CN108562468A - For to there are the methods and core holding unit that the rock core of high infiltration strip carries out saturated oils - Google Patents
For to there are the methods and core holding unit that the rock core of high infiltration strip carries out saturated oils Download PDFInfo
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- CN108562468A CN108562468A CN201810197080.2A CN201810197080A CN108562468A CN 108562468 A CN108562468 A CN 108562468A CN 201810197080 A CN201810197080 A CN 201810197080A CN 108562468 A CN108562468 A CN 108562468A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2873—Cutting or cleaving
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/364—Embedding or analogous mounting of samples using resins, epoxy
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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Abstract
It is a kind of to be used for there are the methods and core holding unit that the rock core of high infiltration strip carries out saturated oils.Main purpose is to solve the problems, such as that conventional substrate high infiltration strip rock core can not be led to not carry out related experiment by abundant saturated oils.It is characterized in that：When to carrying out saturated oils there are the rock core of high infiltration strip, being used in the liquid of saturation and being divided at least front, middle part and three paths of rear portion according to the sequence that flows through of matrix, high infiltration strip and matrix perpendicular to the plane where high infiltration strip and flow through.The present invention solves the problems, such as that conventional substrate high infiltration strip rock core is unable to fully saturated oils and leads to not carry out related experiment, so that related matrix high infiltration strip core oil-displacement test is smooth, the percolation law in the displacement process of matrix high infiltration strip can be further evaluated, the development of laboratory experiment basic research is contributed to.
Description
Technical field：
The present invention is under the jurisdiction of oil-gas field development field, satisfies particularly with regard to a kind of rock core to there are high infiltration strip
With the apparatus and method of oil.
Background technology：
The actual reservoir in China oil field is developed to form the predominant pathways such as macropore and high infiltration strip by long-term injecting, at present
The level of technical monitoring can not be monitored all, also be cannot achieve whole transfer drives and blocked, and no matter lead to high infiltration strip objective reality
On in plane or longitudinal direction, the case where displacement remaining oil, is more universal in the case of matrix-high infiltration strip, can prepare routine at present
The one-dimensional column rock core of column, centre lay high infiltration strip, but indoors test saturated oils when there is saturated oils problem because intermediate
Partial permeability is big, and fat oil is flowed out from middle section when saturated oils, is caused both sides base portion to be unable to fully be saturated, is made
Obtaining subsequent experimental can not carry out, and lead to not carry out matrix-high infiltration strip evaluation study.
Invention content：
The technical issues of in order to solve to be previously mentioned in background technology, the present invention provide a kind of for there are high infiltration strips
Rock core carries out the method and core holding unit of saturated oils, and it is fully saturated that matrix high infiltration strip rock core may be implemented using this method
Oil, to carry out effective Displacement Efficiency or percolation law research.
The technical scheme is that：This kind is used for there are the methods that the rock core of high infiltration strip carries out saturated oils, solely
Special place is:When to carrying out saturated oils there are the rock core of high infiltration strip, the liquid of saturation is used according to matrix, high infiltration strip
It is flowed through perpendicular to the plane where high infiltration strip with the sequence that flows through of matrix.
To realize that the liquid for saturation can flow through sequence perpendicular to hypertonic item according to matrix, high infiltration strip and matrix
Plane with place flows through, and needs to meet claimed below：
Matrix-high infiltration strip rock core is placed horizontally in the core holding unit with built-in gum cover, the rock core clamping
It needs to be provided with axial rings indentation mouth on device and radial ring is pressed into mouth and is made to form pressure with realizing the water filling to outside built-in gum cover
Gum cover is close to the cylindrical surface of built-in rock core；It needs to be provided at least three saturated liquid arrival ends and three on the core holding unit
Saturated liquid outlet end, so that for making the liquid that rock core is saturated after arrival end entrance, it can be at least through the head of rock core
End, middle part and the outflow of three paths of tail end；
When placement, firstly, it is necessary to ensure the high infiltration strip of the matrix-high infiltration strip rock core and the radial ring indentation mouth
In same level, and the horizontal plane is the plane by the core holding unit central axis；
Secondly, therefore, to assure that the upside matrix of the matrix-high infiltration strip rock core and the position of downside matrix correspond to respectively
Saturated liquid arrival end on the core holding unit and saturated liquid outlet end；
The saturated liquid arrival end and 90 degree of interval of ring indentation mouth angle of circumference are laid, the saturated liquid arrival end
It is laid with saturated liquid outlet end 180 degree angle of circumference.
