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Drill Stem Tests

Formation evaluation by obtaining samples of formation fluid and formation pressure data is made possible by drill stem testing procedures. The testing equipment is lowered into the wellbore on the drill pipe and put into place by seating a packer that seals off formation from contamination by drilling mud. The tool is opened and fluid samples and pressure data are obtained.

Drill stem tests are run in wells in which promising hydrocarbon shows (indications) are encountered in cores and samples. Segregation of the individual formations produces results from specific intervals. Pressure data are evaluated to determine the productive potential of the formation being tested. These data and fluid information can facilitate decisions on how the well is to be completed: as a producing well or as a dry hole to be plugged and abandoned.

Development of an individual reservoir can also be increased by evaluation of pressure and fluid data. Data similarities suggest the same reservoir. Dissimilar data are potentially indicative of separate reservoirs, permeability barriers or contamination.

(http://www.wikipedia.org)

2. Define the following terms with their similar meaning in Russian.

mud logging

core barrel

coring

specimen

technique

productive

cylinder

potential

packer

3. Give the Russian equivalent to the following terms.

a ring shaped, diamond chip studded bit

slight uncertainty about the sample depth

core barrel jams

danger of differential sticking

bullets are moored to the gun

depth accuracy is important

misfired bullets

coherent rock

4. Find the answers to the following questions.

1. How are the samples of the formation at a certain depth obtained?

2. What techniques are commonly used at present?

3. What is the length of a core barrel?

4. What does the length of the core barrel depend on?

5. Why is taking a full core an expensive operation?

6. Do you know any cheaper coring technique?

7. Cores are not preferable to well cuttings, are they?

8. Are cores hard to store?

9. What are the advantages and disadvantages of coring?

10. Is formation evaluation possible to obtain by other tests?

11. What data can facilitate decisions on how the well is to be completed?

12. Can development of an individual reservoir be increased? Prove this.

Terms and Vocabulary

logging

геофизические исследования в скважинах, каротаж

wireline well-logging technique

канатный метод каротажа

acoustic velocity

акустическая скорость

velocity асoustic log

диаграмма акустического каротажа по скорости

resistivity

удельное сопротивление

caliper log

кавернограмма

drilling site

буровая площадка

mudcake

глинистая корка (образующаяся на стенках скважины в результате фильтрации промывочной жидкости в области пористых и проницаемых отложений )

mud filtrate

фильтрат бурового раствора

flushed zone

зона проникновения фильтрата (бурового раствора )

invaded zone

зона проникновения ( фильтрата бурового раствора )

spontaneous (Self) Potential Log (SP Log)

диаграмма каротажа потенциалов самопроизвольной поляризации

resistivity log

каротаж по методу сопротивления

conductivity

удельная проводимость

induction electrical log

диаграмма индукционного каротажа

uninvaded zone

не затронутая проникновением зона

radioactivity log

диаграмма радиоактивного каротажа (гамма–каротажа)

gamma-ray log density log

диаграмма гамма–каротажа плотности

neutron log

диаграмма нейтронного каротажа

density log

диаграмма плотностного каротажа

sonic log

акустический каротаж

acoustic log

диаграмма акустического каротажа

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