CN109337667A - A kind of preparation method of overlay film proppant - Google Patents
A kind of preparation method of overlay film proppant Download PDFInfo
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- CN109337667A CN109337667A CN201811159634.6A CN201811159634A CN109337667A CN 109337667 A CN109337667 A CN 109337667A CN 201811159634 A CN201811159634 A CN 201811159634A CN 109337667 A CN109337667 A CN 109337667A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/80—Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open
- C09K8/805—Coated proppants
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Abstract
The invention belongs to for drilling or the mixture field of drilling well, specifically disclose a kind of preparation method of overlay film proppant, include the following steps: that (1) prepares following raw material: aggregate, polyalcohols resin, phenolic resin, phenolic resin curing agent, isocyanate resin, catalyst and amines additives, wherein the hydroxyl equivalent of polyalcohols resin is 60-300, and isocyanate resin mass fraction is the 2/5-4/5 of the amount of polyalcohols resin；(2) it heats；(3) mulling；(4) first time overlay film；(5) second of overlay film: (6) shake out.It can be suspended naturally in clear water with proppant prepared by the preparation method, while the pressure break index for meeting conventional proppants, not need to add any thickener in fracturing process, reduce pressure break cost, simplify fracturing technology, reduce the pollution to environment.
Description
Technical field
The present invention relates to for drilling or the mixture field of drilling well, and in particular to a kind of preparation side of overlay film proppant
Method.
Background technique
In order to develop deep-seated oil, gas well, yield is improved, hydraulic fracturing technology is widely used.Hydraulic fracturing technology is benefit
With the high pressure pump group on ground, the fracturing fluid with viscosity higher is injected constantly into oil well by pit shaft, so that oil well lower part shape
At a kind of technology of high pressure.With the continuous injection of fracturing fluid, pressure is also constantly increased, the formation rock anti-tensile near the borehole wall
When intensity and reservoir stress are less than the pressure that fracturing fluid is formed, the stratum near shaft bottom will just generate crack.When carrying proppant
Fracturing fluid continue injection when, formation fractures can extend forward and be supported agent filling, stop the agent of fracturing work rear support
Play a part of equilibrium strata pressure, make rock seam keep split and have certain flow conductivity, thus reach make oil gas field volume increase,
Extend the purpose of the oil/gas well length of service.
Fracturing propping agents strut underground deep layer pressure-break effectively, and highly important effect is played in oil-gas mining,
It is one of the critical material for influencing hydraulic fracturing technology implementation result.Ideal fracturing propping agent for oil gas well, it is desirable that have high
Carrying capacity and high sand ratio, it is therefore desirable to alap density and intensity as high as possible.Traditional fracturing propping agents intensity
Greatly, but density is also high, and suspension is poor, is easy precipitating, it is not easy to be carried into well.In order to more effectively make pressure break branch
The target position that agent reaches well is supportted, needs to prepare carrying liquid during pressure break.Carrying liquid is to add water using water as main carriers
Soluble macromolecular and other amines additives reduce the frictional resistance for carrying liquid to increase the viscosity for carrying liquid.It is applying
Fracturing propping agents and carrying liquid mixing during work, in highly viscous carrying liquid, fracturing propping agents suspend wherein, in this way
It can pump farther.
Country's fracturing technology also has part to prepare proppant using coating technique at present, and one layer is generally all only covered in overlay film
Film, in overlay film, resin used is mostly epoxy resin or phenolic resin.Also there is part proppant using two layers of coating technique, inside
After layer epoxy resin or coating phenolic resin, then in outer layer polyurethane resin overlay film.Polyurethane resin is one great
System is to be reacted to be formed with hydroxyl by isocyanate group.
The effect for being currently used for the polyurethane resin of proppant overlay film is to improve the hardness of proppant and reduce proppant
Percentage of damage, but this proppant only meets the requirement of intensity and hardness, still cannot be from suspending.It is still needed when construction
The carrying liquid with viscoelasticity is prepared again, this construction method makes pressure break at high cost, and it is serious to reservoir damage, exist to environment
Pollution.
Summary of the invention
The purpose of the present invention is to provide a kind of preparation method of overlay film proppant, which can hang naturally in clear water
It is floating, while the pressure break index for meeting conventional proppants, does not need to add any thickener in fracturing process, reduce
Pressure break cost simplifies fracturing technology, reduces the pollution to environment.
