CN105295889B - A kind of preparation method of low-density and high-strength ceramsite sand proppant - Google Patents
A kind of preparation method of low-density and high-strength ceramsite sand proppant Download PDFInfo
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Abstract
The invention belongs to be applied to the proppant field of oil field fracturing, in particular to it is a kind of using in light-burned, low-grade bauxite prepare the preparation method of low-density and high-strength ceramsite sand proppant.This method with bauxite obtained after light-burned it is light-burned in, low-grade bauxite, it is raw material with clay, magnesia powder, manganese dioxide powder, it is successively milled, first time granulation, is granulated for second, is dry, being sintered, after screening step, obtain the low-density and high-strength ceramsite sand proppant.It is base stock that the present invention, which is selected by the light-burned obtained low middle grade alumyte of bauxite rawore, expands the application range of low-grade bauxite, reduces production cost；The present invention passes through granulation step twice during the preparation process, the different ceramsite propping agent of obtained inside and outside powder particle size, the proppant superior performance, has low-density, high intensity, high circularity, can be widely used in the oil fracturing of various depth.
Description
Technical field
It is the invention belongs to be applied to the proppant field of oil field fracturing, in particular to a kind of to be obtained after light-burned with bauxite
In light-burned, low-grade bauxite and clay, magnesia powder, manganese dioxide powder be raw material, low-density and high-strength haydite is prepared
The preparation method of the preparation method of sand proppant.
Background technique
With the continuous popularization of large hydraulic fracturing technique, using and implement, the exploitation of low-density and high-strength proppant at
For an important technology in fracturing technology.The reduction of proppant density, can greatly reduce the use of chemical material, and water is used in reduction
Amount reduces reservoir damage and environmental pollution, so that pressure break cost be greatly reduced.Especially opened in factory operation and shale gas
In adopting, effect is more obvious.
Fracturing technique used in massive hydraulic fracture and shale gas exploitation carries out generally in low permeability formation, to the property of proppant
Can have following requirement: (1) high-intensitive, since China's oil and gas reservoir buries relatively deeply, stratum pressure is big, it is desirable that fracturing propping agents have
Higher intensity, even if being also unlikely to deform broken in the very big situation of pressure；(2) low-density is used for massive hydraulic fracture and shale gas
Fracturing fluid viscosity used in the hydraulic fracturing technology of exploitation is low, and prop-carrying capacity is weaker, to keep proppant in low viscosity fracturing fluid
Suspendability is good, it is desirable to which proppant density is lower, this can also reduce fracturing fluid cost simultaneously；(3) sphericity, shale gas storage
Layer is fine and close, and crack is very tiny in reservoir or even agensis, and permeability is extremely low, thus needs proppant partial size smaller, sphericity
It is good, to improve shale gas flow conductivity.
It is about 1.30g/cm that existing company of foreign countries, which develops density,3Ceramsite sand, but it is at high price, be not suitable for state of China
Feelings.The country is also researching and developing always low-density ceramsite sand in recent years, but technically without substantive breakthroughs.It is primarily present following
Problem: (1) intensity is lower, and intensity also reduces while density reduces, and is only used for shallow-layer oil mining；(2) percentage of damage is big, and one
As 15%~25%；(3) density is big, requires fracturing fluid prop-carrying capacity high；(4) circularity is poor, and fracture condudtiviy is poor.
Therefore, study it is a kind of there is high intensity again while low-density, and the low fracturing propping agents of percentage of damage are current
Fracturing technology is badly in need of the key of optimization, is the key that guarantee that made crack has high flow conductivity.Low-density and high-strength proppant
It is carried without high viscosity fracturing fluid, the use of the chemical materials such as thickener, crosslinking agent can be greatly reduced, not only contribute to reduce
Fracturing material cost, and harm of the chemical addition agent to stratum and fracturing work scene can be reduced, therefore study and be suitble to
Low-density and high-strength oil fracturing ceramsite propping agent have good economy, environmental benefit.
