Wyniki wyszukiwania - Biblioteka Nauki

1

Brown field rehabilitation success through an effective project management system

100%

Sasu R. , Tataru A.

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tom Vol. 34, no. 2

577--586

EN

Laslau Mare is a mature gas field in Transylvania Basin. The field exploitation began in 1975 and has been operated since then by Romgaz. In 2004 Romgaz entered into an Association agreement with Schlumberger to rehabilitate Laslau Mare field. Association’s main goals for project rehabilitation has been maximization of field potential by increasing gas production and reservoir ultimate recovery factor. The incremental production, defined as the additional gas volume obtained above a production baseline negotiated at project inception is the key objective of Association. According to Project Management Body of Knowledge (PMBOK®) framework from the Project Management Institute (PMI), the project management breaks in processes groups, knowledge area and professional and social responsibility all of them being integrated in a system approach. This paper examines key aspects of the project management system processes, adapted to the oil and gas industry and implemented in our project to meet and exceed project goals.

2

The maximization of the ultimate recovery factor in mature gas reservoirs implementing wellhead and field compression

80%

Stefanescu D.-P. , Tataru A. , Rotar D. , Popa A.-M.

Wiertnictwo, Nafta, Gaz

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2008

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tom T. 25, z. 2

659-665

EN

Mature fields contribute more than 50% of the world's gas production and therefore it is necessary to understand and to optimize the performance of these reservoirs. The obvious decline of the natural gas reserves associated with relatively reduced volume of the new reserves discoveries, reclaim the implementation of a new technical-economical approach of the mature gas field. The final target is in fact, the extending the life of the reservoirs, in terms of increasing the ultimate recovery factor. One of the Romgaz concepts regarding this problem is to develop compression capacities close to the wells. Many gas wells can be subjected to increased production by reducing the wellhead pressure. By installing a compressor at the wellhead or in the field, the wellhead pressure can be reduced to increase the gas production and the ultimate recovery factor. These types of compressors are characterized by low to medium throughputs with low to medium compression ratios. The implementation of this method is imposed by production behavior of the semi-depleted Romgaz fields. The biggest advantages of this type of compression are represented by the installation low costs, a low maintenance, as well as a big flexibility at the working parameters' variation.

PL

Sczerpane złoża stanowią ponad 50% światowej produkcji gazu ziemnego, dlatego też konieczne staje się zrozumienie i optymalne wykorzystanie tych złóż. Konsekwentny spadek zasobów gazu ziemnego związany ze zmniejszającą się objętością odkrywanych złóż wymusza zastosowanie nowych podejść technologiczno-ekonomicznych. Ostatecznym celem badań jest wydłużenie żywotności złóż a tym samym podniesienie wartości jego wskaźnika wydobycia. Jednym z rozwiązań reprezentowanych przez Romgaz jest rozwinięcie zdolności kompresyjnych w otoczeniu otworu. W wielu otworach gazowych produkcję można zwiększyć przez obniżenie ciśnienia głowicowego. Po zainstalowaniu kompresora na głowicy lub na złożu, wartość ciśnienia może zmaleć zwiększając tym samym produkcję gazu ziemnego. Tego typu kompresory charakteryzują się średnią przepustowością i średnią bądź niską wartością współczynnika ściśliwości. Zastosowanie wymienionej metody zostało opracowane w wyniku obserwacji zachowania na wpół sczerpanych złóż gazowych Romgaz. Największą zaletą tego typu kompresji jest niski koszt instalacji, utrzymania jak i możliwość dostosowania do bardzo zmiennych parametrów roboczych.

3

Underbalanced interventions in gas wells belonging to mature fields

80%

Tataru A. , Balazs S. , Foidas I.

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tom Vol. 34, no. 2

553--567

EN

The exploitation of natural gas fields from Transylvanian Basin started a century ago. The majority of these fields were discovered and developed in the last century, from the 1920s through the 1980s. So, these reservoirs have almost 100 years of production historical. Even if at their discovery, the initial reservoir pressures were relative high (around 100-150 bar), nowadays these mature gas fields have a very low reservoir pressure. For some of these reservoirs the pressure is 10-20 of initial values. With the rehabilitation projects ongoing, and where the challenge is to maintain or even better to increase by just a little the base production, the greatest challenge is to make certain interventions in depleted reservoirs wells. At the beginning it was not a problem to do workover for these wells because the completion fluids were lost in the reservoir and the reservoir pressures helped the wells to clean up. Now, because of the low reservoir pressures, after the interventions it would take a long time for the wells to be cleaned, or in the worst cases the wells could be abandoned. From time to time, some net pays have to be bypassed because the fluid can be lost in the reservoir. So the best method is to do workovers jobs in these wells underbalance or even with live well, and interventions using snnubing unit or the coiled tubing unit. This paper presents some of the technologies used by Romgaz to accomplish this goal and also some case studies from different types of interventions in these gas wells.