CN106018745B - Gas well is measured to shake out the device and method of critical gas flow velocity - Google Patents
Gas well is measured to shake out the device and method of critical gas flow velocity Download PDFInfo
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- CN106018745B CN106018745B CN201610454775.5A CN201610454775A CN106018745B CN 106018745 B CN106018745 B CN 106018745B CN 201610454775 A CN201610454775 A CN 201610454775A CN 106018745 B CN106018745 B CN 106018745B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
Abstract
The present invention provides a kind of measurement gas well and shakes out the device and method of critical gas flow velocity.The gas well provided by the invention that measures shakes out the device of critical gas flow velocity, including：Core clamping device, gas supply device, inlet pressure regulating device, sand preparation plant, measurement and data collecting system.The gas well provided by the invention that measures shakes out the device and method of critical gas flow velocity, more actually simulates process of the gas reservoir gas by gas recovery well, can be used for measuring gas well and shake out critical gas flow velocity, and accuracy is higher.In addition, the gas well provided by the invention that measures shakes out the device and method of critical gas flow velocity, additionally it is possible to shake out critical gas flow velocity for measuring the gas well under high pressure conditions, applicability is wider.
Description
Technical field
The present invention relates to oil gas well mining technology more particularly to it is a kind of measure gas well shake out critical gas flow velocity device and
Method.
Background technology
Unconsolidated fine siltstone is easy to shake out in recovery process.Gas well shake out after easily cause cave-in, casing damage,
The problems such as formation damage or even sand bury payzone；Meanwhile gas well shakes out and can also cause to wear to ground installation, production flow line and stifled
Plug.Influence gas well shakes out many because being known as, wherein the flow velocity of gas is the key factor for influencing to shake out.For sandstone reservoirs,
It shakes out critical gas flow velocity generally there are gas well, i.e., when gas flow rate is more than critical gas flow velocity, sandstone structure is destroyed,
Cause to shake out.Therefore, it measures gas well to shake out critical gas flow velocity, for formulating rational working system, the suitable completion of selection
The work such as mode and anti-sand method are all particularly significant.
Currently, generally calculating critical gas flow velocity by mathematical model.However, the critical gas calculated using mathematical model
Body flow velocity, accuracy cannot be guaranteed.
Invention content
The present invention provides a kind of measurement gas well and shakes out the device and method of critical gas flow velocity, to solve to use mathematical model
Calculate gas well shake out critical gas flow velocity when, the not high problem of accuracy.
One aspect of the present invention provides a kind of measurement gas well and shakes out the device of critical gas flow velocity.Measurement gas provided by the invention
Well shakes out the device of critical gas flow velocity, including：Core clamping device, gas supply device, inlet pressure regulating device, Sha Chu
Manage device, measurement and data collecting system；Wherein：
Above-mentioned core clamping device, including confining pressure pump and pressing device, above-mentioned confining pressure pump, for being carried to above-mentioned pressing device
For confining pressure, so that above-mentioned pressing device compresses the rock core for being taken from gas well reservoir to be measured；
Above-mentioned gas feed system, for providing air source to above-mentioned rock core；
Above-mentioned inlet pressure regulating device is arranged between above-mentioned gas feedway and above-mentioned core clamping device, uses
In the gas pressure for adjusting above-mentioned rock core entrance；
Above-mentioned sand preparation plant is arranged after above-mentioned core clamping device, the sand for collecting above-mentioned rock core output, and
The sand of above-mentioned output is cleaned, drying and processing；
Above-mentioned measurement and data collecting system, for measuring the gas pressure of above-mentioned rock core entrance, the gas in exit
The quality of pressure, the throughput of rock core outlet end gas and rock core output sand, acquisition inlet pressure, exit pressure levels, gas
The mass value of flow value and output sand, and be more than according to the quality of output sand and the ratio of the throughput of rock core outlet end gas
The air flow value of rock core outlet end gas when predetermined threshold value obtains the critical gas flow velocity that gas well to be measured shakes out.
Further, the measurement gas well that one embodiment of the invention provides shakes out the device of critical gas flow velocity, further includes：Go out
Mouth pressure-regulating device,
Above-mentioned outlet pressure regulating device is arranged after above-mentioned sand preparation plant, for adjusting above-mentioned rock core exit
Gas pressure.
Further, the measurement gas well that one embodiment of the invention provides shakes out the device of critical gas flow velocity, above-mentioned outlet
Pressure-regulating device, including：Back-pressure valve and backpressure pump；
Above-mentioned backpressure pump is connect with above-mentioned back-pressure valve, and above-mentioned back-pressure valve is connect with above-mentioned sand preparation plant.
