Gelled emulsions and methods of using the same

a gelled emulsion and gel technology, applied in the field of gelled emulsions, can solve the problems of reducing affecting the so as to reduce the initial viscosity of the gelled emulsion

Inactive Publication Date: 2008-09-11
BAKER HUGHES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012]Additives and mixing methodology may be employed in order to delay the hydration of the polymeric viscosifying agent. As such, the initial viscosity of the gelled emulsion may be minimized; the viscosity of the emulsion being allowed to increase over time. This, in turn, minimizes pumping friction pressure.
[0013]The aqueous water-soluble solvent solution may consist of an organic solvent ...

Problems solved by technology

In the case of methanol, it is also very volatile and will therefore evaporate even in the presence of water saturated gases.
Glycol, however, is more costly than methanol and exhibits lower volatility.
The disclosed emulsions are further undesirable since, at elevated temperatures and pressures, hydrocarbons (such as kerosene and diesel fuel) become miscible and a low viscosity, single phase liquid results.
Concerns have arisen, however, regarding residual phosphorous compounds (which may remain in the crude and cause refinery upse...

Method used

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  • Gelled emulsions and methods of using the same
  • Gelled emulsions and methods of using the same
  • Gelled emulsions and methods of using the same

Examples

Experimental program
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example 1

[0083]An emulsion, not containing a breaker, was prepared by making a base gel containing 60 vol % methanol in water to which was added 2 L / m3 acetic acid (60%), 2 L / m3 of a 60% choline chloride solution (a temporary clay stabilizer which avoids the swelling of the clay), 8 kg GM-55 methanol gellant and 20 l / m3 CSA-40 / 70. The acetic acid was used as a buffer to ensure hydration of the GM-55 gellant. One volume of this solvent blend was then emulsified with 3 volumes of Fracsol. The viscosity was then measured on a Brookfield Model PVS high pressure rheometer equipped with a B5 bob. The results are graphically displayed in FIG. 1.

example 2

[0084]An emulsion was prepared as set forth in Example 1 except that the concentration of gellant was varied. The results are graphically displayed in FIG. 2.

example 3

[0085]An emulsion was prepared as set forth in Example 1 except that the concentration of gellant was 3 kg / m3 and the concentration of emulsifying agent was varied. FIG. 3 illustrates the effect of emulsifier concentration on viscosity of the gelled emulsion.

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Abstract

Gelled emulsions contain (i.) an external phase of an aqueous water-soluble solvent solution, polymeric viscosifying agent and, optionally, an oxidative and/or acidic breaker; and (ii.) an internal phase of a dispersed organic fluid. The aqueous water-soluble solvent solution constitutes between from about 15 to about 50 volume percent of the gelled emulsion and the dispersed organic fluid is presented in the gelled emulsion in amounts ranging from about 50 to about 85 volume percent. The gelled emulsions are useful in a variety of applications including, but not limited to, oil field, pipeline and processing facility applications.

Description

FIELD OF THE INVENTION[0001]The invention relates to gelled emulsions which contain an aqueous water-soluble solvent solution. The gelled emulsions are essentially phosphate-free. The invention further relates to methods of using such gelled emulsions.BACKGROUND OF THE INVENTION[0002]Stimulation techniques, such as hydraulic fracturing, used in the treatment of oil and gas wells improve productivity of the treated well. In hydraulic fracturing, a fluid is injected down the wellbore and into the productive formation at a sufficient rate and pressure such that the formation rock fractures from the induced stresses. A proppant is added to the fluid and is carried into the formation fracture. The proppant prevents closure of the fracture when hydraulic pressures are released, thereby leaving a conductive flow channel from the wellbore deep into the rock matrix.[0003]Traditionally the fluid used for the purpose of hydraulic fracturing has been oil, water, or an emulsion of these two liqu...

Claims

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Application Information

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IPC IPC(8): E21B43/16C09K23/00
CPCC09K2208/26C09K8/703
Inventor DELOREY, JOHN ROLANDRIEB, BRAD
Owner BAKER HUGHES INC
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