CN106198344B - The rock diffusion coefficient measurement device and method being automatically injected based on micro-pressure-difference - Google Patents
The rock diffusion coefficient measurement device and method being automatically injected based on micro-pressure-difference Download PDFInfo
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- CN106198344B CN106198344B CN201610506168.9A CN201610506168A CN106198344B CN 106198344 B CN106198344 B CN 106198344B CN 201610506168 A CN201610506168 A CN 201610506168A CN 106198344 B CN106198344 B CN 106198344B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
Abstract
The present invention provides a kind of rock diffusion coefficient measurement devices and method being automatically injected based on micro-pressure-difference, wherein, the device includes: natural air-air source, Nitrogen source gases, first times of volume increasing device, second times of volume increasing device, differential pressure pick-up, confining pressure tracking pump, pressurization injection pump, the first displacement transducer, second displacement transmitter and core holding unit, wherein, one end that first times of volume increasing device is connected with natural air-air source is connected with the first diffuser casing, and the other end is connected with pressurization injection pump；One end that second times of volume increasing device is connected with Nitrogen source gases is connected with the second diffuser casing, and the other end is connected with pressurization injection pump；Confining pressure tracking pump is connected with the core holding unit between the first diffuser casing and the second diffuser casing.The embodiment of the present invention solves the problems, such as measurement result inaccuracy caused by the presence of the pressure difference between two diffuser casings, while can carry out automatic operation to the whole process of diffusion injection, reduce manually-operated error, effectively increase measurement result accuracy.
Description
Technical field
The present invention relates to oil-gas exploration technical field, in particular to a kind of rock diffusion system being automatically injected based on micro-pressure-difference
Number measurement device and method.
Background technique
Diffusion refers to hydrocarbon gas under the action of concentration gradient, and gas molecule is from high concentration region by various media to low
Concentration area free migration reaches a kind of physical process of balance.Diffusion is one of important mechanism of oil-gas migration, it for
The fortune of oil gas, especially natural gas (light-weight since molecule is small, activity is strong, so having stronger diffusivity in underground)
It moves, assemble, all being played a crucial role at hiding, preservation and destruction.
For aggregated gas reservoir, except the sealing ability of cap rock itself, tomography influence in addition to, supracrustal rocks are for hydrocarbon
The diffusivity of class is to influence the most important factor of gas reservoir Late reformation, destruction；However, in addition to as conventional traditional destruction because
Element, positive effect and contribution may also be generated by being diffused in gas migration, aggregation and Filling process, especially in unconventional densification
The fields such as sandstone, shale gas.Diffusion coefficient passes through the important evaluation parameter of rock diffusion velocity speed as description natural gas, is
Gas diffusion charging amount and windage calculate essential important parameter.
Experimental determination diffusion coefficient mostly uses indirect method, i.e., passes through the diffusing capacity of sample in measuring certain time
Or concentration, then diffusion coefficient value is determined or acquired by formula by these measured values.The diffusion coefficient routinely measured is due to by reality
There is deviations for the real diffusivity of rock for testing under the conditions of the limitation of Temperature-pressure Conditions and Geologic Time, and practical geology, and
With the enhancing that buried depth increases, compacting diagenesis act in the geologic(al) period, diffusion coefficient of natural gas is also in the different geologic(al) periods
Different.
It can be seen that utmostly rock hydro carbons diffusion coefficient is measured close to practical geology high-temperature and high-pressure conditions, for standard
Really hydro carbons diffusivity in evaluation rock, assesses Gas diffusion charging amount and diffusion loss amount, carries out routine, very natural gas
Migration, aggregation, at hiding and save research and resource assessment all there is extremely important effect.
Currently, the mode of pressure trapping gas injection is generally used in experimental determination rock when hydro carbons diffusion coefficient, i.e., it is logical
The speed and flow for manually controlling air inlet are crossed, pressure needed for making diffuser casing gas injection pressure reach experiment, however, manual operation can not
Avoid having error, so that the pressure imbalance of two diffuser casings or speed are inconsistent.Since diffusion coefficient is typically all smaller
Numerical value, the presence of two sides diffuser casing pressure difference inevitably result in two sides gas not and be diffuse into one another but under the effect of the pressure one
Side gas is permeated to the other side, so that final result is inaccurate, this phenomenon is particularly evident under the conditions of high temperature and pressure experiment.
In view of the above-mentioned problems, currently no effective solution has been proposed.
