CN107860896A - Silicon-aluminum bentonite ceramic fine bead prepares the well cementation test block performance test of oil well anti-gas-leak - Google Patents
Silicon-aluminum bentonite ceramic fine bead prepares the well cementation test block performance test of oil well anti-gas-leak Download PDFInfo
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- CN107860896A CN107860896A CN201711166096.9A CN201711166096A CN107860896A CN 107860896 A CN107860896 A CN 107860896A CN 201711166096 A CN201711166096 A CN 201711166096A CN 107860896 A CN107860896 A CN 107860896A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; ceramics; glass; bricks
- G01N33/383—Concrete, cement
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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
- G01N1/38—Diluting, dispersing or mixing samples
Abstract
The present invention provides a kind of Silicon-aluminum bentonite ceramic fine bead and prepares the well cementation test block performance test of oil well anti-gas-leak,By the wt% of G levels oil-well cement 40~50,The wt% of superfine cement 10~15,Particle diameter is the hollow wt% of Silicon-aluminum bentonite ceramic fine bead 25~35 of 50~250 μm of closed pores,The wt% of flyash 5~7 of loss on ignition 1.1%,Purity 99.9%,The wt% of calcium oxide 1.5~2,1~5wt% of 0.5~1.0wt% of sodium sulphate and silica flour,Obtain compound,The percentage by weight sum of above component is 100%,Compound stirs,Sized mixing with 0.5~0.7 ratio of mud,Add the aluminium foaming agent that compound gross weight is 0.2~0.5%,It is prepared into dilatant slurry,Carry out the density of dilatant slurry,Acid-base value determines,Uniformity test,Rate of change of the density is tested and anti-gas-leak performance test.
Description
Technical field
The present invention relates to Silicon-aluminum bentonite ceramic fine bead to prepare the well cementation test block performance test of oil well anti-gas-leak, belongs to material skill
Art is led.
Background technology
At present, both at home and abroad in oil well cementing, extremely-low density cement is used for HTHP oil well, but use flyash
Floating bead, compression strength is low, and cement slurry density rate of change is big, after the static solidification of cement mortar, leaks air, causes blind hole, in addition,
The ratio of the palliatives such as fly ash float must be controlled within 40%, and otherwise, palliative can influence the resistance to compression of cementing concrete test block
Intensity, the density of palliative cement briquette within 40% is in 1.2g/cm3More than, depending merely on the ratio of increase palliative reduces water
The density of mud test block is infeasible.
The content of the invention
Using modified Silicon-aluminum bentonite ceramic material as palliative, using modified Silicon-aluminum bentonite ceramic material, carry
High well cementation tries fast resistance to compression, anti-folding, high temperature resistant, corrosion resistant performance, and foaming agent is added in cement mortar, forms the slurry of expansion
Liquid, the density of slurries is reduced, reduce the pressure in shaft bottom, spawn, the matrix knot of cement mortar are generated in hydration process
Structure hole diminishes, and forms high vapour lock well cementation test block, reduces the permeability of well cementation test block, improves the flow of pore of well cementation test block
Resistance.
Prevent slurries from, because of weightlessness, being leaked air in well cementation, anti-pressure ability declines.
