Easily go where mud pulse telemetry cannot
Electromagnetic Telemetry MWD System
The APS SureShot™ EM telemetry MWD system communicates by transmitting electromagnetic waves through the formation instead of pressure pulses through a fluid column. Benefits include time saved by transmitting surveys during a connection, high data rates and the ability to operate in conditions where mud pulse telemetry cannot.
SureShot EM is compatible with all APS downhole sensors. The electromagnetic transmitter uses the same flow subs and is a drop-in alternative for the mud pulse transmitter, having many parts in common with the SureShot mud pulse MWD system. Operators benefit from reduced inventory cost and increased flexibility when providing a mix of EM and mud pulse MWD services.
SureShot EM is a state-of-the art system with a downhole tool featuring two-way electromagnetic communication. The sequence and frequency of transmitted measurements is EM downlink selectable. Whether it's a higher density log to pick a casing point, more pressure measurements for drilling optimization or emphasis on directional measurements while sliding, SureShot EM enables the operator to quickly choose the optimum data sequence for the drilling operation.
SureShot EM works with all APS downhole sensors. The EM transmitter uses the same flow subs and is a drop-in alternative for the mud pulse transmitter, having many parts in common with the SureShot mud pulse system. Operators benefit from reduced inventory cost and increased flexibility when providing a mix of EM and mud pulse MWD services.
LWD and pressure measurements for any drilling situation.
Features & Benefits
- Data rates up to 12 bps.
- High-power 50 W transmitter for two-way EM communication.
- Downhole selectable data sequences – choose the optimum combination of directional, LWD and pressure measurements for the drilling operation.
- EM Downlinking – Quickly adjust power, bit rate, carrier frequency and telemetry sequences for the conditions.
- Plug-and-play compatibility with APS SureShot downhole and surface equipment.
- Operates with batteries or turbine alternator for extended bit runs and high current draw applications.
- Unique rugged, reliable dual gap sub.
- WPR™ resistivity compatible.
- Fixed-mount and retrievable configurations are available.
- Depth tracking options include the SureShot Depth Tracker, the SureShot mud pulse SIU and WITS.
Design
- Quad-channel digital surface receiver to rapidly select the best signal from among 4 antenna pairs as the well progresses.
- Gap sub is a dual-gap design for added reliability.
- Ceramic sleeves prevent loss of power due to arcing.
- No coating to wear and arc.
- Dual insulator rings for greater reliability.
- Higher power to the formation due to gap distance.
Applications
- High ROP drilling with frequent surveys
- High data density LWD and drilling optimization applications
- Underbalanced drilling
- Foam and air drilling
- Extreme lost circulation conditions
Tool Specifications
SureShot-EM Technical Data Sheet
General Specifications
| Downhole Transceiver | ||
| Data Rate | 1 to 12 bps uncompressed; selectable | |
| Power Output | 2 to 50 W, selectable | |
| Power Source | 2 - 4x 10 DD lithium battery or APS Turbine Alternator + 1x 10 DD lithium battery | |
| Downlink Methods | EM and flow | |
| Downlink-adjustable Parameters | Data Rate Power Output Operating Frequency Data/Survey Sequences Survey-on-command | |
| Operating Frequency | 2 to 12 Hz; selectable | |
| Collar OD | 8.0 in. 6.75 / 6.50 in. 4.75 in. | 204 mm 172 / 165 mm 121 mm |
| Flow Rate Limits | 8.0 in. – 300 to 1100 gpm 6.75 / 6.50 in. – 150 to 750 gpm 4.75 in. – 125 to 350 gpm | 203 mm – 19 to 69 L/sec 171 / 165 mm – 9 to 47 L/sec 121 mm – 7.9 to 22 L/sec |
| Sand Content | < 1% by volume recommended | |
| Operating Temperature | -13˚ to 302˚F | -25˚ to 150˚C |
| Maximum Pressure | 20,000 psi | 138 MPa |
| Surface System | ||
| Operating Temperature | 32˚ to 158˚F | 0˚ to 70˚C |
| Storage Temperature | 14˚ to 185˚F | -10˚ to 85˚C |
| Surface Sensors | Depth encoder, hookload, standpipe pressure | |
| SureShot MWD with EM | ||
| Downhole Configurations | ||
| Available Platforms | Fixed-mount or retrievable | |
| Fixed-mount System | Battery Battery and PWD Turbine, battery and PWD | |
| Retrievable System | Battery Battery and PWD | |
| Available Sensors | Directional, gamma, vibration, WPR, annular and bore pressure | |
| Length | Equal to mud pulse transmitter; 30 - 31 ft for DGMWD collar | |
| Surface System | ||
| Surface System | Surface receiver, downlink transmitter, laptop, rig floor display | |
| Depth Options | WITS, SureShot Depth Tracker, SIU 1 or SIU 2 | |
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