is provided, including upper crossover sub and lower crossover sub that cylindrical rock sample, agent structure are cylinder, the rock sample center processes the cylindrical hole that promising permeating medium provides radial penetration passage, and the cylindrical boss coordinated with the insertion of rock sample cylindrical hole is designed with the upper crossover sub bottom center;The cylindrical bulge loop coordinated with the insertion of rock sample cylindrical hole is designed with the end face center of the lower crossover sub, is designed with bottom center and mounting hole is engaged with push-down head, center is machined with the permeating medium opening from mounting hole insertion top surface cylinder bulge loop.Present invention also offers the special hypotonic rock radial penetration rate testing experiment method based on said sample component.The present invention simple and effective can obtain the indoor permeability of special hypotonic rock, especially radially permeability.

Description

The sample component and its test method of special hypotonic rock radial penetration rate testing experiment

Technical field

The invention belongs to material properties of rock testing field, more particularly to rock permeability testing experiment method.

Background technology

Permeability is the important characterization parameter for describing fluid fluid ability in the porous media materials such as rock, and it is in the energy Exploitation has a wide range of applications with the various fields such as storage, waste treatment, hydraulic engineering, environmental project.Interior infiltration at present Rate method of testing is (such as:Steady state method, Transient Method, pore pressure succusion etc.) it is general using cylindrical, massive sample, permeating medium Other end is infiltrated into from one end face of sample, using the axial dispersion rate for being calculated rock of formula (1).

L is the height (m) of cylindrical sample in formula, and A is sample cross area (m2)。

In the last few years, with expanding economy, unconventional petroleum resources exploitation, CO2Geological storage, rock salt energy reserves etc. Engineering activity is further frequent.But this kind of engineering activity is faced with a common issue, i.e. the permeability of rock is extremely low.Due to The ability that this kind of special hypotonic rock allows fluid from itself is very weak, will meet when testing permeability using conventional experimental technique Face the problems such as experiment measurement process time span is larger, time-consuming, and due to flow system flow very little, the requirement to sensor is very It is high, it tends to be difficult to realize accurate measurement and control.It is past when therefore, using the Penetration Signature of the conventional special hypotonic rock of method test Larger error and difficulty is brought to experiment toward meeting, or even permeability of rock cannot be measured.If by shorten specimen height, Increase the means such as sample cross area to improve penetration testing efficiency, now sample will become platy structure, so as to be difficult to Coupled with stress level, and practice have shown that this kind of method is not notable to improving core penetration testing efficiency.On the other hand, engineering Many infiltration problems are three-dimensional diffusion flow process in practical activity, and the permeability for only investigating core axial direction is difficult to Its penetration signature is described.Therefore, the Penetration Signature of special hypotonic rock core how is more efficiently obtained, especially radially Penetration signature, the percolation law for the special hypotonic rock of research comprehensively is significant.

The content of the invention

In view of the shortcomings of the prior art, first goal of the invention of the invention is to provide one kind is used for special hypotonic rock radially The sample component of permeability test, the indoor permeability for special hypotonic rock is tested, especially radially permeability test;This Second purpose of invention is to provide the test method based on the above-mentioned sample component for the test of special hypotonic rock radial penetration rate, To obtain special hypotonic rock radial penetration feature.

For first goal of the invention of the invention, one kind that the present invention is provided is used for special hypotonic rock radial penetration rate and surveys The sample component of examination, including the upper crossover sub and lower crossover sub that cylindrical rock sample, agent structure are cylinder, it is described Rock sample center processes the cylindrical hole that promising permeating medium provides radial penetration passage, at the upper crossover sub bottom center It is designed with the cylindrical boss coordinated with the insertion of rock sample cylindrical hole;Be designed with the end face center of the lower crossover sub with The cylindrical bulge loop that the insertion of rock sample cylindrical hole coordinates, is designed with bottom center and mounting hole, center is engaged with push-down head It is machined with the permeating medium opening from mounting hole insertion top surface cylinder bulge loop.

The above-mentioned sample component for the test of special hypotonic rock radial penetration rate, upper crossover sub is straight with lower crossover sub Footpath and the equal diameters of rock sample.

