ODABIR DLIJETA ZA BUŠENJE STIJENA S RAZLIČITIM TALOŽNIM FACIJESIMA UPORABOM METODE MARKOVLJEVA LANCA: PRIMJER STUDIJE NAFTNOGA POLJA U JUŽNOME IRANU
| Autor: | Behzad Tokhmechi, Afsaneh Ghaffari Rad, Hossein Mostafavi, Sajjad Negahban |
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| Rok vydání: | 2021 |
| Předmět: |
lcsh:TN1-997
Computer science Stochastic modelling transition matrix Well drilling Set (abstract data type) dashtak formation Formacija Dashtak optimizacija dlijeta litologija prijelazna matrica taložni facijes Drill bit lcsh:Mining engineering. Metallurgy Dashtak Formation drill bit optimization lithology sedimentary facies Water Science and Technology Markov chain lcsh:QE1-996.5 Probabilistic logic Stochastic matrix Geology Geotechnical Engineering and Engineering Geology lcsh:Geology General Energy Facies General Earth and Planetary Sciences Algorithm |
| Zdroj: | Rudarsko-geološko-naftni zbornik Volume 36 Issue 2 Rudarsko-geološko-naftni Zbornik, Vol 36, Iss 2, Pp 83-92 (2021) |
| ISSN: | 1849-0409 0353-4529 |
| DOI: | 10.17794/rgn.2021.2.8 |
| Popis: | The selection of a drill bit is an essential issue in well planning. Furthermore, identification and evaluation of sedimentary rocks before well drilling plays a crucial role in choosing the drill bit. Moreover, the Markov chain as a stochastic model is one of the powerful methods for identifying lithological units, which is based on the calculation of the transition probability matrix or transition matrix. The Markov chain experiences transitions from one state (a situation or set of values) to another according to specified probabilistic rules. In this paper, the Markov chain was implemented for bit selection in a formation with different sedimentary facies (such as the Dashtak Formation). Therefore, the proper drill bit was proposed by utilizing the transition matrix of rock facies and the available bits. This process was carried out in two wells where the thicknesses of the Dashtak Formation are 960 meters and 1410 meters. Consequently, the results indicate that the Markov chain is a practical method for selecting bits in a sequence of rock facies based on an acceptable matching between the reality mode (the used bits in the well) and the Markov chain results. Besides, in the case of using an improper bit in a well, and using a bit in a washing and reaming operation, there were differences between the used bits and the Markov chain outputs. Odabir dlijeta iznimno je važan korak u izradi projekta bušotine, a prepoznavanje i procjena taložnih stijena prije početka bušenja ima presudnu ulogu u odabiru dlijeta. Markovljev lanac, kao primjer stohastičkoga modela, jedna je od važnijih metoda za razlikovanje litoloških jedinica. Temelji se na računu matrice vjerojatnosti prijelaza ili matrice prijelaza. Markovljev lanac opisuje prijelaze iz jednoga stanja (situacije ili skupa vrijednosti) u drugo prema određenim vjerojatnosnim pravilima. U ovome je radu prvi put opisana uporaba Markovljeva lanca kod odabira dlijeta za bušenje kroz interval s različitim taložnim facijesima (formacija Dashtak). Stoga su u odabiru odgovarajućega dlijeta korišteni prijelazna matrica stijenskih facijesa i podatci o dostupnim dlijetima. Ovaj postupak proveden je u dvjema bušotinama gdje su debljine formacije Dashtak 960 i 1410 m. Dobiveni rezultati pokazuju da je Markovovljev lanac praktična metoda za odabir dlijeta kod bušenja niza litofacijesa. Zaključak je donesen na temelju stupnja podudaranja između stvarnih podataka (dlijeta korištenih u bušotini) i rezultata dobivenih modelom (Markovljevim lancem). Također, u slučaju uporabe neodgovarajućega dlijeta u bušotini za operacije pročišćavanja i proširenja kanala bušotine pojavile su se razlike između korištenih dlijeta i rezultata dobivenih Markovljevim lancem. |
| Databáze: | OpenAIRE |
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