High-strength anti-collapsing petroleum casing column and manufacturing method thereof

High-strength anti-collapsing petroleum casing column and manufacturing method thereof

  • CN 102,296,239 B
  • Filed: 06/25/2010
  • Issued: 08/20/2014
  • Est. Priority Date: 06/25/2010
  • Status: Active Grant
First Claim
Patent Images

1. a high-strength anti-collapsing petroleum casing column, is characterized in that, its chemical element quality per distribution ratio is:

  • C;

    0.24~

    0.30%;

    Mn;

    0.9~

    1.3%;

    Si;

    0.25~

    0.50%;

    Cr;

    0.9~

    1.3%;

    Mo;

    0.6~

    0.8%;

    V;

    0.06~

    0.10%;

    Al;

    0.01~

    0.03%;

    Nb;

    0.02~

    0.05%;

    Zr;

    0~

    0.03%;

    B<

    0.004%;

    Ti<

    0.03%;

    P<

    0.015%;

    S<

    0.010%;

    Ca;

    0.001~

    0.006%;

    Surplus is Fe and other inevitable impurity;

    And meet Ca/S >

    1;

    The outside dimension of described tubing string is φ

    141.3mm~

    φ

    142.7mm;

    The wall thickness of described tubing string is 10.7mm~

    12.9mm;

    The yield strength of described tubing string is 1034~

    1206MPa;

    The anti-ability of ruining of squeezing of described tubing string is not less than 168MPa.2. high-strength anti-collapsing petroleum casing column claimed in claim 1, is characterized in that;

    the buckle-shaped of described tubing string is oval screw thread.3. the manufacture method of high-strength anti-collapsing petroleum casing column as claimed in claim 2, is characterized in that, comprises the following steps;

    (1) molten steel is carried out to external refining and become circle base with continuous casting after vacuum outgas;

    (2) bore a hole after justifying base soaking;

    (3) carry out tube rolling, roll rear air cooling and carry out sawing, controlling sleeve pipe tubing string tissue is all bainite structure, or control sleeve pipe tubing string is organized as ferrite+perlite+bainite structure;

    (4) sleeve pipe tubing string is carried out to modifier treatment;

    quenching temperature is 880~

    930 ℃

    , soaking time is 30~

    60min, then shrend, and 590~

    650 ℃

    are carried out high tempering, and soaking time is 30~

    80min;

    (5) sleeve pipe tubing string is carried out to hot size and hot straightening, controlling hot size temperature is 570~

    640 ℃

    , 500~

    550 ℃

    of hot straightening temperature, and the out of roundness of controlling sleeve pipe tubing string is less than 0.4%, and inhomogeneity of wall thickness rate is less than 12%.

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