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Opportunity

Deepwater

Opportunity
Specific challenge

Perform coring in exploration wells in deepwater

India India

India

India

Challenge

  • First deepwater drilling in offshore exploratory well in India 
  • Interbedded shale and unconsolidated sand 
  • Previous poor recovery rates (0-50%) with competitor's coring system

Solution

  • Perform analysis of nearby well data 
  • Anti-jamming RockStrong™ system combined with FCS coring system with latest PDC core head to minimize vibration and capture unconsolidated formation at the bottom

Result

  • Extracted 90 m of core in approximately five runs with 100% recovery rate
  • Cored more than 6,000 m, deepest in operator’s history
  • Set records for deepest coring operation in India and deepwater application
  • Enabled full-suite studios on recovered core, identifying potential production zones

Overview

An operator planned its first drilling operation in the offshore deepwater region located in India. The goal was to extract core from vertical exploration wells at the greatest depth in its history in India.

Challenge

Previously, the operator had achieved poor recovery rates of 0 to 50% in deepwater coring operations within the unconsolidated/interbedded formations in the eastern offshore area using a conventional coring system. Concerned about these results, the operator turned to Halliburton for alternative technology to meet its coring goals.

Solution

Halliburton analyzed nearby well data and determined that the formation was interbedded with medium-hardness shale and unconsolidated sand. Based on this analysis, Halliburton recommended a 6 3/4 - x 4-in. RockStrong FCS™ coring system equipped with the latest polycrystalline diamond compact (PDC) core head design. The anti-jamming swivel assembly was chosen to minimize vibration while cutting through transition zones with the FCS™ full closure system assembly to capture the unconsolidated formation at the bottom.

+6,000

Meters cored

<10

Runs

100%

Recovery

Result

Halliburton extracted 90 m of core from this well in approximately five runs (12 1/4-in. and 8 1/2-in. sections combined) at a 100% recovery rate, with no safety issues or nonproductive time. The core was extracted from over 6,000 m, the deepest target cored to date in this operator’s history. This operation set records for the deepest coring operation in India and deepwater applications. The RockStrong FCS™  coring system allowed the operator to perform full-scale studies on the recovered core. These studies helped identify potential production zones for DST operations.

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