Further, the measurement gas well that one embodiment of the invention provides shakes out the device of critical gas flow velocity, above-mentioned gas
Feedway is gas cylinder.
Further, the measurement gas well that one embodiment of the invention provides shakes out the device of critical gas flow velocity, above-mentioned import
Pressure-regulating device, including：Regulating valve and booster pump；
Above-mentioned regulating valve is connected with above-mentioned booster pump, and one end of above-mentioned regulating valve is connect with above-mentioned gas feedway, on
The one end for stating booster pump is connect with above-mentioned core clamping device.
Further, the measurement gas well that one embodiment of the invention provides shakes out the device of critical gas flow velocity, at above-mentioned sand
Device is managed, including：Filter, washer, baker；
Above-mentioned filter is connect with above-mentioned core clamping device, the sand for collecting above-mentioned rock core output；
Above-mentioned washer and above-mentioned baker are respectively used to clean the sand of above-mentioned output, drying and processing.
Further, the measurement gas well that one embodiment of the invention provides shakes out the device of critical gas flow velocity, above-mentioned measurement
Include with data collecting system：Inlet pressure sensor, outlet pressure sensor, flowmeter, mass measurement meter, data acquisition
Device；
Above-mentioned inlet pressure sensor is arranged in above-mentioned pressing device input end, the gas pressure for measuring rock core entrance
Power；
Above-mentioned outlet pressure sensor is arranged in above-mentioned pressing device outlet end, the pressure for measuring rock core exit；
Above-mentioned flowmeter is arranged after above-mentioned sand preparation plant, the air-flow for measuring above-mentioned rock core outlet end gas
Amount；
Above-mentioned mass measurement meter, the quality for measuring above-mentioned rock core output sand；
Above-mentioned data collector, respectively with above-mentioned inlet pressure sensor, above-mentioned outlet pressure sensor, above-mentioned flow
Meter, the connection of above-mentioned mass measurement meter, the quality for acquiring inlet pressure, exit pressure levels, air flow value and output sand
Value, and rock core outlet end when being more than according to the ratio of the quality of output sand and the throughput of rock core outlet end gas predetermined threshold value
The air flow value of gas obtains the critical gas flow velocity that gas well to be measured shakes out.
Further, the gas well that one embodiment of the invention provides shakes out the device of critical gas flow velocity, above-mentioned inlet pressure
Regulating device further includes：Buffer unit；
Above-mentioned buffer unit is arranged after above-mentioned booster pump, the gas pressure for stablizing rock core entrance.
Another aspect of the present invention provides a kind of measurement gas well and shakes out the method for critical gas flow velocity.Measurement provided by the invention
Gas well shakes out the method for critical gas flow velocity, includes the following steps：
Step 1：The rock core for being taken from gas well reservoir to be measured is clamped in pressing device using confining pressure；
Step 2：Air source is provided to above-mentioned rock core；The gas pressure of above-mentioned rock core entrance is adjusted to setting value；
Step 3：Measure the gas pressure of above-mentioned rock core entrance, the gas pressure in exit and the outlet of above-mentioned rock core
The throughput of gas is held, and acquires inlet pressure, exit pressure levels, air flow value；
Step 4：After preset time, stops providing air source to above-mentioned rock core, collect the sand of above-mentioned rock core output, and
The sand of above-mentioned output is cleaned, drying and processing, measure the quality of above-mentioned rock core output sand, and acquires the matter of above-mentioned output sand
Magnitude；
Step 5：The setting value for increasing rock core entrance gas pressure repeats step 2 to step 4, up to output sand
When the ratio of quality and the throughput of rock core outlet end gas is more than predetermined threshold value, stop experiment；
Step 6：When according to the ratio of the quality of output sand and the throughput of rock core outlet end gas more than predetermined threshold value
The air flow value of rock core outlet end gas calculates the critical gas flow velocity that above-mentioned rock core shakes out, the critical gas that above-mentioned rock core shakes out
Body flow velocity and gas well to be measured the critical gas flow velocity that shakes out are equal, obtain the critical gas flow velocity that gas well to be measured shakes out.
Further, the measurement gas well that one embodiment of the invention provides shakes out the method for critical gas flow velocity, above-mentioned steps
Before three, further include：
The gas pressure in above-mentioned rock core exit is adjusted to setting value；
Above-mentioned steps five include：When increasing the setting value of rock core entrance gas pressure, increase rock core exit gas
The setting value of pressure makes rock core pressure difference maintain within a preset range.
