Incident Handling Tools
The safety joint is a special joint.
It is suitable for handling downhole accidents, as well as for drilling, coring and midway testing.
Safety joint is one kind of downhole work safety equipment for fishing,washover and testing. Which could connect with needed parts in downhole and could bear various tension and compression load and transmit torque in the operation. It is easy to back off once the safety joint is needed,so that convenience to disassemble its upper drill stem. It is also easy to connect to work when running in downhole again.
Back off sub:
Back off sub is also called back off spear. It can replace the taper tap,fishing or back off when dealing with sticking. If the fish is stuck or cannot be back off,it can release from the back off sub,and then trip the drilling tool.
Impression block is used for determining the depth of fish and configuration of the top of fish,it can enable the operator to know the configuration of the top of fish and position in the well bore,then select proper fishing tool to catch successfully.
Multi-cycle circulating sub:
Multi-cycle circulating sub is a sub which can proviod multiple open and close the circulation between sub's inside and outside by dropping the ball at the wellhead. The sub will be opened and closed by each ball dropped from the weillhead. The sub is suitable for horizontal and extended-reach wells. It is usually used in the cleaning and leaking process.