CAJ | 학술논문

N80-1油管在进行油层水力压裂作业过程中发生脆性开裂，采用断口宏观分析、断口微观分析、金相检验等方法，对其开裂原因进行了系统的分析。结果表明，失效油管理化性能均符合API SPEC 5 CT—2011标准规定值。该油管内壁存在一条深0．2～0．8 mm的缺陷是导致该油管在压裂过程中发生开裂的主要原因。经对失效油管实物以及金相组织形态观察，初步认定缺陷为芯棒划伤。另外，N80-1油管的断裂韧性KIC值较低亦加速该油管发生脆性开裂。改选用断裂韧性KIC值高的油管进行压裂作业将会降低压裂过程中油管发生脆性开裂的概率。
N80-1유관재진행유층수력압렬작업과정중발생취성개렬，채용단구굉관분석、단구미관분석、금상검험등방법，대기개렬원인진행료계통적분석。결과표명，실효유관이화성능균부합API SPEC 5 CT—2011표준규정치。해유관내벽존재일조심0．2～0．8 mm적결함시도치해유관재압렬과정중발생개렬적주요원인。경대실효유관실물이급금상조직형태관찰，초보인정결함위심봉화상。령외，N80-1유관적단렬인성KIC치교저역가속해유관발생취성개렬。개선용단렬인성KIC치고적유관진행압렬작업장회강저압렬과정중유관발생취성개렬적개솔。
Brittle fracture occurs to N80-1 tubing during hydraulic fracturing operation at oil reservoir . Adopting the methods of macro analysis on fracture , micro analysis on fracture , metallographic test , etc, systematic analysis on the reasons to fracture was performed .The test results showed that properties of the failure tubing conform to API SPEC 5CT-2011.The results indicated that the primary reason of the fracture was the scratch of 0.2-0.8 mm existed in the inner wall of tubing , which happened due to mandrel .In addition, low fracture toughness K IC of N80-1 tubing also enhanced the brittle fracture to this tubing .When the tubing with higher fracture toughness KIC was selected , it would reduce the probability of brittle fracture to tubing during fracturing process .