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51318-11430-Oil Wells Corrosion Prediction by GC Fingerprinting of Casings Fluids

In this paper, we have studied the ratio between light ends to heavy ends in different mixtures of diesel with two grades of crude oil utilizing gas chromatography.

Product Number: 51318-11430-SG
Author: Talal M. Alghamdi
Publication Date: 2018
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Part of any well completion job is the installation of multiple casings to isolate the well from any other reservoirs such as water aquifers. The space between each two casings is called the annulus. There are two kinds of annuli; tubular-casing annulus (TCA) and casing-casing annulus (CCA). While CCA is maintained at zero pressure, TCA should be maintained at positive pressure and this is usually accomplished by displacing the TCA with inhibited diesel. This practice would enable the quick detection of any possible casing leaks or downhole failure due to corrosion leading to TCA communication; either surface or downhole during production. The composition of diesel is mainly C9+ with a very minimum amount of light ends C3 to C7. Arab Light crude oil on the other hand is rich in light ends mainly because of the associated gas. In this paper, we have studied the ratio between light ends to heavy ends in different mixtures of diesel with two grades of crude oil utilizing gas chromatography. This will help production engineers for the early detection of any possible downhole communication caused by corrosion to maintain the well integrity. This study was conducted to assist one of the giant Arab Light reservoirs in the world as well as two additional reservoirs.

 

Keywords: well integrity, casing, annulus, BTEX, n-alkane, diesel.

Part of any well completion job is the installation of multiple casings to isolate the well from any other reservoirs such as water aquifers. The space between each two casings is called the annulus. There are two kinds of annuli; tubular-casing annulus (TCA) and casing-casing annulus (CCA). While CCA is maintained at zero pressure, TCA should be maintained at positive pressure and this is usually accomplished by displacing the TCA with inhibited diesel. This practice would enable the quick detection of any possible casing leaks or downhole failure due to corrosion leading to TCA communication; either surface or downhole during production. The composition of diesel is mainly C9+ with a very minimum amount of light ends C3 to C7. Arab Light crude oil on the other hand is rich in light ends mainly because of the associated gas. In this paper, we have studied the ratio between light ends to heavy ends in different mixtures of diesel with two grades of crude oil utilizing gas chromatography. This will help production engineers for the early detection of any possible downhole communication caused by corrosion to maintain the well integrity. This study was conducted to assist one of the giant Arab Light reservoirs in the world as well as two additional reservoirs.

 

Keywords: well integrity, casing, annulus, BTEX, n-alkane, diesel.

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