Paper -RT Monitoring and Control of the Drilling Process

7/29/2019 Paper -RT Monitoring and Control of the Drilling Process

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Real-time monitoring and control of the

drilling processWITSML SIG, Paris May 2007



Well construction operation challenges• 15% to 30% of drilling operations is spent in non productive time

• Small problems can escalate in very costly situations (formation fracturing

mud losses cannot run casing technical sidetrack)

Support organization:• detect and diagnose potential problems

as early as possible

Drilltronics DrillScene

At the well site:• avoid generating problems by enforcing

drilling operations within safe guards



• Objective:

–reduce non-productive time during drilling operations by

avoiding influx from formation, formation fracturing and

collapse, poor hole cleaning, drill-string damage• Principle:

–it is a drilling control system based on Cyberbase from

National Oilwell Varco (NOV) which controls actively the

draw-work, top-drive and mud pumps to account for the

dynamic behavior of the well during drilling operations

•

Usage: –Used by the driller and assistant driller at the rig site

• Project:

–Started in 2003 and sponsored by Statoil and ENI and

realized by IRIS and NOV

• Status:

–All functionalities have been successfully tested on a testrig (Ullrigg) in May 2006

–Will be tested on Statfjord C (North Sea) Sept 2007

Drilltronics Summary



Drilltronics Functionalities



Drilltronics drillstring velocity limitsObjective:

– Limit acceleration/deceleration and velocity

during tripping operations to avoid damaging

open hole section due to swab/surge effects.Principle:

– Define a top and bottom limits for hook

movement (typically from 1m to 30m)

– Use at any time the minimum of the machine

limits and the well limits for the

acceleration/deceleration and velocity

– The well limits are calculated in real-time by

Drilltronics and varies with the mud condition

and the bit depth.

Function:

– Activated via key pad (Trip limits on)

– Normal use of joystick (but

acceleration/deceleration and velocity

controlled by maximum limits)



• Objective:

– Progressive startup of mud pump accounting for

gel, temperature and fracturing pressure inopen hole.

• Principle:

– If air in drill-pipe, use fill pipe function until a

maximum SPP is reached.

– Increase pump rate in a stepwise way with

guaranteed minimum waiting time between

each plateau. Two startup modes:

• Stepwise: used to start pump by increments

when final flowrate is not yet decided

• Resume: used to start pump to a pre-

defined flow rate• Function:

– Key pad activated (additional options to

standard pump control functions)

Drilltronics Pump startup



Drilltronics core system

Drilltronics Architecture (next version)

Dedicated

WITSML

server

Machine Control

System

DrillingPerformance

Calculation3.rd party

GUI

Client

3.rd partyData

•WITSML

•OPC

•SOAP, WSDL

3.rd party

Models

Web

Service

Tripping limits

Calculation

Pump Startup

Calculations



• Objective:

– Continuous assessment of drilling performance and risks.

–

Early warning in real-time to support drilling operations.• Principle:

– Use a WITSML server as the source of real-time data

– Continuous modeling of the mechanical and hydraulic

situation in the complete wellbore and drill-string

– Continuous calibration of mechanical and hydraulic

models to match measurements– Alarm generation when hole conditions closed to or

exceeding limits

• Usage:

– Used by drilling engineers, operation geologists

•Project:

– Started in 2005 and funded by Norsk Hydro and ENI

• Status:

– Tested at Norsk Hydro on Grane (North Sea), January -

February 2007

DrillScene Summary



DrillScene Architecture

Rig data

Database

WITSML client

Web service

Well response

modeling andcalibration (1s)

Forecast

estimation(15 to 30 min)

Drilling

operation margincalculations

(2min)

Server Clients



• Complete and continuous description of hydraulic

regime in wellbore and drillstring

• Calibration of hydraulic model based on pumppressure and downhole ECD

• Monitoring of open hole ECD with regards to geo-

pressure margins

• Monitoring of tank volume to detect gain or loss

• Continuous calculation of thermal exchange andeffects on wellbore stability

• Monitoring of torque/drag limits along drillstring at

any time

• Account for hydraulic effects on mechanical results

• Calibration of mechanical model when bit is off

bottom

• Monitoring of mechanical friction evolution has an

indicator of poor hole cleaning

DrillScene Functionalities

Downhole ECD

Measurement

Downhole ECD

Modeled In annulus



DrillScene test at Norsk Hydro: Grane

Grane’s

WITSML Server

Inteq

Head Quarter’s

WITSML Server

KongsbergIntellifield

Head Quarter’s

DrillScene

Server for Grane

DrillScene on Grane’s engineers

desktops (7 users)



Summary

Use WITSML as a transfer protocol

Transform data into dynamic safe guards

to control drilling machineries at the rig site

Drilltronics

Transform data into dynamic alarms to

support decision making for the support

organizationDrillScene

Documents

Paper -RT Monitoring and Control of the Drilling Process