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Casing corrosion monitoring in multiple casing well completions using pulsed neutron instrument

IP.com Disclosure Number: IPCOM000247541D
Publication Date: 2016-Sep-14
Document File: 4 page(s) / 779K

Publishing Venue

The IP.com Prior Art Database

Abstract

Monitoring well integrity gets challenging in multiple casing completions. This invention suggests a methodology to monitor the casing corrosion by analyzing the gamma rays associated with neutron interaction with a material tagged in the casing. Different casing can be tagged with different materials for enabling monitoring of multiple casings.

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Title:  Casing corrosion monitoring in multiple casing well completions using pulsed neutron instrument

Abstract:  Monitoring well integrity gets challenging in multiple casing completions. This invention suggests a methodology to monitor the casing corrosion by analyzing the gamma rays associated with neutron interaction with a material tagged in the casing. Different casing can be tagged with different materials for enabling monitoring of multiple casings.

Description:  Monitoring the casing condition in down-hole well environments is imperative for safe production from the oil and gas reservoirs. Most conventional methods to monitor casing corrosion are only applicable for a single casing and face challenges for evaluating the integrity of the second or third casing (as shown in Fig 3). This idea proposes a technique to measure casing condition in a multiple casing environment by using a pulsed neutron tool.

1.       The first or the innermost casing can be tagged with a certain material, which emits gamma rays after getting bombarded with fast neutrons emitted by pulsed neutron source. The gamma rays emitted will be of a characteristic energy associated with that particular material.

2.       The second or the outer casing can be tagged with another material, which emits gamma rays after getting bombarded with fast neutrons emitted by pulsed neutron source – but, the energy of these gamma rays is different than the energy of the gamma rays emitted by the material tagged in the first casing.

3.       Computational particle simulation software like Monte Carlo N-particle (MCNP) or GEANT4 can be used to identify the maximum (perfect casing condition without corrosion) and minimum (no casing) amplitude of the gamma rays expected in the particular borehole configuration.

4.       The measured gamma rays will be compared with the simulated maximum and minimum levels to determine the corrosion level of individual casings, as shown in Fig 1.

5.       The scenario is not limit...