CN117285682A - Degradable adjustable temporary plugging agent and preparation method thereof - Google Patents
Degradable adjustable temporary plugging agent and preparation method thereof Download PDFInfo
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- CN117285682A CN117285682A CN202210687835.3A CN202210687835A CN117285682A CN 117285682 A CN117285682 A CN 117285682A CN 202210687835 A CN202210687835 A CN 202210687835A CN 117285682 A CN117285682 A CN 117285682A
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- temporary plugging
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- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- JVTAAEKCZFNVCJ-REOHCLBHSA-N L-lactic acid Chemical compound C[C@H](O)C(O)=O JVTAAEKCZFNVCJ-REOHCLBHSA-N 0.000 claims abstract description 86
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 67
- 239000000178 monomer Substances 0.000 claims abstract description 31
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 claims abstract description 26
- FWPIDFUJEMBDLS-UHFFFAOYSA-L tin(II) chloride dihydrate Chemical compound O.O.Cl[Sn]Cl FWPIDFUJEMBDLS-UHFFFAOYSA-L 0.000 claims abstract description 20
- 229920001577 copolymer Polymers 0.000 claims abstract description 14
- 229920000642 polymer Polymers 0.000 claims abstract description 14
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000003054 catalyst Substances 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 10
- 239000002131 composite material Substances 0.000 claims abstract description 10
- 238000006482 condensation reaction Methods 0.000 claims abstract description 10
- 239000007822 coupling agent Substances 0.000 claims abstract description 10
- 230000018044 dehydration Effects 0.000 claims abstract description 10
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 10
- 229910010272 inorganic material Inorganic materials 0.000 claims abstract description 10
- 239000011147 inorganic material Substances 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 10
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000002981 blocking agent Substances 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 150000001408 amides Chemical class 0.000 claims description 6
- 229910001430 chromium ion Inorganic materials 0.000 claims description 6
- 238000004090 dissolution Methods 0.000 claims description 6
- 230000002209 hydrophobic effect Effects 0.000 claims description 6
- 230000035484 reaction time Effects 0.000 claims description 6
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 5
- 239000005011 phenolic resin Substances 0.000 claims description 5
- 229920001568 phenolic resin Polymers 0.000 claims description 5
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical group CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 claims description 4
- AVWKSSYTZYDQFG-UHFFFAOYSA-M dimethyl-octadecyl-prop-2-enylazanium;chloride Chemical group [Cl-].CCCCCCCCCCCCCCCCCC[N+](C)(C)CC=C AVWKSSYTZYDQFG-UHFFFAOYSA-M 0.000 claims description 4
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 claims description 4
- FJDAAUABGSPSKH-UHFFFAOYSA-N s-(4-tert-butyl-1,3-benzothiazol-2-yl)thiohydroxylamine Chemical group CC(C)(C)C1=CC=CC2=C1N=C(SN)S2 FJDAAUABGSPSKH-UHFFFAOYSA-N 0.000 claims description 3
- 239000004094 surface-active agent Substances 0.000 claims description 3
- 239000000725 suspension Substances 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims 1
- 230000008018 melting Effects 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 4
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- 238000003786 synthesis reaction Methods 0.000 abstract description 3
- 239000003208 petroleum Substances 0.000 abstract description 2
- 238000005457 optimization Methods 0.000 description 9
- 230000035699 permeability Effects 0.000 description 9
- 230000015556 catabolic process Effects 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- DIFCZTZSUFXWEJ-UHFFFAOYSA-N s-(4-butyl-1,3-benzothiazol-2-yl)thiohydroxylamine Chemical group CCCCC1=CC=CC2=C1N=C(SN)S2 DIFCZTZSUFXWEJ-UHFFFAOYSA-N 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000003381 solubilizing effect Effects 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/006—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polymers provided for in C08G18/00
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
-
- 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
-
- 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
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/5086—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
Abstract
The invention relates to the technical field of petroleum exploitation, in particular to an easily degradable adjustable temporary plugging agent and a preparation method thereof, which are carried out according to the following steps: firstly, under the high-temperature environment condition, mixing L-lactic acid and glycolic acid with required amount as raw materials, stannous chloride dihydrate and paratoluenesulfonic acid as a composite catalyst and dihydric alcohol as a blocking agent, and performing dehydration condensation reaction to obtain a lactic acid-glycolic acid copolymer; secondly, adding 2, 4-toluene diisocyanate with required amount and nano inorganic materials into the lactic acid-glycolic acid copolymer to perform melt chain extension reaction to obtain a polymer with large molecular weight; and thirdly, adding a required amount of functional monomer and a coupling agent into the large molecular weight polymer to carry out polymerization reaction under the low-temperature environment condition to obtain the degradable adjustable temporary plugging agent. The invention obtains the degradable adjustable temporary plugging agent by the synthesis process at different temperatures, has the characteristics of high performance, low cost and lower biotoxicity, and is easy to regulate and degrade.
