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Preparation method for salt-tolerance-type zwitter-ion hydrophobic associated polymer and application thereof in fracturing fluid

A hydrophobic association, zwitterion technology, applied in the preparation of organic compounds, the composition of drilling, the preparation of carboxylic acid amides, etc., can solve problems such as intolerance to salt, and achieve low cost, good association performance and thickening. performance, the effect of high salt resistance

Inactive Publication Date: 2019-09-20
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a salt-tolerant zwitterionic hydrophobic association polymer, its preparation method and its application in fracturing fluid, so as to solve the problem of salt intolerance existing polymers in fracturing fluid application

Method used

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  • Preparation method for salt-tolerance-type zwitter-ion hydrophobic associated polymer and application thereof in fracturing fluid
  • Preparation method for salt-tolerance-type zwitter-ion hydrophobic associated polymer and application thereof in fracturing fluid
  • Preparation method for salt-tolerance-type zwitter-ion hydrophobic associated polymer and application thereof in fracturing fluid

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Embodiment 1

[0039] (1) The preparation method of the hydrophobic monomer of the present embodiment is as follows:

[0040] Carry out the synthesis of intermediate di-n-hexadecylamine first, in a 500mL single-necked flask, dissolve hexadecane bromide of 12.073g (50mmol) of cetylamine and 16.03g (52.5mmol) in the acetonitrile solvent of 250mL, place Stir in an oil bath at 80°C with a magnetic stirring speed of 300r\min, install a condenser on the top of the flask, and reflux for 8 hours to obtain the target product. After the reaction was completed and the solidified ammonium salt appeared after cooling, a mixture of 100mL dichloromethane and 6mol\L NaOH solution (volume ratio 1:1) was added, mixed thoroughly and suction filtered to obtain a light yellow solid. It was recrystallized twice with dichloromethane, dried in vacuo to constant weight, and finally white flaky crystals were obtained.

[0041] Carry out the synthesis of hydrophobic monomer next, in the 500mL one-necked flask, the di...

Embodiment 2

[0045] Take the salt-tolerant zwitterionic hydrophobic association polymer in Example 1, prepare 0.5wt% clear water-based fracturing fluid with distilled water, -1 Under the condition of shearing for about 2 hours, the apparent viscosity is still above 120mPa.s, which meets the requirements of the industry standard SY / T6376-2008.

Embodiment 3

[0047] Take the salt-tolerant zwitterionic hydrophobic association polymer in Example 1, use 0.5wt% seawater-based fracturing fluid prepared from South China Sea seawater in Table 1, and heat it at 150°C for 170s -1 Under the condition of shearing for about 2 hours, the apparent viscosity is still above 75mPa.s, which meets the requirements of the industry standard SY / T6376-2008.

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Abstract

The invention provides a preparation method for a salt-tolerance-type zwitter-ion hydrophobic associated polymer and an application thereof in fracturing fluid. The preparation method for the hydrophobic associated polymer comprises the following steps: (1) firstly enabling cetylamine to react with bromohexadecane so as to obtain intermediate di-n-hexadecylamine, and enabling the di-n-hexadecylamine to react with methacryloyl chloride so as to obtain a polymerizable hydrophobic monomer; (2) enabling the monomer to perform light initiated polymerization with acrylamide, methacryloyloxyethyl trimethyl ammonium chloride, and 2-acryloylamino-2-methyl propyl sulfonic acid in a room temperature, after drying and smashing, to obtain polymer powder, wherein the polymer powder can be prepared as the fracturing fluid with 0.5% of concentration for use by directly using distilled water, ocean water and formation water, the fracturing fluid is good in temperature resistance, salt tolerance and shearing resistance performance, and viscosity can be maintained above 50 mPa.s after 2 hours in conditions of 150 DEG C and 170 s-1. The preparation method has the characteristics of low cost, strong environmental protection property, and convenient preparation, and has the better application prospect in the oil field fracturing fluid and improvement of oil recovery.

Description

technical field [0001] The invention relates to a zwitterionic hydrophobic association polymer for oilfield fracturing fluid, a preparation method thereof, and an application of the same as a thickener in fracturing fluid. Background technique [0002] With the continuous development of exploration and development, the proportion of tight oil and gas reservoirs in the newly added geological reserves is increasing. Such reservoirs are mainly stimulated by fracturing and stimulation measures. Therefore, in order to meet the needs of some low-permeability and ultra-low-permeability oil and gas fields in China, the development of high-efficiency and low-cost fracturing fluids has become the main goal of fracturing. Traditional natural vegetable gum and its derivative fracturing fluids generally have problems such as easy biodegradation, high water insoluble content, incomplete gel breaking, high residue content, and serious formation damage; clean fracturing fluids that have bec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C233/09C07C231/02C09K8/68C09K8/88C08F220/56C08F220/34C08F220/58C08F220/54
CPCC07C233/09C07C231/02C09K8/68C09K8/882C08F220/56
Inventor 毛金成田济祯张文龙杨小江林冲毛金桦
Owner SOUTHWEST PETROLEUM UNIV