CN104405377B - Method and device for accurately simulating core under-pressure placing displacement in laboratories - Google Patents
Method and device for accurately simulating core under-pressure placing displacement in laboratories Download PDFInfo
- Publication number
- CN104405377B CN104405377B CN201410718929.8A CN201410718929A CN104405377B CN 104405377 B CN104405377 B CN 104405377B CN 201410718929 A CN201410718929 A CN 201410718929A CN 104405377 B CN104405377 B CN 104405377B
- Authority
- CN
- China
- Prior art keywords
- pressure
- displacement
- valve
- core
- porosity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 101
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000008859 change Effects 0.000 claims abstract description 24
- 230000008569 process Effects 0.000 claims abstract description 8
- 239000011435 rock Substances 0.000 claims description 59
- 238000002474 experimental method Methods 0.000 claims description 37
- 239000003921 oil Substances 0.000 claims description 33
- 238000010438 heat treatment Methods 0.000 claims description 25
- 238000012360 testing method Methods 0.000 claims description 23
- 239000007788 liquid Substances 0.000 claims description 20
- 230000015572 biosynthetic process Effects 0.000 claims description 15
- 238000004088 simulation Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 230000035699 permeability Effects 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 7
- 229920006395 saturated elastomer Polymers 0.000 claims description 7
- 230000005489 elastic deformation Effects 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 239000011159 matrix material Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 238000005485 electric heating Methods 0.000 abstract 1
- 238000007493 shaping process Methods 0.000 description 15
- 238000005325 percolation Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 101100410811 Mus musculus Pxt1 gene Proteins 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000011549 displacement method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009533 lab test Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
Provided are a method and a device for accurately simulating core under-pressure placing displacement in laboratories and mainly aims to solve the problem of data inaccuracy caused by changeable porosity in the core deformation process when simulating core displacement in the laboratories. The method includes: obtaining the reasonable displacement pressure needed during displacement through the empirical formula, calculating the annular pressure and the displacement pressure needed for keeping the porosity so as to keep the core porosity unchanged, and keeping that the annular pressure changes along with change of the displacement pressure in the core displacement process so as to keep the differential pressure unchanged. The device is provided with a temperature adjustable electric heating core holder. A back-pressure valve is arranged at the outlet end of the core holder, and a certain pressure is constantly kept in the holder. The reasonable displacement pressure is obtained according to the empirical formula, then an annular pressure system keeps the differential pressure of the annular pressure and the displacement pressure of the holder not changed, and accordingly the core porosity is ensured not to change during deformation.
Description
Technical field
The present invention relates to a kind of method and its device for testing laboratory core placement displacement with pressure, and in particular to a kind of
The method and device of more accurate simulated experiment is carried out to formation core in oil field development production.
Background technology
In oil reservoir development engineering, test displacement test is carried out to rock core typically all to be carried out in experiment interior.But pass through
After prolonged practical application, it is found that existing test displacement method has problems with：The indoor conventional test of experiment at present
Displacement method simply treats one end pressure water injection and saturated oils of testing rock core, after heating is placed, then directly carries out test real
Test.Thus cause：1st, without pressurization during rock core to be tested heating is placed；2nd, only treat testing rock core one end to add high pressure
It is likely to result in rock core pore structure to be destroyed or pressure break；3rd, the insulating box that at present experiment interior uses can not realize high temperature, because
This is also just difficult to simulated formation temperature.Above three aspect factor cause that current laboratory experiment obtained to core test displacement reality
The data error tested is larger.
The content of the invention
The technical problem being previously mentioned in order to solve background technology, it is with pressure that the present invention provides a kind of experiment lab simulation rock core
Place the method and its device of displacement.Can keep constant by core porosity in displacement process using the method and device, from
And guarantee that obtained data are true and reliable.
The technical scheme is that：This kind is used to test the indoor accurate simulation core device for placing displacement with pressure, by
First constant pressure constant speed pump, the second constant pressure constant speed pump, first piston container, second piston container, flow gauge, electrical heating rock core
Clamper, the first pressure sensor with pressure display table and second pressure sensor, back-pressure valve and graduated cylinder composition.
Wherein, there is the back-pressure valve valve seat and back pressure container chamber, inlet, liquid outlet, piston, spring and spring to adjust
Whole knob, inlet and liquid outlet are located at the fluid course two ends in back pressure container chamber, and spring promotes piston along back pressure container chamber
Inner chamber move upwards, spring adjustment knob is used to adjust the elastic force of spring.
Electrical heating core holding unit have can seal core inner chamber, the gum cover of high temperature high voltage resistant is cased with outside the inner chamber,
The two ends of the inner chamber are closed by the threaded ends with sealing-plug, and draw the clamping with the intracavity inter-connection respectively
Device liquid stream input pipe and clamper liquid stream efferent duct；Fix between described two threaded ends outside Packed shaping drum
Wall and shaping drum inwall；The first ring set space is formed between shaping drum inwall and gum cover, shaping drum outer wall is justified with annular
The second ring set space is formed between cylinder inwall, in the second ring set space electric heater, the register position of electric heater are built-in with
Outside shaping drum outer wall；Through shaping drum outer wall and shaping drum inwall after sealed process, a ring pressure is fixed with
Ingress pipe, the opening of ring pressure ingress pipe is located in the first ring set space.
