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.
W publikacji przedstawiono technikę i technologię testów DST złoża gazu ziemnego Lachowice-Stryszawa próbnikiem produkcji firmy Halliburton typu Ful-Flo. Podano charakterystykę techniczną tego próbnika oraz zasady kompletowania jego zestawu w zależności od planowanych rozwiązań technologicznych opróbowania i występujących warunków złożowych. Przeanalizowano stosowane w górnictwie naftowym rozwiązania technologiczne oraz rezultaty testów DST gazonośnych utworów dewonu na złożu Lachowice-Stryszawa w obszarze Karpat Zachodnich. Rezultaty tych testów interpretowano metodą Hornera oraz nowoczesną metodą log-log. Zestawiono tabelarycznie i szczegółowo omówiono wyniki interpretacji oraz wyniki obliczeń parametrów złożowych wszystkich udanych technicznie testów DST utworów dewonu, różniących się technologią, ze szczególnym uwzględnieniem przydatności uzyskanych informacji w procesie poszukiwań złóż węglowodorów i oceny ich produktywności.
EN
This paper presents the technique and technology of DST tests made in Lachowice-Stryszawa gas field with the use of Halliburton Ful-Flo equipment. The technical specification of the tester and way in which it can be composed, depending on the planned technological tests and reservoir conditions are given. Technological solutions applied in oil mining and DST results for gas-bearing Devonian strata in the Lachowice-Stryszawa gas field in the Western Carpathians are presented in this paper. The test results were interpreted with Horner method and modern log-log method. The results of the interpretation and calculations of all technically successful DST tests of Devonian strata performed in different technologies were tabularized and discussed in detail taking into account the usability of information in hydrocarbons prospecting and evaluation of their productivity.
Doctor Bolesław Bujalski (1888-1945) graduatedfrom Lviv University to become an outstanding Polish geologist and cartographer. His major fields of expertise included tectonics and structural geology of the Flysch Belt of the Outer Eastern and Western Carpathians and oil potential in these regions. His professional career included work for a petroleum company Towarzystwo Naftowe "Galicja" S.A. and the Polish Geological Institute. During the First World War, he served in the Austro-Hungarian army. Hefought on the Russian and Italian fronts and advanced to the rank ofLieutenant. After the war, in November 1918 Doctor Bujalski he joined the reborn Polish Army in the rank of Captain and took part in a battle called the Defense of Lviv in the Polish historiography. He also fought in the Polish-Soviet War in 1920. For his distinguished merits, he was awarded the highest military distinction of Poland, the Silver Cross of the War Order of"Virtuti Militari". During the Second World War, he headed the Relief Committee of the Central Welfare Council in Stanisławów, a charity organization operating in Poland under the German occupation. He tried to continue these activities after the entry of the Red Army into the Stanisławów area in 1944 to be soon arrested by the Soviet security services (NKVD) and die in a jail most probably in early 1945.
W artykule przedstawiono analizę możliwości technicznych i technologicznych stosowania rurowych próbników złoża produkcji firmy Halliburton typu Ful-Flo w poszukiwaniach naftowych. Podano charakterystykę techniczną tego próbnika oraz zasady kompletowania jego zestawu w zależności od planowanych rozwiązań technologicznych opróbowania. Opracowano przykład przemysłowy zastosowania próbnika typu Ful-Flo w otworze wiertniczym L-7, do opróbowania utworów dewonu w Karpatach Zachodnich.
EN
The technical and technological applicability of Halliburton drill stem testers of Ful-Flo type for oil prospecting has been analyzed in the paper. The technical characteristic of the device and principle of assembling the set up are given in view of the planned technological testing solutions. An exemplary industrial application of a DST Ful-Flo type in a well L-7 has been used for testing the Devonian strata in the Western Carpathians.
Szeroki zakres zastosowań w inżynierii otworowej i złożowej mają nowoczesne, rurowe próbniki złoża typu Inflatable produkcji amerykańskiej firmy Baker-Lynes. W niniejszej publikacji przedstawiono technikę i technologię wykonywania testów złożowych, na podstawie doświadczeń przemysłowych uzyskanych przez Poszukiwania Nafty i Gazu Kraków, gdzie próbniki te są stosowane od 1992 roku. Podano także zasady doboru zestawu próbnikowego w zależności od warunków geologicznych oraz stanu technicznego otworu wiertniczego.
EN
Novel drill stem testers "Inflatable" by an American company Baker-Lynes are widely applicable to borehole and reservoir engineering. Testing techniques and technologies based on industrial experience (since 1992) of the Polish Oil and Gas Prospecting Company, Cracow are presented in the paper. The DST selection principles in view of geologic conditions and technical state of the borehole are also discussed.
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