Summary of the invention
The embodiment of the invention provides a kind of rock diffusion coefficient measurement devices being automatically injected based on micro-pressure-difference, to reach
The purpose of the pressure difference between two diffuser casings is reduced, which includes:
Natural air-air source, Nitrogen source gases, first times of volume increasing device, second times of volume increasing device, differential pressure pick-up, pressurization injection pump,
Confining pressure tracks pump, the first displacement transducer, second displacement transmitter and core holding unit, wherein
The natural air-air source is connected with first times of volume increasing device, in the natural air-air source and first times of increase-volume
The first pressure regulator valve of the flow and flow rate of control control gas is connected between device；
The Nitrogen source gases are connected with second times of volume increasing device, the Nitrogen source gases and second times of volume increasing device it
Between be connected with control control gas flow and flow rate the second pressure regulator valve；
The differential pressure pick-up is connected between first times of volume increasing device and second times of volume increasing device, and is connected to
Between first pressure regulator valve and second pressure regulator valve, for detecting first times of volume increasing device and second times of volume increasing device
Between pressure difference；
One end that first times of volume increasing device is connected with the natural air-air source is connected with the first diffuser casing, the other end and increasing
Injection pump is pressed to be connected；
One end that second times of volume increasing device is connected with the Nitrogen source gases is connected with the second diffuser casing, the other end with it is described
Injection pump is pressurized to be connected；
The confining pressure tracking pump is connected with the core holding unit between first diffuser casing and second diffuser casing；
First displacement transducer is connected with first diffuser casing, and the second displacement transmitter and described second expands
It dissipates room to be connected, for carrying out flexible adjustment in the case where core holding unit both ends diffusion gas pressure inside is different.
In one embodiment, the bearing capacity of first times of volume increasing device and second times of volume increasing device is more than or equal to
80MPa, heatproof are more than or equal to 220 DEG C.
In one embodiment, the bearing capacity of the differential pressure pick-up is more than or equal to 80MPa, precision 0.01MPa.
In one embodiment, above-mentioned gas diffusion coefficients equipment further include: first pressure sensor, first micro-
Adjust valve, second pressure sensor and the second reset valve, wherein
First reset valve is connected between first times of volume increasing device and first pressure regulator valve in a manner of branch；
Second reset valve is connected between second times of volume increasing device and second pressure regulator valve in a manner of branch.
It is connected with third pneumatic operated valve and the 6th pneumatic operated valve between first times of volume increasing device and first pressure regulator valve,
In, the third pneumatic operated valve is positioned close to the side of first pressure regulator valve, and the 6th pneumatic operated valve is positioned close to described
The side of first times of volume increasing device, the first pressure sensor are arranged where the third pneumatic operated valve and the 6th pneumatic operated valve
On access, between the third pneumatic operated valve and the 6th pneumatic operated valve, first reset valve is arranged in the 6th gas
Where dynamic valve and the third pneumatic operated valve in the first branch of access, the 4th pneumatic operated valve, institute are provided in the first branch
It states where the 4th pneumatic operated valve is located at the third pneumatic operated valve and the 6th pneumatic operated valve between access and first reset valve, institute
It states and is connected with the 8th pneumatic operated valve between first times of volume increasing device and first diffuser casing；
It is connected with the first pneumatic operated valve and the 5th pneumatic operated valve between second times of volume increasing device and second pressure regulator valve,
In, first pneumatic operated valve is positioned close to the side of second pressure regulator valve, and the 5th pneumatic operated valve is positioned close to described
The side of second times of volume increasing device, the second pressure sensor are arranged where the 5th pneumatic operated valve and first pneumatic operated valve
On access, between the 5th pneumatic operated valve and first pneumatic operated valve, second reset valve is arranged in the 5th gas
Where dynamic valve and first pneumatic operated valve in the second branch of access, the second pneumatic operated valve, institute are provided in the second branch
It states where the second pneumatic operated valve is located at first pneumatic operated valve and the 5th pneumatic operated valve between access and second reset valve, institute
It states and is connected with the 7th pneumatic operated valve between second times of volume increasing device and second diffuser casing.
In one embodiment, the pressurization injection pump and first times of volume increasing device and second times of volume increasing device it
Between be connected with the 9th pneumatic operated valve.
In one embodiment, above-mentioned gas diffusion measurement equipment further include: controller, it is pneumatic with described first respectively
Valve, second pneumatic operated valve, the third pneumatic operated valve, the 4th pneumatic operated valve, the 5th pneumatic operated valve, the described 6th are pneumatically
Valve, the 7th pneumatic operated valve, the 8th pneumatic operated valve are connected with the 9th pneumatic operated valve, for first pneumatic operated valve, institute
State the second pneumatic operated valve, the third pneumatic operated valve, the 4th pneumatic operated valve, the 5th pneumatic operated valve, the 6th pneumatic operated valve, described
The open and-shut mode and opening/closing time of 7th pneumatic operated valve, the 8th pneumatic operated valve and the 9th pneumatic operated valve are controlled.
In one embodiment, first pneumatic operated valve, second pneumatic operated valve, the third pneumatic operated valve, described
Four pneumatic operated valves, the 5th pneumatic operated valve, the 6th pneumatic operated valve, the 7th pneumatic operated valve, the 8th pneumatic operated valve and described
Nine pneumatic operated valves are stainless steel material.
In one embodiment, first times of volume increasing device includes: the first upper cavity and the first lower chamber, wherein the
The volume of one upper cavity is provided with connecting rod between first upper cavity and the first lower chamber less than the volume of the first lower chamber
The piston of connection, wherein for storing the gas for needing to be pressurized in first upper cavity, be used to deposit in first lower chamber
Water storage, in pressurization, the water in first lower chamber pushes connecting rod to move upwards to compress in first upper cavity
Gas；
Second times of volume increasing device includes: the second upper cavity and the second lower chamber, wherein the volume of the second upper cavity is less than
The volume of second lower chamber is provided with the piston of connecting rod connection, wherein institute between second upper cavity and the second lower chamber
The gas being pressurized in the second upper cavity for storing needs is stated, is used to store water in second lower chamber, in pressurization,
Water in second lower chamber pushes connecting rod to move upwards to compress the gas in second upper cavity.