The pump discharge end of the first constant pressure constant speed pump by the road with the work of first piston container and second piston container in parallel
Plug driving force arrival end is connected；Two content output ends of first piston container and second piston container are respectively through the first valve
Jing pipelines converge into the clamper liquid stream input pipe of electrical heating core holding unit after door and the second Valve controlling break-make, in the pipe
Road is entered before clamper liquid stream input pipe, and flow gauge and the 3rd valve are connected with pipeline；
The pump discharge end of the second constant pressure constant speed pump is connected by the road with the ring pressure ingress pipe on electrical heating core holding unit,
Before the pipeline enters ring pressure ingress pipe, first pressure sensor and the 4th valve are connected with pipeline；Electrical heating rock core
The clamper liquid stream efferent duct of clamper is connected by the road with the inlet on the back-pressure valve, and in the pipeline feed liquor is entered
Before mouthful, second pressure sensor and the 5th valve are connected with pipeline；Liquid outlet on the back-pressure valve is connected with graduated cylinder.
Device described in a kind of utilization claim 1 in the indoor accurate simulation core of the experiment method for placing displacement with pressure,
The method is made up of following steps：
The first step, closes all valves in device, the sealing of check device described in claim 1；
Second step, adjusts the temperature of electrical heating core holding unit described in claim 1 to close formation temperature, by temperature
Degree Sensor monitoring its temperature change, keeps its temperature all the time near formation temperature；
3rd step, is respectively charged into into device described in claim 1 in first piston container A and second piston container B
A certain amount of water and oil, make oil and water respectively filled with the pipeline between the first valve, the second valve and the 3rd valve；
4th step, obtaining displacement pressure gradient interval by displacement pressure gradient and the relational expression of flow velocity is
(1)
In formula：--- percolation flow velocity, cm/s；--- displacement pressure gradient, Mpa/cm；--- start pressure ladder
Degree, Mpa/cm；A, b, c --- quadratic polynomial coefficient, it is mainly relevant with mobility, can be by fitting rock core pressure reduction-flow velocity experiment
Data are tried to achieve；
Rationally displacement pressure is：（2）, in formula--- rock core length, unit m；
5th step, be ensure rock porosity it is constant, according to porosity changing formula for rock elastic deformation, determine into
Reasonable ring pressure during row displacement testPc：
（3）
Above formula is exactly rock elasticity deformation process porosity change formula；
Porosity absolute change amount and porosity itself, the active porosity compressed coefficient and net confined pressure are understood by the formula（Pc—P）It is relevant；
If keeping, net confined pressure is constant, and porosity is also constant；Conversely, porosity will change；Therefore, by calculating
Displacement pressureP, in its zone of reasonableness, with its continuous increase, ring pressurePC is also continually changing, and so ensures that rock core exists
Tested in the case of rationally displacement with pressure；
In formula：Vp-rock apparent volume, m3；Vb-pore volume, m3；Cbp-plan apparent volume the compressed coefficient, 1/
Mpa；Cbc-apparent volume the compressed coefficient, 1/Mpa；Cpp-active porosity the compressed coefficient, 1/Mpa；Cr-rock matrix particle
Coefficient of bulk compressibility, 1/Mpa；Pc-burden pressure（Ring pressure）, Mpa；P-Fluid pressure（Displacement pressure）, Mpa；
6th step, is pointed to described in claim 1 electrical heating core holding unit in device（6）Interior rock core carries out saturation
Oil experiment, opens the 4th valve and the first valve, starts the second constant pressure constant speed pump to the first ring in electrical heating core holding unit
Set space adds ring pressure；
7th step, according to the numerical value drawn in the 4th step and the 5th step, determining carries out ensureing rock core during displacement test
The net confined pressure numerical value that porosity does not change；
8th step, first constant pressure constant speed pump in device, adjusts pressure and is obtained to the 4th step described in startup claim 1
Displacement pressure valuePMedianP In, open corresponding second valve of second piston container；
9th step, opens the back-pressure valve in device described in claim 1, adjusts spring adjustment knob so that described time
Back pressure value in pressure valve is equal to the displacement pressure obtained by the 8th stepP In, start saturated oils experiment；
Tenth step, after saturation is finished, device is not dismantled described in whole claim 1, closes the first constant pressure constant speed pump（1）
With the valve of piston container B, the 3rd valve and the 5th valve are closed, 24h is placed in pressurization；
11st step, starts the constant speed and constant pressure pump in device described in claim 1, opens the valve of first piston container
Door, opens valve 4 and valve 11, starts oil displacement experiment；When oil displacement experiment starts, displacement pressure P values are median PIn, return
Pressure valve is also adjusted to PIn, now pressure sensor detect displacement pressure change, by the pressure detected with ring pressure sensor
Contrasted, be to keep net confined pressure constant, manually booted constant speed and constant pressure pump and be pressurized, ring pressure Pc is PcIn；By formula（3）Know：
If remaining, ring pressure is constant with the difference of displacement pressure, so that it may ensure that the porosity of rock core is constant；
Therefore, the value for adjusting displacement pressure P is PEnd, back pressure valve regulation to PEnd, then ring pressure is also in constantly regulate to PcEnd.This
When close heater, it is ensured that core experiment is carried out under Jie Jin true formation temperature, pressure condition；Liquid to be discharged is entirely water
When, oil displacement experiment is finished；
12nd step, according to the 11st step circulate operation, repeatedly adjusts displacement pressure P, ring pressure Pc and back-pressure valve pressure
Value, is tested；
13rd step, according to the metric results and the metric results of graduated cylinder of flow gauge, calculates each displacement pressure P
Test data：The parameters such as core oil saturation and porosity, permeability, seek its mean value.