The above-mentioned sample component for the test of special hypotonic rock radial penetration rate, the external diameter of the rock sample is not less than 50mm, preferably 50~100mm, internal diameter are preferably 5~10mm.Highly preferred 2~2.5 times for its external diameter of rock sample.

The above-mentioned sample component for the test of special hypotonic rock radial penetration rate, the body cylindrical of the upper crossover sub Highly it is not less than 10mm, preferably 10~20mm, the boss height on bottom surface is not less than 5mm, preferably 5~10mm, diameter is small In the cylindrical hole of rock sample center.

The above-mentioned sample component for the test of special hypotonic rock radial penetration rate, the body cylindrical of the lower crossover sub Highly be not less than 50mm, preferably 50~70mm, install hole depth be not less than 20mm, preferably 20~40mm, mounting hole it is straight Footpath is preferably 20~40mm.Bulge loop on lower crossover sub top surface is highly preferably not less than 5mm, and preferably 5~10mm, external diameter is small In rock sample center cylindrical hole.

For second goal of the invention of the invention, the present invention is provided based on above-mentioned for special hypotonic rock radial penetration rate The test method of the sample component of test, comprises the following steps:

(1) special hypotonic rock sample is carried out permeating preceding pretreatment work, if permeating medium is liquid, liquid is carried out to sample Body saturation is pre-processed;If permeating medium is gas, pretreatment need to be dried to sample;

(2) boss on upper crossover sub bottom surface, the bulge loop on lower crossover sub top surface are respectively embedded into rock sample In center cylindrical hole, and end face is docked with upper crossover sub and lower crossover sub smear bonding agent in rock sample and be allowed to mutually viscous Connect and be fixed as one, revealed from sample end face with permeating medium in preventing experimentation, then by rock sample, upper crossover sub Integrally sealed with sealing sample bag together with lower crossover sub, prevent moisture in air from being waved into moisture in sample and sample Hair;

(3) seaming chuck is docked with upper crossover sub top surface, and interface is that the medium for penetrating can be made to revert in seaming chuck In heart hole, first crossover sub and part seaming chuck in whole rock samples, whole, reusable heat contracting film are wrapped with infiltration silk screen afterwards Infiltration silk screen and the joining place up and down wrapped beyond infiltration silk screen are wrapped completely, finally live heat shrinkage film with sealing cranse fixing seal Upper and lower end parts, prevent in experimentation that confined pressure oil penetrates into sample or permeating medium leaks;

(4) seaming chuck is arranged on testing machine, lower crossover sub is connected with the push-down head on testing machine, to overall infiltration After system is vacuumized, increase confined pressure and axle is depressed into predetermined value, the infiltration upstream and downstream pressure of permeating medium is reached P0, 5~10 points Zhong Hou, increases infiltration upstream pressure to Pi, permeate downstream pressure and still keep P0Constant, measurement respectively permeates upstream and downstream pressure at any time Between Changing Pattern and permeability.

The described special hypotonic rock radial penetration rate computational methods of invention:

The present invention meets hypothesis below in experimentation:

(1) in process of osmosis, Darcy's law is set up;

(2) Gas seepage is perfect gas.

Computing permeability formula of the present invention is as follows:

P1-P2=(Pi-P0)e-at (2)

Formula (2) changes with time rule, formula for the pressure of the upstream and downstream pressure vessel of osmosis system in the inventive method (2) coefficient a is relevant with selected permeating medium in, when permeating medium is gas, the infiltration of sample can be calculated according to formula (3) Rate;When permeating medium is liquid, the permeability of sample can be calculated according to formula (4).

If upstream and downstream volume of a container (containing conduit volume) equal, i.e. (V in osmosis system1=V2=V), formula (3) and formula (4) can be reduced to:

In formula (2)~formula (6):

K is the radial penetration rate (m of sample2), P1、P2The pressure of upstream and downstream pressure vessel respectively in process of osmosis (Pa), Pi、P0The initial pressure (Pa) of upstream and downstream pressure vessel respectively in process of osmosis,Respectively process of osmosis The average pressure (Pa) of middle upstream and downstream pressure vessel, PfIt is the final balance pressure (Pa) of osmosis system, V1、V2Respectively permeate During upstream and downstream container volumes (m3), R1、R2The respectively inside radius of rock sample, outer radius (m), L are rock sample Highly (m), t is experimental period (s), and μ is the coefficient of viscosity (Pas) of permeating medium, and β is the compressed coefficient (Pa of liquid-1)。

In the above method, a metafiltration paper is preferably placed in the interface of seaming chuck and upper crossover sub, with preventing sample Little particle blocks infiltration lane.

