CN111022009A - Imbibition experimental device and method under pulse action - Google Patents
Imbibition experimental device and method under pulse action Download PDFInfo
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- CN111022009A CN111022009A CN201911375069.1A CN201911375069A CN111022009A CN 111022009 A CN111022009 A CN 111022009A CN 201911375069 A CN201911375069 A CN 201911375069A CN 111022009 A CN111022009 A CN 111022009A
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- 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
- E21B43/20—Displacing by water
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- 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
- E21B47/00—Survey of boreholes or wells
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- 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
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Abstract
The invention relates to an experimental device and an experimental method for infiltration and suction under the action of pulses, and the specific scheme is as follows: preparing a core to be tested, loading the core into the infiltration and absorption device, and adjusting the length of an inlet screw to control the core between an inlet core groove and an outlet core groove; connecting an experimental device, adjusting the corresponding state by a three-way switch, filling water into the intermediate container, and adding a proper amount of water into the separation bottle through a drain pipe for oil-water separation; controlling a pulse controller to set a pulse signal with a certain frequency, opening a constant flow pump, starting pulse water injection, and determining a pulse pressure value; and measuring the volume of the oil expelled under the action of the seepage and absorption, and calculating the oil displacement recovery rate under the action of the pulse. The invention adds the pulse device on the basis of the traditional imbibition experiment, not only considers the influence of pressure fluctuation and propagation on imbibition, but also can remove the large-amplitude interference of displacement oil displacement quantity on imbibition, can be used for the research of imbibition oil displacement recovery ratio under the action of pulse, and can realize the evaluation of natural imbibition and continuous water injection imbibition oil displacement effect.
Description
Technical Field
The invention relates to an experimental device and an experimental method for infiltration and suction under the action of pulses, and belongs to the technical field of research on improving recovery ratio by physical pulse infiltration and suction oil displacement.
Background
Imbibition is the process by which a porous medium spontaneously imbibes some wetting fluid due to capillary forces. For hydrophilic reservoirs, water is a wetting phase, oil is a non-wetting phase, and the water phase enters the rock matrix along the pore throat due to the action of capillary force to displace the crude oil in the rock matrix, so that the reservoir recovery rate is increased. The main mechanism of water injection development of the low-permeability fractured reservoir is to suck water in the fractures into a rock matrix through an imbibition effect and replace crude oil in the rock matrix, so that the method for reasonably utilizing the imbibition method to recover oil has important significance for improving the development effect for the low-permeability fractured reservoir.
The pulse water injection causes an unstable pressure state in the stratum by periodically changing the water injection amount, the pressure in the stratum is periodically increased and decreased to cause unstable distribution of a pressure field in the stratum, and the locked hole channel is opened by the flow of fluid in the stratum under the effects of capillary force and hydrodynamic force, so that residual oil is displaced. Due to the heterogeneity of the stratum, in a water injection period of pulse water injection, the crude oil is driven out by removing the displacement pressure difference, and the periodic change of the water injection pressure can ensure that part of the crude oil can be continuously replaced to a high-permeability channel from a low-permeability layer, so that the recovery ratio of the oil reservoir is improved. Meanwhile, the pulse water injection mode is also regarded as a development means for effectively improving the imbibition oil displacement power. However, the pulse water injection is a dynamic process, the displacement and the imbibition effect occur simultaneously, and how to better study the influence degree of the pulse dynamic effect on the imbibition is the technical bottleneck of the indoor study. At present, the imbibition effect is mainly developed through the natural static imbibition mode and device, and the influence of pressure wave fluctuation and propagation on the imbibition effect in the water injection process is not considered, so that the influence measurement of different water injection development modes on the imbibition effect under the indoor experiment has larger errors. Therefore, the invention establishes the imbibition experimental device and the method under the pulse action, which can be used for researching pulse water injection to improve the imbibition degree, thereby obtaining the optimal pulse water injection parameter, improving the imbibition oil production effect of the low-permeability fracture oil reservoir to the maximum extent, and providing a more accurate and more practical method for researching the imbibition effect in other indoor water injection modes.
