PART 4

Question 1

With reference to multiphase flow in pipes, the fraction of a particular fluid present in an interval of pipe

Answer 1

holdup

Question 2

A two-dimensional display, using colors or different grey scales, of the holdup around the borehole versus depth

Answer 2

holdup image / holdup map

Question 3

A record of the fractions of different fluids present at different depths in the borehole

Answer 3

holdup log

Question 4

A device for determining the water holdup in a producing well by measuring the capacitance or impedance of the fluid

Answer 4

holdup meter / capacitance meter / water cut meter

Question 5

A device that responds to fluid flow and is used as the sensor in a flowmeter

Answer 5

impeller

Question 6

A type of oxygen activation technique for measuring water flow in which a short neutron burst is followed by a long observation period, during which the activated flowing oxygen is recognized at the detector by its signature

Answer 6

impulse activation

Question 7

An in-situ recording in which a material with high neutron-capture cross section is injected into the flowstream of a production or injection well to determine fluid paths and velocities

Answer 7

injection pulsed neutron log

Question 8

A technique for improving the accuracy of injection profiles measured using the velocity-shot method

Answer 8

interval method

Question 9

Referring to the change in temperature observed when a gas expands while flowing through a restriction without any heat entering or leaving the system

Answer 9

Joule Thomson

Question 10

In a gradiomanometer tool, the pressure difference observed when the fluid velocity opposite the upper pressure sensor differs from that across the lower pressure sensor

Answer 10

kinetic effect

Question 11

A type of streamlined flow for single-phase fluids in which the fluid moves in parallel layers, or laminae

Answer 11

laminar flow

Question 12

The fraction of a particular fluid measured in the vicinity of a small probe in a production well

Answer 12

local holdup

Question 13

A small sensor, part of a production logging tool, which determines the type of fluid in its vicinity as it moves up and down a production well

Answer 13

local probe / optical probe

Question 14

The apparent increase in thickness of a casing or tubing string compared to the assumed value

Answer 14

metal gain

Question 15

The loss of material on the inside or outside of a casing or tubing due to corrosion

Answer 15

metal loss / wall loss