Fluid characterization from acoustic logging data
AssigneeSchlumberger Technology Corporation
InventorsANDREW HAWTHORN, LUCIAN KING JOHNSTON, DAVID LINTON JOHNSON, TAKESHI ENDO, HENRI-PIERRE VALERO
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Abstract
A method and system for fluid characterization in an underground formation surrounding a borehole are provided. Acoustic signals are transmitted and received in the borehole. The received acoustic signals are processed to obtain at least one attribute of formation mobility. Formation fluid is characterized based on a change of the at least one attribute. A decision is made based on the characterization output.
Claims48
A method for fluid characterization in an underground formation surrounding a borehole, comprising:
- a) transmitting and receiving acoustic signals in the borehole;
- b) processing the received acoustic signals to obtain at least one attribute of formation mobility;
- c) giving a characterization of fluid based on a change of the at least one attribute;
- d) outputting the characterization;
- and
- e) making a decision for well placement based on the characterization.
A system for geosteering while drilling an underground formation, comprising a computer having a processor and a memory, wherein the memory stores a program having instructions for:
- a) transmitting and receiving acoustic signals in the borehole;
- b) processing the received acoustic signals to obtain at least one attribute of formation mobility;
- c) giving a characterization of fluid based on a change of the at least one attribute;
- d) outputting the characterization;
- e) making a decision for well placement based on the characterization;
- and
- f) steering drilling of the underground formation based on the decision for well placement.
An apparatus for geosteering while drilling an underground formation, comprising:
- a drilling member;
- at least one sensor for transmitting and receiving acoustic signals in a drilling borehole;
- a downhole steering unit;
- and
- a downhole electronics unit having a processor and a memory, wherein the memory stores a program having instructions for:
- a) transmitting and receiving acoustic signals in the borehole;
- b) processing the received acoustic signals to obtain at least one attribute of formation mobility;
- c) giving a characterization of fluid based on a change of the at least one attribute;
- d) outputting the characterization;
- e) making a decision for well placement based on the characterization;
- and
- f) steering the drilling member in the underground formation based on the decision for well placement.
Dependencies are inferred from the claim text.