At present, the indoor test imbibition oil production is mainly measured in a natural imbibition mode, the influence of pressure wave fluctuation and propagation on the imbibition effect in the water injection process is not considered, and the influence of different water injection development modes on the imbibition effect measurement in an indoor experiment has larger errors. The patent document "method for improving injection water imbibition displacement efficiency and determining pulse times by pressure pulse, application number: 201811320793. X' the core displacement method applied in the file (core displacement must be set with confining pressure to form effective displacement at the injection and extraction ends), the displacement efficiency in the pulsating core displacement process comprises displacement oil quantity in the pulsating water injection process, pressure fluctuation in the intermittent pulse process and imbibition oil production quantity generated by pressure change in the propagation process, and the file does not finely distinguish displacement oil quantity and imbibition oil displacement quantity, but the displacement and the imbibition oil displacement are mixed together, so that inaccuracy of calculation error and parameter optimization is caused.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a seepage experiment device under the action of pulses. The device can realize the evaluation of the imbibition displacement effect under different pulse water injection frequencies and pulse water injection amplitudes, and calculate the imbibition displacement recovery ratio under different pulse water injection conditions.
The invention also provides an experimental method of the device, a method for more accurately and effectively metering the imbibition oil production without displacement pressure difference, on the basis of the traditional natural imbibition device, not only the influence of pressure fluctuation and propagation on imbibition is considered, but also the large-amplitude intervention of displacement oil displacement on imbibition can be removed, and the indoor operation is simple and the cost is low.
The technical scheme of the invention is as follows:
an imbibition experimental device under the action of pulse comprises a water supply part, a pulse part, an imbibition part and a separation part;
the water supply part comprises a constant flow pump and an intermediate container, and liquid is contained in the intermediate container;
the pulse part comprises a pulse controller and a pulse electromagnetic valve, the pulse electromagnetic valve is connected with the pulse controller, and the pulse controller is used for setting a pulse signal; the pulse electromagnetic valve is used for executing a pulse switch signal set by the pulse controller and converting the injected water into pulse water injection with a certain period; the intermediate container is connected with the pulse electromagnetic valve through a pipeline;
the imbibition part comprises an imbibition device, a core to be measured and a capillary measuring tube I, the imbibition device comprises a cavity container with two open ends, one end of the cavity container is provided with an inlet screw, the other end of the cavity container is provided with an outlet screw, the inlet screw is in threaded connection with the cavity container, the end part of the inlet screw is provided with an inlet core groove, the outlet screw is in threaded connection with the cavity container, the bottom of the outlet screw is provided with an outlet core groove, and the core to be measured is positioned between the inlet core groove and the outlet core; the inlet screw can adjust the inlet core groove to move in the imbibition device through threads, so that the core to be measured can be controlled between the inlet core groove and the outlet core groove; the inlet screw and the outlet screw are both provided with through holes in a penetrating manner, and the through holes are used for liquid circulation; the pulse electromagnetic valve is connected with the through hole of the inlet screw through a pipeline;
the separation part comprises a separation bottle and a drain pipe which are connected, the separation bottle is used for providing an oil-water separation space, the through hole of the outlet screw is connected with the separation bottle through a hose I, and the drain pipe is used for draining and adding water into the separation bottle.
Preferably, the pulse part further comprises a pressure sensor, one end of the pressure sensor is connected to the pulse solenoid valve, and the other end of the pressure sensor is connected to a pipeline between the pulse solenoid valve and the inlet screw through hole. The pressure sensor can read the pulse water filling pressure value.
The pulse controller can control the opening and closing of the pulse electromagnetic valve, if the pulse electromagnetic valve is controlled to be opened for 2s and closed for 2s, the pulse water injection frequency with the frequency of 0.25HZ can be achieved, the corresponding pulse water injection pressure is measured through the pressure sensor, pulse water injection with different frequencies and different amplitudes can be set by adjusting the opening and closing time of the pulse electromagnetic valve and the injection speed of the water injection part, the imbibition oil displacement effect under different pulse frequencies is evaluated, and the corresponding recovery ratio is calculated.
Preferably, the cavity container is a transparent pressure-resistant glass container. The pressure resistance aims at bearing the pressure and pulse amplitude of certain pulse injected water, and the transparent container wall can observe the imbibition reaction condition in the imbibition device at any time.
Preferably, the imbibition device further comprises a base, and the bottom of the cavity container is provided with the base.
Preferably, the outlet core groove is of an iron wire net structure. The oil driven out by the seepage action is prevented from being blocked in the outlet core groove.
Preferably, the imbibition device further comprises a first capillary measuring tube, the first capillary measuring tube is arranged at the upper part of the outlet of the through hole of the outlet screw, and the first capillary measuring tube is connected with the separation bottle through a pipeline. Scales are marked on the measuring tool, and measurement can be carried out.
Preferably, the separation part further comprises a second capillary measuring tube, and the second capillary measuring tube is mounted at the upper part of the separation bottle. The capillary measuring tube II measures the volume of oil expelled by the seepage action.
