Method of determining a formation parameter

Patent metadata

Field	Value
Publication number	US-9322948-B2
Application number	US-201213414302-A
Country	US
Kind code	B2
Filing date	Mar 7, 2012
Priority date	Mar 7, 2012
Publication date	Apr 26, 2016
Grant date	Apr 26, 2016

Abstract

A method of measuring a formation parameter in the process of drilling a well penetrating the rock formation is disclosed. A section of the well is provided with a drill string comprising a drilling bit at its distal end; a first fluid is circulated through the drilling bit and invades the rock formation; a formation evaluation tool mounted onto the drill string is used to measure the formation parameter; the formation parameter is used to select the time at which a second fluid is circulated through the drilling bit; such that the second fluid alters the response of the rock formation to the formation evaluation tool; the second fluid is circulated through the drilling bit to start invading the formation; and the formation evaluation tool is used to repeat the measure of the formation parameter while circulating the second fluid.

First claim

What is claimed is:

1. A method of measuring a formation parameter of a rock formation in the process of drilling a well penetrating the rock formation, comprising:
providing a section of the well with a drill string comprising a drilling bit at a distal end of the drill string;
circulating a first fluid through the drilling bit, said first fluid invading the rock formation surrounding the well;
using a formation evaluation tool mounted onto the drill string to measure the formation parameter;
selecting a time at which a second fluid is started to circulate through the drilling bit, such that the second fluid alters a response of the rock formation to the formation evaluation tool;
circulating the second fluid through the drilling bit to start invading the formation surrounding the well; and
using the formation evaluation tool to re-measure said formation parameter while circulating said second fluid.

2. A method in accordance with claim 1 , further comprising removing layers from a wall of a section prior to circulating the second fluid.

3. A method in accordance with claim 1 , wherein the rock formation includes hydrocarbon bearing rock.

4. A method in accordance with claim 1 , wherein the formation evaluation tool is selected from a group comprising nuclear magnetic resonance tools, neutron scattering or capturing tools, sonic tools and resistivity tools.

5. A method in accordance with claim 1 , wherein the first fluid is a drilling fluid.

6. A method in accordance with claim 1 , wherein the second fluid comprises a component miscible with either hydrocarbon or water.

7. A method in accordance with claim 1 , wherein the second fluid comprises a paramagnetic material altering the response of the rock formation to the formation evaluation tool.

8. A method in accordance with claim 7 , wherein the paramagnetic material comprises manganese, chromium.

9. A method in accordance with claim 1 , wherein the second fluid comprises chlorine.

10. A method in accordance with claim 1 , further comprising using the formation evaluation tool to perform a time series measurement of the parameter while circulating the second fluid.

Assignees

• Ramamoorthy Raghu
• Clerke Edward Alan
• Schlumberger Technology Corp
• Saudi Aramco Oil Company

Inventors

• Ramamoorthy Raghu
• Clerke Edward Alan

Classifications

• G01V5/04 Primary

  specially adapted for well-logging · CPC title

• E21B49/00

  Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells · CPC title