Wellbore interval densities

a technology of interval density and wellbore, applied in the field of geotechnical field measurements, can solve the problems of prohibitively high cost of relative minor interruptions in drilling operations, poor cuttings transport, and no disclosure of sequential computing methods, so as to increase the likelihood of rapid remediation of adverse conditions

Inactive Publication Date: 2013-02-28
SCHLUMBERGER TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]The disclosed embodiments may provide various technical advantages. For example, the computed interval densities may be further be evaluated during drilling (or other downhole operations) to identify various adverse conditions. These adverse conditions may include, for example, inflow from a subterranean formation to the wellbore, out

Problems solved by technology

There is considerable interest in the industry in risk avoidance since even relatively minor interruptions in drilling operations can be prohibitively expensive.
While along string pressure and temperature measurements are known in the art, there has been no disclosure of methods for computing sequential and non-sequential pressure and temperature interval densities nor any methods

Method used

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Embodiment Construction

[0029]FIG. 1 depicts a drilling rig 10 suitable for using various method embodiments disclosed herein. A semisubmersible drilling platform 12 is positioned over an oil or gas formation (not shown) disposed below the sea floor 16. A subsea conduit 18 extends from deck 20 of platform 12 to a wellhead installation 22. The platform may include a derrick and a hoisting apparatus for raising and lowering a drill string 30, which, as shown, extends into borehole 40 and includes a drill bit 32 deployed at the lower end of bottom hole assembly (BHA) 50. In the depicted embodiment, drill string 30 includes a plurality of joints of wired drill pipe and therefore provides a high bandwidth digital communications channel (e.g., a bandwidth on the order of 5 kilobits / sec) between the BHA 50 and the surface.

[0030]Drill string 30 includes a plurality of longitudinally spaced wired drill pipe repeater subs 34, at least some of which include annular pressure and temperature sensors 36 and 38. These se...

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Abstract

A method for estimating one or more interval densities in a subterranean wellbore includes acquiring first and second axially spaced pressure measurements in the wellbore. The pressure measurements may then be processed to obtain an interval density of drilling fluid between the measurement locations. A tool string including a large number of axially spaced pressure sensors (e.g., four or more or even six or more) electronically coupled with a surface processor via wired drill pipe may be used to obtain a plurality of interval densities corresponding to various wellbore intervals.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of U.S. Provisional Application Ser. No. 61 / 527,948 entitled Interpretation Methodologies and Calculations for Wired Drill Pipe Along String Measurements of Pressure and Temperature, filed Aug. 26, 2011.FIELD OF THE INVENTION[0002]Disclosed embodiments relate generally to geotechnical field measurements and more particularly to Along String Measurements (ASM) that may be incorporated in repeater hardware sections of Wired Drill Pipe (WDP). Methods are disclosed for computing sequential and non-sequential pressure and temperature measurements in these repeaters as well as pressures and temperatures measured by Bottom Hole Assembly (BHA) components. Methods are further disclosed for utilizing these measurements to characterize the subterranean formations, the drilling fluid, and the drilling process.BACKGROUND INFORMATION[0003]During drilling operations, measurements of downhole conditions taken while dri...

Claims

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Application Information

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IPC IPC(8): E21B47/00E21B47/06
CPCE21B47/00E21B49/005E21B47/06E21B49/003E21B47/003
Inventor RASMUS, JOHNLESSO, WILLIAMJAMES, JOHNTOLLEFSEN, EDWARD M.PAUL, SCOTTWEBER, AMANDA L.TURNER, MARCUSBOLCHOVER, PAUL
Owner SCHLUMBERGER TECH CORP
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