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Using a fiber-optic seismic array for well monitoring

Total E&P Norge, Stavanger, Norway

Eric Mastin, Jacques Blanco and Michel Maguérez

Total E&P France, Lacq

Tad Bostick and Svere Knudsen

Weatherford, Houston, USA

Corresponding author: eric.mastin@total.com

The first 20% of the full text of this article appears below.

At the end of 2002, permanent fiber-optic sensors were first used to carry out seismic recordings on the Izaute gas storage field. This successful experiment illustrates the potential applications of this technology; these include measurement of pressure, constraints, temperature, and seismic that can be used in such applications as microseismic monitoring and multiphase metering.

Fiber optics as sensors have numerous advantages—reliability at high pressure and over a very wide range of temperatures, signal unaffected by outside disturbances, compactness, even when an array of sensors are included. These sensors are also capable of repeat measurements such as those needed for reservoir monitoring. Three hundred wells have already been fitted with networks of fiber-optic DTS (distributed temperature sensors). This article describes how fiber-optic sensors acquire seismic data in a well.

	Background

 
About 15 years ago, the U.S. Navy began research on Bragg grating technology (see appendix). In 2000, CiDRA and Optoplan, proposed a joint project to develop and test their fiber-optic seismic sensing system. This development, included in the Norwegian Demo 2000 sponsored program, was supported by a consortium of oil companies (Total Norge, Statoil, Norsk Hydro, and BP).

CiDRA's Optical Sensing Systems were made available in 2001 and its Optoplan in 2002 by Weatherford which continued to fine tune an enhancement that would enable several small sensors to be set inside a single fiber.

Well 102 on Izaute (operated by Total) was selected (among others) as . . . [Full Text of this Article]