CAJ | 학술논문

两伊边界轻质油油田主力产层A油组在生产过程中，沥青质在井筒析出、沉淀的现象很严重，是无水开采阶段影响油井生产时率的主要因素之一。A油组异常高压，地层原油中高含硫化氢，所以整个作业过程，油管和油套环空之间不允许建立循环，这些都给井筒沥青质沉淀清除工作带来了很大困难。本次施工先采用泵车小排量控压、分段挤入、分段浸泡以及分段返排的工艺，挤入过程中井筒被沥青沉淀堵死，之后改用连续油管通洗井和泵车小排量控压挤入与浸泡相结合的工艺，顺利完成作业，使油井恢复正常生产。本次作业历时5 d，现场施工过程艰难复杂，通过作业认识到高效的沥青质沉淀溶剂、连续油管通洗、泵车控压控排量挤入、浸泡时间和浸泡深度几方面紧密配合是保证施工成功的关键。
량이변계경질유유전주력산층A유조재생산과정중，력청질재정통석출、침정적현상흔엄중，시무수개채계단영향유정생산시솔적주요인소지일。A유조이상고압，지층원유중고함류화경，소이정개작업과정，유관화유투배공지간불윤허건립순배，저사도급정통력청질침정청제공작대래료흔대곤난。본차시공선채용빙차소배량공압、분단제입、분단침포이급분단반배적공예，제입과정중정통피력청침정도사，지후개용련속유관통세정화빙차소배량공압제입여침포상결합적공예，순리완성작업，사유정회복정상생산。본차작업력시5 d，현장시공과정간난복잡，통과작업인식도고효적력청질침정용제、련속유관통세、빙차공압공배량제입、침포시간화침포심도궤방면긴밀배합시보증시공성공적관건。
During production of the major productive zone-Oil Reservoir A in light oil oilifeld close to Iran and Iraq borders, asphaltene precipitation and settling in wellbore is a severe problems and is one of the factors which affect the production time efifciency of oil wells in water-free production period. The Oil Reservoir A has anomalously high pressure and formation crude oil contains large amount of hydrogen sulphide (H2S), so no circulation should be established between the tubing and casing annulus during the operation process. All these factors pose great dififculty for removing the asphaltene precipitation on wellbore. In this job, the pumping unit was ifrstly used to control the pressure with small displacement, squeeze in lfuid in stages and soak in stages and lfow back in stages. During squeezing, the wellbore was fully blocked by asphaltene precipitation.Then coiled tubing was used to drift and wash the well in conjunction with controlling the pressure by pumping unit with small displacement and soaking. The job was completed successfully and the oil well resumed normal production. This job lasted 5 days and experienced very dififcult and complex times. From the job, it is learned that close combination of efifcient asphaltene precipitation solvent, drifting by coiled tubing, squeezing by pumping unit with controlled pressure and displacement, soaking duration and soaking depth is the key to the success of the job.