Further preferably, the pulse water injection is a dynamic water continuous injection process, so that in order to ensure the influence of the dynamic fluctuation process on the seepage and ensure the accuracy of the calculation of the oil amount seeped out in the process, the height of the designed drain pipe is between the height of the separation bottle and the height of the capillary measuring pipe II, so that the oil in the capillary measuring pipe can not be discharged when the water is drained, and the volume of the oil expelled by the seepage action is measured.
Preferably, the middle part of the separation bottle is connected with the seepage part through a first hose, and the bottom of the separation bottle is connected with a drain pipe through a second hose.
Preferably, a first tee joint is arranged between the pulse electromagnetic valve and the middle container, a second tee joint is arranged between the pulse electromagnetic valve and the infiltration and absorption device, and the first tee joint is connected with the second tee joint through a pipeline.
The water supply part is connected with the pulse part and the infiltration absorption part through a tee joint I and a tee joint II, and each tee joint is provided with two switches which can be used for controlling different water injection routes to respectively carry out a natural infiltration absorption experiment, a continuous water injection infiltration absorption experiment and a pulse water injection infiltration absorption experiment.
Preferably, the diameter widths of the inlet core groove and the outlet core groove are both larger than the diameter width of the core to be measured.
Further preferably, the diameter of the core to be measured is 2.5cm, and the length is 7.0 cm; the diameter of the inlet core groove and the diameter of the outlet core groove are both 2.8cm and the height of the inlet core groove and the outlet core groove is 1.0 cm; the inner diameter of the hollow container is 5.0cm, and the length of the hollow container is 12.0 cm. Because the diameter of the inlet and outlet core grooves is slightly larger than that of the core, when the infiltration suction device is used for adjusting the inlet screw to control the core to be tested in the inlet and outlet core grooves, a part of space is left between the core and the inlet and outlet core grooves, so that the infiltration suction reaction can be realized, the pulse water injection vibration space can also be provided, in addition, the confining pressure on the core cannot form effective displacement, and the influence of pulse dynamic oil displacement on the infiltration suction effect is avoided.
A method for carrying out infiltration and suction under the action of pulse by using the device specifically comprises the following steps:
(1) cleaning and drying the core to be measured, firstly saturating the core to be measured with experimental water, then displacing with experimental oil to saturate the core to be measured with experimental oil, and measuring the volume V of the saturated oil of the core to be measured0；
(2) Filling a core to be tested of saturated experimental oil into an inlet core groove in a seepage device, and adjusting the length of an inlet screw to control the core to be tested between the inlet core groove and an outlet core groove;
(3) connecting the water supply part, the pulse part, the imbibition part and the separation part, opening a switch II of the tee joint I and a switch III of the tee joint II, closing the switch I of the tee joint I and the switch IV of the tee joint II, blocking a direct pipeline channel between the tee joint I and the tee joint II, filling water into the intermediate container, and adding a proper amount of water into the separation bottle through a drain pipe for oil-water separation;
(4) controlling a pulse controller to set a pulse signal with a certain frequency, opening a constant flow pump, starting pulse water injection, and determining a pulse pressure value through a pressure sensor;
(5) after a period of time, the volume V of the oil displaced by the imbibition is measured by capillary tube IItCalculating the oil recovery ratio η under the action of pulset；
(6) And (5) adjusting pulse water filling signals with different frequencies through a pulse controller, and repeating the steps (4) to (6).