Chinese patent application " in utilization, low-grade bauxite preparation in density proppant in high intensity method " (application number
201310486637.1, publication No. CN103525396A, date of publication on January 22nd, 2014) in the proppant production method recorded,
Using obtained after bauxite it is light-burned in, low-grade bauxite and clay, magnesia powder, manganese dioxide powder be raw material, according to
It is secondary be granulated, dried, is sintered, being cooled down, screening process, obtain density proppant in high intensity in 20~40 purposes.This method
Defect are as follows: handled merely through primary granulation, obtained small product size density is higher, is 1.67~1.79g/cm3；And product is strong
Spend limited, percentage of damage is just up to 3.5% under 69MPa pressure.
Therefore, it needs to improve the production method of proppant in oil field fracturing field at present, obtains a kind of less dense, higher
The proppant of intensity is applied to oil field operation.
Summary of the invention
In view of the deficiencies of the prior art, the purpose of the present invention is to provide a kind of low-density and high-strength ceramsite sand proppants
Preparation method, this method with bauxite obtained after light-burned it is light-burned in, low-grade bauxite and clay, magnesia powder, titanium dioxide
Manganese powder is raw material, is successively milled, first time granulation, is granulated for second, is dry, being sintered, after screening step, obtained described low
Density high-strength ceramsite sand proppant.This method is using low middle grade alumyte as raw material, and by granulation step twice, what is obtained is interior
The different ceramsite propping agent of outer powder particle size has low-density and high intensity.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of preparation method of low-density and high-strength ceramsite sand proppant, the light-burned middle grade obtained after light-burned with bauxite
Bauxite, light-burned low-grade bauxite and clay, magnesia powder, manganese dioxide powder are raw material, are successively milled, for the first time
It is granulated, is granulated for second, is dry, being sintered, after screening step, obtain the low-density and high-strength ceramsite sand proppant, it is specific to wrap
Include following steps:
Light-burned step:
By Al2O3The bauxite rawore that mass percentage is 65~72% carries out light-burned processing 1 at 800~1000 DEG C
~3h forms light-burned middle grade alumyte；By Al2O3The bauxite rawore that mass percentage is 45~50% is 950~1100
1~3h of light-burned processing is carried out at DEG C, forms light-burned low-grade bauxite；
Be milled step:
Each raw material, the light-burned middle grade alumyte 88~95%, clay 2~5%, magnesia powder are weighed in the following proportions
0.5~2%, manganese dioxide powder 2~6% obtains raw material A after mixing processing；
Each raw material, the light-burned low-grade bauxite 88~95%, clay 2~5%, magnesia powder are weighed in the following proportions
0.5~2%, manganese dioxide powder 2~6% obtains raw material B after mixing processing；
The raw material A, raw material B are subjected to milling processing respectively, obtain fine powder that raw material A is worn into and raw material B wear into it is thin
Powder；
First time granulation step:
The fine powder that the raw material A is worn into carries out first time granulation processing, obtains the base ball of raw material A formation；
Second of granulation step:
The fine powder that the base ball and the raw material B formed with the raw material A is worn into carries out second of granulation processing, obtains particle
Green compact；
Drying steps:
The particle green compact are dried, the semi-finished product after being dried；
Sintering step:
Semi-finished product after the drying are sintered at 1320~1360 DEG C, and keep the temperature 0.5~2h, obtain high temperature
Sintered product；
Screening step:
Product after the high temperature sintering is cooling until 60 DEG C hereinafter, progress screening process, it is high to obtain the low-density
Intensity ceramsite sand proppant
Further, Al in the clay2O3Mass percentage be 26~35%, SiO2Mass percentage be
49~68%, the preferably mild-clay of Sichuan.
Further, the MgO mass percentage of the magnesia powder is 65~85%, preferably light-magnesite powder.
Further, the MnO of the manganese dioxide powder2Mass percentage be 45~62%, preferably industrial dioxy
Change manganese powder.
Further, the granularity for the fine powder that the raw material A is worn into is 500~800 mesh, the fine powder that the raw material B is worn into
Granularity is 300~500 mesh.
Further, the milling step has been distinguished in the light-burned middle grade alumyte, light-burned low-grade bauxite
At what is carried out on the basis of break process；Light-burned middle grade alumyte, the light-burned low-grade bauxite for completing break process
Partial size be 1~4mm.
Further, in the first time granulation step, the granularity for the base ball that the raw material A is formed is 30~50 mesh.
Further, in second of granulation step, the granularity of the particle green compact is 18~35 mesh.
