Cement slurry kev ua tau zoo plays lub luag haujlwm txiav txim siab hauv kev ua tiav ntawm cov roj zoo cementing kev ua haujlwm.
Kev tswj tsis tau dej yog dab tsi?
Nws yog hais txog lub peev xwm los tswj thiab txwv tsis pub dej los ntawm cov cement slurry rau hauv kev tsim thaum lub sij hawm cementing, tiv thaiv cov dej ntau dhau uas tuaj yeem ua rau kom slurry ntom, txo cov twj tso kua mis, thiab thaum kawg ua rau cementing tsis ua hauj lwm.
1. Dab tsi yog kev tswj cov kua dej hauv cementing?
Kev tswj cov dej tsis zoo hauv cementing yog hais txog cov txheej txheem ntawm kev tswj thiab txo cov dej los ntawm cov cement slurry mus rau hauv ib puag ncig tsim thaum lub sijhawm ua haujlwm cementing.
Nyob rau hauv permeable formations, dej dawb tuaj yeem yooj yim txav los ntawm slurry mus rau hauv kev tsim, ua rau muaj kev hloov hauv slurry zog. Kev tswj xyuas cov dej tsis zoo pab cov cement slurry tswj cov dej ruaj khov - mus rau - cement ratio, ntom, thiab rheology thoob plaws hauv kev siv thiab tso.
Yog li ntawd, lub twj tso kua mis yog khaws cia, kev pheej hmoo ntawm slurry lub cev qhuav dej yog txo, thiab cementing tsis ua hauj lwm yuav zam tau. Tsis tas li ntawd, kev tswj xyuas cov dej kom raug txo qis kom pom kev ntxeem tau thiab pab tiv thaiv kev tsim kev ncaj ncees.
2. Vim li cas cov kua dej tsis tau ntxiv rau hauv kev ua haujlwm cementing?
Cov kua dej poob additivesNws yog ib qho tseem ceeb los xyuas kom meej qhov ruaj khov thiab kev ntseeg siab ntawm cov cement slurries thaum lub sij hawm ua haujlwm cementing.
Ib txoj haujlwm cement ua tiav yuav tsum tau slurry kom nyob twj ywm homogeneous thiab pumpable los ntawm qhov sib xyaw nto mus rau qhov kawg tso downhole. Yog tias tsis muaj kev tswj xyuas cov kua dej txaus, kev poob dej ntau dhau tuaj yeem ua rau muaj kev sib txuam ntau ntxiv, kev coj tus cwj pwm tsis zoo, thiab lub cev qhuav dej ntxov.
Los ntawm kev txo cov filtrate poob, cov kua dej poob additives txhim kho cov cement qhov chaw zoo, nce qhov kev vam meej tag nrho ntawm cementing, thiab pab tiv thaiv kev tsim los ntawm cov dej ntxeem tau thiab kev puas tsuaj.
3. Dab tsi yog qhov sib txawv ntawm cov kua dej poob additives rau cementing?
Cov kua dej poob additivessiv hauv cementing feem ntau yog cais raws li lawv cov tshuaj muaj pes tsawg leeg thiab cov yam ntxwv ua haujlwm:
- Polymer-raws li kua poob additives
Dav siv vim muaj zog ua kom tsis muaj zog tswj kev ua haujlwm thiab kev siv dav dav.
- Cellulose-raws li kua poob additives
Feem ntau siv hauv qis - mus rau nruab nrab - kub cementing tshuab.
- Synthetic resin-raws li kua poob additives
Haum rau siab -kub thiab siab - salinity tej yam kev mob.
- Blended los yog hybrid kua poob additive systems
Tsim los ua kom tau raws li qhov chaw zoo los ntawm kev sib txuas ntau yam chemistry.
Txhawm rau kawm paub ntxiv cov kua dej poob ntxiv, saib ntxiv:Cov kua dej poob additives rau cementing
4. Yuav ua li cas xaiv cov dej tsis zoo ntxiv rau kev siv cementing?
Xaiv txoj caikua poob additivexav tau kev sib txuas lus ze ntawm tus neeg teb xov tooj thiab cov chaw tsim khoom.
Cov ntaub ntawv tseem ceeb yuav tsum tau muab ua ntej, suav nrog:
- Hauv qab - qhov ntsuas kub (BHCT)
- Cement slurry formulation
- Kev xav ntau npaum li cas
- Txoj kev thov (kev sib xyaw qhuav lossis kua ntxiv)
Nws tseem pom zoo kom sib txuas lus tus nqi hom phiaj, nyiam hom tshuaj ntxiv, thiab, yog tias ua tau, daim ntawv npaj cement slurry. Raws li cov ntaub ntawv no, cov chaw tsim khoom ua cov kev soj ntsuam hauv chaw soj nstuam, pom zoo cov khoom tsim nyog, thiab muab cov qauv rau cov neeg siv khoom kuaj txhawm rau txheeb xyuas qhov tsim nyog tshaj plaws.
5. Dab tsi yog qhov yuav tsum tau noj cov kua dej ntxiv hauv cov cement slurries?
Qhov ntau npaum ntawm cov kua dej poob additives feem ntau yog nruab nrab thiab yuav tsum tau ua kom zoo dua los ntawm kev kuaj sim.
Qhov ntau npaum li cas rau cov khoom siv polymer-raws li kua poob additives yog:
- Cov khoom siv hmoov: 0.6-2.5% BWOC
- Cov khoom ua kua: 2-6% BWOC
Qhov kev pom zoo yog nyob ntawm hom cement, slurry formulation, kub, thiab lwm yam additives. Kev xaiv koob tshuaj zaum kawg yuav tsum xyuas kom muaj kev tswj xyuas cov dej tsis zoo thaum tswj xyuas qhov ua tau zoo rheology thiab lub sijhawm thickening.
6. Cov cuab yeej siv li cas hauv kev sim siv los ntsuas cov kua dej poob ntxiv hauv cementing?
Kev ntsuam xyuas ntawm cov kua dej poob additives yuav tsum muaj ntau yam khoom siv hauv chav kuaj simulate downhole tej yam kev mob:
- Cement slurry tov khoom
- Consistometer
- API kua loss test cell
- HTHP kua loss test cell
- Rheometer
- Curing chamber lossis HPHT curing cell
Cov cuab yeej no yog siv los ntsuas cov dej tsis ua haujlwm, slurry rheology, thickening lub sij hawm, thiab tag nrho stability nyob rau hauv simulated zoo tej yam kev mob.
