A short sub assembly used to enable two components with different thread types or sizes to be connected. Also it can be used to protect other tooling in drill stem (called saver sub) or be used to deliver outgoing air to the bit face just above the bit (called bit sub). Orchid Energy Co can supply crossover subs come in three basic types: A Pin (male) * Box (female); B Pin (male) * Pin (male); C Box (female) * Box (female).
The length of crossover subs is generally measured from shoulder to shoulder. Typical lengths range from 6" - 28" long going up in increments of 2 inches with AISI 4145H, AISI 4145H Mod or Non-magnetic material according to API 7-1. All connections are phosphate-coated or copper plated to improve resistance to corrosion.
Designed to run immediately above or below the bottom hole assembly (BHA), activation is accomplished by dropping a chrome steel ball from surface and applying pressure. This causes a pin in the sub to shear allowing the sleeve to drop from its primary position to its secondary position, opening three sub ports which divert the flow to the annulus.
Used to extend the life of the drill stem component it is made up to, by taking the wear. The saver sub connection is sacrificed because it can be easily repaired or inexpensively replaced.
|Description||Upper Connection Part||Lower Connection Part||Type|
|Kelly cross-over sub||Kelly||Drill pipe||A or B|
|Drill pipe cross-over sub||Drill pipe||Drill pipe||A or B|
|Interim cross-over sub||Drill pipe||Drill collar||A or B|
|Drill collar cross-over sub||Drill collar||Drill collar||A or B|
|Drill bit cross-over sub||Drill collar||Drill bit||A or B|
|Swivel cross-over sub||Swivel lower sub||Kelly||C|
|Fishing cross-over sub||Kelly||Drill pipe||C|
|Drill pipe||Fishing tools||C|
|Crossover sub could be customized as per customer's design.|