Multi-parameter inversion through offset dependent elastic FWI

    公开(公告)号:US09702993B2

    公开(公告)日:2017-07-11

    申请号:US14272020

    申请日:2014-05-07

    IPC分类号: G01V1/28 G01V1/30

    摘要: Method for multi-parameter inversion using elastic inversion. This method decomposes data into offset/angle groups and performs inversion on them in sequential order. This method can significantly speed up convergence of the iterative inversion process, and is therefore most advantageous when used for full waveform inversion (FWI). The present inventive approach draws upon relationships between reflection energy and reflection angle, or equivalently, offset dependence in elastic FWI. The invention uses recognition that the amplitudes of small angle (near offset) reflections are largely determined by acoustic impedance alone (1), independent for the most part of Vp/Vs. Large angle (middle and far offset) reflections are affected by Ip, Vp/Vs (2) and other earth parameters such as density (3) and anisotropy. Therefore, the present inventive method decomposes data into angle or offset groups in performing multi-parameter FWI to reduce crosstalk between the different model parameters being determined in the inversion.

    Method and system for partitioning parallel simulation models
    2.
    发明授权
    Method and system for partitioning parallel simulation models 有权
    分割并行仿真模型的方法和系统

    公开(公告)号:US09594186B2

    公开(公告)日:2017-03-14

    申请号:US13509527

    申请日:2010-10-19

    摘要: A method is presented for partitioning a simulation model into a plurality of subdomains that may each be assigned to one of a plurality of processors. The method includes creating a representation of a topology graph of a simulation model in a tangible, computer readable medium. The topology graph includes a plurality of computational elements and a plurality of connections between those elements. Each of the plurality of connections is weighted to create a plurality of weights, and each of the plurality of weights is scaled. Optionally, the weights can be mapped to different interval of values. Based on the weights information the topology graph is partitioned into two or more subdomains, wherein a partition boundary follows a local topographical minimum in the topology graph. A subdomain is assigned to each of the plurality of processors.

    摘要翻译: 提出了一种用于将模拟模型分割成可以分配给多个处理器之一的多个子域的方法。 该方法包括在有形的计算机可读介质中创建仿真模型的拓扑图的表示。 拓扑图包括多个计算元件和这些元件之间的多个连接。 多个连接中的每一个被加权以创建多个权重,并且对多个权重中的每一个进行缩放。 可选地,可以将权重映射到不同的值间隔。 基于权重信息,拓扑图被分割成两个或多个子域,其中分区边界遵循拓扑图中的局部拓扑最小值。 子域被分配给多个处理器中的每一个。

    Residual moveout estimation through least squares inversion
    3.
    发明授权
    Residual moveout estimation through least squares inversion 有权
    通过最小二乘反演的残差估计

    公开(公告)号:US09482770B2

    公开(公告)日:2016-11-01

    申请号:US13403707

    申请日:2012-02-23

    申请人: Hongchuan Sun

    发明人: Hongchuan Sun

    CPC分类号: G01V1/30 G01V1/34 G06F17/50

    摘要: Method for estimating residual moveout in common image gathers (51) of seismic data for use in velocity tomography (57). The method iteratively (56) flattens (55) the common image gathers against a specified reference trace through the application of conjugate-gradient least-squares inversion (53). Different from other picking methods which need to identify and track strong amplitudes, the inventive method automatically inverts for the depth residual for every grid point in the image gather. There is no need to identify and track events.

    摘要翻译: 用于估计用于速度断层扫描的地震数据的共同图像采集(51)中的残余偏移的方法(57)。 迭代方法(56)通过应用共轭梯度最小二乘反演(53)平坦化(55)公共图像针对指定的参考轨迹进行收集。 与需要识别和跟踪强幅度的其他拾取方法不同,本发明的方法自动地反转图像聚集中的每个格点的深度残差。 没有必要识别和跟踪事件。

    System and method for high speed hydraulic actuation
    4.
    发明授权
    System and method for high speed hydraulic actuation 有权
    用于高速液压驱动的系统和方法

    公开(公告)号:US09347304B2

    公开(公告)日:2016-05-24

    申请号:US14237145

    申请日:2012-07-05

    摘要: There is provided a device and method for high speed hydraulic actuation. The method includes adjusting a position of an actuator using a hydraulic pressure regulator. Adjusting the position of the actuator includes increasing pressure on the hydraulic pressure regulator to open the actuator using a first solenoid, or decreasing pressure on the hydraulic pressure regulator to close the actuator using a second solenoid.

