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Mutual solvent-soluble and/or alcohol blends-soluble particles for viscoelastic surfactant fluids

A surfactant and viscoelastic technology, applied in the field of water-based viscoelastic fluid, can solve problems such as fluid leakage and reduced fluid efficacy

Inactive Publication Date: 2011-04-27
BAKER HUGHES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the same properties that make VES fluids less damaging tend to result in much higher fluid leakage into the reservoir bedrock, which reduces fluid effectiveness especially during VES fragmentation processing

Method used

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  • Mutual solvent-soluble and/or alcohol blends-soluble particles for viscoelastic surfactant fluids
  • Mutual solvent-soluble and/or alcohol blends-soluble particles for viscoelastic surfactant fluids
  • Mutual solvent-soluble and/or alcohol blends-soluble particles for viscoelastic surfactant fluids

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Embodiment

[0037] Laboratory viscosity and fluid leakage tests show that the solvent-soluble particles herein can increase viscosity and reduce fluid loss for VES-gelled aqueous fluids. Previous core flow tests in US Patent 6,994,166 showed that the solids did not cause damage after they were dissolved by a solvent.

[0038] Two different dicarboxylic acid particles were used in the examples herein. LCA140 is a mixture of dodecanedioic acid, undecanedioic acid, sebacic acid (decanedioic acid), azelaic acid, and suberic acid (Reagent A in US Patent 6,994,166), which is CORFREE from INVISTA Intermediates M1 product. LCA141 is dodecanedioic acid (DDDA) (Reagent B in US Patent 6,994,166), also from INVISTA. Both LCA140 and LCA141 have a particle size of 120 mesh to 60 mesh (126 microns to 250 microns). The properties of LCA140 particles and LCA141 particles are shown in Table I, while their solubility is shown in Table II.

[0039] Table I Properties of Dicarboxylic Acid Reagents

[004...

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Abstract

Solid, particulate dicarboxylic acids may be fluid loss control agents and / or viscosifying agents for viscoelastic surfactant (VES) fluids in treatments such as well completion or stimulation in hydrocarbon recovery operations. The fluid loss control agenls may include, but not be limited to, dodecanedioic acid, undecanedioic acid, decanedioic acid, azalaic acid, suberic acid, and mixtures thereof having a mesh size of from about 20 mesh to about 400 mesh (about 841 to about 38 microns). A mutual solvent or blend of at least two alcohols subsequently added to the aqueous viscoelastic surfactant treating fluid will at least partially dissolve the solid, particulate dicarboxylic acid fluid loss control agents, and optionally also ''break'' or reduce the viscosity of the aqueous viscoelasticsurfactant treating fluid.

Description

technical field [0001] The present invention relates to aqueous viscoelastic fluids used during hydrocarbon recovery operations, and more particularly, in a non-limiting embodiment, to methods and additives for increasing the viscosity of these fluids and / or for controlling fluid loss thereof. Background technique [0002] Hydrofracturing is a method that uses sufficient pumping rates and effective water pressure to break up or fragment subterranean formations. Once a fracture or fractures have formed, a proppant that is highly permeable relative to the permeability of the formation is pumped into the fracture to prop open the fracture. When the applied pumping rate and pressure is reduced or removed from the formation, the breach or rupture does not close or heal completely because the highly permeable proppant keeps the fracture open. Propped fractures or fractures provide highly permeable pathways connecting production wells to larger formation areas to enhance hydrocarb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68E21B43/27
CPCC09K8/68C09K2208/30C09K8/70C09K8/74C09K8/602E21B43/26
Inventor T·黄
Owner BAKER HUGHES INC