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Eccentric wellhead

Eccentric wellhead

Under normal circumstance, it can be used as common wellhead but it can adjust the position of oil pipe if the center of polished rod deviates so as to correct the said deviation.

Working Principle

Under normal circumstance, it can be used as common wellhead but it can adjust the position of well pipe if the center of polished rod deviates so as to correct the said deviation.
When annulus logging operation is conducted, operation can be carried out through the logger below the eccentric hole after opening 1(1/4)″ sluice valve by installing the annulus logging device.

If the eccentric hole or oil pipe needs rotating during the operation, the eccentric body shall be rotated and used where it is proper.

Parameters

This eccentric wellhead is applied to the annulus logging test of 5(1/2)″ and 7″ cased well.


The upper and lower ends of the rotation short section of oil pipe are 2(7/8)″ flat oil pipe fasteners and 2(7/8)″ upset oil pipe fasteners.

 

All the bypasses are either 2(3/8)″ flat oil pipes or 2” flange boards, both of which are connected with transfusion pipeline.


The upper end of eccentric bore is ZG1(1/4)″ fastener, the drift diameter of which is Φ34mm.


Φ211.1 steel ring seal groove is set at the bottom of the enclosure to coordinate the cross of the wellhead.


The load of the bearing box where the oil pipe is installed shall be above 70t to ensure the load rotation.


The sealing pressure is 14MPa.

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