In order to achieve the above objectives, base case of the invention is as follows: a kind of preparation method of overlay film proppant, including as follows
Step:
(1) prepare following raw material: aggregate, polyalcohols resin, phenolic resin, phenolic resin curing agent, isocyanates
Resin, catalyst and amines additives, wherein the hydroxyl equivalent of polyalcohols resin is 60-300, isocyanate resin mass parts
Number is the 2/5-4/5 of the amount of polyalcohols resin；
(2) it heats: the aggregate in step (1) is heated to 180-230 DEG C；
(3) mulling: the aggregate in step (2) is added in mulling pot with the revolving speed mulling of 70-100 turns/min；
(4) first time overlay film: the phenolic resin in step (1) is added in mulling pot；It is down to mulling pot temperature
The phenolic resin curing agent in step (1) is added at 150-200 DEG C；
(5) second of overlay film: polyalcohols resin and catalyst are added when the temperature of mulling pot is down to 80-130 DEG C；
Amines additives are added at 70-110 DEG C；Isocyanate resin is added at 60-100 DEG C；
(6) it shakes out: shaking out at 40-70 DEG C.
Using having the beneficial effect that for this base case:
1. using two layers of overlay film in this programme, polyurethane resin and amines additives are used in outer film coating, in overlay film
Polyurethane resin can produce nanoscale protrusion in the process, and protrusion extends in the surface of proppant particles, and protrusion will increase branch
The buoyancy of agent is supportted, while when proppant and water contact, a kind of reserved group in surface can react rapidly with water to be released largely
Gas molecules, these gas molecules or are enclosed in resin film to expand against resin membrane body stage and thicken and increase support
The equivalent diameter of agent granule, or be attached to the extension of proppant surface stage or be gathered in proppant resin film and contacted with water body
Interface on formed one layer package proppant particles body gas blanket, this gas blanket formation stages between proppant particles body
It is connected to and the result closed causes simple grain proppant to form more loose cotton-wool in water body to gather shape, be greatly lowered in this way
The relative density of proppant in water, so as to make proppant suspend in water.When proppant moves in water, proppant
Protrusion on resin film can reduce the proppant rate of settling in water；Part is settled down to the proppant of water bottom accumulation because of its tree
The more protrusion in adipose membrane surface reduces the degree of packing of proppant particles stack layer, the more conventional granulation mass of intergranular water body amount
Product body is more, and then when water body can more easily push its congeries to separate and mobile the fluidity with very little, real
Existing proppant preferably suspends in water.
2. outermost resin generate nano grade air bubbles can intensity to outermost resin and percentage of damage have an impact, make outer layer tree
The percentage of damage of the strength reduction of rouge, proppant increases.Therefore to aggregate using overlay film, outermost resin ensure the branch twice in this programme
Support agent can suspend, and inner layer resin can guarantee the integral strength of proppant, reduce the percentage of damage of proppant.
3. the proppant in this programme is when in use, pre- in macromolecule in polyurethane resin when outermost resin and water contact
The group and water stayed, which reacts rapidly, generates a large amount of gas molecules, these gas molecules are attached to the surface of proppant particles
The gas wrapping hydrated sheath of micro/nano level is formed, while the resin membrane swelling on surface can be caused, and amines additives can increase
The reactivity of polyurethane resin and water improves the suspension effect of proppant.
4. the proppant in this programme can suspend in clear water, without changing the density of water, tradition is replaced to press with clear water
Split liquid, realize zero addition of load fluid thickener in fracturing work, so save conventional pressure break with liquid process and equipment, together
When, the removal of thickener also reduces injury and pressure break cost of the pressure break to reservoir.
5. using phenolic resin and phenolic resin curing agent in this programme when inner film coating, the cost of phenolic resin compares epoxy
Resin and polyurethane resin it is low, the proppant prepared with phenolic resin is at low cost.
6. the hydroxyl equivalent of polyalcohols resin is 60-300, the quality of isocyanate resin is polyalcohols resin quality
2/5-4/5.Inventor has found that the amount of polyalcohols resin and isocyanate resin is controlled in above range by many experiments
When interior, the performance of the polyurethane resin and existing polyurethane resin of synthesis is different.Because of polyalcohols resin and different
Cyanate ester resin can react the polyurethane resin for generating and having micro protrusion, then add amines additives, can be to polyalcohol
Catalytic action is played in resinoid and isocyanate resin reaction, makes to generate a large amount of mutually isolated bubbles inside polyurethane resin.
