CN103630670B - A kind of test unit measuring Characteristics of Damaged Rock Salt self-recoverage amount - Google Patents
A kind of test unit measuring Characteristics of Damaged Rock Salt self-recoverage amount Download PDFInfo
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- CN103630670B CN103630670B CN201310691975.9A CN201310691975A CN103630670B CN 103630670 B CN103630670 B CN 103630670B CN 201310691975 A CN201310691975 A CN 201310691975A CN 103630670 B CN103630670 B CN 103630670B
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Abstract
The invention discloses a kind of test unit measuring Characteristics of Damaged Rock Salt self-recoverage amount, comprise cylindrical shell, heating pad, base, upper cover, upperpush rod, lower support bar, two-way servo-hydraulic station, gas-holder of setting out on a journey, lower road gas-holder, differential manometer and air pressure loading device; The oil-out at two-way servo-hydraulic station is communicated with in cylindrical shell by pipeline, gas-holder of setting out on a journey is communicated with in cylindrical shell respectively by pipeline with the gas outlet of lower road gas-holder, differential manometer is arranged on sets out on a journey between gas-holder and lower road gas-holder, and the gas outlet of air pressure loading device is connected with the air intake opening of gas-holder of setting out on a journey and the air intake opening of lower road gas-holder respectively by pipeline.The arrangement achieves the synchro measure to damage self-recoverage amount in the self-recoverage process of Characteristics of Damaged Rock Salt, measuring speed is fast, precision is high; Can by changing the stress residing for Characteristics of Damaged Rock Salt, the self-recoverage process under the true complex geological condition of temperature and humidity state simulation the overall process realizing self-recoverage amount measure in real time.
Description
Technical field
The present invention relates to the self-healing test unit of a kind of Characteristics of Damaged Rock Salt, particularly relate to a kind of test unit measuring Characteristics of Damaged Rock Salt self-recoverage amount.
Background technology
It is low that salt rock mass has porosity, and perviousness is little, the damage advantages such as automatic recovery ability is strong, adds that hydrogeological condition is simple, distribute the good characteristic such as wide, and being known as in the world is the ideal place of oil, gas storage and high-level radioactive waste.But in salt cave water-solvent method phase and bank operation phase, time still, there is the generation of the accidents such as cavity inefficacy and oil gas leakage.In the salt cave water-solvent method phase, the original stress equilibrium state of rock salt due to the disturbance of cavity solution mining, makes cavity Stress relieving of surrounding rocks, certainly will produce Lycopodium chinense Christ moving-coil around cavity, causes the damage and failure of rock salt; In oil-gas storage operation process, because cavity inner fluid is frequently taken out, noted, cavity fluid pressure constantly fluctuates, in addition the acting in conjunction of terrestrial stress, and chamber wall rock salt also can be caused to sustain damage and occur crack.These damages add the perviousness of rock salt, are unfavorable for the sealing of cavity and stablize.Meanwhile, under certain geologic condition, Characteristics of Damaged Rock Salt crystal can form new crystal structure by recrystallization at injury region completely, impels the crack healing of damage rock salt, improves the mechanical characteristic of the impaired rock salt of rock salt inside cavity, reduce permeability.Therefore, the damage self-recoverage mechanism grasping rock salt has most important theories meaning and practical value to the diaster prevention and control of building chamber phase and oil-gas depot operation phase.And the method for Measurement accuracy Characteristics of Damaged Rock Salt self-recoverage amount must be had to the research of rock salt damage-self-recoverage mechanism.At present, domestic also not for the Special Equipment of Characteristics of Damaged Rock Salt self-recoverage quantity research, in relevant research, the measuring equipment of the self-healing maintenance facility of Characteristics of Damaged Rock Salt and self-recoverage amount separates, causing can not continuous coverage to damage self-recoverage process, and can not realize the measurement that rock salt carries out self-recoverage amount under complicated self-recoverage condition.This measuring method was both lost time, and the impact again by rock salt self-recoverage environment change causes measurement result inaccurate.