Further, the granularity of the low-density and high-strength ceramsite sand proppant is 20~40 mesh.
Further, in the drying steps, 2.5~5h dry prior to 50~80 DEG C of the first drying temperature, then at second
90~120 DEG C of 7~10h of drying of drying temperature, until the mass percentage of moisture is less than or equal to 3%.
Further, in the screening step, the cooling treatment are as follows: carry out the product after the high temperature sintering air-cooled straight
60 DEG C are down to hereinafter, carrying out again air-cooled to temperature.
The present invention has the advantages that compared with prior art
1, because it is base stock that the present invention, which is selected by the light-burned obtained low middle grade alumyte of bauxite rawore, expand
The big application range of low-grade bauxite, reduces production cost.
2, because the present invention during the preparation process pass through second of granulation step, obtained particle green compact include base layers of balls and
Surrounding layer, which is the surface texture with the round and smooth protrusion of systematicness, so the intensity of the proppant can be promoted.
3, because the present invention is during the preparation process by granulation step twice, the different haydite of obtained inside and outside powder particle size
Proppant, so the proppant increases substantially intensity while reducing density, have superior performance: bulk density is small
In equal to 1.35g/cm3, apparent density is less than or equal to 2.65g/cm3, grain size specification is 20~40 mesh, percentage of damage under 69MPa pressure
Less than 3.0%, circularity is more than or equal to 0.9, and sphericity is more than or equal to 0.9, which has low-density, high intensity, high circularity, energy
It is widely used in the oil fracturing of various depth.
Detailed description of the invention
Fig. 1 is the flow chart of technical solution of the present invention.
Fig. 2 is the structural schematic diagram for the particle green compact that second of granulation step is formed.1: base layers of balls, 2: surrounding layer.
Specific embodiment
As shown in Figure 1, a kind of preparation method of low-density and high-strength ceramsite sand proppant, with bauxite tcrude ore it is light-burned after
Obtained light-burned middle grade alumyte, light-burned low-grade bauxite and clay, magnesia powder, manganese dioxide powder is raw material, successively
It is milled, first time granulation, is granulated for second, is dry, being sintered, after screening step, obtain low-density and high-strength ceramsite sand branch
Agent is supportted, is specifically comprised the following steps:
Light-burned step:
By Al2O3The bauxite rawore that mass percentage is 65~72% is (in addition to Al2O3Outside, remaining is SiO2、Fe2O3、
The impurity such as MgO) carry out 1~3h calcination processing at 800~1000 DEG C after, form light-burned middle grade alumyte；By Al2O3Quality
The bauxite rawore that percentage composition is 45~50% is (in addition to Al2O3Outside, remaining is SiO2、Fe2O3, the impurity such as MgO) 950~
After carrying out light-burned processing 1~3h calcination processing at 1100 DEG C, light-burned low-grade bauxite is formed；
Be milled step:
This step be on the basis of light-burned middle grade alumyte, light-burned low-grade bauxite are respectively completed break process into
Capable；Complete the light-burned middle grade alumyte of break process, the partial size of light-burned low-grade bauxite is that (for example partial size exists 1~4mm
In 1mm, 2mm, 3mm, 4mm etc. any completion break process between the two it is light-burned in, low-grade bauxite).
Weigh light-burned middle grade alumyte 88~95% in the following proportions, clay 2~5%, magnesia powder 0.5~2%, two
Manganese powder 2~6% is aoxidized, obtains raw material A after mixing processing；Light-burned low-grade bauxite 88~95% is weighed in the following proportions, is glued
Soil 2~5%, magnesia powder 0.5~2%, manganese dioxide powder 2~6% obtain raw material B after mixing processing；The above substance is matter
Measure percentage；
Raw material A, raw material B are being subjected to milling processing respectively, ground homogenizing, is obtaining the original that granularity is 500~800 mesh
Fine powder that material A is worn into (for example granularity is both any in 500 mesh, 550 mesh, 600 mesh, 650 mesh, 700 mesh, 750 mesh, 800 mesh etc.