The gas well provided by the invention that measures shakes out the device and method of critical gas flow velocity, more actually simulates gas of gas reservoir
Body can be used for measuring gas well and shake out critical gas flow velocity, and accuracy is higher by the process of gas recovery well.In addition, this hair
The measurement gas well of bright offer shakes out the device and method of critical gas flow velocity, additionally it is possible to go out for measuring the gas well under high pressure conditions
Sand critical gas flow velocity, applicability are wider.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Some bright embodiments for those of ordinary skill in the art without having to pay creative labor, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 be the present invention measure gas well shake out critical gas flow velocity device embodiment one structural schematic diagram；
Fig. 2 be the present invention measure gas well shake out critical gas flow velocity embodiment of the method one flow chart；
Fig. 3 be the present invention measure gas well shake out critical gas flow velocity device embodiment two structural schematic diagram；
Fig. 4 be the present invention measure gas well shake out critical gas flow velocity embodiment of the method two flow chart.
Reference sign：
1：Core clamping device；
2：Gas supply device；
3：Inlet pressure regulating device；
4：Sand preparation plant；
5：Measurement and data collecting system；
6：Outlet pressure regulating device；
11：Confining pressure pumps；
12：Pressing device；
31：Pressure regulator valve；
32：Booster pump；
33：Buffer unit；
41：Filter；
42：Washer and baker；
51：Inlet pressure sensor；
52：Outlet pressure sensor；
53：Flowmeter；
54：Mass measurement meter；
55：Data collector；
61：Back-pressure valve；
62：Backpressure pump.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
The every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
The present invention provides a kind of measurement gas well and shakes out the device and method of critical gas flow velocity, to solve in the prior art
Using mathematical model calculate gas well shake out critical gas flow velocity when, the not high problem of accuracy.
Embodiment one
Fig. 1 be the present invention measure gas well shake out critical gas flow velocity device embodiment one structural schematic diagram.It please refers to
Fig. 1, the gas well provided in this embodiment that measures shake out the device of critical gas flow velocity, including：Core clamping device 1, gas supply
Device 2, inlet pressure regulating device 3, sand preparation plant 4, measurement and data collecting system 5；Wherein：
Core clamping device 1, including confining pressure pump 11 and pressing device 12, confining pressure pump 11, for being provided to pressing device 12
Confining pressure, so that pressing device 12 compresses the rock core for being taken from gas well reservoir to be measured.
Specifically, the rock core for being taken from gas well reservoir to be measured is standard rock core, is led to gas on the rock core axial direction
Road.
More specifically, pressing device 12 can be the ring-shaped rubber casing with rock core equal length；Either, long with rock core
Spend equal annular copper pipe.The diameter of gum sleeve or copper pipe is slightly larger than the diameter of rock core.Rock core is placed in pressing device 12
When, there are gaps between rock core outer wall and pressing device 12.At this point, confining pressure pump 11 can be enclosed to gum sleeve or copper pipe offer
Pressure so that gum sleeve or copper pipe are in close contact with rock core outer wall, and then rock core is compressed.It should be noted that not right herein
The confining pressure value that confining pressure pump provides is defined, and rock core can be closely clamped in pressure by the confining pressure value that confining pressure pump provides with the confining pressure value
Subject in tight device.
Gas supply system 2, for providing air source to rock core.
Specifically, gas supply system 2, for providing air source to rock core, in this way, gas passes through on rock core axial direction
Gas passage passes through rock core.To simulate in gas well, gas reservoir gas passes through the process of gas production pit shaft.More specifically, gas supply system
System can be air accumulator, gas cylinder etc., preferably gas cylinder.
Inlet pressure regulating device 3 is arranged between gas supply device 2 and core clamping device 1, for adjusting rock core
The gas pressure of entrance.
Specifically, measure gas well shake out critical gas flow velocity during, can by inlet pressure regulating device come
The gas pressure for adjusting rock core entrance more accurately measures gas well and shakes out to allow the gas of specific different pressures by rock core
Critical gas flow velocity.For example, in continuous mode, first by the sufficiently small of the gas pressure of rock core entrance adjusting, pass through sand
Whether processing unit observation rock core shakes out, then gradually increases the gas pressure of rock core entrance, to measure when outlet well is shaked out
Critical gas flow velocity.
