Abstract: A system for pump down operations in a wellbore includes a tool string disposed in a wellbore, said tool string including a cable head having an upper end coupled to an electric wireline cable, a downhole tool coupled to the cable head, the downhole tool selected from the group consisting of perforating tools and down-hole logging tools, and a downhole tension sensor located proximal to the upper end of the cable head, said sensor adapted to obtain downhole wireline tension data and transmit the downhole wireline tension data via the electric wireline cable, a fluid pump with a fluid output operatively connected to the wellbore above the tool string, and a controller adapted to selectively adjust a pump fluid output rate of the fluid pump during pump down operations based on the downhole wireline tension data received from the downhole tension sensor.

Abstract: A system is disclosed that includes a tool string including one or more perforating guns, a conveyance operably coupled to the tool string at a socket coupling location and configured to help convey the tool string downhole, a load-measuring device arranged on the tool string and including one or more tension sensors configured to measure tensile load on the conveyance, the load-measuring device further including communication equipment capable of transmitting one or more uphole signals, wherein the one or more uphole signals includes measurement signals corresponding to the tensile load, and a computer system locatable at or near the surface location and communicably coupled to the tool string, the computer system being configured to receive and process the one or more uphole signals and further configured to transmit one or more downhole signals to the tool string to operate the one or more perforating guns.

Abstract: A system for pump down operations includes a diversion valve unit that is adjustable between a pumping position and a diversion position and a controller coupled to the diversion valve unit. The system further includes a fluid reservoir, a downhole fluid path between the fluid reservoir and a tool downhole, a driving unit in the downhole fluid path for advancing the tool, and a diversion fluid path between a portion of the downhole fluid path downstream of the driving unit and the fluid reservoir or another fluid receptacle. The diversion valve is in the diversion fluid path and the controller automates the diversion valve position for the diversion valve unit based on a monitored wireline speed or a monitored wireline tension for a wireline unit.

Abstract: A method of correcting a downhole speed of a tool string moving in a wellbore. In some implementations, the method includes obtaining a downhole tool speed with an accelerometer, moving the tool string past at least two casing collars, calculating the average tool speed over the interval between collars, and comparing the downhole tool speed as calculated using the data from the accelerometer to the average tool speed calculated based on the time and the interval between the casing collars, determining a correction factor, and determining a corrected downhole tool speed. A system includes a casing collar locator, an accelerometer, and a processor adapted to compare the downhole tool speed calculated using data from the accelerometer to the average downhole tool speed calculated using the time and casing collar location, determine a correction factor and determine a corrected downhole tool speed.

Abstract: A method of correcting a downhole speed of a tool string moving in a wellbore includes inserting a tool string into a proximal upper end of the wellbore, spooling out cable at the surface allowing the tool string to move into the wellbore, obtaining a downhole tool speed with an accelerometer and providing said data to a processor that calculates the downhole speed of the tool string based on the accelerometer data, moving the tool string past at least two casing collars and sending data to the processor including the depth of each of the collars and time that the casing collar locator passes each of the casing collars, calculating the average tool speed over the interval between collars, and comparing the downhole line speed as calculated using the data from the accelerometer to the average tool speed calculated based on the time and casing collar.