CN111154479A - Shale debris coated proppant and preparation method and application thereof - Google Patents
Shale debris coated proppant and preparation method and application thereof Download PDFInfo
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- CN111154479A CN111154479A CN202010076354.XA CN202010076354A CN111154479A CN 111154479 A CN111154479 A CN 111154479A CN 202010076354 A CN202010076354 A CN 202010076354A CN 111154479 A CN111154479 A CN 111154479A
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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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
Abstract
The invention discloses a shale chip coated proppant and a preparation method and application thereof. The shale chip coated proppant comprises aggregate and a coating layer coated on the surface of the aggregate; the material of the coating layer comprises a composite material and pyrolysis-treated shale debris doped in the composite material. The invention also provides a preparation method and application of the shale chip coated proppant. The outer coating layer of the shale fragment coated proppant provided by the invention contains the shale fragments subjected to pyrolysis treatment, has mechanical strength similar to that of a mining stratum, can effectively prevent the proppant from being embedded into the shale, has strength enough to support new cracks, is beneficial to discharge of oil gas, and has low flowback rate during flowback.
Description
Technical Field
The invention relates to the technical field of petrochemical industry. More particularly, relates to a shale debris coated proppant and a preparation method and application thereof.
Background
With the exploitation of a large amount of energy sources such as petroleum and natural gas, people gradually turn their eyes to the development and utilization of unconventional energy sources such as shale gas. Although the reserves of unconventional energy sources in China are huge, the unconventional energy sources are not fully utilized due to the limitation of the mining process.
The shale gas reservoir has the characteristics of low porosity and low permeability, so that the reservoir is required to be transformed by a hydraulic fracturing technology, so that migration channels of shale gas such as shale pores, fracture networks and the like are changed, and further the shale gas recovery rate is improved. The hydraulic fracturing needs to use fracturing fluid to carry a large amount of propping agent to be pumped into the underground through high pressure and high speed to fill all parts of the crack, and the crack is prevented from being closed through propping the crack, so that the shale gas passes through the gaps of the propping agent, a transportation channel is opened, the shale gas yield is increased, the service life of a gas well is prolonged, and the purpose of improving the recovery ratio is achieved.
After shale gas is mined, a part of waste water can be recycled, but the waste water carries a large amount of shale debris, so that environmental pollution and resource waste are caused. Influenced by a complex geological background and a multi-stage evolution process, the Chinese geological structure has the characteristics of multi-block, multi-convolution and multi-level complex structure movement, so that the sedimentary basin of China has multiple types and complex structure. Shale debris is currently divided into three major categories: firstly, drilling by using clear water as drilling fluid in superficial earth surface (hundreds of meters) debris, wherein the shale debris does not contain pollutants; secondly, drilling by adopting water-based drilling fluid to about 1800 m, and returning to the ground to obtain water-based drilling cuttings, wherein the components of the water-based drilling cuttings comprise bentonite, a lubricant, potassium chloride, soda, polyalcohol and the like; thirdly, the diesel oil-based drilling fluid is adopted to drill to about 4500 m and returns to the ground, namely the oil-based drilling rock debris, and the components contain harmful substances such as diesel oil, organic matters and the like, so that the environment is greatly damaged.
Therefore, it is desirable to provide a shale chip coated proppant, a preparation method and an application thereof, so as to solve at least one of the problems.
Disclosure of Invention
The first purpose of the invention is to provide a shale debris coated proppant.
The second purpose of the invention is to provide a preparation method of the shale debris coated proppant.
The third purpose of the invention is to provide the application of the shale debris coated proppant.
In order to achieve the purpose, the invention adopts the following technical scheme:
a shale chip coated proppant comprises aggregate and a coating layer coated on the surface of the aggregate; the material of the coating layer comprises a composite material and pyrolysis-treated shale debris doped in the composite material.
In the invention, in order to eliminate the environmental pollution of shale fragments and avoid resource waste, the pyrolysis method is adopted to treat the shale fragments, and the shale fragments after the pyrolysis treatment are coated on the aggregate, so that the prepared coated proppant has the characteristics of high strength, low density, corrosion resistance, high flow conductivity and the like compared with the traditional proppant, can ensure that the coated proppant has physical properties close to those of a rock stratum, can effectively prevent the proppant from being embedded into the rock stratum, can protect the rock stratum, can also play a better supporting role, can also effectively utilize and recover the shale fragments in waste water, and avoids environmental pollution and resource waste.
