中国石油大学学报(自然科学版)
中國石油大學學報(自然科學版)
중국석유대학학보(자연과학판)
JOURNAL OF CHINA UNIVERSITY OF PETROLEUM(EDITION OF NATURAL SCIENCE)
2014年
4期
81-86
,共6页
程宇雄%李根生%王海柱%沈忠厚%田守嶒%蔡承政
程宇雄%李根生%王海柱%瀋忠厚%田守嶒%蔡承政
정우웅%리근생%왕해주%침충후%전수증%채승정
超临界二氧化碳%射流%压裂%流场%数值模拟
超臨界二氧化碳%射流%壓裂%流場%數值模擬
초림계이양화탄%사류%압렬%류장%수치모의
supercritical carbOn diOxide%jet%fracturing%flOw field%numerical simulatiOn
为了证实利用超临界二氧化碳( CO2)流体进行喷射压裂的可行性,利用Span-Wagner气体状态方程建立超临界CO2流场的计算流体力学模型,模拟超临界CO2喷射压裂过程中的孔内流场。结果表明:在喷嘴压降相同的条件下,与水射流相比,超临界CO2射流的射流速度更高,射流核心区更长;超临界CO2喷射压裂具有比水力喷射压裂更强的射流增压效果,更容易压开地层;超临界CO2射流具有显著的焦耳-汤姆逊效应,会导致温度下降,在压裂施工中应合理控制喷嘴压降,以防发生冰堵事故;超临界CO2的密度主要受压力影响,通过调节压力就能有效控制,可适应不同的地层温度条件。
為瞭證實利用超臨界二氧化碳( CO2)流體進行噴射壓裂的可行性,利用Span-Wagner氣體狀態方程建立超臨界CO2流場的計算流體力學模型,模擬超臨界CO2噴射壓裂過程中的孔內流場。結果錶明:在噴嘴壓降相同的條件下,與水射流相比,超臨界CO2射流的射流速度更高,射流覈心區更長;超臨界CO2噴射壓裂具有比水力噴射壓裂更彊的射流增壓效果,更容易壓開地層;超臨界CO2射流具有顯著的焦耳-湯姆遜效應,會導緻溫度下降,在壓裂施工中應閤理控製噴嘴壓降,以防髮生冰堵事故;超臨界CO2的密度主要受壓力影響,通過調節壓力就能有效控製,可適應不同的地層溫度條件。
위료증실이용초림계이양화탄( CO2)류체진행분사압렬적가행성,이용Span-Wagner기체상태방정건립초림계CO2류장적계산류체역학모형,모의초림계CO2분사압렬과정중적공내류장。결과표명:재분취압강상동적조건하,여수사류상비,초림계CO2사류적사류속도경고,사류핵심구경장;초림계CO2분사압렬구유비수력분사압렬경강적사류증압효과,경용역압개지층;초림계CO2사류구유현저적초이-탕모손효응,회도치온도하강,재압렬시공중응합리공제분취압강,이방발생빙도사고;초림계CO2적밀도주요수압력영향,통과조절압력취능유효공제,가괄응불동적지층온도조건。
TO verify the feasibility Of supercritical carbOn diOxide ( SC-CO2 ) jet fracturing, a cOmputatiOnal fluid dynamic mOdel was established based On Span-Wagner state equatiOn tO simulate the flOw field in the cavity during SC-CO2 jet fractu-ring. The results shOw that in cOmparisOn with water jet, the SC-CO2 jet has higher jet energy and experiences less energy at-tenuatiOn. It alsO has higher pressure bOOsting effect than water jet fracturing. JOule-ThOmsOn effect can happen during SC-CO2 jet and lead tO temperature decrease. TherefOre nOzzle pressure drOp shOuld be reasOnably cOntrOlled during the jet frac-turing prOcess tO avOid ice blOck. The density Of SC-CO2 is mainly influenced by pressure instead Of temperature. SO it can be cOntrOlled by adjusting pressure fOr it tO wOrk under different fOrmatiOn temperatures.