CN108181224A - Displacement and capillary pressure curve translocation device and method is sucked under reservoir condition - Google Patents

Displacement and capillary pressure curve translocation device and method is sucked under reservoir condition Download PDF

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Publication number
CN108181224A
CN108181224A CN201810010000.8A CN201810010000A CN108181224A CN 108181224 A CN108181224 A CN 108181224A CN 201810010000 A CN201810010000 A CN 201810010000A CN 108181224 A CN108181224 A CN 108181224A
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CN
China
Prior art keywords
pressure
phase
non
wetted
wetting
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CN201810010000.8A
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Chinese (zh)
Inventor
付帅师
李爱芬
方齐
任晓霞
张磊
樊冬艳
谢昊君
袁翠平
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中国石油大学(华东)
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Priority to CN201810010000.8A priority Critical patent/CN108181224A/en
Publication of CN108181224A publication Critical patent/CN108181224A/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/08Investigating permeability, pore-volume, or surface area of porous materials
    • G01N15/082Investigating permeability by forcing a fluid through a sample
    • G01N15/0826Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/08Investigating permeability, pore-volume, or surface area of porous materials
    • G01N15/088Investigating volume, surface area, size or distribution of pores; Porosimetry

Abstract

The present invention relates to displacement under a kind of reservoir condition and suck capillary pressure curve translocation device and method, including triaxial stress core holding unit, place that wetting phase partly oozes partition board and non-wetted phase partly oozes partition board respectively in rock core both ends, ring last item press mechanical pressing pumps and back pressure mechanical pump Simulation Study On Pressure strata pressure, insulating box simulated formation temperature, non-wetted phase fluid piston container, wetting phase fluid piston container and constant speed and constant pressure micro pump control displacement and suck process, pressure flow sensor group, pressure gauge, gauge line and computer acquisition pressure and liquid measure data simultaneously handle calculating displacement and suck capillary pressure curve;The present invention is by simulating oil reservoir true temperature pressure and fluid condition, it the displacement of disposable METHOD FOR CONTINUOUS DETERMINATION different wetting rock and sucks capillary pressure curve and scans capillary pressure curve, the deficiency of conventional method is compensated for, solves the problems, such as the true displacement of the drawbacks of usual instrument can only measure displacement capillary pressure curve and underground and suck capillary pressure curve continuously accurately to measure.

Description

Displacement and capillary pressure curve translocation device and method is sucked under reservoir condition

Technical field

The invention belongs to reservoir rock specific physical properties evaluations fields, and in particular, to displacement under a kind of reservoir condition And suck capillary pressure curve translocation device and method.

Background technology

Since hole is tiny, capillary pressure curve is the important foundation money of such oil reservoir development design for hypotonic, fine and close oil-gas reservoir Material especially has a significant impact to the oil and gas reserves calculating in up to a hundred meters of intermediate zones.Common capillary pressure curve assay method has half Ooze baffle method, mercury injection method and centrifugal process.Ginseng used in by conversion underground capillary pressure curve being calculated as pressure mercury capillary force Number can not be measured accurately, lead to the underground capillary pressure curve of conversion and physical presence relatively large deviation;Centrifugal process is difficult simulation high temperature The reservoir condition feature of high pressure;Oil reservoir temperature and pressure condition more can be really simulated using baffle method is partly oozed, it is organic Structure is developed using the high temperature and pressure capillary pressure curve determining instrument for partly oozing baffle method.Current existing method be all it is direct or The measure displacement capillary pressure curve connect, but in reservoir formation and the various process of exploitation, between wetting phase and non-wetted phase fluid Displacement and the process of sucking differ greatly, displacement and suck capillary pressure curve and have to oil-gas field development dynamic analog and programming There are Different Effects and cannot use with.Therefore the true displacement in underground and the method and related novel device of sucking capillary pressure curve are measured Research and development it is particularly important to such Reservoir Development.

Invention content

To overcome defect of the existing technology, the present invention is provided in a kind of rock simulated under oil reservoir high-temperature and high-pressure conditions Displacement and the device for sucking capillary pressure curve translocation, for the displacement under direct disposable METHOD FOR CONTINUOUS DETERMINATION oil reservoir high-temperature and high-pressure conditions Capillary pressure curve (non-wetted phase fluid driving wetting phase fluid), sucking capillary pressure curve, (wetting phase fluid drives non-wetted phase Fluid) and different initial wetting phase saturation under suck capillary pressure curve (scanning capillary pressure curve).

Baffle method is partly oozed come displacement under METHOD FOR CONTINUOUS DETERMINATION reservoir condition using improved high temperature and pressure and sucks capillary pressure curve, Basic principle is under the conditions of oil reservoir temperature and pressure is simulated that wetting phase is placed at rock core both ends respectively and non-wetted phase partly ooze every Plate by controlling the pressure and change of fluid at rock core both ends, utilizes impressed pressure and the principle of capillary pressure balance, METHOD FOR CONTINUOUS DETERMINATION Displacement and suck capillary pressure curve.When rock core saturation soaks phase fluid, core entry end places non-wetted phase and partly oozes partition board, rock The heart port of export places wetting phase and partly oozes partition board, and under certain driving pressure, wetting phase fluid is driven with non-wetted phase fluid, when Phase fluid is soaked when impressed pressure overcomes capillary pressure, in rock core to be drained out, wetting phase fluid saturation gradually reduces.By Grade increases non-wetted phase displacement pressure, measures the accumulation wetting phase liquid measure under each steady pressure, obtains non-wetted phase fluid driving Soak the displacement capillary pressure curve of phase fluid.After maximum drive pressure is reached, non-wetted phase driving pressure is reduced step by step, is measured Rock core port of export wetting phase liquid measure changes under each pressure, obtains spontaneous sucking capillary pressure curve.When non-wetted phase driving pressure drops It after being zero, reversely pressurizes, carries out the reversed pressurised driving of rock core using rock core port of export wetting phase liquid, improve wetting phase pressure step by step Power measures the volume change of the non-wet phase fluid in core entry end when hollow billet balances, and calculates and is gradually risen with wetting phase pressure Rock core in wetting phase fluid saturation change, show that rock core wetting phase fluid drove non-wetted phase fluid sucks capillary force song Line.

To achieve the above object, the present invention uses following proposal:

Displacement and capillary pressure curve translocation device is sucked under reservoir condition, including:Triaxial stress core holding unit, three axis should Setting rock core in power core holding unit, one end of rock core sets non-wetted phase partly to ooze partition board, other end setting wetting phase partly ooze every Plate, non-wetted phase, which partly oozes partition board, wetting phase and partly oozes plug of the partition board respectively with triaxial stress core holding unit both ends, to be contacted;Three axis Stress core holding unit setting ring last item crimping mouth, ring last item crimping mouth are connected to ring last item press mechanical pressing pump, ring last item press mechanical pressing Pump is equipped with first pressure gauge;One end that triaxial stress core holding unit sets non-wetted phase partly to ooze partition board is connected to non-wetted phase The first fluid interface of back pressure controller, the pressure control interface of non-wetted phase back pressure controller are connected to the first back pressure machinery It pumps, second pressure gauge is set on the first back pressure mechanical pump;The second fluid interface of non-wetted phase back pressure controller is connected to non-profit The first fluid interface of wetting phase pressure flow sensor group, non-wetted phase back pressure controller are provided with independent data acquisition line and connect Computer is connected to, non-wetted phase pressure flow sensor group top fluidic interface is connected to non-wetted phase fluid by valve and measures Pipe, non-wetted phase pressure flow sensor group are provided with data acquisition line and are connected to computer;Non-wetted phase pressure flow sensing The second fluid interface of device group is connected to the top exit of non-wetted phase fluid piston container, in non-wetted phase fluid piston container Non-wetted phase fluid is placed, non-wetted phase fluid piston container top sets third pressure gauge, non-wetted phase fluid piston container Bottom is connected to the first constant speed and constant pressure micro pump, and the first constant speed and constant pressure micro pump is connected to computer equipped with data control collection line For Pressure control or flow control;One end that triaxial stress core holding unit setting wetting phase partly oozes partition board is connected to wetting phase back pressure The first fluid interface of controller, the pressure control interface of wetting phase back pressure controller are connected to the second back pressure mechanical pump, and second 4th pressure gauge is set on back pressure mechanical pump, and the second fluid interface of wetting phase back pressure controller is connected to wetting phase pressure flow The first fluid interface of sensor group, wetting phase back pressure controller are provided with independent data acquisition line and are connected to computer, profit Wetting phase pressure flow sensor group is provided with data acquisition line and is connected to computer, and the second of wetting phase pressure flow sensor group Fluid interface is connected to the outlet of wetting phase fluid piston container top, and interface passes through valve at the top of wetting phase pressure flow sensor group Door is connected to wetting phase fluid metering pipe, and wetting phase fluid piston container top sets the 5th pressure gauge, and wetting phase fluid piston holds Device bottom interface is connected to the second constant speed and constant pressure micro pump, and the second constant speed and constant pressure micro pump is connected to equipped with data control collection line Computer is used for Pressure control or flow control;The control of computer acquisition the first constant speed and constant pressure micro pump and the second constant speed and constant pressure micro pump Pressing pressure or flow, the injection pressure and volume flow of non-wetted phase pressure flow sensor group, wetting phase pressure flow sensing The injection pressure and volume flow of device group, the back pressure of non-wetted phase back pressure controller, the back pressure of wetting phase back pressure controller are realized The control of constant speed and constant pressure micro pump and the injection real-time inspection and control of pressure and the acquisition process of back pressure and fluid data.

