CAJ | 학술논문

充气欠平衡钻井是目前煤层气钻井中最常用的技术手段,如何在控制注气压力、注气量以及排量等参数的情况下,使得钻进时既能满足携岩要求,又能有效地控制井底压力是一个难题.应用FLUENT软件,通过对不同的注气压力、注气量以及排量条件下的计算模拟,得出U型井直井造穴处的压降规律,并基于此,优选确定出一套合理的工艺参数,确保在充气欠平衡钻井过程中,既能形成期望流型、满足携岩要求,又能有效控制井底压力.通过一口井的实钻数据建立了分析模型,并进行了计算模拟,最终优化出注气压力、注气量和泵排量等参数,总结出其变化规律.该研究成果对保障钻井作业安全及优化钻井作业有一定的借鉴作用.
충기흠평형찬정시목전매층기찬정중최상용적기술수단,여하재공제주기압력、주기량이급배량등삼수적정황하,사득찬진시기능만족휴암요구,우능유효지공제정저압력시일개난제.응용FLUENT연건,통과대불동적주기압력、주기량이급배량조건하적계산모의,득출U형정직정조혈처적압강규률,병기우차,우선학정출일투합리적공예삼수,학보재충기흠평형찬정과정중,기능형성기망류형、만족휴암요구,우능유효공제정저압력.통과일구정적실찬수거건립료분석모형,병진행료계산모의,최종우화출주기압력、주기량화빙배량등삼수,총결출기변화규률.해연구성과대보장찬정작업안전급우화찬정작업유일정적차감작용.
@@@@Nowadays, aerated underbalanced drilling becomes one of the most commonly used techniques in coalbed methane drill-ing.?It?is?difficult?to?satisfy?the?rock?cuttings?portability?requirement?and?control?the?stability?of?bottom?hole?pressure,?while?controlling?the gas injection pressure, rate, and volume. The pressure drop performance is obtained at the corresponding cave through numerical simulation by FLUENT software under different gas injection pressure, rate and volume. So a reasonable set of technical parameters are?selected,?which?can?guarantee?the?expected?flow?type?to?fulfill?the?rock?portability?requirements,?and?stabilize?the?bottom?hole?pres-sure during aerated underbalanced drilling. An analyzing model is built up through the real-time parameters from one well, and the gas injection pressure, rate and volume are optimized, following with the parameter varying rules. The results have some guidance to ensure drilling safety and optimize drilling operations.