Amabhakede E-Roller-Cone

Ama-roller-cone core barrel iyithuluzi elikhethekile lokubhoboza eliqondiswe ukukhipha amasampula adlula amathafa enhloko yamatshe emithonjeni yokwakha, ikakhulukazi ukuhlola amatshe angaphansi kanye nokuhlonzwa kwezakhiwo zomhlaba ezindaweni ezijula. Lezi zinsiza ziqukethe ithangi elijikayo elinotub tubular yangaphakathi kanye nekhanda elijikelezayo elihlanganiswe nezinsimbi ezisetshenziswa njenge-roller-cone bits—ngokuvamile kube nezimbobo ezintathu ezihambayo ezinelanga eliqinile le-carbon steel noma i-tungsten carbide, ezibandakanya i-tungsten noma ama-diamond inserts. Ithangi le-core lenza umkhankaso omkhulu phakathi kwe-drilling string kanye nekhanda lokuwahlula, kuvumela ukuthi impahla yamatshali ekhishwe ibanjwe futhi ibuyiswe intact ukuze kuhlolwe kwezomhlaba nasezobuchwepheshe. Ama-roller-cone core barrels asetshenziswa ezindleleni ezahlukene zokwakha amatheku ajula: ekwakhiweni kwemilingo yokubamba, lapho ukunqunywa kwedwala elijulile nokuhlola izinga kwenza kube nomsebenzi wokuqinisa umlandeli kanye nekhono lokushaywa kwama-pile; emkhakheni wama-pile secant kanye ne-tangent, ukuqinisa ubukhulu bokuthola izindlela zobuchwepheshe; ezindwangu zokukhipha nezinhlaka zokulawula ukugeleza, ukuhlola ukungena kanye nezindawo zokuthola izinsiza ezibhalwe ezindaweni zokubhaliswa; nasekuqaliseni kokuhlola indawo ngaphambi kokungena komsebenzi omkhulu wokumba noma wokwakha. Umsebenzi wabo omkhulu ukuhlinzeka ngokuqinisekisa kwe-core control enobuchwepheshe be-Rock Quality Designation (RQD), ukuhlolwa kokuqinisa okungazungezisi, kanye nokuchaza okwakhiwe okudingekayo ukuze kuqinisekiswe ukudweba nokuhlola izinga lokwakha. Umqondo wokusebenza usekelwe kuchungechunge olujikayo olusetshenziswe kwi-drilling string, okwenza ama-roller cones ajikeleze umkhomba we-core barrel ngenkathi ehamba endlini ye-dala. Umsebenzi webhizinisi uwumakhenikha kanye nokuphuca—amathanga aphethe amakhanda ama-cone akha kahle avula impahla yamatshali ngaphansi kwegilasi ye-roller-cone, kuvumela ukuthi impahla ephukile iwelinele ngaphakathi kothi lwe-core tube. Njengoba ukufaka isixho kuhamba phambili, ingxenye ye-barrel ihamba ihlangana neziki-ziki zamatshe, iphakanyiswe umqhamuku oqinile (uhlobo lwebhola noma ibhakede) olukhululiwe ekugcineni kwethanga. Uma ubude be-core obufunwa bufinyelela (ngokuvamile 3-10 amamitha ngamunye), konke kuvela futhi i-core ithathwa ngokuqaphela, iyalinganiswa, ibhalwe, futhi ilungiselelwe ukuhlolwa kwamalabhorethri ngokwesikhumbuzo se-ISRM (International Society for Rock Mechanics). Izifiso zokuhlola zifaka phakathi izinhlelo ezijwayelekile zocingo (NQ, HQ, PQ ezilinganiselwa ku-47.6, 63.5, kanye no-85 mm ngaphansi kokuqondiswa okukhwabanayo) kanye ne-barrels ezibambekile ngamagagasi. Izinhlelo ze-roller-cone bits zihluka ngokufaneleka kwamatheku: imihlahlandlela elula isebenzisa ama-carbide-tipped inserts anezikhala ezinkulu, kanti ama-dura noma ama-abrasive rock kudinga ama-button bits e-tungsten carbide anedensity engxenyeni eyodwa. Ama-barrels anobude obude bezitsha ezinzima, ama-split-tube barrels ukuze kugcinwe kahle amasampula, kanye nezinhlelo ezikhethekile ezihambisana ne-structural geology ziqoqa ugqozi. Ukukhetha izinhlelo zamahhala ze-roller-cone core barrel kuncike ekulindelweni kokuhamba kwamatheku (UCS range), izidingo zokuphakanyiswa kwe-core ezibhalwe embikweni wokuhlola kwezobuchwepheshe, imikhawulo ye-drilling budget, kanye nokuhambisana nemiphumela ye-rig. Ababheki kufanele balinganisela izinga lokwakha elikhethwe ngokuphambukisayo—ukungena okudlulele kukhuphula ukungena kodwa kungenza ukunyakaza kwe-core sample nokunciphisa; ubuchwepheshe obunobungozi bunciphisa ukuphuka kodwa bukhulisa isikhathi somsebenzi. Izindinganiso ezizokwenziwa zifaka phakathi ISO 13311-1 (ukuhlinzekwa kwe-core kanye nesistimu yeziyalezo zamatshe), DIN 4095 (i-Standard yaseJalimane yokubhoboza nokukhipha), kanye nezikhombisi-ndlela ze-API (American Petroleum Institute) ezihambisana nezicelo zokwakha. Ukuhlolwa kwe-RQD kuqhubekela phambili ngezincazelo ze-ISRM, futhi ukuthwebula ukusakaza kwe-core box kuqoshwa ngokuqondile ngokwemigomo ye-ISO 14689.