CN106867500B - Tectorial membrane proppant and preparation method thereof - Google Patents
Tectorial membrane proppant and preparation method thereof Download PDFInfo
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- CN106867500B CN106867500B CN201611267155.7A CN201611267155A CN106867500B CN 106867500 B CN106867500 B CN 106867500B CN 201611267155 A CN201611267155 A CN 201611267155A CN 106867500 B CN106867500 B CN 106867500B
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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 provides a film-coated proppant and a preparation method thereof. The coated proppant comprises: the shaped quartz sand particles and an organic coating, wherein the organic coating is coated on the surfaces of the quartz sand particles; the organic coating comprises a resin comprising: urea-formaldehyde resins, alkyd resins, phenolic resins, acrylic resins, epoxy resins or polyvinylpyrrolidone. The preparation method of the coated proppant comprises the following steps: step A: shaping the quartz sand particles to obtain shaped quartz sand particles for later use; and B: one or more resins are taken and mixed evenly; and C: heating the shaped quartz sand particles to 150-350 ℃, and pouring the heated quartz sand particles into a sand mixer; step D: and adding the uniformly mixed resin into the shaped quartz sand particles, and uniformly stirring to obtain a solid-liquid mixture formed by the shaped quartz sand particles and the resin. The film-coated propping agent disclosed by the invention is high in sphericity and strength.
Description
Technical Field
The invention relates to the field of oil extraction and mining, in particular to a tectorial membrane proppant and a preparation method thereof.
Background
The petroleum proppant is also called petroleum fracturing proppant. In the fracturing construction process, high-pressure solution with certain viscosity is pumped and injected into an underground reservoir, the pumping pressure exceeds the stratum fracture pressure, so that the underground reservoir is fractured to form a channel with high flow conductivity, and underground fluid such as oil and gas can enter a shaft through the fracture and is finally produced to the ground. In order to prevent the fracture formed after fracturing from being closed, a fracturing propping agent needs to be pumped into the fracture in the fracture opening process, and after construction is finished, the fracture can not be closed due to the fact that the interior of the fracture is filled with the petroleum propping agent, so that a higher flow guide channel is kept, oil and gas are smooth, and the yield is increased.
At present, the petroleum proppant is not limited to the two conventional types of quartz sand and ceramsite. Other types of proppants are emerging, such as walnut shells, glass spheres, and coated proppants. In the proppant, apart from the high sphericity and strength of the artificial ceramsite, the sphericity and strength of other natural proppants are relatively poor, and the strength is not high, so that the flow conductivity of the formed cracks is greatly reduced even if the proppant is filled into the cracks.
In summary, the following problems exist in the prior art: the prior natural proppant has poor sphericity and low strength.
Disclosure of Invention
The invention provides a film-coated proppant and a preparation method thereof, which are used for solving the problems of poor sphericity and low strength of the conventional proppant.
To this end, the present invention proposes a coated proppant comprising: the shaped quartz sand particles are prepared by a shaping method, the organic coating is coated on the surfaces of the quartz sand particles, and the organic coating is adhered to the surfaces of the quartz sand particles;
the organic coating comprises a resin containing one or more of the following macromolecules: urea-formaldehyde resins, alkyd resins, phenolic resins, acrylic resins, epoxy resins or polyvinylpyrrolidone;
the shaping method of the quartz sand particles comprises mechanical shaping and chemical shaping.
Further, the chemical agent used for chemical shaping is water glass, and the organic coating further comprises a curing agent which contains one or more of the following compounds: maleic anhydride, ethylenediamine, m-phenylenediamine, triethylene tetramine, polyisocyanate, phthalic anhydride or urotropin, wherein the content of the resin is 1-10 parts by weight and the content of the curing agent is 10-30 parts by weight relative to 100 parts by weight of shaped quartz sand particles.
The invention also provides a preparation method of the coated proppant, which comprises the following steps:
step A: shaping the quartz sand particles to obtain shaped quartz sand particles for later use;
and B: taking one or more resins, and uniformly mixing by using a mixer;
and C: heating the shaped quartz sand particles to 150-350 ℃, and pouring the heated quartz sand particles into a sand mixer;
step D: and when the temperature of the shaped quartz sand particles reaches 210-250 ℃, adding the uniformly mixed resin into the shaped quartz sand particles, and uniformly stirring to obtain a solid-liquid mixture formed by the shaped quartz sand particles and the resin.
Further, the air conditioner is provided with a fan,
the preparation method further comprises the step E: after step D, stirring the solid-liquid mixture until fully solidified;
alternatively, the preparation method further comprises step F: after step D, a curing agent is added to the solid-liquid mixture, and then stirred until fully cured.
