Oil and Gas Well Completions

Tubinghead and X-mas tree

 

Tubinghead

•Surface equipment from which the tubing is suspended

Xmas tree or valve array

•Used to control well during production

•Mounted above wellhead

•Typically sourced from same manufacturer

Tubinghead Functions

Primary functions of tubinghead

•Suspend tubing with hanger

•Seal between tubing and annulus

•Provide access ports to annulus

–gas lift gas

–inhibitor injection

–circulating the well

•Provide mounting for adapter flange or Xmas tree

Tubing Hanger Types 

•Threaded Hanger Flange

–used in low pressure wells (e.g. Pumping wells)

•Boll Weevil Type

•Ram Type Tubing Hanger

 

•Boll Weevil Type

 
Tubing Hanger for Bowl Type Tubing Head.

–Less suitable to land tubing in tension

•Ram Type Tubing Hanger

–allows free tubing manipulation to latch tubing in tension

Tubing Hanger with Extended Neck

Hanger may have extended neck

•Projects into base of X-mas tree or adapter flange

•Sealed flow path through wellhead
Xmas tree or adapter interface

 

Adapter Flange

•Cross-over between tubing hanger spool and x-mas tree

•It can receive the extended tubing hanger neck

•Feed through for:

– electrical cables (ESP or sensors)

– hydraulic controllines (sc-sssv)

–sensor lines etc