Enhanced Coiled Tubing Improves Well Intervention Offshore Malaysia

Perforation technique reignites production at Angsi field

The Angsi field is a significant priority in terms of oil and gas production for Petronas Carigali Sdn. Bhd., a subsidiary of Malaysia’s national oil company. Exploration in the field began in 1974, with first oil and gas production in 2001 and 2002 respectively. In 2004, Well A-33, which penetrated three pay zones, was drilled and completed with dual 3 1/2-in oil and gas production tubing. In mid-2008 the well ceased production due to low flow-tubing-head pressure. In 2009 and 2010 the string was again put onstream to assess its potential. Three well tests were carried out. The average gas rate obtained was less than 5 MMcf/d. Because of the production decline, it was decided to restore potential by adding perforations via coiled tubing. Adding perforations is challenging because of complexities such as on-depth perforation, depth accuracy of coiled tubing, and uncertainty of depth correlation prior to detonation.

Enhanced Coiled Tubing Improves Well Intervention Offshore Malaysia

ACTive PTC

CT real-time pressure, temperature, and casing collar locator tool

Improve job efficiency and subsequent well performance with real-time downhole measurements.

CIRP

Completion insertion and removal under pressure equipment

Insert and retrieve long gun strings under wellhead pressure when the surface pressure control equipment is shorter than the gun string.

ACTive GR

CT real-time gamma ray logging tool

Detect naturally occurring gamma rays in adjacent formations while maintaining pumpthrough capability.

Jet Blaster

Engineered high-pressure jetting service

Perform wellbore cleanouts including sand lift, tubing-scale removal, sand screen cleaning, and near-wellborn skin removal.

eFire-CT

Coiled tubing–deployed electronic firing head

More efficiently and economically perform a wide range of downhole explosive operations.