More specifically, inlet pressure regulating device 3, including：Pressure regulator valve 31 and booster pump 32, regulating valve 31 and booster pump 32
Connection, one end of regulating valve 31 are connect with gas supply device 2, and one end of booster pump 32 is connect with core clamping device 1.Its
In, more specifically, one end of booster pump 32 is connect with pressing device 12.
Further, the gas well provided in this embodiment that measures shakes out the device of critical gas flow velocity, and inlet pressure adjusts dress
3 are set, further includes：Buffer unit 33, buffer unit 33 are arranged after booster pump 32, the gas for stablizing rock core entrance
Pressure.Specifically, buffer unit 33 can be a buffer container.
Sand preparation plant 4 is arranged after core clamping device 1, the sand for collecting rock core output, and to the sand of output
It is cleaned, drying and processing；
Specifically, when gas supply device 2 provide air source flow velocity reach gas well shake out critical gas flow velocity when, rock core
It will shake out.At this point, the sand of rock core output is collected using the sand preparation plant 4 being arranged after core clamping device 1, and to sand
It is cleaned, drying and processing.
More specifically, sand preparation plant 4, including：Filter 41, washer and baker 42, filter 41 are specifically arranged
After pressing device 12, the sand for collecting rock core output；Washer and baker 42, then be respectively used to the sand of output into
Row cleaning, drying and processing.
Measurement and data collecting system 5, for measuring the gas pressure of rock core entrance, the gas pressure in exit, rock
The throughput of heart outlet end gas and the quality of rock core output sand, acquisition inlet pressure, exit pressure levels, air flow value with
And the mass value of output sand, and predetermined threshold value is more than according to the ratio of the quality of output sand and the throughput of rock core outlet end gas
When rock core outlet end gas air flow value, obtain the critical gas flow velocity that gas well to be measured shakes out.
Specifically, predetermined threshold value 0.001g/m3, it is specified that the quality of output sand and the throughput of rock core outlet end gas
Ratio is more than 0.001g/m3When, corresponding air flow value is the critical gas flows magnitude that rock core shakes out.At this point, according to throughput
Value, in conjunction with the dimensional parameters of rock core, can obtain the corresponding critical gas flow rate that shakes out.
More specifically, measurement and data collecting system 5, including：Inlet pressure sensor 51, outlet pressure sensor
52, flowmeter 53, mass measurement meter 54, data collector 55.Wherein, inlet pressure sensor 51 setting pressing device 12 into
Mouth end, the gas pressure for measuring rock core entrance；Outlet pressure sensor 52 is arranged in 12 outlet end of pressing device, is used for
Measure the gas pressure in rock core exit；Flowmeter 53 is arranged after sand preparation plant 4, for measuring rock core outlet end gas
Throughput；Mass measurement meter 54 then is used to measure the quality of rock core output sand.It should be noted that mass measurement meter is preferred
For electronic balance.
Data collector 55 is surveyed with inlet pressure sensor 51, outlet pressure sensor 52, flowmeter 53, quality respectively
Gauge 54 connects, the rock core entrance gas pressure value for acquiring the measurement of inlet pressure sensor 51, outlet pressure sensor
The gas pressure value in the 52 rock core exits measured, the air flow value for the rock core outlet end gas that flowmeter 53 measures, quality are surveyed
The quality for the output sand that gauge 54 measures.
It should be noted that data collector 55, is additionally operable to the gas of the quality and rock core outlet end gas according to output sand
The air flow value of rock core outlet end gas when the ratio of flow is more than predetermined threshold value, obtains the critical gas that gas well to be measured shakes out
Flow velocity.
The gas well provided in this embodiment that measures shakes out the device of critical gas flow velocity, more actually simulates gas reservoir by adopting
The process of gas well can be used for measuring gas well and shake out critical gas flow velocity, and accuracy is higher.
It shakes out the device of critical gas flow velocity, is illustrated using the device with reference to measurement gas well provided by the embodiment
It shakes out the corresponding method of critical gas flow velocity to measure gas well.Fig. 2 present invention measures gas well and shakes out the method for critical gas flow velocity
The flow chart of embodiment one.The method of critical gas flow velocity as shown in Fig. 2, measurement gas well provided in this embodiment shakes out, including
Following steps：
S101, the rock core for being taken from gas well reservoir to be measured is clamped in pressing device using confining pressure.
Specifically, in the step, the value of confining pressure can need specific setting according to experiment, not carried out herein to the value of confining pressure
It limits, confining pressure is specifically worth, can clamp rock core for reference.In addition, how to utilize confining pressure by rock core in pressing device
It clamps, is discussed in detail in corresponding device embodiment, details are not described herein again.
