Method for preparing residue free fracturing fluid

A preparation method and a residue-free technology, applied in the field of fracturing fluid, can solve the problems of permeability and formation permeability damage, affecting fracturing stimulation effect, residual microgel, etc., achieving low surface tension, good anti-swelling effect, The effect of continuous preparation

Inactive Publication Date: 2006-11-22
DAGANG OIL FIELD GRP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of vegetable gum fracturing fluid is that there are residues, which mainly come from two aspects: ① water-insoluble substances in the vegetable gum itself; ② microgels that are not completely broken.
Residues cause irreversible damage to the permeability of the fracture support zone and the formation permeability, seriously affecting the stimulation effect of fracturing

Method used

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  • Method for preparing residue free fracturing fluid
  • Method for preparing residue free fracturing fluid
  • Method for preparing residue free fracturing fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. Add 6 grams of NaOH and 13.5 grams of KCl into 300 mL of water, stir to make them fully dissolve, and form a residue-free fracturing fluid base fluid;

[0024] 2. Add 15 grams of unsaturated fatty acid with 18 carbon atoms to 300 mL of base liquid under high-speed stirring, stir until the vortex is closed, and form a residue-free product with a viscosity of 60-150 mPa.s (milliPascal seconds) within 60 seconds. Fracturing fluid.

Embodiment 2

[0026] 1. Add 12 grams of KCl to 300 mL of water to fully dissolve it to form a residue-free fracturing fluid base fluid;

[0027] 2. Add 5 grams of unsaturated fatty acid salt with 18 carbon atoms to 300 mL of base liquid under high-speed stirring, stir until the vortex is closed, and form a liquid with a viscosity of 50-160 mPa.s (milliPascal seconds) within 60 seconds. Residue-free fracturing fluid.

[0028] For the effect test of embodiment 1:

[0029] The performance test of non-residue fracturing fluid is carried out with reference to the standard SY / T 5107-1995 "Performance Evaluation of Water-based Fracturing Fluid".

[0030] (1) Viscosity-temperature performance (the experimental instrument is a German HAAK RV30 rotational viscometer)

[0031] figure 1 Viscosity-temperature performance curve of no-residue fracturing fluid

[0032] temperature, ℃

30

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Fracturing fluid viscosity, mPa.s

1...

Embodiment 3～6

[0078] Embodiment 3~6 and effect test thereof

[0079] Example

[0080] temperature, ℃

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Abstract

The present invention relates to a kind of fracturing fluid used in oil and gas field development process, fracturing stimulation measures, the present invention provides an effective method, that is to use unsaturated fatty acid salt with 18 carbon atoms mixed with brine or 18 A fatty acid with 2 carbon atoms, an inorganic base, and brine are mixed. In the brine, the fatty acid salt increases the fluid viscosity and viscoelasticity due to the formation of highly entangled rod-shaped micelles, so as to meet the viscosity requirements of the fracturing fluid. The viscosity of this fracturing fluid depends on the nature of the micelles, which can be disrupted by changing the structure of the micelles. When the fracturing fluid encounters hydrocarbons or is diluted by formation water, it will break the gel without residue, so as to solve the problem of vegetable glue fracturing fluid residues and reduce the impact of residues on the permeability of the fracturing fracture support zone and the formation The damage caused by permeability can improve the stimulation effect of fracturing. At the same time, it provides a new way for fracturing fluid preparation.

Description

technical field [0001] The invention relates to a fracturing fluid used for fracturing stimulation measures in the development process of oil and gas fields, which belongs to the working fluid used in fracturing construction in petroleum development. Background technique [0002] The existing fracturing fluid preparation technology mainly uses vegetable glue (linear macromolecules) as a thickener, which is cross-linked with a cross-linking agent under suitable conditions to form a polymer network structure to achieve the viscosity of the fracturing fluid. The gel breaking of this type of fracturing fluid must use a chemical gel breaker to destroy the polymer network structure, reduce the viscosity of the fracturing fluid, and achieve the purpose of gel breaking. The disadvantage of vegetable gum fracturing fluid is that there are residues, which mainly come from two aspects: ① water-insoluble substances in the vegetable gum itself; ② microgels left after the gel is not compl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/04E21B43/16
Inventor 陈紫薇张胜传唐秀群
Owner DAGANG OIL FIELD GRP
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