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    PROCESSES AND SYSTEMS FOR DETERMINING IF DOWNHOLE FLUIDS ARE IN EQUILIBRIUM OR NON-EQUILIBRIUM
    11.
    发明公开
    PROCESSES AND SYSTEMS FOR DETERMINING IF DOWNHOLE FLUIDS ARE IN EQUILIBRIUM OR NON-EQUILIBRIUM 审中-公开

    公开(公告)号：US20230349881A1

    公开(公告)日：2023-11-02

    申请号：US18043616

    申请日：2021-09-02

    Applicant: Schlumberger Technology Corporation

    Inventor： Melanie Jensen ,  Lalitha Venkataramanan ,  Sandip Bose ,  Peter Tilke ,  Oliver C. Mullins ,  Li Chen ,  Denise E. Freed

    IPC: G01N33/28 ,  E21B49/08

    CPC classification number: G01N33/2823 ,  E21B49/081

    Abstract: Processes and systems for determining asphaltene equilibrium between two or more downhole geographic locations are provided. In some embodiments, the process can include measuring one or more fluid properties of a plurality of fluid samples at varying downhole depths to generate a one or more downhole fluid analysis measurement data points; selecting an asphaltene diameter distribution based on prior knowledge; utilizing the asphaltene diameter distribution to fit a first set of one or more equation of state curves to the one or more downhole fluid analysis measurement data points to define a first model of fitted equation of state curves and to determine one or more posterior distributions of asphaltene diameters; and determining if the varying downhole depths are in an asphaltene equilibrium by determining whether the one or more posterior distributions of asphaltene diameters is consistent with that of asphaltenes in equilibrium.

    Fluid analysis methods and apparatus for determining gas-oil ratio
    13.
    发明授权
    Fluid analysis methods and apparatus for determining gas-oil ratio 有权

    公开(公告)号：US10605797B2

    公开(公告)日：2020-03-31

    申请号：US14620659

    申请日：2015-02-12

    Applicant: Schlumberger Technology Corporation

    Inventor： Youxiang Zuo ,  Vinay K. Mishra ,  Oliver C. Mullins

    IPC: E21B49/08 ,  G01N33/28

    Abstract: The present disclosure relates to methods and apparatus for determining a gas-oil ratio based on downhole fluid analysis measurements and calibrated gas-oil ratio parameters. According to certain embodiments, the parameters for calculating the gas-oil ratio may be calibrated using historical data from the reservoir. For example, previously determined gas-oil ratios may be employed to calibrate the parameters to the reservoir. The calibrated parameters may then be employed during sampling operations to determine the gas-oil ratio.

    Tar mat formation prediction in late-charge reservoirs
    14.
    发明授权
    Tar mat formation prediction in late-charge reservoirs 有权

    公开(公告)号：US10392936B2

    公开(公告)日：2019-08-27

    申请号：US15279828

    申请日：2016-09-29

    Applicant: Schlumberger Technology Corporation

    Inventor： Shu Pan ,  Youxiang Zuo ,  Yi Chen ,  Kang Wang ,  Oliver C. Mullins

    IPC: E21B43/00 ,  E21B49/08 ,  E21B49/10 ,  G01V11/00 ,  G06F17/10 ,  G01V7/00

    Abstract: A downhole tool, surface equipment, and/or remote equipment are utilized to obtain data associated with a subterranean hydrocarbon reservoir, fluid contained therein, and/or fluid obtained therefrom. At least one condition indicating that a density inversion exists in the fluid contained in the reservoir is identified from the data. Molecular sizes of fluid components contained within the reservoir are estimated from the data. A model of the density inversion is generated based on the data and molecular sizes. The density inversion model is utilized to estimate the density inversion amount and depth and time elapsed since the density inversion began to form within the reservoir. A model of a gravity-induced current of the density inversion is generated based on the data and the density inversion amount, depth, and elapsed time.

    Evaluating reservoir oil biodegradation
    16.
    发明授权
    Evaluating reservoir oil biodegradation 有权

    公开(公告)号：US10330665B2

    公开(公告)日：2019-06-25

    申请号：US14933807

    申请日：2015-11-05

    Applicant: Schlumberger Technology Corporation

    Inventor： Youxiang Zuo ,  Oliver C. Mullins ,  Richard Jackson ,  Ankit Agarwal

    IPC: E21B49/08 ,  G01N33/28

    Abstract: Upper and lower asphaltene weight fractions of fluid proximate ends of an oil column are obtained based on measured OD. Upper and lower maltene partial densities are obtained based on the asphaltene weight fractions. A maltene partial density distribution is obtained utilizing the maltene partial densities and a predetermined diffusion model. An asphaltene partial density distribution is obtained based on the maltene partial density distribution and an estimated mass density gradient. An asphaltene weight percentage is obtained based on the asphaltene partial density distribution and the mass density gradient. The asphaltene weight percentage distribution is converted to an OD distribution utilizing a predetermined correlation. An optimization then reduces differences between the OD distribution and the measured OD data to within a predetermined range to refine a biodegradation time of the predetermined diffusion model. A viscosity distribution may be obtained based on the optimized OD distribution.

