CAJ | 학술논문

塔里木盆地三叠系储层为中孔中-高渗储层，孔隙结构呈强非均质性，潜在固相侵入、微粒运移、出砂、流体敏感性损害严重，水平井完井投产后自喷、气举困难，甚至没有产量。原井浆粒度分析、动态损害评价实验表明，原井浆对渗透率100 mD以上的储层保护能力不佳，返排恢复率低于50%。根据屏蔽暂堵原理对原井浆进行改性，并开展了改性浆粒度分析及动态损害评价；利用FEI Quanta 450环境扫描电镜观察了原井浆及改性浆的滤饼结构，借助分形几何理论分析了滤饼孔隙率、孔径和分形维数等结构参数。结果表明：改性钻井完井液能形成致密的滤饼，有效封堵储层孔喉，返排恢复率达90%以上。将改性配方应用到工区水平井钻井现场试验，投产后实现了开井高产自喷。
탑리목분지삼첩계저층위중공중-고삼저층，공극결구정강비균질성，잠재고상침입、미립운이、출사、류체민감성손해엄중，수평정완정투산후자분、기거곤난，심지몰유산량。원정장립도분석、동태손해평개실험표명，원정장대삼투솔100 mD이상적저층보호능력불가，반배회복솔저우50%。근거병폐잠도원리대원정장진행개성，병개전료개성장립도분석급동태손해평개；이용FEI Quanta 450배경소묘전경관찰료원정장급개성장적려병결구，차조분형궤하이론분석료려병공극솔、공경화분형유수등결구삼수。결과표명：개성찬정완정액능형성치밀적려병，유효봉도저층공후，반배회복솔체90%이상。장개성배방응용도공구수평정찬정현장시험，투산후실현료개정고산자분。
The Triassic reservoir with medium porosity and medium-high permeability in the Tarim Basin,exhibits intensively heterogeneous pore structure,and serious potential damage of solid invasion,particle migration,sanding,fluid sensitivity. After completion,horizontal wells can not produce through natural power or gas-lift. The results of granularity analysis and dynamic damage evaluation experiments present that the original drilling and completion fluids can not protect the reservoir with permeability of more than 100 mD,while the percentage of regained permeability is less than 50%. According to the mechanism of shielding temporary plugging technology,the original drilling and completion fluids are optimized,and the granularity analysis and dynamic damage evaluation experiments of optimized fluids are carried out. The structure of filter cakes,both the original and optimized drilling and completion fluids,are observed through the FEI Quanta 450 environment scanning electron microscope,then the porosity,pore size and fractal dimension of the filter cakes are analyzed with fractal geometry theory. All results indicated that the optimized drilling and completion fluids can form tight filter cakes,plug the pore of reservoir effectively,and enhance the percentage of regained permeability of core samples up to 90%. After applying optimized drilling and completion fluids,horizontal wells achieved production through natural power and got high production after completion.