Preferably, the aggregate is added in an amount of 70 wt% to 99.99 wt% of the total amount of the shale chip coated proppant by mass percentage.
Preferably, the composite material is added in an amount of 0.01 wt% to 15 wt% of the total amount of the shale debris coated proppant by mass percentage.
Preferably, the addition amount of the pyrolysis-treated shale debris accounts for 1 wt% to 15 wt% of the total amount of the shale debris coated proppant by mass percentage.
Preferably, the aggregate includes one or more of mica, ceramsite sand, quartz sand, nut shells, coal gangue, diatomaceous earth, glass balls, crushed charcoal, fly ash, slag, sawdust, wood chips, and resin particles.
Preferably, the aggregate has a particle size ranging from 10 mesh to 100 mesh.
Preferably, the composite material is a high polymer material which is soluble in an organic solvent at normal temperature and is insoluble in water.
Preferably, the composite material comprises polymethylmethacrylate and/or a thermoplastic resin.
Preferably, the thermoplastic resin comprises a phenolic resin and/or an epoxy resin.
Preferably, the preparation of the pyrolytically treated shale fraction comprises the steps of:
drying the shale fragments, heating the dried shale fragments to 400-550 ℃ at a heating rate of 6-10 ℃/min in an inert gas or nitrogen atmosphere, and pyrolyzing for 2-4 hours to obtain the pyrolyzed shale fragments.
Preferably, the drying conditions in the process of drying the shale debris are as follows: drying for 6-8 h at 105-150 ℃.
Preferably, after the pyrolysis is completed, the method further comprises the step of maintaining the pyrolyzed product for 2-4 hours at normal temperature.
Preferably, the bulk density of the shale debris coated proppant is less than 1.7g/cm3。
Preferably, the shale chip coated proppant has a fracture rate of less than 10% in a crush resistance test at 69 Mpa.
The coating layer can enhance the connection with the aggregate, so that the coating layer and the aggregate are combined more tightly and completely. Because the outer coating layer of the coated proppant provided by the invention contains shale fragments, the coated proppant has mechanical strength similar to that of a mining stratum, can effectively prevent the coated proppant from being embedded into the shale to protect the stratum, has enough strength to support new cracks, is beneficial to the discharge of oil gas, and has low flowback rate during flowback; meanwhile, the coated proppant can effectively utilize shale fragments in wastewater, thereby not only protecting the environment, but also being beneficial to the reasonable utilization of resources.
As another aspect of the present invention, the present invention further provides a preparation method of the shale debris coated proppant, which comprises the following steps:
uniformly mixing the composite material and an organic solvent to obtain a mixed solution A;
uniformly mixing the shale debris subjected to pyrolysis treatment with the mixed solution A to obtain a mixed solution B;
uniformly mixing the aggregate and the mixed solution B to obtain a solid-liquid mixture;
filtering the solid-liquid mixture into water through a screen, and collecting a solid isolate in the water;
and drying the solid isolate to obtain the shale debris coated proppant.
In the invention, a solid-liquid mixture containing aggregate, the pyrolyzed shale chips and the composite material is screened into water in the film covering process, the water is used as an anti-solvent, so that an organic solvent and the like can be quickly dissolved in the water, and only the coating layer containing the composite material and the pyrolyzed shale chips is coated on the surface of the aggregate, thereby leading the coating layer and the aggregate to be more tightly combined.
Preferably, the using ratio of the composite material to the organic solvent is 10 g-50 g:500 ml.
Preferably, the organic solvent is acetone or ethanol.
Preferably, the amount ratio of the pyrolyzed shale debris to the mixed solution A is 10 g-30 g:500 ml.
Preferably, the method further comprises a step of grinding the pyrolyzed shale debris before uniformly mixing the pyrolyzed shale debris and the mixed solution a, wherein the mesh number of the ground pyrolyzed shale debris is 5-10 meshes.
Preferably, the process of uniformly mixing the pyrolyzed shale debris and the mixed solution a specifically includes: mixing the shale debris subjected to pyrolysis treatment with the mixed solution A, and stirring at 800-1000 rpm for 10-15 min.
Preferably, the process of uniformly mixing the aggregate and the mixed solution B specifically includes: mixing the aggregate and the mixed solution B, and stirring at 600-800 rpm for 3-5 min.
Preferably, the aperture of the screen is 20-40 meshes.