    摘要翻译: 提供了一种用于高速液压致动的装置和方法。 该方法包括使用液压调节器来调节致动器的位置。 调节致动器的位置包括增加液压调节器上的压力,以使用第一螺线管打开致动器,或减小液压调节器上的压力,以使用第二螺线管闭合致动器。

    Double hydraulic fracturing methods
    5.
    发明授权
    Double hydraulic fracturing methods 有权
    双水压裂法

    公开(公告)号:US09328600B2

    公开(公告)日:2016-05-03

    申请号:US13825107

    申请日:2011-10-19

    IPC分类号: E21B43/267

    CPC分类号: E21B43/267

    摘要: A method for hydraulically fracturing subterranean formations in a manner resulting in improved propping of fractures, particularly in ductile rock formations such as gas-containing shales having a high clay content. The method allows for improved hydrocarbon production. The method involves injecting a first fluid having a first proppant concentration into the subsurface formation to form a fracture, reducing the pressure in the fracture and allowing the fracture to substantially close, and injecting a second fluid having a second proppant concentration into the fracture to re-open the fracture. The second proppant concentration is greater than the first proppant concentration. A portion of the proppant is effectively retained in the reopened fracture.

    摘要翻译: 一种用于水力压裂地下地层的方法,导致改进的骨折支撑,特别是在延性岩层中,例如具有高粘土含量的含气页岩。 该方法允许改进碳氢化合物生产。 该方法包括将具有第一支撑剂浓度的第一流体注入到地下地层中以形成断裂,降低断裂中的压力并允许断裂基本上闭合,并将具有第二支撑剂浓度的第二流体注入裂缝中 打开骨折。 第二支撑剂浓度大于第一支撑剂浓度。 支撑剂的一部分被有效地保留在重新开放的骨折中。

    System and method for producing coal bed methane
    6.
    发明授权
    System and method for producing coal bed methane 有权
    煤层气生产系统及方法

    公开(公告)号:US09309749B2

    公开(公告)日:2016-04-12

    申请号:US13320192

    申请日:2010-05-13

    IPC分类号: B01J7/00 E21B43/00

    CPC分类号: E21B43/006 Y02E20/14

    摘要: Exemplary embodiments of the present technology provide systems and methods for producing power from coalbed methane (CBM) with decreased CO2 emissions. For example, a method of producing power according to an exemplary embodiment includes converting a feedstock from a hydrocarbon source into a gas mixture comprising CO2 and H2. The gas mixture is injected into a coalbed to cause CBM to desorb from the coal and CO2 to adsorb onto the coal. The hydrocarbon source is separate from the coalbed, i.e., does not exchange hydrocarbons with the hydrocarbon source. A gas mixture is produced from the coalbed, wherein the produced gas mixture includes H2 and CH4. The gas mixture may be combusted to generate power, while releasing lower amounts of CO2 than would be released from the combustion of pure CH4.

    摘要翻译: 本技术的示例性实施例提供了具有减少的CO 2排放的煤层气(CBM)生产电力的系统和方法。 例如,根据示例性实施例的生产电力的方法包括将来自烃源的原料转化为包含CO 2和H 2的气体混合物。 将气体混合物注入煤层,使煤层气从煤和二氧化碳中解吸吸附到煤上。 烃源与煤层分离,即不与烃源交换烃。 从煤层产生气体混合物,其中所产生的气体混合物包括H 2和CH 4。 气体混合物可以燃烧以产生动力,同时释放比从纯CH4的燃烧释放的更少量的CO 2。

    Systems and methods to inhibit packoff formation during drilling assembly removal from a wellbore
    7.
    发明授权
    Systems and methods to inhibit packoff formation during drilling assembly removal from a wellbore 有权
    在钻井组件从井筒移除期间抑制包装形成的系统和方法

    公开(公告)号:US09291019B2

    公开(公告)日:2016-03-22

    申请号:US13717164

    申请日:2012-12-17

    摘要: Systems and methods to inhibit packoff during drilling assembly removal from a wellbore, utilizing a drilling assembly that includes a transition region between a first section having a first cross-sectional area and a second section having a second cross-sectional area, wherein the second cross-sectional area is greater than the first cross-sectional area. The transition region includes a fluidizing assembly configured to partially fluidize a portion of the cuttings bed that is proximal to the transition region, and/or be in fluid communication with a flow control assembly configured to control flow rate of a fluidizing stream from the fluidizing assembly and to the portion of cuttings bed.

    摘要翻译: 利用包括在具有第一横截面积的第一部分和具有第二横截面积的第二部分之间的过渡区域的钻井组件来从井筒移除钻井组件期间抑制包装的系统和方法,其中第二十字 切片面积大于第一横截面积。 过渡区域包括流化组件,该流化组件被配置为部分地流过切割床的一部分,其接近于过渡区域,和/或与流动控制组件流体连通,该流动控制组件构造成控制流化流从流化组件 和切割床的部分。