Back to results
US 12,560,084 B2Granted
System and method for contamination monitoring
AssigneeSchlumberger Technology Corporation
InventorsKai Hsu, Thomas Pfeiffer, Kang Wang, Dan Schulz, Morten Kristensen, Youxiang Zuo
Life of this patent
Estimating the term…
Abstract
A method includes receiving first fluid property data from a sample flowline of a focused sampling system and receiving second fluid property data from a guard flowline of the focused sampling system. The sample flowline and the guard flowline are each configured to sample formation fluid from a hydrocarbon reservoir, the formation fluid includes native formation fluid and a contaminant, and the first fluid property data includes an optical density of the native formation fluid and the second fluid property data includes an optical density of the contaminant
Claims20
A method comprising:
- receiving, using a first sensor coupled to a sample flowline of a focused sampling system, first optical density data of a native formation fluid drawn into the sample flowline from a hydrocarbon reservoir via a first pump;
- receiving, using a second sensor coupled to a guard flowline of the focused sampling system, second optical density data of a contaminant fluid drawn into the guard flowline from the hydrocarbon reservoir via a second pump;
- combining the first optical density data and the second optical density data to generate combined optical density data;
- determining a derivative of the combined optical density data as a function of pumped volume of the native formation fluid through the sample flowline and the contaminant fluid through the guard flowline;
- performing a linear analysis based on the combined optical density data with respect to the derivative of the combined optical density data to determine an intercept, wherein the linear analysis includes a fitting of the combined optical density data with the derivative of the combined optical density data multiplied by pumped volume, and wherein the fitting includes a weighted least squares algorithm that assigns higher weights to most recent data points of the combined optical density data and the derivative of the combined optical density data multiplied by pumped volume;
- estimating a contamination profile of the native formation fluid based on the intercept and the combined optical density data;
- and
- adjusting, by an electronic controller based at least in part on the contamination profile, the first pump to adjust a native fluid flow rate of the native formation fluid through the sample flowline or the second pump to adjust a contaminant fluid flow rate of the contaminant fluid through the guard flowline.
5 more elements
A focused sampling system, comprising:
- a sample flowline;
- a first pump coupled with the sample flowline, the first pump configured to draw a native formation fluid into the sample flowline from a hydrocarbon reservoir;
- a guard flowline;
- a second pump coupled with the guard flowline, the second pump configured to draw a contaminant fluid into the guard flowline from the hydrocarbon reservoir;
- a first sensor coupled to the sample flowline and configured to generate first feedback indicative of a first optical density of the native formation fluid drawn into the sample flowline by the first pump;
- a second sensor coupled to the guard flowline and configured to generate second feedback indicative of a second optical density of the contaminant fluid drawn into the guard flowline by the second pump;
- and
- a controller communicatively coupled to the first sensor and the second sensor, the controller configured to:
- receive the first feedback and the second feedback;
- combine the first optical density of the native formation fluid and the second optical density of the contaminant fluid to generate combined optical density data;
- determine a derivative of the combined optical density data as a function of pumped volume of the native formation fluid through the sample flowline and the contaminant fluid through the guard flowline;
- perform linear analysis on the combined optical density data with respect to the derivative of the combined optical density data to determine an intercept, wherein the linear analysis includes a fitting of the combined optical density data with the derivative of the combined optical density data multiplied by pumped volume, and wherein the fitting includes a weighted least squares algorithm that assigns higher weights to most recent data points of the combined optical density data and the derivative of the combined optical density data multiplied by pumped volume;
- estimate a contamination profile of the native formation fluid based on the intercept and the combined optical density data;
- and
- adjust, based at least in part on the contamination profile, the first pump to adjust a native fluid flow rate of the native formation fluid through the sample flowline or the second pump to adjust a contaminant fluid flow rate of the contaminant fluid through the guard flowline.
12 more elements
A method, comprising:
- receiving from a first sensor coupled to a sample flowline of a focused sampling system, a plurality of first data points associated with a native formation fluid pumped through the sample flowline via a first pump, wherein the plurality of first data points are indicative of a first optical density of the native formation fluid as a first function of pumped volume of the native formation fluid through the sample flowline;
- receiving from a second sensor coupled to a guard flowline of the focused sampling system, a plurality of second data points associated with a contaminant fluid pumped through the guard flowline via a second pump, wherein the plurality of second data points are indicative of a second optical density of the contaminant fluid as a second function of pumped volume of the contaminant fluid through the guard flowline;
- combining the plurality of first data points and the plurality of second data points to generate combined data;
- calculating a derivative of the combined data over the pumped volume of the native formation fluid through the sample flowline, the pumped volume of the contaminant fluid through the guard flowline, or both;
- performing a linear analysis based on the combined data with respect to the derivative of the combined data to determine an intercept, wherein the linear analysis includes a fitting of the combined data with the derivative of the combined data multiplied by pumped volume, and wherein the fitting includes a weighted least squares algorithm that assigns higher weights to most recent data points of the combined data and the derivative of the combined data multiplied by pumped volume;
- receiving a measured optical density of the contaminant fluid;
- estimating a contamination profile of the native formation fluid based on the intercept and the measured optical density of the contaminant fluid;
- and
- adjusting, by an electronic controller based at least in part on the contamination profile, the first pump to adjust a native fluid flow rate of the native formation fluid through the sample flowline or the second pump to adjust a contaminant fluid flow rate of the contaminant fluid through the guard flowline.
6 more elements
Dependencies are inferred from the claim text.