Preferably, the process of washing and drying the solid isolate specifically comprises: washing the solid separated matter in water, stoving at 60-80 deg.c for 1-2 hr, stirring and further stoving at 60-80 deg.c for 1-2 hr.
As another aspect of the invention, the invention also provides application of the shale debris coated proppant in hydraulic fracturing of a shale gas reservoir, conventional fractured rock fracture propping and diversion, or shale debris dangerous waste treatment.
In addition, unless otherwise specified, any range recited herein includes any value between the endpoints and any sub-range defined by any value between the endpoints or any value between the endpoints.
The invention has the following beneficial effects:
(1) the outer coating layer of the shale fragment coated proppant provided by the invention contains the shale fragments subjected to pyrolysis treatment, has mechanical strength similar to that of a mining stratum, can effectively prevent the proppant from being embedded into the shale, has strength enough to support new cracks, is beneficial to discharge of oil gas, and has low flowback rate during flowback;
(2) the shale debris coated proppant provided by the invention can effectively utilize shale debris in wastewater, can reasonably treat hazardous waste, and is environment-friendly and beneficial to reasonable utilization of resources.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 shows a physical representation of the shale chips that were not pyrolyzed in example 1 of the present invention.
FIG. 2 shows a physical representation of pyrolytically treated shale debris in example 1 of the present invention.
FIG. 3 shows a top view of the shale chip coated proppant made according to comparative example 1 of the present invention settling in a 0.625 wt% guar gum solution for 100 minutes.
FIG. 4 is a side view showing the settling of the shale chip coated proppant made according to comparative example 1 of the present invention in a 0.625 wt% guar gum solution for 100 minutes.
Fig. 5 shows a top view of the shale chip coated proppant made in example 3 of the present invention settling in a 0.625 wt% guar gum solution for 100 minutes.
Fig. 6 shows a side view of shale chip coated proppant made in example 3 of the present invention settling in a 0.625 wt% guar gum solution for 100 minutes.
FIG. 7 is a schematic structural diagram of a shale chip coated proppant prepared in example 3 of the present invention; wherein, 1-aggregate, 2-coating layer and 3-shale debris after pyrolysis treatment.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below in connection with preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
In the invention, the preparation method is a conventional method if no special description exists, and the temperature condition is a normal temperature condition if no special description exists; the starting materials used are commercially available from published sources unless otherwise specified.
Example 1
The embodiment provides a preparation method of pyrolysis-treated shale debris, which comprises the following steps:
weighing a proper amount of shale chip sample, putting the shale chip sample into an air box, drying the shale chip sample for 6 hours at 105 ℃, and taking out the shale chip sample; placing the dried shale fragments in a quartz container, placing the quartz reaction container in a tubular pyrolysis furnace, filling nitrogen at a rate of 100mL/min, after 30min, heating to 550 ℃ at a heating rate of 10 ℃/min under the nitrogen atmosphere, and keeping for 2 hours for pyrolysis; and curing the pyrolyzed product at normal temperature for 2 hours to obtain the shale debris subjected to pyrolysis treatment.
In this example, a physical diagram of the shale debris that has not been pyrolyzed is shown in fig. 1, and a physical diagram of the shale debris that has been pyrolyzed is shown in fig. 2.
Example 2
The embodiment provides a preparation method of a shale debris coated proppant, which comprises the following steps:
step one, preparing the following materials: 300 parts of quartz sand, 5 parts of phenolic resin, 40 parts of ethanol and 100 parts of pyrolysis-treated shale debris prepared in example 1;
step two, mixing phenolic resin and ethanol solution according to the proportion of 50g to 500ml to obtain mixed solution A;
the pyrolysis-treated shale chips ground into 5 meshes were mixed with the mixed solution a in a ratio of 30 g:500ml, mechanically stirring at 1000rpm for 15min at normal temperature, and sealing the beaker in the stirring process to reduce ethanol volatilization to obtain a mixed solution B;
stirring and pouring quartz sand into the mixed solution B, and mechanically stirring at 800rpm for 1min at normal temperature so as to uniformly distribute the quartz sand in the mixed solution B to obtain a solid-liquid mixture;
step three, uniformly filtering the solid-liquid mixture into water through a 40-mesh screen, and collecting solid separators in the water; in this step, in order to complete the material screening process, it is necessary to satisfy the condition that there is relative movement between the material and the screening surface. Thus acting on the screen with a suitable transverse movement; through the movement of the screen, only a part of precoated sand with different granularity and mixed thickness enters the screen surface, and due to the vibration of the screen, the material layer on the screen is loosened, so that the gap existing originally in large particles is further enlarged, and small particles pass through the gap by a machine, are transferred to the lower layer and enter water through the screen;
and step four, putting the solid isolate into an oven, drying for 1 hour at 60 ℃, taking out, and stirring by using a spoon, so that the solid isolate which is not dried completely at the lower layer part can be heated and dried better, and the uppermost layer part is prevented from being agglomerated into blocks. And then continuously drying for 1 hour at the temperature of 60 ℃ to obtain the shale chip coated proppant.