Preferably, non-wetted phase fluid piston container, wetting phase fluid piston container, non-wetted phase back pressure controller, profit Wetting phase back pressure controller, triaxial stress core holding unit are set in insulating box.

Preferably, the first back pressure mechanical pump and the second back pressure mechanical pump use same back pressure mechanical pump;First constant speed and constant pressure Micro pump and the second constant speed and constant pressure micro pump use same constant speed and constant pressure micro pump.

Preferably, triaxial stress core holding unit is horizontal positioned cylindrical shape core holding unit, and triaxial stress rock core presss from both sides Rubber tube is set in holder, both ends set plug;Setting rock core in rubber tube;When rock core be hygroscopicity rock core when, wetting phase partly ooze every Plate is that the hygroscopicity being made of ceramic materials partly oozes partition board, and non-wetted phase partly oozes partition board and partly oozes partition board for oil wettability;When rock core is During oil wettability rock core, it is that oil wettability partly oozes partition board that wetting phase, which partly oozes partition board, and non-wetted phase partly oozes partition board and partly oozes partition board for hygroscopicity.

Preferably, triaxial stress core holding unit pressure resistance 60MPa;The pressure control range of non-wetted phase back pressure controller is 0~60MPa;Non-wetted phase pressure flow sensor group pressure acquisition ranging from 0~60MPa, precision 0.001MPa are adopted automatically Integrate the precision of liquid measure as 0.001mL;Non-wetted phase piston container and the high pressure resistant 60MPa of valve line, the first constant speed and constant pressure are micro- It is 0.001~60MPa, flow-control scope 0.00001mL/min to measure pump pressure control range;The pressure of wetting phase back pressure controller Power control range is 0~60MPa;Wetting phase pressure flow sensor group pressure acquisition ranging from 0~60MPa, precision are 0.001MPa, the precision of automatic collection liquid measure is 0.001mL;Wetting phase piston container and the high pressure resistant 60MPa of valve line, the Two constant speed and constant pressure micro pump pressure control ranges are 0.001~60MPa, flow-control scope 0.00001mL/min.

Preferably, triaxial stress core holding unit can independent loads ring pressure and axis pressure.

Displacement and capillary pressure curve simultaneous measuring method is sucked under reservoir condition, using displacement under above-mentioned reservoir condition and sucked Capillary pressure curve translocation device, which is characterized in that step is as follows:

(1), diameter 25mm, the standard rock core of 25~50mm of length are drilled through, it is ensured that core intersection it is smooth and with rock core axis Vertically, by rock core oil washing, drying, weighing and the dry weight for recording rock core;Prepare simulated formation water, by rock core and wetting phase partly ooze every Plate vacuumizes saturation water flooding, weighs rock core weight in wet base, calculates rock pore volume, the rock core and wetting phase after saturation is weighed half It oozes partition board to be immersed in water flooding for use, prepared water flooding is fitted into wetting phase fluid piston container;Prepare simulation ground Layer oil sample, prepared stratum oil sample is relayed using the method for constant pressure sample transfer into non-wetting fluid phase piston container, is kept Pressure is higher than stratum oil vacuole point pressure in container, and non-wetted phase is partly oozed partition board and is immersed in degassed crude for use;

(2), it is partly oozed according to non-wetted phase and is interposed between core holding unit one end, the rock core of saturation water flooding is in centre, wetting phase Mode of the partition board in the core holding unit other end is partly oozed, non-wetted phase is partly oozed partition board, rock core and wetting phase partly oozes partition board by suitable Sequence is sequentially loaded into triaxial stress core holding unit, it is ensured that rock core and partly oozes between partition board and does not have gap, loads clamper plug; It is pumped using ring last item press mechanical pressing and adds axial compressive force and ring pressure to rock core;Ring pressure is equal to or less than ring pressure higher than back pressure 2MPa, axis pressure; Non-wetted phase back pressure controller and wetting phase back pressure controller valve are opened, P is pressed using the add-back of back pressure mechanical pump0

(3), non-wetted phase fluid metering tube valve is closed, at this time non-wetted phase pressure flow sensor group the real time measure folder Holder arrival end injects pressure;Wetting phase fluid piston container using constant speed and constant pressure micro pump and equipped with water flooding, to three axis Water flooding is slowly injected into stress core holding unit, makes the Fluid pressure in rock core equal with back pressure, this is initially presses in rock core Power, it is ensured that rock core port of export pipeline is all full of by water flooding;The valve of wetting phase fluid metering pipe is opened, at this time wetting phase pressure Force flow quantity sensor group can monitor the rock core port of export and displace liquid measure, the initial liquid measure V of record wetting phase fluid metering pipe in real timew0;Make Non-wetted phase fluid piston container with constant speed and constant pressure micro pump and equipped with formation oil fills the pipeline dead volume of clamper arrival end Product, it is ensured that core entry end pipe line is all full of by formation oil;

(4), open oven heat and air-supply power supply, in insulating box triaxial stress core holding unit, rock core, non-profit Wetting phase fluid piston container, wetting phase fluid piston container and fluid line are heated up to simulated formation temperature, it is ensured that constant temperature 24 hours or more;Pay attention to paying attention to observation and regulation ring pressure and axis pressure in heating process, to eliminate fluid because temperature increases volume Pressure change caused by expansion;Computer is opened, starts displacement and sucks capillary pressure curve and test mating Row control and data Acquisition process software sets sensor initial parameter and flow option, typing rock core basic data and original measurement pipe liquid measure;

(5), displacement capillary pressure curve is tested:The injection pipeline of non-wetted phase fluid piston container is opened, closes wetting phase The injection pipeline of fluid piston container;The minimum oil phase injection pressure P of settingo1, it is micro with constant speed and constant pressure in the case where minimum injects pressure Formation oil is slowly injected into the rock core for being saturated water flooding by pump under constant pressure mode, when injection pressure overcomes capillary force When oil water drive is gone out, the water displaced partly oozed by wetting phase partition board flow into wetting phase fluid metering pipe in, routine observation wetting phase The liquid measure of fluid metering pipe, when the liquid measure of wetting phase fluid metering pipe when 8 is small it is interior no longer change when, it is believed that the setting inject Reach complete displacement under pressure, rock core displaces water as V under this pressurew1;Raising oil phase driving pressure P step by stepoi, measure each The rock core port of export displaces water V under constant injection pressurewi, until reaching injection upper pressure limit, using oil phase injection pressure with driving Water yield data calculate the displacement capillary pressure curve of rock core;

(6), it is spontaneous to suck capillary pressure curve test:Since the maximum pressure of previous step, oil phase injection is reduced step by step Pressure is measured port of export discharge reduction amount caused by being sucked under each stage pressure by capillary force is spontaneous, is noted using oil phase to back pressure Enter pressure and suck capillary pressure curve with discharge reduction data calculating the spontaneous of rock core in wetting phase fluid metering pipe;