It it should be noted that before step S201, can also include, prepare the process of rock core.
S102：Air source is provided to above-mentioned rock core；The gas pressure of above-mentioned rock core entrance is adjusted to setting value.
Specifically, setting value is set according to rock core property, such as can be 10MPa.In this step, pass through pressure regulation
Valve and booster pump adjust the pressure of rock core entrance.After adjusting, gas passes through rock core with certain flow velocity.At this point, gas
Flow velocity it is typically small, rock core will not shake out.
S103：Measure the gas pressure of above-mentioned rock core entrance, the gas pressure in exit and above-mentioned rock core outlet end
The throughput of gas, and acquire inlet pressure, exit pressure levels, air flow value.
S104：After preset time, stops providing air source to above-mentioned rock core, collect the sand of above-mentioned rock core output, and right
The sand of above-mentioned output cleaned, drying and processing, measures the quality of above-mentioned rock core output sand, and acquire the quality of above-mentioned output sand
Value.
It should be noted that do not limited specifically preset time herein.
S105：The setting value for increasing rock core entrance gas pressure, repeats step S102 to S104, until the matter of output sand
When the ratio of amount and the throughput of rock core outlet end gas is more than predetermined threshold value, stop experiment；
Specifically, when the setting value of rock core entrance gas pressure increases to a certain value, step S102 is being repeated extremely
During S104, the flow velocity of gas reaches the critical gas flow velocity that gas well shakes out, and gas well shakes out.
S106：It is more than rock when predetermined threshold value according to the ratio of the quality of output sand and the throughput of rock core outlet end gas
The air flow value of heart outlet end gas calculates the critical gas flow velocity that above-mentioned rock core shakes out, the critical gas that above-mentioned rock core shakes out
Flow velocity and gas well to be measured the critical gas flow velocity that shakes out are equal, obtain the critical gas flow velocity that gas well to be measured shakes out.
Specifically, in the step, when the ratio of the quality and the air flow value of rock core outlet end gas that generate sand is more than
0.001g/m3When, the corresponding gas flow rate of air flow value at this time is the critical gas flow rate that shakes out of testing rock core.Correspondingly,
Obtain the critical gas flow rate that shakes out of gas well to be measured.
Embodiment two
The measurements gas well that embodiment one provides shakes out the device of critical gas flow velocity, although can shake out for measuring gas well
Critical gas flow velocity, still, the measurements gas well that above-described embodiment provides shakes out the device of critical gas flow velocity, in measurement gas well
When the critical gas flow velocity to shake out, the gas pressure in rock core exit is standard atmospheric pressure, the gas pressure of rock core entrance compared with
Low, the gas pressure in entire rock core is relatively low, can not be used for measuring gas well under high pressure conditions and shake out critical gas flow velocity.This reality
The gas well for applying example offer shakes out critical gas flow velocity test device, can be under testing high voltage state, critical gas that gas well shakes out
Flow velocity.
Fig. 3 be the present invention measure gas well shake out critical gas flow velocity device embodiment two structural schematic diagram.With reference to figure
3, difference lies in the gas well provided in this embodiment that measures shakes out the dress of critical gas flow velocity for the present embodiment and a upper embodiment
It sets, further includes：Outlet pressure regulating device 6,
Outlet pressure regulating device 6 is arranged after sand preparation plant 4, specific to be arranged in filter 41 and flowmeter
Between 53, the gas pressure for adjusting rock core exit.
In the present embodiment, pressure-regulating device is exported by setting, the gas pressure in rock core exit can be adjusted, in turn
Entire rock core can be made to be in high pressure conditions, using device provided in this embodiment, the gas well that can be measured under high pressure conditions goes out
Sand critical gas flow velocity.
Specifically, outlet pressure regulating device 6, including：Back-pressure valve 61 and backpressure pump 62, backpressure pump 62 connect with back-pressure valve 61
It connects, back-pressure valve 61 is connect with sand preparation plant 4.More specifically, back-pressure valve 61 is arranged between filter 41 and flowmeter 53, return
Press pump 62 is connect with back-pressure valve 61.
The gas well provided in this embodiment that measures shakes out the device of critical gas flow velocity, can measure the gas well under high pressure conditions
Critical gas of shaking out flow velocity is put into practice with better Instructing manufacture.