Example 3
The embodiment provides a preparation method of a shale debris coated proppant, which comprises the following steps:
step one, preparing the following materials: 300 parts of quartz sand, 5 parts of phenolic resin, 40 parts of acetone and 100 parts of pyrolysis-treated shale debris prepared in example 1;
step two, mixing phenolic resin and acetone solution according to the proportion of 50g to 500ml to obtain mixed solution A;
the pyrolysis-treated shale chips ground into 5 meshes were mixed with the mixed solution a in a ratio of 30 g:500ml, mechanically stirring at 1000rpm for 15min at normal temperature, and sealing the beaker in the stirring process to reduce acetone volatilization to obtain a mixed solution B;
stirring and pouring quartz sand into the mixed solution B, and mechanically stirring at 800rpm for 1min at normal temperature so as to uniformly distribute the quartz sand in the mixed solution B to obtain a solid-liquid mixture;
step three, uniformly filtering the solid-liquid mixture into water through a 40-mesh screen, and collecting solid separators in the water; in this step, in order to complete the material screening process, it is necessary to satisfy the condition that there is relative movement between the material and the screening surface. Thus acting on the screen with a suitable transverse movement; through the movement of the screen, only a part of precoated sand with different granularity and mixed thickness enters the screen surface, and due to the vibration of the screen, the material layer on the screen is loosened, so that the gap existing originally in large particles is further enlarged, and small particles pass through the gap by a machine, are transferred to the lower layer and enter water through the screen;
and step four, putting the solid isolate into an oven, drying for 1 hour at 60 ℃, taking out, and stirring by using a spoon, so that the solid isolate which is not dried completely at the lower layer part can be heated and dried better, and the uppermost layer part is prevented from being agglomerated into blocks. Then, continuously drying for 1 hour at 60 ℃ to obtain the shale chip coated proppant, wherein the structural schematic diagram of the shale chip coated proppant is shown in fig. 7 and comprises aggregate 1 and a coating layer 2 coated on the surface of the aggregate; the coating layer 2 is doped with pyrolytically treated shale debris 3.
The shale chip coated proppant prepared in this example was added to a 0.625 wt% guar gum solution and left for 100 minutes, and the result of sedimentation is shown in fig. 5 and 6, where more proppant was suspended on the upper surface of the guar gum solution and more than 80% proppant was suspended on the bottom of the guar gum solution, although there was also sedimentation.
Example 4
The embodiment provides a preparation method of a shale debris coated proppant, which comprises the following steps:
step one, preparing the following materials: 300 parts of quartz sand, 5 parts of polymethyl methacrylate, 40 parts of acetone and 100 parts of pyrolysis-treated shale debris prepared in example 1;
step two, mixing polymethyl methacrylate and acetone solution according to the proportion of 50g to 500ml to obtain mixed solution A;
the pyrolysis-treated shale chips ground into 5 meshes were mixed with the mixed solution a in a ratio of 30 g:500ml, mechanically stirring at 1000rpm for 15min at normal temperature, and sealing the beaker in the stirring process to reduce acetone volatilization to obtain a mixed solution B;
stirring and pouring quartz sand into the mixed solution B, and mechanically stirring at 800rpm for 1min at normal temperature so as to uniformly distribute the quartz sand in the mixed solution B to obtain a solid-liquid mixture;
step three, uniformly filtering the solid-liquid mixture into water through a 40-mesh screen, and collecting solid separators in the water; in this step, in order to complete the material screening process, it is necessary to satisfy the condition that there is relative movement between the material and the screening surface. Thus acting on the screen with a suitable transverse movement; through the movement of the screen, only a part of precoated sand with different granularity and mixed thickness enters the screen surface, and due to the vibration of the screen, the material layer on the screen is loosened, so that the gap existing originally in large particles is further enlarged, and small particles pass through the gap by a machine, are transferred to the lower layer and enter water through the screen;
and step four, putting the solid isolate into an oven, drying for 1 hour at 60 ℃, taking out, and stirring by using a spoon, so that the solid isolate which is not dried completely at the lower layer part can be heated and dried better, and the uppermost layer part is prevented from being agglomerated into blocks. And then continuously drying for 1 hour at the temperature of 60 ℃ to obtain the shale chip coated proppant.
