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Prevention, actuation and control of deployment of memory-shape polymer foam-based expandables

A technology of polymers and copolymers, applied in wellbore/well components, machines/engines, mechanisms for generating mechanical power, etc.

Active Publication Date: 2012-12-26
BAKER HUGHES HLDG LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Prevention, actuation and control of deployment of memory-shape polymer foam-based expandables
  • Prevention, actuation and control of deployment of memory-shape polymer foam-based expandables
  • Prevention, actuation and control of deployment of memory-shape polymer foam-based expandables

Examples

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Embodiment 1

[0044] attached Figure 5 The effect of polar and non-polar deployment fluids on shape memory polymer foam based expandables is shown. Two cylindrical samples of polyurethane-polycarbonate rigid open-cell foam (h=4mm, d=7mm) were immersed in vegetable oil and water at 65°C and compressed to 35.2% and 39.4% of their original height, respectively. After removing the compressive load on the sample, the sample immersed in vegetable oil expanded to 39.9% of its original height in 21 seconds, and then further expanded to only 40.9% of its original height in 2468 minutes after that, while the immersed The sample in water rapidly expanded to 50.8% of its original height within 62 seconds, and then further gradually expanded to 67.2% of its original height over the next 2500 minutes. Note that the initial rapid expansion of the foam samples reflects the elastic response of the foam to removal of the compressive load and could have been avoided if the pre-compressed samples were immers...

Embodiment 2

[0046] In the specific case of polycarbonate-polyurethane shape memory foam materials, it is believed that relatively light and mobile water molecules are linked to the negatively charged oxygen atoms and carbamate (urethane) of the polycarbonate chains. The positively charged hydrogen atoms form hydrogen bonds, which cause them to move and, as discussed previously, potentially act as "internal lubricants" between polymer chains. A comprehensive molecular level understanding of water molecules and polymer interactions is provided in Molecular Dynamics simulations (described by Tamar Schlick in "Molecular Modeling and Simulation", Springer-Verlag, New York, 2002).

[0047] attached Figure 6 As can be seen in , this phenomenon effectively reduces the glass transition temperature Tg of polyurethane / polycarbonate foam immersed in water by a ΔTg of about -17°C compared to the Tg of the same material immersed in vegetable oil. attached Figure 6 is a plot of storage modulus (E') ...

Embodiment 3

[0050] as attached Figure 7 As shown in , by varying the temperature of the circulating fluid, it is possible to simultaneously control the speed and extent of deployment of shape-memory polymer foam-based expandables. as attached Figure 7 As shown in , increasing temperature increases the speed and extent of expandable deployment. It should be noted that this effect holds true for foams submerged in both more polar deployment fluids and non-polar deployment fluids.

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Abstract

Actuation and control of the deployment of a polymeric memory-shape material on a wellbore device on a downhole tool may be accomplished by treating a compacted or compressed polymeric memory-shape material with a deployment fluid to lower its Tg and / or decrease its rigidity, thereby softening the polymeric shape-memory material at a given temperature and triggering its expansion or recovery at a lower temperature. Alternatively, the deployment of the compacted or compressed polymeric memory-shape material may be prevented or inhibited by shielding the material with an environment of a fluid that does not substantially lower its Tg, decrease its rigidity or both, and then subsequently contacting the material with a deployment fluid.

Description

technical field [0001] The present invention relates to devices for oil and gas wellbores employing shape memory materials that remain in an altered geometric state during run-in; once the device is in place downhole and at a given volume Exposed to a given temperature for a period of time, the devices attempt to return to their original geometric positions before changing. More particularly, the present invention relates to devices in which the Tg and / or its stiffness are reduced through the use of a deployment fluid. Background technique [0002] Different methods of filtration, wellbore isolation, production control, wellbore life cycle management and wellbore construction are known in the art. The use of shape memory materials in these applications has been disclosed for oil and gas development. Shape memory materials are smart materials that have the ability to return to their original (permanent) shape from a deformed or compressed state (temporary state) caused by a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/08C08G18/28C08L75/04E21B33/12
CPCC08G2101/0025B29K2075/00C08G2280/00B29C61/00E21B41/00E21B23/00F03G7/065C08G18/44E21B33/1208E21B33/1277E21B33/134E21B43/08E21B43/105E21B43/108Y10T29/49826C08G2110/0025
Inventor M·约翰逊O·A·马兹雅
Owner BAKER HUGHES HLDG LLC
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