Be separated with measuring equipment to solve self-recoverage maintenance facility in traditional measurement Characteristics of Damaged Rock Salt self-recoverage metering method, can not Measurement accuracy self-recoverage amount continuously, and the problem of time and effort consuming, need to find a kind of Characteristics of Damaged Rock Salt self-recoverage quantitative determination test unit combining self-recoverage maintenance platform and self-recoverage measuring table.
Summary of the invention
For weak point of the prior art, the invention provides a kind of test unit measuring Characteristics of Damaged Rock Salt self-recoverage amount.This device utilizes self-recoverage maintenance and self-recoverage to measure system ensemble, carrys out the test unit of its self-recoverage amount of omnidistance Simultaneous Determination by measuring Characteristics of Damaged Rock Salt permeability.
In order to solve the problems of the technologies described above, present invention employs following technical scheme:
Measure a test unit for Characteristics of Damaged Rock Salt self-recoverage amount, comprise cylindrical shell, heating pad, base, upper cover, upperpush rod, lower support bar, two-way servo-hydraulic station, gas-holder of setting out on a journey, lower road gas-holder, differential manometer and air pressure loading device, described heating pad is arranged on the inwall of cylindrical shell, and described base is arranged on the bottom of cylindrical shell and is sealed and matched with the lower port of cylindrical shell, and described upper cover is arranged on the top of cylindrical shell and is sealed and matched with the upper port of cylindrical shell, described upperpush rod is vertically arranged on and covers, and the bottom of upperpush rod puts in cylindrical shell, and described lower support post to be vertically arranged on base and to be positioned at cylindrical shell, and the bottom of upperpush rod is corresponding with the top in the vertical direction of lower support post, the oil-out at described two-way servo-hydraulic station is communicated with in cylindrical shell by pipeline, described upperpush rod vertically arranges inlet channel, described in the set out on a journey gas outlet of gas-holder to be connected with inlet channel by pipeline and to be communicated with in cylindrical shell by inlet channel, described lower support post vertically arranges air inlet through hole, and the gas outlet of described lower road gas-holder to be connected with air inlet through hole by pipeline and to be communicated with in cylindrical shell by air inlet through hole, the Single port of described differential manometer is communicated with in gas-holder of setting out on a journey, and the another port of differential manometer is communicated with in the gas-holder of lower road, the gas outlet of described air pressure loading device is connected with the air intake opening of gas-holder of setting out on a journey and the air intake opening of lower road gas-holder respectively by pipeline, the pipeline be connected between the gas outlet of described air pressure loading device and the air intake opening of gas-holder of setting out on a journey installs by-pass valve control I, the pipeline be connected between the gas outlet of described air pressure loading device and the air intake opening of lower road gas-holder installs by-pass valve control II, described differential manometer and the tank connected pipeline of gas storage of setting out on a journey install by-pass valve control III, described differential manometer and the tank connected pipeline of lower road gas storage install by-pass valve control IV, the pipeline that described gas-holder of setting out on a journey is connected with inlet channel installs by-pass valve control V, the pipeline that described lower road gas-holder is connected with air inlet through hole installs by-pass valve control VI.
As a preferred embodiment of the present invention, described differential manometer is connected with computing machine.
As another kind of preferred version of the present invention, the oil-in at described two-way servo-hydraulic station is connected with oil cylinder.
As another preferred version of the present invention, described differential manometer and the tank connected pipeline of gas storage of setting out on a journey install rain glass of setting out on a journey, described differential manometer and the tank connected pipeline of lower road gas storage install lower road rain glass.