Pass through the above-mentioned rock diffusion coefficient measurement being automatically injected based on micro-pressure-difference the embodiment of the invention also provides a kind of
Device carries out the rock diffusion coefficient measuring method being automatically injected based on micro-pressure-difference, comprising:
The first pressure regulator valve and the second pressure regulator valve are adjusted, control natural air-air source controls nitrogen to first times of volume increasing device gas injection
Gas source is to second times of volume increasing device gas injection；
Pressure phase in the pressure difference detected according to differential pressure pick-up, first times of volume increasing device and second times of volume increasing device
Big times volume increasing device is vented outwards automatically, until the pressure phase in first times of volume increasing device and second times of volume increasing device
Deng；
The gas controlled in first times of volume increasing device enters the first diffuser casing, controls the gas in second times of volume increasing device
Body enters the second diffuser casing；
Control is pressurized injection pump for first times of volume increasing device, first diffuser casing, second times of volume increasing device and institute
It states the gas in the second diffuser casing and synchronizes compression.
In one embodiment, injection pump is pressurized by first times of volume increasing device, first diffuser casing, institute in control
State during the gas in second times of volume increasing device and second diffuser casing synchronizes compression, further includes: control confining pressure with
Track pumps so that the pressure in the confining pressure of core holding unit and first diffuser casing and second diffuser casing is with scheduled pressure difference
Simultaneous growth.
In embodiments of the present invention, a kind of rock diffusion coefficient measurement device being automatically injected based on micro-pressure-difference is provided,
The device includes: natural air-air source, Nitrogen source gases, first times of volume increasing device, second times of volume increasing device, differential pressure pick-up, confining pressure tracking
Pump, pressurization injection pump, the first displacement transducer, second displacement transmitter and core holding unit, utilize same pressurization injection pump pair
The synchronous pressurization of two times of volume increasing devices, so that the pressure of two diffuser casings is equal, to achieve the purpose that balanced gas is spread, by above-mentioned
Mode solves in the prior art because caused by the presence of the pressure difference between two diffuser casings measurement result inaccuracy technology
Problem has reached the technical effect for effectively improving measurement result accuracy.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, not
Constitute limitation of the invention.In the accompanying drawings:
Fig. 1 is the structural schematic diagram of hydrocarbon gas diffusion coefficients equipment in existing rock；
Fig. 2 is the structure of the rock diffusion coefficient measurement device according to an embodiment of the present invention being automatically injected based on micro-pressure-difference
Schematic diagram；
Fig. 3 is the method for the rock diffusion coefficient measuring method according to an embodiment of the present invention being automatically injected based on micro-pressure-difference
Flow chart；
Fig. 4 is the another of the rock diffusion coefficient measurement device according to an embodiment of the present invention being automatically injected based on micro-pressure-difference
Structural schematic diagram.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, right below with reference to embodiment and attached drawing
The present invention is described in further details.Here, exemplary embodiment and its explanation of the invention is used to explain the present invention, but simultaneously
It is not as a limitation of the invention.
By in rock shown in FIG. 1 in hydrocarbon gas diffusion coefficients measuring apparatus rock when hydro carbons diffusion coefficient,
Generally by the way of pressure trapping gas injection, i.e., by manually controlling the speed and flow of air inlet, reach diffuser casing gas injection pressure
The pressure to needed for testing.The phenomenon that in order to solve the pressure imbalance of two diffuser casings caused by pressure trapping method of gas injection.
A kind of gas diffusivity sensing equipment is provided, which can replace the hand supercharging of original diffusion coefficients device
System reduces the increase of both sides pressure imbalance caused by due to artificial gas injection to guarantee the balance gas injection of two diffuser casings
Phenomenon, one end diffusion indoor gas influences a possibility that entering other side diffuser casing by pressure difference when reducing diffusion, ensure that reality
Test the accuracy of result.Meanwhile confining pressure tracking device is increased in hydrocarbon gas diffusion coefficients equipment in the rock, it encloses
Pressure can balance pressure according to gas injection and increase on the basis of guaranteeing the two pressure difference, avoid since pressure difference is excessive to lead set and sample
Product are damaged, ensure that equipment using safe.It may insure that experiment measures according to the improved experimental facilities of diffusion principle
Data are accurate, and to carry out Gas diffusion charging amount, windage evaluation provides scientific data and supports, grind to closed cap mechanism
Study carefully and be of great significance with gas sealingability evaluation, has a extensive future.