It shakes out the device of critical gas flow velocity, is described in detail, using this with reference to measurement gas well provided in this embodiment
Device measures gas well and shakes out the method for critical gas flow velocity.Fig. 4 is that the present invention measures gas well and shakes out the method for critical gas flow velocity
The flow chart of embodiment two, please refers to Fig. 4, and the gas well provided in this embodiment that measures shakes out the method for critical gas flow velocity, including
Following steps：
S201, the rock core for being taken from gas well reservoir to be measured is clamped in pressing device using confining pressure；
S202, air source is provided to above-mentioned rock core；The gas pressure of above-mentioned rock core entrance is adjusted to setting value；
S203, the gas pressure in above-mentioned rock core exit is adjusted to setting value；
S204：Measure the gas pressure of above-mentioned rock core entrance, the gas pressure in exit and above-mentioned rock core outlet end
The throughput of gas, and acquire inlet pressure, exit pressure levels, air flow value；
S205：After preset time, stops providing air source to above-mentioned rock core, collect the sand of above-mentioned rock core output, and right
The sand of above-mentioned output cleaned, drying and processing, measures the quality of above-mentioned rock core output sand, and acquire the quality of above-mentioned output sand
Value；
S206：The setting value for increasing rock core entrance gas pressure, in the setting value for increasing rock core entrance gas pressure
When, increase the setting value of rock core exit gas pressure, rock core pressure difference is made to maintain within a preset range；Repeat step S202 extremely
S205 stops experiment until when the quality of output sand and the ratio of the throughput of rock core outlet end gas are more than predetermined threshold value；
It in this step, can be by the setting of rock core entrance gas pressure for example, in one possible implementation
Value successively increases 3MPa, when increasing the setting value of rock core entrance gas pressure, while increasing setting for rock core outlet pressure
Definite value makes rock core pressure difference maintain 3MPa.It should be noted that the setting value of entrance gas pressure, exit gas pressure
Setting value and rock core pressure difference can adjust according to actual needs, it is not limited specifically herein.For example, Tables 1 and 2
Two kinds of measurement gas wells are provided respectively to shake out the experiment calendar of critical gas flow velocity, in table not only in step S201 confining pressure,
The setting value of rock core entrance gas pressure in S202, the setting value of the rock core exit gas pressure in S203 are set
It is fixed, also the items in step S206 are set, measure gas well shake out critical gas flow velocity when, can according to table 1 or
The experiment calendar that table 2 provides is tested, until the ratio of the quality of output sand and the throughput of rock core outlet end gas
When more than predetermined threshold value, stop experiment.
Table 1 measures gas well and shakes out the experiment arrangement of critical gas flow velocity
Table 2 measures gas well and shakes out the experiment arrangement of critical gas flow velocity
S207：It is more than rock when predetermined threshold value according to the ratio of the quality of output sand and the throughput of rock core outlet end gas
The air flow value of heart outlet end gas calculates the critical gas flow velocity that above-mentioned rock core shakes out, the critical gas that above-mentioned rock core shakes out
Flow velocity and gas well to be measured the critical gas flow velocity that shakes out are equal, obtain the critical gas flow velocity that gas well to be measured shakes out.
For example, the quality of output sand and the ratio of the throughput of rock core outlet end gas are more than 0.001g/m3When, flowmeter
The air flow value of measurement is denoted as qb.It should be noted that in the step, when calculating the critical gas flow velocity that rock core shakes out, by
It is arranged after back-pressure valve in flowmeter.Therefore, the air flow value q that flowmeter measures at this timebReally gas is in normal atmosphere
The air flow value of (pressure 0.1010MPa) under pressure.At this point, using formula (1), gas is obtained in rock core outlet pressure (rock core
Outlet pressure can be measured by outlet pressure sensor) under air flow value (being denoted as qs), the corresponding gas of the air flow value
Flow velocity is just the critical gas flow velocity that rock core shakes out.
Meaning in formula (1) represented by each amount：
qb：(flow value is that gas is stream under standard state to the flow value for the rock core outlet end gas that flowmeter measures
Magnitude), unit：m3/min；
Pb：Pressure value under standard state, unit：MPa takes 0.101MPa；
Zs：Gas Compression Factor (can be obtained by tabling look-up) under experiment condition；
Ts：Experimental temperature, unit：K, wherein Ts=273.15+t (t：Experimental temperature, unit：℃)；
Ta：Temperature value under standard state, unit：K takes 273.15K；
Ps：The gas pressure value (can be measured by outlet pressure sensor) in rock core exit, unit：MPa.
