Moisture-resistant high strength sealing material sealed downhole electrical feedthrough and methods of making the same
A downhole electrical feedthrough package and method for making the same. The feedthrough package may include a metal shell forming a shell conduit. A metal web may be coupled to the metal shell, and the metal web may form a web conduit. A conducting pin may extend through the shell conduit and web conduit. A dielectric seal may electrically isolate the conducting pin from the metal web. The dielectric seal may be formed by a bismuth glass based dielectric sealing material system having at least two of the four components selected from Bi 2 O 3 , B 2 O 3 , MO, and optionally REO forming a bismuth glass system. MO may be selected from ZnO, BaO, TiO 2 , and Fe 2 O 3 , and their glass making pre-cursors. REO may be selected from CeO 2 , Y 2 O 3 , Sc 2 O 3 , Nd 2 O 3 , Pr 2 O 3 , and lanthanum series oxides. One or more isolators may be disposed within the shell conduit proximate to the dielectric seal and surrounding a portion of the conducting pin.
1. A downhole electrical feedthrough package, the feedthrough package comprising:
a metal shell forming a shell conduit;
a metal web coupled to the metal shell, the metal web forming a web conduit;
a conducting pin extending through the shell conduit and web conduit;
a dielectric seal electrically isolating the conducting pin from the metal web, the dielectric seal formed by a bismuth glass based dielectric sealing material system;
a first isolator disposed within the shell conduit proximate to a front side of the dielectric seal and surrounding a portion of the conducting pin; and
a second isolator disposed within the shell conduit proximate to a rear side of the dielectric seal and surrounding a portion of the conducting pin.
2. The feedthrough package of claim 1 , wherein the bismuth glass based dielectric sealing material system comprises of binary Bi 2 O 3 -MO compositions, wherein MO is selected from the group consisting of ZnO, BaO, TiO 2 , and Fe 2 O 3 , and their glass making pre-cursors.
3. The feedthrough package of claim 1 , wherein the bismuth glass based dielectric sealing material system comprises of ternary Bi 2 O 3 —B 2 O 3 -MO compositions, wherein MO is selected from the group consisting of ZnO, BaO, TiO 2 , Fe 2 O 3 , and their glass making pre-cursors.
4. The feedthrough package of claim 1 , wherein the bismuth glass based dielectric sealing material system comprises of quaternary Bi 2 O 3 —B 2 O 3 -MO-REO compositions, wherein MO is selected from the group consisting of ZnO, BaO, TiO 2 , Fe 2 O 3 , and their glass making precursors, and REO is selected from the group consisting of CeO 2 , Y 2 O 3 , Sc 2 O 3 , Nd 2 O 3 , Pr 2 O 3 , and lanthanum series oxides.
5. The feedthrough package of claim 1 , wherein B 2 O 3 is between 0 mol % to 40 mol %.
6. The feedthrough package of claim 1 , wherein REO is between 0 mol % to 15 mol %.
7. The feedthrough package of claim 1 , wherein MO is between 0 mol % to 35 mol %.
8. The feedthrough package of claim 1 , wherein Bi 2 O 3 is between 20 mol % to 60 mol %.
9. The feedthrough package of claim 1 , wherein the dielectric seal comprises a glass transition temperature of approximately from 350 degrees Celsius to 480 degrees Celsius, coefficient of thermal expansion from 8.0×10 −6 m/m·K to 12×10 −6 m/m·K, Young's modulus from 50 GPa to 65 GPa, a mass density of approximately from 5.5 g/cm 3 to about 7.0 g/cm 3 , and resistivity from 1.0×10 11 Ω-cm to 1.0×10 14 Ω-cm.