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System and methods of deriving fluid properties of downhole fluids and uncertainty thereof

A technology of fluid properties and certainty, applied in the direction of earthwork drilling and production, wellbore/well components, etc., can solve problems caused by problems, and achieve robust and accurate comparison results

Inactive Publication Date: 2007-01-17
SCHLUMBERGER OVERSEAS SA
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  • Claims
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Problems solved by technology

However, characterizing reservoir properties for zoning based solely on pressure transfer creates problems and thus often yields unacceptable results

Method used

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  • System and methods of deriving fluid properties of downhole fluids and uncertainty thereof
  • System and methods of deriving fluid properties of downhole fluids and uncertainty thereof
  • System and methods of deriving fluid properties of downhole fluids and uncertainty thereof

Examples

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example 1

[0115] Figure 5The optical absorption spectra of three fluids obtained in the laboratory are shown in : formation fluids A and B (blue and red traces) with GOR of 500 and 1700 scf / stb, respectively, and a mud filtrate (green trace). In a first simulation, two formation fluids were contaminated with decreasing amounts of contamination to simulate cleanup of the formation fluids. Different contamination models were used for the two fluids. At the end of several hours, the true contamination of fluid A is 20% and the true contamination of fluid B is 2%, as Figure 6A and 6B Shown by the black trace in . Hereinafter, this simulation is referred to as "Simulation A" for further reference. Data were analyzed using the Contamination OCM algorithm described in Equations 1.1 to 1.9 above.

[0116] Since the pollution model used during the analysis is very different from the pollution model used in the simulation, the final pollution level estimated by the algorithm is biased. S...

example 2

[0118] In a second simulation (hereinafter referred to as Simulation B), two data sets were simulated from the same formation fluid (Fluid B from previous Simulation A) using different contamination models. Call these two new fluids fluids C and D, respectively. At the end of a few hours, the true contamination for fluid C is 9.3%, and the true contamination for fluid D is 1%, as Figure 8A and 8B Shown by the black trace in . This data was analyzed using the Contamination OCM algorithm described above in Equations 1.1 to 1.9. The final contamination levels of the two fluids were estimated at 6.3% and 1.8%, respectively, with an uncertainty of about 2%. As before, the pollution model provides a biased estimate of the pollution because the model used for the analysis differs from the model used to simulate the pollution. For the two fluids the measured data (blue and red traces as dotted lines) and the corresponding predicted gas-bearing fluid spectra (blue and red traces a...

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Abstract

Methods and systems are provided for downhole analysis of formation fluids by deriving fluid properties and associated uncertainty in the predicted fluid properties based on downhole data, and generating answer products of interest based on differences in the fluid properties. Measured data are used to compute levels of contamination in downhole fluids using an oil-base mud contamination monitoring (OCM) algorithm. Fluid properties are predicted for the fluids and uncertainties in predicted fluid properties are derived. A statistical framework is provided for comparing the fluids to generate, in real-time, robust answer products relating to the formation fluids and reservoirs thereof. Systematic errors in measured data are reduced or eliminated by preferred sampling procedures.

Description

technical field [0001] The present invention relates to formation fluid analysis for evaluating and testing geological formations for the purpose of exploring and developing hydrocarbon producing wells such as oil or gas wells. In particular, the present invention is directed to systems and methods for deriving fluid properties of formation fluids from downhole spectroscopic measurements. Background technique [0002] Downhole fluid analysis (DFA) is an important and efficient investigative technique commonly used to determine the characteristics and nature of geological formations with hydrocarbon deposits. DFA is used in oilfield exploration and development to determine the petrophysical, mineralogical, and fluid properties of hydrocarbon reservoirs. DFA is a type of reservoir fluid analysis that includes composition, fluid properties, and phase behavior of downhole fluids for characterizing hydrocarbon fluids and reservoirs. [0003] Typically, complex mixtures of fluid...

Claims

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Application Information

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IPC IPC(8): E21B49/08
Inventor 拉利萨·文卡塔拉马南藤泽刚巴瓦尼·拉格休拉曼奥利弗·C·马林斯安德鲁·卡尼吉里卡多·瓦斯克斯董成利许凯迈克尔·奥基夫亨利-皮埃尔·瓦莱罗
Owner SCHLUMBERGER OVERSEAS SA
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