CN111690399A - Sand control agent for fracturing and use method thereof - Google Patents
Sand control agent for fracturing and use method thereof Download PDFInfo
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- CN111690399A CN111690399A CN202010507708.1A CN202010507708A CN111690399A CN 111690399 A CN111690399 A CN 111690399A CN 202010507708 A CN202010507708 A CN 202010507708A CN 111690399 A CN111690399 A CN 111690399A
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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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G8/00—Condensation polymers of aldehydes or ketones with phenols only
- C08G8/28—Chemically modified polycondensates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G81/00—Macromolecular compounds obtained by interreacting polymers in the absence of monomers, e.g. block polymers
- C08G81/02—Macromolecular compounds obtained by interreacting polymers in the absence of monomers, e.g. block polymers at least one of the polymers being obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C08G81/024—Block or graft polymers containing sequences of polymers of C08C or C08F and of polymers of C08G
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Abstract
The invention discloses a sand control agent for fracturing, which is prepared by the following steps: s1, adding polyacrylamide into the stirred constant-temperature water for curing for 3 hours to obtain polyacrylamide aqueous solution; s2, adding carbamide into the polyacrylamide aqueous solution to obtain a polyacrylamide-carbamide aqueous solution; s3, adding phenolic resin into the polyacrylamide-carbamide aqueous solution, stirring at constant temperature to dissolve, and obtaining a reaction mixture; s4, sequentially and circularly heating the reaction mixture to 70 ℃, 80 ℃, 90 ℃ and 80 ℃, and respectively preserving heat for 1h until the total time of heat preservation is 24h to obtain a water control agent; s5, adding the coated sand into the water control agent, and stirring and mixing uniformly to obtain the sand control agent. The invention has the beneficial effects that the sand control agent is adopted to prevent sand production, and meanwhile, the water control is matched, so that the later use of the oil well successfully fractured is guaranteed.
Description
Technical Field
The invention relates to the field of petroleum. More particularly, the invention relates to a sand control agent for fracturing and a using method thereof.
Background
Petroleum resources are important energy sources, and with the development of economy, the demand of society for petroleum is increasing. In the process of positioning fracturing, the sand control agent is adopted to prevent sand from being produced, and the key link for determining the success of fracturing is provided. Meanwhile, along with the development of oilfield flooding, the water content of the oil well is increased, so that the liquid production of a single well is increased, the flow rate of formation fluid is increased, the dragging force of formation sand is increased, and how to adopt the sand control agent to prevent sand production and cooperate with water control is realized, so that a further guarantee is provided for the later use of the oil well with successful fracturing, and the problem in the development process of the oilfield is solved.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.
The invention also aims to provide a sand control agent for fracturing, which can be used for preventing sand from generating by adopting the sand control agent and simultaneously matching with water control to provide guarantee for later use of an oil well with successful fracturing.
To achieve these objects and other advantages in accordance with the present invention, there is provided a sand control agent for fracturing, prepared by the steps of:
s1, gradually adding polyacrylamide into the stirred constant-temperature water, and curing for 3 hours to obtain 1.5 mass percent of polyacrylamide aqueous solution, wherein the temperature of the constant-temperature water is 60 ℃;
s2, adding carbamide into the polyacrylamide aqueous solution, stirring and dissolving at a constant temperature of 60 ℃ to obtain polyacrylamide-carbamide aqueous solution, wherein the molar ratio of polyacrylamide to carbamide is 3: 2;
s3, adding phenolic resin into the polyacrylamide-carbamide aqueous solution, stirring and dissolving at a constant temperature of 60 ℃ to obtain a reaction mixture, wherein the molar ratio of the polyacrylamide to the phenolic resin is 3: 8;
s4, sequentially and circularly heating the reaction mixture to 70 ℃, 80 ℃, 90 ℃ and 80 ℃, and respectively preserving heat for 1h until the total time of heat preservation is 24h to obtain a water control agent;
s5, preparing the coating sand, and stirring and mixing the water control agent and the coating sand uniformly to obtain the sand control agent.
