improving drilling reliability with time- based & real ... · powerpoint presentation author:...

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Improving Drilling Reliability with Time-

Based & Real-Time Models

Raju Gandikota

MindMesh Inc.

18-Feb-19 MindMesh Confidential © 2018 218-Feb-19 MindMesh Confidential © 2018 2

• Reducing tool failure and improving reliability is becoming critical among theindustry, especially when pushing drilling limits.

• Standard BHA modeling software though fast have limitations to include realisticdownhole behavior.

• Advanced Drilling Dynamic Models or Time Domain Models can help model & predictbetter downhole responses.

• We have a developed RiMo software platform to improve drilling reliability fromengineering office to the edge.

Introduction


• The industry standard drilling dynamics models that are wellpublished and commercially used in the industry use thefollowing methods:

• Linear & Non-Linear static analysis to predict BHA contact withborehole.

• Linear Dynamics or Critical Speed Analysis to predict resonancefrequencies as a function of WOB, flow rate & RPM.

• These models are fast and are good for initial BHA evaluation.

Slide 2Standard BHA Models


• Typical results from standard BHA analysis.

• BHA cross-sections, contact forces etc. show BHA sag potential issues as a function of WOB.

• Provides insight on BHA bending, weight transfer, stabilization and potential directionality.

Static BHA Analysis Results

Standard BHA Models


• Dynamic or Vibration analysis provides an understanding of a BHA’s response due to axial, lateral and torsional responses during drilling.

• Typically the natural frequency and critical speed maps of the BHA under a combination of WOB vs. RPM are reviewed as a function of hole size, stabilization etc.

Critical Speed Map of the BHA Lateral vibrations of the BHA

Standard BHA Models


• No explicit concept of borehole or borehole interactions.

• The constraints on the BHA components are either fixed or free.

• Time varying contact with wellbore cannot be modeled.

• No direct outputs for shock & vibrations.• Drilling dysfunctions like stick-slip, whirl, bit

bounce are not explicitly modeled.• Borehole or washouts are not handled in

critical speeds analysis.• Guidelines are usually provided to use

critical speed maps for drilling dysfunctions.

Limitations of Standard BHA Models


• Time Domain Analysis (TDA) models more detailed BHA response in the wellbore.• Capture realistic downhole behavior.• Can handle detailed boundary conditions, excitations mechanisms and borehole

contact.• Usual methods are time consuming to input data, run program, and interpret

outputs.• Traditionally FEM has been used to solve TDA.

Time Domain Models


• The Time Domain Analysis (TDA) is based on the following governing dynamic equation:

• An isolated beam element is used to describe the BHA & DS.• A mixed multi-body and finite element method is used to solve,

providing scale & speed within the RiMo platform.• This solution technique makes the method efficient and robust

compared to other published techniques.• Full BHA & wellbore interactions are modeled with frictional

contact. • Drill bit and formation properties are modeled.

Mb q + k = fg +fa +fc − Cbq − Db q

Time Domain Models


• The TDA model runs analysis in near real time.

• Model scalable to run from bit to top drive.

• Take in real-time data from WITS feed and run analysis continuously.

• Multi-threaded with parallel computing capabilities to run multi-analysis with same data feed.

• Open physics model to handle most BHA’s and special tools like shock sub, agitators etc.

Features of the Time Domain Model in RiMo


• The TDA very detailed results and virtual sensor along BHA & Drillstring.• A dashboard type results viewing is used to interpret the BHA behavior over time.

Time Domain Analysis

RiMo Time Domain Models – On Bottom Drilling


• A closer look at shock & vib

RiMo Time Domain Models – On Bottom Drilling

Lateral vibrations

Axial vibrations

Torsional vibrations


Reliability Analysis with TDA


Reliability Analysis with TDA

Static

Time domain

• At time domain analysis, contact behavior is more complex

• At time domain analysis, contact force is larger

• Large contact force at mud motor and MWD may cause failure

• The time domain analysis result is at t=40s

motor MWD


Long Laterals = Challenges in Hole Cleaning

• Standard hydraulics is limiting for hole cleaning and cuttings transportation.• Long laterals & slim hole conditions creates additional challenges.• Advanced Time based Hydraulics and Digital Twin models provide deep insights.


Conclusion

• Long laterals & slim hole conditions mean tool reliability challenges.

• Standard BHA models are good starting point but insufficient.

• Advanced Time Domain Models captures realistic downhole behavior and insights.

• Fast running TDA means better decision making to improve operational efficiency and improve tool reliability.


RiMo - Advanced Well Engineering Software Platform

RiMo offers:

Insights as a serviceLeverage Advanced Models, AI and ML driven analytics models to derive intelligent business insights.

Platform as a serviceImplement the cutting edge digital engineering platform to fuel data driven transformation.

DrillStringDesign

DrillStringDynamics

Digitally Enabling Your

Enterprise

Static Analysis

Directional Tendencies

Critical Speed Analysis

Time Domain Analysis

Soft String & T&D

Stiff String & T&D

Hydraulics

Wellbore Stability

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Thank Youwww.mindmeshtech.com

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