CN117264620A - Oilfield fracturing high-temperature-resistant degradable temporary plugging agent and preparation method thereof - Google Patents
Oilfield fracturing high-temperature-resistant degradable temporary plugging agent and preparation method thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title abstract description 14
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 62
- 239000002667 nucleating agent Substances 0.000 claims abstract description 27
- 239000004014 plasticizer Substances 0.000 claims abstract description 27
- 229920002472 Starch Polymers 0.000 claims abstract description 25
- 239000012760 heat stabilizer Substances 0.000 claims abstract description 25
- 239000000314 lubricant Substances 0.000 claims abstract description 25
- 235000019698 starch Nutrition 0.000 claims abstract description 25
- 239000008107 starch Substances 0.000 claims abstract description 25
- 229920000954 Polyglycolide Polymers 0.000 claims abstract description 24
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Polymers OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 18
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 18
- CURLTUGMZLYLDI-UHFFFAOYSA-N carbon dioxide Natural products O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229920001577 copolymer Polymers 0.000 claims abstract description 18
- 239000003921 oil Substances 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 10
- AXKZIDYFAMKWSA-UHFFFAOYSA-N 1,6-dioxacyclododecane-7,12-dione Chemical compound O=C1CCCCC(=O)OCCCCO1 AXKZIDYFAMKWSA-UHFFFAOYSA-N 0.000 claims abstract description 3
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 claims abstract description 3
- 238000002156 mixing Methods 0.000 claims description 24
- 239000000203 mixture Substances 0.000 claims description 23
- -1 sebacic acid ester Chemical class 0.000 claims description 21
- 229920001707 polybutylene terephthalate Polymers 0.000 claims description 15
- 239000004593 Epoxy Substances 0.000 claims description 12
- UQLDLKMNUJERMK-UHFFFAOYSA-L di(octadecanoyloxy)lead Chemical compound [Pb+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O UQLDLKMNUJERMK-UHFFFAOYSA-L 0.000 claims description 12
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 12
- 229930195729 fatty acid Natural products 0.000 claims description 12
- 239000000194 fatty acid Substances 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 8
- 238000005303 weighing Methods 0.000 claims description 8
- FMZUHGYZWYNSOA-VVBFYGJXSA-N (1r)-1-[(4r,4ar,8as)-2,6-diphenyl-4,4a,8,8a-tetrahydro-[1,3]dioxino[5,4-d][1,3]dioxin-4-yl]ethane-1,2-diol Chemical compound C([C@@H]1OC(O[C@@H]([C@@H]1O1)[C@H](O)CO)C=2C=CC=CC=2)OC1C1=CC=CC=C1 FMZUHGYZWYNSOA-VVBFYGJXSA-N 0.000 claims description 6
- 229920002261 Corn starch Polymers 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000008120 corn starch Substances 0.000 claims description 6
- 229940087101 dibenzylidene sorbitol Drugs 0.000 claims description 6
- ZUDYLZOBWIAUPC-UHFFFAOYSA-L disodium;pentanedioate Chemical compound [Na+].[Na+].[O-]C(=O)CCCC([O-])=O ZUDYLZOBWIAUPC-UHFFFAOYSA-L 0.000 claims description 6
- LYRFLYHAGKPMFH-UHFFFAOYSA-N octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(N)=O LYRFLYHAGKPMFH-UHFFFAOYSA-N 0.000 claims description 6
- 229920005989 resin Polymers 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- QMMJWQMCMRUYTG-UHFFFAOYSA-N 1,2,4,5-tetrachloro-3-(trifluoromethyl)benzene Chemical compound FC(F)(F)C1=C(Cl)C(Cl)=CC(Cl)=C1Cl QMMJWQMCMRUYTG-UHFFFAOYSA-N 0.000 claims description 4
- 229920002943 EPDM rubber Polymers 0.000 claims description 4
- MTUBBMSQXXJFQP-UHFFFAOYSA-N OC(CCCCCCCCCCCCCCCCC(=O)OCC(O)CO)(O)O Chemical compound OC(CCCCCCCCCCCCCCCCC(=O)OCC(O)CO)(O)O MTUBBMSQXXJFQP-UHFFFAOYSA-N 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- CXMXRPHRNRROMY-UHFFFAOYSA-N n-Decanedioic acid Natural products OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 claims description 4
- 235000019198 oils Nutrition 0.000 claims description 4