As shown in Fig. 2, for the rock diffusion coefficient measurement dress provided in an embodiment of the present invention being automatically injected based on micro-pressure-difference
Set schematic diagram, comprising:
Natural air-air source 1,2, first times of Nitrogen source gases, 7, second times of volume increasing device volume increasing device 8, differential pressure pick-up 9, confining pressure with
Track pump 11, pressurization injection pump 10, core holding unit 12, the first displacement transducer 13 and second displacement transmitter 14, wherein
Natural air-air source 1 is connected with first times of volume increasing device 7, is connected between natural air-air source 1 and first times of volume increasing device 7
First pressure regulator valve 3 of the flow and flow rate of control control gas；
Nitrogen source gases 2 are connected with second times of volume increasing device 8, are connected with control between Nitrogen source gases 2 and second times of volume increasing device 8
Control the second pressure regulator valve 4 of the flow and flow rate of gas；
Differential pressure pick-up 9 is connected between first times of volume increasing device 7 and second times of volume increasing device 8, for detecting first times of increase-volume
Pressure difference between device 7 and second times of volume increasing device 8；
One end that first times of volume increasing device 7 is connected with natural air-air source 1 is connected with the first diffuser casing, and the other end and pressurization are injected
Pump 10 is connected；
One end that second times of volume increasing device 8 is connected with Nitrogen source gases 2 is connected with the second diffuser casing, the other end and pressurization injection pump
10 are connected；
Confining pressure tracking pump 11 is connected with the core holding unit 12 between the first diffuser casing and the second diffuser casing；
First displacement transducer 13 is connected with the diffuser casing of 12 one end of core holding unit, second displacement transmitter 14 and rock core
The diffuser casing of 12 other end of clamper is connected, for carrying out flexible tune in the case where 12 pressure at two ends of core holding unit is different
It is whole.
Specifically, the bearing capacity of above-mentioned first times of volume increasing device 7 and second times of volume increasing device 8 may be greater than equal to 80MPa,
Heatproof is more than or equal to 220 DEG C, and the bearing capacity of above-mentioned differential pressure pick-up 9 can be more than or equal to 80MPa, precision 0.01MPa.
In view of in actual mechanical process, it is sometimes necessary to be finely adjusted to pressure, to paste pressure at both sides more
Closely or more close to target value, it can be arranged in above-mentioned gas diffusion measurement equipment: first pressure sensor, the first fine tuning
Valve, second pressure sensor and the second reset valve, wherein the first reset valve be connected in a manner of branch first times of volume increasing device and
Between first pressure regulator valve, the second reset valve is connected between second times of volume increasing device and the second pressure regulator valve in a manner of branch.
During actually measuring, in different phase, the open and-shut mode of each pipeline is to need to adjust as required
It is whole, for this purpose, the on-off of pipeline can be controlled using pneumatic operated valve, it in this example, can be in second times of volume increasing device and second
The first pneumatic operated valve and the 5th pneumatic operated valve are connected between pressure regulator valve, wherein the first pneumatic operated valve is positioned close to the one of the second pressure regulator valve
Side, the 5th pneumatic operated valve are positioned close to the side of second times of volume increasing device, and the setting of second pressure sensor is in the 5th pneumatic operated valve and the
On access where one pneumatic operated valve, positioned at the 5th pneumatic operated valve and first pneumatic operated valve between, the second reset valve is arranged the
Where five pneumatic operated valves and the first pneumatic operated valve in the second branch of access, the second pneumatic operated valve, the second gas are provided in second branch
Dynamic valve is located between the first pneumatic operated valve and the 5th pneumatic operated valve place access and the second reset valve, second times of volume increasing device and the second diffusion
The 7th pneumatic operated valve is connected between room；
Third pneumatic operated valve and the 6th pneumatic operated valve are connected between first times of volume increasing device and the first pressure regulator valve, wherein third
Pneumatic operated valve is positioned close to the side of the first pressure regulator valve, and the 6th pneumatic operated valve is positioned close to the side of first times of volume increasing device, and first
Pressure sensor setting on access, is being located at the third pneumatic operated valve and the described 6th where third pneumatic operated valve and the 6th pneumatic operated valve
Between pneumatic operated valve, where the 6th pneumatic operated valve and third pneumatic operated valve is arranged in the first reset valve in the first branch of access, first
Branch road is provided with the 4th pneumatic operated valve, access where the 4th pneumatic operated valve is located at third pneumatic operated valve and the 6th pneumatic operated valve and the first fine tuning
Between valve, the 8th pneumatic operated valve is connected between first times of volume increasing device and the first diffuser casing.Further, injection pump can also be pressurized
The 9th pneumatic operated valve is connected between first times of volume increasing device and second times of volume increasing device.
In order to realize the control of the on-off to above-mentioned pneumatic operated valve, a controller can be set, the controller is respectively with
One pneumatic operated valve, the second pneumatic operated valve, third pneumatic operated valve, the 4th pneumatic operated valve, the 5th pneumatic operated valve, the 6th pneumatic operated valve, the 7th pneumatic operated valve,
Eight pneumatic operated valves and the 9th pneumatic operated valve are connected, for the first pneumatic operated valve, the second pneumatic operated valve, third pneumatic operated valve, the 4th pneumatic operated valve, the
Open and-shut mode and the opening/closing time progress of five pneumatic operated valves, the 6th pneumatic operated valve, the 7th pneumatic operated valve, the 8th pneumatic operated valve and the 9th pneumatic operated valve
Control.
Above-mentioned first pneumatic operated valve, the second pneumatic operated valve, third pneumatic operated valve, the 4th pneumatic operated valve, the 5th pneumatic operated valve, the 6th are pneumatically
Valve, the 7th pneumatic operated valve, the 8th pneumatic operated valve and the 9th pneumatic operated valve can be stainless steel material.