The method for carrying out natural imbibition experiment by using the device is different from the method for carrying out imbibition experiment under the action of pulse in that:
in the step (3), the separation part is removed when the device is connected, the first hose and the subsequent device are removed, and the water supply part, the pulse part and the infiltration part are connected; opening a first switch of the first tee joint and a fourth switch of the second tee joint, opening a direct pipeline channel between the first tee joint and the second tee joint, closing a second switch of the first tee joint and a third switch of the second tee joint, and directly flowing liquid from the first tee joint to the second tee joint without passing through a pulse electromagnetic valve;
in the step (4), opening the advection pump, stopping the pump after filling water in the infiltration device, and performing a natural infiltration experiment;
in step (5), the volume V of the oil expelled by the suction effect is measured by the capillary measuring tube ItAnd calculating η natural oil displacement recovery ratiot；
The experimental method for carrying out continuous water injection imbibition by using the device is different from the experimental method for imbibition under the action of pulse in that:
in the step (3), the water supply part, the pulse part, the imbibition part and the separation part are connected, a first switch of the first tee joint and a fourth switch of the second tee joint are opened during experiments, a direct pipeline channel between the first tee joint and the second tee joint is opened, the second switch of the first tee joint and the third switch of the second tee joint are closed, and liquid directly flows to the second tee joint from the first tee joint and does not pass through a pulse electromagnetic valve;
in the step (4), opening an advection pump to inject water to carry out a continuous water injection imbibition experiment;
in the step (5), the volume V of the oil expelled by the seepage action is measured through the capillary measuring tubetη continuous natural imbibition oil displacement recovery ratio is calculatedt；
The invention has the beneficial effects that:
(1) the invention provides a seepage and suction experimental device under the pulse action, which can realize the evaluation of the seepage and suction oil displacement effect under the pulse action and the evaluation of the seepage and suction oil displacement effect by natural seepage and continuous water injection by changing the connection of the device and switching different control pipelines; the pulse device is added on the basis of the traditional imbibition experiment, the influence of the fluctuation and the propagation of the pressure on the imbibition is considered, and the large-amplitude intervention of the displacement oil displacement quantity on the imbibition can be removed.
(2) The invention considers the influence of pressure fluctuation and propagation on the imbibition effect in the development mode, solves the problem of larger error in the measurement imbibition effect of the pure natural static imbibition device, and provides a more accurate and more development-actual method for developing the imbibition effect research under different water injection modes indoors.
(3) The cavity container of the infiltration device is made of transparent pressure-resistant glass, can bear the pressure and pulse amplitude action of certain pulse injected water, and the transparent container wall can observe the infiltration reaction condition in the infiltration device at any time; the inlet screw can adjust the inlet core groove to move in the imbibition device through threads, so that the core to be measured can be controlled between the inlet core groove and the outlet core groove, the outlet core groove is of an iron wire net structure, and oil driven out by the imbibition effect is prevented from being blocked in the outlet core groove; the outlet part at the upper end of the imbibition device is also provided with a first capillary measuring tube, and scales are marked on the first capillary measuring tube for measurement;
(4) the upper part of the separation bottle is provided with a second capillary measuring tube which can measure the volume of oil driven out by the seepage action, the middle part of the separation bottle is connected with the seepage part through a first hose, the tail part of the separation bottle is connected with a drain pipe through a second hose, the drainage and the water addition can be carried out, the height of the drain pipe is between the height of the separation bottle and the height of the second capillary measuring tube, the oil in the capillary measuring tube can not be discharged while the water is drained, and therefore the volume of the oil driven out by the seepage action can be measured;
(5) the method is simple and convenient to operate, has lower cost, can accurately measure the volume of the oil driven out by the imbibition, more accurately calculate the imbibition displacement recovery ratio under various conditions, and also provides a more accurate and more practical method for researching the imbibition effect in other water injection modes.
Drawings
FIG. 1 is a structural diagram of an experimental apparatus for infiltration and suction under the action of pulse according to the present invention;
FIG. 2 is a view showing the construction of the imbibition device of the invention;
wherein: 1. a advection pump; 2. an intermediate container; 3-1, carrying out tee joint I; 3-2, a second tee joint; 4-1, switching a first switch; 4-2, a second switch; 4-3, a switch III; 4-4, switch four; 5. a pulse electromagnetic valve; 6. a pressure sensor; 7. a pulse controller; 8. an imbibition device; 8-1. a hollow container; 8-2. inlet screw; 8-3, an inlet core groove; 8-4. outlet screw; 8-5 outlet core slots; 8-6 bases; 9. a rock core to be tested; 10-1, measuring a first capillary tube; 10-2, measuring a second capillary tube; 11-1, a first hose; 11-2. a second hose; 12. separating the bottles; 13. and a water discharge pipe.
Detailed Description
The present invention will be further described by way of examples, but not limited thereto, with reference to the accompanying drawings.
Example 1:
an imbibition experimental device under the action of pulse comprises a water supply part, a pulse part, an imbibition part and a separation part.
The water supply part comprises a constant flow pump and a middle container, and liquid is contained in the middle container.
The pulse part comprises a pulse controller and a pulse electromagnetic valve, the pulse electromagnetic valve is connected with the pulse controller, and the pulse controller is used for setting a pulse signal; the pulse electromagnetic valve is used for executing a pulse switch signal set by the pulse controller and converting the injected water into pulse water injection with a certain period; the intermediate container is connected with the pulse electromagnetic valve through a pipeline.