The present invention has the advantages that：Rock core displacement is calculated by the relational expression of displacement pressure gradient and flow velocity
The reasonable displacement pressure of Shi Suoxu；Placing, displacement test when add back-pressure valve in the port of export, keep in core holding unit pressure and
Ring pressure pressure is stablized；Further according to core porosity and the relation of net confined pressure, keep stress suffered by rock core constant；Adjust electrical heating rock
The close formation temperature of temperature of heart clamp holder, makes actual environment of the whole rock core in close stratum high-temperature high pressure.By flow
The amount that meter accurate measurement passes through fluid, accurately calculates the physical parameter of rock core.Adopting said method, when can reduce rock core displacement
Displacement error so that experimental situation obtains more accurately experimental data closer to actual formation situation.
Description of the drawings：
Fig. 1 is the overall structure diagram of the present invention.
Fig. 2 is the structural representation after electrical heating core holding unit of the present invention is connected with the second constant pressure constant speed pump；
Fig. 3 is the structural representation of back-pressure valve of the present invention；
Fig. 4 is the structural representation of electrical heating core holding unit of the present invention.
Specific embodiment：
Below in conjunction with the accompanying drawings the invention will be further described：
As shown in Figure 1, this kind is used to test the indoor accurate simulation core device for placing displacement with pressure, by the first constant pressure and constant
Fast pump 1, the second constant pressure constant speed pump 9, first piston container A, second piston container B, flow gauge 5, electrical heating rock core
Clamper 6, the first pressure sensor 8 with pressure display table and second pressure sensor 10, back-pressure valve and 17 groups of graduated cylinder
Into.
Wherein, the structure of the back-pressure valve is as shown in figure 3, having valve seat 12 and back pressure container chamber 13, inlet 18, going out liquid
Mouth 19, piston 22, spring 23 and spring adjustment knob 20, inlet 18 and liquid outlet 19 are located at back pressure container
Fluid course two ends in chamber 13, spring 23 promotes piston 22 to move upwards along the inner chamber of back pressure container chamber 13, bullet
Spring adjustment knob 20 is used to adjust the elastic force of spring 23.When implementing, the ZZY types of Shanghai Yu Hu companies can be adopted
Self-contained pressure regulator, without the need for external energy, actuating mechanism controls valve is introduced using by tune medium self-energy for power source
Core position, changes the pressure reduction and flow at two ends, makes before valve or downstream pressure is stable.Self-contained pressure regulator has action spirit
It is quick, good airproof performance, the advantages of pressure set-point wave force is little, self-contained pressure regulator is widely used in gas, liquid and Jie
Matter voltage stabilizing or pressure release voltage stabilizing are automatically controlled.
The structure of electrical heating core holding unit 6 as shown in figure 4, with can seal core 31 inner chamber, the inner chamber overcoat
The two ends for having the gum cover 29 of high temperature high voltage resistant, the inner chamber are closed by the threaded ends with sealing-plug, and draw respectively
With the clamper liquid stream input pipe 33 and clamper liquid stream efferent duct 21 of the intracavity inter-connection；In described two threaded ends
Between fix Packed shaping drum outer wall 27 and shaping drum inwall 32；Formed between shaping drum inwall 32 and gum cover 29
First ring set space 30, forms the second ring set space 28, in the second ring between shaping drum outer wall 27 and shaping drum inwall 32
Set space 28 is built-in with electric heater 26, and the register 25 of electric heater 26 is located at outside shaping drum outer wall 27；It is sealed
Through shaping drum outer wall 27 and shaping drum inwall 32 after process, a ring pressure ingress pipe 24, ring pressure ingress pipe 24 are fixed with
Opening be located at the first ring set space 30 in.
The pump discharge end of the first constant pressure constant speed pump 1 by the road with first piston container A and second piston container B in parallel
Piston driving force arrival end is connected；Two content output ends of first piston container A and second piston container B are respectively through
Jing pipelines converge into the clamper liquid stream input pipe of electrical heating core holding unit 6 after one valve 2 and the control break-make of the second valve 3
33, before the pipeline enters clamper liquid stream input pipe 33, the valve 4 of flow gauge 5 and the 3rd is connected with pipeline.
