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Fiber reinforced polymer oilfield tubulars and method of constructing same

  • US 8,123,888 B2
  • Filed: 04/28/2009
  • Issued: 02/28/2012
  • Est. Priority Date: 04/28/2009
  • Status: Expired due to Fees
First Claim
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1. A method of constructing an oilfield tubular, comprising:

  • combining a fiber material and a high temperature thermoset resin comprising bismaleimide to create a composite material, the high temperature thermoset resin having a melting temperature in an uncured state at which temperature the high temperature thermoset resin liquefies sufficiently for forming;

    forming the composite material into a structure by winding the composite material around a mandrel while applying sufficient heat to the composite material at the point of winding to maintain the high temperature thermoset resin above its melting temperature; and

    heat curing the composite material to complete the oilfield tubular, wherein the heat curing process comprises;

    a pre-cure step consisting of exposing the composite material to a temperature of 300°

    F., increasing the temperature to 350°

    F. at a uniform rate of 5°

    F. per minute over a period of 10 minutes, holding the temperature at 350°

    F. for a period of 30 minutes, and decreasing the temperature to ambient at a uniform rate of 5°

    F. per minute or less;

    a main cure step consisting of raising the temperature of the composite material from ambient to 400°

    F. at a uniform rate of 5°

    F. per minute for 64 minutes, holding the temperature at 400°

    F. for a period of 120 minutes, and decreasing the temperature to ambient at a uniform rate of 5°

    F. per minute or less; and

    a post-cure step consisting of raising the temperature of the composite material from ambient to 482°

    F. at a uniform rate of 5°

    F. per minute, holding the temperature at 482°

    F. for a period of 360 minutes, and decreasing the temperature to ambient at a uniform rate of 5°

    F. per minute or less.

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