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Relative and absolute error models for subterranean wells

A technology of relative error and model, applied in the field of generating relative and absolute error models for well trajectory, drilling and surveying underground wellbore, can solve problems such as non-direct measurement, and achieve the effect of improving planning and placement

Inactive Publication Date: 2012-02-15
PRAD RES & DEV LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Another complication is that the azimuth of a twin well is usually not directly measurable due to magnetic interference from the target well, but is instead determined using the target well

Method used

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  • Relative and absolute error models for subterranean wells
  • Relative and absolute error models for subterranean wells
  • Relative and absolute error models for subterranean wells

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Embodiment Construction

[0031] figure 1 One exemplary embodiment of a well twinning operation, such as a SAGD twinning operation, is schematically depicted. A typical SAGD twinning operation requires the second well 20 to be drilled a substantially fixed distance above (though not necessarily directly above) the horizontal portion of the first well 30 . The second well is generally called a twin well or injection well. The second well may also be referred to herein as a drilled well. The first well is generally referred to as a target or production well. In the exemplary embodiment shown, production well 30 is first drilled, eg, using conventional directional drilling and MWD techniques. The target well 30 may then be sheathed, for example, using a plurality of pre-magnetized tubulars. Magnetic ranging measurements may be utilized to measure the distance between the twin well 20 and the target well 30 and guide subsequent drilling of the twin well 20 . Commonly assigned US Patents 7,617,049 and...

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Abstract

A relative error model is used to compute a relative uncertainty in the position of a first well with respect to a second well. This relative uncertainty may be computed in real time during drilling and may be used in making subsequent steering decisions during drilling. Moreover, an absolute uncertainty in the position of a first well may be obtained by combining an absolute uncertainty in the position of a second well and the relative uncertainty in the position of the first well with respect to the second well.

Description

[0001] related application [0002] This application requires an application filed on March 17, 2009 entitled Relative and Absolute Error Models for Subterranean Wells Benefit of U.S. Provisional Application Serial No. 61 / 160,870. technical field [0003] The present invention relates generally to drilling and surveying subterranean wellbores such as for use in oil and gas exploration. In particular, the invention relates to methods for generating relative and absolute error models for well trajectories and methods for combining uncertainties from multiple wells to obtain improved error models. Background technique [0004] In conventional drilling applications, error models are used to calculate the uncertainty of well trajectory as a function of measured depth. Such an error model defines the uncertainty in the location of the well as a function of measured depth. In such models, the uncertainties associated with making and interpreting survey measurements (eg, dip angl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/00E21B47/04
CPCE21B7/04E21B43/305E21B47/022
Inventor G.A.麦埃尔欣尼H.M.J.伊尔费尔德
Owner PRAD RES & DEV LTD