As shown in Fig. 2 the pump discharge end of the second constant pressure constant speed pump 9 by the road with electrical heating core holding unit 6 on ring pressure
Ingress pipe 24 is connected, and before the pipeline enters ring pressure ingress pipe 24, first pressure sensor 8 and the is connected with pipeline
Four valves 7；
The clamper liquid stream efferent duct 21 of electrical heating core holding unit 6 by the road with the back-pressure valve on the phase of inlet 18
Connection, before the pipeline enters inlet 18, is connected with the valve 11 of second pressure sensor 10 and the 5th on pipeline；
Liquid outlet 19 on the back-pressure valve is connected with graduated cylinder 17.
This kind is testing the indoor accurate simulation core method for placing displacement with pressure using described device, by following steps group
Into：
The first step, all valves closed in described device, the sealing of check device；
Second step, adjusts the temperature of electrical heating core holding unit 6 to close formation temperature, by temperature sensor monitors its
Temperature change, keeps its temperature all the time near formation temperature；
3rd step, in first piston container A and second piston container B a certain amount of water and oil are respectively charged into, make oil and
Water is respectively filled with the pipeline between the first valve 2, the second valve 3 and the 3rd valve 4；
4th step, by displacement pressure gradient and the relational expression of flow velocity, i.e. formula（1）：
（1）
In formula：--- percolation flow velocity, cm/s；--- displacement pressure gradient, Mpa/cm；A, b, c --- it is secondary multinomial
Formula coefficient, it is mainly relevant with mobility, tried to achieve by being fitted rock core pressure reduction-flow velocity experimental data.According to rock core pressure reduction-flow velocity reality
Data fitting quadratic polynomial coefficient is tested, show that quadratic polynomial coefficients statistics are as shown in table 1：
Table 1
By displacement pressure gradient and the relational expression for starting pressure, i.e. formula（2）：
（2）
In formula：--- free-boundary problem, Mpa/cm；
Merge（1）Formula and（2）Formula, obtains
（3）
Solve（3）Formula, obtains
（4）
So displacement pressure gradient interval is
（5）
So rationally displacement pressure is：（6）, in formula--- rock core length, unit m；
5th step, is to ensure that core porosity is constant, is obtained according to porosity changing formula for rock elastic deformation：
（7）
Then（8）
Again（9）
（10）
By formula（8）、（9）Substitute into（7）Formula is obtained
（11）
According to the relation between tetra- compressed coefficients of Cbc, Cbp, Cpc, Cpp, by formula（11）Arrange
（12）
Above formula is exactly rock elasticity deformation process porosity change formula.By the formula understand porosity absolute change amount with
Porosity itself, the active porosity compressed coefficient and net confined pressure（Pc—P）It is relevant.If keeping, net confined pressure is constant, and porosity is also constant；
Conversely, porosity will change.Therefore, by the displacement pressure P in the 5th step, bring into（12）Calculate reasonable ring pressure Pc interval.
In formula：Vp-rock apparent volume, m3；Vb-pore volume, m3；Cbp-plan apparent volume the compressed coefficient, 1/Mpa；Cbc—
The apparent volume compressed coefficient, 1/Mpa；Cpp-active porosity the compressed coefficient, 1/Mpa；Cr-rock matrix particle volume compression system
Number, 1/Mpa；Pc-burden pressure（Ring pressure）, Mpa；P-Fluid pressure（Displacement pressure）, Mpa.
6th step, is pointed to electrical heating core holding unit（6）Interior rock core（31）Saturated oils experiment is carried out, the 4th valve is opened
Door（7）With the first valve（2）, start the second constant pressure constant speed pump（9）To electrical heating core holding unit（6）The first interior ring set space
（30）Add ring pressure；
7th step, according to the numerical value drawn in the 4th step and the 5th step, determining carries out ensureing rock core during displacement test
The net confined pressure numerical value that porosity does not change。
8th step, starts the first constant pressure constant speed pump（1）, adjust pressure and obtain displacement pressure value to the 4th stepPCentre
ValueP In, open second piston container（B）Corresponding second valve（3）；
9th step, opens the back-pressure valve, adjusts spring adjustment knob（20）So that back pressure value in the back-pressure valve etc.
In the displacement pressure obtained by the 8th stepP In, start saturated oils experiment；
Tenth step, after saturation is finished, whole device is not dismantled, and closes the valve 3 of constant speed and constant pressure pump 1 and piston container B, is closed
24h is placed in valve closing door 4 and valve 11, pressurization；
11st step, starts constant speed and constant pressure pump 1, opens the valve 2 of piston container A, opens valve 4 and valve 11, starts
Oil displacement experiment.When oil displacement experiment starts, displacement pressure P values are median PIn, back-pressure valve also adjusted to PIn, now pressure pass
Sensor detects displacement pressure change, is contrasted by the pressure detected with ring pressure sensor, is to keep net confined pressure constant,
Manually boot constant speed and constant pressure pump to be pressurized, ring pressure Pc is PcIn；By formula（12）Know：If remaining, ring is pressed and displacement pressure
Difference it is constant, so that it may ensure that the porosity of rock core is constant.Therefore, the value for adjusting displacement pressure P is PEnd, back pressure valve regulation is extremely
PEnd, then ring pressure is also in constantly regulate to PcEnd.Now close heater, it is ensured that core experiment is Jie Jin true formation temperature, pressure
Under the conditions of carry out.When liquid to be discharged is entirely water, oil displacement experiment is finished.
