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Viscosified treatment fluids comprising scleroglucan or diutan and associated methods

a treatment fluid and scleroglucan technology, applied in the direction of fluid removal, wellbore/well accessories, construction, etc., can solve the problems of xanthan treatment fluids that may not be suitable gelling agents for viscosification treatment fluids, sand suspension properties of such xanthan treatment fluids are diminished, etc., to reduce the viscosity of the viscosified gravel pack fluid and the effect of reducing the viscosity of the viscos

Inactive Publication Date: 2005-11-24
HALLIBURTON ENERGY SERVICES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to viscosified treatment fluids used in industrial and oil field operations. The invention provides a method of reducing the viscosity of a viscosified treatment fluid comprising a gelling agent that comprises diutan or scleroglucan using a breaker that comprises a peroxide. The invention also provides a method of making a viscosified treatment fluid comprising diutan or scleroglucan by dissolving the gelling agent in an aqueous fluid and contacting the fluid with a breaker that comprises a peroxide. The invention also provides a method of fracturing a portion of a subterranean formation using a viscosified fracturing fluid comprising a gelling agent that comprises diutan or scleroglucan. The invention also provides a method of producing hydrocarbons from a subterranean formation using a viscosified treatment fluid comprising a gelling agent that comprises diutan or scleroglucan. The invention also provides a subterranean well treatment system comprising a viscosified treatment fluid that comprises diutan or scleroglucan.

Problems solved by technology

), however, the sand suspension properties of such xanthan treatment fluids are diminished.
Consequently, xanthan may not be a suitable gelling agent for viscosified treatment fluids, such as fracturing fluid or gravel pack fluids, when those fluids are used in well bores that comprise elevated temperatures.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples

[0050] Solutions of diutan in water at room temperature show an elastic rheological modulus (G′) of 15 Pa at 0.5%, while at 0.75% G′ is 33 Pa. Sand suspension tests at 220° F. show that the diutan viscosified treatment fluid suspends sand for at least 2 hours. Thus, a viscosified treatment fluid of the present invention comprising diutan is satisfactory for suspending particulates such as proppant or gravel that may be used in subterranean operations.

[0051] To illustrate, inter alia, the breaking characteristics of diutan with various oxidizing and breaking agents (referred to as “breakers” below), the following tests were performed. “GEOVIS XT” (commercially available from Kelco Oil Field Group, Houston, Tex.) was the source of the diutan polymers used in these examples.

[0052] Sodium persulfate at about 1 pound to about 1000 gallons is well known to effectively degrade guar and guar derivatives at temperatures above about 135° F. Various concentrations of sodium persulfate breake...

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Abstract

The present invention relates to viscosified treatment fluids comprising gelling agents that comprise scleroglucan or diutan, and their use in industrial and oil field operations. In certain embodiments, the present invention provides methods of treating a portion of a subterranean formation with a viscosified treatment comprising a gelling agent that comprises scleroglucan or diutan. Methods of fracturing, gravel packing, and producing hydrocarbons also are provided. Viscosified treatment fluid compositions and methods of making such exemplary compositions are provided as well.

Description

BACKGROUND OF THE INVENTION [0001] The present invention relates to viscosified treatment fluids used in industrial and oil field operations, and more particularly, to viscosified treatment fluids comprising gelling agents that comprise scleroglucan or diutan, and their use in industrial and oil field operations. [0002] In industrial and oil field operation, viscosified treatment fluids are often used to carry particulates into subterranean formations for various purposes, e.g., to deliver particulates to a desired location within a well bore. Examples of subterranean operations that use such viscosified treatment fluids include servicing and completion operations such as fracturing and gravel packing. In fracturing, generally, a viscosified fracturing fluid is used to carry proppant to fractures within the formation, inter alia, to maintain the integrity of those fractures to enhance the flow of desirable fluids to a well bore. In sand control operations such as gravel packing oper...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09K8/68C09K8/70C09K8/90E21BE21B43/00E21B43/04E21B43/22E21B43/25E21B43/26
CPCC09K8/68C09K8/685C09K2208/26C09K8/905C09K8/706
Inventor ROBB, IAN D.PAULS, RICHARD
Owner HALLIBURTON ENERGY SERVICES INC
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