CATEGORIZED | News

MPD on drillship solves fluid loss problem

Posted on 26 February 2010

Drillship PMCD Rig-up

PMCD was deployed from a conventionally moored drillship offshore Indonesia after conventional drilling methods failed.

MPD on floating drilling rigs is significantly more complex due to vessel movement. A paper presented at the 2010 SPE/IADC Managed Pressure Drilling and Underbalanced Operations Conference, 24-25 February in Kuala Lumpur, explored “Pressurized Mud Cap Drilling on a Drillship in Indonesia.”

Because of huge subsurface caverns, pressurized mud cap was used and seawater flowed into the gaping cavities.

“One fluid goes directly into the formation,” remarked principal author Julmar Shaun Toralde, Weatherford Indonesia. “No sense using drilling fluids. It’s just a waste of money.”

If gas were to enter the annulus, Mr Toralde explained, the increase in annular pressure would be observed. At a 100-psi increase, bullheading would commence.

In Indonesia, MPD operations have been conducted from both semisubmersibles and drillships.

Pressurized mud cap drilling (PMCD) offers many advantages, Mr Toralde explained, including:

• Permits safe and efficient drilling in severe loss zones while allowing for detection of influx.

• Annulus is closed in at surface with RCD.

• Sacrificial fluid is injected into drillstring.

• Weighted fluid is pumped down annulus to fill hole and stop gas migration.

• Fluid and cuttings lost to formation.

In this instance, PMCD was performed on a conventionally moored drillship for an exploration well offshore Papua, Indonesia. The well was drilled vertically in some 110 m of water.

PMCD was used after several more conventional methods failed. These include trying to cure losses with lost-circulation materials, performing several sidetracks, waiting on mud materials and enduring other drilling problems associated with massive losses encountered in the lower portion of the well.

PMCD was used to drill 300 m more of the 6-ft section without problems, consuming only 16 hours.

Click below for an exclusive animation showing pressurized mud cap drilling.

YouTube Preview Image

Leave a Reply

*

FEATURED MICROSITES


Recent Drilling News

  • 26 November 2014

    US EIA: Increase in energy demand requires 33 million bbl/day more oil

    The world is going to need one-third more oil between 2010 and 2040, with developing countries, such as China and India, accounting for a major portion in the increase in...

  • 25 November 2014

    Prescriptive Analytics prescribes how to complete wells to maximize production

    "Big data" is taking on a new role in industry, where companies are combining the findings from geology and geophysics with new data collected from advanced technologies...

  • 25 November 2014

    Petrobras completes drilling first appraisal well in Libra Consortium

    Petrobras recently completed drilling the first appraisal well in the Libra area, the 3-BRSA-1255 (3-RJS-731), known as NW1. Located in the Northwest portion of the Libra block, in the pre-salt layer of the...

  • 24 November 2014

    Ensign secures contracts for 2 ADR 1500S pad drill rigs in Montney area

    Ensign Energy Services has signed contracts for two of its new ADR 1500S pad drill rigs for a major operator in the Montney area of northeast British Columbia...

  • 21 November 2014

    Statoil cancels Stena Carron rig contract offshore Angola

    Statoil has decided to cancel the Stena Carron rig contract after fulfilling the work commitments in the Statoil-operated blocks 38 and 39 in the Kwanza basin offshore Angola...

  • Read more news