Stand-Off Gap Ntau dhau los yog tsis kaw raws li qhov tsawg kawg nkaus Make-Up lossis nyuaj tawg tawm
* Ntxuav thiab tshuaj xyuas cov xov rau txawv teb chaws ntau dhau los yog hnav cov khib nyiab.
* Kev hnav nrawm yuav yog vim cov khoom siv puas tsuaj - tshuaj xyuas cov khoom siv (xws li adapter subs).
* Cov pas nrig ntawm cov chaw tsim khoom sib txawv yuav tsum sib cais thiab tsis txhob hloov cov pas nrig.
* Cov xov yog deformed los ntawm overload los yog overload thaum lub sij hawm ua thiab tawg. Tshawb xyuas txoj hlua rau kev puas tsuaj thiab pov tseg rods nrog deformed threads. Overload los yog nyuaj tawg tej zaum yuav yog vim tsis zoo xaiv ntawm xov compound (saib lubrication thiab tu thiab tawg-tawm).
* Deformation vim hammering puas (saib tawg-tawm) lossis stabbing puas (saib stabbing).
* Tshawb xyuas txoj hlua thiab pov tseg cov pas nrig puas lawm.
Fatigue Failures lossis Cracked Pins lossis Boxes (Saib Fatigue Strength)
* Extraneous hoop stresses (saib glossary) tshwm sim los ntawm deformation vim hammering puas (saib break-out), stabbing puas (saib stabbing), ntau txawv teb chaws khib nyiab, los yog hnav cov khib nyiab nyob rau hauv lub sib koom tes (saib xov hnav).
* Lub xub pwg nyom deformed vim overload tawm tus pin lossis lub thawv tsis txhawb nqa. Overload tej zaum yuav yog vim tsis zoo xaiv ntawm xov compound (saib lubrication thiab tu). Xav txog kev hloov kho rau AU rods.
* Khoov kev ntxhov siab tau dhau lub zog qaug zog ntawm kev sib koom tes. Khoov kev ntxhov siab yog tshwm sim los ntawm kev tswj ntau dhau, qhov sib txawv ntawm qhov ntau dhau los yog qhov tsua, lossis helical whirling (saib midbody hnav). Tsis txhob tshaj qhov sib txawv ntawm qhov ntsuas. Qhov no tej zaum yuav tau compounded los ntawm siab pullback loads ntawm qhov tob los yog ntau ntau make-up. Kev npaj deviations tshwm sim ntawm feem ntawm txoj hlua uas tsis tshua muaj rub rov qab (xws li zam qhov sab sauv ntawm txoj hlua qhov sib sib zog nqus). Kev qaug zog tuaj yeem dhau los ntawm daim ntawv thov dhau los thiab kev sib koom ua ke tam sim no mus txog qhov txwv (saib lub cim xeeb thiab qaug zog).
* Cov pas nrig khiav hauv xoob (cov pob qij txha tsis raug kaw) vim qhov tsis txaus los yog qhov sib txawv ntawm qhov sawv ntsug ntau dhau (saib ua rau ntau dhau ntawm kev sib tw).
* Lub thawv hnav lub neej tshaj. Tshawb xyuas txoj hlua kom hnav ntau dhau (saib hnav lub neej).
* Rods hlua tau raug kev txom nyem los ntawm hydrogen embrittlement (saib glossary). Hloov cov hlua hlua thiab siv cov xov tsis yog xim hlau.
* Qws yog cov khoom siv sib txawv. Cais tag nrho cov pas nrig los ntawm cov chaw tsim khoom thiab tsis txhob cuam tshuam.
Leakage (Saib Fluid Seal)
* Lub thawv bulging vim muaj kev ntxhov siab ntau dhau (saib glossary) cuam tshuam los ntawm xov, uas tuaj yeem dhau los ntawm kev thauj khoom ntau dhau.
