Cross-linking agent for fracturing fluid with ultralow hydroxypropyl guar concentration and fracturing fluid prepared from cross-linking agent

A technology of ultra-low hydroxypropyl melon and fracturing fluid, applied in drilling compositions, chemical instruments and methods, etc., can solve the problem of high residue content, achieve low residue content, good sand-carrying performance, and reduced dosage. Effect

Active Publication Date: 2012-10-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN 102329602 A discloses an ultra-low concentration fracturing fluid and a preparation method thereof. The disclosed fracturing fluid uses 0.3%-0.35% hydroxypropyl guar gum and an inorganic boron crosslinking agent, which can make t

Method used

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  • Cross-linking agent for fracturing fluid with ultralow hydroxypropyl guar concentration and fracturing fluid prepared from cross-linking agent
  • Cross-linking agent for fracturing fluid with ultralow hydroxypropyl guar concentration and fracturing fluid prepared from cross-linking agent
  • Cross-linking agent for fracturing fluid with ultralow hydroxypropyl guar concentration and fracturing fluid prepared from cross-linking agent

Examples

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Embodiment 1

[0045] This embodiment provides a cross-linking agent for fracturing fluid with an ultra-low hydroxypropyl guar concentration and a fracturing fluid prepared therefrom.

[0046] The cross-linking agent provided in this embodiment includes the following components in parts by mass:

[0047] 450 parts of water;

[0048] 150 parts of sodium gluconate;

[0049] 100 parts of borax;

[0050] 70 parts of sorbitol;

[0051] 10-50 parts of sodium hydroxide.

[0052] The cross-linking agent provided in this embodiment is prepared according to the following steps:

[0053] Stir and mix the sodium gluconate and water evenly, slowly add borax under stirring conditions, and then react at 70°C-80°C for 2 hours to obtain a mixture;

[0054]Adding sodium hydroxide to the mixture to adjust the pH value to 6-8, stirring and reacting at 70°C-80°C for 3 hours;

[0055] Then add sorbitol, stir and react at 70°C-80°C for 1 hour to prepare the crosslinking agent.

[0056] The present embodimen...

Embodiment 2

[0072] This embodiment provides a cross-linking agent for fracturing fluid with an ultra-low hydroxypropyl guar concentration and a fracturing fluid prepared therefrom.

[0073] The cross-linking agent provided in this embodiment includes the following components in parts by mass:

[0074] 450 parts of water;

[0075] Sodium gluconate 180 parts;

[0076] 150 parts of borax compound;

[0077] 70 parts of sorbitol;

[0078] 10-50 parts of sodium hydroxide.

[0079] The cross-linking agent provided in this embodiment is prepared according to the following steps:

[0080] Stir and mix the sodium gluconate and water evenly, slowly add borax under stirring conditions, and then react at 70°C-80°C for 2 hours to obtain a mixture;

[0081] Adding sodium hydroxide to the mixture to adjust the pH value to 6-8, stirring and reacting at 70°C-80°C for 3 hours;

[0082] Then add sorbitol, stir and react at 70°C-80°C for 1 hour to prepare the crosslinking agent.

[0083] The present em...

Embodiment 3

[0099] This embodiment provides a cross-linking agent for fracturing fluid with an ultra-low hydroxypropyl guar concentration and a fracturing fluid prepared therefrom.

[0100] The cross-linking agent provided in this embodiment includes the following components in parts by mass:

[0101] 450 parts of water;

[0102] Sodium gluconate 230 parts;

[0103] 250 parts of borax compound;

[0104] Xylitol 130 parts;

[0105] 10-50 parts of sodium hydroxide.

[0106] The cross-linking agent provided in this embodiment is prepared according to the following steps:

[0107] Stir and mix the sodium gluconate and water evenly, slowly add borax under stirring conditions, and then react at 70°C-80°C for 2 hours to obtain a mixture;

[0108] Adding NaOH to the mixture to adjust the pH value to 6-8, stirring and reacting at 70°C-80°C for 3 hours;

[0109] Then add xylitol, and stir and react at 70°C-80°C for 1 hour to prepare the crosslinking agent.

[0110] The present embodiment pro...

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Abstract

The invention relates to a cross-linking agent for fracturing fluid and preparation method of the cross-linking agent. The cross-linking agent comprises the following components in parts by mass: 450 to 650 parts of water, 150 to 250 parts of salt of organic acid, 100 to 250 parts of boron compound, 50 to 150 parts of polylol and 10 to 50 parts of sodium hydroxide. The method for preparing the cross-linking agent comprises the following steps of: mixing the salt of organic acid and water and adding the mixture into the boron compound, and reacting at the temperature of 70 to 80 DEG C for 2 hours; adding the sodium hydroxide to regulate the pH value to 6 to 8, and reacting at the temperature of 70 to 80 DEG C for 3 hours; adding the polylol, reacting at the temperature of 70 to 80 DEG C for 1 hour, and preparing the cross-linking agent. The invention also relates to fracturing fluid with ultralow hydroxypropyl guar concentration. The fracturing fluid mainly comprises the following components in parts by volume: 96.1 to 98.2 parts of aqueous solution of hydroxypropyl guar and 0.25 to 0.4 part of the cross-linking agent. According to the fracturing fluid, the amount of thickening agent can be reduced, so that the damage and cost are reduced.

Description

technical field [0001] The invention relates to a crosslinking agent for fracturing fluid and a preparation method thereof, as well as a fracturing fluid under the condition of an ultra-low hydroxypropyl guar gum concentration thickener and a preparation method thereof, and belongs to the technical field of petroleum exploitation. Background technique [0002] After nearly a hundred years of research and development of fracturing stimulation fluids, a variety of fracturing fluid systems have been formed, mainly water-based fracturing fluids, emulsified fracturing fluids, foam fracturing fluids, etc., but hydroxypropyl Guar gum is the thickener and a small amount of cross-linking agent is added to form a cross-linked jelly fracturing fluid is still the most commonly used fracturing fluid for oil and gas field development and fracturing at home and abroad. [0003] The damage of hydroxypropyl guar gum fracturing fluid to the reservoir mainly comes from water-insoluble substanc...

Claims

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Application Information

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IPC IPC(8): C09K8/68
Inventor 卢拥军王丽伟程兴生管保山刘萍崔伟香崔明月刘玉婷翟文
Owner PETROCHINA CO LTD
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