A drilling lub thawvconverts lub peev xwm lub zog khaws cia nyob rau hauv lub elongated xyaum hlua rau kinetic zog. Tom qab qhov kev txiav txim ntawm jarring tshwm sim, lub zog kinetic no ua rau muaj kev cuam tshuam nthwv dej uas xa lub zog jarring mus rau txoj hlua khi hlua, pab kom dawb.
Lub zog ntawm qhov cuam tshuam nthwv dej cuam tshuam rau qhov nrawm ntawm lub cuab yeej jarring, thaum lub sijhawm ntawm nthwv dej cuam tshuam rau qhov ntev ntawm txoj hlua laum. Lawv txoj kev sib raug zoo yog raws li nram no:
Kinetic Zog=1/2MV^2
Qhov twg M sib npaug qhov hnyav ntawm txoj hlua laum saum lub thawv, thiab V yog qhov nrawm ntawm lub thawv thaum muaj kev cuam tshuam.
Muaj peb yam tseem ceeb ntawm cov cuab yeej jarring: mechanical jars, hydraulic jars, thiab hydraulic-mechanical jars.
Mechanical Jars
Neeg kho tshuabdrilling hubSiv ib tug series ntawm springs, detents, thiab tso mechanisms los tsim lub jarring cuam tshuam. Lawv hub upwards thaum lub overpull mus txog ib tug pre-set txwv thiab thawv down thaum lub overpull mus txog rau lwm pre-set txwv. Lub thawv tsuas yog qhib rau hauv cov kev txwv no, uas feem ntau yog siab dua cov rog uas tau ntsib thaum lub sij hawm ib txwm drilling. Thaum lub sijhawm ua haujlwm tsis tu ncua, lub thawv tshuab tshuab yog nyob rau hauv ib qho chaw nruab nrab lossis lub xeev overpulled, tab sis yeej tsis tau ntim rau hauv lub thawv vim qhov no tuaj yeem ua rau cov hlua tho hauv qab no puas.
Cov txheej txheem tso tawm tuaj yeem teeb tsa ntawm qhov chaw lossis qhov chaw, nyob ntawm lub thawv tsim. Muaj ob lub ntsiab mechanical thawv tsim:
1) Torsion caij nplooj ntoos hlav style - Cov no yog pre-loaded ntawm nto rau upwards thiab downwards jarring loads. Lub thawv tua hluav taws yog qhib los ntawm kev siv 10-15% torque variations rau txoj hlua xyaum (sab laug-tes torque txo qis overpull, sab tes xis nce).
2) Lub tes tsho txuas nrog grooves thiab latch springs - Lub load rau tua hluav taws lub hub yog txo los ntawm kev nce cov av nkos twj tso kua mis. Lub Anadrill EQ Mechanical Jar siv txoj cai no.
Hydraulic Jars
Hydraulicdrilling hubmuaj ob qhov chaw piston sib cais los ntawm lub valve. Thaum tensional los yog compressional rog tau siv los qhib lub thawv, cov kua dej hauv ib cheeb tsam piston yog compressed thiab yuam los ntawm txoj kev txwv tsis pub nkag mus rau hauv cheeb tsam thib ob. Tus nqi ntws tswj lub sijhawm tua - ntau zog muab lub sijhawm tua sai dua. Qhov kev mob stroke no hu ua "power stroke". Thaum lub zog stroke nce mus txog nws qhov kev txwv, cov kua dej ntws tawm los ntawm kev hla cia qhov chaw sib txawv ntawm cov piston kom nrawm nrawm nrawm thiab cuam tshuam.
Hydraulic hub tsis xav tau pre-set firing loads - lub firing quab yuam yog proportional rau qhov loj ntawm overpull los yog compression thov. Siab zog yields siab loads. Ib qho txiaj ntsig tseem ceeb yog tias hydraulic jars tuaj yeem tsim ntau yam sib txawv ntawm cov jarring rog hauv lawv qhov kev ntaus nqi. Lawv kuj feem ntau muaj cov diameters loj dua li cov hub rau cov cuab yeej loj.
Yog tias lub sijhawm tso cai, lub thawv hydraulic yuav rov ua qaib thiab hluav taws dua thaum lub zog stroke tiav. Qhov no ua rau lawv muaj txiaj ntsig zoo nyob rau hauv lub kaum sab xis siab lossis kab rov tav qhov dej uas txwv tsis pub dhau yuav muaj. Txawm li cas los xij, nws tuaj yeem ua rau qhov tsis pom kev tua hluav taws, tshwj xeeb tshaj yog nyob rau hauv ntu ntsug.
Kev siv hluav taws xob ntau tuaj yeem ua rau hydraulic overheating uas txo cov kua dej viscosity, ua kom lub zog stroke lub sij hawm luv luv, thiab ua rau lub sijhawm ua haujlwm ntxov ua ntej qhov xav tau overpull - txo qhov cuam tshuam quab yuam.
Ib qho txiaj ntsig tseem ceeb ntawm cov rhawv zeb tshuab yog tias lawv tsuas yog hluav taws thaum ua ntej kev txwv quab yuam tau mus txog. Lawv tiv taus ntau dua rau kev tua hluav taws tsis zoo thiab muaj lub neej ua haujlwm ntev dua piv rau cov hub hydraulic.
Vigor yuav muab kev daws teeb meem rau koj, Thov hu rau peb ntawminfo@vigorpetroleum.com.
