CN111484578A - Water-soluble AA-AM-NVP-NGD quadripolymer temporary plugging agent for fracturing and synthesis method thereof - Google Patents
Water-soluble AA-AM-NVP-NGD quadripolymer temporary plugging agent for fracturing and synthesis method thereof Download PDFInfo
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- 238000001308 synthesis method Methods 0.000 title abstract description 5
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 77
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- YDKNBNOOCSNPNS-UHFFFAOYSA-N methyl 1,3-benzoxazole-2-carboxylate Chemical compound C1=CC=C2OC(C(=O)OC)=NC2=C1 YDKNBNOOCSNPNS-UHFFFAOYSA-N 0.000 claims abstract description 25
- WHNWPMSKXPGLAX-UHFFFAOYSA-N N-Vinyl-2-pyrrolidone Chemical compound C=CN1CCCC1=O WHNWPMSKXPGLAX-UHFFFAOYSA-N 0.000 claims abstract description 24
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims abstract description 19
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 19
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 230000002194 synthesizing effect Effects 0.000 claims abstract description 6
- 239000000178 monomer Substances 0.000 claims abstract description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium peroxydisulfate Substances [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000008367 deionised water Substances 0.000 claims description 12
- 229910021641 deionized water Inorganic materials 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 8
- 239000007864 aqueous solution Substances 0.000 claims description 8
- 239000007795 chemical reaction product Substances 0.000 claims description 7
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 4
- SATQNYRZLIROHO-UHFFFAOYSA-N [NH4+].[Na].OS([O-])=O Chemical compound [NH4+].[Na].OS([O-])=O SATQNYRZLIROHO-UHFFFAOYSA-N 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 239000003999 initiator Substances 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 4
- 230000001502 supplementing effect Effects 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 3
- 238000006116 polymerization reaction Methods 0.000 claims description 3
- 239000000047 product Substances 0.000 claims description 3
- 229920006029 tetra-polymer Polymers 0.000 claims description 3
- 230000009471 action Effects 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 6
- 239000003431 cross linking reagent Substances 0.000 abstract description 5
- 239000011203 carbon fibre reinforced carbon Substances 0.000 abstract description 4
- 230000007246 mechanism Effects 0.000 abstract description 4
- -1 neopentyl glycol diacrylate ester Chemical class 0.000 abstract description 4
- 238000010521 absorption reaction Methods 0.000 description 11
- 230000035699 permeability Effects 0.000 description 6
- 239000003153 chemical reaction reagent Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- 239000003208 petroleum Substances 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000007800 oxidant agent Substances 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 238000010189 synthetic method Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 238000002329 infrared spectrum Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000009096 changqing Substances 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007863 gel particle Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 150000003140 primary amides Chemical class 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000009671 shengli Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/56—Acrylamide; Methacrylamide
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- 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
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Abstract
The invention relates to the technical field of oilfield chemistry, and discloses a water-soluble AA-AM-NVP-NGD quadripolymer temporary plugging agent for fracturing and a synthesis method thereof, wherein the temporary plugging agent is a quadripolymer mainly composed of 30-40% of acrylic acid, 59.4-68.0% of acrylamide, 0.5-1.5% of N-vinyl pyrrolidone and 0.1-0.5% of neopentyl glycol diacrylate in percentage by mass of raw material monomers. According to the invention, N-vinyl pyrrolidone with a five-membered ring structure is introduced onto a molecular chain of the temporary plugging agent, so that the rigidity and stability of the molecular chain of the temporary plugging agent can be improved, and the temporary plugging strength of the temporary plugging agent is improved; the neopentyl glycol diacrylate ester with two carbon-carbon double bonds is used for synthesizing the temporary plugging agent, and plays a role of a cross-linking agent, so that the temporary plugging agent becomes a water-swelling body after absorbing water, and can form plugging on cracks; the temporary plugging agent has a plugging removal mechanism different from that of the existing water-soluble temporary plugging agent, and the plugging removal process does not need to add a plugging removal agent, only needs to realize complete plugging removal under the action of temperature and water, and has good plugging removal performance.