12nd step, according to the 11st step circulate operation, multiple regulation displacement pressure P, ring pressure Pc, back-pressure valve pressure value,
Tested.
13rd step, according to the metric results and the metric results of graduated cylinder of flow gauge, calculates each displacement pressure P
Test data：The parameters such as core oil saturation and porosity, permeability, seek its mean value.
Experiment embodiment is given below as the embodiment above：
Connect experimental provision according to above-mentioned steps, artificial homogeneous, 2.5cm × 2.5cm × 50cm, effective permeability is
500mD., data are oozed in the hole for measuring rock core.
The first step, closes all valves in device, the sealing of check device described in claim 1；
Second step, adjusts the temperature of electrical heating core holding unit 6 to close formation temperature, by temperature sensor monitors
Its temperature change, keeps its temperature all the time near formation temperature；
3rd step, in first piston container A and second piston container B a certain amount of water and oil are respectively charged into, and are made
Oil and water are respectively filled with the pipeline between the first valve 2, the second valve 3 and the 3rd valve 4；
4th step, by displacement pressure gradient and the relational expression of flow velocity, i.e. formula（1）：
（1）
In formula：--- percolation flow velocity, cm/s；--- displacement pressure gradient, Mpa/cm；A, b, c --- it is secondary multinomial
Formula coefficient, it is mainly relevant with mobility, tried to achieve by being fitted rock core pressure reduction-flow velocity experimental data.According to rock core pressure reduction-flow velocity reality
Data fitting quadratic polynomial coefficient is tested, show that quadratic polynomial coefficients statistics table is as follows：
By displacement pressure gradient and the relational expression for starting pressure, i.e. formula（2）：
（2）
In formula：--- free-boundary problem, Mpa/cm；
Merge（1）Formula and（2）Formula, obtains
（3）
Solve（3）Formula, obtains
（4）
So displacement pressure gradient interval is
（5）
So rationally displacement pressure is：（6）, in formula--- rock core length, unit m；
So rationally displacement pressure is；In formula--- rock core length, m.
5th step, is to ensure that rock gap degree is constant, is obtained according to porosity changing formula for rock elastic deformation：
（7）
Then（8）
Again（9）
（10）
By formula（8）、（9）Substitute into（7）Formula is obtained
（11）
According to the relation between tetra- compressed coefficients of Cbc, Cbp, Cpc, Cpp, by formula（11）Arrange
（12）
Calculating rock core volume by above-mentioned steps is, driving pressure,
Then calculate reasonable ring pressure.Porosity absolute change amount and porosity sheet are understood by above formula
Body, the active porosity compressed coefficient and net confined pressure（Pc—P）It is relevant.If keeping, net confined pressure is constant, and porosity is also constant；Conversely, hole
Porosity will change.Therefore, by calculating displacement pressure, in its zone of reasonableness；Ring pressure, so ensure that rock core is tested in the case of reasonable displacement with pressure.
7th step, according to the numerical value drawn in the 5th step and the 6th step, determining carries out ensureing rock core during displacement test
The net confined pressure numerical value that porosity does not change is 4.8Mpa.
8th step, starts the first constant pressure constant speed pump 1, adjusts pressure and obtains in the range of displacement pressure value P to the 5th step, beats
Open corresponding second valve 3 of second piston container B；
9th step, opens the back-pressure valve, adjusts spring adjustment knob 20 so that the back pressure in the back-pressure valve be equal to by
The net confined pressure that 7th step is obtained, starts saturated oils experiment；
Tenth step, after saturation is finished, whole device is not dismantled, and closes the valve 3 of constant speed and constant pressure pump 1 and piston container B, is closed
24h is placed in valve closing door 4 and valve 11, pressurization, now makes rock core pressure value consistent with pressure value is calculated；
11st step, starts constant speed and constant pressure pump 1, opens the valve 2 of piston container A, opens valve 4 and valve 11, starts
Oil displacement experiment.When oil displacement experiment starts, displacement pressure P values are median, back-pressure valve also adjust to, now pressure sensor detect displacement pressure change, entered by the pressure detected with ring pressure sensor
Row contrast, is to keep net confined pressure constant, manually boots constant speed and constant pressure pump and is pressurized, and ring pressure Pc is；By
Formula（12）Know：If remaining, ring pressure is constant with the difference of displacement pressure, so that it may ensure that the porosity of rock core is constant.Therefore,
Adjust displacement pressure P value be, back pressure valve regulation is extremely, then ring pressure also in constantly regulate extremely.Now close heater, it is ensured that core experiment is carried out under Jie Jin true formation temperature, pressure condition.Treat
When discharge liquor is entirely water, oil displacement experiment is finished.
