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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: 2013-09-11
BAKER HUGHES HLDG LLC
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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

Examples

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Embodiment

[0037] Laboratory viscosity and fluid leakage tests have shown that the solvent-soluble particles herein for VES-gelled aqueous fluids can increase viscosity and reduce fluid loss. The previous core flow test conducted in US Patent 6,994,166 showed that after the solid was dissolved by a solvent, the solid did not cause damage.

[0038] In the examples herein, two different dicarboxylic acid particles were used. LCA140 is a mixture of dodecanedioic acid, undecanedioic acid, sebacic acid (decanedioic acid), azelaic acid and suberic acid (Reagent A in U.S. 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. The particle sizes of LCA140 and LCA141 are both 120 mesh to 60 mesh (126 microns to 250 microns). The properties of LCA140 particles and LCA141 particles are shown in Table I, and their solubility is shown in Table II.

[0039] Table I Properties of dicarboxylic a...

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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 agents may include, but not be limited to, dodecanedioic acid, undecanedioic acid, decanedioic acid, azelaic 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 a 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 viscoelastic surfactant treating fluid.

Description

Technical field [0001] The present invention relates to aqueous viscoelastic fluids used in hydrocarbon recovery operations and, in a non-limiting embodiment, more specifically relates to methods and additives for increasing the viscosity of these fluids and / or for controlling fluid loss. Background technique [0002] Hydraulic fracturing is a method that uses sufficient pumping rate and effective water pressure to break or fragment underground formations. Once a breach or multiple breaches are formed, a proppant with high permeability relative to the formation permeability is pumped into the breach to support the opening of the breach. When the applied pumping rate and pressure are reduced or removed from the formation, the breach or rupture will not close or be completely repaired because the high permeability proppant keeps the breach open. Supported rifts or ruptures provide a high-permeability channel connecting the production and eye to the larger formation area to enhance...

Claims

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Application Information

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