Description
Technical Field
The invention relates to the technical field of oilfield chemistry, in particular to a water-soluble AA-AM-NVP-NGD quadripolymer temporary plugging agent for fracturing and a synthetic method thereof.
Background
In recent years, low permeability reservoir efficient development techniques have received much attention. A large number of low permeability reservoirs are found in main oil fields such as Daqing oil field, Jilin oil field, Liaohe oil field, Shengli oil field, Changqing oil field and the like. In the recently explored virgin petroleum geological reserves, the low permeability reserves with permeability less than 50 millidarcy account for over 58%; in the ascertained petroleum geological reserves, the petroleum geological reserves of the low-permeability reservoirs account for up to 60-70%. Therefore, the development of low-permeability oil reservoirs is of great significance to guarantee energy safety in China.
The low-permeability oil reservoir has poor physical properties, low porosity, low permeability and low natural yield. To improve the development of low permeability reservoirs, the wells typically need to be fractured before being put into production. Because of the influence of factors such as reservoir physical properties, development processes and the like, artificial fractures formed by conventional fracturing are low in complexity and conductivity, the yield is still low after the fracturing operation of part of oil wells, the stable production period is short, and the development benefit is not ideal. The adoption of the temporary plugging agent to construct the complex fracture network is an effective means for greatly improving the flow conductivity of the artificial fracture, improving the yield of a single well and prolonging the stable production period. However, the existing temporary plugging agent cannot well meet the requirement of low-permeability reservoir for constructing complex gap nets. The main two aspects are as follows:
(1) The temporary plugging strength is low. The oil-soluble temporary plugging agent, the acid-soluble temporary plugging agent and the alkali-soluble temporary plugging agent which are commonly used at present comprise petroleum resin, calcium carbonate and alkali-soluble organic matters which are soft, and the temporary plugging strength of the prepared temporary plugging agent is low.
(2) The unblocking performance is poor. The water-soluble temporary plugging agent mainly takes polyacrylamide as a raw material, forms gel under the action of a cross-linking agent, and forms plugging by utilizing gel particles. At present, the temporary plugging strength of the water-soluble temporary plugging agent is highest and can reach 5 MPa. However, the water-soluble temporary plugging agent has poor plugging removal performance, usually needs an additional plugging removal agent (strong oxidant), and often has an area where the plugging removal agent cannot act, so that the plugging removal is incomplete, and the reservoir stratum is damaged for a long time.
Therefore, in order to improve the fracturing development effect of low-permeability reservoirs, the development of a temporary plugging agent for fracturing with more excellent performance is urgently needed.
Disclosure of Invention
Based on the problems, the invention provides a water-soluble AA-AM-NVP-NGD quadripolymer temporary plugging agent for fracturing and a synthesis method thereof, wherein N-vinyl pyrrolidone with a five-membered ring structure is introduced into a molecular chain of the temporary plugging agent, so that the rigidity and the stability of the molecular chain of the temporary plugging agent can be improved, and the temporary plugging strength of the temporary plugging agent is improved; the neopentyl glycol diacrylate ester with two carbon-carbon double bonds is used for synthesizing the temporary plugging agent, and plays a role of a cross-linking agent, so that the temporary plugging agent becomes a water-swelling body after absorbing water, and can form plugging on cracks; the temporary plugging agent has a plugging removal mechanism different from that of the existing water-soluble temporary plugging agent, and the plugging removal process does not need to add a plugging removal agent (strong oxidant), only needs to realize complete plugging removal under the action of stratum temperature and water, and has good plugging removal performance.
In order to solve the technical problems, the invention provides a water-soluble AA-AM-NVP-NGD quadripolymer temporary plugging agent for fracturing, which is a quadripolymer mainly composed of Acrylic Acid (AA), Acrylamide (AM), N-vinyl pyrrolidone (NVP) and Neopentyl Glycol Diacrylate (NGD); the structural formula is as follows:
Wherein x, y, z, a, b, l, m and n are polymerization degrees.
Further, the temporary plugging agent comprises the following raw materials in percentage by mass: 30 to 40 percent of acrylic acid, 59.4 to 68.0 percent of acrylamide, 0.5 to 1.5 percent of N-vinyl pyrrolidone and 0.1 to 0.5 percent of neopentyl glycol diacrylate.