Based on above-mentioned gas diffusivity sensing equipment, additionally provides in this example and a kind of to be automatically injected based on micro-pressure-difference
Rock diffusion coefficient measurement device, as shown in Figure 3, comprising the following steps:
Step 301: adjust the first pressure regulator valve and the second pressure regulator valve, control natural air-air source to first times of volume increasing device gas injection,
Nitrogen source gases are controlled to second times of volume increasing device gas injection；
Step 302: pressure phase in the pressure difference detected according to differential pressure pick-up, first times of volume increasing device and second times of volume increasing device
Big times volume increasing device is vented outwards automatically, until the pressure in first times of volume increasing device and second times of volume increasing device is equal；
Step 303: the gas in first times of volume increasing device of control enters the first diffuser casing, controls the gas in second times of volume increasing device
Body enters the second diffuser casing；
Step 304: control pressurization injection pump expands first times of volume increasing device, the first diffuser casing, second times of volume increasing device and second
The gas dissipated in room synchronizes compression.
Further, while gas injection tracking device is increased, confining pressure can balance pressure according to gas injection and guarantee the two pressure difference
On the basis of increase, avoid damaging lead set and sample since pressure difference is excessive, guarantee equipment using safe.That is,
Confining pressure tracking pump be can control so that the confining pressure of core holding unit and the pressure in first diffuser casing and second diffuser casing
Power is grown simultaneously with scheduled pressure difference.
When specific implementation, above-mentioned first times of volume increasing device may include: the first upper cavity and the first lower chamber, wherein
Volume of the volume of first upper cavity less than the first lower chamber, the company of being provided between first upper cavity and the first lower chamber
The piston of bar connection, wherein for storing the gas for needing to be pressurized in first upper cavity, be used in first lower chamber
Water is stored, in pressurization, the water in first lower chamber pushes connecting rod to move upwards to compress first upper cavity
In gas；Above-mentioned second times of volume increasing device may include: the second upper cavity and the second lower chamber, wherein the appearance of the second upper cavity
Product is provided with the piston of connecting rod connection less than the volume of the second lower chamber between second upper cavity and the second lower chamber,
Wherein, it is used to store water in second lower chamber, be pressurized for storing the gas for needing to be pressurized in second upper cavity
In the process, the water in second lower chamber pushes connecting rod to move upwards to compress the gas in second upper cavity.
Below with reference to a specific embodiment to the above-mentioned rock diffusion coefficient measurement device being automatically injected based on micro-pressure-difference and
Method is specifically described, it should be noted, however, that the specific embodiment is merely to be better described the present invention, not
Constitute inappropriate limitation of the present invention.
As shown in figure 4, including: natural air-air source 1, nitrogen based on the rock diffusion coefficient measurement device that micro-pressure-difference is automatically injected
Gas gas source 2, the first pressure regulator valve 3, the second pressure regulator valve 4, the first reset valve 5,6, first times of the second reset valve, 7, second times of volume increasing device
Volume increasing device 8, differential pressure pick-up 9, pressurization injection pump 10, confining pressure tracking pump 11, core holding unit 12,13 and of the first displacement transducer
Second displacement transmitter 14.
Wherein, gas source (natural air-air source 1 and Nitrogen source gases 2) is connected with two times of volume increasing devices respectively, is connecting respectively
By the connectivity of both pneumatic operated valve control on pipeline, pressure regulator valve (the first pressure regulator valve 3 and the are equipped between pneumatic operated valve and gas source
Two pressure regulator valves 4) control gas flow and flow rate；Pressure sensor and reset valve be both connected to pressure regulator valve and times volume increasing device it
Between, the gas pressure of times volume increasing device is adjusted in a manner of slowly deflating, times volume increasing device is respectively at the left and right of diffusion device two
A diffuser casing is connected, and is pressurized for two diffuser casing inner equilibriums, and differential pressure pick-up both ends are connected with twice of volume increasing device respectively, with inspection
The pressure difference of two times of volume increasing devices is surveyed, pressurization injection pump is connected with two times of volume increasing devices respectively, and pneumatic operated valve is equipped in connecting pipeline
Come the connectivity both controlled, confining pressure tracking pump is connected with the core holding unit of diffusion device, displacement transducer and rock
Heart clamp holder both ends are connected, if detecting that diffusion both ends gas pressure is inconsistent, can carry out flexible fine tuning, make both ends gas
It rebalances.
Above-mentioned times of volume increasing device, pressure regulator valve, reset valve and pressure sensor can be respectively set two sets, a set of natural air-air source
It is connected, it is a set of to be connected with Nitrogen source gases.
Specifically, above-mentioned times of volume increasing device and diffuser casing are high-temperature and high-presure resistent container, and bearing capacity is not less than 80MPa,
Temperature tolerance is not less than 220 DEG C, and core holding unit bearing capacity is not less than 100MPa, and temperature tolerance is not less than 220 DEG C, each connecting pipeline
It is stainless steel material with the equal high temperature high voltage resistant of valve, the pressure resistance of differential pressure pick-up and display table can be set to 80MPa, precision
It can be 0.01MPa.
