Down hole electrical connector and method for combating rapid decompression
View Patent ↗Embodiments of the present invention provide an effective seal and connector that maintain a removable mechanical and electrical connection between any two down hole power cables, despite cable movement and well pressure. The connector preferably includes a fluid seal comprised an encasing material that surrounds and/or adheres to protective tubing encapsulating an electrical cable's conductor wires. The encasing material may also surround and/or adhere to the conductive wire's insulation to prevent its outward expansion during well pressure events. The connector's fluid seal also comprises a relatively rigid connection between the connector's protective outer sleeve and the protective tubing encapsulating the conductor wire.
1. A rapid-decompression-inhibiting electrical connector sub-assembly comprising:
a protective outer sleeve;
an insulating elastomeric boot;
a bottom stop assembly providing a bushing accommodating the insertion of a protective outer tubing;
an insulated electrical conductor inserted through the protective outer tubing into the insulating elastomeric boot; and,
a fluid-impervious encasing material filling the interior space of the protective outer sleeve between the interior of the bottom stop assembly and the insulating elastomeric boot.
2. The rapid-decompression-inhibiting electrical connector sub-assembly of claim 1 further comprising a chamfered edge of the insulating elastomeric boot adjoining the fluid-impervious encasing material, compressing against an exterior of the insulated conductor inserted into the insulating elastomeric boot.
3. The rapid-decompression-inhibiting electrical connector sub-assembly of claim 1 wherein the insulating elastomeric boot comprises a male boot and a female boot.
4. The rapid-decompression-inhibiting electrical connector sub-assembly of claim 1 wherein the insulated electrical conductor is covered by a lead jacket.
5. The rapid-decompression-inhibiting electrical connector sub-assembly of claim 1 wherein the bottom stop assembly is adapted for engaging the protective outer tubing of a down hole conductor about two inches from the terminus of the protective outer tubing.
6. A decompression-resistant down hole connector comprising:
a protective outer sleeve;
a top stop assembly for receiving and engaging a first down hole electrical cable; wherein the top stop assembly, having a ferrule compressively seated against a first protective outer tubing, provides a metal to metal connection on the first protective outer tubing on the first down hole electrical cable;
a bottom stop assembly for receiving and engaging a second protective outer tubing of a second down hole electrical cable that electrically terminates with a connection to the first down hole electrical cable; wherein the bottom stop assembly is positioned at least partially within the protective outer sleeve enclosing the second protective outer tubing extending through a bushing within the bottom stop assembly into an interior of the protective outer sleeve;
at least one insulating elastomeric boot with an axial passage for supporting the terminated first and second down hole electrical cables within the protective outer sleeve; and
an epoxy filling the area between the second protective outer tubing and the protective outer sleeve, said epoxy encasing the second down hole electrical cable inserted in the insulating elastomeric boot through the bottom stop assembly.
7. The decompression-resistant down hole electrical connector of claim 6 wherein an outer edge of the at least one insulating elastomeric boot is chamfered to seal around the second electrical cable inserted into the insulating elastomeric boot upon the compression of the space-filling epoxy encasing the cable.
8. The decompression-resistant down hole electrical connector of claim 6 wherein the insulating elastomeric boot comprises a first male boot and a separate second female boot.
9. The decompression-resistant down hole connector of claim 6 wherein the first down hole electrical cable is a penetrator cable.
10. The decompression-resistant down hole connector of claim 6 wherein the second down hole electrical cable is a pump cable.
11. The decompression-resistant down hole connector of claim 6 wherein the protective outer tubing extends about two inches past the bottom stop assembly.
12. A method for providing the down hole connector of claim 6 comprising the steps of:
receiving and engaging the at least one down hole electrical cable with a protective outer sleeve, wherein the down hole electrical cable is formed with a cable at least partially encapsulated in protective tubing, extending concentrically interior to the protective outer sleeve; and,
inserting the protective tubing and electrical cable into the interior of the protective outer sleeve extending beyond the bottom stop assembly; and
encasing the electrical cable and protective tubing of the down hole electrical connector in the epoxy within the protective outer sleeve to prevent expansion and splitting of the insulation of the electrical cable;
enclosing the exposed portion of the outer surface of at least one down hole electrical cable extending concentrically from the protective tubing; and
forming the connection between the protective outer sleeve and the protective tubing of the down hole electrical cable.
13. The method of claim 12 further comprising the step of positioning a bottom stop assembly at least partially within the protective outer sleeve and adjacent to the encasing material so that the bottom stop assembly receives and engages the down hole electrical cable.