CAJ | 학술논문

柴达木盆地深井固井作业中，由于某些钻井液性能不达标或胶塞封闭不严致使部分水泥浆与顶替钻井液发生絮凝反应等原因，导致固井质量电测仪器下不到井底。为此，研制了无固相压胶塞隔离液。通过压胶塞隔离液的抗水泥浆污染性能、高温稳定性能和沉降稳定性能等评价实验，优选出深井完井压胶塞隔离液配方。现场应用结果表明，在胶塞和顶替钻井液之间的300~500 m 的无固相隔离液段，可有效阻止套管内残留水泥浆与钻井液发生絮凝反应，并减缓固相颗粒的沉降堆积，保证电测仪器顺利下井。使用无固相压胶塞隔离液的37口深井，完井固井质量电测一次成功率达到了100%，有效缩短了完井作业施工周期。
시체목분지심정고정작업중，유우모사찬정액성능불체표혹효새봉폐불엄치사부분수니장여정체찬정액발생서응반응등원인，도치고정질량전측의기하불도정저。위차，연제료무고상압효새격리액。통과압효새격리액적항수니장오염성능、고온은정성능화침강은정성능등평개실험，우선출심정완정압효새격리액배방。현장응용결과표명，재효새화정체찬정액지간적300~500 m 적무고상격리액단，가유효조지투관내잔류수니장여찬정액발생서응반응，병감완고상과립적침강퇴적，보증전측의기순리하정。사용무고상압효새격리액적37구심정，완정고정질량전측일차성공솔체도료100%，유효축단료완정작업시공주기。
In cementing jobs in deep wells in Qaidam Basin, due to some substandard drilling fluid properties or poor sealing of rubber plug, some cement slurry reacted with displacing drilling fluid and got flocculated, which caused cementing problems and the electric log could not be lowed to hole bottom. For this reason, the solid-free rubber plug pressed spacer fluid was developed. By evalu-ating experiments on the performances of resistance to cement contamination, high temperature and subsidence stability of rubber plug pressed spacer fluid, the best formula of plug pressed spacer fluid was selected for deep well completions. Field application shows that the solid-free spacer fluid of 300~500 m between the plug and displacing drilling fluid can effectively prevent the remaining cement in the casing from being flocculated with drilling fluid and also slow down settling and piling up of solid particles. In 37 deep wells where solid-free plug spacer fluid was used, the one-time success rate of electric log for completion cementing quality was 100%, effectively shortening the period of completion operations.