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Method for preparing amphiprotic polyacrylamide oil field compression fracture thickening agent

A polyacrylamide and thickener technology, applied in the field of application, can solve the problems of difficult removal of solid powder, long storage period, low emulsion stability, etc., and achieve low gel filtration loss, good viscoelasticity, high viscosity and temperature good stability effect

Inactive Publication Date: 2008-08-06
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2. Emulsion products obtained by traditional emulsion methods: synthesis is difficult, the stability of the emulsion itself is low, and the storage period is generally not long
[0010] The amount of emulsifier is relatively large, sometimes it is necessary to add co-emulsifier, the dispersion medium is oil phase, the cost is high, it is difficult to remove when preparing solid powder, and it is easy to cause secondary pollution during use

Method used

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  • Method for preparing amphiprotic polyacrylamide oil field compression fracture thickening agent
  • Method for preparing amphiprotic polyacrylamide oil field compression fracture thickening agent
  • Method for preparing amphiprotic polyacrylamide oil field compression fracture thickening agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In a 250ml four-necked bottle, add 30 parts of white oil by mass, 4 parts of Span80 (sorbitan monooleate), 1 part of OP-7 (nonylphenol polyoxyethylene (7) ether), 1 part of OS-15 (fatty alcohol polyoxyethylene (15) ether), 1 part of methyl acrylate, and then add 80 parts of water phase (the water phase contains 10 parts of distilled water, 15 parts of acrylamide, 15 parts of formaldehyde R group allyl ammonium chloride, R is C 2 ~C 14 Alkyl, 20 parts of acrylic acid, 20 parts of 25% ammonia); through N 2 Oxygen was exhausted for 0.5 hours, 0.02 part of ammonium persulfate was added, the reaction was initiated by heating to 40° C., and the polymerization reaction was carried out for 5 hours to obtain a uniform and stable inverse emulsion product.

Embodiment 2～19

[0034] Respectively change acrylamide, acrylic acid, methyl R allyl ammonium chloride, R to C 2 ~C 14 The alkyl group, N, N-methylenebisacrylamide content, the polymerization reaction as in Example 1 occurs, and a series of inverse emulsion products are obtained, which are characterized. The results are listed in Table 1:

[0035] Table 1

[0036]

Example

Acrylamide

content

Wt%

acrylic containing

quantity

Wt%

Methyl R group

Allyl chloride

Ammonium content

Wt%

N, N-methane double

Acrylamide contains

Amount Wt%

M n (×10 7 )

Viscosity (1%

solution)

mPa·s

2

8.0

13.5

10.0

0

1.48

101.2

3

9.0

13.5

10.0

0

1.51

117.8

4

10.0

13.5

10.0

0

1.60

130.5

5

11.0

13.5

10.0

0 ...

Embodiment 33

[0042] Dissolve latex or solid powder in water to prepare a 1wt% aqueous solution, let it stand for 20 minutes to increase the viscosity, adjust the pH value to 5-7, and add C with a mass ratio of 0.6‰ r 3+ The cross-linking agent is cross-linked at a room temperature of 25°C to obtain a thickener jelly.

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PUM

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Abstract

An amphiprotic polyacrylamide oil field fracturing gelatinizer and a preparation process are disclosed. The gelatinizer has the structural formula which is showed by I, wherein R1 is H or CH3, R2 is C1-C4 alkyl, R3 is C2-C14 alkyl, m1, m2 and m5 are integers from 2 to 10, m3 is an integer from 0 to 100, and m4 is the integer from 0 to 1. The preparation process comprises using the compound of dehydration sorbic alcohol fatty acid ester, nonyl phenol polyoxyethylene ether and fatty alcohol polyoxyethylene ether non-ionic emulsifier as emulsifier, using acrylamide, acroleic acid or methacrylic acid, methyl alkyl pi-allyl ammonium chloride, N, N -methylene bisacrylamide as monomer, obtaining even and stable invert emulsion through conducting invert emulsion system polymerization reaction for water, oil, alcohol, amine sulphurate and ethanedioic acid hexamethylene diamine, and conducting cross-linking through utilizing Cr3+, Zr4+ and Ti4+, -CHO, or the structural formula II as cross linking agent to obtain gelatinizer gel.

Description

technical field [0001] The invention relates to a fast-crosslinking and easy-to-break amphoteric polyacrylamide polymer thickener for drilling and fracturing in oil fields and a preparation method thereof, and can also be used in application fields such as oil field water plugging and tertiary oil recovery. Background technique [0002] Today, when energy resources are gradually scarce, how to maximize the use of existing resources has become a hot research topic. As an important energy resource, petroleum occupies an indispensable position in social development. Tertiary oil recovery and fracturing technology account for most of the proportion in modern oilfield production increase and efficiency increase schemes, and thickener plays an indispensable role in it. Polymer thickeners are now developed from natural polymers to synthetic polymer thickeners. Synthetic polymer thickeners have the characteristics of less dosage, high efficiency, low toxicity, storage resistance, an...

Claims

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Application Information

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IPC IPC(8): C09K8/60C08F220/56C08F2/32C08F8/00
Inventor 高庆何普武徐祖顺余训民程时远
Owner HUBEI UNIV
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