Between fine powder) and granularity be 300~500 mesh raw material B wear into fine powder (such as granularity 300 mesh, 350 mesh, 400 mesh,
Any fine powder between the two in 450 mesh, 500 mesh etc.)；
In the above raw material, Al in clay2O3Mass percentage be 26~35%, SiO2Mass percentage be 49
~68%, the preferably mild-clay of Sichuan；Magnesia powder refers to that the mass percentage of MgO is 65~85% oxygen
Change magnesium powder, is preferably the light-magnesite powder of raw material preparation using Haicheng City magnesite；Manganese dioxide powder refers to MnO2Quality
The manganese dioxide powder that percentage composition is 45~62%, preferably commercial silica manganese powder.
First time granulation step:
First time granulation is carried out using granulating disc, the fine powder that raw material A is worn into is added in disk, to disk rotational
Afterwards, atomized water is uniformly sprayed on the fine powder surface；Complete atomized water to be painted, disk rotational for a period of time after, formed exhibiting high surface it is wet
The parent nucleus of profit, is then sprinkled into dry powder, i.e. the fine powder worn into of raw material A, and base ball is made to grow up；It repeats alternately to spray into atomized water and spread
Enter the fine powder that raw material A is worn into, base ball is made to continue to grow up, until granularity needed for reaching: 30~50 mesh obtain the base of raw material A formation
Ball；
In first time granulation process, partial size base ball needed for needing shaking-sieving to obtain, by the base ball of not up to required granularity
Repeat the granulation step；
Second of granulation step:
For the base ball formed using raw material A as mother bulb, the fine powder worn into using raw material B is secondary in granulating disc to make as raw material
Grain (is added the base ball that raw material A is formed i.e. in disk uniformly to spray into atomized water after disk rotational in the base ball surface, make original
The surface wettability for expecting A shape ceramic ball, is then sprinkled into the fine powder that raw material B is worn into, base ball is made to grow up；It repeats alternately to spray into atomization
Water and be sprinkled into the fine powder that raw material B is worn into), until base ball grows up to required granularity: 18~35 mesh obtain particle green compact；
In second of granulation process, partial size base ball needed for also needing shaking-sieving to obtain, by the base of not up to required granularity
Ball repeats the granulation step；
The partial size for the fine powder that raw material B is worn into is larger, is uniformly wrapped on base ball, preferably forms round and smooth prominent with systematicness
The surface texture risen, the size of protrusion are related with Jacket thickness, it is desirable that and rounding protrusion is uniformly significantly distributed in base ball surface,
It can estimate and be observed.As shown in Fig. 2, the internal layer of particle green compact are as follows: base layers of balls 1 is the base ball that raw material A is formed；Particle green compact
Outer layer are as follows: surrounding layer 2, the surrounding layer 2 be it is that the fine powder worn into of raw material B is formed, there is the round and smooth protrusion of systematicness, the surrounding layer
2 are wrapped in outside base layers of balls 1.
Current hydraulic fracturing is circle with the basic configuration of ceramsite sand proppant, and the grain shape of proppant, surface
Property has a significant impact the macromechanics of granule, and (Wang Guixuan, the Qin build the discrete element of quick granular materials mechanical property to document
Numerical simulation [J] University Of Dalian journal, 2008,28 (6): 27-31.) point out that the intensity of oval granular materials is higher than circle,
And there is the structure of the round and smooth protrusion of systematicness to be equivalent to the combination of several oval particles on surface, be more advantageous to mentioning for intensity
It rises.In the present embodiment, the particle green compact formed are granulated by second, the surface texture with the round and smooth protrusion of systematicness, into one
Step illustrates that surface texture has large effect to ceramsite sand proppant strength.
Drying steps:
Particle green compact are dried in drying box, 2.5~5h dry prior to 50~80 DEG C of the first drying temperature,
Drying is obtained until the mass percentage of moisture is less than or equal to 3% then at 90~120 DEG C of 7~10h of drying of the second drying temperature
Semi-finished product afterwards；
Sintering step:
Semi-finished product after drying are sintered at 1320~1360 DEG C, and keep the temperature 0.5~2h, obtain high temperature sintering
Product afterwards；
Screening step:
Product after high temperature sintering is first carried out it is air-cooled, until temperature be down to 60 DEG C hereinafter, carry out again it is air-cooled (i.e. will be air-cooled
Product after high temperature sintering afterwards is placed in air)；Shaking-sieving processing is carried out again, obtains the low-density high-strength of 20~40 mesh
Spend ceramsite sand proppant；
Embodiment 1:
By Al2O3The bauxite rawore that mass percentage is 65~72% carries out 3h calcination processing at 800~900 DEG C
Afterwards, light-burned middle grade alumyte is formed；By Al2O3Mass percentage is 1000~1100 DEG C of bauxite rawore of 45~50%
After the lower light-burned processing 2h calcination processing of progress, light-burned low-grade bauxite is formed.
