Contact module for communicating with a downhole device
A system including a tool drill string having a downhole device. The system includes at least one external contact configured to be electrically coupled to the downhole device to communicate with the downhole device, one or more insulators that electrically insulate the at least one external contact from other parts of the system, and one or more seals situated between the one or more insulators and the at least one external contact to pressure seal the system from external fluids.
1. A downhole tool, comprising:
a spear point assembly comprising an axis, an end shaft having a distal end configured to be coupled to a downhole device, a central shaft extending axially from the end shaft, a latch rod threadingly coupled to a proximal end of the central shafts;
electrical contacts and insulators located on an exterior of the central shaft, such that the central shaft extends through the electrical contacts and insulators and into the latch rod, the electrical contacts are configured to be electrically coupled to the downhole device, and electrically coupled with a surface connector in a slidable axial direction,
each of the end shaft, electrical contacts, insulators, and latch rod comprise axial faces, and physical contact between the electrical contacts, insulators, end shaft and latch rod consists of contact between the respective axial faces thereof;
seal apertures located only in the axial faces of the end shaft, electrical contacts and latch rod, such that the insulators are free of seal apertures;
o-ring seals positioned exclusively in the seal apertures in the axial faces of the electrical contacts, end shaft and latch rod; and
the latch rod comprises a spear tip nose at a distal end thereof configured to stab into a female receptacle in a overshot tool to carry an entire weight of the spear point assembly and the downhole device at the spear tip nose to be retrieved from a well, such that an entire tensile load connection and capacity of the spear point assembly consists of the spear tip nose.
2. The downhole tool of claim 1 , wherein the electrical contacts are electrically insulated from each other and from the end shaft and latch rod by the insulators.
3. The downhole tool of claim 1 , wherein each of the electrical contacts is an annular metal ring that completely circumscribes the central shaft, and each of the insulators is an annular ceramic ring that completely circumscribes the central shaft.
4. The downhole tool of claim 1 , further comprising semicircular electrical insulators located between the electrical contacts, respectively, and the central shaft.
5. The downhole tool of claim 1 , wherein the electrical contacts are electrically coupled to a communications path with electrical connectors, respectively, via fasteners.
6. The downhole tool of claim 5 , wherein the communications path is connected to the end shaft via a strain relief.
7. The downhole tool of claim 5 , wherein the central shaft comprises a connections slot for connecting the electrical connectors to the communications path.
8. The downhole tool of claim 5 , wherein the central shaft comprises a key slot having a key that engages and limits the electrical contacts from rotation relative to the axis and the end shaft.
9. A downhole tool, comprising:
a spear point assembly comprising an axis, an end shaft having a distal end configured to be coupled to a downhole device, a central shaft extending axially from the end shaft, a latch rod threadingly coupled to a distal end of the central shaft, electrical contacts and insulators located on an exterior of the central shaft, such that the central shaft extends through the electrical contacts and insulators and into the latch rod, the electrical contacts are configured to be electrically coupled to the downhole device, and electrically coupled with a surface connector in a slidable axial direction, and the electrical contacts are electrically insulated from each other and from the end shaft and latch rod by the insulators;
each of the end shaft, electrical contacts, insulators, and latch rod comprise axial faces, and physical contact between the electrical contacts, insulators, end shaft and latch rod consists of contact between the respective axial faces thereof;
seal apertures located only in the axial faces of the end shaft, electrical contacts and latch rod, such that the insulators are free of seal apertures;
o-ring seals positioned exclusively in the seal apertures in the axial faces of the electrical contacts, end shaft and latch rod; and
the latch rod comprises a spear tip nose at a proximal end thereof configured to stab into a female receptacle in a overshot tool to carry an entire weight of the spear point assembly and the downhole device at the spear tip nose to be retrieved from a well, such that an entire tensile load connection and capacity of the spear point assembly consists of the spear tip nose.
10. The downhole tool of claim 9 , wherein each of the electrical contacts is an annular metal ring that completely circumscribes the central shaft, and each of the insulators is an annular ceramic ring that completely circumscribes the central shaft.
11. The downhole tool of claim 9 , further comprising semicircular electrical insulators located between the electrical contacts, respectively, and the central shaft.
12. The downhole tool of claim 9 , wherein the electrical contacts are electrically coupled to a communications path with electrical connectors, via fasteners;
the central shaft comprises a connections slot to connect the electrical connectors to the communications path; and
the central shaft comprises a key slot having a key that engages and limits the electrical contacts from rotation relative to the axis and the end shaft.
13. A downhole tool, comprising:
a spear point assembly comprising an axis, an end shaft having a distal end configured to be coupled to a downhole device, a central shaft extending axially from the end shaft, a latch rod threadingly coupled to a distal end of the central shaft, electrical contacts and insulators located on an exterior of the central shaft, such that the central shaft extends through the electrical contacts and insulators and into the latch rod, the electrical contacts are configured to be electrically coupled to the downhole device, and electrically coupled with a surface connector in a slidable axial direction,
each of the end shaft, electrical contacts, insulators, and latch rod comprise axial faces, and physical contact between the electrical contacts, insulators, end shaft and latch rod consists of contact between the respective axial faces thereof;
seal apertures located only in the axial faces of the end shaft, electrical contacts and latch rod, such that the insulators are free of seal apertures;
o-ring seals positioned exclusively in the seal apertures in the axial faces of the electrical contacts, end shaft and latch rod;
the electrical contacts are electrically coupled to a communications path with electrical connectors, respectively, via fasteners;
the central shaft comprises a key slot having a key that engages and limit the electrical contacts from rotation relative to the axis and the end shaft; and
the latch rod comprises a spear tip nose at a proximal end thereof configured to stab into a female receptacle in a overshot tool to carry an entire weight of the spear point assembly and the downhole device at the spear tip nose to be retrieved from a well, such that an entire tensile load connection and capacity of the spear point assembly consists of the spear tip nose.
14. The downhole tool of claim 13 , wherein each of the electrical contacts is an annular metal ring that completely circumscribes the central shaft, and each of the insulators is an annular ceramic ring that completely circumscribes the central shaft.
15. The downhole tool of claim 13 , wherein the communications path is connected to the end shaft via a strain relief; and
the central shaft comprises a connections slot for connections of the electrical connectors to the communications path.