US 12,110,790 B2Granted

Method and system for estimating a depth pressure and/or permeability profile of a geological formation having a well

AssigneeTotalenergies Onetech

InventorsAntoine Jacques, Benoit Brouard, Vincent Jaffrezic

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Abstract

A method for estimating a depth pressure and/or permeability profile of a geological formation having a well extending between a first end and a second end includes equipping the well with an inner tube defining an inner space and an annular space; performing a first well closing phase by injecting a second fluid having a higher viscosity than a first fluid in the well while extracting under a first constant pressure value; performing a second well closing phase by injecting the second fluid while extracting the first fluid under a second constant pressure value, different from the first constant pressure value; and estimating the depth pressure and/or permeability profile of the geological formation based on measurements performed during the first well closing phase and the second well closing phase.

Claims16

Dependent claims

An estimating method for estimating a depth pressure and/or permeability profile of a geological formation, wherein a well extends in the geological formation between a first end and a second end, said method comprising:

equipping the well with an inner tube which extends between the first end of the well and towards the second end of the well, wherein said inner tube defines an inner space and an annular space in fluid communication towards the second end of the well,
performing, when the annular space of the well is filled with a first fluid, a first well closing phase by injecting, into the inner space at the first end, a second fluid having a higher viscosity than the first fluid while extracting, from the annular space at the first end, the first fluid under a first constant pressure value in the annular space at the first end, wherein the first well closing phase comprises measuring a first temporal injection flowrate profile of the second fluid, a first temporal extraction flowrate profile of the first fluid, and a first temporal pressure profile in the inner space at the first end;
performing, when the annular space of the well is filled with the first fluid, a second well closing phase by injecting, into the inner space at the first end, the second fluid while extracting, from the annular space at the first end, the first fluid under a second constant pressure value in the annular space at the first end, wherein the second constant pressure value is different from the first constant pressure value, wherein the second well closing phase comprises measuring a second temporal injection flowrate profile of the second fluid, a second temporal extraction flowrate profile of the first fluid, and a second temporal pressure profile in the inner space at the first end;
and
estimating the depth pressure and/or permeability profile of the geological formation based on the measurements performed during the first well closing phase and the second well closing phase.

2 more elements

System A system for estimating a depth pressure and/or permeability profile of a geological formation, wherein a well extends in the geological formation between a first end and a second end, said well is equipped with an inner tube which extends between the first end of the well and towards the second end of the well, and said tube defines an inner space and an annular space in fluid communication towards the second end of the well, wherein the system comprises:

means configured to perform, when the annular space of the well is filled with a first fluid, a first well closing phase by injecting, into the inner space at the first end, a second fluid having a higher viscosity than the first fluid while extracting, from the annular space at the first end, the first fluid under a first constant pressure value in the annular space at the first end, wherein the first well closing phase comprises measuring a first temporal injection flowrate profile of the second fluid, a first temporal extraction flowrate profile of the first fluid, and a first temporal pressure profile in the inner space at the first end;
means configured to perform, when the annular space of the well is filled with the first fluid, a second well closing phase by injecting, into the inner space at the first end, the second fluid while extracting, from the annular space at the first end, the first fluid under a second constant pressure value in the annular space at the first end, wherein the second constant pressure value is different from the first constant pressure value, wherein the second well closing phase comprises measuring a second temporal injection flowrate profile of the second fluid, a second temporal extraction flowrate profile of the first fluid, and a second temporal pressure profile in the inner space at the first end;
and
means configured to estimate the depth pressure and/or permeability profile of the geological formation based on the measurements performed during the first well closing phase and the second well closing phase.

1 more element

Dependencies are inferred from the claim text.