Schlumberger

Case Study: Petrobras Perforates 6,172-m High-Pressure Reservoir Using 7-in HSD Gun System, Offshore Brazil

Outstanding reliability exhibited when perforating a challenging deepwater well with 14,300-psi hydrostatic pressure

Challenge: Perforate a deepwater well exposed to 14,300-psi hydrostatic pressure.

Solution: Use the 7-in medium-pressure (MP) HSD high shot density perforating gun system that is rated for use in high-pressure wellbores.

Result:

  • Delivered optimal shot density with deep penetrating charges.
  • Achieved better dynamic underbalance effect.

Perforate a deepwater high-pressure well 

When preparing to perforate a deepwater well, Petrobras identified that the well had a hydrostatic pressure of 14,300 psi at 6,172 m as a result of the use of calcium bromide mud for well control. For these challenging conditions, Petrobras sought a perforating solution that would deliver the best, most reliable results to optimize production. 

Deploy high shot density guns rated for high pressure For optimal charge penetration and density and the creation of clean tunnels, Schlumberger recommended Petrobras deploy the 7-in MP HSD gun, which is rated to 16,500 psi for 12 spf and 135°/45° phasing using the PURE clean perforations system. The high pressure rating facilitates tubing-conveyed perforating (TCP) operations by providing a wider pressure range in which to perform completion and firing activities. The eFire electronic firing head was also used to measure the dynamic underbalance effect compared with the TCP design. 

Improved shot density and underbalance effect 

The 7-in MP HSD guns successfully perforated the high-pressure well using deep penetrating charges with high shot density and dynamic underbalance effect, exhibiting outstanding reliability and optimizing production.


Download: Petrobras Perforates 6,172-m High-Pressure Reservoir Using 7-in HSD Gun System, Offshore Brazil (0.32 MB PDF)

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Outstanding Reliability When Perforating High-Pressure Deepwater Well

The gauge raw pressure is the actual pressure recorded by e-Fire head during the perforating event compared with pressure at the top gauge, which was simulated using the PURE system.
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Remove Perforation Debris & Crushed-Zone Damage

PURE Perforating System for Clean Perforations
The PURE system creates clean perforations by optimizing the dynamic underbalance that occurs after charge detonation. Visit PURE System page