This document provides an overview of Hamza Nasir's internship presentation on drilling services at NUST CEME. The objectives of the internship were to get familiarized with oilfield services, drilling operations, and related tools and equipment. Key topics covered include directional drilling techniques using measurement-while-drilling (MWD) tools to monitor borehole inclination and azimuth in real-time. The presentation discusses Weatherford's electromagnetic MWD and extended range MWD systems, including their specifications, components, benefits, and applications.

1. Internship Presentation
Drilling Services
Hamza Nasir
NUST CEME

2. Objectives
• To get familiarize with Oilfield Services.
• Learn Drilling Services Operations.
• Familiarization with tools and equipment related to drilling.
• Perform daily assignments on the yard.
• Study EMS MWD Surveying and Extended Range MWD tools and
technique.

3. Directional Drilling
• Directional drilling is
used for controlling the
direction and deviation
of wellbore to a
predetermined
underground location.

4. Applications of Directional Drilling
• Multiple wells from a single location.
• Inaccessible surface locations.
• Multiple target zones.
• Salt-dome explorations.

5. MeasurementWhile Drilling (MWD)
• Drilling has become complex with horizontal and directional drills so well
logging has also had to adapt and improve.
• MWD is a type of well logging that incorporates measurement tools into the
drill string and provides real time information to help with steering the drill.
• MWD uses gyroscopes, magnetometers and accelerometers to determine
borehole inclination and azimuth during the actual drilling.

6. MeasurementWhile Drilling (MWD)
• MWD tool consists of
• Sensor Package
• Electronic Package
• Transmission System.
• Electromagnetic MWD system uses drill string as antenna to transmit signals to the
surface.
• The whole assembly is inside the NMDC (Non-Magnetic Drill Collar) to avoid
interference with the directional sensor.

7. Electromagnetic Multishot System
• The EMS (Electromagnetic Multishot System) is an electromagnetic
borehole surveying system.
• Weatherford’s EMS system is capable of performing single shot and
Multishot orienting surveys.

8. EMS Specification
• Weatherfords’s EMS system has following mechanical specifications:
• Temperature rating without heat shield: 120 degree centigrade
• Temperature rating with heat shield: 210 degree centigrade for 4 hrs.
• Battery source: AAA Alkaline batteries
• Pressure case OD (in): 1-3/8
• Flow rate (Gpm): 300
• Maximum RPM: 60

9. EMS Specification
• Weatherford’s EMS has following measurement specification
• Azimuth accuracy: ± 0.5°
• Inclination accuracy: ± 0.1°

10. Bottom Hole Assembly
• Length below drilling collar:
• 9 feet= 33%
• 10-19 feet= 40%
• 20 feet= 50%
HWPP
DC
NMDC
Tatco Pipe
Bit Sub
Bit

11. Requirements for EMS job
• NMDC according to designed BHA. (must be ordered by the client company)
• Tatco Ring according to the BHA size.( provided by the client company or
drilling contractor)

12. Weatherford’s MWD Services
Benefits
The reasons to chooseWeatherford’ MWD Services
• MORE Economy
• MORE Efficiency
• MORE Capability

13. EM Pulse MWD System
• Weatherford’s EMpulse electromagnetic (EM) measurement-while-drilling
(MWD) system allows operators to drill and survey wells independently from
rig hydraulics.
• With EM telemetry, rig pumps do not need to be cycled to receive a survey.
Therefore, overall survey cycle time can be reduced and can add up to a
significant rig time saving, especially on high rate-of-penetration (ROP)
wells. Once the connection is made, drilling resumes immediately as tools
are readily available.

14. EM Pulse System
The EM Pulse System is made of these individual tools and sensors
• BTR (Bottom holeTransmitter) tool
• CDS (Clever Deviation Sonde)
sensor contains accelerometers and magnetometers for directional surveys
• GRG4 (Gamma RayGeneration 4)
sensor Contains scintillator crystal for detecting gamma radiation
• CSGx (Clever Strain Gauge X)
Contains pressure transducer to measure annular pressure
• Tin (Temperature Internal) sensor

15. EM Pulse System
The EM pulse system employs
• LEC & Emitting Sub
Assembly for EM data transmission
• G4 Battery
Lithium battery assembly for power
• Spectrum™ surface acquisition software for data acquisition and processing

16. EM Pulse System Configuration
• LEC is on the top of the tool.
– Bipod /Tripod for non-CSGx setup
• Tin is a component inside the CDS
• G4 Batteries are available in standard and high
temperature versions.
• Co-axial centering sleeves with centralizers are fitted
between the sensors/tools.
• Stinger with annular port employed only with CSGx on bottom of tool.

17. Extended Range EM System
•Extended Range EM setup utilizes Cable thru drillpipe to
targeted depth .The application of this technology will
depend upon the resistivity of formations.

18. Deployment of ExR Antenna
• EM-MWD installed in BHA at surface
• At desired depth, ran E.R. antenna inside drillstring
• Latch onto MWD tool
• Cut cable and hung off inside drill pipe
• EM communication established
• Continue tripping in or start drilling

19. Drilling with ExR Antenna
• Standard drill pipe connections
• No cable trip during pipe connection, no side entry sub
• Once E.R. antenna installed, EM MWD operates as with standard set-up
• EM transmission with ER always work inside casing

20. Questions???