Preferably, the surface of the fracturing sand is sequentially coated with epoxy resin, ethylene-vinyl acetate copolymer, curing agent and water-soluble polymer to prepare the coated sand, wherein the mass ratio of the fracturing sand, the epoxy resin, the ethylene-vinyl acetate copolymer, the curing agent and the water-soluble polymer is 100:10:1:2-3: 3.
Preferably, the fracturing sand has a particle size of 0.4 to 1 mm.
Preferably, the water-soluble polymer is sodium carboxymethylcellulose.
Preferably, the epoxy resin is at least one of bisphenol A epoxy resin E-51 and polyurethane modified epoxy resin E-42.
Preferably, the curing agent is at least one of 5025B and 2636.
The invention at least comprises the following beneficial effects:
in the preparation process of the water control agent, polyacrylamide, carbamide and phenolic resin are used as raw materials to carry out condensation reaction, wherein the carbamide is added to be matched with the reaction of the polyacrylamide and the phenolic resin to form a condensation compound mixture, at least comprising a carbamide-phenolic resin condensation compound, a polyacrylamide-phenolic resin condensation compound and the like, the condensation conditions are synchronously regulated and controlled, the formation effect of the mixture is enhanced, the gelling speed of the water control agent is effectively improved, and the gelling time of the water control agent is reduced;
the ethylene-vinyl acetate copolymer can effectively block the contact between the epoxy resin and the curing agent, and if and only if the environment temperature of the coating sand meets the requirement of melting the ethylene-vinyl acetate copolymer, the barrier between the epoxy resin and the curing agent is broken, so that the contact reaction is realized, the storage stability of the coating sand is improved, and the ethylene-vinyl acetate copolymer coating sand has better applicability to oil wells with the well temperature higher than the melting temperature of the ethylene-vinyl acetate copolymer.
The sand control agent is matched with water control while effectively preventing sand from being produced, and the aggregation and migration tests of fine particles show that the sand control agent can effectively aggregate solid phases of the fine particles and improve the flow conductivity.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
< example 1>
The sand control agent for fracturing is prepared by the following steps:
s1, gradually adding the aqueous medium dispersion type polyacrylamide into the stirred constant-temperature water, and curing for 3 hours to obtain 1.5 mass percent polyacrylamide aqueous solution, wherein the temperature of the constant-temperature water is 60 ℃;
s2, adding carbamide into the polyacrylamide aqueous solution, stirring and dissolving at constant temperature to obtain polyacrylamide-carbamide aqueous solution, wherein the molar ratio of polyacrylamide to carbamide is 3: 2;
s3, adding phenolic resin into the polyacrylamide-carbamide aqueous solution, stirring at constant temperature to dissolve, and obtaining a reaction mixture, wherein the molar ratio of the polyacrylamide to the phenolic resin is 3:8, and the phenolic resin is water-soluble phenolic resin;
s4, sequentially and circularly heating the reaction mixture to 70 ℃, 80 ℃, 90 ℃ and 80 ℃, and respectively preserving heat for 1h until the total heat preservation time is 24h to obtain a water control agent, which specifically comprises the following steps: forming a cycle at 70 deg.C, 80 deg.C, 90 deg.C, 80 deg.C, and then performing downward moving cycle at 70 deg.C, 80 deg.C, 90 deg.C, 80 deg.C, repeating the cycle for 6 times to keep the temperature for 24 hr;
s5, preparing coating sand, adding the coating sand into the water control agent, and stirring and mixing uniformly to obtain the sand control agent (before use, the water control agent and the coating sand are stored separately).