Further, the preparation method specifically comprises the following steps:
step A1: adding 2kg of 16-20-mesh quartz sand particles into a shaping machine, grinding the quartz sand particles to be round until the sphericity of the shaped quartz sand particles is 0.8, and then screening the shaped quartz sand particles with 20-40 meshes for later use;
step B1: weighing 0.1kg of alkyd resin and 0.1kg of epoxy resin, and uniformly mixing by using a mixer;
step C1: weighing 1kg of the shaped quartz sand particles of 20-40 meshes, heating to 270 ℃, and pouring into a sand mixer;
step D1: when the temperature of the shaped quartz sand particles reaches 250 ℃, adding the uniformly mixed resin, and uniformly stirring to form a solid-liquid mixture;
step E1: and stirring the solid-liquid mixture until the solid-liquid mixture is fully solidified to prepare the film-coated propping agent.
Further, the preparation method specifically comprises the following steps:
step A20: 2kg of quartz sand particles of 30 to 50 meshes are added to be heated to 150 ℃, and then poured into a sand mixer;
step A21: under the condition of stirring, pouring 0.2kg of water glass into the quartz sand particles, uniformly stirring, shaping, waiting for complete solidification, and screening the shaped quartz sand particles of 20-40 meshes for later use;
step B2: weighing 0.1kg of alkyd resin and 0.1kg of epoxy resin, and uniformly mixing by using a mixer;
step C2: 1kg of the shaped quartz sand particles of 20 to 40 meshes is heated to 270 ℃ and poured into a sand mixer;
step D2: when the temperature of the shaped quartz sand particles reaches 250 ℃, adding the uniformly mixed resin, and uniformly stirring to form a solid-liquid mixture;
step E2: and stirring the solid-liquid mixture until the solid-liquid mixture is fully solidified to prepare the film-coated propping agent.
Further, the preparation method specifically comprises the following steps:
step A3: adding 2kg of quartz sand particles of 16-20 meshes into a shaping machine, grinding the quartz sand particles to be round until the sphericity is 0.8 to obtain shaped quartz sand particles, and then screening the shaped quartz sand particles of 20-40 meshes for later use;
step B3: weighing 0.1kg of phenolic resin and 0.1kg of epoxy resin, and uniformly mixing by using a mixer;
step C3: weighing 1kg of the shaped quartz sand particles of 20-40 meshes, heating to 270 ℃, and pouring into a sand mixer;
step D3: when the temperature of the shaped quartz sand particles reaches 250 ℃, adding the uniformly mixed resin, and uniformly stirring to form a solid-liquid mixture;
step F3: and adding 0.06kg of ethylenediamine into the solid-liquid mixture, and stirring until the mixture is fully solidified to obtain the film-coated propping agent.
Further, the preparation method specifically comprises the following steps:
step A40: adding 2kg of quartz sand particles of 30-50 meshes into the mixture, heating the mixture to 180 ℃, and pouring the mixture into a sand mixer;
step A41: under the condition of stirring, pouring 0.2kg of water glass into the quartz sand particles, uniformly stirring, shaping, waiting for complete solidification, and screening the shaped quartz sand particles of 20-40 meshes for later use;
step B4: weighing 0.1kg of phenolic resin and 0.1kg of epoxy resin, and uniformly mixing by using a mixer;
step C4: 1kg of the shaped quartz sand particles of 20 to 40 meshes is heated to 270 ℃ and poured into a sand mixer;
step D4: when the temperature of the shaped quartz sand particles reaches 250 ℃, adding the uniformly mixed resin, and uniformly stirring to form a solid-liquid mixture;
step F4: and adding 0.06kg of ethylenediamine into the solid-liquid mixture, and stirring until the mixture is fully solidified to obtain the film-coated propping agent.
Further, the preparation method specifically comprises the following steps:
step A5: adding 2kg of quartz sand particles of 16-20 meshes into a shaping machine, grinding the quartz sand particles to be round until the sphericity is 0.8 to obtain shaped quartz sand particles, and then screening the shaped quartz sand particles of 20-40 meshes for later use;
step B5: weighing 1.5kg of acrylic resin and 1.5kg of epoxy resin, and uniformly mixing by using a mixer;
step C5: weighing 1kg of the shaped quartz sand particles of 20-40 meshes, heating to 270 ℃, and pouring into a sand mixer;
step D5: when the temperature of the shaped quartz sand particles reaches 250 ℃, adding the uniformly mixed resin, and uniformly stirring to form a solid-liquid mixture;
step F5: and adding 0.06kg of triethylene tetramine into the solid-liquid mixture, and stirring until the mixture is fully solidified to obtain the film-coated propping agent.