Comparative example 1
The comparative example provides a preparation method of a shale chip coated proppant, which comprises the following steps:
step one, preparing the following materials: 300 parts of quartz sand, 5 parts of phenolic resin and 100 parts of pyrolysis-treated shale debris prepared in example 1;
step two, heating the aggregate obtained in the step one to about 150 ℃, and pouring the aggregate into a marmite for sand mixing;
step three, heating the phenolic resin to 110 ℃, and mixing the phenolic resin with the shale chips subjected to pyrolysis treatment to obtain a mixture;
step four, adding the mixture obtained in the step three when the temperature of the mixing pan is reduced to 80-150 ℃;
fifthly, discharging sand when the temperature of the mixing pan is reduced to 40 ℃, uniformly filtering the sand into water through a 40-mesh screen, and collecting solid separators in the water; standing the solid isolate for 5min at normal temperature, coating the pyrolyzed shale debris on the surface of the coated sand, then putting the coated proppant into an air-blast drying oven for drying for 1 hour at 60 ℃, taking out the coated proppant, and stirring the coated proppant by using a spoon to ensure that the solid isolate which is not dried completely at the lower part can be better heated and dried, thereby avoiding the agglomeration of the uppermost part into blocks. And then continuously drying for 1 hour at the temperature of 60 ℃ to obtain the shale chip coated proppant.
The shale chip coated proppant prepared in the comparative example was added to a 0.625 wt% guar gum solution and left for 100 minutes, and the result of sedimentation is shown in fig. 3 and 4, where little proppant was suspended on the surface of the guar gum solution and more than 95% of proppant was deposited on the bottom.
Comparative example 2
The comparative example provides a method for preparing a coated proppant, comprising the steps of:
step one, preparing the following materials: 300 parts of quartz sand, 5 parts of phenolic resin and 40 parts of ethanol;
step two, mixing the phenolic resin with the ethanol solution according to the proportion of 50g to 500ml, mechanically stirring at 1000rpm for 15min at normal temperature, and sealing a beaker in the stirring process to reduce ethanol volatilization to obtain a mixed solution;
stirring quartz sand while pouring into the mixed solution, and mechanically stirring at 800rpm for 1min at normal temperature to uniformly distribute the quartz sand in the mixed solution to obtain a solid-liquid mixture;
step three, uniformly filtering the solid-liquid mixture into water through a 40-mesh screen, and collecting solid separators in the water; in this step, in order to complete the material screening process, it is necessary to satisfy the condition that there is relative movement between the material and the screening surface. Thus acting on the screen with a suitable transverse movement; through the movement of the screen, only a part of precoated sand with different granularity and mixed thickness enters the screen surface, and due to the vibration of the screen, the material layer on the screen is loosened, so that the gap existing originally in large particles is further enlarged, and small particles pass through the gap by a machine, are transferred to the lower layer and enter water through the screen;
and step four, putting the solid isolate into an oven, drying for 1 hour at 60 ℃, taking out, and stirring by using a spoon, so that the solid isolate which is not dried completely at the lower layer part can be heated and dried better, and the uppermost layer part is prevented from being agglomerated into blocks. And then continuously drying for 1 hour at the temperature of 60 ℃ to obtain the coated proppant.
Test example 1
In the test example, the roundness, sphericity, bulk density, apparent density, turbidity and breakage rate of the uncoated quartz sand and the coated proppants prepared in the above examples and comparative examples are respectively tested according to the performance test recommendation method of the standard SY/T5108-2006 fracturing propping agent, and the performance indexes of the coated proppants are measured and shown in the following table 1:
table 1 results of performance testing
The suspension time in table 1 is the maximum time the proppant can freely suspend in the guar solution.
As can be seen from table 1, the shale debris proppant added with the pyrolyzed shale debris and the composite material during the coating process has a sphericity close to 1, and the bulk density and the apparent density are lower than those of the proppant coated with the common resin. The fracturing experiment results show that the strength of the proppant is improved by adding the composite material and the shale debris, the fracture rate is lower than that of a film coating method for adding the shale debris, and the addition of the shale debris can improve the strength of the proppant and provide lower fracture rate, so that the proppant can be effectively prevented from being embedded into a stratum and plays a role in propping.