< example 2>
The sand control agent for fracturing is prepared by the following steps:
s1, gradually adding polyacrylamide into the stirred constant-temperature water, and curing for 3 hours to obtain 1.5 mass percent of polyacrylamide aqueous solution, wherein the temperature of the constant-temperature water is 60 ℃;
s2, adding carbamide into the polyacrylamide aqueous solution, stirring at constant temperature to dissolve, and obtaining polyacrylamide-carbamide aqueous solution, wherein the molar ratio of polyacrylamide to carbamide is 3:2, and the phenolic resin is water-soluble phenolic resin;
s3, adding phenolic resin into the polyacrylamide-carbamide aqueous solution, stirring at constant temperature to dissolve, and obtaining a reaction mixture, wherein the molar ratio of the polyacrylamide to the phenolic resin is 3: 8;
s4, sequentially and circularly heating the reaction mixture to 70 ℃, 80 ℃, 90 ℃ and 80 ℃, and respectively preserving heat for 1h until the total heat preservation time is 24h to obtain a water control agent, which specifically comprises the following steps: forming a cycle at 70 deg.C, 80 deg.C, 90 deg.C, 80 deg.C, and then performing downward moving cycle at 70 deg.C, 80 deg.C, 90 deg.C, 80 deg.C, repeating the cycle for 6 times to keep the temperature for 24 hr;
s5, sequentially coating bisphenol A epoxy resin E-51, an ethylene-vinyl acetate copolymer, 2636 and sodium hydroxymethyl cellulose on the surface of fracturing sand to prepare coated sand, adding the coated sand into a water control agent, and uniformly stirring and mixing to obtain the sand control agent, wherein the particle size of the fracturing sand is 0.4-1mm, and the mass ratio of the fracturing sand, the bisphenol A epoxy resin E-51, the ethylene-vinyl acetate copolymer, 2636 and the sodium hydroxymethyl cellulose is 100:10:1:3: 3.
< example 3>
The sand control agent for fracturing is prepared by the following steps:
s1, gradually adding polyacrylamide into the stirred constant-temperature water, and curing for 3 hours to obtain 1.5 mass percent of polyacrylamide aqueous solution, wherein the temperature of the constant-temperature water is 60 ℃;
s2, adding carbamide into the polyacrylamide aqueous solution, stirring and dissolving at constant temperature to obtain polyacrylamide-carbamide aqueous solution, wherein the molar ratio of polyacrylamide to carbamide is 3: 2;
s3, adding phenolic resin into the polyacrylamide-carbamide aqueous solution, stirring at constant temperature to dissolve, and obtaining a reaction mixture, wherein the molar ratio of the polyacrylamide to the phenolic resin is 3:8, and the phenolic resin is water-soluble phenolic resin;
s4, sequentially and circularly heating the reaction mixture to 70 ℃, 80 ℃, 90 ℃ and 80 ℃, and respectively preserving heat for 1h until the total heat preservation time is 24h to obtain a water control agent, which specifically comprises the following steps: forming a cycle at 70 deg.C, 80 deg.C, 90 deg.C, 80 deg.C, and then performing downward moving cycle at 70 deg.C, 80 deg.C, 90 deg.C, 80 deg.C, repeating the cycle for 6 times to keep the temperature for 24 hr;
s5, sequentially coating polyurethane modified epoxy resin E-42, an ethylene-vinyl acetate copolymer, 5025B and sodium hydroxymethyl cellulose on the surface of fracturing sand to prepare coated sand, adding the coated sand into a water control agent, and uniformly stirring and mixing to obtain the sand control agent, wherein the particle size of the fracturing sand is 0.4-1mm, and the mass ratio of the fracturing sand, the polyurethane modified epoxy resin E-42, the ethylene-vinyl acetate copolymer, 5025B and the sodium hydroxymethyl cellulose is 100:10:1:3: 3.
When the water control agent is used, the water control agent and the coating sand are mixed according to a certain proportion (determined according to actual requirements) and pumped into a stratum.
