I-Case Kelly drilling

Ukumbiwa kwe-cased kelly kuyindlela ekhethekile yokumbiwa kwezinto ezinzima ezibophayo esetshenziswa kumathafa amakhulu lapho ukuzinza nokunemba kubalulekile empumelelweni yephrojekthi. Le ndlela isebenzisa i-kelly bar—ithuluzi eliqinile lokumbiwa elithumela amandla okuzungezisa nokuthumela—ihlanganiswe nokhuni lwensimbi olungaphandle ukuze kugcinwe ubuqotho bebholo le-boreku, ngokusebenzisa umhlaba ongenazithiyo noma ophukile kakhulu. I-casing ibamba njengohlelo lokusekela oluvimbela ukuwa kwe-borehole, ilawule ukungena kwamanzi emhlabeni, futhi ivumele ukuqhubeka kokumbiwa ezimweni ezinzima ze-geotechnical. I-kelly bar isebenza ngokuhlanganyela ne-casing ukuze kudalwe inqubo yokumba ephethwe, okwenza le ndlela kube ne-effektiv ezokuhlola i-geology engaphansi nokwakha izisekelo ezimweni zomhlaba ezinzima. Ukuhleleka kwezinsiza zokumbiwa kwe-cased kelly ngokuvamile kuhlanganisa i-drilling rig enekhono elikhulu equkethe uhlelo lwe-kelly drive, isethi ye-kelly bar, kanye nohlelo lwe-casing oluphonyolayo. Ukusakazwa komkhiqizo wokumbiwa—noma amanzi, uthuli, noma i-bentonite slurry—kukhulula udoti ku-borehole ngenkathi kuqiniswe imifanti ngesikhathi sokumba. I-casing yangaphandle ingasondelwa kancane kancane njengoba ukumbiwa kuqhubeka, noma igcinwe ezindaweni ezithile kuye ngezidingo ze-geotechnical nezincazelo zokwakha. Le ndlela ephindwe kabili ivumela abakhiqizi ukuphatha amazinga wamanzi emhlabeni, ukuvimbela ukuwa, nokugcina ubude be-borehole ngesikhathi lapho ezinye izindlela zokumbiwa zingase zibe nomphumela omubi. Abakhi baphendukela ekujoleni izimo zokumba ngesikhathi sangempela ngokususelwa ezimweni zomhlaba ezithandwa, okwenza le ndlela ihlale iyaphenduka phakathi kwezidingo zephrojekthi ezahlukene nezithiyo zezindawo. Ukumbiwa kwe-cased kelly kusebenza kahle kakhulu ezimweni zomhlaba eziyahlukene ezihlanganisa i-clays ethambile ne-silts kuya emhlabeni ophilayo onezinto eziqondile neziqu ukubeka. Kubalulekile ezitshalweni eziphukile, izakhiwo ezimanzi kakhulu, nasezindaweni lapho amazinga wamanzi emhlabeni azodinga ukuqondiswa kwe-borehole. Izicelo ekwakheni izisekelo ezinzima zifaka ukuhlola indawo yokwakhiwa kwe-pile yokwakha ethafeni, ukumbiwa kwe-caisson foundation, kanye nokuhlola ukucindezelwa komhlaba. Ngokuphathelene nezobunjiniyela bezisekelo, abanjiniyela bethemba idatha eqoqwe ngecased kelly drilling ukuze baphendule izinga le-pile tip, basungule imingcele yokuthwala, futhi bathole izingqimba zomhlaba ezifanele ukuhlinzekwa kokugcina noma ukuhweba. Le ndlela iphinde isekele amaphrojekthi okuthuthukiswa komhlaba, ukumbiwa kokubuyiselwa kwemvelo, nokuhlola izakhiwo lapho ulwazi oluphansi luthinta ngqo izinqumo zokwakha nezindlela zokwakha. Kwabakhiqizi bezimakethe nabahlinzeki bezinsiza, ukumbiwa kwe-cased kelly kumelwe ukuba yisigaba esihlukile emakethe phakathi kwezinsizakalo zokwakha eziyinkimbinkimbi nezobunjiniyela. Abakhi abaqeqeshiwe behlenga le mkhiqizo basebenzisa lokhu ukuze babhekane neziphakamiso ezinhle ezidinga ukunemba kwezinqubo nezokukwazi. I-essence ecindezelayo yezinsiza zokumba kwempilo—kubandakanya ama-drilling rigs aqinile, izisetshenziswa ze-kelly bar, ama-casing systems, kanye nokuphatha umkhiqizo wokumbiwa—idalela isidingo esiqhubekayo sezinsiza ezisezingeni eliphezulu, izithako ezikh replacements, kanye neziqu zomsebenzi. Abanikazi bephrojekthi abafuna ukuhlolwa okuthembekile kwangaphansi kanye nezinsizakalo zokwakhiwa kwezisekelo bathembele kubakhiqizi abanolwazi abane-system ye-cased kelly drilling eyaziswa ukuze bahlinzeke ngedatha ye-geotechnical enembile nokufakwa kwezakhiwo okuhle ezimweni ezinzima kulo lonke iphrojekthi yabo.