- 229920000515 polycarbonate Polymers 0.000 claims description 4
- 239000004417 polycarbonate Substances 0.000 claims description 4
- 229920001296 polysiloxane Polymers 0.000 claims description 4
- 235000012424 soybean oil Nutrition 0.000 claims description 4
- 239000003549 soybean oil Substances 0.000 claims description 4
- 229940074404 sodium succinate Drugs 0.000 claims description 3
- ZDQYSKICYIVCPN-UHFFFAOYSA-L sodium succinate (anhydrous) Chemical compound [Na+].[Na+].[O-]C(=O)CCC([O-])=O ZDQYSKICYIVCPN-UHFFFAOYSA-L 0.000 claims description 3
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 2
- XNGIFLGASWRNHJ-UHFFFAOYSA-L phthalate(2-) Chemical compound [O-]C(=O)C1=CC=CC=C1C([O-])=O XNGIFLGASWRNHJ-UHFFFAOYSA-L 0.000 claims description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 2
- UDWXLZLRRVQONG-UHFFFAOYSA-M sodium hexanoate Chemical compound [Na+].CCCCCC([O-])=O UDWXLZLRRVQONG-UHFFFAOYSA-M 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims 1
- 229940040452 linolenate Drugs 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 5
- 238000012423 maintenance Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 17
- WSQZNZLOZXSBHA-UHFFFAOYSA-N 3,8-dioxabicyclo[8.2.2]tetradeca-1(12),10,13-triene-2,9-dione Chemical compound O=C1OCCCCOC(=O)C2=CC=C1C=C2 WSQZNZLOZXSBHA-UHFFFAOYSA-N 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 229920005586 poly(adipic acid) Polymers 0.000 description 8
- 230000015556 catabolic process Effects 0.000 description 6
- 238000006731 degradation reaction Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- KDYFGRWQOYBRFD-UHFFFAOYSA-L succinate(2-) Chemical compound [O-]C(=O)CCC([O-])=O KDYFGRWQOYBRFD-UHFFFAOYSA-L 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 125000005498 phthalate group Chemical group 0.000 description 2
- 229940037312 stearamide Drugs 0.000 description 2
- RKDVKSZUMVYZHH-UHFFFAOYSA-N 1,4-dioxane-2,5-dione Chemical compound O=C1COC(=O)CO1 RKDVKSZUMVYZHH-UHFFFAOYSA-N 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 229920006238 degradable plastic Polymers 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
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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
- C09K8/62—Compositions for forming crevices or fractures
-
- 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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
-
- 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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/516—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls characterised by their form or by the form of their components, e.g. encapsulated material
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses an oilfield fracturing high-temperature-resistant degradable temporary plugging agent which is prepared from the following raw materials in parts by weight: 70-80 parts of polyglycolide, 20-30 parts of carbon dioxide copolymer, 5-15 parts of poly (butylene adipate/terephthalate), 10-20 parts of starch, 1-4 parts of plasticizer, 3-8 parts of compatilizer, 1-10 parts of lubricant, 1-3 parts of heat stabilizer and 0.5-4 parts of nucleating agent. The invention also discloses a preparation method of the oilfield fracturing high-temperature-resistant degradable temporary plugging agent. The invention adopts the oil field fracturing high-temperature-resistant degradable temporary plugging agent, and solves the problems of poor plugging effect, such as poor strength, poor toughness, poor thermal stability under high temperature conditions, difficult maintenance of stable bearing strength and the like of the temporary plugging agent in the prior art.
Description
Technical Field
The invention relates to the technical field of temporary plugging fracturing exploration and development of oil and gas wells, in particular to an oilfield fracturing high-temperature-resistant degradable temporary plugging agent and a preparation method thereof.