Light-burned middle grade alumyte that above-mentioned calcination processing obtains, light-burned low-grade bauxite are subjected to broken place respectively
Reason；The partial size of the light-burned middle grade alumyte, light-burned low-grade bauxite of completing break process is 1~2mm.
Each raw material is weighed according to the following ratio, and is uniformly mixed respectively:
Raw material A: light-burned middle grade alumyte 89%, clay 5%, magnesia powder 2%, manganese dioxide powder 4%；
Raw material B: light-burned low-grade bauxite 93%, clay 1.5%, magnesia powder 0.5%, manganese dioxide powder 5%.
It obtains according to said ratio by raw material A and raw material B, is carried out grinding homogenizing respectively, raw material A obtains 500~650
Mesh fine particle, raw material B obtain 400~500 mesh fine particles；In the fine powder investment granulating disc that raw material A is worn into first,
Spray into atomized water to the dry fine powder, after parent nucleus is formed, by alternately spraying into atomized water and be sprinkled into dry fine powder, make base ball grow up to
30~50 mesh；Using above-mentioned base ball as masterbatch, the raw material B fine powder worn into is coated on its outer layer, second is carried out and is granulated, be granulated
At rear 18~35 mesh of mistake, particle green compact are obtained；Particle green compact are placed in drying box and are dried, prior to 70 DEG C dry 4h,
Then at 100 DEG C of drying 8h, make moisture content≤3.0% of particle；Dry semi-finished product are sintered and are kept the temperature under 1340 DEG C of high temperature
2h；It is placed on air hollow cold, then shaking-sieving product again for first air-cooled to 60 DEG C of product or less after high temperature sintering, obtains 20~40
Purpose low-density and high-strength ceramsite sand supports agent product.The small product size density of the present embodiment is less than or equal to 1.35g/cm3, apparent density
For less than or equal to 2.65g/cm3, grain size specification is 20~40 mesh, and percentage of damage is 2.7% under 69MPa pressure, and circularity is more than or equal to
0.9, sphericity is more than or equal to 0.9, and the test method of the circularity and sphericity is according to " SY/T 5108-2006 fracturing propping agents performance refers to
Mark and test recommended method " it carries out.
Embodiment 2:
By Al2O3The bauxite rawore that mass percentage is 65~72% carries out 2h calcination processing at 900~950 DEG C
Afterwards, light-burned middle grade alumyte is formed；By Al2O3Mass percentage is at 950~1000 DEG C of bauxite rawore of 45~50%
After carrying out light-burned processing 3h calcination processing, light-burned low-grade bauxite is formed.
Light-burned middle grade alumyte that above-mentioned calcination processing obtains, light-burned low-grade bauxite are subjected to broken place respectively
Reason；The partial size of the light-burned middle grade alumyte, light-burned low-grade bauxite of completing break process is 2~3mm.
Each raw material is weighed according to the following ratio, and is uniformly mixed respectively:
Raw material A: light-burned middle grade alumyte 90%, clay 2%, magnesia powder 2%, manganese dioxide powder 6%；
Raw material B: light-burned low-grade bauxite 95%, clay 2%, magnesia powder 1%, manganese dioxide powder 2%；
Raw material A and raw material B are subjected to grinding homogenizing respectively, raw material A obtains 600~750 mesh fine particles, and raw material B is obtained
300~400 mesh fine particles；In the fine powder investment granulating disc that raw material A is worn into first, atomization is sprayed into the dry fine powder
Water, by alternately spraying into atomized water and being sprinkled into dry fine powder, makes base ball grow up to 30~50 mesh after parent nucleus is formed；With above-mentioned base
Ball is masterbatch, and the raw material B fine powder worn into is coated on its outer layer, carries out second and is granulated, and crosses 18~35 meshes after the completion of being granulated,
Obtain particle green compact；Particle green compact are placed in drying box and are dried, prior to 60 DEG C dry 5h make then at 90 DEG C of drying 9h
Moisture content≤3.0% of particle；Dry semi-finished product are sintered under 1360 DEG C of high temperature and keep the temperature 2h；Product is first after high temperature sintering
Air-cooled to 60 DEG C or less are placed on air hollow cold, then shaking-sieving product again, obtain the low-density and high-strength pottery of 20~40 mesh
Granule supports agent product.The small product size density of the present embodiment is less than or equal to 1.35g/cm3, apparent density is less than or equal to 2.65g/
cm3, grain size specification is 20~40 mesh, and percentage of damage is 2.9% under 69MPa pressure, and circularity is more than or equal to 0.9, and sphericity is more than or equal to
0.9, test method foundation " the SY/T 5108-2006 fracturing propping agents performance indicator and test recommendation side of the circularity and sphericity
Method " it carries out.