The invention has the beneficial effects as follows: the arrangement achieves the synchro measure to damage self-recoverage amount in the self-recoverage process of Characteristics of Damaged Rock Salt, measuring speed is fast, precision is high; More can by changing the stress residing for Characteristics of Damaged Rock Salt, the self-recoverage process under the true complex geological condition of temperature and humidity state simulation the overall process realizing self-recoverage amount measure, in real time for the damage self-recoverage mechanism studying rock salt provides comprehensive test basis and theories integration.
Accompanying drawing explanation
Fig. 1 is the structural representation of Characteristics of Damaged Rock Salt self-recoverage amount determining device.
In accompanying drawing: 1-rock salt sample; 2-heating pad; 3-two-way servo-hydraulic station; 4-oil cylinder; 5-computing machine; 6-air pressure loading device; 7-gas-holder of setting out on a journey; 8-lower road gas-holder; 9-rain glass of setting out on a journey; 10-lower road rain glass; 11-differential manometer; 12-computing machine; 13-by-pass valve control I; 14-by-pass valve control II; 15-by-pass valve control III; 16-by-pass valve control IV; 17-by-pass valve control V; 18-by-pass valve control VI; 19-cylindrical shell; 20-base; 21-upper cover; 22-upperpush rod; 23-lower support post.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figure 1, measure a test unit for Characteristics of Damaged Rock Salt self-recoverage amount, comprise cylindrical shell 19, heating pad 2, base 20, upper cover 21, upperpush rod 22, lower support bar 23, two-way servo-hydraulic station 3, gas-holder 7 of setting out on a journey, lower road gas-holder 8, differential manometer 11, air pressure loading device 6, computing machine 5, computing machine 12 and oil cylinder 4.Heating pad 2 is arranged on the inwall of cylindrical shell 19, and base 20 is arranged on the bottom of cylindrical shell 19 and is sealed and matched with the lower port of cylindrical shell 19, and upper cover 21 is arranged on the top of cylindrical shell 19 and is sealed and matched with the upper port of cylindrical shell 19.Upperpush rod 22 is vertically arranged on upper cover 21, and the bottom of upperpush rod 22 puts in cylindrical shell 19, and lower support post 23 to be vertically arranged on base 20 and to be positioned at cylindrical shell 19, and the bottom of upperpush rod 22 is corresponding with the top in the vertical direction of lower support post 23.The oil-in at two-way servo-hydraulic station 3 is connected with oil cylinder 4, and the oil-out at two-way servo-hydraulic station 3 is communicated with in cylindrical shell 19 by pipeline, and computing machine 5 controls two-way hydraulic system by multi-channel data acquisition unit.Upperpush rod 22 vertically arranges inlet channel, and the gas outlet of gas-holder 7 of setting out on a journey to be connected with inlet channel by pipeline and to be communicated with in cylindrical shell 19 by inlet channel.Lower support post 23 vertically arranges air inlet through hole, and the gas outlet of lower road gas-holder 8 to be connected with inlet channel by pipeline and to be communicated with in cylindrical shell 19 by inlet channel.The Single port of differential manometer 11 is communicated with in gas-holder 7 of setting out on a journey, and the another port of differential manometer 11 is communicated with in lower road gas-holder 8, and differential manometer 11 is connected with computing machine 12.The gas outlet of air pressure loading device 6 is connected with the air intake opening of gas-holder 7 of setting out on a journey and the air intake opening of lower road gas-holder 8 respectively by pipeline.The pipeline be connected between the gas outlet of air pressure loading device 6 and the air intake opening of gas-holder 7 of setting out on a journey installs by-pass valve control I 13, the pipeline be connected between the gas outlet of air pressure loading device 6 and the air intake opening of lower road gas-holder 8 installs by-pass valve control II 14, the pipeline that differential manometer 11 is connected with gas-holder 7 of setting out on a journey is installed by-pass valve control III 15 and rain glass 9 of setting out on a journey, the pipeline that differential manometer 11 is connected with lower road gas-holder 8 installs by-pass valve control IV 16 and lower road rain glass 10, the pipeline that gas-holder 7 of setting out on a journey is connected with inlet channel installs by-pass valve control V 17, the pipeline that lower road gas-holder 8 is connected with air inlet through hole installs by-pass valve control VI 18.