Its technical scheme is：
Silicon-aluminum bentonite ceramic fine bead prepares the well cementation test block performance test of oil well anti-gas-leak, comprises the following steps：
A, the preparation of the hollow Silicon-aluminum bentonite ceramic fine bead of closed pore：
The preparation of the first step, base-material：By 20~50 μm of bentonite in powder of particle diameter, 10~50 μm of silicon dioxide powders of particle diameter, 20~50 μm
Alumina powder is by weight：70~85wt%：10~20wt%：10~30wt% is sampled, and obtains mixed powder, the weight of above component
Percentage sum is 100%；
The modified firing of second step, base-material：After the first step is mixed evenly, add mixed powder gross weight 5~
8wt% also primary resins are stirred in mixer, and blank is pressed into harder, are dried 6~12 hours at 100~300 DEG C,
Insulation is fired 2~4 hours in 1500~1650 DEG C of electric reduction furnaces, obtains being modified Silicon-aluminum bentonite ceramic block by replacing reaction
Body, bentonite have strong hygroscopicity and dilatancy, and modified Silicon-aluminum bentonite physical and chemical performance is stable, alumina refractory
Performance, silica crushing resistance, fracture resistance are strong, modified Silicon-aluminum bentonite resistance to compression, anti-folding, anti-erosion, anti-aging, acidproof
Alkali, resistance to elevated temperatures improve；
The preparation of 3rd step, modified solid Silicon-aluminum bentonite ceramic fine bead：Second step is obtained into Silicon-aluminum bentonite ceramic block to exist
It is processed into the solid Silicon-aluminum bentonite ceramic fine bead of 5~50 μm of spherical shapes of particle diameter on balling machine, nodularization processing is blower fan by thing
Material is blown afloat, and the rotary motion phase mutual friction between material is in spherical particle, and uniform wall thickness, the particle of spherical shape is in each particle
Stress distribution is uniform, and compression strength is big；
It is prepared by the 4th step, modified Silicon-aluminum bentonite ceramics slurries：The percentage of Silicon-aluminum bentonite slurries forms：The μ of particle diameter 5~50
The solid wt% of Silicon-aluminum bentonite ceramic fine bead 65~70 of m：The wt% of water 30~35；
5th step, add foaming agent：Urea is added in the Silicon-aluminum bentonite ceramics slurries prepared to the 4th step, concentration is 1~3g/
L, use N2H4CO, when the temperature in stove is increased to 135 DEG C, is decomposed as foaming agent and is produced CO2And NH3, Silicon-aluminum bentonite is made pottery
Porcelain microballon volume increases；
It is prepared by the hollow Silicon-aluminum bentonite ceramic fine bead of the 6th step, closed pore：5th step mixed serum is sufficiently stirred filtering, using height
Pressure injection high speed centrifugation rotary spraying technique, forms microballoon, by de- on the oxygen-enriched combusting stove that multi-region vertical drop controls respectively
Water, expansion, high temperature sintering, melt surface vitreous, balling-up, by wind-force clean classification obtain 15~50 μm of wall thickness, particle diameter 50~
The hollow Silicon-aluminum bentonite ceramic fine bead of 250 μm of closed pores, floating bead wall thickness prepared by inorganic mineral material is artificially controllable, compression strength
It is big in 120~250MPa, the hollow Silicon-aluminum bentonite ceramic fine bead compression strength of closed pore；
B, the hollow Silicon-aluminum bentonite ceramic fine bead of closed pore prepares the well cementation test block of oil well anti-gas-leak：
The first step, the dispensing of anti-gas-leak well cementation test block：By 40~50wt% of G level oil-well cements, 10~15wt% of superfine cement, particle diameter
For 25~35wt% of the hollow Silicon-aluminum bentonite ceramic fine bead of 50~250 μm of closed pores, 5~7wt% of flyash, pure of loss on ignition 1.1%
The wt% of 99.9% calcium oxide 1.5~2,1~5wt% of 0.5~1.0wt% of sodium sulphate and silica flour, obtain compound, the weight of above component
It is 100% to measure percentage sum, and using the flyash of loss on ignition 1.1%, according to accumulation principle, flyash mainly fills up G level oil wells
Space between two kinds of material particle sizes of cement and the hollow Silicon-aluminum bentonite ceramic fine bead of closed pore, the different particle of particle diameter are tangent two-by-two
When, the gap between tangent circle is filled by flyash, G levels oil-well cement and glass microballoon grain is combined closely, but in usage amount
It should control within the specific limits, that is, control in the range of the 5~7% of gross weight, otherwise, influence the intensity of high temperature high voltage resistant test block,
Next to that the flyash generated by high temperature sintering, active, the hydration rate of slurries, the low fine coal of loss on ignition are significantly improved
Ash needs the ratio of mud small, contributes to the early strong of test block of cementing the well, the calcium hydroxide of purity 99.9%, calcium oxide purity is higher, and activity is got over
By force, hydration rate is fast, and generates gelatinous material calcium hydroxide, beneficial to the early strong of slurries, morning strong lifting of the temperature to test block
The effect wanted, the calcium hydroxide secondly generated after aquation is in alkalescence, can adjust the pH value of slurries, under weak basic condition, energy
The early strength of high temperature high voltage resistant oil-well cement is improved, sodium sulphate is a kind of fluid loss agent, and drop dehydration effect is obvious, in sodium sulphate
Sodium ion, there is counter-infiltration function, diffusion velocity is fast, slurries is separated out part water in solidification, sodium sulphate dosage is how much, right
The drop dehydration of slurries plays an important role, and is reacted using activated silica, aluminium and G level oil-well cements and generates hydrated calcium silicate gel shape