Description
Technical Field
The invention relates to the technical field of petroleum exploitation, in particular to an easily degradable adjustable temporary plugging agent and a preparation method thereof.
Background
The temporary plugging agent is a substance which can reduce the permeability of a reservoir or plug a high permeable layer in a short time, can be mixed with water-soluble substances and then injected into the reservoir together, gradually forms a compact and light temporary plugging zone of an oil layer under the action of pressure difference, and can be automatically plugged or manually plugged after a period of time.
The temporary plugging agents adopted by the domestic oilfield fracturing at present mainly comprise an oil-soluble temporary plugging agent and a water-soluble temporary plugging agent. The oil-soluble temporary plugging agent has strong bearing capacity and wide applicable temperature range, but can only be applied to fracturing construction of oil wells due to special requirements on solubility. The water-soluble temporary plugging agent has wide application range, less damage to stratum, high production cost, poor bearing capacity and difficult control of a gel breaking process.
Disclosure of Invention
The invention provides an easily degradable adjustable temporary plugging agent and a preparation method thereof, overcomes the defects of the prior art, and can effectively solve the problems of insufficient plugging strength, poor temperature stability, poor low-temperature solubility, more residues after dissolution, large damage to a reservoir and high cost of the temporary plugging agent.
One of the technical schemes of the invention is realized by the following measures: the preparation method of the degradable adjustable temporary plugging agent comprises the following steps: firstly, under the high-temperature environment condition, mixing L-lactic acid and glycolic acid with required amount as raw materials, stannous chloride dihydrate and paratoluenesulfonic acid as a composite catalyst and dihydric alcohol as a blocking agent, and performing dehydration condensation reaction to obtain a lactic acid-glycolic acid copolymer; secondly, adding 2, 4-toluene diisocyanate with required amount and nano inorganic materials into the lactic acid-glycolic acid copolymer under the medium temperature environment condition for carrying out melt chain extension reaction to obtain a polymer with large molecular weight; and thirdly, adding a required amount of functional monomer and a coupling agent into the large molecular weight polymer to carry out polymerization reaction under the low-temperature environment condition to obtain the degradable adjustable temporary plugging agent.
The following are further optimizations and/or improvements to one of the above-described inventive solutions:
in the first step, the molar ratio of the L-lactic acid to the glycolic acid is 45 to 75:15 to 45.
In the first step, the added mass of the composite catalyst accounts for 0.5 percent of the mass of the L-lactic acid, the added mass of the dihydric alcohol accounts for 0.4 percent of the mass of the L-lactic acid, and the mass ratio of stannous chloride dihydrate to p-toluenesulfonic acid is 1:1.
In the first step, the temperature of the high-temperature environment condition is 170 ℃, the pressure is 30Pa to 70Pa, and the dehydration condensation reaction time is 9h to 11h.
In the second step, the nano inorganic material is one of trivalent chromium ions and a surfactant, wherein the added mass of the 2, 4-toluene diisocyanate accounts for 40% of the mass of the L-lactic acid, and the added mass of the nano inorganic material accounts for 0.5% of the mass of the L-lactic acid.