To implement preceding method, following core holding units are provided：Core holding unit includes chassis and hollow cylinder shape
Main body, main body are built-in with gum cover.Wherein, radial ring is pressed into mouth, the radial direction ring there are one being opened in the core holding unit main body
Mouth is pressed into for the radial water filling into main body along core holding unit main body, so that gum cover is close to rock core cylindrical surface by building the pressure；
It is counterclockwise spaced at the position of 90 degree of angles of circumference with the radial ring indentation mouth and is provided at least three saturated liquid injection end,
It is provided with the extraction of at least three saturated liquid being spaced clockwise at the position of 90 degree of angles of circumference with the radial ring indentation mouth
End；The saturated liquid injection end and saturated liquid production end are located across on the same section plane of main center's axis；Institute
Saturated liquid injection end and saturated liquid production end are stated, is distributed in front, middle part and the tail of the core holding unit main body in pairs
Portion；
Liquid stream is provided on the gum cover, at the position of the corresponding saturated liquid injection end and saturated liquid production end to pass through
Hole, the liquid stream through hole connect with saturated liquid injection end control valve and the sealing of saturated liquid production end control valve respectively by the road
It connects；
The core holding unit further includes the gland positioned at main body left and right ends；The gland includes gland main body, axial direction
Ring pressure pipe, ebonite plug, soft rubber stopper and axial rings pressure control valve；Wherein, it is provided with external screw thread in gland main body, core holding unit
Main body both ends are provided with internal thread, and gland main body, which is connected through a screw thread, to be screwed in main body；The gland main body by the ebonite plug and
Soft rubber stopper compresses successively, to realize that the soft rubber stopper is touched with the rock core in main body；The axial rings pressure pipe is embedded in the pressure
The external opening end of lid body interior, the axial rings pressure pipe is connect with axial rings pressure control valve.
The present invention has the advantages that：The solution of the present invention is by when preparing matrix high infiltration strip rock core
Require high infiltration strip being laid in inside matrix rock core according to experimental simulation, by compacting, drying, cut, drill through, rounding is completed
Rock core makes.The artificial core to complete is placed in saturated oils in special core holding unit.During saturated oils, the rock
Heart clamp holder can be such that crude oil passes through perpendicular to high infiltration strip seepage flow in artificial core front, middle part, tail portion, make crude oil and matrix,
High infiltration strip comes into full contact with, to realize the fully saturated oil of matrix high infiltration strip rock core.It is hypertonic that the present invention solves conventional substrate-
Band rock core is unable to fully saturated oils and leads to not the problem for carrying out related experiment so that related matrix-high infiltration strip rock core drives
Oil experiment is smooth, and effective displacement of reservoir oil effect can be carried out with the matrix high infiltration strip column rock core of the fully saturated oil
Fruit evaluates or percolation law research, can further evaluate the percolation law in the displacement process of matrix-high infiltration strip, contribute to room
The development of interior experiment basis research.
Description of the drawings：
Fig. 1 is the structural schematic diagram of matrix of the present invention-high infiltration strip rock core.
Fig. 2 is the main structure diagram of core holding unit of the present invention.
Fig. 3 is the overlooking structure diagram of core holding unit of the present invention.
Fig. 4 is the injection PV numbers-recovery ratio graph of relation obtained in the specific embodiment of the invention.