Background
It is well known that oil and gas resources such as oil and gas are produced by producing wells (oil or gas wells, sometimes collectively referred to as "wells") containing porous and permeable subterranean formations. In recent years, however, as oil and gas fields continue to be produced, the quality of the reservoirs has degraded year by year, and for this reason, related oil and gas producers have mostly employed reservoir fracturing engineering to improve the permeability of underground reservoirs so as to continue to efficiently produce oil and gas resources from these underground reservoirs. In order to be able to replace to some extent the traditional multi-layer general fracturing technique, more and more researchers have started to study temporary plugging diverting fracturing techniques with the aim of fracture diversion.
In recent years, more than 95% of the joint temporary plugging materials (blastholes temporary plugging) for horizontal wells of various large oil fields are conventional temporary plugging balls, and the conventional temporary plugging balls are generally made of wax, rubber, non-degradable plastics, alloy and degradable materials; the wax ball can be dissolved under a certain temperature condition, but has lower compressive strength and unstable plugging, and particularly can not be compacted under the condition of higher formation fracture pressure, so that the existing temporary plugging steering can not be carried out; temporary plugging balls made of an alloy (such as magnesium alloy) are high in rigidity and strength, but can be dissolved only under a high ion concentration, and have residues after dissolution, so that pollution to an underground reservoir is easy to cause; temporary plugging balls made of degradable temporary plugging materials are poor in most strength and toughness, poor in thermal stability under high-temperature conditions, easy to lose strength rapidly, and difficult to maintain stable bearing effect. The temporary plugging ball setting effect is sensitive to the construction displacement and the number of gun eyes in a shaft, and the plugging effect is not ideal.
The existing temporary plugging ball cannot have ideal strength and toughness at high temperature, has poor temperature resistance, and is difficult to maintain stable bearing strength. In view of the above technical problems, there is a need to develop a temporary plugging agent for a joint, which is both rigid and flexible under high temperature conditions and is degradable, in terms of materials, structures and the like.
Disclosure of Invention
The invention aims to provide an oilfield fracturing high-temperature-resistant degradable temporary plugging agent, which solves the problems of poor strength, poor toughness, poor thermal stability under high temperature conditions, difficulty in maintaining stable pressure-bearing strength and the like of the temporary plugging agent in the prior art. The invention further aims to provide a preparation method of the oilfield fracturing high-temperature-resistant degradable temporary plugging agent.
The invention provides an oilfield fracturing high-temperature-resistant degradable temporary plugging agent which is prepared from the following components in parts by weight: 70-80 parts of polyglycolide, 20-30 parts of carbon dioxide copolymer, 5-15 parts of poly (butylene adipate/terephthalate), 10-20 parts of starch, 2-6 parts of plasticizer, 5-10 parts of compatilizer, 1-10 parts of lubricant, 1-3 parts of heat stabilizer and 0.5-4 parts of nucleating agent.
Preferably, the starch is corn starch, and the plasticizer is one or more of phthalate, sebacic acid ester, epoxidized soybean oil and epoxidized methyl acetyllinoleate.
Preferably, the compatilizer is one or more of polycarbonate, polysiloxane, organic silicon resin, ethylene-vinyl acetate copolymer and ethylene-propylene-diene monomer copolymer.
Preferably, the nucleating agent is one or more of sodium dibenzylidene sorbitol succinate, sodium glutarate and sodium caproate.
Preferably, the lubricant is one of stearic acid amide, butyl stearate and glycerol trihydroxystearate.
Preferably, the heat stabilizer is a mixture of lead stearate and epoxy fatty acid ester.
The preparation method of the oilfield fracturing high-temperature-resistant degradable temporary plugging agent comprises the following steps:
step 1: weighing raw materials of each component according to parts by weight, drying the weighed polyglycolide, carbon dioxide copolymer and poly (butylene terephthalate) at 100-130 ℃ respectively, and uniformly mixing to obtain a mixture;
step 2: adding the mixture obtained in the step 1 into a mixer, then adding starch and a nucleating agent, mixing uniformly, then sequentially adding a compatilizer, a plasticizer, a heat stabilizer and a lubricant, and fully and uniformly mixing to obtain a premix;
step 3: granulating the prepared premix by a double-screw extruder to obtain the degradable temporary plugging agent.
