CRITICAL DOWNHOLE TORQUE OF A DRILLING SYSTEM AND BIT DESIGN TO MITIGATE HFTO

    公开(公告)号:US20250034983A1

    公开(公告)日:2025-01-30

    申请号:US18360554

    申请日:2023-07-27

    Abstract: Disclosed herein are embodiments of a method and system for determining a critical torque on bit to reduce the occurrence of high frequency torsional oscillation (HFTO). In one embodiment, a method includes detecting at least one drilling parameter of an offset drill bit for a type of drilling system during an offset drilling operation using at least one in-bit sensor; determining a critical torque on bit (TOB) that is to excite HFTO of the offset drill bit based on the at least one drilling parameter and based on the type of drilling system; measuring, for a current drilling operation, a current TOB and a current weight on bit (WOB) of a current drill bit having a same type of drilling system as the type of drilling system for the offset drilling operation; determining whether current TOB exceeds critical TOB; and mitigating the HFTO for the current drill bit.

    Shaped cutter with multiple radial ridge sets

    公开(公告)号:US12065886B2

    公开(公告)日:2024-08-20

    申请号:US17956671

    申请日:2022-09-29

    Inventor: Shilin Chen

    CPC classification number: E21B10/5673 E21B10/5735

    Abstract: Various shaped cutters are disclosed for use on a drill bit or other wellbore forming tool. In one aspect, the shaped cutter includes a plurality of radial ridge sets. Each radial ridge set includes a plurality of ridges radially extending along the cutting table between a periphery of the cutting table and the cutter axis. The cutter may be positioned on the drill bit with one of the radial ridge sets exposed to the formation so the ridges may generate multiple cracks in the formation while drilling. After the current radial ridge set becomes worn, the cutter may be repositioned on the drill bit to expose another one of the radial ridge sets, such as during a repair, refurbish, or maintenance operation. The plurality of ridges may also exploit vibrations in the drill string to enhance rock failure.

    Shaped Cutter With Peripheral Cutting Teeth And Tapered Open Region

    公开(公告)号:US20240110447A1

    公开(公告)日:2024-04-04

    申请号:US17956659

    申请日:2022-09-29

    Inventor: Shilin Chen

    CPC classification number: E21B10/5673

    Abstract: A shaped cutter has a plurality of peripheral cutting teeth to enhance drilling. The shaped cutter may enhance rock failure modes in addition to shearing, such as by indentation, impacting, scraping and grinding. The peripheral cutting teeth are located along the periphery, where cutting energy and forces may be highest. An open region radially inward of the peripheral cutting teeth may be axially recessed to increase the proportion of cutting load on the peripheral cutting teeth. The cutting table may be tapered to modify a back rake angle. The flared periphery may result in a sharper indentation angle and/or larger radius of contact. The plurality of cutting teeth may also exploit vibrations in the drill string to enhance rock failure.

    Shaped Cutter With Ridges And Multi-Tapered Cutting Face

    公开(公告)号:US20240110446A1

    公开(公告)日:2024-04-04

    申请号:US17956647

    申请日:2022-09-29

    Inventor: Shilin Chen

    CPC classification number: E21B10/5673 E21B10/43 E21B10/55

    Abstract: A shaped cutter has a plurality of ridges extending in parallel across a cutting face to enhance drilling. The cutting table is also multi-tapered, being convex along a first cross-section perpendicular to the ridges and concave along a second cross-section parallel with the ridges. The shaped cutter may enhance rock failure modes in addition to shearing, such as by indentation, impacting, scraping and grinding. The plurality of ridges may also exploit vibrations in the drill string to enhance rock failure. The cutting table may be positioned on a drill bit to define an internal back rake angle with respect to a slope angle where the cutting table is concave. The cutting table may include a flared periphery, resulting in a sharper indentation angle and/or larger radius of contact with the formation.

    Monitoring Drilling Conditions And Estimating Rock Properties

    公开(公告)号:US20240035375A1

    公开(公告)日:2024-02-01

    申请号:US17875107

    申请日:2022-07-27

    CPC classification number: E21B49/003 E21B47/04 E21B21/08 E21B47/013

    Abstract: A method and a system for a confined compressive strength (CCS) and an unconfined compressive strength (UCS) for one or more bedding layers. The method may include identifying a depth interval during a drilling operation as a distance between a first depth and a second depth, measuring one or more drill bit responses within the depth interval using a sensor package disposed on the drill bit, identifying one or more torsional bit vibrations, and identifying one or more bedding layers of the formation within the depth interval from the one or more torsional bit vibrations. The method may further include identifying the (CCS) and the (UCS) for each of the one or more bedding layers and identifying a bit wear of the drill bit within each of the one or more bedding layers using the one or more drill bit responses and the one or more torsional bit vibrations.

