Downhole positioning system

A technology of electromagnetic positioning and positioning method, which is applied in positioning, radio wave measurement system, wellbore/well components, etc. It can solve problems such as deviation from the leased line, hindering the completion position of the driller, and difficult to associate

Inactive Publication Date: 2008-02-13
HALLIBURTON ENERGY SERVICES INC
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  • Abstract
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  • Claims
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Problems solved by technology

[0006] Positioning errors can also prevent operators from determining the cause of inconsistencies between geological models and well logs
When this inconsistency is due to positioning errors, operators cannot be sure that the model itself is incorrect (as a by-effect, available positioning measurement techniques and the vertical The difference in resolution between resolutions makes it difficult to correlate well logs with formation evaluation data used to form geological models)
[0007] Most importantly, positioning errors can prevent drillers from achieving optimal completion locations and even lead to off-lease lines
Each of the above issues can reduce the efficiency of producing oil from the reservoir

Method used

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Embodiment Construction

[0018] While the invention is susceptible to various modifications and alternative forms, specific embodiments are shown by way of example in the drawings and described in detail. It should be understood, however, that the drawings and detailed description are not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the claims .

[0019] Terminology

[0020] Some terms are used throughout the following description and claims to refer to specific system components. This document does not intend to distinguish between components that differ in name but not function. The terms "include" and "comprising" are used open-ended and should therefore be construed to mean "including without limitation". The term "coupled" is intended to mean either an indirect or direct electrical, mechanical or thermal connect...

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Abstract

Downhole positioning systems and associated methods are disclosed. In some embodiments, the system comprises a downhole source, an array of receivers, and a data hub. The downhole source transmits an electromagnetic positioning signal that is received by the array of receivers. The data hub collects amplitude and / or phase measurements of the electromagnetic positioning signal from receivers in the array and combines these measurements to determine the position of the downhole source. The position may be tracked over time to determine the source's path. The position calculation may take various forms, including determination of a source-to-receiver distance for multiple receivers in the array, coupled with geometric analysis of the distances to determine source position. The electromagnetic positioning signal may be in the sub-hertz frequency range.

Description

[0001] Statement Regarding Government-Sponsored Research or Development [0002] Not applicable Background technique [0003] A number of costly and / or dangerous situations can occur due to inaccuracies in positioning along wellbore trajectories and inaccurate positions along such trajectories with respect to well logs taken from formation properties in the same well. Specifically, the following are examples of problems due to positioning errors. [0004] In highly developed well areas, positioning errors can lead to borehole collisions. The intersection of different wellbores can lead to unwanted interactions between actions in different wellbores, including damaged tubing and unintended fluid exchanges. [0005] When performing geological operations drilling in a well area with a known geological model, positioning errors may lead to drilling judgment errors. Measured formation properties may correlate to incorrect beds in the model, causing drillers to operate wellbore t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/40E21B47/024E21B47/09E21B47/04
CPCE21B47/04G01S5/06G01V3/12E21B47/0228
Inventor 保罗·F·罗德尼
Owner HALLIBURTON ENERGY SERVICES INC
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