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US 12,742,387 B2Granted
Validation for reservoir flow during formation testing
AssigneeHalliburton Energy Services, Inc.
InventorMehdi Ali Pour Kallehbasti
Life of this patent
Estimating the term…
Abstract
Disclosed herein are systems and methods to obtain representative formation pore pressure and formation mobility from pressure measurements with a formation testing tool. One of the methods for performing a pressure test includes measuring the pressure in the fluid passageway by a pressure sensor, performing a pre-test with the pressure sensor, measuring the drawdown pressure, measuring the buildup pressure, performing another pre-test when the drawdown pressure is superior to the buildup pressure, and validating a formation flow when the drawdown pressure is equal to the buildup pressure, wherein a measured pressure obtained at an asymptote of a pressure curve after the buildup pressure corresponds to the formation pore pressure.
Claims20
A method for performing a pressure test comprising:
- inserting a formation testing tool into a wellbore, wherein the formation testing tool includes:
- at least one probe;
- a pump disposed within the formation testing tool and connected to the at least one probe by at least one probe channel and at least one fluid passageway;
- and
- identifying parameters of the formation testing tool;
- activating the at least one probe, wherein the at least one probe is activated into a mudcake, wherein the mudcake is disposed on a surface of the wellbore;
- activating the pump, wherein a formation fluid is drawn in through the at least one probe into the at least one probe channel and the at least one fluid passageway by the pump and increasing pressure with the at least one fluid passageway;
- measuring the pressure in the at least one fluid passageway by a pressure sensor;
- performing a pre-test with the pressure sensor;
- estimating a drawdown pressure by comparing at least two pressure measurements;
- estimating a buildup pressure by comparing at least two pressure measurements;
- performing an additional test if the buildup pressure does not meet a predefined criteria with respect to the drawdown pressure;
- and
- validating a formation flow.
11 more elements
A method for performing a pressure test comprising:
- inserting a formation testing tool into a wellbore, wherein the formation testing tool includes:
- at least one probe;
- a pump disposed within the formation testing tool and connected to the at least one probe by at least one probe channel and at least one fluid passageway;
- and
- at least one stabilizer disposed on an opposite side of the formation testing tool as the at least one probe;
- identifying parameters of the formation testing tool;
- activating the at least one stabilizer, wherein the at least one stabilizer is activated into a surface of the wellbore;
- activating the at least one probe, wherein the at least one probe is activated into a mudcake, wherein the mudcake is disposed on the surface of the wellbore;
- activating the pump, wherein a formation fluid is drawn in through the at least one probe into the at least one probe channel and the at least one fluid passageway by the pump and increasing pressure with the at least one fluid passageway;
- measuring the pressure in the at least one fluid passageway by a pressure sensor;
- performing a first pre-test with the pressure sensor;
- estimating a drawdown pressure by comparing at least two pressure measurements;
- measuring a buildup pressure by comparing at least two pressure measurements;
- performing an additional test if the buildup pressure does not meet a predefined criteria with respect to the drawdown pressure;
- and
- validating a formation flow.
13 more elements
A method for performing a pressure test comprising:
- Inserting a formation testing tool into a wellbore, wherein the formation testing tool includes:
- at least one probe;
- a pump disposed within the formation testing tool and connected to the at least one probe by at least one probe channel and at least one fluid passageway;
- at least one stabilizer disposed on an opposite side of the formation testing tool as the at least one probe;
- identifying parameters of the formation testing tool;
- activating the at least one stabilizer, wherein the at least one stabilizer is activated in a surface of the wellbore;
- activating the at least one probe, wherein the at least one probe is activated into a mudcake, wherein the mudcake is disposed on the surface of the wellbore:
- activating the pump, wherein a formation fluid is drawn in through the at least one probe into the at least one probe channel and the at least one fluid passageway by the pump and increasing pressure with the at least one fluid passageway:
- measuring the pressure in the at least one fluid passageway by a pressure sensor:
- performing a first pre-test with the pressure sensor;
- estimating a drawdown pressure and measuring a rate of pressure change during a first drawdown period;
- estimating a buildup pressure and measuring a rate of pressure change during a first buildup period;
- performing an additional pre-test if the estimated drawdown pressure is greater than the estimated buildup pressure;
- estimating a drawdown pressure and measuring a rate of pressure change during a second drawdown period;
- and
- validating a formation flow if the rate of pressure change during the first drawdown period is equal or close to the rate of pressure change during the second drawdown period.
13 more elements
Dependencies are inferred from the claim text.