Cov tshuaj ntxiv rau cement yog dab tsi thiab daim ntawv thov yog dab tsi?

Cov cement txhawb nqa thiab tiv thaiv cov qhov dej casings thiab pab ua kom tiav kev sib cais zonal. Qhov tseem ceeb rau kev nyab xeeb dua, ib puag ncig zoo, thiab muaj txiaj ntsig zoo, kev sib cais zonal yog tsim thiab tswj hwm hauv lub qhov dej los ntawm cov txheej txheem cementing. Kev sib cais zonal tiv thaiv cov kua xws li dej lossis roj hauv ib cheeb tsam los ntawm kev sib tov nrog roj hauv lwm cheeb tsam. Qhov no yog ua tiav los ntawm kev tsim cov hydraulic barrier ntawm casing, cement thiab formation. Cov cement additives yog cov ntaub ntawv ntxiv rau cement rau kev ua kom zoo dua ntawm cov khoom cement thiab cov txheej txheem sib tsoo cement. Cov cement additives raug faib ua pawg khoom sib txawv xws li cov khoom pab sib tsoo, cov khoom txhim kho lub zog thiab cov khoom txhim kho kev ua tau zoo. Muaj ob hom kev ua ub no yooj yim hauv cementing, uas yog, thawj zaug cementing thiab thib ob. Primary cementing kho cov hlau casing rau cov formation ib puag ncig. Secondary cementing yog siv rau kev sau cov formations, sealing, lossis dej kaw. Kev ua tau zoo tuaj yeem hloov pauv los ntawm kev ntxiv cov additives txog ntau yam. Nyob ntawm seb daim ntawv thov ntawm cement, ntau yam additives tuaj yeem suav nrog. Cov no suav nrog accelerators, retarders, dispersants, extenders, weighting agents, gels, foamers, thiab fluid loss additives. Foring Chemcials muaj ntau yam tshuaj lom neeg tshwj xeeb zoo rau kev siv roj av thiab tseem muab kev tsim qauv tshwj xeeb los txhawb thiab txhim kho cov txheej txheem cementing. Cov tshuaj cement dispersants txhim kho cov slurry rheology xws li kev nqus dej ntev tau zoo dua thiab tib lub sijhawm cov dej-txo cov cement slurries ua tau. Cov kua poob additives, uas ruaj khov tiv thaiv qhov kub siab thiab cov ntsev concentrated daws, ua kom ntseeg tau tias muaj kev ua haujlwm cementing txhim khu kev qha hauv qab cov xwm txheej nyuaj. Retarders tuaj yeem ua ke nrog peb cov dispersants ua haujlwm zoo heev uas tso cai rau lub sijhawm tseem ceeb cementing hauv qab cov xwm txheej kub siab. Cov tshuaj tiv thaiv roj migration additives tiv thaiv cov roj los ntawm channeling los ntawm cov cement hardening thiab ua kom ntseeg tau tias muaj kev ua haujlwm cementing txhim khu kev qha, thaum peb cov defoamers muaj cov khoom tswj kev ua npuas ncauj zoo heev.