In this way, passing through formula (1), you can with the air flow value of the gas that measures flowmeter in normal conditions, be converted into
The air flow value of gas under experimental conditions, according to air flow value, in conjunction with the dimensional parameters of rock core, you can to obtain rock core in reality
The critical gas flow velocity to shake out under the conditions of testing, and since the critical gas flow velocity that gas well shakes out goes out with the rock core for being taken from the gas well
The critical gas flow velocity of sand is equal, therefore, obtains the critical gas flow velocity that gas well shakes out.
The gas well provided in this embodiment that measures shakes out the device and method of critical gas flow velocity, by core clamping device
Back-pressure valve and backpressure pump is arranged in exit, and the gas pressure value in rock core exit can be adjusted by back-pressure valve and backpressure pump,
And then entire rock core is made to be in the state of high pressure, it can be used for measuring the critical gas flow velocity that rock core under high pressure conditions shakes out, fit
It is wider with property, and better Instructing manufacture can be used for and put into practice.
It should be noted that during production practices, shake out critical gas using measurement gas well provided by the invention
The device and method of flow velocity can join after measuring the critical gas flow velocity that outlet well is shaked out according to the specific size of gas recovery well
Number calculates critical producing pressure drop and critical gas production, is put into practice with better Instructing manufacture.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according to
So can with technical scheme described in the above embodiments is modified, either to which part or all technical features into
Row equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (8)
- The device of critical gas flow velocity 1. a kind of measurement gas well shakes out, which is characterized in that including：Core clamping device, gas supply To device, inlet pressure regulating device, sand preparation plant, measurement and data collecting system；Wherein：The core clamping device, including：Confining pressure pumps and pressing device, the confining pressure pump, for being provided to the pressing device Confining pressure, so that the pressing device compresses the rock core for being taken from gas well reservoir to be measured；The gas supply system, for providing air source to the rock core；The inlet pressure regulating device is arranged between the gas supply device and the core clamping device, for adjusting Save the gas pressure of the rock core entrance；The sand preparation plant is arranged after the core clamping device, the sand for collecting the rock core output, and to institute The sand for stating output cleaned, drying and processing；The measurement and data collecting system, for measure the gas pressure of the rock core entrance, the gas pressure in exit, The throughput of rock core outlet end gas and the quality of rock core output sand, acquisition inlet pressure, exit pressure levels, air flow value And the mass value of output sand, and default threshold is more than according to the ratio of the quality of output sand and the throughput of rock core outlet end gas The air flow value of rock core outlet end gas when value obtains the critical gas flow velocity that gas well to be measured shakes out；The measurement gas well shakes out the device of critical gas flow velocity, further includes：Outlet pressure regulating device,The outlet pressure regulating device is arranged after the sand preparation plant, the gas for adjusting the rock core exit Body pressure；The outlet pressure regulating device, including：Back-pressure valve and backpressure pump.
- The device of critical gas flow velocity 2. measurement gas well according to claim 1 shakes out, which is characterized in that the backpressure pump It is connect with the back-pressure valve, the back-pressure valve is connect with the sand preparation plant.
- The device of critical gas flow velocity 3. measurement gas well according to claim 1 or 2 shakes out, which is characterized in that the gas Body feeding is gas cylinder.
- The device of critical gas flow velocity 4. measurement gas well according to claim 3 shakes out, which is characterized in that the inlet-pressure Apparatus for adjusting force, including：Regulating valve and booster pump；The regulating valve is connected with the booster pump, and one end of the regulating valve is connect with the gas supply device, the increasing One end of press pump is connect with the core clamping device.
- The device of critical gas flow velocity 5. measurement gas well according to claim 4 shakes out, which is characterized in that the sand processing Device, including：Filter, washer, baker；The filter is connect with the core clamping device, the sand for collecting the rock core output；The washer and the baker are respectively used to clean the sand of the output, drying and processing.
- 6. the gas well according to claim 5 that measures shakes out the device of critical gas flow velocity, which is characterized in that the measurement with Data collecting system includes：Inlet pressure sensor, outlet pressure sensor, flowmeter, mass measurement meter, data collector；The inlet pressure sensor is arranged in the pressing device input end, the gas pressure for measuring rock core entrance；The outlet pressure sensor is arranged in the pressing device outlet end, the gas pressure for measuring rock core exit；The flowmeter is arranged after the sand preparation plant, the throughput for measuring rock core outlet end gas；The mass measurement meter, the quality for measuring the rock core output sand；The data collector, respectively with the inlet pressure sensor, the outlet pressure sensor, the flowmeter, institute It states mass measurement meter to connect, the mass value for acquiring inlet pressure, exit pressure levels, air flow value and output sand, and It is more than rock core outlet end gas when predetermined threshold value according to the ratio of the quality of output sand and the throughput of rock core outlet end gas Air flow value, obtain the critical gas flow velocity that gas well to be measured shakes out.
