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Riserless interval

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(a) Definitive survey vs. high data frequency measurements—<span class="search-highlight">Riserless</span> <span class="search-highlight">Interv</span>...
Published: 23 December 2009
Fig. 15 (a) Definitive survey vs. high data frequency measurements—Riserless Interval 1; (b) conductor-casing-slackoff chart for wellbore depicted in Fig. 15a . More
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, September 30–October 3, 2001
Paper Number: SPE-71752-MS
... being employed to redefine interval limitations in deepwater operations. This discussion includes limitations of conventional methods, types of riserless fluids in use today as well as future considerations, the benefit of new hardware designed to optimize the process, challenges accompanying this new...
Proceedings Papers

Publisher: Society of Petroleum Engineers (SPE)
Paper presented at the IADC/SPE International Drilling Conference and Exhibition, March 8–10, 2022
Paper Number: SPE-208793-MS
...Abstract Abstract Drilling hazards in deepwater riserless intervals include shallow water and gas flows, disassociating gas hydrates, lost circulation and formation instability all which are particularly challenging without a proper mitigation strategy. Unmitigated, these hazards can result...
Proceedings Papers

Paper presented at the IADC/SPE Drilling Conference, March 4–6, 2008
Paper Number: SPE-112630-MS
... Abstract The operator and co-venturers are developing several Angola Block 15 fields in water depths of up to 1400m. To date, 83 development wells and 33 exploration / appraisal wells have been drilled in the Block. Most have experienced hole quality issues in the riserless interval...
Proceedings Papers

Paper presented at the SPE/IADC Drilling Conference, February 19–21, 2003
Paper Number: SPE-79878-MS
... shallow water flow zones and a narrow pore pressure to fracture gradient margin requiring a very aggressive top hole casing program, including the drilling of two riserless intervals prior to running the 20-inch conductor casing. Riserless drilling of the upper intervals of subsea wells has been standard...
Proceedings Papers

Paper presented at the SPE/IADC Drilling Conference, February 27–March 1, 2001
Paper Number: SPE-67773-MS
... with a shallow flow zone can ultimately prevent deepwater wells from reaching projected casing points and even total well depths.1 The technical challenges commonly encountered when drilling riserless intervals are: Logistics - being able to supply enough weighted fluid at the wellsite to drill the interval...
Journal Articles
SPE Drill & Compl 24 (04): 484–497.
Paper Number: SPE-112630-PA
Published: 23 December 2009
...Fig. 6 Type of well and depth of riserless interval by drill location. ...
Proceedings Papers

Paper presented at the SPE Trinidad and Tobago Section Energy Resources Conference, June 25–26, 2018
Paper Number: SPE-191174-MS
... Artificial Intelligence drilling fluid chemistry planning &amp; scheduling drilling fluid formulation riserless interval drilling fluid selection and formulation drilling fluids and materials LMP offshore supply base bulk facility requirement drilling fluid property Upstream Oil...
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Location of maximum drillstring overpulls on trip out of the hole in riserl...
Published: 23 December 2009
Fig. 10 Location of maximum drillstring overpulls on trip out of the hole in riserless interval—conventional MODU wells. More
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Location of maximum drillstring overpulls on trip out of the hole in riserl...
Published: 23 December 2009
Fig. 9 Location of maximum drillstring overpulls on trip out of the hole in riserless interval—slimhole MODU wells (OP: overpull). More
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 9–11, 2017
Paper Number: SPE-187052-MS
...-diameter deepwater intervals can cause bit balling, especially with water-based fluids. The dynamic elements of the hybrid drill bit, namely the rolling cones, lead to better bit cleaning and lower balling potential. The riserless intervals of deepwater wells are drilled with fluid pumped down through...
Proceedings Papers

Paper presented at the SPE/IADC Drilling Conference and Exhibition, March 1–3, 2011
Paper Number: SPE-140159-MS
.... These challenges have resulted in new technologies and methods to exploit more resevoirs coupled with new and complex well designs. Riserless drilling has been used for years to construct the shallow intervals of deep water wells due to the low facture gradients in the shallow sediments. However increases in pore...

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