In the above method, the infiltration silk screen can select woven wire, such as wire netting, copper mesh.

In the above method, using existing laboratory routine test machine, pressure head request for utilization number is 201610084533.1 Patent application publication " realizes that the method and device for exerting of hydraulic fracturing experiments are tried with rock in conventional rock mechanics experiment machine Pressure head in sample ".

In the above method, can complete penetration testing and resultant stress under different confined pressures and strain by changing confined pressure or axle pressure Under the conditions of penetration testing.

Selected permeating medium can be liquid in the method for the invention, or gas, the difference in experimentation Place mainly has at following 2 points, one is the pretreatment to sample before penetration testing is carried out is different, if permeating medium is liquid, Hold-up pretreatment need to be carried out to sample;If permeating medium is gas, pretreatment need to be dried to sample.The second is infiltration There is certain difference in rate computing formula, because difference is smaller each other, this patent hereinafter unless otherwise indicated, is oozed with gas As a example by saturating medium.

The invention has the advantages that:

1st, permeability method of testing of the present invention and computing formula can effectively improve permeability testing efficiency, be oozed with conventional Saturating experimental technique is compared, and when sample has same diameter and height, experimental technique of the present invention may be such that in same time Osmotic pressure decline of pressure speed at least lifts an order of magnitude.

2nd, the present invention can carry out quantitative analysis (especially footpath to Penetration Signature of the special hypotonic rock under different stress To the analysis of Penetration Signature), the seepage characteristic of understanding complexity that can be more deep, for unconventional petroleum resources exploitation, energy The engineering practices such as source storage are significant.

3rd, crossover sub of the present invention, sample etc. are easy to processing and fabricating, and experimental implementation is simple, easy to utilize.

Brief description of the drawings

Fig. 1 is the structural representation of crossover sub on testing machine of the present invention.

Fig. 2 is the structural representation of crossover sub under testing machine of the present invention.

Fig. 3 is the sectional view of rock sample of the present invention.

Fig. 4 is the assembling schematic diagram of testing machine crossover sub of the present invention and rock sample.

Fig. 5 be embodiment 1 in upstream and downstream container pressure change over time curve.

Fig. 6 is permeameter nomogram in embodiment.

In figure, 1-upper crossover sub, 1-1-boss, 2-lower crossover sub, 2-1-bulge loop, 2-2-mounting hole, 3- Sample, 4-infiltration silk screen, 5-heat shrinkage film, 6-bonding agent, 7-sealing cranse, 8-seaming chuck.

Specific embodiment

Below by specific embodiment, to special hypotonic rock radial penetration rate testing experiment method of the present invention and institute Crossover sub, rock sample is stated to be described further.

Embodiment 1

For the sample component of special hypotonic rock radial penetration rate test, structure as Figure 1-3, is tried by cylindrical rock Sample 3, agent structure is that the upper crossover sub 1 and lower crossover sub 2 of cylinder are constituted, and the rock sample center processing is promising to ooze Saturating medium provides the cylindrical hole of radial penetration passage, is designed with and rock sample cylindrical hole at the upper crossover sub bottom center The embedded cylindrical boss 1-1 for coordinating;It is designed with the end face center of the lower crossover sub and is embedded in rock sample cylindrical hole The cylindrical bulge loop 2-1 of cooperation, is designed with bottom center and mounting hole 2-2 is engaged with testing machine push-down head, lower crossover sub Center is machined with the permeating medium opening from mounting hole insertion top surface cylinder bulge loop.Upper crossover sub and lower crossover sub The equal diameters of main diameter and rock sample.The rock sample is that the shale of collection is appeared through boring, cutting, grind, drill Operation processing is prepared from.

Size:The height of the body cylindrical of upper crossover sub is 10mm, and external diameter is 50mm, and the height of convex platform is 5mm, on The a diameter of 5mm of boss;The height of the body cylindrical of lower crossover sub is 50mm, and external diameter is 50mm, and depth of groove is 25mm, groove A diameter of 20mm, the height of the lower convex platform of lower crossover sub is 5mm, a diameter of 5mm.The height L=100mm of rock sample, The inside radius R of rock sample1=5mm, outer radius R2=50mm.