With other gels, the flow resistance in cement grout space and the pressure in space are added, reduces the sky of particle in well cementation test block
Gap, improve the structure of slurries, reduce the permeability of well cementation test block, improve the compactness and compression strength of well cementation test block；
The preparation of second step, anti-gas-leak test block dilatant slurry：Compound is mixed to get by the percentage by weight sampling of the first step, and
Compound is stirred, sized mixing with 0.5~0.7 ratio of mud, wherein ash is compound, adding compound gross weight is
0.2~0.5% aluminium foaming agent, aluminium foaming agent for aluminium powder cream, aluminium powder or aluminium compound in one kind therein, aluminium foaming agent
Generate bubble for hydration reaction, form the slurries of expansion, reduce the density of slurries, reduce pressure accordingly, activated silica, aluminium with
G level oil-well cements react generation hydrated calcium silicate gel shape material and other gels, the structure hole of cement mortar diminish, resist
The enhancing of pressure property, slurries are aspirated by liquid pump, spray the outer surface to high speed revolving drum, and producing centrifugal force in outer surface of cylinder will
Slurries are shed, and Stirring is shed in realization；
3rd step, testing performance index：
A, the measure of dilatant slurry density：The dilatant slurry for taking second step to prepare, pours into and density is weighed in fluid densitometer, expands
The density of slurries is in 0.8~1.2g/cm3Between, for the density of this slurries extremely-low density, the compression strength of test block is big, uses
Modified Silicon-aluminum bentonite ceramic material, improve the resistance to compressions of Silicon-aluminum bentonite closed pore hollow ceramic microspheres, anti-folding, anti-erosion, resist
Ageing properties, there is good thermal insulation, elasticity, wilfulness, antiacid, alkali resistant and pressure-resistant, anti-aging, antioxygenic property.
B, the measure of dilatant slurry acid-base value：The dilatant slurry for taking second step to prepare, is poured into pH value tester, shows pH
Value, the pH value of dilatant slurry is between 9.0~10.5；
C, the uniformity test of slurries：Take second step to prepare dilatant slurry and pour into settlement barrel, homogeneity is observed after 0.5 hour, surely
Qualitative, homogeneity is that the hollow Silicon-aluminum bentonite ceramic fine bead of closed pore mutually merges with slurries, and stability is no longer to float ripple up and down
Dynamic, microballon is evenly distributed in dilatant slurry；
D, the rate of change of the density experiment of test block：Second step is prepared into slurries, pours into one group of three pieces of length and width, high respectively 53mm*
In 53mm*53mm die trials, conserved respectively 24 hours, 48 hours, 96 hours, after the demoulding in the water-bath curing box of 52 DEG C of constant temperature
Soaked 1 hour in cold water, the test block after solidification is put into the enterprising line density rate of change of forcing press tests, and tries fast variable density
Rate is less than 0.02%；
E, anti-gas-leak performance test：Gas leakage occurs in slurries in process of setting, i.e., from mecystasis to the process of Solid State Transformation
In, the dilatant slurry for taking second step to prepare is poured into gas leakage analogue experiment installation, and gas leakage analogue experiment installation includes support, remote control
Oblique angle regulator, central tube, outer tube, pressurization hole, pressure tap, top cover labyrinth, lower sealing cover, the screen pack of electric digital display,
Central tube runs through outer tube, and center pipe diameter has a plurality of specifications, between 10~200 centimetres of internal diameter, is formed between central tube and outer tube
Annular space, annular space are mineshaft annulus, and central tube is provided with micropore with outer tube, by the slurries injection of expansion wherein, other parts
Rack-mount, test bracket angle of inclination is in the gap of influence of 0~90 ° of change to gas leakage, central tube and outer tube to slurry
The influence of liquid setting time and gas leakage, influence, the density of slurries influence to gas leakage of the quantity of dehydration to gas leakage drops, slurries lose
Again to gas leakage effect, hydration reaction drop dehydration is excessive, causes volume contraction excessive, and pressure is directly proportional to depth, adds from pressurization hole
Pressure, pressurization scope pressure tap access digital pressure sensor, measure the slurries static pressure that annular space expands, filtering from 1~350MPa
The online quantity provided with leak-off hole metering drop dehydration, fluid loss should be in 10~50mL/30min, and single-factor measures density, inclined respectively
The influence of oblique angle, pressure to drop dehydration, the influence of multiple-factor density, inclination angle, force combination measurement to drop dehydration, drop dehydration are more
It is few directly related with gas leakage, and record and measure test bit, drop dehydration excessively causes the space and crack of test block, prevents slurries from existing
It is weightless in solidification, cement the well test block gas leakage the reason for one of be due to cement the well test block density it is bigger, compressive load per unit area is bigger, with
Well cementation depth down, base pressure is bigger, collapses, and using expanding cement, the density of slurries is reduced, so as to reduce well
The pressure at bottom, spawn is generated in hydration process, the basal body structure hole of cement mortar diminishes, and forms high vapour lock well cementation examination
Block, the permeability of well cementation test block is reduced, improve the flow of pore resistance of well cementation test block.
