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Quaternary ammonium salt type surfactant fracturing fluid

A technology of surfactant and quaternary ammonium salt, which is applied in the field of quaternary ammonium salt type viscoelastic surfactant fracturing fluid, can solve problems such as difficult to meet the effective development of oil and gas reservoirs, and achieve easy industrial production, mild reaction conditions, and a preparation method simple effect

Active Publication Date: 2011-09-14
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] High-temperature oil and gas reservoirs are widely distributed in my country, and the oil and gas reserves are very rich. The existing fracturing fluid system is difficult to meet the effective development of this kind of oil and gas reservoirs.

Method used

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  • Quaternary ammonium salt type surfactant fracturing fluid
  • Quaternary ammonium salt type surfactant fracturing fluid
  • Quaternary ammonium salt type surfactant fracturing fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Synthesis of diionic headgroup surfactants

[0039] Take 1 mol of 1,4-butanediamine, 2 mol of formic acid, and 2 mol of formaldehyde in a reaction kettle, react at 70°C for 8 hours, and cool to room temperature after the reaction. Next, 2 mol of octadecane chloride was added to the reaction kettle, and reacted at 80° C. for 8 hours to obtain a white paste product, numbered De-18-4.

[0040] (2) Synthesis of triionic headgroup surfactants

[0041]Take 1 mol of dialkylenetriamine, 5 mol of formic acid, and 5 mol of formaldehyde in a reaction kettle, react at 70° C. for 8 hours, and cool to room temperature after the reaction. Next, 3 mol of dodecane chloride was added to the reaction kettle, and reacted at 80° C. for 8 hours to obtain a white paste product, numbered Tr-12-2.

[0042] (3) Synthesis of tetraionic headgroup surfactants

[0043] Take 1 mol of trialkylenetetramine, 7 mol of formic acid, and 7 mol of formaldehyde in a reaction kettle, react at 70° C. for...

Embodiment 2

[0045] The high-temperature-resistant viscoelastic surfactant fracturing fluid is composed of: 4.5% De-18-4 surfactant, 0.5% ammonium chloride, 1% potassium chloride, 0.4% methyl Sodium benzenesulfonate and the balance of water.

Embodiment 3

[0047] The high temperature resistant viscoelastic surfactant fracturing fluid is composed by weight percentage: 3.5% Tr-14-2, 0.5% sodium chloride, 0.1% salicylic acid, 0.1% potassium benzenesulfonate, 0.1% ammonium benzenesulfonate and the balance water.

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Abstract

The invention relates to a quaternary ammonium salt type surfactant fracturing fluid which is prepared from the following components in percentage by weight: 0.1-7% of double ionic head group / three ionic head group / four ionic head group quaternary ammonium salt type surfactant, 0.1-2% of salt and the balance of water. The quaternary ammonium salt type surfactant belongs to an amphiphilic structure surfactant; the preparation method is simple, has the advantage of mild reaction conditions, and can easily implement industrial production; and the surfactant has obvious viscoelasticity in a dilute solution, is a low-molecular thickening agent with excellent properties, and can satisfy the demands for high-temperature oil-gas reservoirs of which the oil reservoir temperature is 120 DEG C.

Description

technical field [0001] The invention relates to a fracturing fluid of a quaternary ammonium salt type viscoelastic surfactant suitable for high-temperature oil and gas reservoir reconstruction. Background technique [0002] Hydraulic fracturing is an effective method to transform oil and gas reservoirs and obtain industrial production capacity. In the process of fracturing construction, the performance of fracturing fluid is directly related to the success or failure of fracturing construction and the effect of post-fracture stimulation. At present, water-based fracturing fluid thickeners are mostly high-molecular substances such as guar gum, hydroxypropyl cellulose, and polyacrylamide. This type of polymer material has poor solubility and dispersibility, and there are many water-insoluble substances. Analysis of the flowback fluid after fracturing operations shows that the fracturing fluid returned to the ground only accounts for 30% to 45% of the pumped volume, and most o...

Claims

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Application Information

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IPC IPC(8): C09K8/68B01F17/18C09K23/18
Inventor 罗平亚张福祥陈洪彭建新叶仲斌朱绕云
Owner PETROCHINA CO LTD
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