- The device of critical gas flow velocity 7. gas well according to any one of claim 4 to 6 shakes out, which is characterized in that described Inlet pressure regulating device further includes：Buffer unit；The buffer unit is arranged after the booster pump, the gas pressure for stablizing rock core entrance.
- A kind of method of critical gas flow velocity 8. measurement gas well shakes out, which is characterized in that include the following steps：Step 1：The rock core for being taken from gas well reservoir to be measured is clamped in pressing device using confining pressure；Step 2：Air source is provided to the rock core；The gas pressure of the rock core entrance is adjusted to setting value；Step 3：Measure the gas pressure of the rock core entrance, the gas pressure in exit and rock core outlet end gas The throughput of body, and acquire inlet pressure, exit pressure levels, air flow value；Step 4：After preset time, stops providing air source to the rock core, collect the sand of the rock core output, and to institute The sand for stating output cleaned, drying and processing, measures the quality of the rock core output sand, and acquire the quality of the output sand Value；Step 5：The setting value for increasing rock core entrance gas pressure repeats step 2 to step 4, until the quality of output sand When being more than predetermined threshold value with the ratio of the throughput of rock core outlet end gas, stop experiment；Step 6：It is more than rock core when predetermined threshold value according to the ratio of the quality of output sand and the throughput of rock core outlet end gas The air flow value of outlet end gas calculates the critical gas flow velocity that the rock core shakes out, the critical gas stream that the rock core shakes out The fast critical gas flow velocity that shakes out with gas well to be measured is equal, obtains the critical gas flow velocity that gas well to be measured shakes out；Before the step 3, further include：The gas pressure in the rock core exit is adjusted to setting value；The step 5 includes：When increasing the setting value of rock core entrance gas pressure, increase rock core exit gas pressure Setting value, make rock core pressure difference maintain within a preset range；The rock core exit is provided with back-pressure valve and backpressure pump.
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| CN108956351B (en) * | 2017-05-24 | 2021-01-01 | 中国石油天然气股份有限公司 | Analysis method and device for sand-carrying gas washout rock core |
| CN113090257A (en) * | 2021-04-28 | 2021-07-09 | 中国石油天然气股份有限公司 | Volcanic formation sand production simulation test method and device |
| CN114839351B (en) * | 2022-05-17 | 2023-08-18 | 西南石油大学 | Sand discharge experimental measurement device and sand discharge measurement method thereof |
| CN115263274B (en) * | 2022-08-02 | 2023-10-10 | 重庆科技学院 | Shale gas well propping crack critical sand-production flow velocity testing device and method |
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| GB9523278D0 (en) * | 1995-11-14 | 1996-01-17 | Jordan Kent Metering Systems L | A wet gas multiphase meter |
| CN101603971B (en) * | 2009-07-22 | 2011-02-09 | 中国石油天然气股份有限公司 | Flow speed measurement instrument and measurement method in micro flow |
| CN101915090B (en) * | 2010-07-29 | 2013-04-24 | 中国海洋石油总公司 | System and method for monitoring sand production rate of oil-gas well |
| CN101915854B (en) * | 2010-08-06 | 2011-12-14 | 中国石油大学(北京) | Device and method for detecting sanding critical flow velocity of gas well |
| CN102374963B (en) * | 2010-08-27 | 2013-05-01 | 中国石油大学(北京) | Test device for evaluating well completion manner of coal bed methane |
| CN203835304U (en) * | 2014-04-11 | 2014-09-17 | 中国石油大学(北京) | Foam discharging shaft sand carrying visualization experiment device |
| CN104634694A (en) * | 2015-01-23 | 2015-05-20 | 山东科技大学 | Experimental device for measuring lost gas of heterogeneous sandstone in high speed gas injection process |
| CN205135617U (en) * | 2015-09-08 | 2016-04-06 | 中国石油大学(北京) | Evaluation open hole completion gas well shakes out critical pressure less than experimental apparatus |
| CN205317740U (en) * | 2015-09-10 | 2016-06-15 | 中国石油大学(北京) | Different moisture content shaked out critical pressure less than experimental apparatus after evaluation open hole completion gas well went out water |
| CN105675445B (en) * | 2016-03-25 | 2018-06-05 | 中国石油大学(华东) | Supercritical carbon dioxide capillary viscometer and application method under a kind of high temperature and pressure |
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