초록 ▼

An electric feedthrough unit particularly advantageous for application to a wellhead to interconnect an aboveground source of power with underground equipment comprises a tubular structure of steel, or other material having like properties of strength and resistance to distortion, and a rigid body o

An electric feedthrough unit particularly advantageous for application to a wellhead to interconnect an aboveground source of power with underground equipment comprises a tubular structure of steel, or other material having like properties of strength and resistance to distortion, and a rigid body of insulating material which is positioned within said tubular structure in a location intermediately of and spaced from its respective ends, one of which ends constitutes an upper end and the other a lower end when said electric feedthrough unit is applied to a wellhead. Electrically conductive elements are contained by and in recessed relation to the outer surface of said body of insulating material, spaced from the respective ends of said tubular structure. Said body of insulating material is interposed between said conductive elements and said housing to receive and transmit to said housing such forces and stresses and strains as are applied thereto directly, or indirectly. The arrangement provides that the connections to said conductive elements are well recessed within the limits of said body of insulating material. A flexible dielectric material which requires neither homogeneity nor perfect bonding to the parts to insure the integrity of the feedthrough unit is applied to fill the spaces within said tubular structure except for those areas where respective end portions of the electrically conductive elements must be bare for their use in connecting an aboveground source of power with below ground equipment.

대표청구항 ▼

An electric feedthrough unit particularly applicable to a wellhead to interconnect an aboveground source of power with underground equipment comprising a generally tubular structure of steel or other material having like properties of strength and resistance to distortion, a rigid body of an insulat

An electric feedthrough unit particularly applicable to a wellhead to interconnect an aboveground source of power with underground equipment comprising a generally tubular structure of steel or other material having like properties of strength and resistance to distortion, a rigid body of an insulating material having a high dielectric strength, such as alumina ceramic, positioned within said tubular structure at a location intermediately of and spaced from its respective ends, one of said ends constituting an upper end and the other a lower end when said electric feedthrough unit is applied to a wellhead for use, electrically conductive elements contained within and in recessed relation to the outer surface of said rigid body, said tubular structure having an inner wall surface including thereon means defining an annular shoulder which extends transversely of said tubular structure and is spaced from its ends, one end portion of said body being in a directly abutted relation to said shoulder which precludes said body from movement toward said upper end of said tubular structure, said body having an outer peripheral surface portion thereof in a contacting bearing relation to said inner wall surface of said tubular structure, a length of armored cable having sheathed conductive wires contained therein and extending the length thereof, at one end portion of said cable said contained wires being exposed, their respective extremities bared and each respectively connected in an electrically conductive relation to one of said elements, said cable extending from said elements and said rigid body through and from said lower end of said tubular structure, the opposite end portion of said cable being adapted for connection of said wires to deliver power to underground equipment, closure means clamped to and about said tubular structure and said cable adjacent said lower end of said tubular structure to form a chamber located between said rigid body and said closure means, said chamber being charged and filled with a flexible dielectric material, such as an epoxy which is flexible when cured, said flexible dielectric complementing and being shaped by an interior surface of said closure means and forming a seal within and across said lower end portion of said tubular structure, about and in supporting relation to the portions of said cable therein, precluding the entry to the lower end of said tubular structure and passage therethrough of fluids and operative to receive and transmit to and through said rigid body to said shoulder such forces, stresses and strains as are applied thereto, directly or indirectly, when exposed to an environment of high temperatures and pressures and highly volatile or otherwise dangerous fluid, thereby to obviate chance occurrence of dangerous and catastrophic events in use of said electric feedthrough unit.