CN105254813A - Preparation method of low-permeation reservoir fracturing hydrophobic response type polymers - Google Patents
Preparation method of low-permeation reservoir fracturing hydrophobic response type polymers Download PDFInfo
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Abstract
The invention relates to a preparation method of low-permeation reservoir fracturing hydrophobic response type polymers. The polymers are prepared from allyl cyclodextrins (ACD), acrylamide hexanoic acid (AMHC) and acrylamide (AM). The polymers which have the molecular weight of 5.0*10<3> to 1.5*10<4> and can be used for fracturing liquid are prepared by regulating and controlling of isopropyl alcohol. According to the technical scheme, AM with concentration of 0.5 g/mL and AMHC with concentration of 0.5 g/mL are added to an ACD aqueous solution with concentration of 0.01 g/mL, and the molar ratio of AM to AMHC to ACD to isopropyl alcohol is 79.2-94.2 to 20-5 to 0.8 to 8-10, and the polymers are prepared after the reaction is conducted for 24 hours at a temperature of 5-10 DEG C under a potassium persulfate and sodium hydrogen sulfite redox system. By means of the method, automatic reservoir gel breaking of the low-permeation reservoir fracturing polymers is achieved without additional gel breaking agents.
Description
Technical field
The present invention relates to the preparation method of the hydrophobic response type polymer of a kind of low-permeability oil deposit pressure break.
Background technology
Have passed through semicentennial Oil extraction in China, present most of oil field is all in the hyposmosis stage.Acid-fracture technology improves the most effective means of Recovery Factor of Low-Permeability Reservoirs, and some have novel pressure break polymkeric substance development such as thickness modified polyacrylamide, treated starch, melon glue of high-performance prop-carrying capacity rapidly.Although these new polymers prop-carrying capacities are strong, enter after oil reservoir due to still thickness, must it be made thinning for additional gel breaker, reach and the propping agents such as sand grains are stayed oil reservoir and fracturing liquid is counter arranges.
Summary of the invention
The object of the invention is to: for oil reservoir hydrophobic character, spy provides the preparation method of the hydrophobic response type polymer of a kind of low-permeability oil deposit pressure break.This polymer formulae as shown in Figure 1, due on polymkeric substance long-chain with cyclodextrin side base and hydrophobic side base, therefore cyclodextrin inner chamber assembling hydrophobic side base in aqueous, polymkeric substance associates each other and solution viscosity is increased.When the fracturing liquid be made up of this polymkeric substance enters oil reservoir, because oil reservoir is hydrophobic, crude oil molecule competes cyclodextrin inner chamber, makes former associative structure dissociation, polymkeric substance viscosity degradation, this just in time achieve fracturing liquid automatically broken glue can instead arrange.
In order to achieve the above object, the present invention by the following technical solutions: adopt Virahol to prevent polymer molecule quantitative change large as adjusting control agent, monomer adopts allyl group cyclodextrin (ACD), acrylamido caproic acid (AMHC) and acrylamide (AM) three kinds of monomers.
A kind of low-permeability oil deposit pressure break preparation method of hydrophobic response type polymer comprises the following steps:
Be in the ACD aqueous solution of 0.01g/mL in concentration, add AM and AMHC that concentration is 0.5g/mL, AM, AMHC, ACD and Virahol mol ratio are followed successively by 79.2-94.2:20-5:0.8:8-10, then potassium persulfate oxidation agent that concentration is 0.01g/mL is added successively and concentration is 0.01g/mL sodium bisulfite reductive agent, be mixed evenly rear inflated with nitrogen 10-30min, at 5-10 DEG C, react 24h again, obtain AM/AMHC/ACD terpolymer.
AM/AMHC/ACD terpolymer infrared structure characterizes as shown in Figure 2.
Compared with prior art, the present invention has following beneficial effect: the preparation method of AM/AMHC/ACD polymkeric substance is simple and feasible, and reaction conditions easily realizes.Polymericular weight prepared by the method is 5.0 × 10
3-1.5 × 10
4between, can reach and take sand and hydrophobic broken glue object automatically.
Accompanying drawing explanation
Fig. 1 is AM/AMHC/ACD terpolymer molecular structure of the present invention.
Fig. 2 is AM/AMHC/ACD terpolymer Infrared Characterization collection of illustrative plates of the present invention.
Embodiment
Below by embodiment, the present invention is further described.
embodiment 1
Be that the ACD aqueous solution 50mL of 0.01g/mL joins in 150mL beaker by the concentration prepared, then add AMHC aqueous solution 3mL that concentration is 0.5g/mL, concentration is 0.5g/mLAM aqueous solution 7mL and 0.2g Virahol.Then to add concentration be successively the agent of 0.01g/mL potassium persulfate oxidation and concentration is 0.01g/mL sodium bisulfite reductive agent.Magnetic stirring apparatus fully stirs inflated with nitrogen 20min deoxygenation after being mixed evenly, reacts 24h at 5 DEG C, obtain transparent thickness AM/AMHC/ACD terpolymer.