Two times of volume increasing devices being connected with diffuser casing can be filled by above-mentioned gas diffusion coefficients equipment same
The gas of pressure, and pressurization is synchronized to two times of volume increasing devices using same booster pump, so that the pressure of two diffuser casings is equal,
To achieve the purpose that balanced gas is spread.Confining pressure tracing mode is added simultaneously to protect the experimental provision and sample under high temperature and pressure
Product.Above-mentioned gas diffusion coefficients equipment can carry out automatic operation to the whole process of diffusion injection, reduce manual operation
Error.
First times of volume increasing device 7 and second times of volume increasing device 8 can work according to following principle: it is made of upper and lower two cavitys,
Wherein, top is small cavity, and lower part is large cavity, is therebetween the piston of connecting rod connection, needs to be pressurized in small cavity
Gas, interior large cavity is water, and under the work of booster pump, the water of lower part pushes connecting rod to move upwards, so that upper gas is compressed,
The ratio between the floor space of size cavity can be set to 3.6:1, under booster pump same case, relative to the identical work of upper and lower area
Fill in pumping rate faster.Meanwhile can choose the compressed coefficient is higher, the higher booster pump of pump volume with reach pressurization require, such as
Fruit booster pump runs to the still not up to required pressure of final position, then can open V10, new pressurization of laying equal stress on of intaking again, if again
Volume increasing device piston, which outreaches, is still not up to required pressure, then closes V7, V8, be again turned on V5, V6 and restart to increase-volume again
The process of device gas injection.
Gas diffusion sensing equipment as shown in Figure 4 can connect in accordance with the following methods:
1) gas source 1 and 2 is connected with two times of volume increasing devices 7 and 8 respectively, is controlled in connecting pipeline by pneumatic operated valve respectively
The connectivity of the two, and the flow and flow rate equipped with the pressure regulator valve 3 and 4 control gas between pneumatic operated valve and gas source；
2) pressure sensor and reset valve 5 and 6 are both connected between pressure regulator valve 3 and 4 and again volume increasing device 7 and 8；
3) times volume increasing device 7 and 8 is connected respectively at the diffuser casing of the left and right of diffusion device two；
4) 9 both ends of differential pressure pick-up are connected with twice of volume increasing device 7 and 8 respectively, to detect the pressure of two times of volume increasing devices 7 and 8
Difference；
5) pressurization injection pump 10 is connected with two times of volume increasing devices 7 and 8 respectively, is equipped with pneumatic operated valve in connecting pipeline to control
The connectivity of the two；
6) confining pressure tracking pump 11 is connected with the core holding unit 12 of diffusion device；
7) the first displacement transducer 13 and second displacement transmitter 14 are connected with 12 left and right ends of core holding unit respectively.
Above-mentioned gas diffusion coefficients equipment can be operated as follows, may include:
S1: vacuum pumping is carried out to whole device, subsequent control valve is all in closed state；
S2: opening V1, V3, V5, V6, closes V2, V4, V7, V8, V9, V10, adjusts pressure regulator valve 1 and pressure regulator valve 2, both ends gas
Source gas injection into volume increasing device again is less than or equal to gas pressure and tests required gas injection balance pressure, guarantees two as far as possible
The container pressure that doubles is close；
S3: opening air inlet in operating system and finely tune mode, and V1, V3 is automatically closed in system, opens V2, V4, is passed according to differential pressure
The pressure difference that sensor detects, the big one end of pressure are emptied automatically by reset valve with slow speed outward, finally make two times
Pressure in volume increasing device is equal；
S4: opening gas injection mode, and V2, V4, V5, V6 is automatically closed in system, opens V7, V8, two multiplication gas in container
Evenly enter in two diffuser casings of diffusion device under the action of pressure difference；
S5: opening boost mode, and system automatically opens V9 and confining pressure tracking pump related valve, is pressurized injection pump for times increase-volume
In device and the indoor synchronic gas of diffusion compresses, and is pressurized both ends gas without pressure difference, pressure balance increases.Tracking is opened simultaneously
Mode, confining pressure tracking pump the pressure of traceable diffuser casing, and with the simultaneous growth of the pressure difference of setting, to protect lead set and sample.Such as
Fruit booster pump runs to the still not up to required pressure of final position, then opens V10, new pressurization of laying equal stress on of intaking again, if multiplication
Container plunger, which outreaches, is still not up to required pressure, then closes V7, V8, be again turned on V5, V6, restart to volume increasing device again
The process of gas injection.
It can guarantee gas injection process by above-mentioned gas diffusion coefficients equipment and gas diffusion coefficients method
Balance avoids manual operation bring error, reduces the phenomenon of diffusion coefficient inaccuracy caused by due to pressure difference, meanwhile,
Gas injection tracking device is increased, confining pressure can balance pressure according to gas injection and increase on the basis of guaranteeing the two pressure difference, avoid
Damaged caused by lead set and sample since pressure difference is excessive, ensure that equipment using safe.That is, to being connected with diffuser casing
Two times of volume increasing devices fill the gas of same pressure, and using same booster pump to the synchronous pressurization of two times of volume increasing devices, so that two
The pressure of diffuser casing is equal, to achieve the purpose that balanced gas is spread.It is added under confining pressure tracing mode protection high temperature and pressure simultaneously
Experimental provision and sample.Above-mentioned gas diffusion coefficients equipment can carry out automation behaviour to the whole process of diffusion injection
Make, reduces manually-operated error.
