LOWERY WELLHEAD DIVISION

LOWERY WELLHEAD PRODUCTS

Oilfield customers have come to rely on the Lowery line of made-in-the-U.S.A. wellheads. We’re pleased to offer Lowery’s well-known, high-quality products from our API Spec Q1-certified Lowery Wellhead Division Facility.

 

Casing Heads:

Casing heads are used to hang the casing in the wellhead. Some locations may elect to set casing on the bottom of the hole but the most common method is to suspend the casing. Three common terms used for casing hangers are manual hangers, automatic hangers and mandrel hangers. Manual hangers are typically landed in the wellhead after the casing has been cemented and the casing is stretched. The slips on the ID of the hanger will bite into the pipe and the remaining load is transmitted to the casing head load shoulder. The load path is from the pipe to the slips, to the casing hanger body to the casing head load shoulder. The annulus seal is then energized manually by applying torque to a series of bolts in the top of the casing hanger. Automatic casing hangers employ the load from the stretched drill pipe to energize the annulus seal. The load path is from the pipe to the slips, to the casing hanger body, through the seal, to the casing head load shoulder.  The third type of casing hanger is the mandrel hanger. The mandrel is actually screwed onto the casing joint and does not use slips to grip the pipe. The hanger will often have a seal integrated into the OD and it requires minimum amount of loading to seal. Mandrel hangers are most often used in multi-bowl wellheads and the annulus seal can be a separate component that is installed after the hanger is landed. Generally the seal is a low-compression elastomer.

 

Tubing Heads

Equipment attached to the casing spool used to hang the tubing (smallest casing string) and seal the annulus between the tubing and casing. The top spool on a wellhead assembly contains the highest pressure in the wellhead, and contains a load shoulder to hang the tubing hanger and tubing string.

 

WNS Lowery flanges connect to the casing or tubing head.  The Series B-1 is a threaded hanger style and used to hang tubing in a free flowing well application.  The Series 612 is a slip style flange used to hand tubing in artificial lift wells.  BOP flanges connect to the wellhead to support various BOP configurations.

 

Bell nipples are utilized to set the proper height of the tubing head.  WNS Lowery offers two versions, Series J-55 is a lightweight profile and Series N-80 is a heavy duty model.