Because bubble is located inside polyurethane resin, bubble will form a large amount of protrusion on polyurethane resin surface, these protrusions
Size is between 100-500nm, and for protrusion in proppant surface random distribution, protrusion finds that mind is dark in surface sweeping electricity microscopic observation
Be that light color is highlighted or white curved body on the resin membrane body of color, the surface resin film of single particle body have heterogencity with
Machine distribution, then calculating is that the surface of every 100 square micron under homogeneous distribution state has 40 or so protrusions, improves it and suspends certainly
Performance.In addition, the hydroxyl equivalent of polyalcohols resin is 60-300, the quality of isocyanate resin is the 2/ of polyalcohols resin
5-4/5；On the one hand the isocyanate resin of above-mentioned mass number can generate polyurethane resin with whole polyalcohols resin reactions
Afterwards, it is also reserved with a certain amount of isocyanate-reactive group, after remaining isocyanate groups meet water, is reacted with water and meeting
Gas is generated in the microcosmic small space body that the chain element of resin film surrounds, this small quantity gas is under the promotion of reaction energy
Gradually overall volume forms bubble, and resin film is pushed to increase in the radial dimension of proppant particles, makes outer resin layer surface
Dilation reaches most preferably, to further decrease the apparent density and volume density of proppant, the amount of another aspect isocyanate resin
When excessive, the bubble volume generated quantity that is too big and being easy breakage or bubble can be made to make to contact with each other between bubble too much
Lead to the strength reduction of bubble.So the amount control of isocyanate resin is within the above range, the outstanding of proppant can be both guaranteed
Floating effect, and can guarantee the intensity of proppant.
Further, the mass fraction of each raw material is as follows in step (1): 80-120 parts of aggregate, 0.25-5 parts of phenolic resin；
The mass fraction of polyalcohols resin is 0.15-3.2 parts；The amount of phenolic resin curing agent accounts for the 1/10-1/ of the amount of phenolic resin
2, wherein polyurethane resin is synthesized by polyalcohols resin and isocyanate resin, and the amount of catalyst is the 1/ of polyurethane resin
, the amount of amines additives is the 1/100-1/5 of polyurethane resin.Inventor has found through test of many times, in use
The proppant for stating the raw material preparation of mass fraction is good from suspension effect.
Further, the aggregate is haydite.Good, corrosion-resistant, the high temperature resistant using the proppant sphericity that haydite is aggregate production,
It is high pressure resistant.
Further, the phenolic resin curing agent is hexamethylenetetramine.Inventor has found by test of many times, in use
State that proppant suspension effect that raw material is phenolic resin curing agent production is more preferable and cost is relatively low.
Further, the amines additives are diethylenetriamine, triethylamine, ethamine, ethylenediamine, one in triethylene tetramine
Kind is several.Inventor uses above-mentioned aminated compounds to suspend for the proppant that amines additives make through test of many times discovery
Effect is more preferable and cost is relatively low.
Further, the catalyst is the mixture of alkyls tin compound and alkyls lead compound.Inventor is through more
Secondary test discovery, using the mixture of alkyls tin compound and alkyls lead compound as catalyst, excellent catalytic effect.
Further, the alkyls tin compound includes dibutyl tin dilaurate, tributyl tin, the alkyls leaded
Closing object includes lead tetraethide, isooctyl acid lead.Inventor has found through test of many times, can be accelerated outside using above-mentioned substance as catalyst
The solidification rate of resin layer simultaneously promotes its intensity.
Further, sphericity >=0.7 of the haydite, circularity >=0.7, resistant to breakage rate≤8%, acid solubility≤5%.With
It is higher to state the proppant percentage of damage that haydite is prepared as aggregate, and apparent density is small.
Detailed description of the invention
Fig. 1 is the electron-microscope scanning figure of the overlay film proppant prepared in embodiment 1.
Specific embodiment
Raw material selection is illustrated below, and the present invention is described in further detail by specific embodiment:
Phenolic resin curing agent in the present embodiment is hexamethylenetetramine.
Amines additives in the present embodiment are diethylenetriamine, in triethylamine, ethamine, ethylenediamine, triethylene tetramine
It is one or several kinds of.