In order to solve the technical problems, the invention also provides a synthetic method of the water-soluble AA-AM-NVP-NGD quadripolymer temporary plugging agent for fracturing, which comprises the following steps:
S1, adding 30-40 parts of acrylic acid, 59.4-68.0 parts of acrylamide, 0.5-1.5 parts of N-vinyl pyrrolidone and 200-250 parts of deionized water into a reaction kettle;
S2, adding a sodium hydroxide solution into the mixed solution obtained in the step S1 to adjust the pH value to 7.0-7.5, adding 0.5-1.5 parts of neopentyl glycol diacrylate, supplementing a certain amount of deionized water to prepare an aqueous solution with the total mass concentration of the monomers being 25%, and introducing nitrogen into the solution to remove oxygen;
S3, placing the reaction kettle into a constant-temperature water bath kettle, adding a sodium bisulfite-ammonium persulfate initiator after the temperature of the aqueous solution reaches 45 ℃, wherein the molar ratio of sodium bisulfite to ammonium persulfate is 1: 1, the adding amount is 0.1 to 0.5 percent of the total mass of the acrylic acid, the acrylamide, the N-vinyl pyrrolidone and the neopentyl glycol diacrylate; the reaction system reacts for 4 hours at the temperature of 45 ℃, and the reaction product is AA-AM-NVP-NGD quadripolymer;
S4, drying and crushing the reaction product obtained in the step S3 to obtain the finished product of the temporary plugging agent.
Compared with the prior art, the invention has the beneficial effects that:
(1) The N-vinyl pyrrolidone with a five-membered ring structure is introduced onto the molecular chain of the temporary plugging agent, so that the rigidity and stability of the molecular chain of the temporary plugging agent can be improved, and the temporary plugging strength of the temporary plugging agent is improved;
(2) The neopentyl glycol diacrylate ester with two carbon-carbon double bonds is used for synthesizing the temporary plugging agent, and plays a role of a cross-linking agent, so that the temporary plugging agent becomes a water-swelling body after absorbing water, and can form plugging on cracks;
(3) Because the neopentyl glycol diacrylate has two ester bonds, the neopentyl glycol diacrylate can be hydrolyzed under the action of formation temperature and water, so that the neopentyl glycol diacrylate loses the crosslinking effect, becomes a water swelling body after absorbing water, becomes a polymer with low molecular weight, can be dissolved in water to become a polymer solution, flows out of a crack and loses the plugging effect on the crack, and the blockage removal is realized;
(4) The temporary plugging agent has a plugging removal mechanism different from that of the existing water-soluble temporary plugging agent, and the plugging removal process does not need to add a plugging removal agent (strong oxidant), only needs to realize complete plugging removal under the action of temperature and water, and has good plugging removal performance.
Drawings
FIG. 1 is an infrared spectrum of the water-soluble AA-AM-NVP-NGD tetrapolymer temporary plugging agent synthesized in example 2.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example (b):
A water-soluble AA-AM-NVP-NGD quadripolymer temporary plugging agent for fracturing is a quadripolymer mainly composed of Acrylic Acid (AA), Acrylamide (AM), N-vinyl pyrrolidone (NVP) and Neopentyl Glycol Diacrylate (NGD); the structural formula is as follows:
Wherein x, y, z, a, b, l, m and n are polymerization degrees.
The temporary plugging agent comprises the following raw materials in percentage by mass: 30 to 40 percent of acrylic acid, 59.4 to 68.0 percent of acrylamide, 0.5 to 1.5 percent of N-vinyl pyrrolidone and 0.1 to 0.5 percent of neopentyl glycol diacrylate.