Specific implementation mode：
The invention will be further described below in conjunction with the accompanying drawings：
This kind for there are the method that the rock core of high infiltration strip carries out saturated oils, being unique in that:It is high to existing
When the rock core of infiltration strip carries out saturated oils, the liquid for being used in saturation hangs down according to the sequence that flows through of matrix, high infiltration strip and matrix
Directly flowed through in the plane where high infiltration strip.To realize that the liquid for saturation can be according to matrix, high infiltration strip and matrix
It flows through sequence to flow through perpendicular to the plane where high infiltration strip, needs to meet claimed below：
Matrix-high infiltration strip rock core is placed horizontally in the core holding unit with built-in gum cover, the rock core clamping
It needs to be provided with axial rings indentation mouth on device and radial ring is pressed into mouth and is made to form pressure with realizing the water filling to outside built-in gum cover
Gum cover is close to the cylindrical surface of built-in rock core；It needs to be provided at least three saturated liquid arrival ends and three on the core holding unit
Saturated liquid outlet end, so that for making the liquid that rock core is saturated after arrival end entrance, it can be at least through the head of rock core
End, middle part and the outflow of three paths of tail end；
When placement, firstly, it is necessary to ensure the high infiltration strip of the matrix-high infiltration strip rock core and the radial ring indentation mouth
In same level, and the horizontal plane is the plane by the core holding unit central axis；
Secondly, therefore, to assure that the upside matrix of the matrix-high infiltration strip rock core and the position of downside matrix correspond to respectively
Saturated liquid arrival end on the core holding unit and saturated liquid outlet end；
The saturated liquid arrival end and 90 degree of interval of ring indentation mouth angle of circumference are laid, the saturated liquid arrival end
It is laid with saturated liquid outlet end 180 degree angle of circumference.
For implement above method, spy provide for there are the rock core of high infiltration strip carry out saturated oils core holding unit,
Such as shown in Fig. 2 and painting, this kind of clamper includes the main body 17 of chassis 21 and hollow cylinder shape, and main body 17 is built-in with gum cover 18.
Wherein, it is opened in the core holding unit main body there are one radial ring indentation mouth 20, the radial direction ring indentation mouth is used to press from both sides along rock core
The radial water filling into main body of holder main body, makes gum cover be close to rock core cylindrical surface by building the pressure；It is being pressed into mouth with the radial ring
It is counterclockwise spaced at the position of 90 degree of angles of circumference and is provided at least three saturated liquid injection end, be pressed into the radial ring
Mouth is spaced at the position of 90 degree of angles of circumference and is provided at least three saturated liquid production end clockwise；The saturated liquid injection
End and saturated liquid production end are located across on the same section plane of 17 central axis of main body；The saturated liquid injection end and
Saturated liquid production end is distributed in front, middle part and the tail portion of the core holding unit main body in pairs.
Liquid stream is provided on the gum cover, at the position of the corresponding saturated liquid injection end and saturated liquid production end to pass through
Hole, the liquid stream through hole are close with saturated liquid injection end control valve 15 and saturated liquid production end control valve 16 respectively by the road
Envelope connection；
The core holding unit further includes the gland positioned at main body left and right ends；The gland includes gland main body 9, axis
To ring pressure pipe 10, ebonite plug 11, soft rubber stopper 12 and axial rings pressure control valve 13.Wherein, it is provided with external screw thread in gland main body 9,
17 both ends of main body of core holding unit are provided with internal thread, and gland main body 9, which is connected through a screw thread, to be screwed in main body 17；The gland master
Body compresses the ebonite plug and soft rubber stopper successively, to realize that the soft rubber stopper is touched with the rock core in main body 17；The axial direction
Ring pressure pipe is embedded in the gland body interior, and external opening end and the axial rings pressure control valve 13 of the axial rings pressure pipe connect
It connects.