Embodiment 3:
By Al2O3The bauxite rawore that mass percentage is 65~72% carries out 1h calcination processing at 900~1000 DEG C
Afterwards, light-burned middle grade alumyte is formed；By Al2O3Mass percentage is at 950~1000 DEG C of bauxite rawore of 45~50%
After carrying out light-burned processing 2.5h calcination processing, light-burned low-grade bauxite is formed.
Light-burned middle grade alumyte that above-mentioned calcination processing obtains, light-burned low-grade bauxite are subjected to broken place respectively
Reason；The partial size of the light-burned middle grade alumyte, light-burned low-grade bauxite of completing break process is 2~4mm.
Each raw material is weighed according to the following ratio, and is uniformly mixed respectively:
Raw material A: light-burned middle grade alumyte 95%, clay 2%, magnesia powder 1%, manganese dioxide powder 2%；
Raw material B: light-burned low-grade bauxite 90%, clay 2%, magnesia powder 2%, manganese dioxide powder 6%；
Raw material A and raw material B are subjected to grinding homogenizing respectively, raw material A obtains 500~800 mesh fine particles, and raw material B is obtained
300~500 mesh fine particles；In the fine powder investment granulating disc that raw material A is worn into first, atomization is sprayed into the dry fine powder
Water, by alternately spraying into atomized water and being sprinkled into dry fine powder, makes base ball grow up to 30~50 mesh after parent nucleus is formed；With above-mentioned base
Ball is masterbatch, and the raw material B fine powder worn into is coated on its outer layer, carries out second and is granulated, and crosses 18~35 meshes after the completion of being granulated,
Obtain particle green compact；Particle green compact are placed in drying box and are dried, prior to 70 DEG C dry 4h make then at 110 DEG C of drying 7h
Moisture content≤3.0% of particle；Dry semi-finished product are sintered under 1360 DEG C of high temperature and keep the temperature 2h；Product is first after high temperature sintering
Air-cooled to 60 DEG C or less are placed on air hollow cold, then shaking-sieving product again, obtain the low-density and high-strength pottery of 20~40 mesh
Granule supports agent product.The small product size density of the present embodiment is less than or equal to 1.35g/cm3, apparent density is less than or equal to 2.65g/
cm3, grain size specification is 20~40 mesh, and percentage of damage is 2.5% under 69MPa pressure, and circularity is more than or equal to 0.9, and sphericity is more than or equal to
0.9, test method foundation " the SY/T 5108-2006 fracturing propping agents performance indicator and test recommendation side of the circularity and sphericity
Method " it carries out.
Embodiment 4:
By Al2O3The bauxite rawore that mass percentage is 65~72% carries out at 2.5h calcining at 800~900 DEG C
After reason, light-burned middle grade alumyte is formed；By Al2O3The bauxite rawore 1050~1100 that mass percentage is 45~50%
After carrying out light-burned processing 1h calcination processing at DEG C, light-burned low-grade bauxite is formed.
Light-burned middle grade alumyte that above-mentioned calcination processing obtains, light-burned low-grade bauxite are subjected to broken place respectively
Reason；The partial size of the light-burned middle grade alumyte, light-burned low-grade bauxite of completing break process is 3~4mm.