The synthesis method of the water-soluble AA-AM-NVP-NGD quadripolymer temporary plugging agent for fracturing in the embodiment comprises the following steps:
S1, adding 30-40 parts of acrylic acid, 59.4-68.0 parts of acrylamide, 0.5-1.5 parts of N-vinyl pyrrolidone and 200-250 parts of deionized water into a reaction kettle;
S2, adding a sodium hydroxide solution into the mixed solution obtained in the step S1 to adjust the pH value to 7.0-7.5, adding 0.5-1.5 parts of neopentyl glycol diacrylate, supplementing a certain amount of deionized water to prepare an aqueous solution with the total mass concentration of the monomers being 25%, and introducing nitrogen into the solution to remove oxygen;
S3, placing the reaction kettle into a constant-temperature water bath kettle, adding a sodium bisulfite-ammonium persulfate initiator after the temperature of the aqueous solution reaches 45 ℃, wherein the molar ratio of sodium bisulfite to ammonium persulfate is 1: 1, the adding amount is 0.1 to 0.5 percent of the total mass of the acrylic acid, the acrylamide, the N-vinyl pyrrolidone and the neopentyl glycol diacrylate; the reaction system reacts for 4 hours at the temperature of 45 ℃, and the reaction product is AA-AM-NVP-NGD quadripolymer;
S4, drying and crushing the reaction product obtained in the step S3 to obtain the finished product of the temporary plugging agent.
In this embodiment, the N-vinyl pyrrolidone having a five-membered ring structure is introduced into the molecular chain of the temporary plugging agent, so that the rigidity and stability of the molecular chain of the temporary plugging agent can be improved, and the temporary plugging strength of the temporary plugging agent can be improved; the neopentyl glycol diacrylate ester with two carbon-carbon double bonds is used for synthesizing the temporary plugging agent, and plays a role of a cross-linking agent, so that the temporary plugging agent becomes a water-swelling body after absorbing water, and can form plugging on cracks; because the neopentyl glycol diacrylate has two ester bonds, the neopentyl glycol diacrylate can be hydrolyzed under the action of formation temperature and water, so that the neopentyl glycol diacrylate loses the crosslinking effect, becomes a water swelling body after absorbing water, becomes a polymer with low molecular weight, can be dissolved in water to become a polymer solution, flows out of a crack and loses the plugging effect on the crack, and the blockage removal is realized; the temporary plugging agent has a plugging removal mechanism different from that of the existing water-soluble temporary plugging agent, does not need an additional strong oxidant-type plugging removal agent in the plugging removal process, only needs to realize complete plugging removal under the action of stratum temperature and water, and has good plugging removal performance.
Example 2
Synthetic method of water-soluble AA-AM-NVP-NGD quadripolymer temporary plugging agent for fracturing
Preparing materials: weighing the main raw materials according to the following table
| Name of raw materials | Code | Dosage (g) |
| Acrylic acid | AA | 35 |
| Acrylamide | AM | 63.8 |
| N-vinyl pyrrolidone | NVP | 1.0 |
| Neopentyl glycol diacrylate | NGD | 0.2 |
The specific operation flow is as follows: adding 220g of deionized water, 35g of acrylic acid, 63.8g of acrylamide and 1.0g of N-vinyl pyrrolidone into a 1000ml reaction kettle, adjusting the pH value to 7.0-7.5 by using a sodium hydroxide solution, adding 0.2g of neopentyl glycol diacrylate, supplementing a certain amount of deionized water to prepare an aqueous solution with the total mass concentration of monomers of 25%, and introducing nitrogen to remove oxygen; after the temperature of the aqueous solution reaches 45 ℃, adding 0.3g of sodium bisulfite-ammonium persulfate initiator (the molar ratio of the sodium bisulfite to the ammonium persulfate is 1: 1), and reacting for 4 hours at the temperature of 45 ℃; the reaction product is AA-AM-NVP-NGD quadripolymer, and the temporary plugging agent is prepared by drying and crushing.