(7), it forces to suck capillary pressure curve test:When core entry end oil phase injection pressure be down to it is equal with back pressure with Afterwards, the pipeline of non-wetted phase fluid piston container is closed, non-wetted phase fluid metering tube valve is opened, records non-wetting fluid meter Initial oil mass V in bureto0, wetting phase fluid metering tube valve is closed, opens clamper port of export wetting phase fluid piston container Pipeline;The minimum water phase injection pressure P of settingw1, water flooding is being set under constant pressure mode using constant speed and constant pressure micro pump Rock core is injected under constant-pressure, water flooding overcomes capillary force in rock core to displace the oil phase in rock core, displaces oil and passes through non-wetted phase It partly oozes partition board to flow into non-wetted phase fluid gauge line, the non-wetted phase fluid gauge line liquid measure of routine observation, when non-wetted phase stream When the oil mass of body gauge line no longer changed in 8 hours, it is believed that reach stable, rock core displaces oil mass as V under this pressureo1.Step by step Increase water phase injection pressure Pwi, measure core entry end under each constant injection pressure and displace oil mass Vwi, until reaching injection pressure The power upper limit sucks capillary pressure curve using water phase injection pressure and the pressure for displacing oil mass calculating rock core;

(8), rock core sucks capillary pressure curve test under different initial wetting phase saturations:Described in step 1~5 Method carries out oily expelling water experiment, and oil phase injection pressure is set as a certain value for being less than maximum oil phase and injecting pressure, is measured herein Rock core initial wetting phase saturation under pressure;It is initial using this pressure and saturation degree, is tested according to the step in 6~7, Show that rock core sucks capillary pressure curve under different initial wetting phase saturations;

(9), after the completion of all pressure spot data tests, preserve and export the data that software is acquired, bolt down procedure, Instrument power source is closed, clamper ring last item pressure and back pressure are all down to zero, after temperature is reduced to room temperature by closure piston container valve Core holding unit is opened, by rock core and partly partition board is oozed and takes out, the partition board that partly oozes after taking-up needs to be cleaned up with corresponding solvent And dry, it is placed in moisture-resistant cabinet and preserves;

(10), data processing, step are as follows:

Rock core gas surveys pore volume Vpg=apparent volume × gas gaging hole porosity;

Rock core liquid surveys pore volume VplThe density of saturation fluid in=(weight in wet base-dry weight)/rock core;

Rock core gas is surveyed and liquid surveys pore volume VpError should be below 0.5%;

The volume V of wetting phase fluid discharged in rock core under arbitrary non-wetted phase injection pressurew=Vwi-Vw0

Wetting phase fluid saturation S under arbitrary non-wetted phase injection pressurew=(1-VwBw/Vp) × 100%

Wherein:VwiFor the volume of wetting phase fluid discharged from rock core under arbitrary pressure;Vw0For wetting phase fluid metering The initial value of pipe liquid measure;BwFor volume factor of the wetting phase fluid (water flooding) under simulated formation pressure condition;

Capillary force P under arbitrary non-wetted phase injection pressurecoi=Poi-P0

Wherein:PoiPressure is injected for arbitrary non-wetted phase fluid;P0For back pressure;

Rock core wetting phase fluid saturation S when increasing step by step with non-wetted phase fluid (oil phase) injection pressurewWith hair Pipe power PcoiRelation curve be displacement capillary pressure curve;

Rock core wetting phase fluid saturation S when being reduced step by step with non-wetted phase fluid (oil phase) injection pressurewWith hair Pipe power PcoiRelation curve be spontaneous to suck capillary pressure curve;

The volume V of non-wetted phase fluid discharged in rock core under arbitrary wetting phase injection pressureo=Voi-Vo0

Wetting phase fluid saturation S under arbitrary wetting phase injection pressurew=Swi+VoBo/Vp× 100%

Wherein:VoiFor the volume of non-wetted phase fluid discharged from rock core under arbitrary pressure;Vo0For non-wetted phase fluid The initial value of gauge line liquid measure;BoFor volume factor of the non-wetted phase fluid (formation oil) under simulated formation pressure condition;Swi Rock core wetting phase fluid saturation when starting is driven for wetting phase;

Capillary force P under arbitrary wetting phase injection pressurecwi=Pwi-P0

Wherein:PwiFor arbitrary wetting phase fluid infusion pressure;P0For back pressure;

As wetting phase fluid (water phase) injects rock core wetting phase fluid saturation S when pressure increases step by stepwWith hollow billet Power PcwiRelation curve be force suck capillary pressure curve.

Displacement and capillary pressure curve translocation device group is sucked under reservoir condition, including:More set triaxial stress core holding units, It covers non-wetted phase back pressure controller more, covers non-wetted phase pressure flow sensor group more, cover non-wetted phase fluid gauge line more, is more Set wetting phase back pressure controller, more set wetting phase pressure flow sensor groups, more set wetting phase fluid metering pipes, cover more it is non-wetted Mutually partly ooze partition board, more set wetting phases partly ooze partition board, a set of constant speed and constant pressure micro pump, a set of non-wetted phase fluid piston container, one Cover wetting phase fluid piston container, pressure gauge, lantern ring last item press mechanical pressing pump, a set of back pressure mechanical pump, computer;Wherein:It is more Set triaxial stress core holding unit ring last item crimping mouth is connected to ring last item press mechanical pressing pump, and triaxial stress core holding unit is placed non- One end that wetting phase partly oozes partition board is connected to the first fluid interface of non-wetted phase back pressure controller, non-wetted phase back pressure controller Pressure control interface be connected to back pressure mechanical pump, the second fluid interface of non-wetted phase back pressure controller is connected to non-wetted phase The first fluid interface of pressure flow sensor group, non-wetted phase pressure flow sensor group top interface connect non-wetted phase stream Body gauge line, non-wetted pressure flow sensor group second fluid interface are connected to non-wetted phase fluid piston container top and connect Mouthful, non-wetted phase fluid piston container bottom interface is connected to constant speed and constant pressure micro pump;Triaxial stress core holding unit places profit One end that wetting phase partly oozes partition board is connected to the first fluid interface of wetting phase back pressure controller, the pressure of wetting phase back pressure controller Control interface is connected to back pressure mechanical pump, and the second fluid interface of wetting phase back pressure controller is connected to wetting phase pressure flow biography The first fluid interface of sensor group, wetting phase pressure flow sensor group top interface connection wetting phase fluid metering pipe, wetting Pressure flow sensor group second fluid interface is connected to wetting phase fluid piston container top interface, and wetting phase fluid piston holds Device bottom interface is connected to constant speed and constant pressure micro pump;Computer is equipped with parallel independent data acquisition line, and to be connected to constant speed and constant pressure micro- Amount pump covers non-wetted phase back pressure controller more, covers independent non-wetted phase pressure flow sensor group more, covers independent wetting more Phase back pressure controller covers independent wetting phase pressure flow sensor group more.

Relative to the prior art, beneficial effects of the present invention are as follows:By simulating oil reservoir true temperature pressure and fluid item Part, the displacement of disposable METHOD FOR CONTINUOUS DETERMINATION different wetting rock and suck capillary pressure curve and scanning capillary pressure curve, solve The drawbacks of usual instrument can only measure displacement capillary pressure curve, compensates for the deficiency of conventional method, solves underground and really drive Replace and suck the problem that capillary pressure curve continuously accurately measures.

Description of the drawings

Fig. 1 is displacement and to suck capillary pressure curve translocation schematic device under reservoir condition;

Fig. 2 is displacement and to suck capillary pressure curve translocation device group schematic diagram under reservoir condition;

In figure:1a, the first constant speed and constant pressure micro pump;1b, the second constant speed and constant pressure micro pump;2a, non-wetted phase fluid piston Container;2b, wetting phase fluid piston container;3a, non-wetted phase fluid;3b, wetting phase fluid;4a, first pressure gauge;4b second Pressure gauge;4c, third pressure gauge;4d, the 4th pressure gauge;4e, the 5th pressure gauge;5th, triaxial stress core holding unit;6th, rock core; 7th, non-wetted phase partly oozes partition board;8th, wetting phase partly oozes partition board;9a, non-wetted phase pressure flow sensor group;9b, wetting phase pressure Flow sensor group;10a, non-wetted phase fluid gauge line;10b, wetting phase fluid metering pipe;11a, the control of non-wetted phase back pressure Device;11b, wetting phase back pressure controller;12nd, ring last item press mechanical pressing pumps;13a, the first back pressure mechanical pump;13b, the second back pressure machinery Pump;14th, computer.