The infiltration and suction part comprises an infiltration and suction device, a core to be measured and a capillary measuring tube I, the infiltration and suction device comprises a cavity container with two open ends, and the cavity container is a transparent pressure-resistant glass container. The pressure resistance aims at bearing the pressure and pulse amplitude of certain pulse injected water, and the transparent container wall can observe the imbibition reaction condition in the imbibition device at any time.
One end of the cavity container is provided with an inlet screw, the other end of the cavity container is provided with an outlet screw, the inlet screw is in threaded connection with the cavity container, the end part of the inlet screw is provided with an inlet rock core groove, the outlet screw is in threaded connection with the cavity container, the bottom of the outlet screw is provided with an outlet rock core groove, and a rock core to be tested is positioned between the inlet rock core groove and the outlet rock core groove; the inlet screw can adjust the inlet core groove to move in the imbibition device through threads, so that the core to be measured can be controlled between the inlet core groove and the outlet core groove; the inlet screw and the outlet screw are both provided with through holes in a penetrating manner, and the through holes are used for liquid circulation; the pulse electromagnetic valve is connected with the through hole of the inlet screw through a pipeline.
The separation part comprises a separation bottle and a drain pipe which are connected, the separation bottle is used for providing an oil-water separation space, the through hole of the outlet screw is connected with the separation bottle through a hose I, and the drain pipe is used for draining and adding water into the separation bottle.
Example 2:
the utility model provides an experimental apparatus is inhaled in infiltration under pulse effect, its structure is as embodiment 1, the difference is that pulse portion still includes pressure sensor, and pressure sensor one end is connected to the pulse solenoid valve, and pressure sensor still has one end to be connected to the pipeline between pulse solenoid valve and the import screw through-hole department. The pressure sensor can read the pulse water filling pressure value.
The pulse controller can control the opening and closing of the pulse electromagnetic valve, if the pulse electromagnetic valve is controlled to be opened for 2s and closed for 2s, the pulse water injection frequency with the frequency of 0.25HZ can be achieved, the corresponding pulse water injection pressure is measured through the pressure sensor, pulse water injection with different frequencies and different amplitudes can be set by adjusting the opening and closing time of the pulse electromagnetic valve and the injection speed of the water injection part, the imbibition oil displacement effect under different pulse frequencies is evaluated, and the corresponding recovery ratio is calculated.
Example 3:
the utility model provides an experimental apparatus permeates and inhales under pulse effect, its structure as in embodiment 1, the difference is that the apparatus still includes the base, and cavity container bottom is equipped with the base.
Example 4:
the utility model provides an experimental apparatus is inhaled in infiltration under pulse effect, its structure as in embodiment 1, the difference is that export rock core groove is iron wire network structure. The oil driven out by the seepage action is prevented from being blocked in the outlet core groove.
Example 5:
a kind of experimental apparatus of infiltration and absorption under the pulse action, its structure is as described in embodiment 2, the difference is, the infiltration and absorption apparatus also includes the capillary measuring tube one, the capillary measuring tube one locates the through hole outlet upper portion of the outlet screw, mark the scale on it, can measure; the first capillary measuring tube is connected with the separation bottle through a pipeline. Scales are marked on the measuring tool, and measurement can be carried out.
The separation part also comprises a second capillary measuring tube, and the second capillary measuring tube is arranged at the upper part of the separation bottle. The capillary measuring tube II measures the volume of oil expelled by the seepage action.
The pulse water injection is a dynamic water continuous injection process, so that the height of the drain pipe is designed between the height of the separation bottle and the height of the capillary measuring pipe II in order to ensure the influence of the dynamic fluctuation process on the seepage and the accuracy of calculation of the oil quantity seeped in the process, and the oil in the capillary measuring pipe cannot be discharged while water is drained, so that the volume of the oil driven out by the seepage is measured.
Example 6:
the utility model provides a pulse effect infiltration and suction experimental apparatus, its structure is as described in embodiment 5, the difference is that separation bottle middle part is connected with infiltration and suction portion through hose one, and separation bottle bottom is through hose two connection drain pipes.
Example 7:
the utility model provides an experimental apparatus permeates and inhales under pulse effect, its structure as in embodiment 5, the difference is that be equipped with tee bend one between pulse solenoid valve and the middle container, be equipped with tee bend two between pulse solenoid valve and the infiltration suction device, link to each other through the pipeline between tee bend one and the tee bend two.
The water supply part is connected with the pulse part and the infiltration absorption part through a tee joint I and a tee joint II, and each tee joint is provided with two switches which can be used for controlling different water injection routes to respectively carry out a natural infiltration absorption experiment, a continuous water injection infiltration absorption experiment and a pulse water injection infiltration absorption experiment.