Characterization of Water-soluble AA-AM-NVP-NGD tetrapolymer temporary plugging agent
The infrared spectrum of the water-soluble AA-AM-NVP-NGD quadripolymer temporary plugging agent synthesized by the embodiment is shown in FIG. 1. As can be seen from FIG. 1, 3408cm -1The strong absorption peak is attributed to the antisymmetric stretching vibration of NH; 2931cm -1The stronger absorption peak is attributed to the inverse of alkane CH Symmetric telescopic vibration; 1669cm -1The strong absorption peak is attributed to the stretching vibration of the C ═ O bond; at 1453cm -1The absorption peak at (A) is attributed to the characteristic absorption peak of NVP; 1402cm -1The strong absorption peak belongs to C-N stretching vibration in primary amide; 1325cm -1The stronger absorption peak belongs to C-O stretching vibration; 1189cm -1The strong absorption peak is attributed to the stretching vibration of the ester bond; 1110cm -1The absorption peak at (A) is attributed to NH 2The in-plane rocking vibration of (1); 1043cm -1The stronger absorption peak belongs to C-C stretching vibration; 682cm -1The absorption peak at (A) is attributed to NH 2Out-of-plane rocking vibration.
Determination of temporary plugging strength of water-soluble AA-AM-NVP-NGD quadripolymer temporary plugging agent
200g of the water-soluble AA-AM-NVP-NGD quadripolymer temporary plugging agent prepared by the method of the embodiment is uniformly mixed with 800g of ceramsite with the particle size of 60-80 meshes, and the ceramsite mixed with the temporary plugging agent is filled into a sand filling pipe (the length is 50cm, and the inner diameter is 2.5cm), and the filling pressure is 5 MPa; placing the sand filling pipe in deionized water at 50 ℃ to ensure that the temporary plugging agent in the sand filling pipe fully absorbs water and expands; and then injecting deionized water into the sand filling pipe at the temperature of 50 ℃ at the flow rate of 1ml/min by using a constant-speed constant-flow pump, recording the injection pressure, and obtaining that the highest injection pressure of the deionized water in the sand filling pipe is 15.7MPa through experiments, which shows that the temporary plugging agent has higher temporary plugging strength.
Determination of deblocking Performance of Water-soluble AA-AM-NVP-NGD quadripolymer temporary plugging agent
2g of the water-soluble AA-AM-NVP-NGD quadripolymer temporary plugging agent prepared by the method of the embodiment is added into a reagent bottle containing 98g of deionized water, the reagent bottle is sealed and then placed in a constant temperature cabinet with the temperature of 100 ℃, the reagent bottle is taken out after 10 hours, and a Brookfiltered DV-III viscometer (the shear rate is 7.34 s) -1) The viscosity of the solution in the reagent bottle is measured to be 1.6mPa.s at 25 ℃, and the observation that the solution in the reagent bottle is uniform and has no solid phase shows that the temporary plugging agent has better plugging removal performance.
The above is an embodiment of the present invention. The embodiments and specific parameters in the embodiments are only for the purpose of clearly illustrating the verification process of the invention and are not intended to limit the scope of the invention, which is defined by the claims, and all equivalent structural changes made by using the contents of the specification and the drawings of the present invention should be covered by the scope of the present invention.
Claims (3)
1. A water-soluble AA-AM-NVP-NGD quadripolymer temporary plugging agent for fracturing is characterized in that the temporary plugging agent is a quadripolymer mainly composed of Acrylic Acid (AA), Acrylamide (AM), N-vinyl pyrrolidone (NVP) and Neopentyl Glycol Diacrylate (NGD); the structural formula is as follows:
Wherein x, y, z, a, b, l, m and n are polymerization degrees.
2. The water-soluble AA-AM-NVP-NGD tetrapolymer temporary plugging agent according to claim 1, characterized in that: the temporary plugging agent comprises the following raw materials in percentage by mass: 30 to 40 percent of acrylic acid, 59.4 to 68.0 percent of acrylamide, 0.5 to 1.5 percent of N-vinyl pyrrolidone and 0.1 to 0.5 percent of neopentyl glycol diacrylate.