The present invention has advantages below.
1st, the displacement reaction by thermal reduction, generates modified ceramic material, improves the hollow pottery of Silicon-aluminum bentonite closed pore
The performance such as the resistance to compression of porcelain microballon, anti-folding, anti-erosion, anti-aging.
2nd, using the slurries of expansion, the density of slurries is reduced, so as to reduce the pressure in shaft bottom.
3rd, activated silica, aluminium and G level oil-well cements, which react, generates hydrated calcium silicate gel shape material and other gels, water
The basal body structure hole of mud diminishes, and forms high vapour lock well cementation test block, reduces the permeability of well cementation test block, improves well cementation examination
The flow of pore resistance of block.
Brief description of the drawings
Fig. 1 is the test platform structure schematic diagram of the anti-gas-leak performance test of the embodiment of the present invention.
1, support 2, the oblique angle regulator 3 of remote control electric digital display, lower sealing cover 4, beaker 5, mistake wherein in figure
Filter screen 6, outer tube 7, central tube 8, top cover labyrinth 9, pressure tap 10, pressurization hole 11, compression pump 12, digital pressure sensing
Device.
Embodiment
Embodiment 1.
Silicon-aluminum bentonite ceramic fine bead prepares the well cementation test block performance test of oil well anti-gas-leak, comprises the following steps：
A, the preparation of Silicon-aluminum bentonite closed pore hollow ceramic microspheres：
The preparation of the first step, base-material：By 25 μm of Silicon-aluminum bentonite powder of particle diameter, 40 μm of silicon dioxide powders of particle diameter, 30 μm of alumina powders
By weight：70wt%：15wt%：15wt% is sampled, and obtains mixed powder；
The modified firing of second step, base-material：After the first step is mixed evenly, the 5wt% of mixed powder gross weight is added
Also primary resin is stirred in mixer, and blank is pressed into harder, is dried 10 hours at 150 DEG C, in 1500 DEG C of reduction electricity
Insulation is fired 4 hours in stove, obtains being modified Silicon-aluminum bentonite ceramic block, modified Silicon-aluminum bentonite chemistry by replacing reaction
Composition changes, and aluminum oxide improves Silicon-aluminum bentonite heat resistance, the increase of molecular link attraction, resistance to compression, anti-folding, resists and invades
Erosion, anti-aging, acid and alkali-resistance, resistance to elevated temperatures improve；
The preparation of 3rd step, modified solid Silicon-aluminum bentonite ceramic fine bead：Second step is obtained into Silicon-aluminum bentonite block in nodularization
The solid Silicon-aluminum bentonite ceramic fine bead of 30 μm of spherical shapes of particle diameter is processed on machine.
It is prepared by the 4th step, Silicon-aluminum bentonite ceramics slurries：The percentage of Silicon-aluminum bentonite slurry forms：30 μm of particle diameter
Solid Silicon-aluminum bentonite ceramic fine bead 70wt%：Water 30wt%.
5th step, add foaming agent：Urea is added in the Silicon-aluminum bentonite ceramics slurries prepared to the 4th step, concentration is
2.5g/L, use N2H4CO, when the temperature in stove is increased to 135 DEG C, is decomposed as foaming agent agent and is produced CO2And NH3, make ceramics
Microballon volume increases.
It is prepared by the 6th step, the modified hollow Silicon-aluminum bentonite ceramic fine bead of closed pore：5th step mixed serum was sufficiently stirred
Filter, using high-pressure injection high speed centrifugation rotary spraying technique, microballoon is formed, is passed through on the combustion furnace of multi-region vertical drop zonal control
Dehydration, expansion, high temperature sintering, melt surface vitreous, balling-up are crossed, cleaning classification by wind-force obtains wall thickness in 35 μm, particle diameter 200
μm hollow Silicon-aluminum bentonite ceramic fine bead of closed pore, more than the wall thickness of other floating beads, compression strength is in 200MPa.