Special hypotonic rock radial penetration rate testing experiment method based on above-mentioned testing machine crossover sub rock sample, step It is as follows:

(1) pretreatment is dried to the experiment of special hypotonic rock, with nitrogen as permeating medium;

(2) boss on upper crossover sub bottom surface, the bulge loop on lower crossover sub top surface are respectively embedded into rock sample In center cylindrical hole, and end face is docked with upper crossover sub and lower crossover sub smear bonding agent in rock sample and be allowed to mutually viscous Connect and be fixed as one, revealed from sample end face with permeating medium in preventing experimentation, then by rock sample, upper crossover sub Integrally sealed with sealing sample bag together with lower crossover sub, prevent moisture in air from being waved into moisture in sample and sample Hair, stands after sealing, bonding agent is given full play to bonding effect;

(3) after the sample and testing machine crossover sub for after quiet at least 24 hours, taking out sealing, seaming chuck is placed on and is turned Changing-over overhead, top surface docking, and seaming chuck and upper crossover sub interface place a metafiltration paper with small in preventing sample Particle blocks infiltration pipeline, wraps crossover sub, part in whole rock samples, whole with infiltration silk screen wire netting afterwards Seaming chuck, and infiltration silk screen is higher by crossover sub at least 2mm, infiltration silk screen does not touch lower crossover sub, is wrapped with heat shrinkage film Mode fixed silk screen is permeated, the height that wraps meets cladding infiltration silk screen completely and exceeds each joining place up and down, then with close Envelope cranse fixes heat shrinkage film upper and lower end parts, and confined pressure oil penetrates into sample in preventing experimentation;

(4) seaming chuck is arranged on testing machine, lower crossover sub is connected with the push-down head on testing machine, to overall infiltration After system is vacuumized, increase confined pressure to 3MPa, axle and be depressed into 3MPa, opening gas cylinder makes infiltration upstream and downstream pressure reach P0= After 0.2MPa, 5-10 minute, increase infiltration upstream pressure to Pi=2.2MPa, infiltration downstream pressure still keeps P0It is constant, survey respectively Amount infiltration upstream and downstream reservoir pressure changes with time rule;

(6) after off-test, sample and crossover sub are removed from testing machine, the sample for bonding together and conversion is connect Bonding agent is baked to failure dismounting, cleaning crossover sub in case follow-up test is reused by head electric furnace.

Infiltration upstream and downstream reservoir pressure changes with time rule as shown in figure 5, first according to infiltration upstream and downstream pressure Force container pressure changes with time rule, tries to achieveWith the slope of time t, upstream and downstream container in the present embodiment Volume (containing conduit volume) equal, i.e. (V1=V2=V), therefore according to the radial penetration rate k of formula (5) calculating sample,

After the completion of the test of this permeability, every after half an hour, permeability is tested under this condition again, to ensure experiment Repeatability.The permeability for measuring the sample twice is respectively 2.084 × 10-19、2.062×10-19, with preferably can again Renaturation.

Claims (10)