When using the test unit of this mensuration Characteristics of Damaged Rock Salt self-recoverage amount, concrete steps are as follows: 1) carry out pre-service to the water percentage of Characteristics of Damaged Rock Salt, make its self-recoverage environment reach the humidity of setting.2) be installed on Characteristics of Damaged Rock Salt self-recoverage amount determining device by the rock salt test specimen needing to carry out damaging self-recoverage measurement amount, rock salt test specimen is crushed between upperpush rod 22 and lower support post 23.3) open two-way servo-hydraulic station 3, heating pad 2 electrified regulation, is exerted pressure by upperpush rod 22 and lower support post 23 pairs of Characteristics of Damaged Rock Salt test specimens, stress, temperature, the humidity self-recoverage environment of simulation setting Characteristics of Damaged Rock Salt.4) open by-pass valve control I 13 and by-pass valve control II 14, by air pressure loading device to insufflation gas in set out on a journey gas-holder 7 and lower road gas-holder 8 two isopyknic gas-holder, when setting out on a journey, gas-holder 7 air pressure reaches setting value
p 1 time closing control valve I 13, road gas-holder 8 air pressure reaches setting value instantly
p 2 time closing control valve II 14.5) open by-pass valve control III 15, by-pass valve control IV 16, by-pass valve control V 17 and by-pass valve control VI 18, utilize computing machine 12 every schedule time monitoring record differential manometer 11 reading situation of change, draw the pressure reduction of set out on a journey gas-holder 7 and lower road gas-holder 8
Δ Pwith the time
tfuntcional relationship
Δ P=
f (t).6) when the reading of differential manometer 11 is close to bottom line threshold values
(
) time, repeat step 4) and 5), until meet the testing requirements of Characteristics of Damaged Rock Salt self-recoverage.7) test figure is substituted into the permeability that computing permeability formulae discovery goes out each time period
k.8) the damage self-recoverage amount of rock salt is calculated by the situation of change of permeability.
The Computing Principle of damage self-recoverage amount is as follows:
Suppose be ideal gas by the gas medium of Characteristics of Damaged Rock Salt sample and met Darcy's law, gas piping is without expansion, and so permeability equation is:
（1）
In formula:
vvolumetric standard volume, cm
3, here
v=
v 1 =
v 2 ;
Δ p i /
Δ p f it is the ratio of initial pressure difference and final pressure difference;
Δ tduration of test runs, s;
l s rock salt piece lengths, cm;
a s rock salt test specimen cross-sectional area, cm
2;
μit is the viscosity coefficient (pa. s) of gas medium;
βthe compressibility coefficient (pa of gas medium
-1).
Because the effective impact of above-mentioned hypothesis on permeability is relatively little, the result of calculation of the method can the permeability variation situation of rational prediction rock salt test specimen.
To upper and lower road gas-holder pressure reduction and the funtcional relationship of time
Δ P=
f (t)take the logarithm in both sides:
（2）
Order:
（3）
Then in the extremely short time
Δ tin,
（4）
Formula (4) is substituted into formula (1), obtains the funtcional relationship of Characteristics of Damaged Rock Salt permeability and time:
(5)
The self-recoverage amount of definition Characteristics of Damaged Rock Salt is:
（6）
In formula,
rfor the self-recoverage amount of Characteristics of Damaged Rock Salt;
k 0 it is self-recoverage
t 0 the permeability of Characteristics of Damaged Rock Salt sample when moment starts;
k t it is self-recoverage a period of time
tthe permeability of Characteristics of Damaged Rock Salt after moment.
