Nmr logging interpretation of solid invasion
AssigneeBaker Hughes, A Ge Company, LLC
InventorJinhong Chen
Life of this patent
Estimating the term…
Abstract
A method for estimating an effect on nuclear magnetic resonance (NMR) measurements of an invasion of solid particles into pores of an earth formation penetrated by a borehole includes conveying a carrier through the borehole and performing an NMR measurement on a volume of interest in the formation to provide a relaxation time constant using an NMR tool disposed at the carrier. The method further includes receiving information describing the solid particles in the pores and quantifying, using a processor, an effect on the measured relaxation time constant due to the invasion of solid particles using the received information.
Claims18
A method for estimating an effect on nuclear magnetic resonance (NMR) measurements of an invasion of solid particles into pores of an earth formation penetrated by a borehole, the method comprising:
- conveying a carrier through the borehole;
- performing an NMR measurement on a volume of interest in the formation to provide a relaxation time constant using an NMR tool disposed at the carrier;
- receiving information describing the solid particles in the pores, the information comprising a shape property of the solid particles;
- quantifying, using a processor, the effect on the measured relaxation time constant due to the invasion of the solid particles using the received information;
- correcting the NMR measurement by the processor using the quantified effect to provide corrected NMR output;
- and
- operating drilling or production resources in response to a parameter of the earth formation determined from the corrected NMR output having a value that provides input for operating the drilling or production resources.
An apparatus for estimating an effect on nuclear magnetic resonance (NMR) measurements of an invasion of solid particles into pores of an earth formation penetrated by a borehole, the apparatus comprising:
- a carrier configured to be conveyed through the borehole;
- a NMR tool disposed at the carrier and configured to perform a NMR measurement on a volume of interest in the formation to provide a relaxation time constant;
- and
- a processor configured to:
- receive information describing the solid particles in the pores, the information comprising a shape property of the solid particles;
- quantify an effect on the measured relaxation time constant due to the invasion of solid particles using the received information;
- correct NMR measurements using the quantified effect to provide corrected NMR output;
- a drilling or production resource configured to be operated in response to a parameter of the earth formation determined from the corrected NMR output having a value that provides input for operating the drilling or production resources.
Dependencies are inferred from the claim text.