CAJ | 학술논문

在碳酸盐岩油藏酸化中，裸眼完井和射孔完井对酸蚀溶解形态特征的影响不同。酸液在裸眼完井的井筒中与岩石接触面积远大于射孔完井，酸液受地层非均质性的影响选择性地进入地层，这与射孔完井时酸液针对性地进入地层不同，有必要对不同完井方式的酸蚀溶解形态进行研究。通过一种达西–孔隙双重尺度模型，创新性地利用正态分布函数生成模拟区域初始孔隙度值，研究了射孔完井对酸蚀溶解形态的影响，并分析了孔眼沿程滤失的影响。结果表明：由于射孔在孔眼区产生局部高导流能力的通道，酸液通过孔眼进入地层，溶解形态与裸眼完井不同，且射孔越短蚓孔分支越多，射孔越长蚓孔分支越少；同一注入速度下，孔眼沿程无滤失的突破体积最小，裸眼完井的突破体积最大；完井方式和滤失对蚓孔形成的最优注入速度没有影响；当注入速度较小时，由于反应前缘与残酸前缘距离很小，在酸液临近突破时压力骤然下降，当注入速度较大时，由于反应前缘较宽，压降比较平缓。
재탄산염암유장산화중，라안완정화사공완정대산식용해형태특정적영향불동。산액재라안완정적정통중여암석접촉면적원대우사공완정，산액수지층비균질성적영향선택성지진입지층，저여사공완정시산액침대성지진입지층불동，유필요대불동완정방식적산식용해형태진행연구。통과일충체서–공극쌍중척도모형，창신성지이용정태분포함수생성모의구역초시공극도치，연구료사공완정대산식용해형태적영향，병분석료공안연정려실적영향。결과표명：유우사공재공안구산생국부고도류능력적통도，산액통과공안진입지층，용해형태여라안완정불동，차사공월단인공분지월다，사공월장인공분지월소；동일주입속도하，공안연정무려실적돌파체적최소，라안완정적돌파체적최대；완정방식화려실대인공형성적최우주입속도몰유영향；당주입속도교소시，유우반응전연여잔산전연거리흔소，재산액림근돌파시압력취연하강，당주입속도교대시，유우반응전연교관，압강비교평완。
In carbonate acidizing,different completion methods have different effects on dissolution patterns caused by acidiza-tion. In this paper,we use a normal distribution function to generate initial porosity values and a two-scale continuum model to study the effects of perforation completion on dissolution patterns and analyze the effect of leakoff along the aperture. The results show that the dissolution pattern is very different from that of openhole completion. Acid flows into the formation through perforation tunnel,and the number of wormhole branches increases with the decrease of perforation length. Under the same injection velocity,the breakthrough volume of perforation completion without leakoff along the aperture is the least and that of open-hole completion is the most. Completion and leakoff rarely have effects on the optimum injection velocity. At small injection velocity,the inlet pressure declines sharply in the termination regime because of a very small distance between reaction front and spent acid front;at large injection velocity,the inlet pressure declines slowly due to the wide reaction front.