* Pom tseeb los ntawm qhov chaw polished ntawm ib sab ntawm lub thawv lossis xov dhia hauv rooj plaub loj. Overload tej zaum yuav tshwm sim los ntawm kev xaiv tsis zoo ntawm xov compound (saib lubrication).
* Lub thawv hnav lub neej dhau los ua rau overload.Nrhiav txoj hlua rau hnav ntau dhau.
Xov Wear lossis Galling (Saib Xov Hnav)
* Cov xov sib txuas tau ua tsis tiav los tiv thaiv mating xov nto ntawm kev sib cuam tshuam. Qhov no yog vim tsis zoo los yog diluted compound los yog lubrication tsis zoo. Txhim kho xov sib txuas los yog ua kom ntau zaus ntawm kev ntxuav thiab rov ua cov pob qij txha.
* Xov xov sib cuag siab dhau lawm. Rau stab flank hnav, txo tus nqi pub / siab thiab / lossis nce kev sib hloov thaum ua thiab tawg.
* Rau kev thauj khoom flank hnav, nce tus nqi pub thiab / lossis txo kev sib hloov thaum ua thiab tawg. Cov pas nrig uas muaj qhov hnyav hnyav hnyav yuav tsum tau muab pov tseg.
* Kev hnav nrawm yuav yog vim cov khoom siv puas; tshuaj xyuas cov khoom siv rau kev puas tsuaj lossis hnav (xws li cov khoom siv hluav taws xob).
* Xov hnav lub neej tshaj. Kev hnav nrawm yuav yog vim cov khoom siv puas; tshuaj xyuas cov khoom siv (xws li adapter subs). Tshawb xyuas txoj hlua kom hnav ntau dhau.
Lub xub pwg sab nraud hnav lossis lub xub pwg sab nraud Flared / dov tshaj
* Lub xub pwg nyom flared thiab / los yog tus pin sab xub pwg dov vim yog overload.
* Tshaj dhau yuav yog vim kev xaiv tsis zoo ntawm cov xov sib txuas (saib lubrication).
* Lub xub pwg hnab hnav lub neej tshaj. Tshawb xyuas txoj hlua kom hnav ntau dhau.
Box Wear los yog Box Bulging los yog xov dhia (Saib lub thawv thiab Midbody Hnav)
* Lub thawv bulging vim muaj kev ntxhov siab ntau dhau (saib glossary) cuam tshuam los ntawm xov, uas tuaj yeem dhau los ntawm kev thauj khoom ntau dhau.
* Pom tseeb los ntawm qhov chaw polished ntawm ib sab ntawm lub thawv lossis xov dhia hauv rooj plaub loj. Overload tej zaum yuav tshwm sim los ntawm kev xaiv tsis zoo ntawm xov compound (saib lubrication).
* Lub thawv hnav lub neej dhau los ua rau overload.Nrhiav txoj hlua rau hnav ntau dhau.
Premature Midbody Hnav los yog Drilling siab rau Que
* Qhov sib txawv ntawm qhov sib txawv (xws li lub qhov drilled qhov, wedging, lossis down-hole saib xyuas) ua rau muaj kev sib cuag thiab kev sib txhuam ntawm txoj hlua thiab lub qhov los yog cov phab ntsa.
* Lub qhov muaj qhov loj lossis 'qhov tsua' ntu tso cai rau txoj hlua kom elastically khoov lossis buckle hauv qab thauj khoom nce kev sib cuag thiab kev sib txhuam.
* Txo qhov drilling loads lossis kev sib hloov ceev kom them nyiaj lossis kho qhov.
* Siab rub rov qab los yog thrust load ua ke nrog kev sib hloov ceev tau ua rau txoj hlua elastically los yog mus tas li khoov, nce kev sib cuag thiab kev sib txhuam ntawm lub qhov los yog phab ntsa.
* Pom tseeb los ntawm polished los yog hnyav hnav ntawm ib sab ntawm txoj hlua nyob rau hauv ib tug qeeb kauv qauv (xws li kauv muaj ntau lub suab ntev). Txo qhov drilling loads thiab / lossis rub rov qab.
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