Method and system for super resolution least-squares reverse time migration

    公开(公告)号:US11733413B2

    公开(公告)日:2023-08-22

    申请号:US17245579

    申请日:2021-04-30

    发明人: Hongwei Liu Yi Luo

    摘要: A method may include obtaining seismic data regarding a geological region of interest. The method may further include obtaining a property model regarding the geological region of interest. The method may further include determining an adjoint migration operator based on the property model. The method may further include updating the property model using the seismic data and a conjugate gradient solver in a least-squares reverse time migration to produce a first updated property model. The conjugate gradient solver is based on the adjoint migration operator. The method may further include updating the first updated property model using a threshold shrinkage function to produce a second updated property model. The threshold shrinkage function comprises a sign function and a maximum function that are applied to the first updated property model. The method may further include generating a seismic image of the geological region of interest using the second updated property model.

    Micro invisible lost time in drilling operations

    公开(公告)号:US11697989B2

    公开(公告)日:2023-07-11

    申请号:US17004175

    申请日:2020-08-27

    摘要: A system is described for calculating and outputting micro invisible lost time (MILT). The system may include a processor and a non-transitory computer-readable medium comprising instructions that are executable by the processor to cause the processor to perform various operations. Time-stamp data that includes values of drilling parameters may be received about a drilling operation, and the values of drilling parameters may be classified into a rig state that includes rig activities. For each rig activity, an actual completion time may be determined and compared to an expected completion time for determining a deviation. At least one deviated activity, in which the deviation is greater than a threshold, may be determined. Deviations may be combined into MILT that can be output for controlling the drilling operation.

    APPARATUS AND METHODS FOR USING COLLOIDAL PARTICLES TO CHARACTERIZE FRACTURING TREATMENTS

    公开(公告)号:US20240209723A1

    公开(公告)日:2024-06-27

    申请号:US18392508

    申请日:2023-12-21

    申请人: PERM INC.

    IPC分类号: E21B43/267 E21B47/003

    CPC分类号: E21B43/267 E21B47/003

    摘要: Apparatus and methods for determining the size of an underground fracture network. The method includes injecting a colloid into the formation, the colloid including a carrier liquid and sized particles with a particular size distribution. After extracting fluid from the formation, a quantity of the extracted sized particles is determined. Based on the size distribution of the injected sized particles and the measured quantity of extracted sized particles, the size of the fracture network is determined. Using sized particles means that the fractured network can be selectively determined as the particles are too large to enter the rock matrix itself.