SPE/IATMI Asia Pacific Oil &Amp; Gas Conference and Exhibition 2015
DOI: 10.2118/176356-ms
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Maximising Logging While Drilling Value in Carbonate Wells Drilled in Pressurised Mud Cap Drilling Conditions: Challenges, Solutions, and Advances

Abstract: The interest in exploring carbonate reservoirs has experienced a rapid growth in south-east Asia. However, significant drilling hazards have been encountered where karstification and fractures are present. This led to deployment of pressurised-mud-cap drilling (PMCD) to address total losses. PMCD involves drilling with no returns to surface, while drilled cuttings are injected back to the lost circulation zones. Under the PMCD conditions, wireline logging is usually ruled out, making logging-while-drilling (LW… Show more

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“…In PMCD, a sacrificial fluid is pumped through the bit nozzles to fill any fractures and caves, while a heavier fluid is pumped into the annulus to maintain the mud cap and prevent gas migration up to the surface. Today this is the most common practice for drilling in carbonates used by drilling companies [10][11][12][13][14].…”
Section: Introductionmentioning
confidence: 99%
“…In PMCD, a sacrificial fluid is pumped through the bit nozzles to fill any fractures and caves, while a heavier fluid is pumped into the annulus to maintain the mud cap and prevent gas migration up to the surface. Today this is the most common practice for drilling in carbonates used by drilling companies [10][11][12][13][14].…”
Section: Introductionmentioning
confidence: 99%
“…In this case, the well is converted for pressurized mud cap drilling (PMCD) and drilling can be continued with the controllable pumping of sacrificial fluid and drilling cuttings into caves, fractures and other highly permeable zones. The efficiency of this approach was demonstrated by a number of wells drilled in carbonates [15][16][17][18]. However, MPDbased solutions for drilling risk minimization have limitations.…”
Section: Introductionmentioning
confidence: 99%