It can be seen from the above description that the embodiment of the present invention realizes following technical effect: providing one kind and be based on
The rock diffusion coefficient measurement device that micro-pressure-difference is automatically injected, the device include: natural air-air source, Nitrogen source gases, the first multiplication
Container, second times of volume increasing device, differential pressure pick-up, confining pressure tracking pump, pressurization injection pump, the first displacement transducer, second displacement become
Device and core holding unit are sent, using same pressurization injection pump to the synchronous pressurization of two times of volume increasing devices, so that the pressure of two diffuser casings
It is equal, to achieve the purpose that balanced gas is spread, solve through the above way in the prior art, because between two diffuser casings
The technical problem of measurement result inaccuracy, has reached the technology for effectively improving measurement result accuracy caused by the presence of pressure difference
Effect.
Obviously, those skilled in the art should be understood that each module of the above-mentioned embodiment of the present invention or each step can be with
It is realized with general computing device, they can be concentrated on a single computing device, or be distributed in multiple computing devices
On composed network, optionally, they can be realized with the program code that computing device can perform, it is thus possible to by it
Store and be performed by computing device in the storage device, and in some cases, can be held with the sequence for being different from herein
The shown or described step of row, perhaps they are fabricated to each integrated circuit modules or will be multiple in them
Module or step are fabricated to single integrated circuit module to realize.In this way, the embodiment of the present invention be not limited to it is any specific hard
Part and software combine.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the embodiment of the present invention can have various modifications and variations.All within the spirits and principles of the present invention, made
Any modification, equivalent substitution, improvement and etc. should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of rock diffusion coefficient measurement device being automatically injected based on micro-pressure-difference characterized by comprising natural gas gas
Source, Nitrogen source gases, first times of volume increasing device, second times of volume increasing device, differential pressure pick-up, confining pressure tracking pump, pressurization injection pump, first
Move transmitter, second displacement transmitter, core holding unit, first pressure sensor, second pressure sensor, the first reset valve and
Second reset valve, wherein
The natural air-air source is connected with first times of volume increasing device, the natural air-air source and first times of volume increasing device it
Between be connected with control control gas flow and flow rate the first pressure regulator valve；
The Nitrogen source gases are connected with second times of volume increasing device, connect between the Nitrogen source gases and second times of volume increasing device
It is connected to the second pressure regulator valve of the flow and flow rate of control control gas；
The differential pressure pick-up is connected between first times of volume increasing device and second times of volume increasing device, described for detecting
Pressure difference between first times of volume increasing device and second times of volume increasing device；
One end that first times of volume increasing device is connected with the natural air-air source is connected with the first diffuser casing, the other end and the increasing
Injection pump is pressed to be connected；
One end that second times of volume increasing device is connected with the Nitrogen source gases is connected with the second diffuser casing, the other end and the pressurization
Injection pump is connected；
The confining pressure tracking pump is connected with the core holding unit between first diffuser casing and second diffuser casing；
First displacement transducer is connected with first diffuser casing, the second displacement transmitter and second diffuser casing
It is connected, for carrying out flexible adjustment in the case where core holding unit both ends diffusion gas pressure inside is different；
Wherein, it is connected with third pneumatic operated valve and the 6th pneumatic operated valve between first times of volume increasing device and first pressure regulator valve,
Wherein, the third pneumatic operated valve is positioned close to the side of first pressure regulator valve, and the 6th pneumatic operated valve is positioned close to institute
The side of first times of volume increasing device is stated, the first pressure sensor is arranged in the third pneumatic operated valve and the 6th pneumatic operated valve institute
On access, between the third pneumatic operated valve and the 6th pneumatic operated valve, first reset valve is arranged the described 6th
Where pneumatic operated valve and the third pneumatic operated valve in the first branch of access, the 4th pneumatic operated valve is provided in the first branch,
Where 4th pneumatic operated valve is located at the third pneumatic operated valve and the 6th pneumatic operated valve between access and first reset valve,
The 8th pneumatic operated valve is connected between first times of volume increasing device and first diffuser casing；
The first pneumatic operated valve and the 5th pneumatic operated valve are connected between second times of volume increasing device and second pressure regulator valve, wherein
First pneumatic operated valve is positioned close to the side of second pressure regulator valve, and the 5th pneumatic operated valve is positioned close to described second
The side of times volume increasing device, the second pressure sensor are arranged in access where the 5th pneumatic operated valve and first pneumatic operated valve
On, between the 5th pneumatic operated valve and first pneumatic operated valve, second reset valve is arranged in the 5th pneumatic operated valve
In the second branch of access where first pneumatic operated valve, it is provided with the second pneumatic operated valve in the second branch, described the
Where two pneumatic operated valves are located at first pneumatic operated valve and the 5th pneumatic operated valve between access and second reset valve, described the
The 7th pneumatic operated valve is connected between two times of volume increasing devices and second diffuser casing.
2. the rock diffusion coefficient measurement device according to claim 1 being automatically injected based on micro-pressure-difference, which is characterized in that
The bearing capacity of first times of volume increasing device and second times of volume increasing device is more than or equal to 80MPa, and heatproof is more than or equal to 220 DEG C.
