Hydroxyethyl cellulose (HEC) yog ib qho tseem ceeb ntawm cov dej-soluble polymer uas ua lub luag haujlwm tseem ceeb hauv cov roj drilling. Raws li cov cellulose derivative nrog cov khoom tshwj xeeb ntawm lub cev thiab tshuaj lom neeg, HEC tau siv dav hauv cov roj av drilling thiab roj ntau lawm.
1. Cov khoom tseem ceeb ntawm hydroxyethyl cellulose (HEC)
Hydroxyethyl cellulose (HEC) yog ib qho tsis-ionic dej-soluble polymer compound tau los ntawm tshuaj hloov kho ntawm ntuj cellulose. Los ntawm kev qhia cov pab pawg hydroxyethyl rau hauv cov qauv molecular ntawm cellulose, HEC muaj zog hydrophilicity, yog li nws tuaj yeem yaj hauv dej los tsim cov tshuaj colloidal nrog qee qhov viscosity. HEC muaj cov qauv molecular ruaj khov, muaj zog tiv thaiv tshav kub, tsis muaj tshuaj lom neeg, thiab tsis muaj tshuaj lom, tsis muaj ntxhiab, thiab muaj biocompatibility zoo. Cov yam ntxwv no ua rau HEC zoo tagnrho cov tshuaj ntxiv hauv cov roj drilling.
2. Mechanism ntawm HEC hauv cov roj drilling
2.1 Regulating drilling kua viscosity
Thaum lub sij hawm cov roj drilling, cov kua dej drilling (tseem hu ua cov av nkos) yog cov kua dej ua haujlwm tseem ceeb, feem ntau yog siv los ua kom txias thiab lubricate lub laum me ntsis, nqa cov txiav, txhim kho phab ntsa zoo, thiab tiv thaiv kev tawg. HEC, raws li lub thickener thiab rheology hloov kho, tuaj yeem txhim kho nws cov txiaj ntsig ua haujlwm los ntawm kev kho cov viscosity thiab rheological zog ntawm cov kua dej drilling. Tom qab HEC dissolves nyob rau hauv lub drilling kua, nws tsim ib tug peb-dimensional network qauv, uas ho txhim kho lub viscosity ntawm cov dej drilling, yog li txhim kho cov xuab zeb nqa peev xwm ntawm lub drilling kua, xyuas kom meej tias cov cuttings yuav smoothly coj tawm ntawm lub hauv qab ntawm lub qhov dej, thiab tiv thaiv qhov dej txhaws.
2.2 Qhov zoo ntawm phab ntsa ruaj khov thiab tiv thaiv kev sib tsoo zoo
Zoo phab ntsa stability yog ib qho teeb meem tseem ceeb heev hauv drilling engineering. Vim lub complexity ntawm lub underground stratum qauv thiab lub siab sib txawv generated thaum lub sij hawm drilling, lub qhov dej phab ntsa yog feem ntau nws ntog los yog instability. Kev siv HEC hauv cov kua dej drilling tuaj yeem txhim kho cov tshuaj mud tsis muaj zog ntawm cov micro nrum ntawm phab ntsa, thiab tiv thaiv cov zoo phab ntsa los ua tsis ruaj khov. Cov nyhuv no yog qhov tseem ceeb heev rau kev tswj xyuas qhov kev ncaj ncees ntawm cov phab ntsa zoo thiab tiv thaiv kom tsis txhob muaj kev sib tsoo zoo, tshwj xeeb tshaj yog nyob rau hauv cov formations uas muaj zog permeability.
