ENI (Agip) Djambala Sounda

Republic of Congo

Landmark: Equipment Delivered in Forty (40) Weeks from Order

Project Overview

Contract Award: 1997 (Ph I), 2001 (Ph II), 2003 (Ph III), 2005 (Ph IV)
Sales: Dunfermline, U.K.
Fab. Trees: Dunfermline, U.K.
Fab. Controls: Kongsberg, Norway
Service Base: Aberdeen & Bergen
Host Type: Platform
Contract Type: EPC

Project Characteristics

No. Trees: 4 (Ph I), 1 (Ph II), 1 (Ph III), 1 (Ph IV)
Water Depth: 120 m (390 ft)
Tree Type: Horizontal
Tree Pressure: 5,000 psi
Tree Bore Size: 3"x2"
Hydrocarbon: Oil

Project Ownership

ENI 65%
Hydro Congo 22%
Sasol 13%

Scope of Work

Seven (7) horizontal 3"x2" 5,000 psi subsea trees
Conversion kits to existing wellheads
Two (2) pipeline end manifolds
Tree to PLEM jumpers (as kits for local fabrication)
Workover umbilicals
Electro-hydraulic subsea controls
Topside controls for platform
Refurbishment and reuse of customer-owned installation tooling including workover HPU, subsea test tree, tree and tubing hanger running tools, ROV intervention tooling
System integration testing, installation assistance, service and maintenance

Comments

The field development consists of three (3) independent reservoirs, namely, Kitina, Djambala and Sounda. The initial contract for the Djambala and Sounda Fields was for two (2) subsea wells at each location. Two (2) 6" pipelines were used to carry the produced fluids back to the Kitina host platform for processing and onward via a 14" export pipeline to the Djeno onshore terminal 65 km (40 miles) away. The PLEMs were designed to allow round-trip pigging, and the system was designed to allow expansion to other areas to the north of Djambala by means of a removable pigging loop.

Sounda was not developed, and the two (2) subsea trees and PLEM were used on a more productive find at Djambala South. Only one (1) subsea tree was installed at Djambala North. The production at Djambala South was enhanced by the addition of a water-injection tree and later an additional production tree, which was installed in 2004.

In 2005 an addition production tree was ordered which will be installed end 2006 together with a simplified water- injection tree in connection with the Djambala South.

The system was designed for diver-assist installation and diverless operation. The horizontal tree design used on the Bouri project was reused with a minimum of changes, minimizing the engineering and allowing this project to achieve a fast-track schedule of only 40 weeks from contract award to delivery for the first two (2) subsea trees and manifold. The subsea trees have integral protective structures, and the PLEMs are designed to be installed on a standard 30" wellhead housing which serves as the foundation pile.