Tool Introduction

Expansion joints are mainly used for full bore formation testing, suspension testing, fracturing, acidification and other operations on drilling floats. They compensate for the elongation and contraction of the pipe column caused by the up and down floating of the drilling float, and ensure that an appropriate amount of gravity is placed on the downhole tools; It can also be used in onshore geological testing operations to compensate for the elongation and contraction of the tubing caused by temperature and pressure changes.

Structural characteristics

① Regardless of elongation or contraction, its internal cavity volume remains unchanged, thereby maintaining a constant pressure inside the tubing string;

② Special central axis structure design, more reliable sealing and longer service life compared to other expansion joints;

③ Large telescopic travel, providing a range of up to 1.5 meters;

④ Due to its internal pressure balance characteristic, when used to test the lower end of the valve, it can minimize the pressure fluctuation of the pressure gauge;

⑤ The torque key can transmit the torque of the pipe column.

operation

When used with a mechanical packer, it is in a contracted state after the packer is sealed, and during operation, it can freely compensate for the elongation and contraction of the pipe string.

technical parameter