2.3 Tsawg zog theem system thiab ib puag ncig zoo
Ib tug loj npaum li cas ntawm cov khoom hais feem ntau yog ntxiv rau cov tsoos drilling kua system los txhim kho lub viscosity thiab stability ntawm lub drilling kua. Txawm li cas los xij, cov khoom siv zoo li no tuaj yeem hnav ntawm cov khoom siv drilling thiab tuaj yeem ua rau muaj kuab paug nyob hauv cov roj av tom ntej. Raws li cov thickener ua tau zoo, HEC tuaj yeem tswj tau qhov zoo tshaj plaws viscosity thiab rheological zog ntawm cov dej drilling nyob rau hauv cov xwm txheej ntawm cov khoom tsis muaj cov ntsiab lus, txo cov khoom siv, thiab txo kev puas tsuaj rau lub reservoir. Tsis tas li ntawd, HEC muaj biodegradability zoo thiab yuav tsis ua rau muaj kuab paug mus ntev rau ib puag ncig. Yog li ntawd, nrog rau kev tiv thaiv ib puag ncig nruj zuj zus niaj hnub no, daim ntawv thov zoo ntawm HEC tau pom tseeb dua.
3. Qhov zoo ntawm HEC hauv cov roj drilling
3.1 Cov dej zoo solubility thiab thickening nyhuv
HEC, raws li cov khoom siv dej-soluble polymer, muaj cov solubility zoo nyob rau hauv cov dej sib txawv (xws li dej tshiab, dej ntsev, thiab lwm yam). Qhov no ua rau HEC siv rau ntau qhov chaw geological complex, tshwj xeeb tshaj yog nyob rau hauv high-salinity ib puag ncig, thiab tseem muaj peev xwm tuav tau zoo thickening kev ua tau zoo. Nws cov nyhuv thickening yog qhov tseem ceeb, uas tuaj yeem txhim kho lub zog rheological ntawm cov kua dej drilling, txo qhov teeb meem ntawm kev txiav tawm, thiab txhim kho kev ua haujlwm drilling.
3.2 Zoo kub thiab ntsev tsis kam
Nyob rau hauv qhov sib sib zog nqus thiab ultra-deep zoo drilling, qhov tsim kub thiab siab yog siab, thiab cov dej drilling tau yooj yim cuam tshuam los ntawm qhov kub thiab txias siab thiab poob nws qhov kev ua haujlwm qub. HEC muaj cov qauv molecular ruaj khov thiab tuaj yeem tswj tau nws cov viscosity thiab rheological zog ntawm qhov kub thiab txias. Tsis tas li ntawd, nyob rau hauv high-salinity tsim ib puag ncig, HEC tseem tuaj yeem tuav cov nyhuv thickening zoo los tiv thaiv cov dej drilling los ntawm condensing lossis destabilizing vim ion cuam tshuam. Yog li ntawd, HEC muaj qhov kub thiab txias thiab ntsev tiv thaiv nyob rau hauv txoj kev geological tej yam kev mob thiab yog dav siv nyob rau hauv qhov tob tob thiab nyuaj drilling tej yaam num.
3.3 Kev ua haujlwm zoo lubrication
Cov teeb meem kev sib txhuam thaum lub sij hawm drilling kuj yog ib qho tseem ceeb cuam tshuam rau kev ua haujlwm drilling. Raws li ib qho ntawm cov roj nplua nyeem hauv cov dej drilling, HEC tuaj yeem txo qhov kev sib txhuam coefficient ntawm cov cuab yeej drilling thiab cov phab ntsa zoo, txo cov cuab yeej siv, thiab txuas ntxiv lub neej kev pab cuam ntawm cov cuab yeej drilling. Qhov no feature tshwj xeeb tshaj yog nyob rau hauv kab rov tav qhov dej, inclined qhov dej thiab lwm yam zoo hom, uas yuav pab txo tau qhov tshwm sim ntawm downhole tsis ua hauj lwm thiab txhim kho tag nrho cov kev khiav hauj lwm efficiency.
