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Single Column Dual-Well Thermal Recovery Wellhead

Date:2024-05-06　Popularity:1377

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RockySea Single Column Dual-Well Thermal Recovery Wellhead


RockySea Petro has more than 40 years of experience in oil and gas wellhead & x-mas tree and valve production, with advanced manufacturing and testing equipment, can produce a variety of pressure levels, material levels, specification levels of well control equipment. After more than 20 years of development, Various types of thermal recovery wellhead & x-mas tree equipment have been formed, used in many oilfields in the world. RockySea Petro’s thermal recovery wellhead & x-mas tree are mainly of the following types:

  • Geothermal wellhead & x-mas tree
  • Blowout preventer Steam Injection and Oil Recovery Integration wellhead & x-mas tree
  • Steam injection and oil recovery dual tubing wellhead & x-mas tree
  • Single column dual-well thermal recovery wellhead & x-mas tree
  • Onshore thermal recovery oil and gas wellhead & x-mas tree
  • Conventional Steam injection and oil recovery wellhead & x-mas tree

Description 

RockySea Petro Group designed and manufactured single-column and dual-well thermal recovery wellhead & x-mas tree for onshore thermal recovery. The wellhead & x-mas tree is 3.6m in height and 7.8t in weight. We assembled 2 sets of wellhead & x-mas trees in one well slot. These 2 sets wellhead & x-mas tree can work independently, save platform space and improve platform oil recovery efficiency. This type of wellhead & x-mas tree has been already gotten National Utility Model Patent.

Single-column and dual-well thermal recovery wellhead & x-mas tree structure




1) Oilfield application 
RockySea Petro’s single-column and dual-well thermal recovery wellhead & x-mas tree were approved by CNOOC’s auditors and installed on the offshore oil recovery platform in May 2012. At present, the effect is good.



2) Design of casing head positioning pins 
Four positioning pins are designed on the big ring plate, and matching guide holes are designed on the small ring plate. When the casing head is installed, the guide holes of the small ring plate are matched with the positioning pins on the large ring plate to ensure the installation accuracy of oil wellhead manufacture christmas tree at the two wellheads.



3) Design of wellhead & x-mas tree stability 
We designed support bolts under the casing head adjustment plate to ensure wellhead & x-mas tree stability. A huff ring is designed on both casing heads to prevent tilt.




4) Design of large ring plate and compensate core 
The large ring plate is installed on the 30″ riser pipe to ensure that the ring plate will not be deformed when two sets of 300m long 9 5/8″ casing pipes are hung. When 2 sets of 9 5/8 “casing are suspended on the large ring plate through the compensate core. The core cannot be deformed. The core also plays the role of positioning, ensuring the center distance of two sets of the casing is 444mm.



5) Design of adjust flange design 
An adjustment flange is designed on the side of the throttle valve on the wing of the tree to ensure that the flow stroke of oil does not change during hot and cold recovery. The adjustment flange will be installed when steam is injected and removed during cold production, so that the crude oil flow will not change.



6) Design of Sector Flange 
In order to meet the requirement of 444mm center distance, casing head, casing head inverted slips, tubing head and adapter are designed into sector flange structure.




Data Sheet

Nominal diameter (in):2 9/16, 3 1/8
Maximum working pressure (psi)：3000, 5000
Working temperature：370℃
Material class：DD, EE, FF
Performance level：PR1
Specification level：PSL2, PSL3, PSL3G
Hang VIT and tubing:4 1/2BC, 3 1/2EU, 2 7/8EU

RockySea Petro

Contact: Mr.Victor Zhang

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