B, the modified hollow Silicon-aluminum bentonite ceramic fine bead of closed pore prepares oil well anti-gas-leak test block.
The first step, the dispensing of anti-gas-leak test block：G level oil-well cements 45wt%, superfine cement 15wt%, particle diameter are 200 μm
Silicon-aluminum bentonite closed pore hollow ceramic microspheres 30wt%, loss on ignition 1.1% 20 μm of flyash 5wt% of particle diameter, the hydrogen-oxygen of purity 99.9%
Change 5 μm of calcium 2.0wt%, sodium sulphate 1.0wt% and particle diameter silica flour 2wt%, obtain compound.
The preparation of second step, anti-gas-leak test block dilatant slurry：Mixing is mixed to get by the percentage by weight sampling of the first step
Material, and compound is stirred, to be sized mixing with 0.55 ratio of mud, add aluminium powder cream, aluminium powder cream hydration reaction generates bubble,
The slurries of expansion are formed, reduce the density of slurries, activated silica, aluminium and G oil-well cements, which react, generates hydrated calcium silicate gel
Shape material and other gels, the basal body structure hole of cement mortar diminish, and slurries are aspirated by liquid pump, and high speed revolving drum is arrived in spraying
Outer surface, outer surface of cylinder produce centrifugal force slurries are shed, realization shed Stirring.
3rd step, testing performance index：
A, the measure of dilatant slurry density：Take second step to prepare slurries, pour into and density is weighed in fluid densitometer, dilatant slurry
Density is in 0.95g/cm3Between, the density of this slurries is extremely-low density, and the compression strength of test block is big, using modified sial
Bentonite ceramic material, the resistance to compression of raising Silicon-aluminum bentonite closed pore hollow ceramic microspheres, anti-folding, anti-erosion, ageing resistace.
B, the measure of dilatant slurry acid-base value：Take second step to prepare slurries, pour into pH value tester, show pH value, it is swollen
The pH value of swollen slurries is 9.5.
C, the uniformity test of slurries：Take second step to prepare dilatant slurry and pour into settlement barrel, observed after 0.5 hour homogeneous
Property, stability, homogeneity is that the hollow Silicon-aluminum bentonite ceramic fine bead of closed pore mutually merges with slurries, and stability is no longer to float up and down
Floating fluctuation, microballon are evenly distributed in the slurries of expansion.
D, the rate of change of the density experiment of test block：Second step is prepared into slurries, the slurries being stirred pour into one group of two block length,
It is wide, high to be respectively in 53mm*53mm*53mm die trials, conserved respectively in the water-bath curing box of 52 DEG C of constant temperature 24 hours, it is 48 small
When, 96 hours, soaked 1 hour in cold water after the demoulding, by the test block after solidification be put on forcing press carry out test block density become
Rate is tested.
E, the performance test of anti-gas-leak well cementation test block：The dilatant slurry for taking second step to make pours into gas leakage analogue experiment installation
In, gas leakage analogue experiment installation includes support 1, the oblique angle regulator 2 of remote control electric digital display, central tube 7, outer tube 6, pressurization
Hole 10, pressure tap 9, top cover labyrinth 8, lower sealing cover 3, screen pack 5, wherein, central tube 7 runs through outer tube 6, and central tube 7 can be changed,
Annular space is formed between central tube 7 and outer tube 6, wherein, other parts are arranged on support 1 for the slurries injection of expansion, remote control electricity
The oblique angle regulator 2 of dynamic digital display makes the angle of inclination of support 1 for 60 °, 40 centimetres of the gap of central tube 7 and outer tube 6, measurement angle
Spend the influence to grout cures, drop influence, the density of slurries influence to gas leakage of the quantity of dehydration to gas leakage, because of the sky of test block
Gap and crack cause drop dehydration it is excessive, slurries weightlessness causes compression strength to decline, and pressure is directly proportional to depth, with compression pump 11 from
Pressurization hole 10 is pressurizeed, and is pressurized to 300MPa, digital pressure sensor 12, the slurries static pressure of measurement annular space expansion, on screen pack 5
The quantity of drop dehydration is measured provided with leak-off hole, the drop dehydration in 25mL/30min, unit interval of the drop fluid loss in beaker 4 meets
Cementing requirements, single-factor measure respectively density, inclination angle, pressure to drop dehydration influence, and then influence oil well gas leakage, it is more because
The influence of sub- density, inclination angle, force combination measurement to drop dehydration, how much directly related with gas leakage drop dehydration is, test block of cementing the well
Density is bigger, and compressive load per unit area is bigger, and with well cementation depth down, base pressure is bigger, collapses, and is closed using modified
Hole hollow silicon zircon ceramic fine bead, the slurries of expansion, reduce the density of slurries, solve the weightlessness of slurries, reduce well
The pressure at bottom, spawn is generated in hydration process, the basal body structure hole of cement mortar diminishes, and forms high vapour lock well cementation examination
Block, the flow of pore resistance of well cementation test block is improved, reduce the permeability of well cementation test block, improve the hole stream of well cementation test block
Dynamic resistance.