The oilfield fracturing high-temperature-resistant degradable temporary plugging agent and the preparation method thereof have the advantages and positive effects that:
1. according to the invention, the carbon dioxide copolymer and the starch are added into the polyglycolide, so that the degradability of the temporary plugging agent is improved, the degradation speed is increased, the influence on flowback and oil gas yield is avoided, the starch improves the degradability, the mechanical property of the temporary plugging agent is improved, the strength of the temporary plugging agent is improved, and no residue is generated after degradation, so that the underground reservoir is not polluted.
2. The temporary plugging agent is added with the poly (adipic acid)/butylene terephthalate, and has better compatibility with the poly (glycolide) under the action of the compatilizer, so that the material system is endowed with certain toughness, the influence of the rigidity of the poly (glycolic acid) on a final material system can be properly reduced, and temporary plugging agent particles with certain toughness can be properly deformed under the action of underground stratum, thereby being beneficial to mutually stacking the temporary plugging agent particles to form a relatively compact plugging layer and further being beneficial to maintaining stable bearing strength.
3. The addition of the nucleating agent is beneficial to improving the crystallization speed of the polyglycolide, improving the crystallinity of the polyglycolide, improving the high temperature resistance of a material system, improving the thermal stability of the temporary plugging agent under the high temperature condition by compounding the heat stabilizer and the plasticizer, further enabling the temporary plugging agent under the high temperature condition to maintain the mechanical strength of the temporary plugging agent in a period of time, effectively preventing the plugging layer from rapid collapse, and further effectively ensuring the smooth performance of temporary plugging turning fracturing construction.
The technical scheme of the present invention is described in further detail below by examples and comparative examples.
Detailed Description
The technical scheme of the invention is further described by examples and comparative examples.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
Example 1
The oilfield fracturing high-temperature-resistant degradable temporary plugging agent is prepared from the following components in parts by weight: 70 parts of polyglycolide, 20 parts of carbon dioxide copolymer, 5 parts of poly (adipic acid)/butylene terephthalate, 10 parts of starch, 2 parts of plasticizer, 4 parts of compatilizer, 2 parts of lubricant, 1 part of heat stabilizer and 1 part of nucleating agent.
The starch is corn starch, and the plasticizer is phthalate. The compatibilizer is an ethylene-propylene-diene monomer copolymer. The nucleating agent is sodium dibenzylidene sorbitol succinate. The lubricant is a stearamide. The heat stabilizer is a mixture of lead stearate and epoxy fatty acid ester, and the mass ratio of the lead stearate to the epoxy fatty acid ester is 1:2.
the preparation method of the oilfield fracturing high-temperature-resistant degradable temporary plugging agent comprises the following steps:
step 1: weighing raw materials of each component according to parts by weight, drying the weighed polyglycolide, carbon dioxide copolymer and poly (butylene terephthalate) at 100 ℃ respectively, and uniformly mixing to obtain a mixture;
step 2: adding the mixture obtained in the step 1 into a mixer, then adding starch and a nucleating agent, mixing uniformly, then sequentially adding a compatilizer, a plasticizer, a heat stabilizer and a lubricant, and fully and uniformly mixing to obtain a premix;
step 3: granulating the prepared premix by a double-screw extruder to obtain the degradable temporary plugging agent.
Example 2
The oilfield fracturing high-temperature-resistant degradable temporary plugging agent is prepared from the following components in parts by weight: 75 parts of polyglycolide, 25 parts of carbon dioxide copolymer, 10 parts of poly (adipic acid)/butylene terephthalate, 15 parts of starch, 3 parts of plasticizer, 5 parts of compatilizer, 4 parts of lubricant, 1.5 parts of heat stabilizer and 2 parts of nucleating agent.