4. Kev siv tswv yim thiab kev ceev faj ntawm HEC
4.1 Dosing method and concentration control
Txoj kev dosing ntawm HEC ncaj qha cuam tshuam nws cov dispersion thiab dissolution nyhuv hauv cov kua dej drilling. Feem ntau, HEC yuav tsum tau maj mam ntxiv rau cov kua dej hauv qhov sib xyaw kom ntseeg tau tias nws tuaj yeem ua kom sib npaug thiab tsis txhob sib xyaw. Nyob rau tib lub sijhawm, kev siv cov concentration ntawm HEC yuav tsum tau tswj kom tsim nyog raws li cov txheej txheem tsim, drilling kua dej ua tau zoo, thiab lwm yam. Cov concentration ntau dhau yuav ua rau cov kua dej drilling kom khov thiab cuam tshuam rau fluidity; thaum qis heev ib qho concentration yuav tsis tuaj yeem ua rau nws cov thickening thiab lubrication cuam tshuam. Yog li ntawd, thaum siv HEC, nws yuav tsum tau kho kom zoo thiab kho raws li qhov tseeb.
4.2 Compatibility nrog lwm yam additives
Nyob rau hauv qhov tseeb drilling kua tshuab, ntau yam tshuaj additives feem ntau yog ntxiv kom ua tiav cov haujlwm sib txawv. Yog li ntawd, kev sib raug zoo ntawm HEC thiab lwm yam additives kuj yog ib qho tseem ceeb uas yuav tsum tau xav txog. HEC qhia tau hais tias muaj kev sib raug zoo nrog ntau yam kev siv cov kua dej ntxiv xws li cov kua dej poob qis, cov roj nplua nyeem, cov stabilizers, thiab lwm yam. Yog li ntawd, thaum tsim cov qauv, nws yog ib qho tsim nyog yuav tsum tau ua tib zoo xav txog kev sib cuam tshuam ntawm ntau yam khoom siv los xyuas kom meej qhov ruaj khov thiab sib xws ntawm cov dej ua haujlwm drilling.
4.3 Kev tiv thaiv ib puag ncig thiab kev kho dej khib nyiab
Nrog rau cov kev cai tiv thaiv ib puag ncig nruj zuj zus, kev ua phooj ywg ib puag ncig ntawm cov dej drilling tau maj mam tau txais kev saib xyuas. Raws li cov khoom siv nrog biodegradability zoo, kev siv HEC tuaj yeem txo cov pa phem ntawm cov dej drilling rau ib puag ncig. Txawm li cas los xij, tom qab drilling tiav lawm, cov dej khib nyiab uas muaj HEC tseem yuav tsum tau kho kom zoo kom tsis txhob muaj kev phom sij rau ib puag ncig. Nyob rau hauv cov txheej txheem ntawm kev kho cov dej khib nyiab, kev kho kev tshawb fawb xws li cov dej khib nyiab rov qab thiab degradation yuav tsum tau txais kev pom zoo nrog rau cov kev cai tiv thaiv ib puag ncig hauv zos thiab cov kev cai tsim nyog los xyuas kom meej tias qhov cuam tshuam ntawm ib puag ncig raug txo qis.
Hydroxyethyl cellulose (HEC) plays lub luag haujlwm tseem ceeb hauv cov roj drilling. Nrog nws cov dej solubility zoo heev, thickening, kub thiab ntsev tsis kam thiab lubrication nyhuv, nws muab ib tug txhim khu kev qha tshuaj rau kev txhim kho kev ua tau zoo ntawm drilling kua. Nyob rau hauv txoj kev geological tej yam kev mob thiab hnyav ua hauj lwm ib puag ncig, daim ntawv thov ntawm HEC tuaj yeem txhim kho kev ua haujlwm zoo, txo cov khoom siv, thiab ua kom muaj kev ruaj ntseg zoo. Nrog kev nce qib txuas ntxiv ntawm kev lag luam roj thev naus laus zis, daim ntawv thov kev cia siab ntawm HEC hauv cov roj drilling yuav dav dua.
Post lub sij hawm: Sep-20-2024