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Zwitterionic polymer, preparation method of zwitterionic polymer and application in hydrochloric acid-base fracturing fluid

A technology based on amphoteric ion and hydrochloric acid, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., to achieve the effect of reliable principle, broad market prospect and convenient operation

Inactive Publication Date: 2013-05-29
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned polymers are faced with the problem of how to improve the temperature resistance, salt resistance and shear resistance of the polymer in the actual use process.

Method used

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  • Zwitterionic polymer, preparation method of zwitterionic polymer and application in hydrochloric acid-base fracturing fluid
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  • Zwitterionic polymer, preparation method of zwitterionic polymer and application in hydrochloric acid-base fracturing fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] (1) Preparation of AM / DMC / AMPS polymer

[0059] ① Preparation of dimethylaminoethyl methacrylate (DMAEMA)

[0060] A. In a 250ml three-necked bottle with a thermometer, a condenser, and a fractionating column, add quantitative N,N-dimethylethanolamine (DMAE), excess methyl methacrylate (MMA), and an appropriate amount of polymerization inhibitor phenothione Oxazine and an appropriate amount of catalyst tetrabutyl titanate. The molar ratio of DMEA:tetrabutyl titanate is 1:0.075, and the molar ratio of phenothiazine:DMAE is 0.0050:1.

[0061] B. Heat slowly to maintain the reaction temperature in the bottle at 95-98°C, and the temperature at the top of the fractionating column is 63-65°C. The generated methanol and excess methyl methacrylate form an azeotrope and distill it at a reflux ratio of 3:1. The reaction time is 4 ~5 hours.

[0062] C. After the reaction, reduce the pressure to 4×10 4 Pa, the temperature at the top of the tower is 40-45°C, the remaining met...

Embodiment 2

[0085] (1) 20% hydrochloric acid-based fracturing fluid formula

[0086] Hydrochloric acid: 20%

[0087] The thickener is AM / DMC / AMPS amphoteric polymer: 0.6%

[0088] The corrosion inhibitor is dodecyl pyridinium bromide: 2.0%

[0089] Drainage aid is methanol: 1.0%

[0090] Clay stabilizers are cationic polyquaternium salts of epichlorohydrin and dimethylamine: 0.5%

[0091] Iron ion stabilizer is ethylenediaminetetraacetic acid sodium salt: 1.0%

[0092] Water: 74.9%

[0093] Cross-link weight ratio: 100:2.0

[0094] (2) Performance indicators of 20% hydrochloric acid-based fracturing fluid

[0095] The density is 1.10g / cm 3 , The viscosity of the base fluid at 20°C is 31.7mPa.s. The zirconium crosslinking agent with a crosslinking weight ratio of 100:2.0 is used for crosslinking, and the jelly is in 170s -1 , Viscosity at 120°C is 139mPa.s; gelation time is about 32s; ammonium persulfate is used as the breaker, and when the weight ratio of the breaker is 0.05% (50...

Embodiment 3

[0097] (1) 28% hydrochloric acid-based fracturing fluid formula

[0098] Hydrochloric acid: 28%

[0099] The thickener is AM / DMC / AMPS amphoteric polymer: 0.8%

[0100] Corrosion inhibitor is hexadecyl pyridinium bromide: 1.0%

[0101] Drainage aid is ethanol: 0.5%

[0102] Clay stabilizers are cationic polyquaternium salts of epichlorohydrin and dimethylamine: 0.5%

[0103] Iron ion stabilizer is sodium erythorbate: 1.0%

[0104] Water: 68.2%

[0105] Cross-link weight ratio: 100:2.5

[0106] (2) Performance indicators of 28% hydrochloric acid-based fracturing fluid

[0107] The density is 1.14g / cm 3 , The viscosity of the base fluid at 20°C is 47.8mPa.s. The zirconium cross-linking agent with a cross-linking weight ratio of 100:2.5 is used for cross-linking, and the jelly is in 170s -1 , Viscosity at 120°C is 186mPa.s; gelation time is about 18s; ammonium persulfate is used as the breaker, and when the weight ratio of the breaker is 0.1% (1000ppm), the viscosity of t...

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Abstract

The invention relates to a zwitterionic polymer, a preparation method of the zwitterionic polymer and application in hydrochloric acid-base fracturing fluid. The preparation method comprises the following steps of: carrying out transesterification of methyl methacrylate and N,N-dimethylethanolamine to obtain 2-(dimethylamino)ethyl methacrylate (DMAEMA); reacting DMAEMA with CH[3]Cl to obtain methacryloyloxyethyl trimethyl ammonium chloride (DMC); and carrying out ternary copolymerization of DMC, acrylamide (AM) and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) to obtain the zwitterionic polymer. The polymer is used as a thickening agent and blended with a corrosion inhibitor, an iron ion stabilizer, a clay stabilizer and a cleanup additive to obtain hydrochloric acid-base fracturing fluid. The polymer has the properties of high temperature resistance, salt-resistance and shear resistance. The preparation method has the advantages of reliable principle and simple operation. The hydrochloric acid-base fracturing fluid using the polymer as the thickening agent can realize acid-carrying sand process, and thus the polymer is specially suitable for acid-sand reconstruction of complexlithologic reservoirs, high pollution and inefficient reservoirs and high alkali-sensitive mineral reservoirs.

Description

technical field [0001] The invention relates to a zwitterionic polymer, its preparation method and its application in hydrochloric acid-based fracturing fluid, which is suitable for reservoir transformation in petroleum engineering, especially the fracturing fluid technology in hydraulic fracturing construction. Background technique [0002] Fracturing and acidizing production stimulation technology has made outstanding contributions to the stimulation and transformation of old oil and gas fields in my country and the exploration and development of new oil and gas fields, and has become a key technology for the development of complex oil and gas reservoirs and hard-to-recover reserves. With the deepening of oil and gas exploration and development, it is becoming more and more difficult to exploit oil and gas reservoirs such as high temperature / ultra-high temperature, complex lithology reservoirs, complex fluid reservoirs, old oil fields with medium and high water cut, low pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/34C08F220/56C08F220/58C09K8/68C08G73/00
Inventor 赵金洲刘长宇陈红军方天成
Owner SOUTHWEST PETROLEUM UNIV
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