The detailed case and step of the specific implementation present invention is given below：
Step 1：According to practical reservoir mesostroma permeability to be simulated and high infiltration strip permeability and depth information,
Determine one-dimensional rock core size.Using rock core compacting tool set and pressure testing machine, prepared using quartz sand resin compacting gluing method
Experiment rock core；
1) according to the practical geologic feature of reservoir, matrix and the permeability and thickness of high infiltration strip are determined, determines one made
Tie up the overall size of rock core；2) prepare compacting tool set；According to the suitably long side plate of rock core size selection and short side plate and by its with it is each
Component splicing assembling.Long side plate and short side plate nested encryptions, are both embedded on the groove of pedestal, and solid by fixed link
It is fixed.When to be pressed, pressing plate is placed in above material.The length of the long side plate is 35-37cm, width 1-1.5cm, height
Degree is 13-14cm.The length of the short side plate is 30-30.5cm, and width is that 1-1.5cm is consistent with long side plate, is highly
13-14cm is consistent with long side plate.The length of the pressing plate is 29.8-30cm, width 29.8-30cm, is highly 13-
16cm.The length of the pedestal is 40-44cm, width 35-38cm, is highly 1-1.5cm.3) prepare material；According to matrix
The parameters such as the porosity of rock core and high infiltration strip rock core, permeability, size distribution, gluing agent content determine two kinds of physics moulds respectively
Quartz sand mesh number and quality used in type.4) it is die-filling to rub sand with the hands；By the quartz sand for determining mesh number quality and a certain amount of epoxy resin
Mixing, is packed into ready compacting tool set after mixing, in the mold bottom uniformly distributed matrix rock core object of thickness as requested
Material, three layers of laying of quartz sand point, first layer are matrix rock core, and the second layer is high infiltration strip rock core, and third layer is matrix rock core.It will
After material is dispersed evenly to mold, pressing plate is placed in above material.5) it suppresses；Lay the quartz sand of first layer matrix rock core
After grain, pressing pressure and time are set, operating pressure testing machine pressurizes to compacting tool set, and materials inside is made to shape.It is to be pressed
After the completion, pressing plate is laid down, it is in the matrix rock core top uniformly distributed high infiltration strip rock core material of thickness as requested, material is uniform
After interspersing among mold, pressing plate is placed in above material, sets pressing pressure and time, operating pressure testing machine is to compacting tool set
Pressurization, makes materials inside shape.Pressing plate is laid down after the completion of to be pressed, by matrix rock core material according to wanting on high infiltration strip rock core
It asks thickness uniformly distributed, pressing plate is placed in above material later, set pressing pressure and time, operating pressure testing machine is to pressure
Molding jig pressurizes, and materials inside is made to shape.6) exposed rock core drying；The exposed rock core suppressed is placed in a timing in insulating box
Between, prepare cutting after to be dried.7) exposed rock core cutting.With cutting machine by the exposed rock core of drying according to matrix rock core and hypertonic
Band cylinder rock core length dimension is cut, and drill bit is used in combination to drill through, the matrix high infiltration strip cylinder rock core met the size requirements,
As shown in Figure 1, figure label 7 is matrix rock core, label 8 is high infiltration strip.
Step 2：Prepare special corresponding core holding unit A and corresponding gum cover：1) core holding unit main body is prepared；
The core holding unit main body is internal diameter 31-33mm, and outer diameter is the hollow cylinder of 36-38mm.Have thereon lateral
Ring presses arrival end.There are 3 injection ends and 3 production ends at away from 90 ° of positions of lateral ring pressure arrival end circumference.The lateral ring pressure
Arrival end be can inside water filling, so that gum cover is close to rock core cylindrical surface by building the pressure, to make rock core fasten.The injection end has 3
It is a, can simulation oil be injected into rock core simultaneously in front, middle part, tail portion.The production end has 3, corresponds to perpendicular to injection end,
The fluid in clamper is set to flow out.The production end and injection end cooperate, and can make simulation oil is vertical to pass through rock core, and then make base
Matter rock core and Qi Nei high infiltration strip rock cores come into full contact with simulation oil, achieve the purpose that fully to be saturated.2) gland is prepared；Gland is by pressing
Lid main body, axial rings pressure pipe, ebonite plug, soft rubber stopper and axial rings pressure control valve and external screw thread composition.Gland main body is by outer
Screw thread and the internal thread at core holding unit main body both ends can screw in core holding unit, and one end of gland main body is connected with ebonite
Plug, ebonite plug are connected with soft rubber stopper later.Rock core in soft rubber stopper and rock core aid device is in direct contact.Axial rings pressure pipe is embedded in
Gland body interior is connected with axial rings pressure control valve.The gland is located at rock core aid device main body transverse ends, can machinery pressure
Tight ebonite plug and soft rubber stopper, and match with axial rings pressure pipe and close seal rubber sleeve, the effect of axial looper pressure.Wherein, the axial direction
Ring pressure pipe can close axial rings pressure control valve to its interior water filling when building the pressure and reaching 3MPa, so by compress ebonite plug and
Flexible glue thrusts artificial core looper pressure, plays fastening rock core.The ebonite plug has stronger bearing capacity, can further make
Soft rubber stopper is close to rock core.The soft rubber stopper by the mechanical compaction of gland and ring pressure pipe build the pressure compression and artificial core is close to,
And artificial core is made to seal fastening in the horizontal.3) gum cover is prepared.The gum cover has in injection end and production end corresponding position
Aperture can pass freely through for liquid, and these apertures are tightly connected with the control valve of injection end and production end, and gum cover makes material
Material is rubber.
