Gabaɗaya Gabatarwa:

ODEX (gajere don "Over Burden Drilling Excentric") kuma ana kiransa Stratex, Tubex ko ODS. Daidaitawar guduma ce ta zagayowar iska ta DTH. Yana tare da ɗan jujjuyawar juzu'i don sake kunna ƙasan casing. Kuma bitar bugun ya ƙunshi ƙayyadaddun tukwici guda biyu: ɗan ƙaramin matukin jirgi mai ɗaukar hankali, kuma a bayansa akwai wani ɗan ƙaramin reamer wanda ke jujjuyawa don ƙara diamita rijiyar burtsatse yayin hakowa. Bayan eccentric bit shine na'urar jagora wanda ke haɗa takalman casing na musamman na ciki kafada akan kasan calo na ODEX. Don haka ODEX ɗin yana jan ƙasa da igiyar rawar soja yayin da rami ya ci gaba. Yanke yana busa ta tazarar annulus tsakanin na'urar jagora da sanya takalma zuwa maƙalar da ke jagorantar su a ƙasa ko zuwa ga mai karɓar samfurin.

Tsarukan ODEX sune mafita na tattalin arziƙi don hakowa a matsakaicin yanayin ƙasa. Suna da farin jini sosai tare da ƴan kwangilar hakar ma'adanai don yin kwantiragi a cikin rijiyoyin ruwa, rijiyoyin ƙasa, matsakaicin ƙaramin rami na gini, aikin madatsar ruwa da tashar jiragen ruwa, da aikin ƙarami mai zurfi. Saboda ƙwararren reaming reaming, bit ɗin yana iya dawo da shi kuma ana iya sake amfani da shi. ODEX yana da kyau don gajerun ramuka a cikin nauyin nauyi mai kama da juna, godiya ga fa'idodi masu kyau kamar tsari mai sauƙi, aiki mai sauƙi, kayan aikin hakowa, tsawon sabis da inganci mai kyau. Siffofin hakowa na tsarin ODEX daidai suke da na hanyar hako guduma na DTH, kamar:

Saurin kawar da yankan;

Yawan shiga ciki, musamman a cikin samuwar dutse mai juriya (misali basalt);

Sauƙaƙan ƙasa da samfurin ruwa na ƙasa yayin hakowa;

Yiwuwar auna ƙimar ƙima a zurfin da aka zaɓa a cikin samuwar;

Mai fa'ida a cikin abubuwan da ba a haɗa su ba tare da babban haɗarin kogo (wannan tabbas shine mafi mahimmancin fasalin).

PLATO yana da nau'ikan ODEX masu kama daga ODEX90 zuwa ODEX280, waɗanda aka samar tare da ɓangarorin mafi yawan hammata na DTH masu girma daga 3” zuwa 10”. Dukkansu sun ƙunshi Na'urar Jagora, Takalmi Casing, Reamer Eccentric, Pilot Bit, Hannun Jagora, da Kayan Kulle.