Analysis of selected problems encountered while testing natural gas-condensate fields in the Western Carpathians
PBN-AR
Instytucja
Wydział Wiertnictwa, Nafty i Gazu (Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie)
Informacje podstawowe
Główny język publikacji
EN
Czasopismo
AGH Drilling, Oil, Gas
ISSN
2299-4157
EISSN
2300-7052
Wydawca
Wydawnictwa AGH
DOI
Rok publikacji
2015
Numer zeszytu
3
Strony od-do
575--580
Numer tomu
32
Link do pełnego tekstu
Identyfikator DOI
Liczba arkuszy
0.42
Słowa kluczowe
EN
oil prospecting
Western Carpathians
gas-bearing Devonian strata
natural gas-condensate field in Stryszawa
testing technology
thermodynamic conditions of gas condensation
Open access
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Razem z publikacją
Streszczenia
Język
EN
Treść
The potential change of natural gas composition in the near-wel lbore zone creates a big problem with the selection of appropriate initial value of counterpressure exerted by the displacement fluid on reservoir during the test, and also with the interpretation of the reservoir and production tests results. The analysis of the industrial data reveals that the effect of condensate production in the near-wellbore zone could take place while using too high counterpres-sure during DST tests, as a consequence of using a relatively high column of water displacement fluid in the DST column, i.e. about 2500 m. This thesis can be confirmed after further detailed theoretical analysis of the occurring thermodynamic conditions. The paper addresses technological and interpretation problems encountered during drill stem tests (DST) of gas-bearing Devonian strata, on the example of the Stryszawa field in the Western Carpathians. Special attention was paid to the possible changes of gas compo sition during flow tests and the cases of gas condensation of heavier fractions during build-up tests. Attempts were made at explaining sudden drops of pressure at the build-up stage along with the thermodynamic conditions responsible for this effect. The authors explained the necessity of using an appropriate Ful-Flo sampler in the DST set for collecting gas samples at any time of the test, and devices for continuous measurement of temperature. The use of new types of drill stem testers and appropriate interpretation methods, which would account for a detailed analysis of technological and reservoir conditions allows for more efficient oil prospecting and deciding about enhancement methods in hydrocarbon production. The analysis of thermodynamic conditions on the bottom of the wellbore allow s for selecting proper counterpressure values in view of the condensation of heavier gas fractions in the near wellbore rocks. The analysis of conditions in which heavier gas fractions undergo condensation is approximate and general because the gas samples were collected at the outlet of the DST string (in surface conditions), without a Ful-Flo sampler and without temperature measurements.
Cechy publikacji
original article
peer-reviewed
Inne
System-identifier
idp:097767
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