Abstract: Systems and methods for inter-tool communication in toolbus systems in cable telemetry. The systems can include downhole equipment deployable into a wellbore via a cable, The downhole equipment can include a toolbus, a toolbus master node including a buffer, and nodes operatively coupled to the toolbus master node via the toolbus. Each of the nodes includes a buffer. Of the one or more nodes, a sending node sends a message, and a receiving node receives the message via the toolbus master node and sends a buffer full message to the toolbus master node when the buffer of the receiving node is full. The toolbus master node sends a buffer full message to the sending node and the receiving node when the buffer of the receiving node is full, and buffers the message at the toolbus master node until the receiving buffer is not full.

Abstract: Toolstring topology mapping systems having a downhole toolstring including a master node controller and a plurality of nodes and related methods. The methods involve querying each of the plurality of nodes in the downhole toolstring for actual topology information, receiving actual topology information from each of the plurality of nodes in the downhole toolstring in response to querying, and generating a topology map of the downhole toolstring based on the actual topology information from each of the plurality of nodes in the downhole toolstring. The methods can also involve comparing the topology map with the input topology information to identify topology mismatch and then take remedial actions if needed.

Abstract: Systems and methods for toolstring communication in cable telemetry. The methods involve positioning a cable telemetry system in a wellbore. The cable telemetry system can include a surface modem, a downhole toolstring of downhole tools, a downhole modem operatively coupled to the downhole toolstring, a cable operatively coupling between the surface modem and the downhole modem, and a surface data routing module that polls and trains the cable telemetry system. The methods also involve performing a pre-transmission poll of a rate requirement for the downhole toolstring and a telemetry type for the downhole modem, applying a training phase to establish a transmission link between the surface modem and the downhole modem, configuring data obtained by the downhole toolstring for an uplink via the transmission link, and transmitting the uplink via the transmission link.

Abstract: Cable telemetry synchronization systems and methods. The synchronization can involve positioning downhole equipment into a wellbore via a cable operatively coupled to a surface module that can include a telemetry system master clock. The downhole equipment can include a toolbus master node and at least one slave node module having a node clock operatively coupled to the toolbus master node. The synchronization can also involve sending a frame start command to the at least one slave node module from the toolbus master node at predetermined intervals, receiving a clock value from each of the at least one slave node module, calculating a clock offset for each of the at least one slave node module, and sending an absolute clock value and the calculated clock offset for each of the at least one slave node module via a downlink synchronization command to the at least one slave node module.

Abstract: Systems and methods for inter-tool communication in toolbus systems in cable telemetry. The systems can include downhole equipment deployable into a wellbore via a cable, The downhole equipment can include a toolbus, a toolbus master node including a buffer, and nodes operatively coupled to the toolbus master node via the toolbus. Each of the nodes includes a buffer. Of the one or more nodes, a sending node sends a message, and a receiving node receives the message via the toolbus master node and sends a buffer full message to the toolbus master node when the buffer of the receiving node is full. The toolbus master node sends a buffer full message to the sending node and the receiving node when the buffer of the receiving node is full, and buffers the message at the toolbus master node until the receiving buffer is not full.

Abstract: A multi-scheme downhole tool bus system is provided. The system may comprise a tool bus master and a number tool bus slaves coupled together via a communications link The communications link may include an uplink communication and a downlink communication. The uplink communication and the downlink communication may include a number of communication schemes or data rates.

Abstract: Systems and methods for toolstring communication in cable telemetry. The methods involve positioning a cable telemetry system in a wellbore. The cable telemetry system can include a surface modem, a downhole toolstring of downhole tools, a downhole modem operatively coupled to the downhole toolstring, a cable operatively coupling between the surface modem and the downhole modem, and a surface data routing module that polls and trains the cable telemetry system. The methods also involve performing a pre-transmission poll of a rate requirement for the downhole toolstring and a telemetry type for the downhole modem, applying a training phase to establish a transmission link between the surface modem and the downhole modem, configuring data obtained by the downhole toolstring for an uplink via the transmission link, and transmitting the uplink via the transmission link.