Step 3：Matrix high infiltration strip rock core vacuumizing, the saturated water that will be made in step 1, are loaded into invention later
The special core holding unit A made in step 2 carries out saturated oils to rock core.Specific path is：1) it will be made in inventive step one
The matrix high infiltration strip rock core of work is chosen 2 pieces and its quality of scale and is recorded on electronic scale respectively；2) by matrix high infiltration strip rock core
It is placed in vacuum tank, simulated formation water is added to not rock core upper surface 2-4cm excessively, sealed vacuum tank；3) vacuum pump is opened, is waited for true
When not occurring bubble in slack tank, vacuum pump is closed；4) rock core in vacuum tank is taken out, claims its weight in wet base respectively and records, calculates rock
Heart pore volume and porosity, completion vacuumize, saturated water test；5) the matrix high infiltration strip rock core after saturated water is placed in spy
The core holding unit A of matter connects saturated oils experimental provision；6) displacement pump is opened, flow velocity is set, starts saturated oils, waits for production end
Stop experiment after not being discharged；7) metering extraction water volume, calculates the initial oil saturation of rock core.
Step 4：Prepare and connect displacement of reservoir oil experimental provision, starts oil displacement experiment, and according to experimental data to each displacing agent
Its percolation law is evaluated or studied to oil displacement efficiency.Specific path is：1) prepare displacing agent, and be loaded into piston container,
The rock core of saturated oils in inventive step three is packed into conventional rock core holder B, looper compresses solid rock core；2) connection displacement test dress
It sets；3) displacement pump is opened, displacement flow rate pump is set, injects displacing agent according to experimental program；4) record injection at regular intervals
Pressure, Produced Liquid oil pump capacity and water yield, and calculate moisture content and stage recovery percent of reserves；5) according to quality evaluation of the experimental data matrix-
Percolation law in the case of high infiltration strip exists.
An EXPERIMENTAL EXAMPLE of the invention in certain oil field G blocks is given below：For reservoir based on sandstone, average effective is thick
3.6m is spent, physical property is preferable, and a high infiltration strip, permeability 1023*10 are contained in the middle part of reservoir-3μm2；Being averaged for high infiltration strip both sides is oozed
Saturating rate is 539*10-3μm2, average pore is 35% or so.Sand grains psephicity is general, based on argillaceous agglutination, cementation type
It is cementing for contact.Development has calcareous band in layer of sand, inside contain Ostracods, and be mingled with shale band, have
Various oil-bearing occurrence.It is full of oil, rich oil-bearing occurrence occupies thick oil pay；And oil-containing, oil immersion occupy oil sheet and off-balancesheet layer.It should
Block moisture content after waterflooding development 30 years reaches 98%, and water drive stage recovery percent of reserves is 37.8%.Next, being opened with the reservoir
The simulation of heat condition is as embodiment.