Simultaneous formula (3), formula (5) and formula (6) just can show that the expression formula of any time damage rock salt self-recoverage amount is:
（7）
Wherein,
f (t)upper and lower road gas-holder pressure reduction
Δ Pwith the self-recoverage time
tfunction,
in self-recoverage process
tmoment
Δ Prate of change,
it is self-recoverage
t 0 the pressure reduction of gas-holder when moment starts,
be
t 0 moment
Δ Prate of change.
f (t)simple process can be carried out by computing machine to the data gathered to obtain, as can be seen from formula, no longer containing other unknown parameters, therefore can calculate the self-recoverage amount of each time period in Characteristics of Damaged Rock Salt self-recoverage process.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (1)
1. one kind measures the test unit of Characteristics of Damaged Rock Salt self-recoverage amount, it is characterized in that, comprise cylindrical shell (19), heating pad (2), base (20), upper cover (21), upperpush rod (22), lower support post (23), two-way servo-hydraulic station (3), gas-holder of setting out on a journey (7), lower road gas-holder (8), differential manometer (11) and air pressure loading device (6), described heating pad (2) is arranged on the inwall of cylindrical shell (19), described base (20) is arranged on the bottom of cylindrical shell (19) and is sealed and matched with the lower port of cylindrical shell (19), and described upper cover (21) is arranged on the top of cylindrical shell (19) and is sealed and matched with the upper port of cylindrical shell (19), described upperpush rod (22) is vertically arranged on upper cover (21), the bottom of upperpush rod (22) puts in cylindrical shell (19), lower support post (23) is vertically arranged on base (20) and goes up and be positioned at cylindrical shell (19), and the bottom of upperpush rod (22) is corresponding with the top in the vertical direction of lower support post (23), the oil-out of described two-way servo-hydraulic station (3) is communicated with in cylindrical shell (19) by pipeline, described upperpush rod (22) vertically arranges inlet channel, described in the set out on a journey gas outlet of gas-holder (7) to be connected with inlet channel by pipeline and by being communicated with in inlet channel and cylindrical shell (19), described lower support post (23) vertically arranges air inlet through hole, and the gas outlet of described lower road gas-holder (8) is connected by pipeline with air inlet through hole and passes through air inlet through hole and is communicated with in cylindrical shell (19), the Single port of described differential manometer (11) is communicated with in gas-holder of setting out on a journey (7), and the another port of differential manometer (11) is communicated with in lower road gas-holder (8), the gas outlet of described air pressure loading device (6) is connected with the air intake opening of gas-holder of setting out on a journey (7) and the air intake opening on lower road gas-holder (8) respectively by pipeline, the pipeline be connected between the gas outlet of described air pressure loading device (6) and the air intake opening of gas-holder of setting out on a journey (7) is installed by-pass valve control I (13), the pipeline be connected between the gas outlet of described air pressure loading device (6) and the air intake opening on lower road gas-holder (8) installs by-pass valve control II (14), the pipeline that described differential manometer (11) is connected with gas-holder of setting out on a journey (7) installs by-pass valve control III (15), the pipeline that described differential manometer (11) is connected with lower road gas-holder (8) installs by-pass valve control IV (16), the pipeline that described gas-holder of setting out on a journey (7) is connected with inlet channel installs by-pass valve control V (17), the pipeline that described lower road gas-holder (8) is connected with air inlet through hole installs by-pass valve control VI (18),
Described differential manometer (11) is connected with computing machine (12);
The oil-in of described two-way servo-hydraulic station (3) is connected with oil cylinder (4);
The pipeline that described differential manometer (11) is connected with gas-holder of setting out on a journey (7) installs rain glass of setting out on a journey (9), the pipeline that described differential manometer (11) is connected with lower road gas-holder (8) is installed lower road rain glass (10).
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| CN105675644B (en) * | 2016-01-13 | 2016-09-28 | 石家庄铁道大学 | A kind of seal test device of constant temperature and pressure |
| CN106248491A (en) * | 2016-07-25 | 2016-12-21 | 黑龙江科技大学 | Damage of rock and Permeation Test System |
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