Catalyst is the one or several kinds of dibutyl tin dilaurate, isooctyl acid lead in the present embodiment.
A kind of preparation method of overlay film proppant, includes the following steps:
(1) prepare following material: 40/70 mesh haydite, polyalcohols resin, phenolic resin, phenolic resin curing agent, isocyanide
Acid ester resin, catalyst and amines additives, wherein the hydroxyl equivalent of polyalcohols resin is 60-300, isocyanate resin matter
Measure the 2/5-4/5 for the amount that number is polyalcohols resin；
(2) it heats: the haydite in step (1) is heated to 180-230 DEG C；
(3) mulling: the haydite in step (2) is added in mulling pot with the revolving speed mulling of 70-100 turns/min；
(4) first time overlay film: the phenolic resin in step (1) is added in mulling pot；It is down to mulling pot temperature
The phenolic resin curing agent in step (1) is added at 150-200 DEG C；
(5) second of overlay film: polyalcohols resin and catalyst are added when the temperature of mulling pot is down to 80-130 DEG C；
Amines additives are added at 70-110 DEG C；Isocyanate resin is added at 60-100 DEG C；
(6) it shakes out: shaking out at 40-70 DEG C.
It using the above method, is made respectively of the material of different ratio from suspended prop, obtains embodiment 1-6, it is different
The specific mass fraction of each material is as shown in table 1 in embodiment:
Table 1
Comparative example 1
A kind of preparation method of overlay film proppant, includes the following steps:
(1) prepare following material: 40,/70 80 parts of mesh haydite, 0.25 part of phenolic resin, 0.15 part of phenolic resin curing agent,
0.25 part and 0.15 part of outermost resin curing agent of outermost resin, wherein outermost resin is phenolic resin or epoxy resin；
(2) it heats: the haydite in step (1) is heated to 180-230 DEG C；
(3) mulling: the haydite in step (2) is added in mulling pot with the revolving speed mulling of 70-100 turns/min；
(4) first time overlay film: the phenolic resin in step (1) is added in mulling pot；It is down to mulling pot temperature
The phenolic resin curing agent in step (1) is added at 150-200 DEG C；
(5) second of overlay film: outermost resin is added when the temperature of mulling pot is down to 80-130 DEG C；Temperature to mulling pot
Outermost resin curing agent is added when being down to 60-100 DEG C；
(6) it shakes out: shaking out at 40-70 DEG C.
Comparative example 2
A kind of preparation method of overlay film proppant, includes the following steps:
(1) prepare following material: 40,/70 80 parts of mesh haydite, 0.15 part of polyalcohols resin, 0.25 part of phenolic resin, phenol
0.15 part of urea formaldehyde curing agent, 0.09 part of isocyanate resin and 0.005 part of catalyst；
(2) it heats: the haydite in step (1) is heated to 180-230 DEG C；
(3) mulling: the haydite in step (2) is added in mulling pot with the revolving speed mulling of 70-100 turns/min；
(4) first time overlay film: the phenolic resin in step (1) is added in mulling pot；It is down to mulling pot temperature
The curing agent in step (1) is added at 150-200 DEG C；
(5) second of overlay film: polyalcohols resin and catalyst are added when the temperature of mulling pot is down to 80-130 DEG C；
Isocyanate resin is added at 60-100 DEG C；
(6) it shakes out: shaking out at 40-70 DEG C.
Comparative example 3
A kind of preparation method of overlay film proppant, includes the following steps:
(1) prepare following material: 40,/70 80 parts of mesh haydite, 0.15 part of polyalcohols resin, 0.25 part of phenolic resin, phenol
0.15 part of urea formaldehyde curing agent, 0.045 part of isocyanate resin, 0.005 part of catalyst and 0.05 part of amines additives；It is wherein more
The hydroxyl equivalent of first alcohol resinoid is 60-300；
(2) it heats: the haydite in step (1) is heated to 180-230 DEG C；
(3) mulling: the haydite in step (2) is added in mulling pot with the revolving speed mulling of 70-100 turns/min；
(4) first time overlay film: the phenolic resin in step (1) is added in mulling pot；It is down to mulling pot temperature
The curing agent in step (1) is added at 150-200 DEG C；
(5) second of overlay film: polyalcohols resin and catalyst are added when the temperature of mulling pot is down to 80-130 DEG C；
Amines additives are added at 70-110 DEG C；Isocyanate resin is added at 60-100 DEG C；
(6) it shakes out: shaking out at 40-70 DEG C.
