Sperry Sun - LWD and LWD Services
Sperry Sun - LWD and LWD Services
Sperry Sun - LWD and LWD Services
MWD/LWD
Services
Telemetry Systems
Four MWD telemetry systems are available from Sperry
Drilling: positive mud pulse, negative mud pulse,
electromagnetic and via wired drillpipe. The mud pulse
systems use valves to modulate the flow of drilling fluid in
the bore of the drillstring, generating pressure pulses that
propagate up the column of fluid inside the drillstring and
then are detected by pressure transducers at the surface.
The positive pulse system momentarily restricts mud
flow through the downhole tool, resulting in a pressure
increase, or positive pressure pulse, that propagates to
the surface. With the negative pulse system, mud is
momentarily vented from the bore of the drill collar
directly to the annulus, bypassing the bit jets and creating
a brief pressure drop, or negative pressure pulse, inside
the drillstring, which propagates to the surface. In both
mud pulse systems, data from downhole sensors are
encoded and transmitted by varying the time between
consecutive pressure pulses.
The electromagnetic telemetry (EMT) MWD system
transmits data via low-frequency electromagnetic waves
that propagate through the earth and are detected by a
grounded antenna at the surface. It provides higher data
rates and greater reliability than traditional mud pulse
systems. Electromagnetic telemetry is particularly
applicable for drilling with air, foam or aerated muds that
preclude the use of mud pulse. It is also widely used in
geothermal drilling, as well as in areas with high mud
losses. Previously constrained to shallow land
applications, this electromagnetic telemetry service has
recently been enhanced by Sperry and successfully
deployed offshore and in deep shale wells.
MWD Sensors
Fundamental to our MWD services are sensors that
provide directional survey and drilling information to
facilitate accurate wellbore placement along with safe
and efficient drilling.
Directional surveying sensors consist of tri-axial
accelerometers and magnetometers that determine the
orientation of the drillstring with respect to the earths
LWD Sensors
LWD sensors provide petrophysical information similar
to that obtained from openhole wireline tools but with
the added benefits of delivering the data in real time
while drilling and typically acquiring the data before
significant invasion or washout has occured. LWD tools
are particularly well suited to logging high-angle and
horizontal wells, where real-time geosteering
applications are often important and where wireline
logging can be difficult, time-consuming and costly.
LWD logging is also particularly applicable on high-cost
drilling projects where the savings in rig time while
replacing wireline are substantial.
3-1/8-in.
79 mm
3-3/8-in.
86 mm
3--in.
89 mm
4--in.
121 mm
6--in.
165 mm
6--in.
171 mm
7--in.
184 mm
7--in.
197 mm
8-in.
203 mm
9--in.
221 mm
Sensors
Directional (PM, DM, PCD)
At-bit inclination (ABI)
Drillstring vibration (DDS)
Gamma/at-bit inclination
(GABI)
Resistivity (M5)
Azimuthal deep resistivity
(InSite ADR)
Azimuthal focused resistivity
(InSite AFR)
Formation density (SLD)
Azimuthal density (ALD)
Neutron porosity (CTN)
Caliper (AcoustiCaliper)
Sonic (BAT)
Sonic (QBAT)
NMR (MRIL-WD)
Telemetry Systems
Positive pulse (DWD)
IntelliServ Network
Sales of Halliburton products and services will be in accord solely with the terms and conditions contained in
the contract between Halliburton and the customer that is applicable to the sale.
H07333 7/10 2010 Halliburton. All Rights Reserved.