Downlink telemetry system

A system for generating a signal for communicating with a downhole assembly comprising:

• a transmitter for generating said signal in a flow of fluid being directed downhole;
• a control system fir operating said transmitter without stopping said pumping;
• and
• a downhole receiver for receiving said signal and decoding said signal;
• wherein said transmitter comprises;
• a flow control device being moveable between an open position and a closed position;
• said open position allowing a quantity of said fluid to flow through a bypass line;
• a flow restrictor that sets said quantity;
• a flow diverter;
• and
• a backpressure device.

A system for generating a signal for communicating with a downhole assembly comprising:

• a transmitter for generating said signal in a flow of fluid being directed downhole;
• a control system for operating said transmitter without stopping said pumping;
• and
• a downhole receiver for receiving said signal and decoding said signal;
• wherein said transmitter comprises:
• a first flow control device having an open position and a closed position;
• said open position allowing a quantity of said fluid to flow through a first bypass line;
• a first flow restrictor that sets said quantity;
• a second flow control device having an on and an off position;
• said on position allowing a percentage of said fluid to flow through a second bypass line when said first flow control device is in the open position;
• and
• a second flow restrictor that sets said percentage.

A system for generating a signal for communicating with a downhole assembly comprising:

• a transmitter for generating said signal in a flow of fluid being directed downhole;
• a control system for operating said transmitter without stopping said pumping;
• and
• a downhole receiver for receiving said signal and decoding said signal;
• wherein said control system comprises:
• a computer for inputting an instruction;
• and
• a downlink controller for receiving said instruction from said computer and operating said transmitter to generate said signal.

The system of claim 33 wherein said pneumatic assembly comprises:

• a pair of air valves;
• a manual override manifold;
• and
• air lines including quick connect fittings.

A system for generating a signal in a flow of fluid being directed downhole for communicating with a downhole assembly comprising:

• means for bypassing a quantity of fluid to generate said signal without stopping the pumping of said fluid;
• means for restricting the quantity of fluid being bypassed;
• and
• means for receiving said signal and decoding said signal into said instruction.

A system for communicating with a downhole assembly comprising:

• a transmitter for generating a signal in a flow of fluid being directed downhole;
• said transmitter comprising a flow control device and a flow restrictor;
• a control system for operating said transmitter without stopping the fluid being pumped downhole;
• said control system comprising a computer and a downlink controller;
• and
• a downhole receiver for receiving said signal and decoding said signal;
• said downhole receiver comprising a pressure sensor.

A system for sending simultaneous, bi-directional signals between a surface assembly and a downhole assembly comprising:

• a pump for continuously pumping a fluid between a surface location and a downhole location;
• a bypass line for generating a downlink signal within a first frequency band without stopping said pump;
• and
• a pulser for generating an uplink signal within a second frequency band;
• wherein said downlink signal and said uplink signal are generated simultaneously.

A system for receiving and decoding a pressure pulse signal into an instruction to a downhole assembly comprising:

• a receiver for receiving said signal;
• and
• an algorithm for decoding said signal;
• said decoding comprising:
• filtering said signal to generate a filtered signal;
• cross-correlating said filtered signal using a template waveform to generate a processed signal;
• determining said instruction from said processed signal;
• and
• performing an error check to ensure said instruction was properly determined.

A system for receiving and decoding a pressure pulse signal into an instruction to a downhole assembly comprising:

• a receiver for receiving said signal;
• and
• an algorithm for decoding said signal downhole;
• said decoding comprising;
• filtering said signal to generate a processed signal;
• and
• determining said instruction from said processed signal.

A method for communicating with a subsurface assembly comprising:

• introducing a series of pressure pulses into a fluid being pumped into a well without interrupting the pumping;
• receiving downhole a signal that includes the series;
• and
• decoding the signal.
• wherein each pulse has a duration above the shock wave regime.

A method of achieving simultaneous, bi-directional communication between a surface system and a downhole assembly comprising:

• transmitting to the downhole assembly a downlink series of pulses within a first frequency band;
• transmitting to the surface system an uplink series of pulses within a second frequency band;
• receiving a first signal at the downhole assembly;
• and
• receiving a second signal at the surface system.

A method for drilling a borehole comprising:

• transmitting to a drilling assembly a series of downlink instruction signals;
• and
• optionally transmitting from the drilling assembly a series of uplink data signals;
• wherein said downlink instruction signals and said uplink data signals may be transmitted simultaneously.

A method for drilling an accurately located well borehole at a drilling site that is optimized for minimum drag and maximum drilling efficiency comprising:

• transmitting to a drilling assembly a series of downlink instruction signals;
• and
• selectively transmitting from the drilling assembly a series of uplink data signals;
• wherein said downlink instruction signals and said uplink data signals may be transmitted simultaneously.