The starch is corn starch, and the plasticizer is sebacic acid ester. The compatilizer is organic silicon resin. The nucleating agent is sodium glutarate. The lubricant is butyl stearate. The heat stabilizer is a mixture of lead stearate and epoxy fatty acid ester, and the mass ratio of the lead stearate to the epoxy fatty acid ester is 1:2.
the preparation method of the oilfield fracturing high-temperature-resistant degradable temporary plugging agent comprises the following steps:
step 1: weighing raw materials of each component according to parts by weight, drying the weighed polyglycolide, carbon dioxide copolymer and poly (butylene terephthalate) at 115 ℃ respectively, and uniformly mixing to obtain a mixture;
step 2: adding the mixture obtained in the step 1 into a mixer, then adding starch and a nucleating agent, mixing uniformly, then sequentially adding a compatilizer, a plasticizer, a heat stabilizer and a lubricant, and fully and uniformly mixing to obtain a premix;
step 3: granulating the prepared premix by a double-screw extruder to obtain the degradable temporary plugging agent.
Example 3
The oilfield fracturing high-temperature-resistant degradable temporary plugging agent is prepared from the following components in parts by weight: 80 parts of polyglycolide, 30 parts of carbon dioxide copolymer, 15 parts of poly (adipic acid)/butylene terephthalate, 20 parts of starch, 4 parts of plasticizer, 6 parts of compatilizer, 5 parts of lubricant, 3 parts of heat stabilizer and 2.5 parts of nucleating agent.
The starch is corn starch, and the plasticizer is epoxidized soybean oil and epoxidized methyl acetyllinoleate. The compatilizer is polycarbonate, polysiloxane and organic silicon resin. The nucleating agent is dibenzylidene sorbitol sodium succinate and sodium glutarate. The lubricant is glycerol trihydroxystearate. The heat stabilizer is a mixture of lead stearate and epoxy fatty acid ester, and the mass ratio of the lead stearate to the epoxy fatty acid ester is 1:2.
the preparation method of the oilfield fracturing high-temperature-resistant degradable temporary plugging agent comprises the following steps:
step 1: weighing raw materials of each component according to parts by weight, drying the weighed polyglycolide, carbon dioxide copolymer and poly (butylene terephthalate) at 125 ℃ respectively, and uniformly mixing to obtain a mixture;
step 2: adding the mixture obtained in the step 1 into a mixer, then adding starch and a nucleating agent, mixing uniformly, then sequentially adding a compatilizer, a plasticizer, a heat stabilizer and a lubricant, and fully and uniformly mixing to obtain a premix;
step 3: granulating the prepared premix by a double-screw extruder to obtain the degradable temporary plugging agent.
Comparative example 1
The oilfield fracturing high-temperature-resistant degradable temporary plugging agent is prepared from the following components in parts by weight: 70 parts of polyglycolide, 5 parts of poly (adipic acid)/butylene terephthalate, 2 parts of plasticizer, 4 parts of compatilizer, 2 parts of lubricant, 1 part of heat stabilizer and 1 part of nucleating agent.
The plasticizer is phthalate. The compatibilizer is an ethylene-propylene-diene monomer copolymer. The nucleating agent is sodium dibenzylidene sorbitol succinate. The lubricant is a stearamide. The heat stabilizer is a mixture of lead stearate and epoxy fatty acid ester, and the mass ratio of the lead stearate to the epoxy fatty acid ester is 1:2.
the preparation method of the oilfield fracturing high-temperature-resistant degradable temporary plugging agent comprises the following steps:
step 1: weighing raw materials of each component according to parts by weight, drying the weighed polyglycolide and poly (adipic acid)/butylene terephthalate at 100 ℃ respectively, and uniformly mixing to obtain a mixture;
step 2: adding the mixture obtained in the step 1 into a mixer, then adding a nucleating agent, uniformly mixing, then sequentially adding a compatilizer, a plasticizer, a heat stabilizer and a lubricant, and fully and uniformly mixing to obtain a premix;
step 3: granulating the prepared premix by a double-screw extruder to obtain the degradable temporary plugging agent.