Example 8:
the utility model provides an experimental apparatus is inhaled in infiltration under pulse effect, its structure as in embodiment 1, the difference is that the diameter width of import rock core groove, export rock core groove all is greater than the diameter width of the rock core that awaits measuring.
The diameter of the core to be measured is 2.5cm, and the length is 7.0 cm; the diameter of the inlet core groove and the diameter of the outlet core groove are both 2.8cm and the height of the inlet core groove and the outlet core groove is 1.0 cm; the inner diameter of the hollow container is 5.0cm, and the length of the hollow container is 12.0 cm. Because the diameter of the inlet and outlet core grooves is slightly larger than that of the core, when the infiltration suction device is used for adjusting the inlet screw to control the core to be tested in the inlet and outlet core grooves, a part of space is left between the core and the inlet and outlet core grooves, so that the infiltration suction reaction can be realized, the pulse water injection vibration space can also be provided, in addition, the confining pressure on the core cannot form effective displacement, and the influence of pulse displacement oil displacement on the infiltration suction effect is avoided.
Example 9
A method for carrying out an imbibition experiment under the action of pulses by using the device in embodiment 7 specifically comprises the following steps:
(1) cleaning and drying the core to be measured, firstly saturating the core to be measured with experimental water, then displacing with experimental oil to saturate the core to be measured with experimental oil, and measuring the volume V of the saturated oil of the core to be measured0；
(2) Filling a core to be tested of saturated experimental oil into an inlet core groove in a seepage device, and adjusting the length of an inlet screw to control the core to be tested between the inlet core groove and an outlet core groove;
(3) connecting the water supply part, the pulse part, the imbibition part and the separation part, as shown in figure 1, opening a switch II of a tee joint I and a switch III of a tee joint II, closing the switch I of the tee joint I and a switch IV of the tee joint II, blocking a direct pipeline channel between the tee joint I and the tee joint II, filling water into an intermediate container, and adding a proper amount of water into a separation bottle through a drain pipe for oil-water separation;
(4) controlling a pulse controller to set a pulse signal with a certain frequency, opening a constant flow pump, starting pulse water injection (only forming fluctuation and propagation of pressure waves and not forming displacement), and determining a pulse pressure value through a pressure sensor;
(5) after a period of time, the volume V of the oil displaced by the imbibition is measured by capillary tube IItCalculating the oil recovery ratio η under the action of pulset；
Wherein:
ηt: recovery ratio at time t,%;
Vt: imbibition displacement volume, cm at time t3；
V0: volume of saturated oil, cm3。
(6) And (5) adjusting pulse water filling signals with different frequencies through a pulse controller, and repeating the steps (4) to (6).
Example 10
A method of conducting a natural imbibition assay using the apparatus of example 7, the procedure of which is as described in example 9, and which differs from the imbibition assay under pulsed action in that:
in the step (3), the separation part is removed when the device is connected, the first hose and the subsequent device are removed, and the water supply part, the pulse part and the infiltration part are connected; opening a first switch of the first tee joint and a fourth switch of the second tee joint, opening a direct pipeline channel between the first tee joint and the second tee joint, closing a second switch of the first tee joint and a third switch of the second tee joint, and directly flowing liquid from the first tee joint to the second tee joint without passing through a pulse electromagnetic valve;
in the step (4), opening the advection pump, stopping the pump after filling water in the infiltration device, and performing a natural infiltration experiment;
in step (5), the volume V of the oil expelled by the suction effect is measured by the capillary measuring tube ItAnd calculating η natural oil displacement recovery ratiot；
Example 11
The experimental method for continuous water injection imbibition by using the device in example 7 is as in example 9, and is different from the experimental method for imbibition under pulse action in that:
in the step (3), the water supply part, the pulse part, the imbibition part and the separation part are connected, a first switch of the first tee joint and a fourth switch of the second tee joint are opened during experiments, a direct pipeline channel between the first tee joint and the second tee joint is opened, the second switch of the first tee joint and the third switch of the second tee joint are closed, and liquid directly flows to the second tee joint from the first tee joint and does not pass through a pulse electromagnetic valve;
in the step (4), opening an advection pump to inject water to carry out a continuous water injection imbibition experiment;
in the step (5), the volume V of the oil expelled by the seepage action is measured through the capillary measuring tubetη calculating continuous water injection, seepage, absorption and oil displacement recovery ratiot；
Claims (10)
1. An imbibition experimental device under the action of pulse is characterized by comprising a water supply part, a pulse part, an imbibition part and a separation part;
the water supply part comprises a constant flow pump and an intermediate container, and liquid is contained in the intermediate container;
