CAJ | 학술논문

为了改善径向水平井水力破岩和携砂效果,以多相流理论为基础,借鉴欠平衡钻井基本原理,把欠平衡技术引入到径向水平井设计和施工中,研究了径向水平井施工中压力控制问题,建立了径向水平井施工的物理模型和气混两相流动模型,并对径向水平井施工中注气量对井内压力的影响关系和规律进行了计算和分析.结果表明,氮气的注入可以有效降低井底压力,同时利用充氮气钻井液可同步携带岩屑返出地面;井底压力与注气速度和钻井液排量有关,注气速度越大,钻井液排量越小,井底压力降低幅度越大;环空岩屑只有当钻井液排量达到一定时,配合适当的注气速度才能被安全携带出地面.研究结果为进行径向水平井欠平衡施工的设计提供了理论依据.
위료개선경향수평정수력파암화휴사효과,이다상류이론위기출,차감흠평형찬정기본원리,파흠평형기술인입도경향수평정설계화시공중,연구료경향수평정시공중압력공제문제,건립료경향수평정시공적물리모형화기혼량상류동모형,병대경향수평정시공중주기량대정내압력적영향관계화규률진행료계산화분석.결과표명,담기적주입가이유효강저정저압력,동시이용충담기찬정액가동보휴대암설반출지면;정저압력여주기속도화찬정액배량유관,주기속도월대,찬정액배량월소,정저압력강저폭도월대;배공암설지유당찬정액배량체도일정시,배합괄당적주기속도재능피안전휴대출지면.연구결과위진행경향수평정흠평형시공적설계제공료이론의거.
@@@@In order to improve the hydraulic breaking rock ability and sand carrying effect in radial horizontal well, based on the multiphase?flow?theory,?underbalanced?drilling?technology?was?introduced?into?the?design?and?drilling?of?new?type?radial?horizontal?well?by using the basic principle of underbalanced drilling. Research on the pressure control during construction was conducted, and physical model and two phase (gas-liquid)flow?model?were?established?to?calculate?and?analyze?the?relationships?and?rules?of?the?amount?of?gas?injection and wellbore pressure of radial horizontal well In the process of construction. As conclusion, nitrogen injecting can effectively decrease bottom hole pressure (BHP),?and?drilling?fluid?mixed?nitrogen?could?help?carrying?rock?fragments?flow?back?to?ground;?BHP?not?only?related?with?gas?injection?speed?but?also?related?with?the?flow?rate?of?base?fluid,?which?means?that?higher?gas?injection?speed?and?smaller?fluid?rate?greatly?reduce?BHP;?annular?cuttings?with?appropriate?gas?injection?rate?will?carry?out?of?the?ground?only?if?the?drilling?fluid?volume?reaches?a?certain?value.?This?conclusion?will?provide?a?theoretical?basis?for?construction?design?of?new?type?radial?horizontal well.