Further, the preparation method specifically comprises the following steps:
step A60: adding 2kg of quartz sand particles of 30-50 meshes into the mixture, heating the mixture to 180 ℃, and pouring the mixture into a sand mixer;
step A61: under the condition of stirring, pouring 0.2kg of water glass into the quartz sand particles, uniformly stirring, shaping, waiting for complete solidification, and screening the shaped quartz sand particles of 20-40 meshes for later use;
step B6: weighing 1.5kg of acrylic resin and 1.5kg of epoxy resin, and uniformly mixing by using a mixer;
step C7: 1kg of the shaped quartz sand particles of 20 to 40 meshes is heated to 270 ℃ and poured into a sand mixer;
step D8: when the temperature of the shaped quartz sand particles reaches 250 ℃, adding the uniformly mixed resin, and uniformly stirring to form a solid-liquid mixture;
step F6: and adding 0.06kg of triethylene tetramine into the solid-liquid mixture, and stirring until the mixture is fully solidified to obtain the film-coated propping agent.
The film-coated propping agent has the advantages of high sphericity, high strength, easily obtained raw materials, simple process flow, low cost and easy popularization and implementation.
Detailed Description
The present invention will now be described in order to more clearly understand the technical features, objects, and effects of the present invention.
The invention provides a coated proppant, which can be also called a mellow high-strength coated proppant. The coated proppant contains shaped quartz sand particles and an organic coating, wherein the organic coating is applied to the surface of the quartz sand particles and adheres to the surface to produce the coated proppant. The shaping method comprises mechanical shaping and chemical shaping. The mechanical reshaping is accomplished using a commercial reshaping machine. The chemical agent adopted for chemical shaping is water glass.
The organic coating comprises a resin comprising one or more of the following macromolecules: urea-formaldehyde resin, alkyd resin, phenolic resin, acrylic resin, epoxy resin, polyvinylpyrrolidone and the like.
On the basis that the organic coating layer comprises the resin, the organic coating layer also comprises a curing agent, and the curing agent contains one or more of the following compounds: maleic anhydride, ethylenediamine, m-phenylenediamine, triethylene tetramine, polyisocyanate, phthalic anhydride, urotropine, and the like.
The preparation method of the coated proppant comprises the steps of shaping quartz sand particles, coating an organic coating composition on the shaping quartz sand particles, and mixing the shaping quartz sand particles and the organic coating composition to form the round high-strength coated proppant.
The preparation method of the coated proppant comprises the following steps:
(1) weighing a certain amount of quartz sand (particles), and adding into a shaping machine for rounding. When the sphericity of the quartz sand reaches over 0.8, taking out for later use;
(2) weighing a certain amount of two or more resins, and uniformly mixing by using a mixer;
(3) heating the ground quartz sand to 150-350 ℃, and pouring the heated quartz sand into a sand mixer;
(4) when the temperature of the rounding quartz sand reaches 210-240 ℃, adding the resin mixture uniformly mixed in the step (2), and uniformly stirring to form a solid-liquid mixture formed by the shaped quartz sand particles and the resin;
(5) and adding a curing agent into the solid-liquid mixture, and stirring until the curing agent is fully cured.
Thereafter, the solidified solid-liquid mixture is cooled and sieved to obtain the coated proppant of the present invention.
Wherein, relative to 100 parts by weight of rounding quartz sand (shaped quartz sand particles), the content of the resin is 1-10 parts by weight, and the content of the curing agent is 10-30 parts by weight of the resin (namely, the weight of the curing agent is 10-30% of the weight of the resin).
Example 1
1) 2kg of 16-20 mesh quartz sand (particles) is weighed and added into a shaping machine to be rounded until the sphericity is 0.8. Then the inner part is screened by 20 to 40 meshes for standby.
2) Weighing 0.1kg of alkyd resin and 0.1kg of epoxy resin, and uniformly mixing by using a mixer;
3) heating 1kg of 20-40 mesh quartz sand obtained in the step 1) to 270 ℃, and pouring the heated quartz sand into a sand mixer;
4) when the temperature reaches 250 ℃, adding the resin mixture uniformly mixed in the step 2), and uniformly stirring;
5) stirring to fully solidify to obtain the film-coated propping agent.
Example 2
1) 2kg of 30 to 50 mesh quartz sand (granules) were weighed, heated to 150 ℃ and poured into a sand mixer.
2) Under the condition of stirring, 0.2kg of water glass is poured, the mixture is uniformly stirred, the mixture is completely solidified, and the shaped quartz sand (granules) with 20 to 40 meshes is screened for standby.
3) Weighing 0.1kg of alkyd resin and 0.1kg of epoxy resin, and uniformly mixing by using a mixer;
4) heating 1kg of 20-40 mesh quartz sand obtained in the step 2) to 270 ℃, and pouring the heated quartz sand into a sand mixer;
5) when the temperature reaches 250 ℃, adding the resin mixture uniformly mixed in the step 2), and uniformly stirring;
6) stirring to fully solidify to obtain the film-coated propping agent.