Comparative example 2
The oilfield fracturing high-temperature-resistant degradable temporary plugging agent is prepared from the following components in parts by weight: 75 parts of polyglycolide, 25 parts of carbon dioxide copolymer, 10 parts of poly (adipic acid)/butylene terephthalate, 3 parts of plasticizer, 5 parts of compatilizer, 4 parts of lubricant, 1.5 parts of heat stabilizer and 2 parts of nucleating agent.
The plasticizer is sebacic acid ester. The compatilizer is organic silicon resin. The nucleating agent is sodium glutarate. The lubricant is butyl stearate. The heat stabilizer is a mixture of lead stearate and epoxy fatty acid ester, and the mass ratio of the lead stearate to the epoxy fatty acid ester is 1:2.
the preparation method of the oilfield fracturing high-temperature-resistant degradable temporary plugging agent comprises the following steps:
step 1: weighing raw materials of each component according to parts by weight, drying the weighed polyglycolide, carbon dioxide copolymer and poly (butylene terephthalate) at 115 ℃ respectively, and uniformly mixing to obtain a mixture;
step 2: adding the mixture obtained in the step 1 into a mixer, then adding a nucleating agent, uniformly mixing, then sequentially adding a compatilizer, a plasticizer, a heat stabilizer and a lubricant, and fully and uniformly mixing to obtain a premix;
step 3: granulating the prepared premix by a double-screw extruder to obtain the degradable temporary plugging agent.
Comparative example 3
The oilfield fracturing high-temperature-resistant degradable temporary plugging agent is prepared from the following components in parts by weight: 80 parts of polyglycolide, 30 parts of carbon dioxide copolymer, 15 parts of poly (adipic acid)/butylene terephthalate, 20 parts of starch, 4 parts of plasticizer, 6 parts of compatilizer, 5 parts of lubricant and 2.5 parts of nucleating agent.
The starch is corn starch, and the plasticizer is epoxidized soybean oil and epoxidized methyl acetyllinoleate. The compatilizer is polycarbonate, polysiloxane and organic silicon resin. The nucleating agent is dibenzylidene sorbitol sodium succinate and sodium glutarate. The lubricant is glycerol trihydroxystearate.
The preparation method of the oilfield fracturing high-temperature-resistant degradable temporary plugging agent comprises the following steps:
step 1: weighing raw materials of each component according to parts by weight, drying the weighed polyglycolide, carbon dioxide copolymer and poly (butylene terephthalate) at 125 ℃ respectively, and uniformly mixing to obtain a mixture;
step 2: adding the mixture obtained in the step 1 into a mixer, then adding starch and a nucleating agent, mixing uniformly, then sequentially adding a compatilizer, a plasticizer and a lubricant, and fully and uniformly mixing to obtain a premix;
step 3: granulating the prepared premix by a double-screw extruder to obtain the degradable temporary plugging agent.
Performance tests were performed on examples 1-3 and comparative examples 1-3, respectively, and the test results are shown in table 1.
Table 1 test results
| Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 | |
| 100 ℃ pressure-bearing and MPa | 73.4 | 72.6 | 70.4 | 62.9 | 55.4 | 36.4 |
| 120 ℃ pressure-bearing and MPa | 71.2 | 701.1 | 68.3 | 58.4 | 52.1 | 32.3 |
| Bearing pressure at 150 ℃ and MPa | 68.6 | 68.4 | 66.2 | 56.3 | 50.4 | 30.4 |
| Initial degradation time, hours | 82 | 89 | 86 | 116 | 106 | 90 |
| Time of complete degradation, dayNumber of digits | 9 | 10 | 8 | 16 | 14.5 | 10 |
As shown in table 1, comparative example 1 was less effective than examples 1-3 without adding carbon dioxide copolymer and starch, comparative example 1 was less effective than examples 1-3 in terms of high temperature pressure-bearing and degradation time, comparative example 2 was less effective than examples 1-3 and comparative example 1 without adding starch, comparative example 2 was less effective than examples 1-3 and comparative example 1 without adding heat stabilizer, and comparative example 3 was less effective than examples 1-3 and comparative example 1-2 in terms of high temperature pressure-bearing.
