High pressure, high temperature standoff for electrical connector in an underground well
View Patent ↗A standoff for providing a fluid-tight seal for an electrical connection in a well between an electrical conductor extending from down hole of the well and a power source conductor extending from an above-ground power source is enclosed by and extends through and further into the wellbore. The power source conductor extends down hole to a connector for connecting the power source conductor to the electrical conductor. The standoff includes a rigid tube adapted to extend through a wellhead barrier of the well and terminate at a lower end. A rubber boot surrounds the rigid tube. An electrical insulative tubular body has a hole forming a first inner surface surrounding the power source cable between the lower end of the rigid tube and the connector, the rubber boot surrounding the tubular body. A sleeve is placed at one end of the tubular body and has a second, larger hole coaxial with the first hole and forming a second inner surface. An internal surface is formed between the first and second inner surfaces, the lip surrounding a portion of the rigid tube adjacent the lower end and the internal shoulder engages the lower end of the rigid tube for preventing the rubber boot from extruding between the tubular body and the rigid tube when pressurized and evenly distributing the compressive force on the end of the standoff. On the other end of the standoff, a washer sits atop the electrical connector and supports the insulation.
1. A high-temperature, high-pressure standoff for providing a fluid-tight seal for an electrical connection in a well between an electrical conductor extending from down hole of the well and a power source conductor extending from an above-ground power source enclosed by and extending through and further into the wellbore in a rigid tube surrounding an electrical conductor and an insulating sheath over said electrical conductor terminating in a rubber boot surrounding the rigid tube, the power source conductor extending down hole to a connector socket for connecting the power source conductor to another electrical conductor, tie high-temperature, high-pressure standoff within said connector comprising:
an electrically resistive metal sleeve having a first inner surface having an inner diameter permitting the rigid tube to be inserted therein and a second inner surface having an inner diameter permitting the electrical conductor and an insulating sheath to be inserted therein and an inner shoulder between said first and second inner surfaces having a width approximating the width of the rigid tub to seat an end of the rigid tube;
an electrically insulative tubular body having a hole forming an inner surface surrounding the power source conductor between the lower end of the rigid tube and the connector, the rubber boot coaxially surrounding the tubular body and conductor; and,
an electrically resistive washer intermediate the end of the tubular body and insulating sheath and a conductor socket for connecting the conductor.
2. The high-temperature, high-pressure standoff of claim 1 , wherein said electrically insulative tubular hod is formed of a high voltage, high strength, ceramic insulator material.
3. The high-temperature, high-pressure standoff of claim 1 , wherein said electrically insulative tubular body k formed of a high voltage, high strength, ceramic insulator compound composed essentially of 99.5% Al 2 O 3 by weight.
4. The high-temperature, high-pressure standoff of claim 1 , wherein said electrically insulative tubular body is formed of a high voltage, high strength, ceramic insulator compound composed essentially of SiO 2 , 46%, MgO 17%, Al 2 O 3 16%, K 2 O 10%, B 2 O 3 7%, and F 4% (by weight).
5. The high-temperature, high pressure standoff of claim 1 wherein the electrically resistive metal sleeve is stainless steel.
6. The high-temperature, high-pressure standoff of claim 1 wherein the electrically resistive washer is stainless steel.
7. The high-temperature, high-pressure standoff of claim 1 wherein the electrically resistive metal sleeve is fabricated from a material having a conductivity of not more than 1.45 E +06 Siemens/M.
8. The high-temperature, high-pressure standoff of claim 1 wherein the electrically resistive washer is fabricated from a material having a conductivity of not more than 1.45 E +06 Siemens/M.