PDC hloov pauv

Blees paub

Polycrystalline pob zeb diamond compacts (PDC) tau siv rau hauv cov ntawv thov kev lag luam, suav nrog cov ntawv thov pob zeb drilling thiab cov ntawv thov hlau machining. Cov compacts zoo li no tau ua kom pom qhov zoo dua qee yam ntawm lwm yam kev txiav, xws li kev hnav zoo dua thiab kev cuam tshuam. Lub PDC tuaj yeem tsim los ntawm sintering ib tus neeg pob zeb diamond hais ua ke nyob rau hauv lub siab thiab kub siab (HPHT) tej yam kev mob, nyob rau hauv lub xub ntiag ntawm ib tug catalyst / hnyav uas txhawb cov pob zeb diamond-pob zeb diamond bonding. Qee qhov piv txwv ntawm catalyst/solvents rau sintered pob zeb diamond compacts yog cobalt, npib tsib xee, hlau, thiab lwm yam Group VIII hlau. PDCs feem ntau muaj cov ntsiab lus pob zeb diamond ntau dua xya caum feem pua ​​​​ntawm qhov ntim, nrog txog yim caum feem pua ​​​​rau txog cuaj caum-yim feem pua ​​​​yog qhov raug. PDC yog sib koom ua ke rau hauv lub substrate, yog li tsim PDC cutter, uas feem ntau yog ntxig rau hauv, los yog mounted rau, ib tug downhole cuab tam xws li ib tug laum me ntsis los yog ib tug reamer.

PDC hloov pauv

PDC cutters yog tsim los ntawm tungsten carbide substrate thiab pob zeb diamond hmoov nyob rau hauv qhov kub thiab txias. Cobalt yog ib tug binder. Leaching txheej txheem tshuaj tshem tawm cov cobalt catalyst uas suav nrog cov qauv polycrystalline. Qhov tshwm sim yog lub rooj pob zeb diamond nrog txhim kho kev tiv thaiv thermal degradation thiab abrasive hnav, uas ua rau lub neej ntev dua cutter.. Cov txheej txheem no feem ntau ua tiav hauv ntau tshaj 10 teev hauv qab 500 txog 600 degree los ntawm lub tshuab nqus tsev vacuum. Lub hom phiaj ntawm leached yog txhawm rau txhim kho qhov nyuaj ntawm PDC. Feem ntau tsuas yog cov roj av PDC siv cov thev naus laus zis no, vim tias qhov chaw ua haujlwm ntawm cov roj teb yog qhov nyuaj dua.

Luv luvKeeb kwm

Xyoo 1980s, ob lub tuam txhab GE (USA) thiab Sumitomo Company (Nyiv) tau kawm txog kev tshem tawm cobalt los ntawm kev ua haujlwm ntawm PDC cov hniav txhawm rau txhim kho kev ua haujlwm ntawm cov hniav. Tab sis lawv tsis tau ua tiav kev lag luam. Tom qab ntawd ib lub tshuab tau rov tsim dua thiab patented los ntawm Hycalog（Teb chaws USA）. Nws tau ua pov thawj tias yog tias cov khoom siv hlau tuaj yeem raug tshem tawm ntawm qhov sib txawv ntawm cov nplej, qhov thermal stability ntawm PDC cov hniav yuav zoo dua kom cov me ntsis tuaj yeem xyaum zoo dua hauv cov txheej txheem nyuaj thiab ntau dua. Lub tshuab tshem tawm cobalt no txhim kho qhov hnav tsis kam ntawm PDC cov hniav hauv cov pob zeb tawv tawv heev thiab ua kom dav ntxiv rau cov ntawv thov ntawm PDC cov khoom.