Process for stabilized zirconium triethanolamine complex and uses in oil field applications

一种三乙醇胺、络合物的技术，应用在钻孔的组合物、化学仪器和方法、周期表第4/14族元素的化合物等方向，能够解决络合物昂贵等问题

Inactive Publication Date: 2009-12-16
DORF KETAL SPECIALITY CATALYSTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High loadings of triethanolamine also make these complexes very expensive

Method used

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  • Process for stabilized zirconium triethanolamine complex and uses in oil field applications

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Experimental program
Comparison scheme
Effect test

Embodiment

[0043] method

[0044] Preparation of base gel

[0045] Fill the Waring mixer jar with 1 liter of distilled water. To this was added 2 g of a 50% aqueous solution of tetramethylammonium chloride clay stabilizer. Stirring was started and 3.6 g of carboxymethylhydroxypropyl guar (CMHPG) was sprayed into the vortex of the stirred solution. The pH of the resulting slurry was adjusted to 6 with sodium diacetate and stirring was continued for 30 minutes. The pH was then adjusted to 10.3 with 10% sodium hydroxide solution. Stirring was stopped and the gel was allowed to stand for 30 minutes or more before use.

[0046] Viscosity determination of zirconate-crosslinked substrate gels

[0047] To a 250 mL sample of vigorously stirred base gel in a Waring mixer jar was added 0.00032 moles of zirconium (0.2-1.0 mL, depending on the percentage of zirconium in the solution of crosslinker - hereinafter referred to as standard packing density). Stir continuously for about 15-180 seco...

Embodiment 1

[0054] In the 250mL flask, add 180g tetrakis (triethanolamine) zirconium ( TEAZ organozirconate available from E.I.E.I. du Pont de Nemours and Company, Wilmington, DE). Stirring was started and 20 g of water was slowly added. The mixture was heated to 80° C. and kept at this temperature for 4 hours to obtain 200 g of a pale yellow solution containing 11.9% Zr. The product is stable for at least six months.

Embodiment 2

[0056] In 250mL flask, add 167g tetrakis (triethanolamine) zirconium ( TEAZ organic zirconate). Stirring was started and 33 g of water were slowly added. The mixture was heated to 80° C. and kept at this temperature for 4 hours to obtain 200 g of a pale yellow solution containing 11.0% Zr. The product is stable for at least six months.

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Abstract

A process for preparing a stable zirconium triethanolamine cross-linking agent comprises contacting a solution of a zirconium triethanolamine complex with water at a temperature of 50 DEG C. to 90 DEG C. at a mole ratio of triethanolamine:zirconium in the range of 3.5:5.5 and at a mole ratio of water:zirconium in the range of 20:1 to 1:1. The stable zirconium triethanolamine complex can be used in a cross-linking composition. Further disclosed are methods to use the composition in oil field applications for hydraulic fracturing and plugging of permeable zones and leaks in subterranean formations.

Description

field of invention [0001] The field of the invention is the preparation of zirconium crosslinkers and their use in crosslinked compositions for oil well fracturing and permeable zone plugging applications. The crosslinking agent is a stable zirconium-triethanolamine complex Background of the invention [0002] A technique known as hydraulic fracturing stimulates the production of oil and natural gas from an underground well (formation) in which a viscous fluid composition (fracturing fluid) containing suspended proppant (such as sand, alumina) is passed through a conduit Such as tubing or casing is introduced into an oil or gas well at a flow rate and pressure that can create, reopen and / or extend fractures in an oil or gas containing formation. The proppant is carried into the fracture by the fluid composition and prevents the formation from closing after depressurization. The fluid viscosity of the composition limits leakage of the fluid composition into the formation. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F7/00C09K8/68
CPCC07F7/006C09K8/512C09K8/685C07F7/003
Inventor D·E·普茨
Owner DORF KETAL SPECIALITY CATALYSTS
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