Abstract

The design of wells into two sections (16″ × 13 3/8″ and 12 ¼″ × 9 5/8″) in the Ecuadorian basin is a challenging effort of engineering. The success of the well depends on various techniques that will be analyzed in the following paper, which include precise casing seating depth, accurate fluid density for each section, appropriate formation bridging and sealing in the production zone (Napo), correct chemical selection as part of the fluid system to reduce formation damage on the producing reservoirs, plan a suitable directional trajectory if vertical section aloud (less than 2000') use "S" type design and appropriate BHAs for each section taking into account formation tendencies in terms to reduce slides in the case of PDM BHA is used. Other techniques applied that are going to be reviewed are include cementing production casing can be used slurries with higher densities to achieve better cement quality having less ECD during jobs; the two section design allows to run larger diameter guns and higher penetration bullets into productive sands, artificial lift systems can be set close to the producing reservoir. Using these techniques in the two sections design can provide several advantages compared with conventional three or four sections design in the Ecuadorian basin. This advantages are less cost for Drilling Event by time, by materials and equipment used, avoid adding risk when setting expandable 7″ Liner Hangers, reduce risk of drilling tools and Wireline logs to get stuck related to higher clearance between them also Casings can run smoothly, improving production from reservoirs drilled through.

The result of first well drilled using these techniques will be presented in the following paper taking into account design facts, programs and procedures during the operation, and the results that will demonstrate the value of the design.

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