Glavna svrha horizontalnog bušenja je izrada kanala bušotine, unutar proizvodne zone radi povećanja njene proizvodnosti ili injek-tivnosti. Pri izradi horizontalnih bušotina javljaju se ozbiljniji ...problemi, nego pri izradi vertikalnih bušotina. Ti problemi su slijedeći: loše čišćenje kanala bušotine, prekomjerna torzija i nateg, ispunjavanje kanala bušotine, gubitak cirkulacije, oštećenje stijene, nekvalitetna cemcntacija i poteškoća pri mjerenjima u kanalu bušotine. Zbog toga, uspješna izrada kanalu horizontalne bušotine i njezina proizvodnost u velikoj mjeri ovise o fluidu koji se primijenjuje tijekom bušenja i opremanja bušotine.
U radu je opisano nekoliko novih tipova fluida koji uglavnom imaju svojstva potrebna tijekom izrade horizontalnih bušotina (djelotvorno čišćenje kanala bušotine, zadržavanja krhotina u suspenziji, dobro podmazivanje i relativno malo oštećenje proizvodnih stijena).
Provider: - Institution: - Data provided by Europeana Collections- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain ...Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Pod pojmom gušenja proizvodnih bušotina, podrazumijevaju se tehnički i tehnološki postupci kojima je cilj uspostavljanje statičke hidrauličke ravnoteže u bušotini, odnosno otklanjanje pretlaka na ...ušću bušotine. Opisano je provođenje standardnog postupka gušenja usvojenog u Hrvatskoj. Prikazan je način određivanja mjesta propuštanja proizvodne opreme i utvrđivanja nivoa fluida u tubingu i prstenastom prostoru. Posebno je ukazano na važnost izbora fluida za ugušivanje s obzirom na moguće oštećivanje formacije.
"Stray" Janzen, Ryan; Mann, Steve
Proceedings of the 18th ACM international conference on Multimedia,
10/2010
Conference Proceeding
The andantephone is an instrument that allows a performed to physically step through a piece of music by walking. Each note or chord of the piece is assigned to one footstep, so expressively varying ...velocity varies the tempo in turn.
A new, more flexible design of andantephone was created for use in a new composition, using an array of tiles sensitive to geophonic seismic waves from footsteps. This user-interface was combined with a real-time frequency shifterbank which shifted the geophonic vibrations of human feet to the frequencies of the musical notes and chords of the composition. Matrix multiplication in the shifterbank allowed chords from various tiles to be expressively layered together depending on the geophonic sounds coming from any number of tiles being stepped on at a time. Moreover, the new shifterbank adjusted its tuning dynamically (according to the composition) as the performer cycled around the track, creating a responsive multitouch landscape that unraveled around the track ahead of and behind the performer. The shifterbank output was also interfaced to a pipe organ, via FLUIDI, using the organ as an additional sounding device.
A new andantephone tile configuration led to advantages over previous configurations, including less off-track radial acceleration required to change tempo, and the ability to multiplex between different types of vertex turns, which was found to improve spatial orientation when performing.
Provider: - Institution: - Data provided by Europeana Collections- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain ...Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain ...Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain ...Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain ...Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Upotreba čistača sulfida je često korištena praksa u poslovima proizvodnje i obrade u industriji nafte i plina. Posebno je zahtjevno istraživanje i razvoj novih kemijskih sastojaka prihvatljivih za ...okoliš i namijenjenih očuvanju zdravlja osoblja i učinkovitoj zaštiti materijala u raznim uvjetima. Ovaj članak uključuje ažuran pregled napora koje je industrija dosad uložila kako bi uporabom nekih kemikalija minimalizirala ili eliminirala različite probleme koje uzrokuje sumporovodik tijekom poslova bušenja na naftu i plin. Uspoređene su prednosti i mane uporabe različitih kemikalija za pročišćavanje sumporovodika iz isplake i proizvedenih fluida.
Analysing turbulence in gravel bed channels Ferro, V. (Palermo Univ. (Italy). Dipartimento di Ingegneria e Tecnologie Agroforestali); Termini, D. (Palermo Univ. (Italy). Dipartimento di Idraulica e Applicazioni Ambientali); Carollo, F.G
Rivista di Ingegneria Agraria (Italy),
(Dec 2003), Letnik:
34, Številka:
4
Journal Article
In this paper, the results of an experimental investigation on the turbulence intensity in gravel bed channels are described. The runs were carried out measuring, by an Acoustic Doppler Velocimeter, ...the turbulence intensity profile along six verticals of a given cross-section. The experimental intensity distributions showed the existence of two different regions, above and below the top of the boulders, in which different intensity profiles occur. The analysis showed that the maximum turbulence intensity decreases for increasing values of the roughness height, confirming that the turbulence damping efficiency increases when the roughness elements protrude inside the flow. The applicability of Nezu's law to the experimental intensity profiles above the roughness elements was positively tested. Finally, a new theoretical intensity distribution, applicable to the whole water depth, is proposed. The theoretical profile is characterized by two coefficients having a known physical meaning: the maximum turbulence intensity and the depth at which this maximum is located
In questo contributo sono descritti i risultati di uno studio sperimentale sull'intensita' della turbolenza in alvei in ghiaia. Le prove sono state effettuate misurando, mediante un misuratore a ultrasuoni ADV (Acoustic Doppler Velocimeter), il profilo dell'intensita' della turbolenza lungo sei verticali di una data sezione trasversale. Le distribuzioni sperimentali dell'intensita' hanno evidenziato l'esistenza di due regioni diverse, sopra e sotto la sommita' del pietrisco, in cui si riscontrano profili di intensita' diversi. L'analisi ha dimostrato che l'intensita' massima della turbolenza diminuisce all'aumentare dei valori della scabrezza assoluta, confermando che, quanto piu' gli elementi di scabrezza penetrano in seno alla corrente, tanto piu' efficace e' lo smorzamento della stessa. E' stata verificata con esito positivo l'applicabilita' della legge di Nezu ai profili sperimentali di intensita' della turbolenza al di sopra di elementi grossolani. Infine, viene proposta una nuova distribuzione teorica dell'intensita', applicabile all'intera profondita' dell'acqua. Il profilo teorico e' caratterizzato da due coefficienti che rivestono un noto significato fisico: il valore di massimo della turbolenza e la quota dove tale massimo e' localizzato