Each raw material is weighed according to the following ratio, and is uniformly mixed respectively:
Raw material A: light-burned middle grade alumyte 92%, clay 4%, magnesia powder 1%, manganese dioxide powder 3%；
Raw material B: light-burned low-grade bauxite 92%, clay 4%, magnesia powder 1%, manganese dioxide powder 3%；
Raw material A and raw material B are subjected to grinding homogenizing respectively, raw material A obtains 500~800 mesh fine particles, and raw material B is obtained
300~500 mesh fine particles；In the fine powder investment granulating disc that raw material A is worn into first, atomization is sprayed into the dry fine powder
Water, by alternately spraying into atomized water and being sprinkled into dry fine powder, makes base ball grow up to 30~50 mesh after parent nucleus is formed；With above-mentioned base
Ball is masterbatch, and the raw material B fine powder worn into is coated on its outer layer, carries out second and is granulated, and crosses 18~35 meshes after the completion of being granulated,
Obtain particle green compact；Particle green compact are placed in drying box and are dried, prior to 70 DEG C dry 4h make then at 100 DEG C of drying 8h
Moisture content≤3.0% of particle；Dry semi-finished product are sintered under 1340 DEG C of high temperature and keep the temperature 2h；Product is first after high temperature sintering
Air-cooled to 60 DEG C or less are placed on air hollow cold, then shaking-sieving product again, obtain the low-density and high-strength pottery of 20~40 mesh
Granule supports agent product.The small product size density of the present embodiment is less than or equal to 1.35g/cm3, apparent density is less than or equal to 2.65g/
cm3, grain size specification is 20~40 mesh, and percentage of damage is 2.5% under 69MPa pressure, and circularity is more than or equal to 0.9, and sphericity is more than or equal to
0.9, test method foundation " the SY/T 5108-2006 fracturing propping agents performance indicator and test recommendation side of the circularity and sphericity
Method " it carries out.
Claims (13)
1. a kind of preparation method of low-density and high-strength ceramsite sand proppant, it is characterised in that: obtained after light-burned with bauxite
Light-burned middle grade alumyte, light-burned low-grade bauxite and clay, magnesia powder, manganese dioxide powder are raw material, are successively ground
After powder, for the first time granulation, second of granulation, dry, sintering, screening step, obtains the low-density and high-strength ceramsite sand and support
Agent specifically comprises the following steps:
Light-burned step:
By Al2O3The bauxite rawore that mass percentage is 65~72% carries out 1~3h of light-burned processing at 800~1000 DEG C,
Obtain light-burned middle grade alumyte；By Al2O3The bauxite rawore that mass percentage is 45~50% is at 950~1100 DEG C
1~3h of light-burned processing is carried out, light-burned low-grade bauxite is obtained；
Be milled step:
Each raw material, the light-burned middle grade alumyte 88~95%, clay 2~5%, magnesia powder 0.5 are weighed in the following proportions
~2%, manganese dioxide powder 2~6% obtains raw material A after mixing processing；
Each raw material, the light-burned low-grade bauxite 88~95%, clay 2~5%, magnesia powder 0.5 are weighed in the following proportions
~2%, manganese dioxide powder 2~6% obtains raw material B after mixing processing；
The raw material A, raw material B are subjected to milling processing respectively, obtain the fine powder that raw material A is worn into and the fine powder that raw material B is worn into；
Wherein, the granularity for the fine powder that the raw material A is worn into is 500~800 mesh, and the granularity for the fine powder that the raw material B is worn into is 300
~500 mesh, and the granularity of fine powder worn into of the raw material A is different from the granularity for the fine powder that the raw material B is worn into；
First time granulation step:
The fine powder that the raw material A is worn into carries out first time granulation processing, obtains the base ball of raw material A formation；
Second of granulation step:
The fine powder that the base ball and the raw material B formed with the raw material A is worn into carries out second of granulation processing, and it is raw to obtain particle
Base；The internal layer of the particle green compact is base layers of balls, is the base ball that the raw material A is formed；The outer layer of the particle green compact is outsourcing
Layer, the surrounding layer be it is that the fine powder worn into of the raw material B is formed, there is the round and smooth protrusion of regularity；
Drying steps:
The particle green compact are dried, the semi-finished product after being dried；
Sintering step:
Semi-finished product after the drying are sintered at 1320~1360 DEG C, and keep the temperature 0.5~2h, obtain high temperature sintering
Product afterwards；
Screening step:
By the product cooling treatment after the high temperature sintering until 60 DEG C hereinafter, progress screening process, it is high to obtain the low-density
Intensity ceramsite sand proppant.