Step 1：According to practical reservoir mesostroma permeability to be simulated and high infiltration strip permeability and depth information,
Determine one-dimensional rock core size.Using rock core compacting tool set and pressure testing machine, prepared using quartz sand resin compacting gluing method
Experiment rock core；
1) according to the practical geologic feature of reservoir, determine that the permeability of matrix rock core is 539*10-3μm2, thickness 8mm, height
The permeability of infiltration strip is 1023*10-3μm2, the overall size of thickness 9mm, the determining one-dimensional rock core made are long 100mm, directly
Diameter 25mm；
2) prepare compacting tool set；
The length for choosing (1) long side plate is 36cm, width 1cm, is highly 13.5cm.Choose the length of (2) short side plate
It is highly 13.5cm for 30cm, width 1cm.The length for choosing (6) pedestal is 40cm, and width 36cm is highly
1.2cm.The length for choosing pressing plate is 29.8cm, width 29.8cm, is highly 14cm.Long side plate and short side plate nested encryptions,
It is both embedded on the groove of pedestal, and is fixed by (4) fixed link.When to be pressed, (5) pressing plate is placed in above material.
3) prepare material；
Matrix rock core：Choose 50 mesh quartz sand 287g, 80 mesh quartz sand 3806g, 270 mesh quartz sand 6634g, 340 mesh stones
Sand 3185g.High infiltration strip rock core：50 mesh quartz sand 221g, 80 mesh quartz sand 3385g, 270 mesh quartz sand 6950g are chosen,
340 mesh quartz sand 3564g.
4) it is die-filling to rub sand with the hands；
Extracting epoxy resin 1348g, alcohol 2g, ethylenediamine 102g, by three after mixing respectively with two types rock core
Quartz sand be mixed and stirred for rub with the hands sand, after quartz sand particle uniformly it is cementing after be packed into compacting tool set, be used in combination sieve plate to strike off.Quartz sand
It is matrix rock core to divide three layers of laying, first layer, and the second layer is high infiltration strip rock core, third layer position matrix rock core.Quartz sand particle
After being dispersed evenly to compacting tool set, pressing plate is placed in above material.
5) it suppresses；
The quartz sand particle laying depth of first layer matrix rock core is 9mm, and it is 6MPa, retention time to set pressing pressure
For 20min, operating pressure testing machine pressurizes to compacting tool set, and materials inside is made to shape.After the completion of to be pressed, pressing plate is laid down,
The uniformly distributed high infiltration strip rock core material 9mm in matrix rock core top, after material is dispersed evenly to mold, material is placed in by pressing plate
Top sets pressing pressure as 3MPa, and retention time 20min, operating pressure testing machine gives compacting tool set to pressurize, and makes interior
Portion's material setting.Pressing plate is laid down after the completion of to be pressed, by the matrix uniformly distributed 9mm of rock core material on high infiltration strip rock core, it
Pressing plate is placed in above material afterwards, it is 6MPa to set pressing pressure, and retention time 20min, operating pressure testing machine is to pressure
Molding jig pressurizes, and materials inside is made to shape.
6) exposed rock core drying；
The exposed rock core suppressed is placed in 48h in insulating box, prepares cutting after to be dried.
7) exposed rock core cutting.
The exposed rock core of drying is cut according to matrix high infiltration strip cylinder rock core length dimension 100mm with cutting machine, and
According to matrix rock core both sides it is that 8mm thickness drills through with drill bit, is met the size requirements the base of (long 100mm, diameter 25mm)
Matter high infiltration strip cylinder rock core.
Step 2：Prepare special corresponding core holding unit A and corresponding gum cover；
1) core holding unit main body is prepared；
Core holding unit main body is internal diameter 32mm, and outer diameter 37mm, length is the hollow cylinder of 30cm.Have thereon lateral
Ring presses arrival end.There are 3 injection ends and 3 production ends at away from 90 ° of positions of lateral ring pressure arrival end circumference.
2) gland is prepared；
Gland is located at rock core aid device main body transverse ends, can mechanical compaction ebonite plug and soft rubber stopper, and match with ring pressure pipe
Close seal rubber sleeve, the effect of lateral looper pressure.