12nd step, according to the 11st step circulate operation, multiple regulation displacement pressure P, ring pressure Pc, back-pressure valve pressure value,
Tested.
13rd step, according to the metric results and the metric results of graduated cylinder of flow gauge, calculate core permeability and
The parameters such as porosity.Data are oozed to measure more accurate hole, according to above-mentioned experimental procedure and method of operating multigroup experiment is done, tried to achieve
The mean permeability 0.0051um of its experiment2With the data of porosity 0.15.And other laboratory experiments measure permeability is
0.0045um2, porosity is 0.13, and error is 11.76%, 13.33%, and it is more accurate that the experimental technique and device measure experimental data
It is reliable.
Claims (1)
1. a kind of in the indoor accurately simulation core of the experiment method for placing displacement with pressure, the method is made up of following steps：
The first step, closes the simulation core all valves placed in driving device with pressure, the sealing of check device；
Second step, adjusts the simulation core temperature for placing electrical heating core holding unit (6) in driving device with pressure to close stratum
Temperature, by its temperature change of temperature sensor monitors, keeps its temperature all the time near formation temperature；
3rd step, to simulation core is with pressure first piston container (A) and the middle difference of second piston container (B) in driving device are placed
Load a certain amount of water and oil, make oil and water respectively filled between the first valve (2), the second valve (3) and the 3rd valve (4)
Pipeline；
4th step, obtaining displacement pressure gradient interval by displacement pressure gradient and the relational expression of flow velocity is
In formula：K- core permeabilities, 10-3μm2；μ-fluid viscosity, mpas；△ p- displacement pressure gradients, Mpa/cm；G- starts
Barometric gradient, Mpa/cm；A, b, c- quadratic polynomial coefficient, it is mainly relevant with mobility, can be by being fitted rock core pressure reduction-flow velocity
Experimental data is tried to achieve；
Rationally displacement pressure is：P=△ pl (2), l- rock cores length, unit m in formula；
5th step, is to ensure that rock porosity is constant, according to porosity changing formula for rock elastic deformation, determines and is driven
For reasonable ring pressure Pc during experiment：
Above formula is exactly rock elasticity deformation process porosity change formula；
Understand that porosity absolute change amount has with porosity itself, the active porosity compressed coefficient and net confined pressure (Pc-P) by the formula
Close；
If keeping, net confined pressure is constant, and porosity is also constant；Conversely, porosity will change；Therefore, by calculating displacement
Pressure P, in its zone of reasonableness, with its continuous increase, ring pressure Pc is also continually changing, and so ensures that rock core reasonable
Tested in the case of displacement with pressure；
In formula：Cpp-active porosity the compressed coefficient, 1/Mpa；Cr-rock matrix particle volume the compressed coefficient, 1/Mpa；Pc—
Burden pressure, Mpa；P-Fluid pressure, Mpa；
6th step, is pointed to the simulation core rock core (31) placed in driving device in electrical heating core holding unit (6) with pressure and enters
Row saturated oils is tested, and opens the 4th valve (7) and the first valve (2), is started the second constant pressure constant speed pump (9) and is pressed from both sides to electrical heating rock core
The first ring set space (30) in holder (6) adds ring pressure；
7th step, according to the numerical value drawn in the 4th step and the 5th step, when determining and carrying out displacement test rock core hole is ensured
The net confined pressure numerical value (p that degree does not changec-p)；
8th step, starts the first constant pressure constant speed pump (1) in simulation core placement driving device with pressure, adjusts pressure to the 4th step institute
Obtain median P of displacement pressure value PIn, open corresponding second valve (3) of second piston container (B)；
9th step, opens the simulation core back-pressure valve placed in driving device with pressure, adjusts spring adjustment knob (20) so that institute
State the back pressure value in back-pressure valve and be equal to the displacement pressure P obtained by the 8th stepIn, start saturated oils experiment；
Tenth step, after saturation is finished, whole simulation core driving device of placing with pressure is not dismantled, and closes the first constant pressure constant speed pump
(1) and piston container B valve, close the 3rd valve (4) and the 5th valve (11), pressurization placement 24h；
11st step, starts simulation core the first constant pressure constant speed pump placed in driving device with pressure, opens first piston container
(A) valve, opens the 3rd valve (4) and the 5th valve (11), starts oil displacement experiment；When oil displacement experiment starts, displacement pressure
Power P value is median PIn, back-pressure valve also adjusted to PIn, now pressure sensor detect displacement pressure change, by with ring