    Combining downhole fluid analysis and petroleum systems modeling
    17.
    发明授权
    Combining downhole fluid analysis and petroleum systems modeling 有权

    公开(公告)号：US10083258B2

    公开(公告)日：2018-09-25

    申请号：US14483854

    申请日：2014-09-11

    Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION

    Inventor： Armin I. Kauerauf ,  Daniel Bruno Palmowski ,  Thomas Hantschel ,  Oliver C. Mullins

    IPC: G06F17/50 ,  G01V1/40 ,  G01V99/00

    CPC classification number: G06F17/5009 ,  G01V1/40 ,  G01V99/005

    Abstract: A method for performing a field operation within a geologic basin having rock formations and a reservoir that includes fluids includes generating, by forward modeling using a petroleum system model (PSM), an estimate of a fluid property distribution of a fluid within the reservoir of the geologic basin. The method further includes detecting, from fluid samples, a fluid property gradient within the geologic basin. The fluid samples are extracted from within at least one wellbore drilled through the rock formations. The method further includes, comparing the estimate of the fluid property distribution with the detected fluid property gradient to generate a comparison result, iteratively adjusting, based on the comparison result, the PSM to generate an adjusted PSM, and performing, based on the adjusted PSM, the field operation within the geologic basin.

    Asphaltene Phase Instability Analysis in Gas Charges into Oil Reservoirs
    18.
    发明申请
    Asphaltene Phase Instability Analysis in Gas Charges into Oil Reservoirs 审中-公开

    公开(公告)号：US20180004863A1

    公开(公告)日：2018-01-04

    申请号：US15196128

    申请日：2016-06-29

    Applicant: Schlumberger Technology Corporation

    Inventor： Youxiang Zuo ,  Shu Pan ,  Yi Chen ,  Kang Wang ,  Oliver C. Mullins

    IPC: G06F17/50 ,  G06F17/11

    CPC classification number: G06F17/5009 ,  E21B49/082 ,  G06F2217/16

    Abstract: A method includes placing a downhole acquisition tool in a wellbore in a geological formation containing a reservoir fluid. The method includes performing downhole fluid analysis using the downhole acquisition tool to determine at least one measurement of the reservoir fluid. The method includes using a processor to estimate at least one fluid component property by using an equation of state based at least in part on the at least one measurement of the reservoir fluid and to simulate a diffusion process using a diffusion model that takes into account the at least one estimated fluid property to generate a composition path. The method includes using a processor to estimate one or more phase envelopes based in part on the at least one fluid property and compare the one or more phase envelopes with the composition path. The method includes outputting a visualization identify potential areas of asphaltene instability.

    Assessing Reservoir Connectivity In Hydrocarbon Reservoirs
    20.
    发明申请
    Assessing Reservoir Connectivity In Hydrocarbon Reservoirs 有权
    评估油气藏中的油藏连通性

    公开(公告)号：US20150136962A1

    公开(公告)日：2015-05-21

    申请号：US14406516

    申请日：2013-03-07

    Applicant: Schlumberger Technology Corporation

    Inventor： Andrew E. Pomerantz ,  Youxiang Zuo ,  Oliver C. Mullins

    IPC: E21B49/08 ,  G01N21/64

    CPC classification number: E21B49/088 ,  E21B7/10 ,  E21B47/00 ,  E21B47/10 ,  E21B49/00 ,  E21B49/02 ,  E21B49/082 ,  G01N21/64 ,  G01N2201/12

    Abstract: A method is disclosed for assessing connectivity between sections in a hydrocarbon reservoir. Samples of hydrocarbons are collected over different depths in at least one wellbore. Fluorescence intensity determines the actual heavy end concentrations of hydrocarbons for the corresponding COLLECT GAS CONDENSATE different depths. Estimated heavy end concentrations of hydrocarbons for corresponding different depths are determined and the actual heavy end concentrations of hydrocarbons are compared with the estimated heavy end concentrations to assess connectivity between sections of the hydrocarbon reservoir.

    Abstract translation: 公开了一种用于评估碳氢化合物油藏中各段之间连通性的方法。 在至少一个井眼中不同深度收集烃的样品。 荧光强度决定了相应的COLLECT GAS CONDENSATE不同深度的烃的实际重端浓度。 确定相应不同深度的烃的重质末端浓度，并将烃的实际重馏分浓度与估计的重尾浓度进行比较，以评估烃储层断面之间的连通性。

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