Specific embodiment

Embodiment one

As shown in Figure 1, displacement and capillary pressure curve translocation device is sucked under reservoir condition, including:Triaxial stress rock core presss from both sides Holder 5, triaxial stress core holding unit 5 are horizontal positioned cylindrical shape core holding units, and triaxial stress core holding unit is pressure-resistant 60MPa;Rubber tube is set in triaxial stress core holding unit 5, both ends set plug;Setting rock core 6, one end of rock core 6 in rubber tube Set non-wetted phase partly ooze partition board 7, the other end setting wetting phase partly ooze partition board 8;Non-wetted phase partly oozes partition board 7, wetting phase partly oozes Plug of the partition board 8 respectively with 5 both ends of triaxial stress core holding unit contacts, non-wetted phase partly ooze partition board 7 can allow for it is non-wetted Phase fluid by simultaneously prevent wetting phase fluid pass through, wetting phase partly ooze partition board 8 can allow for wetting phase fluid by and meanwhile hinder Only non-wetted phase fluid passes through;When rock core 6 is hygroscopicity rock core, it is usually to be made of ceramic materials that wetting phase, which partly oozes partition board 8, Hygroscopicity partly ooze partition board, non-wetted phase, which partly oozes partition board 7 and is generally oil wettability, partly oozes partition board;When rock core 6 is oil wettability rock core, It is usually that oil wettability partly oozes partition board that wetting phase, which partly oozes partition board 8, and non-wetted phase partly oozes partition board 7 and partly oozes partition board for hygroscopicity.

Triaxial stress core holding unit 5 sets ring last item crimping mouth, and ring last item crimping mouth is connected to ring last item press mechanical pressing pump 12, applying axial compressive force and circumferential pressure by ring last item press mechanical pressing 12 pairs of triaxial stress core holding units 5 of pump should with simulated formation Power condition, middle ring pressure and axis pressure can be equipped with first pressure gauge 4a with independent loads, ring last item press mechanical pressing pump 12, by the first pressure Power table 4a measures ring last item pressure pressure size.

One end that triaxial stress core holding unit 5 sets non-wetted phase partly to ooze partition board 7 is connected to non-wetted phase back pressure control The first fluid interface of device 11a, the pressure control interface of non-wetted phase back pressure controller 11a are connected to the first back pressure mechanical pump Second pressure gauge 4b on 13a, the first back pressure mechanical pump 13a is set, back pressure size is shown by second pressure gauge 4b;Non-wetted phase is returned The second fluid interface of pressure controller 11a is connected to the first fluid interface of non-wetted phase pressure flow sensor group 9a, non-profit Wetting phase back pressure controller 11a is for controlling the non-wetted phase of rock core 6 partly to ooze the back pressure pressure of 7 one end pipeline of partition board, to meet mould The requirement of pseudo-reservoir pressure and control of injection pressure, non-wetted phase back pressure controller 11a are provided with independent data acquisition line and connect Computer is connected to, the pressure control range of non-wetted phase back pressure controller 11a is 0~60MPa.Non-wetted phase pressure flow sensing Device group 9a top fluidic interfaces are connected to non-wetted phase fluid gauge line 10a, non-wetted phase pressure flow sensor group by valve The volume flow of non-wetted phase fluid, non-during 9a tests the displacement pressure of non-wetted phase fluid in displacement process and sucks Wetting phase pressure flow sensor group 9a is provided with data acquisition line and is connected to computer, pressure acquisition ranging from 0~60MPa, Precision is 0.001MPa, and the precision of automatic collection liquid measure is 0.001mL, and non-wetted phase fluid gauge line 10a is for directly metering Non-wetted phase fluid discharged fluid volume during sucking.The second fluid interface connection of non-wetted phase pressure flow sensor group 9a To the top exit of non-wetted phase fluid piston container 2a, non-wetted phase fluid is placed in non-wetted phase fluid piston container 2a Setting third pressure gauge 4c at the top of 3a, non-wetted phase fluid piston container 2a, third pressure gauge 4c show non-wetted phase fluid note Enter pressure, non-wetted phase piston container 2a and valve line high pressure resistant 60MPa, third pressure gauge 4c according to experiment back pressure and pressure Power size can select different accuracy and the pressure gauge of range ability, and non-wetted phase fluid piston container 2a bottoms are connected to first Constant speed and constant pressure micro pump 1a, the first constant speed and constant pressure micro pump 1a give non-wetted phase fluid 3a offers constant injection pressure, and first Constant speed and constant pressure micro pump 1a is connected to computer 14 for Pressure control or flow control, pressure control model equipped with data control collection line It encloses for 0.001~60MPa, flow-control scope 0.00001mL/min.

One end that triaxial stress core holding unit 5 sets wetting phase partly to ooze partition board 8 is connected to wetting phase back pressure controller 11b First fluid interface, the pressure control interface of wetting phase back pressure controller 11b is connected to the second back pressure mechanical pump 13b, second 4th pressure gauge 4d on back pressure mechanical pump 13b is set, back pressure size, the first back pressure mechanical pump 13a are shown by the 4th pressure gauge 4d Same back pressure mechanical pump, the second fluid interface connection of wetting phase back pressure controller 11b can be used with the second back pressure mechanical pump 13b To the first fluid interface of wetting phase pressure flow sensor group 9b, wetting phase back pressure controller 11b is used to control the profit of rock core 6 Wetting phase partly oozes the back pressure pressure of 8 one end pipeline of partition board, to meet the requirement of simulated formation pressure and control of injection pressure, wetting phase Back pressure controller 11b is provided with independent data acquisition line and is connected to computer, the pressure control of wetting phase back pressure controller 11b Ranging from 0~60MPa.Interface is connected to wetting phase fluid metering pipe by valve at the top of wetting phase pressure flow sensor group 9b 10b, wetting phase pressure flow sensor group 9b are used to test the volume flow that phase fluid is soaked in displacement process and sucked The injection pressure of non-wetted phase fluid in journey, wetting phase pressure flow sensor group 9b are provided with data acquisition line and are connected to calculating Machine, pressure acquisition ranging from 0~60MPa, precision 0.001MPa, the precision of automatic collection liquid measure are 0.001mL, wetting phase stream Body gauge line 10b soaks phase fluid discharged fluid volume for directly measuring in displacement process.Wetting phase pressure flow sensor group The second fluid interface of 9b is connected to wetting phase fluid piston container 2b top exits, is placed in wetting phase fluid piston container 2b Phase fluid 3b is soaked, the 5th pressure gauge 4e is set at the top of wetting phase fluid piston container 2b, is shown and moistened by the 5th meter pressure table 4e Wetting phase fluid 3b injects pressure, and wetting phase fluid piston container 2b and valve line can high pressure resistant 60MPa, the 5th pressure gauge 4e Different accuracy and the pressure gauge of range ability, wetting phase fluid piston container 2b can be selected according to experiment back pressure and pressure size Bottom interface is connected to the second constant speed and constant pressure micro pump 1b, the second constant speed and constant pressure micro pump 1b and is used to provide to wetting phase fluid permanent Fixed injection pressure, the second constant speed and constant pressure micro pump 2b are connected to computer 14 for pressure or stream equipped with data control collection line Amount control, pressure control range are 0.001~60MPa, flow-control scope 0.00001mL/min, and the first constant speed and constant pressure is micro It can be same constant speed and constant pressure micro pump to pump 1a and the second constant speed and constant pressure micro pump 1b.

Displacement and capillary pressure curve translocation device is sucked under reservoir condition, controlled by the first constant speed and constant pressure micro pump 1a non- Wetting phase fluid piston container 2a, non-wetted phase fluid 3a under raised constant pressure is step by step injected into and is saturated wetting phase In the rock core 6 of fluid 3b, non-wet phase fluid 3a displaces the wetting phase fluid in rock core 6 into wetting phase fluid metering pipe 10b, Capillary pressure curve is calculated by wetting phase fluid saturation variation in injection pressure and corresponding rock core 6, this is bent for displacement capillary force Line test process;Wetting phase fluid piston container 2b is controlled by the second constant speed and constant pressure micro pump 1b, wetting phase fluid 3b is existed It is injected under raised constant pressure step by step in the rock core 6 containing non-wetted phase fluid 3a, wetting phase fluid 3b will be non-in rock core 6 Wetting phase fluid is displaced into non-wetted phase fluid gauge line 10a, is satisfied by soaking phase fluid in injection pressure and corresponding rock core 6 Change with degree and calculate capillary pressure curve, this is sucks capillary pressure curve test process.

