A downhole connection includes a rotating member and an independently rotating member. A solenoid is connected to the independently rotating member and a moving member is connected to the rotating member. The moving member is movable by the solenoid and connected to an actuation valve of a downhole tool on the rotating member.

A downhole connection includes a rotating member and an independently rotating member. A solenoid is connected to the independently rotating member and a moving member is connected to the rotating member. The moving member is movable by the solenoid and connected to an actuation valve of a downhole tool on the rotating member.

A system for downhole communication includes a roll stabilized platform and a mud pulse generator in communication with the roll stabilized platform. The mud pulse generator generates pressure pulses in a pattern that includes encoded data. A receiver receives the pressure pulses and the encoded data is decoded. The receiver is located at any location capable of receiving pressure pulses.

A system for downhole communication includes a roll stabilized platform and a mud pulse generator in communication with the roll stabilized platform. The mud pulse generator generates pressure pulses in a pattern that includes encoded data. A receiver receives the pressure pulses and the encoded data is decoded. The receiver is located at any location capable of receiving pressure pulses.

A downhole communication system includes a mud pulse generator that generates a set of pressure pulses in a pattern, the pattern including encoded data. A roll stabilized platform includes a turbine that is rotatable in response to the pressure pulses. The rotational rate of the turbine is correlated with a pressure value. A processor on the roll stabilized platform demodulates the pressure pulse pattern, and then decodes the encoded data.

A downhole communication system includes a mud pulse generator that generates a set of pressure pulses in a pattern, the pattern including encoded data. A roll stabilized platform includes a turbine that is rotatable in response to the pressure pulses. The rotational rate of the turbine is correlated with a pressure value. A processor on the roll stabilized platform demodulates the pressure pulse pattern, and then decodes the encoded data.

Various embodiments include apparatus and methods to estimate properties of rock, drill bit, or a combination thereof associated with a drilling operation. The properties can include, but are not limited to, rock chip size, drill bit dullness, drilling efficiency, or a combination selected from rock chip size, drill bit dullness, and drilling efficiency. The estimate may be accomplished from correlating detected acoustic emission with detected electromagnetic emissions. In various embodiments, formation brittleness may be determined. The various estimates may be used to direct a drilling operation. Additional apparatus, systems, and methods are disclosed.

Various embodiments include apparatus and methods to estimate properties of rock, drill bit, or a combination thereof associated with a drilling operation. The properties can include, but are not limited to, rock chip size, drill bit dullness, drilling efficiency, or a combination selected from rock chip size, drill bit dullness, and drilling efficiency. The estimate may be accomplished from correlating detected acoustic emission with detected electromagnetic emissions. In various embodiments, formation brittleness may be determined. The various estimates may be used to direct a drilling operation. Additional apparatus, systems, and methods are disclosed.

A method includes acquiring data associated with a field operation of equipment in a geologic environment; filtering the data using a filter where the filter includes, along a dimension, a single maximum positive value that decreases to a single minimum negative value that increases to approximately zero; and, based on the filtering, issuing a control signal to the equipment in the geologic environment.

A method includes acquiring data associated with a field operation of equipment in a geologic environment; filtering the data using a filter where the filter includes, along a dimension, a single maximum positive value that decreases to a single minimum negative value that increases to approximately zero; and, based on the filtering, issuing a control signal to the equipment in the geologic environment.