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Unit 8. Formation Evaluation

Lead-in

Ex. 1. Study the following terms and their definitions.

        1. Coring

core

керн

A sample of formation, usually reservoir rock, taken during or after drilling a well

core plug

образец керна

A sample taken from a conventional core for analysis. Core plugs are typically 2.5 to 3.8 cm in diameter and 5 cm long.

whole core

цельный керн

A complete section of a conventionally drilled core. The section may be up to about 0.6 m in length.

sidewall core

боковой керн

A core taken from the side of the borehole, usually by a wireline tool.

        1. Logging

logging

каротаж

The measurement versus depth or time, or both, of one or more physical quantities in or around a well.

mud logging

анализ бурового раствора

Analysis of drilling mud and cuttings for the presence of hydrocarbons and lithology interpretation.

acoustic (sonic) logging

акустический каротаж

A log that displays travel time of sound waves from the source to the formation and back to a receiver.

density logging

плотностной каротаж

A measurement of the density of the formation, based on the reduction in gamma ray flux between a source and a detector.

gamma ray logging

гамма-каротаж

A log of total natural radioactivity of the formation.

neutron logging

нейтронный каротаж

A log based on the ability of hydrogen to slow down and capture neutrons. Since hydrogen is found mainly in the pore fluids, the neutron log responds principally to porosity.

resistivity logging

каротаж сопротивления

A wireline log of formation resistivity produced by a simple, unfocused arrangement of current emitting and measuring electrodes.

SP logging

каротаж СП

A log of the natural difference in electrical potential between an electrode in the borehole and a fixed reference electrode on the surface.

wireline logging

кабельный каротаж

The type of logging when the logging tool is lowered into the wellbore on an armored wireline.

        1. Parameters in electric logging

conductivity

проводимость

The ability of a material to conduct electricity, the inverse of resistivity.

resistivity

удельное сопротивление

The ability of a material to resist electrical conduction, the inverse of conductivity.

Ex. 2. Match the terms with their Russian equivalents.

  1. acoustic (sonic) logging

  1. каротаж

  1. conductivity

  1. гамма-каротаж

  1. core

  1. плотностной каротаж

  1. core plug

  1. проводимость

  1. density logging

  1. каротаж сопротивления

  1. formation evaluation

  1. нейтронный каротаж

  1. gamma ray logging

  1. керн

  1. log

  1. удельное сопротивление

  1. logging

  1. акустический каротаж

  1. mud logging

  1. зонд

  1. neutron logging

  1. оценка пластовых свойств

  1. resistivity

  1. каротаж СП

  1. resistivity logging

  1. образец (цилиндрик) керна

  1. sonde

  1. каротажная диаграмма

  1. SP logging

  1. анализ бурового раствора

Ex. 3. Fill in the blanks in the following definitions with the appropriate words from the box.

wireline

armoured wireline

gamma ray flux

source

hydrogen

fixed reference

radioactivity

tool

travel time

electrodes

receiver

fluids

density

electric potential

porosity

  1. Acoustic logging – a log that displays (1) __________ of sound waves from the (2) __________ to the formation and back to the (3) __________.

  2. Density logging – a measurement of the (4) __________ of the formation, based on the reduction in (5) __________ between a source and a detector.

  3. Gamma ray logging – a log of total natural (6) __________ of the formation.

  4. Neutron logging – a log based on the ability of (7) __________ to slow down and capture neutrons. Since this element is found in the pore (8) __________, the neutrol log responds principally to (9) __________.

  5. Resistivity logging – a (10) __________ log of formation resistivity produced by a simple, unfocused arrangement of current emitting and measuring (11) __________.

  6. SP logging – a log of natural difference in (12) __________ between an electrode in the borehole and a (13) __________ electrode on the surface.

  7. Wireline logging – the type of logging when the logging (14) __________ is lowered into the wellbore on an (15) __________.

Ex. 4. Reconstruct the definitions with a word or a phrase.

  1. Conductivity – the ability of a material to conduct, the inverse of (1) __________.

  2. Core – a sample of formation, usually (2) __________, taken during or after drilling a well.

  3. Core plug – a sample taken from a (3) __________ core for analysis.

  4. Formation evaluation – the measurement of formation (4) __________ such as porosity, (5) __________, saturation, etc.

  5. Log – the display of one or more on a strip of paper or film (hard copy), with (6) __________ in one axis.

  6. Logging – the measurement versus depth or (7) __________, or both, of one or more physical quantities in or around a well.

  7. Logging run – an operation in which a (8) __________ is lowered into a (9) __________ and then retrieved from the hole while recording (10) ___________.

  8. Mud logging – analysis of (11) __________ and cuttings for the presence of (12) __________ and (13) __________ interpretation.

  9. Resistivity – the ability of a material to resist electrical (14) __________, the inverse of conductivity.

  10. Sidewall core – a core taken from the side of the borehole, usually by a (15) __________ tool.

  11. Sonde – logging tool or section of a logging tool that contains the (16) __________.

  12. Whole core – a complete section of a (17) __________ core. The section may be up to 0.6 m in (18) __________.

Reading and Vocabulary

Ex. 5. Read the text about the tools of formation evaluation.

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