Non-wetted phase fluid piston container 2a, wetting phase fluid piston container 2b, non-wetted phase back pressure controller 11a, profit Wetting phase back pressure controller 11b, triaxial stress core holding unit 5 are set in insulating box, keep rock core and fluid in simulation oil reservoir It is tested under temperature condition.

Computer 15 acquires the control pressure or stream of the first constant speed and constant pressure micro pump 1a and the second constant speed and constant pressure micro pump 1b Amount, the injection pressure and volume flow of non-wetted phase pressure flow sensor group 9a, wetting phase pressure flow sensor group 9b's Inject pressure and volume flow, the back pressure of non-wetted phase back pressure controller 11a, the back pressure of wetting phase back pressure controller 11b.To It realizes the control of constant speed and constant pressure micro pump and injects the real-time inspection and control of pressure and the acquisition process of back pressure and fluid data.

Hereinafter, by taking hygroscopicity rock core as an example, displacement under METHOD FOR CONTINUOUS DETERMINATION reservoir condition and capillary pressure curve is sucked;Oil reservoir item Displacement and capillary pressure curve simultaneous measuring method is sucked under part, using displacement under above-mentioned reservoir condition and suck capillary pressure curve translocation dress It puts, is as follows:

1st, according to oil and gas industry standard SY/T5336, diameter 25mm, the standard rock core of 25~50mm of length are drilled through 6, it is ensured that core intersection is smooth and vertical with rock core axis, by rock core oil washing, drying, weighing and the dry weight for recording rock core 6;It prepares Rock core and wetting phase (hygroscopicity) are partly oozed partition board and vacuumize saturation water flooding, weighed rock core weight in wet base, calculate rock by simulated formation water Heart pore volume, rock core and wetting phase (hygroscopicity) after saturation is weighed partly ooze partition board and are immersed in water flooding for use, will match The water flooding made is fitted into wetting phase fluid piston container 2b;Joined according to oil and gas industry standard SY/T5542 and oil reservoir Number prepares simulated formation oil sample, prepared stratum oil sample is relayed using the method for constant pressure sample transfer to non-wetting fluid and is mutually lived It fills in container 2a, pressure is higher than stratum oil vacuole point pressure in holding container, and non-wetted phase (oil wettability) is partly oozed partition board and is immersed in It is for use in degassed crude;

2nd, it is partly oozed every 7 (oil wettabilities) in core holding unit one end according to non-wetted phase, the rock core 6 of saturation water flooding is in Between, wetting phase partly oozes mode of the partition board 8 (hygroscopicity) in the core holding unit other end, and non-wetted phase is partly oozed partition board 7, rock core 6 It partly oozes partition board 8 with wetting phase to be sequentially loaded into order in triaxial stress core holding unit, it is ensured that rock core and partly oozing between partition board does not have It has the gap, loads clamper plug;Add axial compressive force and ring pressure to rock core using ring last item press mechanical pressing pump 12;Ring pressure is higher than back pressure 2MPa, axis pressure are equal to or less than ring pressure;Non-wetted phase back pressure controller 11a and wetting phase back pressure controller 11b valves are opened, is made P is pressed with 13 add-back of back pressure mechanical pump0(above bubble point pressure could be provided as 0MPa using back pressure during simulation oil);

3rd, non-wetted phase fluid gauge line 10a valves are closed, non-wetted phase pressure flow sensor group 9a is surveyed in real time at this time Clamp holder arrival end injects pressure;Wetting phase fluid piston container using constant speed and constant pressure micro pump 1b and equipped with water flooding 2b is slowly injected into water flooding into triaxial stress core holding unit 5, makes the Fluid pressure in rock core equal with back pressure, this is rock Initial pressure in the heart, it is ensured that rock core port of export pipeline is all full of by water flooding.Open the valve of wetting phase fluid metering pipe 10b , wetting phase pressure flow sensor group 9b can monitor the rock core port of export and displace liquid measure, record wetting phase fluid meter in real time at this time The initial liquid measure V of buret 10bw0;Non-wetted phase fluid piston container 2a using constant speed and constant pressure micro pump 1a and equipped with formation oil, is filled out Fill the pipeline dead volume of clamper arrival end, it is ensured that core entry end pipe line is all full of by formation oil.

4th, open oven heat and air-supply power supply, in insulating box triaxial stress core holding unit 5, rock core 6, non-profit Wetting phase fluid piston container 2a, wetting phase fluid piston container 2b and fluid line are heated up to simulated formation temperature, it is ensured that temperature Constant 24 hours or more.Pay attention to paying attention to observation and regulation ring pressure and axis pressure in heating process, to eliminate fluid because temperature increases Pressure change caused by volume expansion.Computer 14 is opened, starts displacement and sucks capillary pressure curve and test mating Row control And Data Acquisition & Processing Software, set sensor initial parameter and flow option, typing rock core basic data and original measurement Pipe liquid measure.

5th, displacement capillary pressure curve is tested:The injection pipeline of non-wetted phase fluid piston container 2a is opened, closes wetting phase The injection pipeline of fluid piston container 2b.The minimum oil phase injection pressure P of settingo1(it is more than back pressure, is set using back pressure during degassed crude It is set to 0MPa), it is under constant pressure mode that formation oil is (non-wetted with constant speed and constant pressure micro pump 1a in the case where minimum injects pressure Phase fluid) be slowly injected into the rock core for being saturated water flooding, when inject pressure overcome capillary force when oil water drive is gone out, displace Water is partly oozed partition board 8 by wetting phase and flowed into wetting phase fluid metering pipe 10b, routine observation wetting phase fluid metering pipe 10b's Liquid measure, when the liquid measure of wetting phase fluid metering pipe 10b when 8 is small it is interior no longer change when, it is believed that assigned in the setting driving pressure To complete displacement, rock core displaces water as V under this pressurew1.Raising oil phase driving pressure P step by stepoi, measure each constant injection The rock core port of export displaces water V under pressurewi, until reaching injection upper pressure limit (related with partly oozing partition board maximum pressure voltage), make The displacement capillary pressure curve of rock core is calculated with displacing water data with oil phase injection pressure.

6th, it is spontaneous to suck capillary pressure curve test:Since the maximum pressure of previous step, oil phase injection pressure is reduced step by step Power is measured port of export discharge reduction amount caused by being sucked under each stage pressure by capillary force is spontaneous, is injected using oil phase to back pressure Pressure calculates the spontaneous of rock core with discharge reduction data in wetting phase fluid metering pipe and sucks capillary pressure curve.

7th, it forces to suck capillary pressure curve test:When core entry end oil phase injection pressure be down to it is equal with back pressure after, The pipeline of non-wetted phase fluid piston container 2a is closed, opens non-wetted phase fluid gauge line 10a valves, records non-wetting fluid Initial oil mass V in gauge line 10ao0, wetting phase fluid metering pipe 10b valves are closed, open clamper port of export wetting phase fluid The pipeline of piston container 2b.The minimum water phase injection pressure P of settingw1, using constant speed and constant pressure micro pump 1b under constant pressure mode Water flooding is injected into rock core in the case where setting pressure, water flooding overcomes capillary force in rock core to displace the oil in rock core, displaces oily warp It crosses non-wetted phase and partly oozes partition board 7 and flow into non-wetted phase fluid gauge line 10a, the non-wetted phase fluid gauge line 10a of routine observation Liquid measure, when the oil mass of non-wetted phase fluid gauge line 10a when 8 is small it is interior no longer change when, it is believed that reach stable, rock under this pressure The heart displaces oil mass as Vo1.Raising water phase injection pressure P step by stepwi, measure core entry end under each constant injection pressure and displace oil Measure Vw1, until reaching injection upper pressure limit (related with partly oozing partition board maximum pressure voltage), using water phase injection pressure and displace oil Capillary pressure curve is sucked in the pressure that amount calculates rock core.