3. A method for synthesizing a water-soluble AA-AM-NVP-NGD quadripolymer temporary plugging agent for fracturing, which is used for synthesizing the water-soluble AA-AM-NVP-NGD quadripolymer temporary plugging agent in claim 2, and is characterized by comprising the following steps:
S1, adding 30-40 parts of acrylic acid, 59.4-68.0 parts of acrylamide, 0.5-1.5 parts of N-vinyl pyrrolidone and 200-250 parts of deionized water into a reaction kettle;
S2, adding a sodium hydroxide solution into the mixed solution obtained in the step S1 to adjust the pH value to 7.0-7.5, adding 0.5-1.5 parts of neopentyl glycol diacrylate, supplementing a certain amount of deionized water to prepare an aqueous solution with the total mass concentration of the monomers being 25%, and introducing nitrogen into the solution to remove oxygen;
S3, placing the reaction kettle into a constant-temperature water bath kettle, adding a sodium bisulfite-ammonium persulfate initiator after the temperature of the aqueous solution reaches 45 ℃, wherein the molar ratio of sodium bisulfite to ammonium persulfate is 1: 1, the adding amount is 0.1 to 0.5 percent of the total mass of the acrylic acid, the acrylamide, the N-vinyl pyrrolidone and the neopentyl glycol diacrylate; the reaction system reacts for 4 hours at the temperature of 45 ℃, and the reaction product is AA-AM-NVP-NGD quadripolymer;
S4, drying and crushing the reaction product obtained in the step S3 to obtain the finished product of the temporary plugging agent.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113249101A (en) * | 2021-05-20 | 2021-08-13 | 东南大学 | Preparation method of water-soluble composite temporary plugging agent for diversion fracturing |
| CN113929816A (en) * | 2021-11-24 | 2022-01-14 | 四川轻化工大学 | High-strength profile control agent and preparation method thereof |
| CN113956859A (en) * | 2021-10-25 | 2022-01-21 | 山东恒立重装新技术有限公司 | Temporary plugging ball and manufacturing method thereof |
| CN114774102A (en) * | 2022-06-21 | 2022-07-22 | 山东科兴化工有限责任公司 | Degradable rope knot type temporary plugging agent for fracturing and preparation method thereof |
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| CN116355600A (en) * | 2023-02-15 | 2023-06-30 | 西安博宏石油科技有限公司 | Temperature switch type temporary plugging agent and preparation method and application thereof |
| CN116716089A (en) * | 2023-06-09 | 2023-09-08 | 浙江神耀石化科技有限公司 | Composite water-soluble temporary plugging agent for oilfield steering fracturing construction |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113249101A (en) * | 2021-05-20 | 2021-08-13 | 东南大学 | Preparation method of water-soluble composite temporary plugging agent for diversion fracturing |
| CN113249101B (en) * | 2021-05-20 | 2022-03-08 | 东南大学 | Preparation method of water-soluble composite temporary plugging agent for diversion fracturing |
| CN115850573A (en) * | 2021-09-24 | 2023-03-28 | 中国石油化工股份有限公司 | Temporary plugging agent and preparation method and application thereof |
| CN115850573B (en) * | 2021-09-24 | 2023-11-07 | 中国石油化工股份有限公司 | Temporary plugging agent and preparation method and application thereof |
| CN113956859A (en) * | 2021-10-25 | 2022-01-21 | 山东恒立重装新技术有限公司 | Temporary plugging ball and manufacturing method thereof |
| CN113956859B (en) * | 2021-10-25 | 2023-01-17 | 山东恒立重装新技术有限公司 | Temporary plugging ball and manufacturing method thereof |
| CN113929816A (en) * | 2021-11-24 | 2022-01-14 | 四川轻化工大学 | High-strength profile control agent and preparation method thereof |
| CN114774102A (en) * | 2022-06-21 | 2022-07-22 | 山东科兴化工有限责任公司 | Degradable rope knot type temporary plugging agent for fracturing and preparation method thereof |
| CN114774102B (en) * | 2022-06-21 | 2022-09-02 | 山东科兴化工有限责任公司 | Degradable rope knot type temporary plugging agent for fracturing and preparation method thereof |
| CN116355600A (en) * | 2023-02-15 | 2023-06-30 | 西安博宏石油科技有限公司 | Temperature switch type temporary plugging agent and preparation method and application thereof |
| CN116355600B (en) * | 2023-02-15 | 2024-04-26 | 西安博宏石油科技有限公司 | Temperature switch type temporary plugging agent and preparation method and application thereof |
| CN116716089A (en) * | 2023-06-09 | 2023-09-08 | 浙江神耀石化科技有限公司 | Composite water-soluble temporary plugging agent for oilfield steering fracturing construction |
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