In the second step, the temperature in the melt chain extension reaction in the medium-temperature environment condition is 160 ℃, and the reaction time is 1 to 2 hours.
In the third step, the functional monomer is one of a tackifying amide monomer, a hydrophobic monomer, a dissolution assisting monomer and a suspension monomer, and the added mass of the functional monomer accounts for 4% of the mass of the L-lactic acid, and the added mass of the coupling agent accounts for 0.97% of the mass of the L-lactic acid.
The tackifying amide monomer is butyl acrylate, the hydrophobic monomer is octadecyl dimethyl allyl ammonium chloride, the dissolution assisting monomer is tert-butyl-2-benzothiazole sulfenamide, and the coupling agent is one of phenolic resin and urotropine.
In the third step, the polymerization temperature in the low-temperature environment is 60 ℃.
The second technical scheme of the invention is realized by the following measures: the degradable adjustable temporary plugging agent obtained by the preparation method.
The invention has the following beneficial effects:
(1) The degradable adjustable temporary plugging agent has the advantages of effectively improving the fracturing efficiency through the characteristics of high performance, low cost, easy regulation and control and degradation and adjustable property, so that the oil well yield is improved; meanwhile, the biological toxicity is lower, the biological degradation is easy, the environmental adaptability is good, and the environmental protection requirement in the production and construction process is met.
(2) The degradable adjustable temporary plugging agent can realize the improvement of various performances such as pressure bearing, temperature resistance, degradation rate and the like of the temporary plugging agent according to the performance requirements of the temporary plugging agent at different temperatures.
Drawings
FIG. 1 is a graph showing the water permeability of BJ-APGEL type temporary plugging agent.
FIG. 2 is a graph of water permeability of the degradable adjustable temporary plugging agent of the invention.
FIG. 3 is a graph of the breakthrough pressure of BJ-APGEL type temporary plugging agent.
Fig. 4 is a graph of the breakthrough pressure of the degradable adjustable temporary plugging agent of the invention.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments can be determined according to the technical scheme and practical situations of the present invention. The various chemical reagents and chemicals mentioned in the present invention are all commonly known in the art unless specifically stated otherwise.
The invention is further described below with reference to examples:
example 1: the preparation method of the degradable adjustable temporary plugging agent comprises the following steps: firstly, under the high-temperature environment condition, mixing L-lactic acid and glycolic acid with required amount as raw materials, stannous chloride dihydrate and paratoluenesulfonic acid as a composite catalyst and dihydric alcohol as a blocking agent, and performing dehydration condensation reaction to obtain a lactic acid-glycolic acid copolymer; secondly, adding 2, 4-toluene diisocyanate with required amount and nano inorganic materials into the lactic acid-glycolic acid copolymer under the medium temperature environment condition for carrying out melt chain extension reaction to obtain a polymer with large molecular weight; and thirdly, adding a required amount of functional monomer and a coupling agent into the large molecular weight polymer to carry out polymerization reaction under the low-temperature environment condition to obtain the degradable adjustable temporary plugging agent.
Example 2: as an optimization of the above examples, in the first step, the molar ratio of L-lactic acid to glycolic acid was 45 to 75:15 to 45.
Example 3: as the optimization of the above examples, in the first step, the addition mass of the composite catalyst was 0.5% of the mass of L-lactic acid, the addition mass of the dihydric alcohol was 0.4% of the mass of L-lactic acid, and the mass ratio of stannous chloride dihydrate to p-toluenesulfonic acid was 1:1.
Example 4: as an optimization of the above examples, in the first step, the temperature of the high temperature environment condition was 170℃and the pressure was 30Pa to 70Pa, and the dehydration condensation reaction time was 9 hours to 11 hours.