8th, rock core sucks capillary pressure curve test under different initial wetting phase saturations:According to the side described in step 1~5 Method carries out oily expelling water experiment, oil phase injection pressure is set as a certain value for being less than maximum oil phase and injecting pressure, measure is pressed herein Rock core initial wetting phase saturation under power.It is initial using this pressure and saturation degree, is tested, obtained according to the step in 6~7 Go out rock core under different initial wetting phase saturations and suck capillary pressure curve.

9th, after the completion of all pressure spot data tests, the data that software is acquired are preserved and export, bolt down procedure closes Instrument power source is closed, clamper ring last item pressure and back pressure are all down to zero by closure piston container valve, and band temperature is beaten after being reduced to room temperature Core holding unit is opened, by rock core and partly partition board is oozed and takes out, the partition board that partly oozes after taking-up needs to be cleaned up simultaneously with corresponding solvent Drying, is placed in moisture-resistant cabinet and preserves.

10th, data processing, step are as follows:

Rock core gas surveys pore volume Vpg=apparent volume × gas gaging hole porosity;

Rock core liquid surveys pore volume VplThe density of saturation fluid in=(weight in wet base-dry weight)/rock core;

Rock core gas is surveyed and liquid surveys pore volume VpError should be below 0.5%;

The volume V of wetting phase fluid discharged in rock core under arbitrary non-wetted phase injection pressurew=Vwi-Vw0

Wetting phase fluid saturation S under arbitrary non-wetted phase injection pressurew=(1-VwBw/Vp) × 100%

Wherein:VwiFor the volume of wetting phase fluid discharged from rock core under arbitrary pressure;Vw0For wetting phase fluid metering The initial value of pipe liquid measure;BwFor volume factor of the wetting phase fluid (water flooding) under simulated formation pressure condition;

Capillary force P under arbitrary non-wetted phase injection pressurecoi=Poi-P0

Wherein:PoiPressure is injected for arbitrary non-wetted phase fluid;P0For back pressure;

Rock core wetting phase fluid saturation S when increasing step by step with non-wetted phase fluid (oil phase) injection pressurewWith hair Pipe power PcoiRelation curve be displacement capillary pressure curve;

Rock core wetting phase fluid saturation S when being reduced step by step with non-wetted phase fluid (oil phase) injection pressurewWith hair Pipe power PcoiRelation curve be spontaneous to suck capillary pressure curve;

The volume V of non-wetted phase fluid discharged in rock core under arbitrary wetting phase injection pressureo=Voi-Vo0

Wetting phase fluid saturation S under arbitrary wetting phase injection pressurew=Swi+VoBo/Vp× 100%

Wherein:VoiFor the volume of non-wetted phase fluid discharged from rock core under arbitrary pressure;Vo0For non-wetted phase fluid The initial value of gauge line liquid measure;BoFor volume factor of the non-wetted phase fluid (formation oil) under simulated formation pressure condition;Swi Rock core wetting phase fluid saturation when starting is driven for wetting phase;

Capillary force P under arbitrary wetting phase injection pressurecwi=Pwi-P0

Wherein:PwiFor arbitrary wetting phase fluid infusion pressure;P0For back pressure;

As wetting phase fluid (water phase) injects rock core wetting phase fluid saturation S when pressure increases step by stepwWith hollow billet Power PcwiRelation curve be force suck capillary pressure curve.

Above method is to be introduced according to rock core for hygroscopicity rock core, when core wettability is oil wet core, method It is identical with previous step, but water flooding or aqueous solution, wetting phase fluid piston are filled in wherein nonwetting phase fluid piston container 2a Formation oil or simulation oil are filled in container 2b, wetting phase partly oozes partition board 8 and partly oozes partition board for lipophilic, and non-wetted phase partly oozes partition board 7 and is Hydrophilic partly oozes partition board.

In conclusion the present invention put forward one kind for different wetting rock core and fluid system, in simulation oil-gas reservoir pressure Under conditions of power and temperature, accurate and continuous single-time measurement Reservoir rocks displacement and the novel translocation for sucking capillary pressure curve Device and method are realized and know clearly the true displacement in underground and suck the continuous accurate measure of capillary pressure curve.

Embodiment two

As shown in Fig. 2, displacement and capillary pressure curve translocation device group is sucked under reservoir condition, including three sets of triaxial stress rocks Heart clamp holder, three sets of non-wetted phase back pressure controllers, three sets of non-wetted phase pressure flow sensor groups, three sets of non-wetted phase fluids Gauge line, three sets of wetting phase back pressure controllers, three sets of wetting phase pressure flow sensor groups, three sets of wetting phase fluid metering pipes, Three sets of non-wetted phases partly ooze partition board, three sets of wetting phases partly ooze partition board, and a set of constant speed and constant pressure micro pump, a set of non-wetted phase fluid are lived It fills in container, a set of wetting phase fluid piston container, pressure gauge, lantern ring last item press mechanical pressing pump, a set of back pressure mechanical pump, calculate Machine;Wherein:The pressure excuse of triaxial stress core holding unit ring last item is connected to ring last item press mechanical pressing pump, triaxial stress core holding unit It places non-wetted phase and partly oozes one end of partition board and be connected to the first fluid interface of non-wetted phase back pressure controller, non-wetted phase back pressure The pressure control interface of controller is connected to back pressure mechanical pump, and the second fluid interface of non-wetted phase back pressure controller is connected to non- The first fluid interface of wetting phase pressure flow sensor group, non-wetted phase pressure flow sensor group top interface connect non-profit Wetting phase fluid metering pipe, non-wetted pressure flow sensor group second fluid interface are connected to non-wetted phase fluid piston vessel top Portion's interface, non-wetted phase fluid piston container bottom interface are connected to constant speed and constant pressure micro pump;Triaxial stress core holding unit is put It puts wetting phase and partly oozes one end of partition board and be connected to the first fluid interface of wetting phase back pressure controller, wetting phase back pressure controller Pressure control interface is connected to back pressure mechanical pump, and the second fluid interface of wetting phase back pressure controller is connected to wetting phase pressure current The first fluid interface of quantity sensor group, wetting phase pressure flow sensor group top interface connection wetting phase fluid metering pipe, Wetting pressure flow sensor group second fluid interface is connected to wetting phase fluid piston container top interface, and wetting phase fluid is lived Plug container bottom interface is connected to constant speed and constant pressure micro pump.

Three sets of independent triaxial stress core holding units, three sets of independent non-wetted phase back pressure controller 11a, three sets of independences Non-wetted phase pressure flow sensor group 9a, three sets of independent wetting phase back pressure controller 11b, three sets of independent wetting phase pressures Force flow quantity sensor group 9b, three sets of independent non-wetted phase fluid gauge line 11a and wetting phase fluid metering pipe 11b, Neng Goushi Existing three groups of experiments independent test simultaneously operation.

Computer is equipped with parallel independent data acquisition line and is connected to constant speed and constant pressure micro pump, three sets of non-wetted phase back pressure controls Device processed, three sets of independent non-wetted phase pressure flow sensor groups, three sets of independent wetting phase back pressure controllers, three sets it is independent Wetting phase pressure flow sensor group.

