CAJ | 학술논문

煤田开采过程中为了保证安全,改善地下工作面环境,近年来不断进行钻大口径井用以抽排瓦斯、向地下送风降温.然而钻井使用的是小钻机,完井作业时由于钻机提升能力有限,大口径套管按照石油工程方法下入困难.套管内、外环空容积大,注水泥过程中易发生浆体混窜,作业时间长,固井质量难以保证.通过采用浮力塞减重、管柱充空气、优化水泥浆体系及浆柱结构设计和内插管固井工艺等技术,成功地解决了小钻机下大口径套管超负荷、大口径套管抗挤强度低、易被挤毁等一系列技术难题.现场进行了9口井应用,固井成功率100%,固井质量合格,为今后超大口径套管固井提供了可借鉴的经验.
매전개채과정중위료보증안전,개선지하공작면배경,근년래불단진행찬대구경정용이추배와사、향지하송풍강온.연이찬정사용적시소찬궤,완정작업시유우찬궤제승능력유한,대구경투관안조석유공정방법하입곤난.투관내、외배공용적대,주수니과정중역발생장체혼찬,작업시간장,고정질량난이보증.통과채용부력새감중、관주충공기、우화수니장체계급장주결구설계화내삽관고정공예등기술,성공지해결료소찬궤하대구경투관초부하、대구경투관항제강도저、역피제훼등일계렬기술난제.현장진행료9구정응용,고정성공솔100%,고정질량합격,위금후초대구경투관고정제공료가차감적경험.
?In?the?exploiting?process?in?Coal?field,?in?order?to?guarantee?the?safety?and?improve?the?underground?working?environment,?large?diameter?wells?are?being?drilling?for?gas?drainage?and?air?blasting?to?cool?the?underground?in?recent?years.?However,?the?drilling?rig?is?small?with?limited?lifting?capacity,?so?the?large?diameter?casing?is?difficult?to?trip?down?in?petroleum?engineering?method?during?well?comple-tion.?The?large?outer?and?inner?annular?volumes?make?cementing?slurry?easily?to?channel?during?injection,?resulting?in?long?working?time,?so?it?is?difficult?to?ensure?the?cementing?quality.?Through?losing?weight?by?buoyancy?piston,?flushing?air?in?pipe?column,?optimizing?slurry?system?and?interpolated-pipe?cementing?technology,?the?difficulties?were?successfully?resolved,?which?were?tripping?the?large?diameter?cas-ing?by?small?drilling?rigs,?low?squeezing?strength?of?large?diameter?casing,?etc.?The?on-site?field?applications?on?9?wells?showed?the?results?of?100%?cementing?success?rate,?and?good?cementing?quality.?It?provides?experiences?for?the?future?cementing?by?super?diameter?casing.