2. the preparation method of low-density and high-strength ceramsite sand proppant as described in claim 1, it is characterised in that: in the clay
Al2O3Mass percentage be 26~35%, SiO2Mass percentage be 49~68%.
3. the preparation method of low-density and high-strength ceramsite sand proppant as claimed in claim 2, it is characterised in that: the clay is
The mild-clay of Sichuan.
4. the preparation method of low-density and high-strength ceramsite sand proppant as described in claim 1, it is characterised in that: the magnesia
The MgO mass percentage of powder is 65~85%.
5. the preparation method of low-density and high-strength ceramsite sand proppant as claimed in claim 4, it is characterised in that: the magnesia
Powder is light-magnesite powder.
6. the preparation method of low-density and high-strength ceramsite sand proppant as described in claim 1, it is characterised in that: the titanium dioxide
The MnO of manganese powder2Mass percentage be 45~62%.
7. the preparation method of low-density and high-strength ceramsite sand proppant as described in claim 1, it is characterised in that: the titanium dioxide
Manganese powder is commercial silica manganese powder.
8. the preparation method of low-density and high-strength ceramsite sand proppant, feature exist as described in any one of Claims 1 to 4
In: the milling step is to be respectively completed the base of break process in the light-burned middle grade alumyte, light-burned low-grade bauxite
It is carried out on plinth；The light-burned middle grade alumyte of the completion break process, the partial size of light-burned low-grade bauxite are 1~4mm.
9. the preparation method of low-density and high-strength ceramsite sand proppant, feature exist as described in any one of Claims 1 to 4
In: in the first time granulation step, the granularity for the base ball that the raw material A is formed is 30~50 mesh.
10. the preparation method of low-density and high-strength ceramsite sand proppant as claimed in claim 9, it is characterised in that: described second
In secondary granulation step, the granularity of the particle green compact is 18~35 mesh.
11. the preparation method of low-density and high-strength ceramsite sand proppant, feature exist as described in any one of Claims 1 to 4
In: in the drying steps, 2.5~5h dry prior to 50~80 DEG C of the first drying temperature, then at the second drying temperature 90~120
DEG C drying 7~10h, until the mass percentage of moisture be less than or equal to 3%.
12. the preparation method of low-density and high-strength ceramsite sand proppant, feature exist as described in any one of Claims 1 to 4
In: in the screening step, the cooling treatment are as follows: carry out the product after the high temperature sintering air-cooled until temperature is down to 60
DEG C hereinafter, carrying out again air-cooled.
13. the preparation method of low-density and high-strength ceramsite sand proppant, feature exist as described in any one of Claims 1 to 4
In: the granularity of the low-density and high-strength ceramsite sand proppant is 20~40 mesh.
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| CN107151554A (en) * | 2016-03-03 | 2017-09-12 | 中国科学院过程工程研究所 | For riverfrac treatment or the Superlight ceramsites proppant and preparation method of anhydrous pressure break |
| CN106278174B (en) * | 2016-07-25 | 2019-03-22 | 邯郸市马头盛火陶瓷有限公司 | A kind of Lightweight ceramsite proppant, preparation and application and shale oil gas recovery method |
| CN107267135A (en) * | 2017-06-30 | 2017-10-20 | 周远华 | A kind of proppant and preparation method thereof |
| CN109053203A (en) * | 2018-10-17 | 2018-12-21 | 山东金璞新材料有限公司 | A method of casting model powder is prepared using aluminous fly-ash, gangue as raw material |
| CN110628411B (en) * | 2019-09-24 | 2022-01-11 | 大唐同舟科技有限公司 | Low-density petroleum fracturing propping agent and preparation method thereof |
| CN112065354A (en) * | 2020-05-28 | 2020-12-11 | 中国海洋石油集团有限公司 | Modification process of perforation fracturing structure under offshore loose sandstone sieve tube well completion mode |
| CN112877054A (en) * | 2021-01-12 | 2021-06-01 | 中国石油天然气股份有限公司 | Self-suspending proppant and preparation method thereof |
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