< comparative example 1>
The water control agent is prepared by the following steps:
s1, gradually adding the aqueous medium dispersion type polyacrylamide into the stirred constant-temperature water, and curing for 3 hours to obtain 1.5 mass percent polyacrylamide aqueous solution, wherein the temperature of the constant-temperature water is 60 ℃;
s2, adding phenolic resin into the polyacrylamide aqueous solution, stirring at constant temperature to dissolve, and obtaining a reaction mixture, wherein the molar ratio of the polyacrylamide to the phenolic resin is 3: 8;
s4, heating the reaction mixture to 80 ℃, and keeping the temperature for 24h to obtain the water control agent.
< comparative example 2>
The sand control agent for fracturing is prepared by the following steps:
S1-S4, same as steps S1-S4 of example 2;
s5, sequentially coating bisphenol A epoxy resin E-51, 2636 and sodium hydroxymethyl cellulose on the surface of the fracturing sand, wherein the mass ratio of the fracturing sand to the bisphenol A epoxy resin E-51 to 2636 to the sodium hydroxymethyl cellulose is 100:10:3:3, adding the coated sand into the water control agent, and stirring and mixing uniformly to obtain the sand control agent, wherein the particle size of the fracturing sand is 0.4-1 mm.
< comparative example 3>
The sand control agent for fracturing is prepared by the following steps:
S1-S4, same as steps S1-S4 of example 3;
s5, sequentially coating polyurethane modified epoxy resin E-42, 5025B and sodium hydroxymethyl cellulose on the surface of the fracturing sand, wherein the mass ratio of the fracturing sand to the polyurethane modified epoxy resin E-42 to 5025B to the sodium hydroxymethyl cellulose is 100:10:3:3, adding the coated sand into the water control agent, and stirring and mixing uniformly to obtain the sand control agent, wherein the particle size of the fracturing sand is 0.4-1 mm.
< gelling time experiment >
The gelling time of the water control agents of example 1 and comparative example 1 is measured by a visual code method, and the gelling time of the water control agent of example 1 is obviously shorter than that of the water control agent of comparative example 1, and the reason is that in the preparation process of the water control agent of example 1, polyacrylamide, carbamide and phenolic resin are used as raw materials to carry out condensation reaction to form a condensation compound mixture, at least comprising a carbamide-phenolic resin condensation compound, a polyacrylamide-phenolic resin condensation compound and the like, the condensation conditions are synchronously regulated and controlled to enhance the forming effect of the mixture, further, the gelling speed of the water control agent is effectively improved, and the gelling time of the water control agent is reduced;
< diversion capability test >
Taking 12 50mL test tubes with plugs, respectively placing 20-40 mesh ceramsite sand in different test tubes, and recording the initial height h of the ceramsite sand0Then equally dividing into 3 parts, respectively adding the sand control agents prepared in the example 2, the example 3, the comparative example 2 and the comparative example 3 into each part, respectively shaking at room temperature, 80 ℃ and 120 ℃, and recording the final height h of the ceramsite sand after standing1And calculating to obtain the height difference △ h-h of the ceramsite sand1-h0And the percentage increase in height is △ h/h0Specifically, the following table 1 shows:
TABLE 1
The ethylene-vinyl acetate copolymer can effectively block the contact between the epoxy resin and the curing agent, and if and only if the environmental temperature of the coating sand meets the requirement of melting the ethylene-vinyl acetate copolymer, the barrier between the epoxy resin and the curing agent is broken, the contact reaction is realized, the storage stability of the coating sand is improved, and the ethylene-vinyl acetate copolymer coating sand has better applicability to oil wells with the well temperature higher than the melting temperature of the ethylene-vinyl acetate copolymer;
as can be seen from table 1, the films formed from the ethylene-vinyl acetate copolymers of examples 2 and 3 did not crack effectively at room temperature, so that the percentage increase in height of comparative examples 2 and 3 was higher than that of the corresponding examples;
at the temperature of 80 ℃, the films formed by the ethylene-vinyl acetate copolymers in the examples 2 and 3 are effectively cracked, and the water-soluble sodium carboxymethyl cellulose is cracked, so that the epoxy resin and the curing agent in the examples 2 and 3 are fully contacted;
the films formed by the ethylene-vinyl acetate copolymers in the examples 2 and 3 are rapidly and effectively cracked at the temperature of 120 ℃, and the water-soluble sodium carboxymethyl cellulose is cracked at the same time, so that the epoxy resin and the curing agent in the examples 2 and 3 are contacted at the first time;
the sand control agents prepared in the embodiments 2 and 3 can increase the height of the ceramsite sand by more than 12.65% at a temperature of more than 80 ℃, namely, the sand control agents have the capability of improving the flow conductivity.