Example 5: as an optimization of the above embodiment, in the second step, the nano inorganic material is one of trivalent chromium ion and surfactant, wherein the added mass of 2, 4-toluene diisocyanate accounts for 40% of the mass of L-lactic acid, and the added mass of the nano inorganic material accounts for 0.5% of the mass of L-lactic acid.
Example 6: as an optimization of the above examples, in the second step, the temperature in the melt chain extension reaction in the medium temperature environmental condition is 160 ℃ and the reaction time is 1 to 2 hours.
Example 7: as an optimization of the above embodiment, in the third step, the functional monomer is one of a tackifying amide monomer, a hydrophobic monomer, a solubilizing monomer and a suspending monomer, and the added mass of the functional monomer is 4% of the mass of the L-lactic acid, and the added mass of the coupling agent is 0.97% of the mass of the L-lactic acid.
Example 8: as optimization of the embodiment, the tackifying amide monomer is butyl acrylate, the hydrophobic monomer is octadecyl dimethyl allyl ammonium chloride, the dissolution assisting monomer is tert-butyl-2-benzothiazole sulfenamide, and the coupling agent is one of phenolic resin and urotropine.
Example 9: as an optimization of the above examples, in the third step, the polymerization temperature in the low temperature environment was 60 ℃.
Example 10: the degradable adjustable temporary plugging agent obtained by the preparation method is easy to degrade.
Example 11: the degradable adjustable temporary plugging agent is prepared according to the following steps: firstly, mixing L-lactic acid and glycolic acid with required amount as raw materials, stannous chloride dihydrate and paratoluenesulfonic acid as a composite catalyst and dihydric alcohol as a blocking agent at the temperature of 170 ℃ and the pressure of 30Pa to 70Pa, and performing dehydration condensation reaction for 10 hours to obtain a lactic acid-glycolic acid copolymer, wherein the molar ratio of the L-lactic acid to the glycolic acid is 75:15; secondly, adding 2, 4-toluene diisocyanate accounting for 40 percent of the mass of L-lactic acid and trivalent chromium ions accounting for 0.5 percent of the mass of L-lactic acid into a lactic acid-glycolic acid copolymer at 160 ℃ for carrying out melt chain extension reaction for 1h to obtain a polymer with large molecular weight; thirdly, adding butyl acrylate with the mass of 4% of L-lactic acid and phenolic resin with the mass of 0.97% of L-lactic acid into the large molecular weight polymer at the temperature of 60 ℃ for polymerization reaction to obtain the degradable adjustable temporary plugging agent.
Example 12: the degradable adjustable temporary plugging agent is prepared according to the following steps: firstly, mixing L-lactic acid and glycolic acid with required amount as raw materials, stannous chloride dihydrate and paratoluenesulfonic acid as a composite catalyst and dihydric alcohol as a blocking agent at the temperature of 170 ℃ and the pressure of 30Pa to 70Pa, and performing dehydration condensation reaction for 10 hours to obtain a lactic acid-glycolic acid copolymer, wherein the molar ratio of the L-lactic acid to the glycolic acid is 55:35; secondly, adding 2, 4-toluene diisocyanate accounting for 40 percent of the mass of L-lactic acid and trivalent chromium ions accounting for 0.5 percent of the mass of L-lactic acid into a lactic acid-glycolic acid copolymer at 160 ℃ for carrying out melt chain extension reaction for 1h to obtain a polymer with large molecular weight; thirdly, under the condition that the temperature is 60 ℃, octadecyl dimethyl allyl ammonium chloride with the mass of 4 percent of L-lactic acid and urotropine with the mass of 0.97 percent of L-lactic acid are added into the large molecular weight polymer for polymerization reaction, and the degradable adjustable temporary plugging agent is obtained.