Comparative example 4
A kind of preparation method of overlay film proppant, includes the following steps:
(1) prepare following material: 40,/70 80 parts of mesh haydite, 0.15 part of polyalcohols resin, 0.25 part of phenolic resin, phenol
0.15 part of urea formaldehyde curing agent, 0.13 part of isocyanate resin, 0.005 part of catalyst and 0.05 part of amines additives；It is wherein more
The hydroxyl equivalent of first alcohol resinoid is 60-300；
(2) it heats: the haydite in step (1) is heated to 180-230 DEG C；
(3) mulling: the haydite in step (2) is added in mulling pot with the revolving speed mulling of 70-100 turns/min；
(4) first time overlay film: the phenolic resin in step (1) is added in mulling pot；It is down to mulling pot temperature
The curing agent in step (1) is added at 150-200 DEG C；
(5) second of overlay film: polyalcohols resin and catalyst are added when the temperature of mulling pot is down to 80-130 DEG C；
Amines additives are added at 70-110 DEG C；Isocyanate resin is added at 60-100 DEG C；
(6) it shakes out: shaking out at 40-70 DEG C.
The performance of proppant made from above-described embodiment and comparative example is tested respectively, the performance of the proppant measured
Index is as follows:
1. suspension time
Suspension time refers to that the maximum duration that can freely suspend in water, experimental data are as shown in table 2:
Table 2
Come as can be seen from Table 2, is all made of polyalcohols resin and isocyanates tree in embodiment 1-6 and comparative example 2
Rouge can be with compared with the proppant that comparative example 1 does not use polyalcohols resin and isocyanate resin to prepare the proppant for preparing
It obtains, the proppant prepared using polyalcohols resin and isocyanate resin can be in clear water from suspension；Embodiment 1-6
Compared with comparative example 2 it can be concluded that, the proppant suspension time prepared after amines additives is added during the preparation process and is both greater than 4
Hour, can fully meet deep-well pressure break requirement, and be not added with amines additives preparation proppant then suspension time is shorter.It is real
A 1-6 and the comparison of comparative example 3 are applied as can be seen that when the amount of isocyanate resin is less, the proppant suspension time of preparation is remote
Much smaller than 4 hours, and when the amount of the isocyanates of addition is more, the proppant of preparation is also small well below 4 from suspension time
When.
2. suspension ratio
It suspends than being to evaluate proppant suspension amount in upper layer accounts for the percentage of total proppant in water, our uses in test
Sand: the case where water is 4:1 is evaluated.Experimental method is to measure 200ml water in the wide-mouth bottle of 300ml with graduated cylinder and pour into extensively
In mouth bottle, precise 50g proppant is poured into the wide-mouth bottle for having filled water, is closed the lid, up and down firmly shake 30 times, and static 10
After minute, firmly shakes 30 times up and down after the same method, the sand of the suspension on upper layer is filtered out after static with filter paper, after drying
The weight for weighing the sand filtered out is m, suspension amount X=m/50*100%.It is as shown in table 3:
Table 3
It can be seen that come from the data in table 3, when static, the riverfrac treatment that embodiment 1-6 is prepared is supported
Agent has a certain amount of proppant that left floating on upper layer；And in comparative example 1-2, due to proppant generate number of bubbles not
It meets the requirements, when static, proppant that upper layer not left floating.
3. other conventional indexs:
Other conventional indexs are as shown in table 4:
Table 4
" certainly outstanding composite index " is the overall target for evaluating proppant suspendability in clear water in upper table, by mattress height
Ratio codetermines with suspending, and engineering significance is practical bulk density of the proppant in clear water, and value is smaller to be equivalent in water
In relative density with regard to smaller, then the suspension of proppant is better, suspension time is longer.
(b is suspension ratio, h is mattress height)
From table 2 to table 4, it can be seen that, the overlay film proppant in this programme can reach even better than existing pressure break support
The indices of agent, and riverfrac treatment is realized, using clear water as fracturing fluid, reduce the configuration process of fracturing fluid complexity, essence
Letter equipment, reduces manpower waste, it is most important that also reduces the pollution to environment.
