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Fluid loss control in viscoelastic surfactant fracturing fluids using water soluble polymers

A surfactant and viscoelastic technology, applied in the field of aqueous viscoelastic fluid, can solve the problems of increasing the risk of slurry dehydration and premature screening, increasing the risk of formation damage, increasing fluid volume, etc.

Inactive Publication Date: 2014-05-07
BAKER HUGHES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fluid loss to the formation during frac pack and hydraulic fracturing operations increases the risk of slurry dewatering and premature screening, increases the risk of formation damage, increases fluid incompatibility with formation fluids (e.g. emulsions) risk, increase the volume of fluid required to accomplish the process, and / or result in increased hydraulic horsepower requirements

Method used

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  • Fluid loss control in viscoelastic surfactant fracturing fluids using water soluble polymers
  • Fluid loss control in viscoelastic surfactant fracturing fluids using water soluble polymers
  • Fluid loss control in viscoelastic surfactant fracturing fluids using water soluble polymers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0055] In addition to the data given above, the fluids described in Table II were also tested.

[0056] The composition of table II embodiment 1-3

[0057]

[0058] figure 1 is a graph representing the results of a leak test of three fluids each treated at 150°F (66°C) for 30 minutes. It can be seen that the fluids of Examples 2 and 3 produced a much lower volume of fluid leakage than the control fluid of Example 1 which did not contain the uncrosslinked polymer FLA.

[0059] figure 2 is a graph representing the results of leakage coefficients for the three fluids of Table II. The wall-building leakage coefficient (Cw) of the fluids of Examples 2 and 3 of the present invention is much lower than the controlled leakage coefficient (Cv) of the fluid of Comparative Example 1. Vsp is the initial influx of fluid into the formation as the original fracture face is exposed during the fracture pack treatment and before the polymer FLA acts to slow fluid loss. The lower the Vs...

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Abstract

Water soluble uncrosslinked polysaccharides may be fluid loss control agents for viscoelastic surfactant (VES) fluids used for stimulation (e.g. fracturing) or well completion in hydrocarbon recovery operations. The VES fluid may further include proppant or gravel, if it is intended for use as a fracturing fluid or a gravel packing fluid, although such uses do not require that the fluid contain proppant or gravel. The water soluble uncrosslinked polysac not charide fluid loss control agents may include, but not be limited to guar gum and derivatives thereof; cellulose and derivatives thereof; propylene glycol alginate; salts (e.g. sodium, potassium, and calcium salts) of iota, kappa, and lambda carrageenan; agar-agar; xanthan gum; and the like; and / or mixtures thereof. The fluid loss control agent may be added to the aqueous viscoelastic treating fluid prior to VES addition, and / or at the same time and / or after the VES is added.

Description

technical field [0001] The present invention relates to aqueous viscoelastic fluids used during hydrocarbon recovery operations, and more particularly, in one non-limiting embodiment, to methods and additives for controlling fluid loss thereof. Background of the invention [0002] Hydraulic fracturing is a method that uses pump speed and hydraulic pressure to fracture, or rupture, underground formations. Once one or more fractures are created, a proppant that is highly permeable relative to the permeability of the formation is pumped into the fractures to prop the fractures open. When the applied pump rate and pressure is reduced or removed from the formation, the crack or fracture does not fully close or heal due to the high permeability proppant keeping the crack open. The propped cracks or fractures provide high permeability pathways that connect the production wellbore to a larger formation region for increased hydrocarbon production. [0003] Developing a suitable fra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/50C09K8/508C09K8/514
CPCC09K8/602C09K8/506C09K8/68C09K8/88C09K2208/30C09K8/514C09K8/665C09K8/90C09K8/905C09K2208/26E21B33/13E21B43/26
Inventor W·R·伍德
Owner BAKER HUGHES INC
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