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Removal of crystallinity in guar based materials and related methods of hydration & subterranean applications

A guar gum, crystallization technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as incomplete removal of water

Inactive Publication Date: 2011-11-23
PRAD RES & DEV LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Water is usually gradually driven out of the system as the process continues, but water is usually not completely removed

Method used

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  • Removal of crystallinity in guar based materials and related methods of hydration & subterranean applications
  • Removal of crystallinity in guar based materials and related methods of hydration & subterranean applications
  • Removal of crystallinity in guar based materials and related methods of hydration & subterranean applications

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Experimental program
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Embodiment 1

[0041] Of all the polymers examined, guar gum was found to be the most difficult to hydrate. under the microscope, as figure 1 As shown in , guar gum exhibits the degree of crystallinity shown in the lower part of (A). Even when in contact with water, the crystalline structure is not easily destroyed, as shown in the upper part of (A), where water has soaked the guar particles, but fragments of the guar particles can be seen. The guar gum particles will maintain its microdomains without completely dissolving in water.

[0042] exist figure 1 In, A and B are microscopic images of guar gum when in contact with water. (A) Guar powder dried (bottom) and partially exposed to water. (B) Guar gum in water in water emulsion with PEG8000, polyethylene glycol.

[0043] Closer examination of guar gum under a microscope reveals that its hydration begins with the rapid untwisting of initially twisted guar particles into a flat layered structure. The layers then swell rapidly, followe...

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Abstract

Methods which include hydrating a crystalline polymeric material in a first liquid medium, precipitating the polymeric material to form an amorphous polymeric material, and combining amorphous polymeric material with a second liquid medium to form a treatment fluid. Alternative methods include hydrating a crystalline polymeric material in a first liquid medium, precipitating the polymeric material to form a lower crystalline form of the polymeric material, and combining the lower crystalline form of polymeric material with a second liquid medium to form a treatment fluid.

Description

Background technique [0001] The statements in this section merely provide background information related to the disclosure and may not constitute prior art. [0002] Embodiments relate to compositions and methods for treating subterranean formations, in particular, oilfield stimulation compositions and methods of using gelling agents that are substantially free of crystallization. [0003] Guar molecules are known to be able to crystallize into several crystal forms using different amounts of water and under different crystallization methods. For example, when producing pulverized guar gum, guar pieces are soaked in water to swell. Grind the swollen guar chips into smaller pieces. Swollen guar gum is softer and allows easy grinding without major damage to the polymer chains. The smaller pieces are then ground and simultaneously dried to even smaller pieces until finally they are a powder. Water is usually gradually driven out of the system as the process continues, but is ...

Claims

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Application Information

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IPC IPC(8): C09K8/68C09K8/00C08B37/00C08B37/14C08L5/00
CPCC08L5/00C08B37/0096C09K8/685C09K8/00C08B37/146C08L71/02
Inventor 陈贻研
Owner PRAD RES & DEV LTD
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