Non-metallic cross-linking agent for ultra-high temperature fracturing fluid and fracturing fluid, as well as preparation and application

A non-metallic and cross-linking agent technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the tasks that affect the normal production and output of oil and gas reservoir reconstruction in oilfields, and cannot meet the requirements of low cost and low damage resistance of fracturing fluids. High temperature, rising guar gum prices and other issues, to achieve the effect of low cost, avoiding large damage, and less dosage

Active Publication Date: 2014-12-24
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are some problems. On the one hand, the long-chain polymer of the commonly used vegetable gum thickener degrades rapidly when the temperature reaches 177°C, and when the pH value of the system is low, the cross-linked structure of the vegetable gum fracturing fluid is hydrolyzed, especially at high temperature. Underwater hydrolysis is more serious, and with the massive development of shale gas and tight gas in the world, the demand for guar gum is increasing, which makes the price of guar gum continue to rise (from 25,000 yuan per ton in 2010 to 2012 120,000 yuan per ton per year), which not only leads to a substantial increase in fracturing costs, but also causes a shortage of supply, affecting the completion of normal production and output tasks of oil and gas reservoir transformation in oil fields
On the other hand, traditional organoboron cross-linked fracturing fluids are only suitable for use at temperatures below 150°C, and it is difficult to maintain good performance at ultra-high temperatures (above 180°C). The temperature performance is improved, but the shortcomings of the large content of organic zirconium cross-linked fracturing fluid residues that seriously damage the formation have not been resolved
[0004] In general, some of the current fracturing fluid systems meet the requirements of ultra-high temperature to a certain extent, but still cannot meet the requirements of low cost, low damage, and high temperature resistance of fracturing fluids.

Method used

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  • Non-metallic cross-linking agent for ultra-high temperature fracturing fluid and fracturing fluid, as well as preparation and application
  • Non-metallic cross-linking agent for ultra-high temperature fracturing fluid and fracturing fluid, as well as preparation and application
  • Non-metallic cross-linking agent for ultra-high temperature fracturing fluid and fracturing fluid, as well as preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048]Synthetic polymer (prepared by reacting acrylamide and 2-acrylamide-2-methylpropanesulfonic acid at a mass ratio of 2:1 at 12°C for 4 hours, with a viscosity average molecular weight of 6.53 million) 0.4%, cross 0.25% of joint agent, 0.2% of lauryl ammonium chloride, 0.1% of demulsifier SP1690.1%, 0.05% of ammonium persulfate and the rest of the water prepare the ultra-high temperature fracturing fluid of the present invention (preparation method: add 0.4% Synthesize polymer thickener, stir 1.5 hours under 400r / min rotating speed, form uniform polymer aqueous solution; Add 0.2% lauryl ammonium chloride, 0.1% demulsifier, 0.05% ammonium persulfate, mix well and then add 0.25% cross-linking agent, after stirring for 2.5 minutes, an adjustable jelly fracturing fluid can be formed.)

[0049] Wherein the crosslinking agent is composed of: organic aldehyde hexamethylenetetramine 0.5%, organic phenol resorcinol 0.05%, organic alcohol isopropanol 5%, organic acid sulfamic acid 0...

Embodiment 2

[0056] Synthetic polymer (prepared by reacting acrylamide and 2-acrylamide-2-methylpropanesulfonic acid at a mass ratio of 1:1 at 12°C for 4 hours, with a viscosity average molecular weight of 6.75 million) 0.8%, cross 0.25% of joint agent, 0.2% of lauryl ammonium chloride, 0.1% of demulsifier SP169, 0.05% of ammonium persulfate and the rest of the water prepare the ultra-high temperature fracturing fluid of the present invention (preparation method: add 0.8% synthetic Polymer thickener, stirred at 400r / min for 1 hour to form a uniform polymer aqueous solution; 0.2% lauryl ammonium chloride, 0.1% demulsifier, 0.05 % ammonium persulfate, mix well and then add 0.25% cross-linking agent, after stirring for 3.5 minutes, an adjustable jelly fracturing fluid can be formed.)

[0057] Wherein the crosslinking agent is composed of: 0.5% formaldehyde, 0.05% resorcinol, 5% n-butanol, 0.5% acetic acid, and the balance is water, prepared according to the following steps:

[0058] Add orga...

Embodiment 3

[0064] Synthetic polymer (prepared by reacting acrylamide and 2-acrylamide-2-methylpropanesulfonic acid at a mass ratio of 1.8:1 at 12°C for 4 hours, with a viscosity average molecular weight of 6.15 million) 0.8%, cross 0.25% of joint agent, 0.2% of lauryl ammonium chloride, 0.1% of demulsifier SP169, 0.3% of ammonium persulfate and the rest of the water prepare the ultra-high temperature fracturing fluid of the present invention (preparation method: add 0.8% synthetic Polymer thickener, stirred at 400r / min rotating speed for 1.5 hours to form a uniform polymer aqueous solution; in the uniform polymer aqueous solution, add 0.2% lauryl ammonium chloride, 0.1% demulsifier, 0.3 % ammonium persulfate, mix well and then add 0.25% cross-linking agent, after stirring for 4 minutes, an adjustable jelly fracturing fluid can be formed.)

[0065] Wherein the cross-linking agent is composed of: 0.5% of paraformaldehyde, 0.05% of resorcinol, 5% of isopropanol, 0.5% of formic acid, and the...

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Abstract

The invention provides a non-metallic cross-linking agent for ultra-high temperature fracturing fluid and the fracturing fluid, as well as preparation and application. The non-metallic cross-linking agent provided by the invention is mainly prepared from the following components in percentage by weight: 0.1-0.5% of organic aldehyde, 0.01-0.05% of organic phenol, 0-10% of organic alcohol, 0.05-0.5% of organic acid and the balance of water. The fracturing fluid provided by the invention has the advantages of small damage to the stratum, low cost, good temperature resistance and good gel breaking performance.

Description

technical field [0001] The invention relates to the technical field of oil and gas field reservoir reconstruction, in particular to a fracturing working fluid in oil field ultra-deep well fracturing, in particular to a non-metallic crosslinking agent for ultra-high temperature fracturing fluid, fracturing fluid, preparation and application. Background technique [0002] In recent years, with the in-depth understanding of the geological laws of deep oil and gas reservoirs and the improvement of exploration technology, important progress has been made in the exploration of deep oil and gas reservoirs, and the requirements for fracturing technology are getting higher and higher. With the advancement of oil exploration technology, the development of oil and gas resources continues to develop in depth, the drilling is getting deeper and deeper, and the reservoir temperature is getting higher and higher. Higher requirements are put forward for the temperature and shear resistance o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C08G8/32
CPCC08G8/32C09K8/685C09K8/882C09K8/887
Inventor 王超欧阳坚朱卓岩薛俊杰王凤王源源
Owner PETROCHINA CO LTD
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