Single column dual-well thermal recovery wellhead

Sanjack’s thermal recovery wellheads are mainly of the following types:

  • Conventional Steam injection and oil recovery wellhead
  • Onshore thermal recovery oil wellhead
  • Single column dual-well thermal recovery wellhead
  • Steam injection and oil recovery dual tubing wellhead
  • BOP Steam Injection and Oil Recovery Integration Wellhead
  • Geothermal wellhead

Sanjack has more than 40 years of experience in wellhead & x-mas tree and API 6A valve production, with advanced manufacturing and testing equipment, can produce a variety of pressure levels, material levels, specification levels of wellhead & x-mas tree. After more than 20 years of development, thermal wellhead has formed a variety of products, used in many oilfields in the world.

Sanjack Group designed and manufactured single-column and dual-well thermal recovery wellhead for onshore thermal recovery.

The wellhead is 3.6m in height and 7.8t in weight.

We assembled 2 sets of a wellhead in one well slot.

These 2 sets of wellhead can work independently, save platform space, and improve platform oil recovery efficiency.

This type of wellhead has been already gotten National Utility Model Patent.

The oil well structure

Single-column and dual-well thermal recovery wellhead structure

adjust flange

1) 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.

sector structure

2) 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.

adjust flange

3) Design of large ring plate and compensate core

The large ring plate shall be installed on the 30 “riser to ensure that the large ring plate does not deform when hanging two sets of 9 5/8” casing 300 meters long.

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.

casing head positioning pins

4) Design of wellhead stability

We designed support bolts under the casing head adjustment plate to ensure wellhead stability.

A huff ring is designed on both casing heads to prevent tilt.

wellhead stability

5) Design of casing head positioning pins

We designed four positioning pins on the large ring plate and matching guide holes on the small ring plate.

When the casing head is installed, the guide hole of the small ring plate is matched with the positioning pins on the large ring plate to ensure the installation accuracy of the two wellheads.

sector-structures

6) Oilfield application

Sanjack’s single-column and dual-well thermal recovery wellhead were approved by CNOOC’s auditors and installed on the offshore oil recovery platform in May 2012. At present, the effect is good.

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

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