RIASSUNTO
Abstract
Novel well completion techniques and exceptional field execution allowed the six well completions on the Anadarko operated Marco Polo Deepwater TLP project in Green Canyon 608 to be accomplished in world-class fashion.All six wells (seventeen frac packs) were placed on production in only 168 days, including 14 days lost due to storms, after riser tie-back operations were complete.An operational efficiency of 85%, with weather downtime accounting for 9% and other lost time accounting for 6%, was obtained during the completion campaign.
This paper will focus on how the implementation challenges of completing seventeen zones in six deepwater dry-tree wells with a 1000 hp rig were met, and will highlight a number of concepts and technical firsts that can be applied to other deepwater development projects.
Background
Anadarko's Marco Polo deepwater development project is located in Green Canyon Block 608 in the Gulf of Mexico, approximately 175 miles south of New Orleans, in a 4300' water depth environment.
Field Development
The Marco Polo Field was discovered in 2000, and the project was sanctioned for development in 2001.Six development wells were drilled in 2002 and 2003, and were temporarily abandoned to await completion after installation of the TLP in 2004 (Refer to Figure 1, Marco Polo TLP).The TLP hull and deck were installed in January 2004, and were designed to accommodate a 1000-hp completion rig to run riser tiebacks and perform completions.Only 88 persons are allowed on the platform at a time (maximum POB) due to USCG rules, a significant issue for rig operations.
Geological
The Green Canyon Block 608 (Marco Polo) field is located in the southern portion of the Marco Polo salt withdrawal mini-basin.The depositional model for the field is a restricted basin floor amalgamated sheet fan sand.Moderate to strong aquifer support was expected, although the potential presence of internal baffles and barriers introduce uncertainty to the extent of the aquifer support.
The trap geometry was created by salt withdrawal and extensional faulting due to sediment loading on the eastern side of the salt ridge.The primary trap consists of a fault bounded graben dipping away from the salt ridge.The main faults are west-southwest to east-northeast trending faults that form the graben.The updip trap component to the west is salt and/or sand punch-out.The graben is further subdivided into separate compartments by additional faulting.Refer to Figure 2, Marco Polo M10 Sand Structure Map.
Two main fault compartments make up the Marco Polo field.Another graben fault, downthrown to the north west and trending in the same direction as the bounding faults, subdivides the graben into these two main compartments, designated as Fault Block I and Fault Block II. The two main compartments are further subdivided into two additional compartments by faults that are trending northwest to southeast and downthrown to the west (towards salt).The four main producing compartments for the Marco Polo field are designated FB IA, FB IB, FB IIA and FB IIB (Updip compartments are denoted ""A"").
The productive horizons at the Marco Polo Field consist of seven stacked Lower Pliocene sandstone reservoirs; the M10, M20, M30, M40, M50, M60, and M70; 75% of the reserves are concentrated in the M40 and M50 Sands.Reservoir depths range from 11000 to 13500' tvd-ss.Refer to Figure 3, Marco Polo Type Log.
A complete open hole logging suite was obtained on all discovery and development wells.Continuous whole core was obtained through both the M-40 and M-50 intervals in the GC 608 #1 ST#1 wellbore.