the pulse part comprises a pulse controller and a pulse electromagnetic valve, the pulse electromagnetic valve is connected with the pulse controller, and the pulse controller is used for setting a pulse signal; the pulse electromagnetic valve is used for executing a pulse switch signal set by the pulse controller and converting the injected water into pulse water injection with a certain period; the intermediate container is connected with the pulse electromagnetic valve through a pipeline;
the imbibition part comprises an imbibition device, a core to be measured and a capillary measuring tube I, the imbibition device comprises a cavity container with two open ends, one end of the cavity container is provided with an inlet screw, the other end of the cavity container is provided with an outlet screw, the inlet screw is in threaded connection with the cavity container, the end part of the inlet screw is provided with an inlet core groove, the outlet screw is in threaded connection with the cavity container, the bottom of the outlet screw is provided with an outlet core groove, and the core to be measured is positioned between the inlet core groove and the outlet core; the inlet screw and the outlet screw are both provided with through holes in a penetrating manner, and the through holes are used for liquid circulation; the pulse electromagnetic valve is connected with the through hole of the inlet screw through a pipeline;
the separation part comprises a separation bottle and a drain pipe which are connected, the separation bottle is used for providing an oil-water separation space, the through hole of the outlet screw is connected with the separation bottle through a hose I, and the drain pipe is used for draining and adding water into the separation bottle.
2. The experimental apparatus for infiltration suction under pulse action of claim 1, wherein the pulse part further comprises a pressure sensor, one end of the pressure sensor is connected to the pulse solenoid valve, and the other end of the pressure sensor is connected to a pipeline between the pulse solenoid valve and the inlet screw through hole.
3. The experimental apparatus for infiltration and suction under pulse action of claim 1, wherein the outlet core groove is of an iron wire net structure;
preferably, the cavity container is a transparent pressure-resistant glass container;
further preferably, the imbibition device further comprises a base, and the bottom of the cavity container is provided with the base.
4. The experimental apparatus for the pulse-based imbibition experiment as claimed in claim 2, wherein the imbibition apparatus further comprises a first capillary measuring tube, the first capillary measuring tube is disposed at the upper part of the outlet of the through hole of the outlet screw, and the first capillary measuring tube is connected with the separation bottle through a pipeline;
preferably, the separation part further comprises a second capillary measuring tube, and the second capillary measuring tube is mounted at the upper part of the separation bottle.
5. The apparatus for the experimental penetration test under the pulse action of claim 4, wherein the height of the drain pipe is between the height of the separation bottle and the height of the second capillary measuring pipe;
preferably, the middle part of the separation bottle is connected with the seepage part through a first hose, and the bottom of the separation bottle is connected with a drain pipe through a second hose.
6. The apparatus for testing infiltration suction under pulse action of claim 4, wherein a first three-way is provided between the pulse electromagnetic valve and the intermediate container, a second three-way is provided between the pulse electromagnetic valve and the infiltration suction apparatus, and the first three-way is connected with the second three-way through a pipeline.
7. The experimental apparatus for infiltration and suction under pulse action of claim 1, wherein the diameter widths of the inlet core groove and the outlet core groove are both larger than the diameter width of the core to be measured;
preferably, the diameter of the core to be measured is 2.5cm, and the length is 7.0 cm; the diameter of the inlet core groove and the diameter of the outlet core groove are both 2.8cm and the height of the inlet core groove and the outlet core groove is 1.0 cm; the inner diameter of the hollow container is 5.0cm, and the length of the hollow container is 12.0 cm.
8. A method for carrying out an infiltration and suction experiment under the pulse action by using the infiltration and suction experiment device under the pulse action of claim 6 is characterized by comprising the following steps:
(1) cleaning and drying the core to be measured, firstly saturating the core to be measured with experimental water, then displacing with experimental oil to saturate the core to be measured with experimental oil, and measuring the volume V of the saturated oil of the core to be measured0；
(2) Filling a core to be tested of saturated experimental oil into an inlet core groove in a seepage device, and adjusting the length of an inlet screw to control the core to be tested between the inlet core groove and an outlet core groove;
(3) connecting the water supply part, the pulse part, the imbibition part and the separation part, opening a switch II of the tee joint I and a switch III of the tee joint II, closing the switch I of the tee joint I and the switch IV of the tee joint II, blocking a direct pipeline channel between the tee joint I and the tee joint II, filling water into the intermediate container, and adding a proper amount of water into the separation bottle through a drain pipe for oil-water separation;
(4) controlling a pulse controller to set a pulse signal with a certain frequency, opening a constant flow pump, starting pulse water injection, and determining a pulse pressure value through a pressure sensor;
(5) after a period of time, the volume V of the oil displaced by the imbibition is measured by capillary tube IItCalculating the oil recovery ratio η under the action of pulset；
(6) And (5) adjusting pulse water filling signals with different frequencies through a pulse controller, and repeating the steps (4) to (6).