The pressure that pressure sensor is detected is contrasted, and is to keep net confined pressure constant, is manually booted the second constant pressure constant speed pump and is pressurized,
Ring pressure Pc is PcIn；Known by formula (3)：If remaining, ring pressure is constant with the difference of displacement pressure, so that it may ensure the hole of rock core
Degree is constant；
Therefore, the value for adjusting displacement pressure P is PEnd, back pressure valve regulation to PEnd, then ring pressure is also in constantly regulate to PcEnd, now close
Close heater, it is ensured that core experiment is carried out under Jie Jin true formation temperature, pressure condition；When liquid to be discharged is entirely water, drive
Oil experiment is finished；
12nd step, according to the 11st step circulate operation, repeatedly adjusts displacement pressure P, ring pressure Pc and back-pressure valve pressure value, enters
Row test；
13rd step, according to the metric results and the metric results of graduated cylinder of flow gauge, calculates the examination of each displacement pressure P
Data, including core oil saturation, porosity and permeability parameter are tested, its mean value is sought.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410718929.8A CN104405377B (en) | 2014-12-02 | 2014-12-02 | Method and device for accurately simulating core under-pressure placing displacement in laboratories |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410718929.8A CN104405377B (en) | 2014-12-02 | 2014-12-02 | Method and device for accurately simulating core under-pressure placing displacement in laboratories |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104405377A CN104405377A (en) | 2015-03-11 |
| CN104405377B true CN104405377B (en) | 2017-05-10 |
Family
ID=52643033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410718929.8A Active CN104405377B (en) | 2014-12-02 | 2014-12-02 | Method and device for accurately simulating core under-pressure placing displacement in laboratories |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104405377B (en) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764859B (en) * | 2015-04-13 | 2016-06-29 | 西南石油大学 | High Temperature High Pressure tight gas reservoir Water trapping damage appraisement instrument |
| CN104863569B (en) * | 2015-04-22 | 2017-09-26 | 中国矿业大学 | Coal dust generation, the experimental provision of migration rule under ultrasonic pressing |
| CN106353223B (en) * | 2015-07-17 | 2019-11-08 | 中国石油化工股份有限公司 | Hydrocarbon gas diffusion coefficient measuring device |
| CN106198343B (en) * | 2016-06-29 | 2018-11-02 | 东北石油大学 | A kind of confining pressure control device for rock core displacement test |
| CN107620592B (en) * | 2016-07-15 | 2020-04-10 | 中国石油天然气股份有限公司 | Liquid collecting device for full-surface fluid saturation of rock core and full-surface saturation method |
| CN107676083A (en) * | 2016-08-01 | 2018-02-09 | 中国石油化工股份有限公司 | Determine the experimental method of free-boundary problem under low permeability reservoir formation condition |
| CN106404498A (en) * | 2016-08-30 | 2017-02-15 | 海安华达石油仪器有限公司 | Vacuumizing and pressurizing saturation apparatus |
| CN106640048B (en) * | 2016-09-13 | 2020-03-24 | 东北石油大学 | Pressure determination equipment and method for indoor constant-pressure chemical flooding oil displacement experiment |
| CN106226503B (en) * | 2016-10-13 | 2018-06-22 | 中国石油大学(华东) | A kind of adjustable ring presses the Oil in Super-low Permeability core holding unit of continuous non-uniform Distribution |
| CN108507919B (en) * | 2017-02-23 | 2020-06-12 | 中国石油化工股份有限公司 | Shale full-diameter core starting pressure test method under radial flow flowing mode |
| CN106970014A (en) * | 2017-03-20 | 2017-07-21 | 西南石油大学 | A kind of automatic measurement calculates the displacement method of testing of rock core physical parameter |
| CN107829715B (en) * | 2017-10-10 | 2020-09-08 | 中国石油天然气股份有限公司 | Test device and method for simulating oil reservoir water injection |
| CN107742031B (en) * | 2017-10-24 | 2021-05-28 | 重庆科技学院 | Displacement experiment artificial rock core analysis preparation method based on experiment and mathematical algorithm |
| CN108708706A (en) * | 2018-07-23 | 2018-10-26 | 广州海洋地质调查局 | The fracturing experiments device of shale silty sand oil-gas Layer |
| CN109342277B (en) * | 2018-10-19 | 2021-01-01 | 中国石油天然气股份有限公司 | Rock core holder and reverse imbibition experimental device of rock core |
| CN111307685B (en) * | 2020-01-16 | 2022-08-02 | 中国石油大学(华东) | Device and method for testing displacement, steady state and transient permeability of low-permeability rock |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1548425A1 (en) * | 1987-06-23 | 1990-03-07 | Уфимский Нефтяной Институт | Device for investigating the process of driving of oil from porous medium |
| CN101012747A (en) * | 2007-02-02 | 2007-08-08 | 中国石油大学(华东) | Gas-liquid ratio control method of rock core displacement test |
| CN101975053A (en) * | 2010-09-27 | 2011-02-16 | 中国石油大学(华东) | Hydraulic power pulse oil displacement experimental facility and experimental method thereof |
| CN202300351U (en) * | 2011-08-23 | 2012-07-04 | 中国石油天然气股份有限公司 | Long rock core model displacement device |