By embodiment 1 and the comparison of comparative example 1 and comparative example 2 it is found that not using polyalcohols resin and isocyanide in outer layer
When acid ester resin or outer layer use polyalcohols resin or isocyanate resin but are not added with amines additives, the support of preparation
Agent cannot be from suspension or suspension time well below 4 hours in clear water, cannot in the case where not adding other carrying liquid
Meet pressure break demand.
By embodiment 1 and the comparison of comparative example 3 and comparative example 4 it is found that the amount of isocyanate resin is very few cannot to generate needs
The bubble of quantity cannot generate bubble, and isocyanate resin dosage is excessive, and the volume of bubble can be made excessive, causes
Bubble is easy to rupture, and finally proppant suspendability can be made weak, cannot suspended in clear water.
What has been described above is only an embodiment of the present invention, and the common sense such as well known specific structure and characteristic are not made herein in scheme
Excessive description.It, without departing from the structure of the invention, can be with it should be pointed out that for those skilled in the art
Several modifications and improvements are made, these also should be considered as protection scope of the present invention, these all will not influence what the present invention was implemented
Effect and patent practicability.The scope of protection required by this application should be based on the content of the claims, in specification
The records such as specific embodiment can be used for explaining the content of claim.
Claims (8)
1. a kind of preparation method of overlay film proppant, which comprises the steps of:
(1) prepare following raw material: aggregate, polyalcohols resin, phenolic resin, phenolic resin curing agent, isocyanate resin,
Catalyst and amines additives, wherein the hydroxyl equivalent of polyalcohols resin is 60-300, and isocyanate resin mass fraction is
The 2/5-4/5 of the amount of polyalcohols resin；
(2) it heats: the aggregate in step (1) is heated to 180-230 DEG C；
(3) mulling: the aggregate in step (2) is added in mulling pot with the revolving speed mulling of 70-100 turns/min；
(4) first time overlay film: the phenolic resin in step (1) is added in mulling pot；150-200 is down to mulling pot temperature
DEG C when be added step (1) in phenolic resin curing agent；
(5) second of overlay film: polyalcohols resin and catalyst are added when the temperature of mulling pot is down to 80-130 DEG C；70-110
DEG C when amines additives are added；Isocyanate resin is added at 60-100 DEG C；
(6) it shakes out: shaking out at 40-70 DEG C.
2. a kind of preparation method of overlay film proppant according to claim 1, it is characterised in that: each former material in step (1)
The mass fraction of material is as follows: 80-120 parts of aggregate, 0.25-5 parts of phenolic resin；The mass fraction of polyalcohols resin is 0.15-
3.2 part；The amount of phenolic resin curing agent accounts for the 1/10-1/2 of the amount of phenolic resin, and wherein polyurethane resin is by polyalcohols resin
It is synthesized with isocyanate resin, the amount of catalyst is the 1/1000-1/100 of polyurethane resin, and the amount of amines additives is poly- ammonia
The 1/100-1/5 of ester resin.
3. a kind of preparation method of overlay film proppant according to claim 2, it is characterised in that: the aggregate is haydite.
4. a kind of preparation method of overlay film proppant according to claim 3, which is characterized in that the phenolic resin curing
Agent is hexamethylenetetramine.
5. a kind of preparation method of overlay film proppant according to claim 1 or 4, it is characterised in that: the amine addition
Agent is one of diethylenetriamine, triethylamine, ethamine, ethylenediamine, triethylene tetramine or several.
6. a kind of preparation method of overlay film proppant according to claim 4, it is characterised in that: the catalyst is alkyl
The mixture of class tin compound and alkyls lead compound.
7. a kind of preparation method of overlay film proppant according to claim 6, it is characterised in that: the alkyls tin chemical combination
Object includes dibutyl tin dilaurate, tributyl tin, and the alkyls lead compound includes lead tetraethide, isooctyl acid lead.
8. a kind of preparation method of overlay film proppant according to claim 7, it is characterised in that: the sphericity of the haydite >=
0.7, circularity >=0.7, resistant to breakage rate≤8%, acid solubility≤5%.
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| KR20200134496A (en) * | 2019-05-22 | 2020-12-02 | 더야오 탕 | A double-coated proppant |
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| KR102651926B1 (en) | 2019-05-22 | 2024-03-28 | 더야오 탕 | A double-coated proppant |
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