Method for determining in-situ maximum horizontal stress

    公开(公告)号:US11960046B2

    公开(公告)日:2024-04-16

    申请号:US17155803

    申请日:2021-01-22

    Inventor: Yanhui Han

    Abstract: A method for obtaining a maximum horizontal stress at a depth of a geological formation, includes: setting an estimate SHmax of the maximum horizontal stress; conducting an elastoplastic modeling simulation of the geological formation around a wellbore with the estimate SHmax and obtaining a simulated value ϕb,1 of a breakout angle, wherein the breakout angle is a half-width of a breakout region; and upon determining that the estimate ϕb,1 is greater than or equal to a prescribed value and is different from a measured breakout angle ϕb,m at the depth by more than a threshold value, repeatedly changing the estimate SHmax and conducting the elastoplastic modeling simulation.

    METHOD FOR THE DETERMINATION OF MUD WEIGHT WINDOW IN N-POROSITY N-PERMEABILITY FORMATIONS

    公开(公告)号:US20230228181A1

    公开(公告)日:2023-07-20

    申请号:US17648034

    申请日:2022-01-14

    CPC classification number: E21B44/00 E21B49/00 E21B21/00 E21B7/04

    Abstract: A method includes obtaining total stresses and pore pressures of each porous medium of a formation, determining a first and second set of effective stresses for the formation, determining an individual collapse and fracturing mud weight for each porous medium of the formation using a first set of associated failure criteria, wherein the first set of associated failure criteria are based on the first set of effective stresses, determining an overall collapse and fracturing mud weight for the formation using a second set of associated failure criteria, wherein the second set of associated failure criteria is based on the second set of effective stresses, determining a mud weight window for the formation using the individual collapse mud weight, the individual fracturing mud weight, the overall collapse mud weight, and the overall fracturing mud weight, and transmitting a command to a drilling system based on the mud weight window.

    METHOD FOR MANAGING SANDING VOLUME EXPECTATION IN WEAK SANDSTONE BASED ON PLASTIC ZONE VOLUME

    公开(公告)号:US20250110031A1

    公开(公告)日:2025-04-03

    申请号:US18478668

    申请日:2023-09-29

    Abstract: Described is a method for managing an expectation on sanding volume in weak sandstone. In situ data related to a region of sandstone proximate a well is acquired. Measured property data corresponding to samples from the region of sandstone are obtained, and a chemical consolidation treatment is performed on the samples. Chemical consolidation treatment data is then obtained. The measured property data and the chemical consolidation treatment data is supplied as inputs to a simulator. The simulator performs simulations with and without chemical consolidation treatment. Based on the simulations, a correlation between a well flow rate and an effect of the chemical consolidation treatment is determined.

    INTEGRATIVE WORKFLOW OF CONSTRUCTING MECHANICAL EARTH MODEL (MEM) FOR WELLBORE DRILLING

    公开(公告)号:US20240402384A1

    公开(公告)日:2024-12-05

    申请号:US18326986

    申请日:2023-05-31

    Abstract: A method of constructing a mechanical earth model (MEM) includes integrating a density logging data set to compute vertical stress and applying correlation models or equations to estimate a pore pressure and mechanical properties. The method also includes calibrating the pore pressure with drill stem test data, calibrating the mechanical properties with laboratory tests on core plugs or on rock cuttings, estimating a minimum horizontal stress using correlation models, and calibrating the minimum horizontal stress with minifrac tests. The method further includes estimating a maximum horizontal stress using the correlation models while assuming one or more correlation parameters, calibrating the maximum horizontal stress with a global pattern of tectonic strains and a basin stress regime, evaluating one or more breakout regions using the MEM, a trajectory of a well, and a geometry of a pilot hole, and comparing the one or more breakout regions and a caliper logging data set.

    METHOD FOR DETERMINING IN-SITU MAXIMUM HORIZONTAL STRESS

    公开(公告)号:US20220236446A1

    公开(公告)日:2022-07-28

    申请号:US17155803

    申请日:2021-01-22

    Inventor: Yanhui Han

    Abstract: A method for obtaining a maximum horizontal stress at a depth of a geological formation, includes: setting an estimate SHmax of the maximum horizontal stress; conducting an elastoplastic modeling simulation of the geological formation around a wellbore with the estimate SHmax and obtaining a simulated value ϕb,1 of a breakout angle, wherein the breakout angle is a half-width of a breakout region; and upon determining that the estimate ϕb,1 is greater than or equal to a prescribed value and is different from a measured breakout angle ϕb,m at the depth by more than a threshold value, repeatedly changing the estimate SHmax and conducting the elastoplastic modeling simulation.

    Methods for designing coated proppant in low viscosity carrier fluid

    公开(公告)号:US11370962B1

    公开(公告)日:2022-06-28

    申请号:US17170125

    申请日:2021-02-08

    Abstract: A process for designing a coated proppant particle for downhole transportation and placement. A carrier fluid may transport the coated proppant particle downhole. The process may include selecting a proppant particle material and a coating material. The process may also include selecting a target reduction in a settling velocity and determining a diameter of the coating material disposed on the proppant particle material based on the selected proppant particle material and the density of the coating material. The process for designing a coated proppant particle may include selecting a coating material thickness for coating on the proppant particle material and determining a coating material and design for coating on the proppant particle with the coating material thickness based on the selected proppant particle material and thickness of the coating material to achieve the target reduction in settling velocity.

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