Isingeniso Esijwayelekile:

I-ODEX (ifushane ethi “Overburden Drilling Excentric”) ibizwa nangokuthi i-Stratex, i-Tubex noma i-ODS. Kuwukushintshwa kwesando se-DTH sokujikeleza komoya. Ine-eccentric bit e-swing-out ukuze ubuyisele phansi ikesi. Futhi i-percussion bit iqukethe izingxenye ezimbili zamathiphu agxilile: i-pilot bit egxile, futhi ngemuva kwayo kukhona i-eccentric reamer bit eshwibeka ukuze ikhulise ububanzi be-borehole ngesikhathi sokumba. Ngemuva kwe-eccentric bit iyithuluzi lomhlahlandlela elifaka isicathulo se-casing sangaphakathi esikhethekile esingaphansi kwe-ODEX casing. Ngakho-ke i-ODEX idonswa phansi ngentambo yokubhoboza njengoba imbobo ithuthukile. Ukusikwa kuqhuma ngegebe le-annulus phakathi kwensiza yomhlahlandlela kanye nesicathulo se-casing kuya ku-swivel eziqondisa phansi noma kumqoqi wesampula.

Amasistimu e-ODEX ayizixazululo ezonga kakhulu zokumba i-casing ezimweni ezimaphakathi zomhlabathi. Zithandwa kakhulu ngosonkontileka abamba ukumboza emithonjeni yamanzi, imithombo ye-geothermal, imbobo yokwakhiwa kwesakhiwo esincane, iphrojekthi yedamu kanye nechweba, kanye nomsebenzi wokuhlanganisa okuncane okungajulile. Ngenxa yophiko oluhlakaniphile lokuvuselela kabusha, i-bit iyatholakala futhi ingasetshenziswa futhi. I-ODEX ilungele izimbobo ezimfushane ezithwala kanzima, ngenxa yezinzuzo ezivelele njengesakhiwo esilula, ukusebenza okulula, amathuluzi okumba abuyiselekayo, impilo ende yesevisi kanye nekhwalithi enhle. Izici zokumba zezinhlelo ze-ODEX ziyafana nezendlela yokumba isando ye-DTH, njenge:

Ukususwa ngokushesha kwama-cuttings;

Izinga eliphezulu lokungena, ikakhulukazi ekubunjweni kwamadwala aqinile (isb., i-basalt);

Inhlabathi elula kanye nesampula yamanzi angaphansi komhlaba ngesikhathi sokumba;

Kungenzeka ukukala isilinganiso sesivuno ekujuleni okukhethiwe ekubunjweni;

Kuwusizo ekubunjweni okungahlanganisiwe okunobungozi obukhulu bokugoba (lesi cishe isici esibaluleke kakhulu).

I-PLATO inezinhlobo ze-ODEX ezisuka ku-ODEX90 kuye ku-ODEX280, ezikhiqizwa ngamashange amaningi ezando ezikhona ze-DTH ezinosayizi osuka ku-3” kuya ku-10”. Zonke zihlanganisa idivayisi yomhlahlandlela, i-Casing Shoe, i-Eccentric Reamer, i-Pilot Bit, i-Guide Sleeve, namakhithi okukhiya.