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Environmental corrections in nuclear spectroscopy using variable shape standard

A technology of spectrum analysis and nuclear spectrum, applied in the direction of nuclear radiation exploration, measuring devices, instruments, etc., can solve problems such as impact

Inactive Publication Date: 2014-05-14
PRAD RES & DEV LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Another disadvantage is that the environmental conditions of the formation can vary from well to well and also with depth within a particular well, which can affect the energy spectrum measured using LWD neutron-gamma spectroscopy

Method used

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  • Environmental corrections in nuclear spectroscopy using variable shape standard
  • Environmental corrections in nuclear spectroscopy using variable shape standard
  • Environmental corrections in nuclear spectroscopy using variable shape standard

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Embodiment Construction

[0032] One or more specific embodiments of the present disclosure, including method, apparatus, and system embodiments, are described below. These described embodiments and their various elements are merely examples of the presently disclosed technology. Structural aspects of the disclosed apparatus provide means for carrying out the various aspects of the disclosed methods. It should be appreciated that in the development of any such actual implementation, such as in any engineering or design project, a number of implementation-specific decisions may be made to achieve the developer's specific goals, such as compliance with system-related and business-related constraints, The goals may vary by implementation. Moreover, it should be appreciated that such a development effort might be time consuming, but would nonetheless be a routine undertaking of design, fabrication, and production for those of skill in the art having the benefit of this disclosure.

[0033] When introduci...

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Abstract

An aspect of a formation may be estimated by placing a nuclear spectroscopy tool including a neutron source and a gamma ray detector into a borehole and performing a plurality of environmental measurements. Neutrons are emitted from the nuclear spectroscopy tool such that some of the neutrons generate gamma rays from a formation adjacent the nuclear spectroscopy tool, some of the neutrons generate gamma rays from elements within the nuclear spectroscopy tool and some of the neutrons generate gamma rays from an element in the drilling mud. An energy spectrum of gamma rays induced by the emitted neutrons can be detected with the tool.The detected gamma-ray energy spectrum can be analyzed using a combination of standard spectra, where the shape of at least one of the standard spectra can be varied based on the environmental measurements to account for the environment's effects on gamma-ray spectra.

Description

[0001] related application [0002] This application claims priority to U.S. Provisional Patent Application Serial No. 61 / 489,295, filed May 24, 2011, entitled "SYSTEMS AND METHODS FOR ENVIRONMENTAL CORRECTIONS IN NUCLEAR SPECTROSCOPY USING VARIABLE SHAPE STANDARD," the entire contents of which are Incorporated herein by way of incorporation by reference. technical field [0003] The present disclosure relates broadly to nuclear spectroscopy, and more particularly to methods of estimating and accounting for environmental effects on nuclear spectroscopy results. Background technique [0004] When drilling through rock formations or other formations in order to obtain oil, gas, or other materials, it is beneficial to determine or estimate the type of formation being drilled through. For example, information about formation type can be used to more accurately interpret other well log measurements to estimate formation porosity, water saturation, net hydrocarbon content, and fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V5/10
Inventor J·A·格劳J·迈尔斯M·贝雷德
Owner PRAD RES & DEV LTD
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