Schlumberger

Technical Paper: New LWD Slimhole Imaging Technology Applications for Completion System Optimization in Naturally Fractured Carbonate Reservoirs in Mexico

Society: IBP
Paper Number: IBP3008
Presentation Date: 2010
 

Abstract

Open-hole completion with inflow control devices (ICDs) was implemented in the most recent horizontal wells in the Cantarell field to improve well performance and enhance reservoir management by mitigating undesired water or gas breakthroughs. The approach taken by PEMEX consists of reducing drawdown in high-permeability sections to allow more oil to flow from lower-productivity sections and isolating highly fractured zones that could be connected to an aquifer. Success of the completions with ICDs relies heavily on an accurate formation evaluation.

Borehole images are used for fracture identification and quantification in the horizontal section. Fracture analysis is used to identify and isolate highly fractured zones and estimate permeability along the horizontal section. Wireline borehole imaging tools were used for the first horizontal wells in the Cantarell field to provide this essential information. A horizontal well is a challenging environment for data acquisition with wireline logging tools because they require drill pipe conveyed or a wireline tractor system. There are many cases where wireline tools were not able to reach total depth due to borehole conditions, thus leaving horizontal section without acquiring necessary information for ICDs completion design.

In order to assure the information needed, there are new technologies that could be used during drilling or in wiper trip mode to record the data minimizing the risks and optimizing acquisition time. This paper presents a case study demonstrating the results obtained for two horizontal wells, Cantarell-490H and Cantarell-470H, using a new LWD slimhole imaging technology. This provided an opportunity to reduce the risk of data acquisition as well reducing additional acquisition time. This new generation of measurement designed for slimhole provides laterolog resistivity and borehole images in 6 inches hole sizes drilled with conductive mud. Borehole resistivity images are acquired in 56 sectors, providing full borehole coverage.

The resistivity images acquired with the new LWD slimhole imaging technology enabled the identification of natural and induced fractures, vugs, and dips. The image interpretation integrated with petrophysical analysis allowed for optimum placement of the ICDs and openhole packers for the completion of the wells in this case study.

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