Claims (8)

1. displacement and capillary pressure curve translocation device is sucked under a kind of reservoir condition, including:Triaxial stress core holding unit, it is special Sign is:Setting rock core in triaxial stress core holding unit, one end of rock core set non-wetted phase partly to ooze partition board, other end setting Wetting phase partly oozes partition board, non-wetted phase partly ooze partition board, wetting phase partly ooze partition board respectively with triaxial stress core holding unit both ends Plug contacts;Triaxial stress core holding unit setting ring last item crimping mouth, ring last item crimping mouth are connected to ring last item press mechanical pressing pump, Ring last item press mechanical pressing pump is equipped with first pressure gauge;One end that triaxial stress core holding unit sets non-wetted phase partly to ooze partition board connects The first fluid interface of non-wetted phase back pressure controller is connected to, the pressure control interface of non-wetted phase back pressure controller is connected to One back pressure mechanical pump sets second pressure gauge on the first back pressure mechanical pump;The second fluid interface of non-wetted phase back pressure controller The first fluid interface of non-wetted phase pressure flow sensor group is connected to, non-wetted phase back pressure controller is provided with independent number Computer is connected to according to gathering line, non-wetted phase pressure flow sensor group top fluidic interface is connected to non-wetted phase by valve Fluid metering pipe, non-wetted phase pressure flow sensor group are provided with data acquisition line and are connected to computer;Non-wetted phase pressure The second fluid interface of flow sensor group is connected to the top exit of non-wetted phase fluid piston container, and non-wetted phase fluid is lived Non-wetted phase fluid is placed in plug container, non-wetted phase fluid piston container top sets third pressure gauge, non-wetted phase fluid Piston container bottom is connected to the first constant speed and constant pressure micro pump, and the first constant speed and constant pressure micro pump is connected equipped with data control collection line Pressure control or flow control is used for computer;One end that triaxial stress core holding unit setting wetting phase partly oozes partition board is connected to profit The first fluid interface of wetting phase back pressure controller, the pressure control interface of wetting phase back pressure controller are connected to the second back pressure machinery It pumps, the 4th pressure gauge is set on the second back pressure mechanical pump, the second fluid interface of wetting phase back pressure controller is connected to wetting phase The first fluid interface of pressure flow sensor group, wetting phase back pressure controller are provided with independent data acquisition line and are connected to meter Calculation machine, wetting phase pressure flow sensor group are provided with data acquisition line and are connected to computer, wetting phase pressure flow sensor The second fluid interface of group is connected to the outlet of wetting phase fluid piston container top, is connect at the top of wetting phase pressure flow sensor group Mouth is connected to wetting phase fluid metering pipe by valve, and wetting phase fluid piston container top sets the 5th pressure gauge, wetting phase stream Body piston container bottom interface is connected to the second constant speed and constant pressure micro pump, and the second constant speed and constant pressure micro pump is equipped with data control collection Line is connected to computer for Pressure control or flow control;Computer acquisition the first constant speed and constant pressure micro pump and the second constant speed and constant pressure are micro- The control pressure or flow of pump are measured, the injection pressure and volume flow of non-wetted phase pressure flow sensor group soak phase pressure The injection pressure and volume flow of flow sensor group, the back pressure of non-wetted phase back pressure controller, wetting phase back pressure controller Back pressure realizes the control of constant speed and constant pressure micro pump and injects the real-time inspection and control of pressure and the acquisition of back pressure and fluid data Processing.
2. displacement and suck capillary pressure curve translocation device under reservoir condition according to claim 1, it is characterised in that:It is non- Wetting phase fluid piston container, wetting phase fluid piston container, non-wetted phase back pressure controller, wetting phase back pressure controller, three Axial stress core holding unit is set in insulating box.
3. displacement and suck capillary pressure curve translocation device under the reservoir condition according to claim 1-2, it is characterised in that: First back pressure mechanical pump and the second back pressure mechanical pump use same back pressure mechanical pump;First constant speed and constant pressure micro pump and the second constant speed Constant pressure micro pump uses same constant speed and constant pressure micro pump.
4. displacement and suck capillary pressure curve translocation device under the reservoir condition according to claim 1-3, it is characterised in that: Triaxial stress core holding unit is horizontal positioned cylindrical shape core holding unit, set in triaxial stress core holding unit rubber tube, Both ends set plug;Setting rock core in rubber tube;When rock core is hygroscopicity rock core, it is by ceramic material system that wetting phase, which partly oozes partition board, Into hygroscopicity partly ooze partition board, non-wetted phase partly oozes partition board and partly oozes partition board for oil wettability;When rock core is oil wettability rock core, wetting It is that oil wettability partly oozes partition board mutually partly to ooze partition board, and non-wetted phase partly oozes partition board and partly oozes partition board for hygroscopicity.
5. displacement and suck capillary pressure curve translocation device under the reservoir condition according to claim 1-4, it is characterised in that: Triaxial stress core holding unit pressure resistance 60MPa;The pressure control range of non-wetted phase back pressure controller is 0~60MPa;It is non-wetted Phase pressure flow sensor group pressure acquisition ranging from 0~60MPa, precision 0.001MPa, the precision of automatic collection liquid measure are 0.001mL;Non-wetted phase piston container and the high pressure resistant 60MPa of valve line, the micro pump pressure control model of the first constant speed and constant pressure It encloses for 0.001~60MPa, flow-control scope 0.00001mL/min;The pressure control range of wetting phase back pressure controller is 0 ~60MPa;Wetting phase pressure flow sensor group pressure acquisition ranging from 0~60MPa, precision 0.001MPa, automatic collection The precision of liquid measure is 0.001mL;Wetting phase piston container and the high pressure resistant 60MPa of valve line, the second constant speed and constant pressure micro pump Pressure control range is 0.001~60MPa, flow-control scope 0.00001mL/min.
6. displacement and suck capillary pressure curve translocation device under the reservoir condition according to claim 1-5, it is characterised in that: Triaxial stress core holding unit can independent loads ring pressure and axis pressure.
7. displacement and capillary pressure curve simultaneous measuring method is sucked under a kind of reservoir condition, using reservoir condition described in claim 1-6 Lower displacement and suck capillary pressure curve translocation device, which is characterized in that step is as follows:
(1), diameter 25mm, the standard rock core of 25~50mm of length are drilled through, it is ensured that core intersection is smooth and vertical with rock core axis, By rock core oil washing, drying, weighing and the dry weight for recording rock core;Simulated formation water is prepared, rock core and wetting phase are partly oozed partition board takes out Vacuum saturation water flooding, weigh rock core weight in wet base, calculate rock pore volume, rock core and wetting phase after saturation is weighed partly ooze every Plate is immersed in water flooding for use, and prepared water flooding is fitted into wetting phase fluid piston container;Prepare simulated formation oil Sample is relayed prepared stratum oil sample into non-wetting fluid phase piston container using the method for constant pressure sample transfer, holding container Middle pressure is higher than stratum oil vacuole point pressure, and non-wetted phase is partly oozed partition board and is immersed in degassed crude for use;
(2), it is partly oozed according to non-wetted phase and is interposed between core holding unit one end, in centre, wetting phase partly oozes the rock core of saturation water flooding Partition board the core holding unit other end mode, by non-wetted phase partly ooze partition board, rock core and wetting phase partly ooze partition board in order according to It is secondary to be fitted into triaxial stress core holding unit, it is ensured that rock core and partly to ooze between partition board and there is no gap, load clamper plug;It uses Ring last item press mechanical pressing is pumped adds axial compressive force and ring pressure to rock core;Ring pressure is equal to or less than ring pressure higher than back pressure 2MPa, axis pressure;It opens Non-wetted phase back pressure controller and wetting phase back pressure controller valve press P using the add-back of back pressure mechanical pump0
(3), non-wetted phase fluid metering tube valve is closed, at this time non-wetted phase pressure flow sensor group the real time measure clamper Arrival end injects pressure;Wetting phase fluid piston container using constant speed and constant pressure micro pump and equipped with water flooding, to triaxial stress Water flooding is slowly injected into core holding unit, makes the Fluid pressure in rock core equal with back pressure, this is initial pressure in rock core, really Rock core port of export pipeline is protected all to be full of by water flooding;The valve of wetting phase fluid metering pipe is opened, at this time wetting phase pressure current Quantity sensor group can monitor the rock core port of export and displace liquid measure, the initial liquid measure V of record wetting phase fluid metering pipe in real timew0;Use perseverance Fast constant pressure micro pump and the non-wetted phase fluid piston container equipped with formation oil fill the pipeline dead volume of clamper arrival end, Ensure that core entry end pipe line is all full of by formation oil;