9. A natural imbibition experimental method using the imbibition experimental apparatus under the pulse action of claim 6, which is characterized by comprising the following steps:
(1) cleaning and drying the core to be measured, firstly saturating the core to be measured with experimental water, then displacing with experimental oil to saturate the core to be measured with experimental oil, and measuring the volume V of the saturated oil of the core to be measured0；
(2) Filling a core to be tested of saturated experimental oil into an inlet core groove in a seepage device, and adjusting the length of an inlet screw to control the core to be tested between the inlet core groove and an outlet core groove;
(3) when the device is connected, the separation part is removed, and the water supply part, the pulse part and the imbibition part are connected; opening a first switch of the first tee joint and a fourth switch of the second tee joint, opening a direct pipeline channel between the first tee joint and the second tee joint, closing a second switch of the first tee joint and a third switch of the second tee joint, directly flowing liquid from the first tee joint to the second tee joint without passing through a pulse electromagnetic valve, and filling water in an intermediate container;
(4) opening the advection pump, stopping the pump after filling water in the infiltration device, and performing a natural infiltration experiment;
(5) measuring volume V of oil displaced by imbibition by capillary measuring tubetAnd calculating η natural oil displacement recovery ratiot；
10. A method for carrying out continuous water injection imbibition experiments by using the imbibition experimental device under the pulse action of claim 6 is characterized by comprising the following steps:
(1) cleaning and drying the core to be measured, firstly saturating the core to be measured with experimental water, then displacing with experimental oil to saturate the core to be measured with experimental oil, and measuring the volume V of the saturated oil of the core to be measured0；
(2) Filling a core to be tested of saturated experimental oil into an inlet core groove in a seepage device, and adjusting the length of an inlet screw to control the core to be tested between the inlet core groove and an outlet core groove;
(3) the water supply part, the pulse part, the imbibition part and the separation part are connected, a first switch of the tee joint I and a fourth switch of the tee joint II are opened during experiments, a direct pipeline channel between the tee joint I and the tee joint II is opened, a second switch of the tee joint I and a third switch of the tee joint II are closed, liquid directly flows to the tee joint II from the tee joint I and does not pass through a pulse electromagnetic valve, and the middle container is filled with water;
(4) opening a constant flow pump to inject water to carry out a continuous water injection and seepage experiment;
(5) volume V of oil displaced by capillary flow measurementtη continuous natural imbibition oil displacement recovery ratio is calculatedt；
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| CN111879678A (en) * | 2020-07-31 | 2020-11-03 | 西南石油大学 | Self-priming method-based experimental method for gas-water relative permeability of tight sandstone |
| CN111879678B (en) * | 2020-07-31 | 2022-06-07 | 西南石油大学 | An experimental method for gas-water relative permeability of tight sandstone based on self-absorption method |
| CN112360430A (en) * | 2020-11-04 | 2021-02-12 | 中国石油大学(北京) | Experimental device for crack leaking stoppage simulation evaluation |
| CN113324468A (en) * | 2021-06-28 | 2021-08-31 | 山东科技大学 | Testing device and testing method for measuring seepage height of reverse seepage experiment |
| CN113324468B (en) * | 2021-06-28 | 2022-06-21 | 山东科技大学 | A kind of test device and test method for measuring imbibition height of reverse imbibition experiment |
| CN114034597A (en) * | 2021-12-09 | 2022-02-11 | 中国石油大学(华东) | Shale core high-temperature and high-pressure saturation, fracturing and imbibition integrated device and experimental method thereof |
| CN114034597B (en) * | 2021-12-09 | 2023-11-21 | 中国石油大学(华东) | Shale core high-temperature high-pressure saturation, fracturing and imbibition integrated device and method |
| CN116990484A (en) * | 2022-04-26 | 2023-11-03 | 大庆油田有限责任公司 | An unconventional core saturation oil method and its application |
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