Mwd
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Transcript of Mwd
![Page 1: Mwd](https://reader036.fdocuments.in/reader036/viewer/2022081716/552b12014a79593a588b4594/html5/thumbnails/1.jpg)
Measurement While DrillingMeasurement While DrillingAn OverviewAn Overview
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Surveys are taken:– To permit calculation of well coordinates at a
series of measured depths, thus specifying well path and current bottom hole location
– To measure inclination and azimuth, hence well direction
– To determine orientation of tool face– To locate doglegs and allow calculation of dogleg
severity
Overview of SurveyingWhy Well bores are Surveyed
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Accurate knowledge of the course of a well bore is necessary:– To avoid collision with other wells– To allow intersection by a relief well in the event
of a blowout– To hit the geological target areas– To provide a better definition of geological and
reservoir data to allow for optimization of production
Overview of SurveyingWhy Well bores are Surveyed
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Overview of SurveyingData Gathering Techniques
Photographic film– Disks / strip
Memory modules– Multi-shot / MWD
Wire line– Surface readout
Mud Pulse Telemetry– MWD
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Overview of SurveyingTechnology Tree
Survey
Magnetic
Low INC
SSMS
High INC
MSMWD
Gyroscopic
Low INC
Non SRG SRG
High INC
North Seeking
Inertial
SS = Single-Shot MS = Multi-ShotOR = Orientation ST = Steering Tool SRG = Surface Readout GyroMWD = Measurement While Drilling
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Probe systems– Battery powered– 150°C (302°F)
Collar systems– Turbine powered– 125°C (257°F)– Large hole
Overview of SurveyingMWD
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Overview of SurveyingCollar MWD
Function– Provide extremely reliable
borehole surveying and drillstring orientation, non-magnetic environments.
– Act as the platform for all gamma, dynamic, resistivity, and nuclear measurements
Limitations– Hot hole environments
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MWD
Short Radius Motor
• Efficiency– Eliminate wireline– Compliment Drilling Systems
• Safety– No split bushings– BOP Operation– Continuous circulation
• Cost– Cost savings– Assist the overall drilling project
economics
GammaInterchangeable Sensor Modules
Directional
Overview of SurveyingMWD (Short Radius)