(4), open oven heat and air-supply power supply, in insulating box triaxial stress core holding unit, rock core, non-wetted phase Fluid piston container, wetting phase fluid piston container and fluid line are heated up to simulated formation temperature, it is ensured that constant temperature 24 is small When more than;Pay attention to paying attention to observation and regulation ring pressure and axis pressure in heating process, to eliminate fluid because temperature increases volume expansion Caused by pressure change;Computer is opened, starts displacement and sucks capillary pressure curve and test mating Row control and data acquisition Software is handled, sets sensor initial parameter and flow option, typing rock core basic data and original measurement pipe liquid measure;
(5), displacement capillary pressure curve is tested:The injection pipeline of non-wetted phase fluid piston container is opened, closes wetting phase fluid The injection pipeline of piston container;The minimum oil phase injection pressure P of settingo1, in the case where minimum injects pressure, existed with constant speed and constant pressure micro pump Formation oil is slowly injected under constant pressure mode in the rock core for being saturated water flooding, when inject pressure overcome capillary force when oil Water drive is gone out, the water displaced partly is oozed partition board by wetting phase and flowed into wetting phase fluid metering pipe, routine observation wetting phase fluid The liquid measure of gauge line, when the liquid measure of wetting phase fluid metering pipe when 8 is small it is interior no longer change when, it is believed that the setting inject pressure Under reach complete displacement, rock core displaces water as V under this pressurew1;Raising oil phase driving pressure P step by stepoi, measure each constant The rock core port of export displaces water V under injection pressurewi, until reaching injection upper pressure limit, using oil phase injection pressure and displace water Measure the displacement capillary pressure curve that data calculate rock core;
(6), it is spontaneous to suck capillary pressure curve test:Since the maximum pressure of previous step, oil phase injection pressure is reduced step by step To back pressure, port of export discharge reduction amount caused by being sucked under each stage pressure by capillary force is spontaneous is measured, is injected and pressed using oil phase Power calculates the spontaneous of rock core with discharge reduction data in wetting phase fluid metering pipe and sucks capillary pressure curve;
(7), it forces to suck capillary pressure curve test:When core entry end oil phase injection pressure be down to it is equal with back pressure after, close The pipeline of non-wetted phase fluid piston container is closed, non-wetted phase fluid metering tube valve is opened, records non-wetting fluid gauge line Interior initial oil mass Vo0, wetting phase fluid metering tube valve is closed, opens the pipe of clamper port of export wetting phase fluid piston container Line;The minimum water phase injection pressure P of settingw1, water flooding is pressed in setting under constant pressure mode using constant speed and constant pressure micro pump Rock core is injected under power, water flooding overcomes capillary force in rock core to displace the oil phase in rock core, displaces oil and is partly oozed by non-wetted phase Partition board is flowed into non-wetted phase fluid gauge line, the non-wetted phase fluid gauge line liquid measure of routine observation, when non-wetted phase fluid meter When the oil mass of buret no longer changed in 8 hours, it is believed that reach stable, rock core displaces oil mass as V under this pressureo1.It increases step by step Water phase injection pressure Pwi, measure core entry end under each constant injection pressure and displace oil mass Vwi, until reaching in injection pressure Limit sucks capillary pressure curve using water phase injection pressure and the pressure for displacing oil mass calculating rock core;
(8), rock core sucks capillary pressure curve test under different initial wetting phase saturations:According to the method described in step 1~5 Oily expelling water experiment is carried out, oil phase injection pressure is set as a certain value for being less than maximum oil phase and injecting pressure, is measured in this pressure Under rock core initial wetting phase saturation;It is initial using this pressure and saturation degree, is tested, obtained according to the step in 6~7 Rock core sucks capillary pressure curve under different initial wetting phase saturations;
(9), after the completion of all pressure spot data tests, the data that software is acquired are preserved and export, bolt down procedure is closed Clamper ring last item pressure and back pressure are all down to zero, are opened after temperature is reduced to room temperature by instrument power source, closure piston container valve Core holding unit by rock core and partly oozes partition board and takes out, and the partition board that partly oozes after taking-up needs to be cleaned up and dried with corresponding solvent It is dry, it is placed in moisture-resistant cabinet and preserves;
(10), data processing, step are as follows:
Rock core gas surveys pore volume Vpg=apparent volume × gas gaging hole porosity;
Rock core liquid surveys pore volume VplThe density of saturation fluid in=(weight in wet base-dry weight)/rock core;
Rock core gas is surveyed and liquid surveys pore volume VpError should be below 0.5%;
The volume V of wetting phase fluid discharged in rock core under arbitrary non-wetted phase injection pressurew=Vwi-Vw0
Wetting phase fluid saturation S under arbitrary non-wetted phase injection pressurew=(1-VwBw/Vp) × 100%
Wherein:VwiFor the volume of wetting phase fluid discharged from rock core under arbitrary pressure;Vw0For wetting phase fluid metering pipe liquid The initial value of amount;BwFor volume factor of the wetting phase fluid (water flooding) under simulated formation pressure condition;
Capillary force P under arbitrary non-wetted phase injection pressurecoi=Poi-P0
Wherein:PoiPressure is injected for arbitrary non-wetted phase fluid;P0For back pressure;
Rock core wetting phase fluid saturation S when increasing step by step with non-wetted phase fluid (oil phase) injection pressurewWith capillary force PcoiRelation curve be displacement capillary pressure curve;
Rock core wetting phase fluid saturation S when being reduced step by step with non-wetted phase fluid (oil phase) injection pressurewWith capillary force PcoiRelation curve be spontaneous to suck capillary pressure curve;
The volume V of non-wetted phase fluid discharged in rock core under arbitrary wetting phase injection pressureo=Voi-Vo0
Wetting phase fluid saturation S under arbitrary wetting phase injection pressurew=Swi+VoBo/Vp× 100%
Wherein:VoiFor the volume of non-wetted phase fluid discharged from rock core under arbitrary pressure;Vo0It is measured for non-wetted phase fluid The initial value of pipe liquid measure;BoFor volume factor of the non-wetted phase fluid (formation oil) under simulated formation pressure condition;SwiFor profit Rock core wetting phase fluid saturation when wetting phase driving starts;
Capillary force P under arbitrary wetting phase injection pressurecwi=Pwi-P0
Wherein:PwiFor arbitrary wetting phase fluid infusion pressure;P0For back pressure;
As wetting phase fluid (water phase) injects rock core wetting phase fluid saturation S when pressure increases step by stepwWith capillary force Pcwi Relation curve be force suck capillary pressure curve.
8. displacement and capillary pressure curve translocation device group is sucked under a kind of reservoir condition, including:More set triaxial stress rock core clampings Device covers non-wetted phase back pressure controller more, covers non-wetted phase pressure flow sensor group more, covers non-wetted phase fluid metering more Pipe, more set wetting phase back pressure controllers, more set wetting phase pressure flow sensor groups, more set wetting phase fluid metering pipes, more sets Non-wetted phase partly oozes partition board, more set wetting phases partly ooze partition board, and a set of constant speed and constant pressure micro pump, a set of non-wetted phase fluid piston hold Device, a set of wetting phase fluid piston container, pressure gauge, lantern ring last item press mechanical pressing pump, a set of back pressure mechanical pump, computer;Its It is characterized in that:More set triaxial stress core holding unit ring last item crimping mouths are connected to ring last item press mechanical pressing pump, triaxial stress rock core Clamper places the first fluid interface that one end that non-wetted phase partly oozes partition board is connected to non-wetted phase back pressure controller, non-wetted The pressure control interface of phase back pressure controller is connected to back pressure mechanical pump, and the second fluid interface of non-wetted phase back pressure controller connects The first fluid interface of non-wetted phase pressure flow sensor group is connected to, interface connects at the top of non-wetted phase pressure flow sensor group Non-wetted phase fluid gauge line is connect, non-wetted pressure flow sensor group second fluid interface is connected to non-wetted phase fluid piston Container top interface, non-wetted phase fluid piston container bottom interface are connected to constant speed and constant pressure micro pump;Triaxial stress rock core presss from both sides Holder, which places wetting phase and partly oozes one end of partition board, is connected to the first fluid interface of wetting phase back pressure controller, wetting phase back pressure control The pressure control interface of device processed is connected to back pressure mechanical pump, and the second fluid interface of wetting phase back pressure controller is connected to wetting phase The first fluid interface of pressure flow sensor group, wetting phase pressure flow sensor group top interface connection wetting phase fluid meter Buret, wetting pressure flow sensor group second fluid interface are connected to wetting phase fluid piston container top interface, wetting phase Fluid piston container bottom interface is connected to constant speed and constant pressure micro pump;Computer is equipped with parallel independent data acquisition line and is connected to Constant speed and constant pressure micro pump covers non-wetted phase back pressure controller more, covers independent non-wetted phase pressure flow sensor group, more sets more Independent wetting phase back pressure controller covers independent wetting phase pressure flow sensor group more.
CN201810010000.8A 2018-01-05 2018-01-05 Displacement and capillary pressure curve translocation device and method is sucked under reservoir condition CN108181224A (en)

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