Gland is made of gland main body, axial rings pressure pipe, ebonite plug, soft rubber stopper, axial rings pressure control valve and external screw thread.Pressure
Lid main body can screw in core holding unit, one end of gland main body by the internal thread at external screw thread and core holding unit main body both ends
It is connected with ebonite plug, soft rubber stopper is connected with after ebonite plug.Rock core in soft rubber stopper and rock core aid device is in direct contact.Axial rings
Pressure pipe is embedded in gland body interior and is connected with axial rings pressure control valve.
3) gum cover is prepared.
Gum cover complement bore diameter is 25mm, outer diameter 32mm, length 15cm.Note corresponding with core holding unit main body in it
Adopt a diameter of 8mm in end seepage flow hole.
Step 3：Matrix high infiltration strip rock core vacuumizing, the saturated water that will be made in step 1, are loaded into invention later
The special core holding unit A made in step 2 carries out saturated oils to rock core；
1) the matrix high infiltration strip rock core made in inventive step one is chosen into 2 pieces of its quality of scale on electronic scale respectively,
1-1 core qualities are 84.36g, and 1-2 core qualities are 85.21g；
2) matrix high infiltration strip rock core is placed in vacuum tank, addition simulated formation water to not rock core upper surface 3cm excessively,
Sealed vacuum tank；
3) vacuum pump is opened, when there is not bubble in vacuum tank, closes vacuum pump；
4) rock core in vacuum tank is taken out, it is 101.64g, rock core hole hole to claim its weight in wet base, 1-1 rock core weight in wet bases respectively
Degree is 35.27%；1-2 rock core weight in wet bases are 102.75g, porosity 35.8%.Completion vacuumizes, saturated water test；
5) the matrix high infiltration strip rock core after saturated water is placed in the core holding unit A of speciality, looper presses 3MPa, connection full
With oily experimental provision, 3 injection ends and 3 production ends all connect；
6) displacement pump is opened, flow velocity is set, opens each pipe-line control valve door and start saturated oils, stop after production end is not discharged
Only test；
7) metering extraction water volume, calculates the initial oil saturation of rock core.1-1 rock core saturated oils 12.27mL, initially contain
Oily saturation degree is 71%；1-2 rock core saturated oils 12.63mL, initial oil saturation are 72%.
Step 4：Prepare and connect displacement of reservoir oil experimental provision, starts oil displacement experiment, and according to experimental data to each displacing agent
Its percolation law is evaluated or studied to oil displacement efficiency.Experimental program such as the following table 1：
1 experimental program of table
1) prepare simulated formation water and it is common in divide polymer solution (a concentration of 1000mg/L), and be loaded into corresponding
Piston container；This experiment chooses 1-1 rock cores and is packed into conventional rock core holder B, and looper presses 3MPa；
2) displacement test device is connected；
3) displacement pump is opened, displacement flow rate pump is set as 0.3mL/min, injects displacing agent according to experimental program；
4) injection pressure, Produced Liquid oil pump capacity and water yield are recorded every 10min, and calculates moisture content and stage extraction journey
Degree；
5) experimental result is as shown in table 2 below, and injection PV numbers-recovery ratio graph of relation is as shown in figure 4, according to experimental data
Evaluate percolation law in the case of matrix-high infiltration strip exists.
Table 2
As shown in Figure 4, water drive stage, water drive stage recovery percent of reserves gradually rise with the increase of injection PV numbers, but increase
Width gradually slows down, and illustrates that water drive has progressivelyed reach the displacement limit.Polymer flooding stage, the sleeping note of polymer flooding stage recovery percent of reserves
The increase for entering PV numbers increases comparatively fast, and amplification first increases and slows down afterwards, and illustrating polymer, effect is best in the early stage, has played profile control work
With to mid-term, polymer solution progresses into high infiltration strip, and recovery percent of reserves raising slows down, and the profile control in later stage, high infiltration strip is complete
At again recovery percent of reserves is gradually increasing.In the subsequent waterflooding stage, since the viscosity of water is small, Flooding Efficiency is poor, and the subsequent waterflooding stage adopts
Go out degree to tend towards stability.
