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Stabilisation of the Shyrak 1 well. Very good reservoir properties of rocks. |
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Own release
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06.09.2011 |
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Further to current reports no. 77/2011 of 16 August 2011 and 81/2011 of 23 August 2011 concerning the results of interpretation of logs performed in the Shyrak 1 well by Schlumberger and the occurrence of a strong and steady flow of gas with condensate content which, combined, indicate that a pool has been discovered, the Management Board of PETROLINVEST S.A. (the “Company”) announces that on 6 September 2011, it received the following information from TOO OilTechnoGroup, a Kazakh law company controlled by the Company:
1) OTG has completed all the works aimed at stabilising the Shyrak 1 well following the occurrence of a strong flow of gas with condensate content, which the Company announced in the current report no. 81/2001.
2) the core barrel was pulled out from the Shyrak 1 well with drill core extracted at the depth of 6,593.6 – 6,597.1 metres, indicating very good reservoir properties of rocks.
3) preparatory works were concluded that preceded the casing of a 7-inch diameter column and on 6 September 2011 the casing of the column commenced. Stabilisation of the well was achieved by using drilling mud with the weight of 2.13 g/cm3. The formation pressure at the bottom of the well was estimated at approximately 1,400 atmospheres.
The core barrel yielded 3.3 metres of drill core. This amount of drill core was extracted in spite of the fact that flushing of the well had been performed during a number of days, which had been necessary following the strong flow of gas that occurred during the extraction of the core (of which the Company informed the public in the current report no. 81/2011). The rocks in the drill core are very heavily cracked and contain numerous cavities with a diameter of up to 2 cm. In the core visual traces of hydrocarbons were also found, with samples of the extracted rocks displaying a glow typical of liquid hydrocarbons under ultraviolet light.
The presence of fissures and cavities in the core confirms earlier observations that indicated very good reservoir properties of the layers that have been drilled through, which were based, among other things, on the occurrences of inflow of gas into the well, the escape of drilling mud and the results of logs performed in the well. The rock samples extracted from the core make it possible to visually confirm the presence of fissuring and cavities in the rocks. Combined, these facts portend very well for the outcome of the tests to be carried out in the future.
Following the extraction of the drilling assembly together with the core barrel the casing of a 7-inch diameter column commenced. Download current report no. 91/2011 |
