Hydraulically balanced reciprocating pulser valve for mud pulse telemetry

A method for generating a fast transition in a phase shift key encoding (PSK) scheme for mud pulse telemetry, comprising;

• utilizing a linear electric motor for driving a reciprocating poppet in a first direction and then in a reverse second direction to generate pressure pulses in a drilling fluid;
• driving the poppet with a first predetermined signal phase relationship;
• changing the drive signal according to the PSK scheme at a predetermined poppet position;
• and
• attaining a second predetermined phase relationship in no more than one poppet oscillatory period.

A method for generating a fast transition in a frequency shift key encoding (FSK) scheme for mud pulse telemetry, comprising;

• utilizing a linear electric motor for driving a reciprocating poppet in a first direction and then in a reverse second direction to generate pressure pulses in a drilling fluid;
• driving the poppet at a first frequency;
• changing the drive signal according to the FSK scheme at a predetermined poppet position;
• and
• attaining a second predetermined frequency in no more than one poppet oscillatory period.

A method for generating a fast transition in an amplitude shift key encoding (ASK) scheme for mud pulse telemetry, comprising;

• utilizing a linear electric motor for driving a reciprocating poppet in a first direction and then in a reverse second direction to generate pressure pulses in a drilling fluid;
• driving the poppet a first predetermined travel distance;
• changing the drive signal according to the ASK scheme at a predetermined poppet position;
• and
• attaining a second predetermined travel distance in no more than one poppet oscillatory period.

A method for generating an increased data rate in a mud pulse telemetry scheme by combining an amplitude shift key encoding (ASK) scheme and a frequency shift key encoding scheme (FSK), comprising;

• utilizing a linear electric motor for driving a reciprocating poppet in a first direction and then in a reverse second direction to generate pressure pulses in a drilling fluid;
• driving the poppet in a reciprocating motion through a first travel distance at a first frequency, thereby generating a first pulse amplitude at a first frequency;
• changing the drive signal according to the ASK and FSK schemes at a predetermined poppet position;
• and
• driving the poppet in a reciprocating motion through a second travel distance at a second frequency, thereby attaining a second pulse amplitude at a second frequency in no more than one poppet oscillatory period.

A method for generating an increased data rate in a mud pulse telemetry scheme by combining an amplitude shift key encoding (ASK) scheme and a phase shift key encoding scheme (PSK), comprising;

• utilizing a linear electric motor for driving a reciprocating poppet in a first direction and then in a reverse second direction to generate pressure pulses in a drilling fluid;
• driving the poppet in a reciprocating motion through a first travel distance at a fixed frequency at a first phase angle, thereby generating a first pulse amplitude at a first phase angle;
• changing the drive signal according to the ASK and PSK schemes at a predetermined poppet position;
• and
• driving the poppet in a reciprocating motion through a second travel distance at the fixed frequency at a second phase angle, thereby attaining a second pulse amplitude at a second phase angle in no more than one poppet oscillatory period.