Table 1 shows that by adding carbon dioxide copolymer and starch to polyglycolide, the degradability of the temporary plugging agent is improved, the degradation speed is increased, the starch improves the degradability, and the mechanical property and the strength of the temporary plugging agent are improved. The addition of the nucleating agent in the temporary plugging agent is beneficial to improving the crystallization speed of the polyglycolide, improving the crystallinity of the polyglycolide, improving the high temperature resistance of a material system, improving the thermal stability of the temporary plugging agent under the high temperature condition by compounding the heat stabilizer and the plasticizer, further enabling the temporary plugging agent under the high temperature condition to maintain the mechanical strength of the temporary plugging agent in a period of time, effectively preventing the plugging layer from rapid collapse, and further effectively ensuring smooth temporary plugging steering fracturing construction.
Therefore, the oil field fracturing high-temperature-resistant degradable temporary plugging agent and the preparation method thereof solve the problems that the temporary plugging agent in the prior art is poor in strength, poor in toughness, poor in thermal stability under high temperature conditions, difficult to maintain stable pressure-bearing strength and the like, and poor in plugging effect.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention and not for limiting it, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that: the technical scheme of the invention can be modified or replaced by the same, and the modified technical scheme cannot deviate from the spirit and scope of the technical scheme of the invention.
Claims (7)
1. The utility model provides an oil field fracturing high temperature resistant degradable temporary plugging agent which characterized in that: the composite material is prepared from the following raw materials in parts by weight: 70-80 parts of polyglycolide, 20-30 parts of carbon dioxide copolymer, 5-15 parts of poly (butylene adipate/terephthalate), 10-20 parts of starch, 1-4 parts of plasticizer, 3-8 parts of compatilizer, 1-10 parts of lubricant, 1-3 parts of heat stabilizer and 0.5-4 parts of nucleating agent.
2. The oilfield fracturing high-temperature-resistant degradable temporary plugging agent according to claim 1, wherein the temporary plugging agent is characterized by: the starch is corn starch, and the plasticizer is one or more of phthalate, sebacic acid ester, epoxidized soybean oil and epoxidized acetyl linolenate methyl ester.
3. The oilfield fracturing high-temperature-resistant degradable temporary plugging agent according to claim 1, wherein the temporary plugging agent is characterized by: the compatilizer is one or more of polycarbonate, polysiloxane, organic silicon resin, ethylene-vinyl acetate copolymer and ethylene-propylene-diene monomer copolymer.
4. The oilfield fracturing high-temperature-resistant degradable temporary plugging agent according to claim 1, wherein the temporary plugging agent is characterized by: the nucleating agent is one or more of dibenzylidene sorbitol sodium succinate, sodium glutarate and sodium caproate.
5. The oilfield fracturing high-temperature-resistant degradable temporary plugging agent according to claim 1, wherein the temporary plugging agent is characterized by: the lubricant is one of stearic acid amide, butyl stearate and glycerol trihydroxystearate.
6. The oilfield fracturing high-temperature-resistant degradable temporary plugging agent according to claim 1, wherein the temporary plugging agent is characterized by: the heat stabilizer is a mixture of lead stearate and epoxy fatty acid ester.
7. The method for preparing the oilfield fracturing high-temperature-resistant degradable temporary plugging agent according to any one of claims 1 to 6, which is characterized by comprising the following steps: the method comprises the following steps:
step 1: weighing raw materials of each component according to parts by weight, drying the weighed polyglycolide, carbon dioxide copolymer and poly (butylene terephthalate) at 100-130 ℃ respectively, and uniformly mixing to obtain a mixture;
step 2: adding the mixture obtained in the step 1 into a mixer, then adding starch and a nucleating agent, mixing uniformly, then sequentially adding a compatilizer, a plasticizer, a heat stabilizer and a lubricant, and fully and uniformly mixing to obtain a premix;
step 3: granulating the prepared premix by a double-screw extruder to obtain the degradable temporary plugging agent.
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