Example 3
1) 2kg of 16-20 mesh quartz sand (particles) is weighed and added into a shaping machine to be rounded until the sphericity is 0.8. Then sieving the powder with 20 to 40 meshes for later use;
2) weighing 0.1kg of phenolic resin and 0.1kg of epoxy resin, and uniformly mixing by using a mixer;
3) heating 1kg of 20-40 mesh quartz sand (particles) in the step 1) to 270 ℃, and pouring into a sand mixer;
4) when the temperature reaches 250 ℃, adding the resin mixture uniformly mixed in the step 2), and uniformly stirring;
5) and adding 0.06kg of ethylenediamine into the mixture, and stirring until the mixture is fully cured to obtain the film-coated propping agent.
Example 4
1) 2kg of 30 to 50 mesh quartz sand (granules) are weighed, heated to 180 ℃ and then poured into a sand mixer.
2) Under the condition of stirring, 0.2kg of water glass is poured, the mixture is uniformly stirred, the mixture is completely solidified, and the shaped quartz sand (particles) with 20 to 40 meshes is screened for standby.
3) 0.1kg of phenolic resin and 0.1kg of epoxy resin are weighed and mixed evenly by a mixer.
4) Heating 1kg of 20-40 mesh quartz sand obtained in the step 2) to 270 ℃, and pouring the heated quartz sand into a sand mixer;
5) when the temperature reaches 250 ℃, adding the resin mixture uniformly mixed in the step 3), and uniformly stirring;
6) and adding 0.06kg of ethylenediamine into the mixture, and stirring until the mixture is fully cured to obtain the film-coated propping agent.
Example 5
1) 2kg of 16-20 mesh quartz sand (particles) is weighed and added into a shaping machine to be rounded until the sphericity is 0.8. Then the inner part is screened by 20 to 40 meshes for standby.
2) 0.15kg of acrylic resin and 0.15kg of epoxy resin were weighed and mixed uniformly by a mixer.
3) 1kg of shaped quartz sand with 20 to 40 meshes is heated to 270 ℃ and poured into a sand mixer;
4) when the temperature reaches 250 ℃, adding the resin mixture uniformly mixed in the step 2), and uniformly stirring;
5) and adding 0.6kg of triethylene tetramine into the mixture, and stirring until the mixture is fully solidified to obtain the film-coated proppant.
Example 6
1) Weighing 2kg of 30-50 mesh quartz sand (particles), heating to 180 ℃, and pouring into a sand mixer;
2) under the condition of stirring, 0.2kg of water glass is poured, the mixture is uniformly stirred, the mixture is completely solidified, and quartz sand (particles) shaped by 20 to 40 meshes is screened for later use;
3) 0.15kg of acrylic resin and 0.15kg of epoxy resin were weighed and mixed uniformly by a mixer.
4) Heating 1kg of shaped 20-40 mesh quartz sand for later use to 270 ℃, and pouring the quartz sand into a sand mixer;
5) when the temperature reaches 250 ℃, adding the resin mixture uniformly mixed in the step 3), and uniformly stirring;
6) and adding 0.6kg of triethylene tetramine into the mixture, and stirring until the mixture is fully solidified to obtain the film-coated proppant.
Proppant performance testing:
the blended proppants were tested for fracture rate of 69MPa using the proppant performance test method for hydraulic fracturing and gravel packing operations identified by the trade designation SY-T5108-2014, with the results listed in table 1.
Table 1 fracture ratio of proppant
| Proppant number | Percentage of breakage (%) |
| Example 1 | 0.8 |
| Example 2 | 1.7 |
| Example 3 | 1.1 |
| Example 4 | 0.7 |
| Example 5 | 0.2 |
| Example 6 | 0.6 |
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. In order that the components of the present invention may be combined without conflict, it is intended that all equivalent changes and modifications made by those skilled in the art without departing from the spirit and principles of the present invention shall fall within the protection scope of the present invention.
Claims (1)
1. A preparation method of a coated proppant is used for preparing the coated proppant and is characterized by comprising the following steps:
the preparation method specifically comprises the following steps:
weighing 2kg of 16-20 mesh quartz sand particles, adding into a shaping machine, and rounding to a sphericity of 0.8; then sieving the powder with 20 to 40 meshes for later use;
weighing 0.15kg of acrylic resin and 0.15kg of epoxy resin, and uniformly mixing by using a mixer;
1kg of shaped quartz sand with 20 to 40 meshes is heated to 270 ℃ and poured into a sand mixer;
when the temperature reaches 250 ℃, adding the uniformly mixed resin mixture, and uniformly stirring;
adding 0.6kg of triethylene tetramine into the mixture, and stirring until the mixture is fully solidified to prepare a film-coated propping agent;
the breakage rate of the film-coated propping agent is 0.2%.
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