Underbalanced drilling, tseem hu ua qhov tsis zoo siab drilling, yog hais txog kev siv tshuab drilling hauv qab lub qhov siab tsawg dua qhov kev tsim siab thaum lub sij hawm drilling, thiab cov dej hauv av nkag mus rau hauv qhov dej thiab ncig mus rau qhov chaw hauv kev tswj xyuas.
Lub underbalanced drilling series tau muab faib ua:
① Gas drilling, suav nrog huab cua, nkev roj thiab nitrogen drilling, qhov ntom ntom {{0}} ~ 0.02 g / cc;
② Atomizing drilling, ceev ntau yam {{0}}.02 ~ 0.07g/cc;
(3) Ua npuas ncauj drilling kua, suav nrog ruaj khov thiab tsis ruaj khov ua npuas ncauj drilling, haum qhov ntom ntom 007 ~ 0.60 g / cc;
④ Aerated drilling kua drilling, suav nrog los ntawm kev txhaj tshuaj roj riser thiab cov roj tso rau hauv ob txoj kev. Downhole roj txhaj tshuab yog txhaj rau huab cua, nkev thiab nitrogen rau hauv downhole drilling kua thaum drilling los ntawm parasitic yeeb nkab, concentric yeeb nkab, laum hlua thiab coiled tubing. Nws qhov ceev yog siv tau nyob rau hauv qhov ntau ntawm {{0}}.7 ~ 0.9 g / cc, uas yog ib qho kev siv dav siv underbalanced drilling txoj kev.
⑤ Dej los yog brine drilling kua drilling, qhov ceev ntawm 1 ~ 1.30g / cc;
⑥ dej-hauv-roj lossis roj-hauv-dej drilling kua dej drilling, qhov ntom ntom yog 0.8 ~ 1.02 g / cc;
⑦ cov pa drilling kua dej (siv ceev reducer), qhov ceev yog ntau tshaj 0.9 g/cc;
⑧Mud cap drilling, lub npe hu ua ntab av nkos drilling txawv teb chaws, yog siv los tho qhov sib sib zog nqus siab siab tawg txheej los yog high hydrogen sulfide gas txheej.
Underbalanced drilling thev naus laus zis tuaj yeem muab faib ua ob hom raws li kev faib tawm thev naus laus zis: ntws drilling yog hais txog qhov tsis sib xws ntawm qhov drilling siv cov kua dej zoo tib yam; Artificially induced underbalance drilling txhais tau hais tias vim tsis tshua muaj siab, tshwj xeeb drilling kua thiab tshuab yuav tsum tau siv los tsim underbalance.