1. the sample component of special hypotonic rock radial penetration rate test is used for, it is characterised in that including cylindrical rock sample (3), agent structure is the upper crossover sub (1) and lower crossover sub (2) of cylinder, and the rock sample center processing is promising to ooze Saturating medium provides the cylindrical hole of radial penetration passage, is designed with and rock sample cylindrical hole at the upper crossover sub bottom center The embedded cylindrical boss (1-1) for coordinating;It is designed with the end face center of the lower crossover sub embedding with rock sample cylindrical hole Enter the cylindrical bulge loop (2-1) of cooperation, be designed with bottom center and be engaged mounting hole (2-2) with push-down head, center is machined with From the permeating medium opening of mounting hole insertion top surface cylinder bulge loop.
2. the sample component of special hypotonic rock radial penetration rate test is used for according to claim 1, it is characterised in that upper to turn Changing-over head and the diameter of lower crossover sub and the equal diameters of rock sample.
3. the sample component of special hypotonic rock radial penetration rate test is used for according to claim 1, it is characterised in that described The external diameter of rock sample is 50~100mm, and internal diameter is 5~10mm.
4. the sample component of special hypotonic rock radial penetration rate test is used for according to claim 3, it is characterised in that rock The height of sample is 2~2.5 times of its external diameter.
5., according to one of Claims 1-4 sample component tested for special hypotonic rock radial penetration rate, its feature exists It is 10~20mm in the height of the body cylindrical of the upper crossover sub, the boss height on bottom surface is 5~10mm, and diameter is less than The cylindrical hole of rock sample center.
6., according to one of Claims 1-4 sample component tested for special hypotonic rock radial penetration rate, its feature exists In the lower crossover sub body cylindrical height be 50~70mm, install 20~40mm of hole depth, mounting hole it is a diameter of 20~40mm.
7. the sample component of special hypotonic rock radial penetration rate test is used for according to claim 6, it is characterised in that lower turn Bulge loop (2-1) on the face of the changing-over crown is highly 5~10mm, and external diameter is less than rock sample center cylindrical hole.
8. the experiment side of one of claim 1 to the 7 sample component for the test of special hypotonic rock radial penetration rate is based on Method, it is characterised in that comprise the following steps:
(1) the row pretreatment work that advances by infiltration is carried out to the experiment of special hypotonic rock, if permeating medium is liquid, liquid is carried out to sample Body saturation is pre-processed;If permeating medium is gas, pretreatment need to be dried to sample;
(2) boss on upper crossover sub bottom surface, the bulge loop on lower crossover sub top surface are respectively embedded into the center of rock sample In cylindrical hole, and rock sample docked with upper crossover sub and lower crossover sub end face smear bonding agent be allowed to be mutually bonded it is solid Be set to one, to prevent permeating medium in experimentation from being revealed from sample end face, then by rock sample, upper crossover sub and under Crossover sub is integrally sealed with sealing sample bag together, prevents moisture in air from entering moisture evaporation in sample or sample;
(3) seaming chuck is docked with upper crossover sub top surface, and interface is that the medium for penetrating can be made to revert to seaming chuck centre bore It is interior, crossover sub and part seaming chuck in whole rock samples, whole first are wrapped with infiltration silk screen afterwards, reusable heat contracting film is complete Infiltration silk screen and the joining place up and down wrapped beyond infiltration silk screen are wrapped, it is upper and lower finally to live heat shrinkage film with sealing cranse fixing seal End, prevents in experimentation that confined pressure oil penetrates into sample or permeating medium leaks;
(4) seaming chuck is arranged on testing machine, lower crossover sub is connected with the push-down head on testing machine, to overall osmosis system After vacuumizing, increase confined pressure and axle is depressed into predetermined value, the infiltration upstream and downstream pressure of permeating medium is reached P0, after 5-10 minutes, Increase infiltration upstream pressure to Pi, permeate downstream pressure and still keep P0Constant, measurement infiltration upstream and downstream pressure is with the time respectively Changing Pattern and permeability.
9. special hypotonic rock radial penetration rate testing experiment method according to claim 8, it is characterised in that calculate permeability When, first changed with time rule formula P by the pressure of the upstream and downstream pressure vessel of osmosis system1-P2=(Pi-P0)e-atMeter Coefficient a is calculated,
When permeating medium is gas, permeability according to the following formula:
a = π L k μ ln ( R 2 / R 1 ) ( P ‾ 1 V 1 + P ‾ 2 V 2 )
When permeating medium is liquid, permeability according to the following formula:
a = π L k μ β ln ( R 2 / R 1 ) ( 1 V 1 + 1 V 2 ) .
In above-mentioned formula, k is the radial penetration rate of sample, P1、P2The pressure of upstream and downstream pressure vessel respectively in process of osmosis, V1、V2Upstream and downstream container volume, R respectively in process of osmosis1、R2The respectively inside radius of rock sample, outer radius, L is rock The height of stone sample, t is experimental period, and μ is the coefficient of viscosity of permeating medium, and β is the compressed coefficient of liquid.
10. special hypotonic rock radial penetration rate testing experiment method according to claim 8, it is characterised in that in seaming chuck and The interface of upper crossover sub places a metafiltration paper.
CN201710023302.4A 2017-01-12 2017-01-12 Sample assembly for radial permeability test of ultra-low permeability rock and test method thereof CN106841000B (en)

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