Correction to neutron gamma density measurements

A neutron and density technology, applied in the field of accurate NGD measurement results, can solve the problem of inaccurate NGD

Inactive Publication Date: 2016-06-08
PRAD RES & DEV LTD
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  • Abstract
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Problems solved by technology

While NGD measurements based on these gamma rays may be accurate in some formations, NGD may be less accurate in other formations

Method used

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  • Correction to neutron gamma density measurements
  • Correction to neutron gamma density measurements
  • Correction to neutron gamma density measurements

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Embodiment Construction

[0026] One or more specific embodiments of the present disclosure will be described below. These described embodiments are merely examples of the presently disclosed technology. Additionally, in an effort to provide a concise description of these embodiments, all features of an actual implementation may be described in the specification. It should be understood that in developing any such practical implementation, as in any engineering or design project, a number of implementation-specific decisions can be made to achieve the developer's specific goals, such as alignment of system-related and business-related constraints, which Constraints may vary from implementation to implementation. Furthermore, it should be understood that such a research and development effort might be complex and time consuming, but would be no more than a procedure for carrying out design, engineering, and manufacture to those skilled in the art having the benefit of this disclosure.

[0027] When in...

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Abstract

Systems, methods, and devices are provided to determine an accurate neutron-gamma density (NGD) measurement for a broad range of formations, including low-hydrogen-index or low-porosity formations and formations with heavy elements. For example, such an NGD measurement may be obtained by emitting neutrons into a formation such that some of the neutrons inelastically scatter off elements of the formation and generate inelastic gamma rays. The neutrons and inelastic gamma rays that return to the downhole tool may be detected. Some characteristics of certain formations are believed to affect the fast neutron transport of the formations. Thus, if a formation has one or more of such characteristics, a correction may be applied to the count rate of neutrons, the count rate of inelastic gamma rays, or the neutron transport correction function, upon which the neutron-gamma density (NGD) may be determined.

Description

technical field [0001] The present disclosure relates generally to Neutron-gamma density (NGD) logging, and more specifically, to techniques for obtaining accurate NGD measurements in certain formations. Background technique [0002] This section is intended to introduce the reader to various aspects of technology, which may be related to aspects of the present disclosure, which are described and / or claimed below. It is believed that this discussion is useful to provide the reader with background information that may be helpful in better understanding various aspects of this disclosure. Accordingly, it should be understood that these statements are to be read in light of these, and not as admissions of prior art. [0003] Formation density is a measurement often obtained in well logging. One way to determine the density of a formation may be referred to as gamma densitometry, which involves detecting the extent to which gamma rays are scattered by the formation. Routinely...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00G01V5/14
CPCG01V5/104
Inventor M·埃文斯M-L·莫博涅
Owner PRAD RES & DEV LTD
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