Claims (3)
1. a kind of for there are the methods that the rock core of high infiltration strip carries out saturated oils, it is characterised in that:To there are high infiltration strips
Rock core when carrying out saturated oils, be used in the liquid of saturation and flowing through sequence perpendicular to height according to matrix, high infiltration strip and matrix
Plane where infiltration strip flows through.
2. according to claim 1 for there are the methods that the rock core of high infiltration strip carries out saturated oils, it is characterised in that:
To realize that the liquid for saturation can flow through sequence where high infiltration strip according to matrix, high infiltration strip and matrix
Plane flows through, and needs to meet claimed below：
Matrix-high infiltration strip rock core is placed horizontally in the core holding unit with built-in gum cover, on the core holding unit
It needs to be provided with axial rings indentation mouth and radial ring is pressed into mouth and makes gum cover to realize the water filling to outside built-in gum cover to form pressure
It is close to the cylindrical surface of built-in rock core；It needs to be provided at least three saturated liquid arrival ends and three saturations on the core holding unit
Liquid outlet end so that for make rock core be saturated liquid from arrival end entrance after, can at least through rock core head end, in
Portion and the outflow of three paths of tail end；
When placement, firstly, it is necessary to ensure that the high infiltration strip of the matrix-high infiltration strip rock core is in the radial ring indentation mouth
In same level, and the horizontal plane is the plane by the core holding unit central axis；
Secondly, therefore, to assure that described in the upside matrix of the matrix-high infiltration strip rock core and the position of downside matrix correspond to respectively
Saturated liquid arrival end on core holding unit and saturated liquid outlet end；
The saturated liquid arrival end and 90 degree of mouth interval of ring indentation angle of circumference are laid, and the saturated liquid arrival end and are satisfied
It is laid with liquid outlet end interval 180 degree angle of circumference.
3. for there are the core holding units that the rock core of high infiltration strip carries out saturated oils, including chassis（21）And hollow cylinder
The main body of shape（17）, main body（17）It is built-in with gum cover（18）, it is characterised in that：
Radial ring is pressed into mouth there are one being opened in the core holding unit main body（20）, the radial direction ring indentation mouth along rock core for pressing from both sides
The radial water filling into main body of holder main body, makes gum cover be close to rock core cylindrical surface by building the pressure；It is being pressed into mouth with the radial ring
It is counterclockwise spaced at the position of 90 degree of angles of circumference and is provided at least three saturated liquid injection end, be pressed into the radial ring
Mouth is spaced at the position of 90 degree of angles of circumference and is provided at least three saturated liquid production end clockwise；The saturated liquid injection
End and saturated liquid production end are located across main body（17）On the same section plane of central axis；The saturated liquid injection end
With saturated liquid production end, it is distributed in front, middle part and the tail portion of the core holding unit main body in pairs；
On the gum cover, it is provided with liquid stream through hole at the position of the corresponding saturated liquid injection end and saturated liquid production end,
The liquid stream through hole by the road respectively with saturated liquid injection end control valve（15）With saturated liquid production end control valve（16）
It is tightly connected；
The core holding unit further includes the gland positioned at main body left and right ends；The gland includes gland main body（9）, axial rings
Pressure pipe（10）, ebonite plug（11）, soft rubber stopper（12）And axial rings pressure control valve（13）；Wherein, gland main body（9）On be provided with it is outer
Screw thread, the main body of core holding unit（17）Both ends are provided with internal thread, gland main body（9）It is connected through a screw thread screw-in main body（17）
It is interior；The gland main body compresses the ebonite plug and soft rubber stopper successively, to realize the soft rubber stopper and main body（17）Interior rock
The heart touches；The axial rings pressure pipe is embedded in the gland body interior, the external opening end of the axial rings pressure pipe and axial direction
Ring pressure control valve（13）Connection.
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