Kunshin cirewa na gaggawa

Wani kayan aiki ne da ake amfani da shi wajen haƙa da kuma gyara rijiyoyin mai da iskar gas masu zurfi na teku, ta hanyar Mobile Offshore Drilling Rigs (MODU's) da Rijiyoyin Rijiyoyi (WIV's). An tsara EDP ne don amfani a lokacin gaggawa, lokacin da MODU ko WIV ke buƙatar cirewa da sauri, da kuma nisantar rijiyar mai/gas da take haƙawa ko take aiki a kanta.  Misalan lokacin da wannan zai iya zama dole sun haɗa da yanayi mai tsanani da ba a zata ba wanda ya wuce ƙarfin MODU/Jirgin ruwa na riƙe matsayinsa. 

A ƙarƙashin yanayin aiki na yau da kullun, ana haɗa MODU/WIV (wanda ke iyo a saman teku) da rijiyar mai/iskar gas (wanda aka haƙa a cikin gadon teku) ta hanyar bututun ƙarfe a tsaye (ko kusa da tsaye), wanda ake kira riser na ruwa . Ana motsa kayan aiki da ruwa a cikin riser na ruwa kamar yadda ake buƙata zuwa/daga rijiyar. A ƙasan riser na ruwa, EDP da sauran abubuwan da ke haɗa riser zuwa rijiyar kuma suna barin rijiyar ta rufe idan an buƙata, sun ƙunshi ' Lower Riser Package ' (LRP). 

Idan aka buƙaci yin hakan, EDP tana katsewa daga LRP kuma tana ware mai riser daga muhalli. Don haka EDP tana bawa MODU/WIV damar katsewa cikin aminci da sauri daga rijiyar ƙarƙashin teku da kuma ƙaura cikin gaggawa. An tsara EDP don gudanar da aikinsa yayin da yake cikin kaya tare da kusurwar katsewa mai yawa.

EDP ya ƙunshi mahaɗi zuwa sauran LRP, bawul ɗin keɓewa, mai tarawa, tsarin sarrafa ƙarƙashin teku da wurin haɗi a saman don haɗawa da bututun riser. Bawul ɗin riƙewa na samarwa yana rufewa a cikin riser kuma bawul ɗin babban annulus yana rufewa a cikin riser. Bawul ɗin crossover yana ba da damar zagayawa na riser bayan katsewa. <refs. IADC Drilling Lexicon / API RP 17G, Shawarar Aiki don Kammalawa/Aiki Risers / API RP 96, Tsarin Rijiyar Ruwa Mai Zurfi da Ginawa / Injiniyan GSO>

 Hanyoyin haɗi na waje 



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