Example 13: the degradable adjustable temporary plugging agent is prepared according to the following steps: firstly, mixing L-lactic acid and glycolic acid with required amount as raw materials, stannous chloride dihydrate and paratoluenesulfonic acid as a composite catalyst and dihydric alcohol as a blocking agent at the temperature of 170 ℃ and the pressure of 30Pa to 70Pa, and performing dehydration condensation reaction for 10 hours to obtain a lactic acid-glycolic acid copolymer, wherein the molar ratio of the L-lactic acid to the glycolic acid is 45:45; secondly, adding 2, 4-toluene diisocyanate accounting for 40 percent of the mass of L-lactic acid and trivalent chromium ions accounting for 0.5 percent of the mass of L-lactic acid into a lactic acid-glycolic acid copolymer at 160 ℃ for carrying out melt chain extension reaction for 1h to obtain a polymer with large molecular weight; thirdly, adding 4% of tertiary butyl-2-benzothiazole sulfenamide by mass of L-lactic acid and 0.97% of phenolic resin by mass of L-lactic acid into the large molecular weight polymer at the temperature of 60 ℃ for polymerization reaction to obtain the degradable adjustable temporary plugging agent.
The performance evaluation experiment was performed on the degradable adjustable temporary plugging agent obtained according to the embodiment 13 of the invention:
the performance evaluation experiment is set up and is compared with other synthetic temporary plugging agents (BJ-APGEL type temporary plugging agents), the breakthrough pressure of the BJ-APGEL type temporary plugging agents and the easily degradable adjustable temporary plugging agents is tested through the core displacement experiment, and the BJ-APGEL type temporary plugging agents (core 1) and the easily degradable adjustable temporary plugging agents (core 2) are respectively injected into two cores with the same parameters. The BJ-APGEL temporary plugging agent is a synthetic temporary plugging agent sold in the market of the existing Beijing epper polymerization technology Co.
Through experimental determination, basic parameters of the obtained core are shown in table 1 about 0.4D to 0.8D, water permeability measurement curves of the BJ-APGEL type temporary plugging agent (core 1) and the easily degradable adjustable temporary plugging agent (core 2) are shown in fig. 1 and 2, and breakthrough pressure curves of the BJ-APGEL type temporary plugging agent (core 1) and the easily degradable adjustable temporary plugging agent (core 2) are shown in fig. 3 and 4.
The breakthrough pressure of the novel temporary plugging agent is tested by using a step-by-step pressurizing method, and as can be seen from fig. 1 and 2, during the period, due to the plugging effect of the temporary plugging agent, no fluid flows out of the outlet end of the sand filling pipe filled with the BJ-APGEL temporary plugging agent and the easily degradable adjustable temporary plugging agent, and after the temporary plugging agent is broken through, the displacement pressure is reduced to different degrees, and the permeability begins to recover slowly.
As can be seen from the permeability (SY/T-6385-2016) graphs 1 and 2 and the breakthrough pressure (SY/T-5748-2020) graphs 3 and 4 of the two groups of temporary plugging systems, when the BJ-APGEL type temporary plugging agent is selected as the temporary plugging system, the pressure and permeability fluctuation are stable, so that the BJ-APGEL type temporary plugging agent has strong compression resistance, no broken flooding is formed on the temporary plugging agent gel after the pressure breakthrough, and other positions except the breakthrough part can continue to exist stably and are not easy to degrade; when the easily degradable adjustable temporary plugging agent is used as a temporary plugging system, the fluctuation range of pressure and permeability is more severe after pressure breakthrough, after finishing temperature series synthesis transformation, after water flooding breakthrough, the temporary plugging liquid system near the breakthrough position is influenced by the action of ambient temperature, partial degradation is started, and pressure and permeability continuously fluctuate.
In conclusion, the degradable adjustable temporary plugging agent is obtained through the synthesis process at different temperatures, has the characteristics of high performance, low cost and low biotoxicity, and is easy to regulate and degrade.
The technical characteristics form the embodiment of the invention, have stronger adaptability and implementation effect, and can increase or decrease unnecessary technical characteristics according to actual needs so as to meet the requirements of different situations.
