RIASSUNTO
Abstract
Multizone single trip (MST) systems are currently being evaluated for deep water low tertiary (LT) trends1 where multiple sand control intervals are required. However, this technology can be implemented in other applications. This paper will review the use of this system in two case histories.
The first and primary case history, Mississippi Canyon (MC) 502 Well 2, was the first implementation of a multizone system in the deepwater Gulf of Mexico (GoM). MC 502 Well 2 was part of the Longhorn development, where four (4) different completion types were implemented in the same field, similar measured depth (MD) and pressure regime. A direct comparison of the completion techniques will detail the time savings associated with the MST system.
The second case history, West Delta (WD) 89 Well A-01, is an innovative solution to a downward recompletion using a MST system to isolate the previous completions. Without the MST technology, this well probably could not have been completed.
Based on the results of these case histories, MST completion techniques should be considered for all equivalent pressure multizone completions. Additionally, a MST system is a tool than can be utilized in more applications than high cost deepwater stacked completions.
Increasing the tools available to perform completion operations is always significant. The resulting savings associated with this technology, is in the multiple million dollar range. By proving up this technology, MST sytems will allow the LT trend to be developed more economically.
Introduction
The Longhorn development is located in the Gulf of Mexico (GoM) in the central part of Mississippi Canyon (MC) approximately 60 miles south of Venice, Louisiana and 100 miles south of New Orleans, Louisiana in an average water depth of 2500ft (750m). The location and block positions are detailed in Figure 1: Longhorn Field Development Area.
The development lies in two blocks, MC 502 and MC 546. Three (3) primary reservoirs were developed in the Longhorn field, the 9800', 12200' & 12500' sands, utilizing four (4) subsea wells, tied back to the Corral platform 18 miles to the northwest.