Thaum lub sijhawm ua haujlwm drilling, cov phab ntsa casing tau txhaws nrog av nkos, cement, xeb, nplai tsim, thiab lwm yam kev cuam tshuam uas tuaj yeem cuam tshuam kev ua haujlwm ntawm cov cuab yeej downhole. Lub casing scraper tshem tawm cov deposits xws li burrs thiab irregularities nyob rau hauv lub casing ID.
Rau lub neej ntawm lub qhov dej, cov khib nyiab yog qhov teeb meem rov tshwm sim thiab thaj tsam ntawm cov dej khib nyiab mus rau cov khoom tawg. Kev khiav hauj lwm cov cuab yeej downhole hauv lub casing uas tsis tau ntxuav tuaj yeem ua rau cov khoom ua tiav, ua rau cov khoom poob, thiab kev puas tsuaj.
Casing scrapers tuaj yeem:
- Tshem cov paraffin, av nkos, thiab hardened cement
- Tshem tawm burrs thiab nicks tshwm sim los ntawm cov cuab yeej nuv ntses thiab cov khoom siv tho
- Saib xyuas cov hniav uas tshwm sim los ntawm kev siv cov cuab yeej tsis raug
- Tshem tawm burrs los ntawm perforations
- Tshem cov mos txwv nyob rau hauv lub casing
Feem ntau, casing scrapers muaj xws li ib tug scraper lub cev, ib tug hniav retainer, scraper hniav nrog springs thiab retainer rings. Lub cev ntawm scraper yog splined thiab xauv cov hniav rau hauv lub cev kom muaj kev nyab xeeb. Cov hniav yog ua los ntawm cov hlau zoo rau durability thiab zoo scraping. Cov hniav tuaj yeem npog thaj tsam ntawm 360 degree thiab tau tsim nrog lub taper ntev kom hla tau yooj yim los ntawm kev sib txuas casing.
Cov pob zeb hauv cov hniav khaws cov hniav kom ruaj khov rau ntawm cov yeeb nkab thiab tso cai rau nws kom compress thiab ntxhov siab thaum lub sijhawm ua haujlwm. Cov hniav retainer thiab retainer rings tuav cov hniav thiab springs nyob rau hauv qhov chaw ntawm lub cev ntawm scraper. Lub scraper yog khiav mus rau hauv lub casing los yog tubing los ntawm kev sib hloov los yog spudding.