By the intrinsic viscosity of standard test AM/AMHC/ACD polymers soln described in GB12005.1-89, then according to the molecular weight of GB/T12005.10-92 standard test polymkeric substance, the molecular weight recording AM/AMHC/ACD polymkeric substance is M=2.11 × 10
6, but when AM/AMHC/ACD polymers soln adds a small amount of diesel oil, record molecular weight by same method be only M=6.11 × 10
3.
Claims (2)
1. the low-permeability oil deposit pressure break preparation method of hydrophobic response type polymer, it is characterized in that this polymkeric substance is made up of allyl group cyclodextrin (ACD), acrylamido caproic acid (AMHC) and acrylamide (AM) three kinds of monomers, by the obtained molecular weight of Virahol regulation and control 5.0 × 10
3-1.5 × 10
4between, can be used for of the fracturing fluid polymkeric substance.
2. as right 1 require as described in low-permeability oil deposit pressure break by hydrophobic response type polymer preparation method be: be in the ACD aqueous solution of 0.01g/mL in concentration, add AM and AMHC that concentration is 0.5g/mL, AM, AMHC, ACD and Virahol mol ratio are followed successively by 79.2-94.2:20-5:0.8:8-10, then potassium persulfate oxidation agent that concentration is 0.01g/mL is added successively and concentration is 0.01g/mL sodium bisulfite reductive agent, be mixed evenly rear inflated with nitrogen 10-30min, at 5-10 DEG C, react 24h again, obtain AM/AMHC/ACD terpolymer.
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| CN105254813B CN105254813B (en) | 2018-08-24 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106833593A (en) * | 2016-12-06 | 2017-06-13 | 西南石油大学 | A kind of preparation method of the aqueous fracturing fluid of superior performance |
| CN108329897A (en) * | 2018-01-09 | 2018-07-27 | 中国石油大学(华东) | Oil base drilling fluid |
| CN110317345A (en) * | 2018-03-29 | 2019-10-11 | 中国石油化工股份有限公司 | A kind of cyclodextrin star-type polymer and its preparation method and application and fracturing fluid |
| CN110655612A (en) * | 2019-10-18 | 2020-01-07 | 西南石油大学 | Hydrophobic association polymer, preparation method thereof and application of hydrophobic association polymer in high-temperature-resistant fracturing fluid |
| CN113549443A (en) * | 2021-07-23 | 2021-10-26 | 长江大学 | Biological gel fracturing fluid thickening agent and preparation method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101104665B (en) * | 2007-04-29 | 2010-05-19 | 西南石油大学 | AM/NaAA/allylcyclodextrin polymer with inclusion function and synthetic method thereof |
| CN102229692B (en) * | 2011-05-16 | 2013-02-06 | 西南石油大学 | Temperature and salt-resistant AM/ACD/AE copolymer and its preparation method |
| CN102660250B (en) * | 2012-04-17 | 2014-10-15 | 西南石油大学 | Cation hydrophobic associating polymer oil displacement agent and preparation method thereof |
| CN103289667B (en) * | 2013-05-13 | 2015-04-22 | 西南石油大学 | Flow improver for shale gas reservoir fracturing and preparation method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106833593A (en) * | 2016-12-06 | 2017-06-13 | 西南石油大学 | A kind of preparation method of the aqueous fracturing fluid of superior performance |
| CN106833593B (en) * | 2016-12-06 | 2019-02-22 | 西南石油大学 | A kind of preparation method of aqueous fracturing fluid |
| CN108329897A (en) * | 2018-01-09 | 2018-07-27 | 中国石油大学(华东) | Oil base drilling fluid |
| CN110317345A (en) * | 2018-03-29 | 2019-10-11 | 中国石油化工股份有限公司 | A kind of cyclodextrin star-type polymer and its preparation method and application and fracturing fluid |
| CN110317345B (en) * | 2018-03-29 | 2021-10-29 | 中国石油化工股份有限公司 | Cyclodextrin star-shaped polymer, preparation method and application thereof, and fracturing fluid |
| CN110655612A (en) * | 2019-10-18 | 2020-01-07 | 西南石油大学 | Hydrophobic association polymer, preparation method thereof and application of hydrophobic association polymer in high-temperature-resistant fracturing fluid |
| CN110655612B (en) * | 2019-10-18 | 2021-10-22 | 西南石油大学 | Hydrophobically associating polymer, preparation method thereof and application of hydrophobically associating polymer in high-temperature-resistant fracturing fluid |
| CN113549443A (en) * | 2021-07-23 | 2021-10-26 | 长江大学 | Biological gel fracturing fluid thickening agent and preparation method thereof |
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