PP-MWD

The positive pulse measurement while drilling system (PP-MWD) principle is based on the temporary restriction of drillstring mud flow to create a series of pressure spikes that form a communicative pulse waveform that is decoded using surface equipment. Downhole configurations are fully modular adding the flexibility of adjustments specific to BHA. Reliable surface decoding is further enhanced with the added option of wireless systems for long-range communication between rig and command center. Quality sensor measurement is made possible through industry standard magnetometer and accelerometer packages, including API standardized gamma ray modules. Downhole tool is fully retrievable and reinsertable for added confidence in lost in hole situations. PP-MWD applications are available with the optional rotary flow switch (RFS) that can significantly improve run durations and reduce unnecessary pulser operation by switching tool into standby mode under rotation.

Features & Benefits

High operating temperature (175°C) and pressure (20,000psi).
Wireline retrievable and reinsertable design (minimum 2.25in I.D.).
Available real-time gamma measurements for LWD (focus gamma available) Downlink capability for selectable operating modes Proven software and firmware for efficient decoding.
Adaptable tool configurations and programming flexibility.
Long battery life with Rotary Flow Switch (RFS) option Reliable, proven rugged design Mud telemetry not affected by formation or drilling fluid resistivity.

PP-MWD Colombia

Specifications

Data Transmission Type	Positive Mud Pulse
Collar Sizes	89mm-203mm (3.50in-8.00in) Additional sizes available
Operating Flow Rate	0.28-4.54m3/min (75-1200gpm)
Wireline Retrievability	Retrievable and Reinsertable
Minimum ID for Retrievability	57mm (2.25in)
Flow Switch	Vibration
Nominal Length	9.75m (32ft), 11.88m (39ft) w/gamma
Housing O.D.	47.625mm (1.875in)
Power Supply	Lithium 28VDC/3amp (21VDC/5amp available)
Shock Limit	1000g, 0.5msec, ½ sine all axes
Vibration Limit	5-30Hz@1in double amplitude, 30-500Hz 20g all axes
Operating Temperature (max)	150°C (302°F), 175°C (347°F) available
Hydrostatic Pressure (max)	137,895kPa (20,000 psi)
Pressure Drop (6.50in w/Water)	689kPa@1.51m3/min (100psi@400gpm)
Velocity Rate (max)	10m/sec (32ft/sec)
Bend Radius (max)	20deg/10m
LCM Tolerance (max)	40-50ppb concentration, any size, premixed
Operating Pulse Width	0.600-2.00sec
Data Update Rate	10-28sec
Survey Transmission Rate	<120sec (resolution and pulse width dependent)
Toolface Accuracy	0-360° +/- 0.50°
Inclination Accuracy	0-180° +/- 0.10°
Azimuth Accuracy	0-360°+/- 0.25°
Survey Procedure	Rotary OFF > Pumps OFF > Hold 60sec > Pumps ON > Survey Sequence Received > Steering Sequence Received
Operational Modes	Operator-selectable survey and steering sequences, resolution and pulse width settings
Downlink Capability	Pumps ON/OFF sequences for mode-selection, steering and survey sequences, and pulse width settings
BHA Configuration	UBHO – NMDC – NMDC
BHA Landing	Bottom Landing
Tool Configuration (Standard)	Pulser – Battery(1) – Directional Module – Battery(2)
Tool Configuration (Gamma)	Pulser – Gamma – Directional Module – Battery(2) – Battery(1)
Rotary Power Save Mode	Yes (RFS available)
Battery Consumption	220-320hrs (medium-rate dual battery), 180-260hrs (medium-rate dual battery w/gamma). Consumption factors include resolution and pulse width settings.