3. the rock diffusion coefficient measurement device according to claim 1 being automatically injected based on micro-pressure-difference, which is characterized in that
The bearing capacity of the differential pressure pick-up is more than or equal to 80MPa, precision 0.01MPa.
4. the rock diffusion coefficient measurement device according to claim 1 being automatically injected based on micro-pressure-difference, which is characterized in that
Further include: first pressure sensor, the first reset valve, second pressure sensor and the second reset valve, wherein
First reset valve is connected between first times of volume increasing device and first pressure regulator valve in a manner of branch；
Second reset valve is connected between second times of volume increasing device and second pressure regulator valve in a manner of branch.
5. the rock diffusion coefficient measurement device according to claim 1 being automatically injected based on micro-pressure-difference, which is characterized in that
The 9th pneumatic operated valve is connected between the pressurization injection pump and first times of volume increasing device and second times of volume increasing device.
6. the rock diffusion coefficient measurement device according to claim 5 being automatically injected based on micro-pressure-difference, which is characterized in that
Further include:
Controller, respectively with first pneumatic operated valve, second pneumatic operated valve, the third pneumatic operated valve, the 4th pneumatic operated valve,
5th pneumatic operated valve, the 6th pneumatic operated valve, the 7th pneumatic operated valve, the 8th pneumatic operated valve and the 9th pneumatic operated valve phase
Even, for first pneumatic operated valve, second pneumatic operated valve, the third pneumatic operated valve, the 4th pneumatic operated valve, the described 5th
Pneumatic operated valve, the 6th pneumatic operated valve, the 7th pneumatic operated valve, the 8th pneumatic operated valve and the 9th pneumatic operated valve open and-shut mode
It is controlled with opening/closing time.
7. the rock diffusion coefficient measurement device according to any one of claim 1 to 6 being automatically injected based on micro-pressure-difference,
It is characterized in that, first times of volume increasing device includes: the first upper cavity and the first lower chamber, wherein the volume of the first upper cavity
Less than the volume of the first lower chamber, the piston of connecting rod connection is provided between first upper cavity and the first lower chamber,
In, for storing the gas for needing to be pressurized in first upper cavity, it is used to store water in first lower chamber, had been pressurized
Cheng Zhong, the water in first lower chamber push connecting rod to move upwards to compress the gas in first upper cavity；
Second times of volume increasing device includes: the second upper cavity and the second lower chamber, wherein the volume of the second upper cavity is less than second
The volume of lower chamber is provided with the piston of connecting rod connection between second upper cavity and the second lower chamber, wherein described the
It is used to store the gas for needing to be pressurized in two upper cavities, is used to store water in second lower chamber, it is described in pressurization
Water in second lower chamber pushes connecting rod to move upwards to compress the gas in second upper cavity.
8. a kind of by being measured described in any one of claims 1 to 7 based on the rock diffusion coefficient that micro-pressure-difference is automatically injected
Device carries out the rock diffusion coefficient measuring method being automatically injected based on micro-pressure-difference characterized by comprising
The first pressure regulator valve and the second pressure regulator valve are adjusted, control natural air-air source controls Nitrogen source gases to first times of volume increasing device gas injection
To second times of volume increasing device gas injection；
Pressure is relatively large in the pressure difference detected according to differential pressure pick-up, first times of volume increasing device and second times of volume increasing device
A times volume increasing device be vented outwards automatically, until first times of volume increasing device and second times of volume increasing device in pressure it is equal；
Control gas in first times of volume increasing device and enter the first diffuser casing, control gas in second times of volume increasing device into
Enter the second diffuser casing；
Control pressurization injection pump is by first times of volume increasing device, first diffuser casing, second times of volume increasing device and described the
Gas in two diffuser casings synchronizes compression.
9. according to the method described in claim 8, it is characterized in that, control pressurization injection pump by first times of volume increasing device,
During gas in first diffuser casing, second times of volume increasing device and second diffuser casing synchronizes compression,
The method also includes:
Confining pressure tracking pump is controlled so that core holding unit confining pressure and the pressure in first diffuser casing and second diffuser casing
With the simultaneous growth of scheduled pressure difference.
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| CN107345892B9 (en) * | 2017-05-16 | 2024-02-02 | 浙江工业大学 | Method and device for measuring oxygen diffusion coefficients of cement-based materials in different exposure environments |
| CN109100088A (en) * | 2018-10-11 | 2018-12-28 | 九牧厨卫股份有限公司 | A kind of detection method and its detection device of floor drain deodorization performance |
| CN110426321B (en) * | 2019-07-24 | 2021-01-05 | 西南石油大学 | Experimental device for measuring diffusion coefficient of natural gas |
| CN111351738B (en) * | 2019-12-06 | 2022-06-28 | 太原理工大学 | Natural gas diffusion coefficient analogue test apparatus |
| CN111077044A (en) * | 2019-12-28 | 2020-04-28 | 西南石油大学 | Natural gas diffusion coefficient measuring device |
| CN112763140B (en) * | 2020-12-23 | 2021-08-27 | 重庆科技学院 | Dynamic sealing performance evaluation method for oil reservoir type gas storage cover layer |
| CN112858108B (en) * | 2021-03-12 | 2023-01-10 | 中国石油大学(华东) | Convection and diffusion experimental device and method for variable sample cavity under temperature and pressure conditions |
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