CAJ | 학술논문

砂岩矿物组成的复杂性决定了酸化酸液体系选择困难，采用室内物理模拟实验，结合电镜扫描技术，分析了经验选择的酸液体系对 TZ气藏两类典型砂岩储层的酸化效果影响，根据酸化物理模拟实验优选了两类储层的酸液体系。实验结果表明，碳酸盐矿物含量高（大于20％（ w ））、岩石胶结疏松的储层，仅用15％（w）HCl酸化不能解除钻井液污染，需采用前置酸（15％（w）HCl）与主体酸（12％（w）HCl＋1％（w）HF）相结合，并适当减小用酸量；泥质含量高、岩石胶结强度高的储层，采用前置酸（12％（w）HCl）与主体酸（13．5％（w）HCl＋2％（w）HF）相结合，适当增加用酸量。实验研究表明，一套酸液体系难以解决复杂砂岩储层的酸化问题。现场应用试验表明，实验优选的酸液体系能较好地解除储层污染，提高酸化效果。
사암광물조성적복잡성결정료산화산액체계선택곤난，채용실내물리모의실험，결합전경소묘기술，분석료경험선택적산액체계대 TZ기장량류전형사암저층적산화효과영향，근거산화물리모의실험우선료량류저층적산액체계。실험결과표명，탄산염광물함량고（대우20％（ w ））、암석효결소송적저층，부용15％（w）HCl산화불능해제찬정액오염，수채용전치산（15％（w）HCl）여주체산（12％（w）HCl＋1％（w）HF）상결합，병괄당감소용산량；니질함량고、암석효결강도고적저층，채용전치산（12％（w）HCl）여주체산（13．5％（w）HCl＋2％（w）HF）상결합，괄당증가용산량。실험연구표명，일투산액체계난이해결복잡사암저층적산화문제。현장응용시험표명，실험우선적산액체계능교호지해제저층오염，제고산화효과。
The option of acid system in complex sandstone acidizing was difficult due to the in-tricacy mineral composition .The influence of acid system on acidizing effect of two types of typi-cal sandstone in TZ gas reservoir was analyzed by physical simulation experiments combining with SEM .Thereby ,the acid system of two kinds of sandstone reservoir was optimized .The re-sults showed that because the hydrochloric acid (15wt% ) acidification alone could not remove drilling mud pollution in the reservoir ,acid system of preflush (15w t% HCl) should be incorpo-rated with main acid (12wt% HCl+1wt% HF) appling to the unconsolidated sand reservoir with high carbonate mineral content (more than 20% ) ,and the amount of acid should be decreased . However ,the sandstone reservoir with high argillaceous content and cementation strength should increase the acid amount and integrated the preflush (12w t% HCl) with main acid (13 .5w t % HCl+2wt % HF) .The experimental results suggest that one set of acid system is difficult to meet the needs of complex sandstone reservoir acidizing .The field application shows that new acid sys-tems can remove the damage easily and improve the acidizing effect .