< aggregation of Fine particles, migration test >
The sand control agent prepared in the embodiment 2 and the embodiment 3 is added into the coal powder and the fine silt, the mixture is heated and kept stand for 40min at the constant temperature of 80 ℃, and the solid phase is observed, so that the coal powder and the fine silt particle solid phase are effectively aggregated, and no obvious solid phase flows out.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details given herein and to the embodiments shown and described without departing from the generic concept as defined by the claims and their equivalents.
Claims (7)
1. The sand control agent for fracturing is characterized by being prepared by the following steps:
s1, gradually adding polyacrylamide into the stirred constant-temperature water, and curing for 3 hours to obtain 1.5 mass percent of polyacrylamide aqueous solution, wherein the temperature of the constant-temperature water is 60 ℃;
s2, adding carbamide into the polyacrylamide aqueous solution, stirring and dissolving at a constant temperature of 60 ℃ to obtain polyacrylamide-carbamide aqueous solution, wherein the molar ratio of polyacrylamide to carbamide is 3: 2;
s3, adding phenolic resin into the polyacrylamide-carbamide aqueous solution, stirring and dissolving at a constant temperature of 60 ℃ to obtain a reaction mixture, wherein the molar ratio of the polyacrylamide to the phenolic resin is 3: 8;
s4, sequentially and circularly heating the reaction mixture to 70 ℃, 80 ℃, 90 ℃ and 80 ℃, and respectively preserving heat for 1h until the total time of heat preservation is 24h to obtain a water control agent;
s5, preparing the coating sand, and stirring and mixing the water control agent and the coating sand uniformly to obtain the sand control agent.
2. The sand control agent for fracturing as claimed in claim 1, wherein the surface of the fracturing sand is coated with epoxy resin, ethylene-vinyl acetate copolymer, curing agent and water-soluble polymer in sequence to obtain the coated sand, wherein the mass ratio of the fracturing sand, the epoxy resin, the ethylene-vinyl acetate copolymer, the curing agent and the water-soluble polymer is 100:10:1:2-3: 3.
3. The sand control agent for fracturing as claimed in claim 2, wherein the fracturing sand has a particle size of 0.4 to 1 mm.
4. The sand control agent for fracturing of claim 2, wherein the water-soluble polymer is sodium carboxymethylcellulose.
5. The sand control agent for fracturing as claimed in claim 2, wherein the epoxy resin is at least one of bisphenol a epoxy resin E-51 and urethane-modified epoxy resin E-42.
6. The sand control agent for fracturing of claim 2, wherein the curing agent is at least one of 5025B and 2636.
7. The use method of the sand control agent for fracturing as claimed in any one of claims 1 to 6, wherein the storage time control agent and the coated sand are stored separately, and the storage time control agent and the coated sand are injected after being stirred and mixed uniformly.
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| CN2020103465190 | 2020-04-27 | ||
| CN202010346519 | 2020-04-27 |
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Cited By (1)
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| CN116162216A (en) * | 2023-04-20 | 2023-05-26 | 山东宇世巨化工有限公司 | Preparation method of epoxy resin modified phenolic resin for petroleum fracturing sand |
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| CN111690399B (en) | 2021-09-07 |
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