| CN202866801U (en) * | 2012-10-24 | 2013-04-10 | 中国石油化工股份有限公司 | Gas-liquid-ratio regulation device for rock core displacement physical simulation experiment |
| CN203335070U (en) * | 2013-07-09 | 2013-12-11 | 江苏华安科研仪器有限公司 | Multifunctional oil displacement physical simulation device |
| CN103926180A (en) * | 2014-04-15 | 2014-07-16 | 吉林大学 | Flexible core axial stress loading method in pore fluid displacement tests |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2682411Y (en) * | 2004-04-02 | 2005-03-02 | 中国石油天然气集团公司 | High temperature and high pressure core dynamic damage evaluation tester |
| CN102818054B (en) * | 2012-08-31 | 2014-12-24 | 中国石油天然气股份有限公司 | Power-assisted needle type back pressure control method and back pressure valve thereof |
-
2014
- 2014-12-02 CN CN201410718929.8A patent/CN104405377B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1548425A1 (en) * | 1987-06-23 | 1990-03-07 | Уфимский Нефтяной Институт | Device for investigating the process of driving of oil from porous medium |
| CN101012747A (en) * | 2007-02-02 | 2007-08-08 | 中国石油大学(华东) | Gas-liquid ratio control method of rock core displacement test |
| CN101975053A (en) * | 2010-09-27 | 2011-02-16 | 中国石油大学(华东) | Hydraulic power pulse oil displacement experimental facility and experimental method thereof |
| CN202300351U (en) * | 2011-08-23 | 2012-07-04 | 中国石油天然气股份有限公司 | Long rock core model displacement device |
| CN202866801U (en) * | 2012-10-24 | 2013-04-10 | 中国石油化工股份有限公司 | Gas-liquid-ratio regulation device for rock core displacement physical simulation experiment |
| CN203335070U (en) * | 2013-07-09 | 2013-12-11 | 江苏华安科研仪器有限公司 | Multifunctional oil displacement physical simulation device |
| CN103926180A (en) * | 2014-04-15 | 2014-07-16 | 吉林大学 | Flexible core axial stress loading method in pore fluid displacement tests |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104405377A (en) | 2015-03-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104405377B (en) | Method and device for accurately simulating core under-pressure placing displacement in laboratories | |
| CN206410978U (en) | A kind of tight rock gas phase relative permeability measurement apparatus | |
| CN105239973B (en) | Condensate gas reservoir blocking removal physical simulation experiment device and experiment method thereof | |
| CN110907334B (en) | Device and method for measuring radial flow oil-water relative permeability of conglomerate full-diameter core | |
| CN110793901B (en) | High-temperature high-pressure gas reservoir permeability flow rate sensitivity test method considering bound water | |
| CN105952424B (en) | A kind of supercritical water displacement of reservoir oil simulator and method | |
| CN109372499A (en) | A kind of geologic reservoir radial flow simulation system | |
| CN103711483B (en) | Simulation system and simulation method of hydrocarbon generation, adsorption and desorption of shale | |
| CN104934082B (en) | A kind of controlled ocean thermal environment analog systemss of temperature and pressure | |
| CN109470616B (en) | Multifunctional seepage testing system for rock | |
| CN205352904U (en) | It becomes interior rock stress sensitivity test of pressure device to decide confined pressure | |
| CN103257089A (en) | Pressure pulse measuring device and method for measuring permeability of matrix and crack by using same | |
| CN106908314B (en) | Rock core thermal cracking experiment system and method in high-pressure environment | |
| CN102706786A (en) | Dynamic shale pore pressure transmission tester | |
| CN105043927B (en) | It is a kind of can accurate pressure control gas absorption analysis method and device | |
| CN106771094B (en) | A kind of gelled crude compression system safety testing device and method based on hermetically sealed method | |
| CN108827679A (en) | A kind of inflating pressure thermo-structural experiment device and method of space environmental simulation | |
| CN104713801A (en) | Experiment device and method for gas adsorption and desorption of large rock samples with different sizes | |
| CN103105482B (en) | Method for testing compression characteristics of gelled crude oil | |
| CN115046897A (en) | Method and device for determining unsteady mass transfer efficiency and shape factor between matrix and crack | |
| CN110082280B (en) | Device and method for simulating and testing coalbed methane productivity change caused by discontinuous drainage | |
| CN105181269A (en) | Multi-channel fast calibration device of leakage detection device and method | |
| CN106448421A (en) | Dense oil reservoir exploitation simulation device and method | |
| CN108169098A (en) | The reasonable mining speed simulator of coal bed gas straight well single-phase flow | |
| CN208672488U (en) | A kind of pressure chamber structure and permeability test macro |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Zhang Jicheng Inventor after: Wei Jiancheng Inventor after: Chen Xinyu Inventor after: Kuang Li Inventor after: Zheng Lingyun Inventor after: Zhang Jun Inventor before: Zhang Jicheng Inventor before: Wei Jiancheng Inventor before: Rong Hongli Inventor before: Li Qi Inventor before: Wang Xiaoyue Inventor before: Wang Hongbo |
|
| COR | Change of bibliographic data | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |