Measuring an adsorbing chemical in downhole fluids
AssigneeHalliburton Energy Services, Inc.
InventorsChristopher M. Jones, Michael T. Pelletier, Mark Proett
Life of this patent
Estimating the term…
Abstract
Interaction of adsorbing chemicals with a downhole tool presents inaccuracies in the adsorbing chemical measurement and analysis. The principles of the present disclosure provide a method and system of sampling fluids including an adsorbing chemical in a subterranean reservoir. One method may include modeling an interaction between the adsorbing chemical and a downhole tool, applying the model to a measurement of the adsorbing chemical, and adjusting the measurement in response to applying the model.
Claims21
1-20. (canceled)
A method to detect a chemical in a subterranean reservoir comprising:
- simulating behavior of a chemical as the chemical moves from a reservoir to a location within a downhole tool;
- based on the simulation, using mathematical fitting to generate a model of the behavior;
- using the downhole tool, sampling a downhole fluid containing the chemical;
- characterizing a response of the downhole tool to the chemical using the model;
- and
- operating the downhole tool in response to the characterization.
The method as defined in claim 1, wherein:
- the model is matched to downhole test data;
- the model is comprised of a gaussian model, exponential model, or double exponential model;
- the model is derived from an approximation;
- or
- the model comprises an error function.
The method as defined in claim 1, wherein the downhole tool is a formation tester, a fluid identification or contamination section of a downhole tool or a nuclear magnetic resonance (“NMR”) section of a downhole tool.
The method as defined in claim 1, wherein:
- the simulation is a numeric simulation or finite element simulation;
- or
- the simulation is performed as part of a pre-job operation.
The method as defined in claim 1, wherein:
- the model is adjusted while the downhole tool is downhole;
- or
- the model is used to determine a concentration of the chemical in the downhole fluid.
The method as defined in claim 1, wherein:
- the chemical is at least one of H2S, mercury, CO2, tracer, water scaling chemical, sulfur containing species, a mercaptian, filtrate tracer, a radioactive tracer, Tritium, a bromide compound, an iodide compound, a fatty acid or Nitrate anion;
- or
- the chemical is a corrosive or adsorbing chemical.
The method as defined in claim 1, wherein:
- the chemical is detected optically, electrically or chemically;
- or
- the chemical is detected using a Gas Chromatograph, sulfur detector or nuclear magnetic resonance (“NMR”) device.
The method as defined in claim 1, wherein operating the downhole tool comprises predicting, planning or adjusting in real-time a sampling job in response to the characterization.
The method as defined in claim 1, wherein:
- the simulation uses at least one of a composition, temperature, pressure, fluid flow rate or formation tester configuration;
- or
- the simulation is a steady state model.
A tool for sampling fluids including a chemical in a subterranean reservoir, comprising:
- a formation tester having a sampling chamber;
- and
- a processor coupled to the formation tester to perform operations comprising:
- simulating behavior of a chemical as the chemical moves from a reservoir to the sampling chamber;
- based on the simulation, using mathematical fitting to generate a model of the behavior;
- using the formation tester, sampling a downhole fluid containing the chemical;
- characterizing a response of the formation tester to the chemical using the model;
- and
- operating the formation tester in response to the characterization.
The tool as defined in claim 18, wherein:
- the model is matched to downhole test data;
- the model is comprised of a gaussian model, exponential model, or double exponential model;
- the model is derived from an approximation;
- or
- the model comprises an error function.
The tool as defined in claim 18, wherein:
- the simulation is a numeric simulation or finite element simulation;
- or
- the simulation is performed as part of a pre-job operation.
The tool as defined in claim 18, wherein the model is adjusted while the downhole tool is downhole.
The tool as defined in claim 18, wherein:
- the chemical is at least one of H2S, mercury, CO2, tracer, water scaling chemical, sulfur containing species, a mercaptian, filtrate tracer, a radioactive tracer, Tritium, a bromide compound, an iodide compound, a fatty acid or Nitrate anion;
- or
- the chemical is a corrosive or adsorbing chemical.
The tool as defined in claim 18, wherein the chemical is detected optically, electrically or chemically.
The tool as defined in claim 18, wherein:
- a detector for detecting the chemical is located proximal to the sampling chamber;
- the detector is a Gas Chromatograph, sulfur detector or nuclear magnetic resonance (“NMR”) detector.
The tool as defined in claim 18, wherein operating the downhole tool comprises predicting, planning or adjusting in real-time a sampling job in response to the characterization.
The tool as defined in claim 18, wherein the model is used to determine a concentration of the chemical in the downhole fluid.
The tool as defined in claim 18, wherein the simulation uses at least one of a composition, temperature, pressure, fluid flow rate or formation tester configuration.
The tool as defined in claim 18, wherein the simulation is a steady state model.
Dependencies are inferred from the claim text.