8¼-in. MagTrak



8¼-in. MagTrak
Technical Data S ummary
8¼-in. MagTrak
The Baker Hughes MagTrak™ LWD Magnetic
Resonance service provides industry standard
T2 magnetic resonance logging data to accurately characterize the penetrated formations
and to estimate reserves while drilling. A
unique feature of MR data is to differentiate
bound fluids from moveable fluids. When the
moveable fluids are hydrocarbons (HC), the
producible reserves can be directly calculated.
The MagTrak system design is vibrationtolerant and allows for real-time LWD MR
measurements under the toughest drilling
conditions. This provides significant cost
savings as no non-productive time (NPT) is
encountered due to relogging operations.
Our service delivers the industry's finest
vertical resolution of any LWD MR tools. This
enables easy integration of the various LWD
measurements to better characterize the
reservoir. It is especially useful in complex
reservoirs, because the MR porosity
measurement is lithology-independent.
Industry-standard MR data while drilling
Vibration-tolerant design
High vertical resolution
MagTrak capabilities include real-time (RT) T2
distributions for decisions while drilling. It can
be used to identify fluid and rock property
changes, pick points for TesTrak™ formation
pressure testing, and helps placing the
wellbore in the sweet spot of the reservoir.
All raw data are stored and used for post-job
processing. Deliverables are a standard MR
log presentation including porosity, moveable
and bound fluid fractions, pore space
characterization, pore fluid saturations, and
permeability estimation.
Sufficient power is ensured by an integrated
alternator even in high-conductive muds.
For ease of operation, the MagTrak system
has pre-programmed acquisition modes that
cover a wide range of downhole formation and
fluid properties. No complex pre-job planning
is required.
No NPT by avoiding measurement after
Formation evaluation in real-time
Logging of highly inclined wells
High quality T2 measurements while drilling
Identify and quantify thin beds
Net-to-Gross in laminated intervals
Accurate lithology-independent porosity
Accurate reserve estimates also in complex
Short inter-echo time spacing
Accurate clay-bound and irreducible water
Zone of investigation within the formation
Data free of borehole effects
Customer-defined measurements
Tailored service for special applications
Measurement without radioactive sources
No hassle in handing and licensing sources
MagTrak LWD MR real-time deliverables:
Total and effective porosity
Moveable, irreducible, clay-bound fluids
Permeability index
Pore space characterization
Light HC indication
RT T2 distribution (optional)
Data quality indicator
Quality and productivity of the reservoir
Geosteering, geostopping, completion, etc.
Faster decisions on side tracking
Details about complex lithologies
High confidence in the measured data
8¼-in. MagTrak
©2014-2014 Baker Hughes Incorporated. All rights reserved.
MTK-70-01-003 Rev. A
Technical Data S ummary
8¼-in. MagTrak
Specifications and Limits for 12¼
General Tool Specifications
Borehole size (dependent upon borehole
conditions, requires near full stabilization)
US Units
12¼ in.
SI Units
311 mm
Sensor OD (C)
10⅝ in.
270 mm
Stabilization requirement
⅛ in. under gauge 3.2 m under gauge
It is recommended to run a flex sub below MagTrak to reduce bending moment on
MagTrak. However maximum DLS (Dogleg Severity) values are application-specific
and a function of various parameters such as BHA configurations, well profiles and
drilling modes (build, drop or hold). For optimum tool capabilities and limits, expert
company advice is required (BHASYS PRO).
Total length (A)
24.3 ft
7,407 mm
Total weight
4,630 lb
2,100 kg
Inner diameter
2.56 in.
65 mm
Effective flow area1)
Power Source
Drilling fluid-driven turbine
Connections top/bottom
BHI Mod. Box2) / BHI Mod. Pin2)
Available area for mud flow
To connect to Baker Hughes components only
Sensor Specifications
Sensor distance from bottom of tool (B)
Sensor aperture3)
(static vertical resolution)
@ ROP 50 ft/h
Diameter of investigation5)
Inter-echo time
Number of echoes
Resonance frequency
Effective magnetic gradient6)
US Units
SI Units
5.22 ft
1.593 m
4.6 in.
116 mm
5.8 in.
18 in.
147 mm
457 mm
±1 pu
Standard: 0.6 ms / 0.4 ms
Typically: 1,000
460 kHz nominal
-2.4 Gs/cm
Operating Specifications and Limits
US Units
SI Units
Flow Rate
Low flow
423–660 gpm
1.600–2,500 lpm
Normal flow
476–872 gpm
1,800–3,300 lpm
High flow
608–1,110 gpm
2,300–4,200 lpm
Maximum WOB
528 klb
2,400 kN
Maximum drilling torque
35 kft-lb
48 kNm
Maximum torque to failure
75 kft-lb
102 kNm
Overpull w/o rotation (continued operation)
1,125 klb
5,000 kN
Maximum overpull to failure w/o rotation
1,500 klb
6,700 kN
Operating Temperature Limits
Maximum hydrostatic pressure
25,000 / 30,000 psi 1,725 / 2,068 bar
Mud types
No hematite, no iron sponge
No restrictions for Rm = >0.1 ohm-m, for
applications with Rm <0.1 ohm-m please
Mud resistivity
consult your BHI representative for proper
pre-job planning.
Ditch magnets required
Cleaning every 12 circulation hours
Refer to Supplemental Technical
Maximum axial, lateral and torsional
Specification Document
Regarding rpm, sand content and LCM, please refer to the technical data sheets of the
applicable MWD platforms (e.g. OnTrak™, NaviTrak™)"
4 GB, equivalent to max.
1,800 hours logging time
95% signal pickup
@ high resistive mud, 25°C, medium oil, 4 echo train running average, ±1 pu accuracy. Vertical Resolution
depends on mud type, temperature, hydrocarbon type. Example: VR is 3.1 ft for 0.1 Ohm-m, 100°C, light oil
Diameter of sensitive volume, measured at center of gravity
With received MR signal amplitude weighted gradient
Drilling Services
2001 Rankin Road
Houston, Texas 77073
Phone: +1 713-625-4200
Although the information contained herein is believed to be accurate, no other representations are made concerning the information. Under no circumstances shall Baker Hughes be liable for any incorrect or incomplete
information. All technical specifications and commercial information concerning the product and/or services described herein may be changed at any time without further notice. Refer to Supplemental Technical Specifications
(TDS-20-60-0000-00) for further environmental specific specifications and information on the application, operation, and handling of Baker Hughes tools. Technical Data Summaries are controlled documents and can only be
released through the BHOS – Global Ops/AMO Documentation Group.