    MULTIPLE INTERMEDIATE STEP SIMULATION OF DRILL BIT DAMAGE

    公开(公告)号:US20230385474A1

    公开(公告)日:2023-11-30

    申请号:US17826701

    申请日:2022-05-27

    CPC classification number: G06F30/17 E21B10/42

    Abstract: A method comprises determining an initial element wear profile of at least one element of a drill bit prior to the drill bit being used for drilling a wellbore and determining a wear depth for each of the at least one element of the drill bit after the drill bit has drilled at least a portion of the wellbore. The method includes determining a final element wear profile of the at least one element of the drill bit based on the wear depth of at least one element of the drill bit. The method includes performing the following for each of one or more intermediate steps between the initial element wear profile and the final element wear profile, determining an intermediate element wear profile of the at least one element; and determining at least one wear parameter for the at least one element based on the intermediate element wear profile.

    Drill bit design selection and use

    公开(公告)号:US11704453B2

    公开(公告)日:2023-07-18

    申请号:US16433937

    申请日:2019-06-06

    Inventor: Shilin Chen

    CPC classification number: G06F30/17 E21B10/00 E21B10/54 E21B47/007 E21B2200/20

    Abstract: Systems and methods are disclosed for selecting a drill bit design that reduces or eliminates bit induced stick-slip. In some embodiments, each of a set of test drill bits is correlated with stick-slip events, wherein each of the test drill bits has a different design pattern comprising a combination of structural attributes. The design pattern stick-slip correlation includes, for each of the test drill bits, detecting variations in motion of the test drill bit during drilling operation. Stick-slip for each of the test drill bits is detected based on the detected variations in motion of the test drill bits during operation. The correlation further includes in response to detecting stick-slip, recording a stick-slip event in association with the corresponding test drill bit. The method further includes determining a performance efficiency value for each of the plurality of test drill bits and correlating the determined performance efficiency values with the stick-slip events to determine a threshold performance efficiency value. A design pattern for a drill bit is selecting or determined based, at least in part, on the threshold performance efficiency value.

    FIBER OPTIC TELEMETRY SYSTEM
    9.
    发明申请

    公开(公告)号:US20210372276A1

    公开(公告)日:2021-12-02

    申请号:US17226545

    申请日:2021-04-09

    Abstract: This disclosure presents systems to enable downhole bi-directional communications using a long length of fiber optic cable located within or partially within the internal diameter of a set of lower pipe segments and communicatively coupled to one or more upper pipe segments that utilize pipe cable attached to the outside diameter of each of the upper pipe segments. The long length of fiber optic cable and the one or more pipe cables from the upper pipe segments allow for communication coupling between downhole tools and surface equipment and surface computing systems. In some aspects, the pipe cable attached to the upper pipe segments can be protected from wear using clamps, collars, cages, and other protectors. In some aspects, an optical signal generator and modulator, e.g., a light source, can be located downhole proximate the downhole tools, uphole proximate one of the upper pipe segments, or proximate the surface equipment.

    PDC bits with mixed cutter blades
    10.
    发明授权

    公开(公告)号:US10650108B2

    公开(公告)日:2020-05-12

    申请号:US16185138

    申请日:2018-11-09

    Inventor: Shilin Chen

    Abstract: Downhole drilling tools designed and manufactured to minimize or reduce imbalance forces and wear by disposing cutting elements in cutter groups and cutter sets in a level of force balance and by placing impact and/or wear resistant cutters on blades subject to high impact forces and/or large loadings. Manufacturing costs may be reduced by placing inexpensive cutters on blades not subject to high impact forces and/or loadings. Some embodiments comprise designing downhole tools with combinations of thicker blades to receive high impact forces and/or loadings with thinner blades. Some embodiments comprise designing downhole drilling tools with optimized fluid-flow properties. Designing methods may comprise performing simulations on a designed tool, evaluating respective forces acting on cutters during simulated engagement with a downhole (uniform and transitional) and/or evaluating wear on cutters and bit, and/or CFD simulations to evaluate fluid-flow optimization on a tool. Various cutter layout procedures and algorithms are described.

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