Abstract: Toolstring topology mapping systems having a downhole toolstring including a master node controller and a plurality of nodes and related methods. The methods involve querying each of the plurality of nodes in the downhole toolstring for actual topology information, receiving actual topology information from each of the plurality of nodes in the downhole toolstring in response to querying, and generating a topology map of the downhole toolstring based on the actual topology information from each of the plurality of nodes in the downhole toolstring. The methods can also involve comparing the topology map with the input topology information to identify topology mismatch and then take remedial actions if needed.

Abstract: A downhole characterization apparatus for formation fluids is provided. The apparatus comprises a downhole tool including a flowline for flowing the formation fluids capable of isolating a quantity of the formation fluids in a portion thereof; and a pump unit for depressurizing the isolated formation fluids; and a measurement controller which controls the downhole tool. The measurement controller includes a rough value estimation unit which estimates a rough value of the bubble point pressure of the formation fluids; and a speed controller which controls the depressurizing speed of the pump unit such that the isolated formation fluids are depressurized at a first speed to a certain pressure which is a predetermined value higher than said estimated rough value, and the isolated fluids are depressurized at a second speed which is slower than said first speed in order to measure a precise value of the bubble point pressure.

Abstract: A downhole characterization apparatus for formation fluids is provided. The apparatus comprises a downhole tool including a flowline for flowing the formation fluids capable of isolating a quantity of the formation fluids in a portion thereof; and a pump unit for depressurizing the isolated formation fluids; and a measurement controller which controls the downhole tool. The measurement controller includes a rough value estimation unit which estimates a rough value of the bubble point pressure of the formation fluids; and a speed controller which controls the depressurizing speed of the pump unit such that the isolated formation fluids are depressurized at a first speed to a certain pressure which is a predetermined value higher than said estimated rough value, and the isolated fluids are depressurized at a second speed which is slower than said first speed in order to measure a precise value of the bubble point pressure.

Abstract: A method of downhole characterization of formation fluids is provided. The method includes: estimating a rough value of the bubble point pressure of the formation fluids; depressurizing the formation fluids at a first speed to a certain pressure which is a predetermined value higher than the estimated rough value while the formation fluids are isolated in a portion of the flowline; and depressurizing the isolated fluids at a second speed which is slower than the first speed in order to measure a precise value of the bubble point pressure.

Abstract: An apparatus for performing real-time analysis of a subterranean formation fluid includes a light source configured to transmit at least a sample signal through a sample of the subterranean formation fluid and a reference signal, at least one photodetector configured to continuously detect the sample and reference signals, and an electronics assembly configured to compensate for drift in the detected sample signal in real-time based on the value of the detected reference signal.

Abstract: A method of downhole characterization of formation fluids is provided. The method includes: estimating a rough value of the bubble point pressure of the formation fluids; depressurizing the formation fluids at a first speed to a certain pressure which is a predetermined value higher than the estimated rough value while the formation fluids are isolated in a portion of the flowline; and depressurizing the isolated fluids at a second speed which is slower than the first speed in order to measure a precise value of the bubble point pressure.

Abstract: An apparatus for performing real-time analysis of a subterranean formation fluid includes a light source configured to transmit at least a sample signal through a sample of the subterranean formation fluid and a reference signal, at least one photodetector configured to continuously detect the sample and reference signals, and an electronics assembly configured to compensate for drift in the detected sample signal in real-time based on the value of the detected reference signal.

Abstract: For various reasons it may be desirable to change the way a sonde is programmed to behave and respond to the data it receives and operates on, and at present each time this must be done it has been necessary to lift the sonde out of the borehole and then disassemble it to permit the removal of the old ROM and its replacement with a new ROM storing the new program. The operability and efficiency of such an arrangement is poor. To deal with this, the present invention proposes that the sonde also includes: signal processing means for processing a sampled detection signal according to a predetermined signal processing program; first memory means for storing that signal processing program; and second memory means storing a writing program for writing the signal processing program in the first memory means according to a command from the ground surface processing apparatus.