Claims (1)
1. Silicon-aluminum bentonite ceramic fine bead prepares the well cementation test block performance test of oil well anti-gas-leak, comprise the following steps：
The first step, the dispensing of anti-gas-leak well cementation test block：By 40~50wt% of G level oil-well cements, 10~15wt% of superfine cement, particle diameter
For 50~250 μm of 25~35wt% of the hollow Silicon-aluminum bentonite ceramic fine bead of closed pore, 5~7wt% of flyash of loss on ignition 1.1%, purity
99.9% 1.5~2wt% of calcium oxide, 0.5~1.0wt% of sodium sulphate and 1~5wt% of silica flour samplings, obtain compound, above component
Percentage by weight sum is 100%；
The preparation of second step, anti-gas-leak well cementation test block dilatant slurry：Mixing is mixed to get by the percentage by weight sampling of the first step
Material, compound is stirred, sized mixing with 0.5~0.7 ratio of mud, wherein ash is compound, adds compound gross weight
For 0.2~0.5% aluminium foaming agent, aluminium foaming agent hydration reaction generates bubble, forms the slurries of expansion, reduces the density of slurries,
Activated silica, aluminium and G level oil-well cements, which react, generates hydrated calcium silicate gel shape material and other gels, adds cement mortar
The flow resistance of liquid air gap and the pressure in space, reduce the space of particle in well cementation test block, improve the structure of slurries, reduce solid
The permeability of well test block, the compactness and compression strength of well cementation test block are improved, slurries are aspirated by liquid pump, are sprayed to rotation at a high speed
Walk around the outer surface of cylinder, produce centrifugal force in outer surface of cylinder and shed slurries, Stirring is shed in realization；
3rd step, the performance test of anti-gas-leak well cementation test block：The dilatant slurry for taking second step to make pours into gas leakage simulated experiment dress
In putting, gas leakage analogue experiment installation includes support（1）, remote control electric digital display oblique angle regulator（2）, central tube（7）, it is outer
Pipe（6）, pressurization hole（10）, pressure tap（9）, top cover labyrinth（8）, lower sealing cover（3）, screen pack（5）, wherein central tube（7）Pass through
Wear outer tube（6）, central tube（7）Diameter has plurality of specifications, central tube（7）With outer tube（6）Between form annular space, by the slurries of expansion
Wherein, other parts are arranged on support for injection（1）On, switch board is provided with keyboard, changes servomotor by input parameter
Corner, and then change support（1）Angle of inclination, test bracket（1）Influence of the different angles of inclination to gas leakage, central tube
（7）With outer tube（6）Gap to the influence of grout cures time and gas leakage, influence of the quantity to gas leakage of dropping dehydration, slurries
Influence of the density to gas leakage, influence of the slurries weightlessness to gas leakage, uses compression pump（11）From pressurization hole（10）Pressurization, pressure tap（9）
Access digital pressure sensor（12）, the slurries static pressure that annular space expands is measured, simulates the pressure value of different depth, screen pack
（5）The quantity of leak-off hole metering drop dehydration is provided with, drop dehydration enters beaker（4）In, single-factor measures density, tilted respectively
The influence of angle, pressure to drop dehydration, the influence of multiple-factor density, inclination angle, force combination measurement to drop dehydration, how much is drop dehydration
It is directly related with gas leakage, and record and measure test bit, the density for test block of cementing the well is bigger, and compressive load per unit area is bigger, with solid
Well depth is deepened, and base pressure is bigger, collapses, using the modified hollow sial bentonite composite material microballon of closed pore, swollen
Swollen slurries, the density of slurries is reduced, reduce the pressure in shaft bottom, spawn is generated in hydration process, cement mortar
Basal body structure hole diminishes, and forms high vapour lock well cementation test block, reduces the permeability of well cementation test block, improves the hole of well cementation test block
Clearance flow dynamic resistance.
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