Compared with the uncoated quartz sand, the coated proppant in the comparative example and the embodiment has obvious performance improvement, and the embodiment is obviously superior to the comparative example in the sedimentation time index, so that the shale debris coated proppant has stronger suspension capacity and stronger applicability than the conventional proppant and the conventional coated proppant under the same condition.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (10)
1. The shale debris coated proppant is characterized by comprising aggregate and a coating layer coated on the surface of the aggregate; the material of the coating layer comprises a composite material and pyrolysis-treated shale debris doped in the composite material.
2. The shale debris coated proppant as set forth in claim 1, wherein the aggregate is added in an amount of 70 wt% to 99.99 wt% of the total amount of the shale debris coated proppant, the composite is added in an amount of 0.01 wt% to 15 wt% of the total amount of the shale debris coated proppant, and the pyrolyzed shale debris is added in an amount of 1 wt% to 15 wt% of the total amount of the shale debris coated proppant.
3. The shale chip coated proppant of claim 1, wherein the aggregate comprises one or more of mica, ceramsite sand, quartz sand, nut shells, coal gangue, diatomaceous earth, glass balls, crushed charcoal, fly ash, smelter slag, sawdust, wood chips, and resin particles;
preferably, the aggregate has a particle size ranging from 10 mesh to 100 mesh.
4. The shale debris coated proppant according to claim 1, wherein the composite material is a polymer material which is soluble in an organic solvent at normal temperature and insoluble in water;
preferably, the composite material comprises polymethylmethacrylate and/or a thermoplastic resin;
preferably, the thermoplastic resin comprises a phenolic resin and/or an epoxy resin.
5. The shale-crumb coated proppant of claim 1, wherein the preparation of the pyrolytically treated shale crumb comprises the steps of:
drying the shale fragments, heating the dried shale fragments to 400-550 ℃ at a heating rate of 6-10 ℃/min in an inert gas or nitrogen atmosphere, and pyrolyzing for 2-4 hours to obtain the pyrolyzed shale fragments;
preferably, the drying conditions in the process of drying the shale debris are as follows: drying for 6-8 h at 105-150 ℃;
preferably, after the pyrolysis is completed, the method further comprises the step of maintaining the pyrolyzed product for 2-4 hours at normal temperature.
6. The preparation method of the shale debris coated proppant as set forth in any one of claims 1 to 5, characterized by comprising the following steps:
uniformly mixing the composite material and an organic solvent to obtain a mixed solution A;
uniformly mixing the shale debris subjected to pyrolysis treatment with the mixed solution A to obtain a mixed solution B;
uniformly mixing the aggregate and the mixed solution B to obtain a solid-liquid mixture;
filtering the solid-liquid mixture into water through a screen, and collecting a solid isolate in the water;
and drying the solid isolate to obtain the shale debris coated proppant.
7. The preparation method of the shale debris coated proppant as claimed in claim 6, wherein the dosage ratio of the composite material to the organic solvent is 10 g-50 g:500 ml;
preferably, the organic solvent is acetone or ethanol.
8. The preparation method of the shale debris coated proppant as claimed in claim 6, wherein the dosage ratio of the pyrolyzed shale debris to the mixed solution A is 10-30 g:500 ml;
preferably, the process of uniformly mixing the pyrolyzed shale debris and the mixed solution a specifically includes: mixing the shale debris subjected to pyrolysis treatment with the mixed solution A, and stirring at 800-1000 rpm for 10-15 min.
9. The preparation method of the shale debris coated proppant as set forth in claim 6, wherein the process of uniformly mixing the aggregate and the mixed solution B specifically comprises: mixing the aggregate and the mixed solution B, and stirring at 600-800 rpm for 3-5 min;
preferably, the aperture of the screen is 20-40 meshes;
preferably, the process of washing and drying the solid isolate specifically comprises: washing the solid separated matter in water, stoving at 60-80 deg.c for 1-2 hr, stirring and further stoving at 60-80 deg.c for 1-2 hr.
10. The application of the shale debris coated proppant as set forth in any one of claims 1-5 in hydraulic fracturing of shale gas reservoirs, conventional fractured rock fracture propping and diversion, or shale debris dangerous waste treatment.
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| CN111808599A (en) * | 2020-07-10 | 2020-10-23 | 重庆地质矿产研究院 | Shale debris coated proppant with targeting function and preparation method and application thereof |
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