Method for preparing high temperature retarding-type organic boron zirconium cross linking agent

A cross-linking agent and organic technology, which is applied in the field of preparation of high-temperature retarded organoboron-zirconium cross-linking agent, can solve the problems of fracturing fluid increase residue, reduce friction, increase cost, etc., and improve fracturing effect , the effect of improving the diversion capacity and improving the production capacity

Inactive Publication Date: 2012-02-01
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the 1980s, with the exploration and exploitation of deep oil and gas reservoirs, organic titanium (zirconium) and other cross-linking agents were successively developed at home and abroad. However, it is difficult to break the glue, the flowback efficiency is low, and the fracture conductivity is seriously damaged.
Since the 1990s, research on organoboron crosslinking agents has been carried out successively at home and abroad. It has the advantages of easy gel breaking and low damage. friction, but it is only suitable for use in formations below 150°C. Above this temperature, a higher concentration of guar gum and a larger amount of crosslinking agent are required to maintain the viscosity of the fluid in the fracture, which will lead to fracturing Increased fluid friction, more residue after gel breaking, and increased costs

Method used

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  • Method for preparing high temperature retarding-type organic boron zirconium cross linking agent
  • Method for preparing high temperature retarding-type organic boron zirconium cross linking agent
  • Method for preparing high temperature retarding-type organic boron zirconium cross linking agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1) Prepare a composite solvent: mix glycerol and water in a mass ratio of 1:3, and stir to obtain a composite solvent;

[0016] 2) Add 74 parts of composite solvent and 2 parts of zirconium tetrachloride to a clean flask in parts by mass, stir until completely dissolved, then add 13 parts of boric acid, and react at 60°C for 40 minutes to obtain a mixture;

[0017] 3) Add 13 parts of sorbitol, 4 parts of triethanolamine and 0.1 part of EDTA-2Na to the mixture obtained in step 2), raise the temperature to 80° C., and react for 4 hours;

[0018] 4) Adjust the pH to 7 with NaOH aqueous solution to obtain an organoboron-zirconium crosslinking agent.

[0019] After testing, the delayed crosslinking time and temperature resistance of the jelly obtained by crosslinking the organic boron zirconium crosslinking agent prepared in this example with 100mL0.5% guar gum aqueous solution at a concentration of 0.3% are as follows:

[0020]

Embodiment 2

[0022] 1) Prepare composite solvent: mix glycerol and water in a mass ratio of 1:5, and stir to obtain a composite solvent;

[0023] 2) Add 76 parts of composite solvent and 3 parts of zirconium oxychloride to a clean flask in parts by mass, stir until completely dissolved, then add 11 parts of borax, and react at 60°C for 60 minutes to obtain a mixture;

[0024] 3) Add 12 parts of mannitol, 4.3 parts of triethanolamine and 0.2 parts of EDTA-2Na to the mixture obtained in step 2), raise the temperature to 80° C., and react for 5 hours;

[0025] 4) Adjust the pH to 8 with NaOH aqueous solution to obtain an organoboron-zirconium crosslinking agent.

[0026] After testing, the delayed crosslinking time and temperature resistance of the jelly obtained by crosslinking the organoboron zirconium crosslinking agent prepared in this example with 100mL0.4% guar gum aqueous solution at a concentration of 0.3% are as follows:

[0027]

Embodiment 3

[0029] 1) Prepare a composite solvent: mix glycerol and water in a mass ratio of 1:4, and stir to obtain a composite solvent;

[0030] 2) Add 80 parts of composite solvent and 1 part of zirconium tetrachloride to a clean flask in parts by mass, stir until completely dissolved, then add 15 parts of a mixture of boron compound boric acid and borax, and react at 60°C 30min to get the mixture;

[0031] 3) Add 14 parts of sorbitol, 4.5 parts of triethanolamine and 0.15 parts of EDTA-2Na to the mixture obtained in step 2), raise the temperature to 80° C., and react for 4.5 hours;

[0032] 4) Adjust the pH to 9 with NaOH aqueous solution to obtain an organoboron-zirconium crosslinking agent.

[0033] After testing, the delayed crosslinking time and temperature resistance of the jelly obtained by crosslinking the organoboron zirconium crosslinking agent prepared in this example with 100mL0.35% guar gum aqueous solution at a concentration of 0.3% are as follows:

[0034]

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Abstract

The invention relates to a method for preparing a high temperature retarding-type organic boron zirconium cross linking agent, which comprises the following steps of: adding organic zirconium salt into a three-neck flask filled with a mixed solvent of water and glycerol; stirring to ensure the organic zirconium salt to be totally dissolved; then adding a boron compound; performing a reaction for 30 to 60 minutes at a temperature of 60 DEG C; adding polyatomic alcohol, triethanolamine and EDTA-2Na (Ethylene Diamine Tetraacetic Acid-2Na); heating to a temperature of 80 DEG C and performing a reaction for 4 to 5 hours; and regulating the pH to the range of 7 to 9 by aqueous solution of NaOH with the concentration of 20 percent to obtain the boron zirconium cross linking agent. The cross linking agent prepared by the method disclosed by the invention has the characteristics of small using amount, controllable retarding cross-linking time, high temperature resistance, easiness for gel breaking, low damage and low fraction resistance.

Description

technical field [0001] The invention belongs to a cross-linking agent in the field of oilfield exploitation, in particular to a preparation method of a high-temperature delay type organic boron-zirconium crosslinking agent in the field of oilfield exploitation. Background technique [0002] Fracturing technology is an essential measure for oil and gas field exploitation, and fracturing fluid is the main component of fracturing technology. The cross-linking agent is an important part of the fracturing fluid, and the quality of the cross-linking agent directly determines the performance of the fracturing fluid, and is also directly related to the success or failure of the fracturing operation. [0003] The crosslinking agent in water-based fracturing fluid has gone through the development process from borate to titanium, zirconium, boron polymer and other metal crosslinking agents. In the 1980s, with the exploration and exploitation of deep oil and gas reservoirs, organic tit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
Inventor 沈一丁苏莹赵秀波刘观军赵建波赖小娟
Owner SHAANXI UNIV OF SCI & TECH
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