Claims (10)
1. The preparation method of the degradable adjustable temporary plugging agent is characterized by comprising the following steps of: firstly, under the high-temperature environment condition, mixing L-lactic acid and glycolic acid with required amount as raw materials, stannous chloride dihydrate and paratoluenesulfonic acid as a composite catalyst and dihydric alcohol as a blocking agent, and performing dehydration condensation reaction to obtain a lactic acid-glycolic acid copolymer; secondly, adding 2, 4-toluene diisocyanate with required amount and nano inorganic materials into the lactic acid-glycolic acid copolymer under the medium temperature environment condition for carrying out melt chain extension reaction to obtain a polymer with large molecular weight; and thirdly, adding a required amount of functional monomer and a coupling agent into the large molecular weight polymer to carry out polymerization reaction under the low-temperature environment condition to obtain the degradable adjustable temporary plugging agent.
2. The method for preparing the degradable adjustable temporary plugging agent according to claim 1, wherein in the first step, the molar ratio of the L-lactic acid to the glycolic acid is 45 to 75:15 to 45.
3. The preparation method of the degradable adjustable temporary plugging agent according to claim 1 or 2, wherein in the first step, the addition mass of the composite catalyst accounts for 0.5% of the mass of the L-lactic acid, the addition mass of the dihydric alcohol accounts for 0.4% of the mass of the L-lactic acid, and the mass ratio of stannous chloride dihydrate to p-toluenesulfonic acid is 1:1.
4. The method for preparing the degradable adjustable temporary plugging agent according to claim 1, 2 or 3, wherein in the first step, the temperature of the high-temperature environment condition is 170 ℃, the pressure is 30Pa to 70Pa, and the dehydration condensation reaction time is 9h to 11h.
5. The preparation method of the degradable adjustable temporary plugging agent according to claim 1, 2, 3 or 4, wherein in the second step, the nano inorganic material is one of trivalent chromium ions and a surfactant, wherein the added mass of the 2, 4-toluene diisocyanate accounts for 40% of the mass of the L-lactic acid, and the added mass of the nano inorganic material accounts for 0.5% of the mass of the L-lactic acid.
6. The method for preparing the degradable adjustable temporary plugging agent according to claim 1 or 2 or 3 or 4 or 5, wherein in the second step, the temperature in the melting chain extension reaction in the medium-temperature environment condition is 160 ℃, and the reaction time is 1 to 2 hours.
7. The preparation method of the degradable adjustable temporary plugging agent according to any one of claims 1 to 6, wherein in the third step, the functional monomer is one of a tackifying amide monomer, a hydrophobic monomer, a dissolution assisting monomer and a suspension monomer, and the addition mass of the functional monomer accounts for 4% of the mass of the L-lactic acid, and the addition mass of the coupling agent accounts for 0.97% of the mass of the L-lactic acid.
8. The method for preparing the degradable adjustable temporary plugging agent according to claim 7, wherein the tackifying amide monomer is butyl acrylate, the hydrophobic monomer is octadecyl dimethyl allyl ammonium chloride, the dissolution assisting monomer is tert-butyl-2-benzothiazole sulfenamide, and the coupling agent is one of phenolic resin and urotropine.
9. The method for preparing a readily degradable adjustable temporary plugging agent according to any one of claims 1 to 8, wherein in the third step, the polymerization temperature in a low temperature environment is 60 ℃.
10. An easily degradable adjustable temporary plugging agent obtained by the preparation method according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210687835.3A CN117285682A (en) | 2022-06-17 | 2022-06-17 | Degradable adjustable temporary plugging agent and preparation method thereof |
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| CN202210687835.3A CN117285682A (en) | 2022-06-17 | 2022-06-17 | Degradable adjustable temporary plugging agent and preparation method thereof |
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| CN117285682A true CN117285682A (en) | 2023-12-26 |
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| CN202210687835.3A Pending CN117285682A (en) | 2022-06-17 | 2022-06-17 | Degradable adjustable temporary plugging agent and preparation method thereof |
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- 2022-06-17 CN CN202210687835.3A patent/CN117285682A/en active Pending
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