摘要
在石油钻井工程中,影响井壁稳定性的因素较多。利用三维有限元数值分析方法,模拟分析裂缝对直立井井壁力学稳定性的影响。模拟结果表明,所有裂缝都对井壁的稳定性产生负面影响,但影响程度随裂缝的类型、产状、密度、组合特征及埋藏深度的不同而各异,一般规律如下:水平裂缝>倾斜裂缝>直立裂缝,即随着倾角的增大,裂缝对井壁稳定性的影响程度减小;多组裂缝组合比单一裂缝对井壁稳定性的影响大;密度越大,越容易造成井壁失稳;埋藏深度越深,裂缝对井壁稳定性的影响就越小。
Many factors can influence stability of well wall in the area of petroleum drilling engineering.Using 3-D numeric analysis technology,authors of this paper simulates the influence of fractures on the stability of petroleum well wall.The result indicates that all kinds of fractures have negative influences on the mechanical stability of the walls,however,the degrees of the influence is different from each other correspondingly with the types,attitudes,densities,combination patterns and embedding depth of the fractures,and the general rules are follows:the influence degree of horizontal fractures is higher than inclined fractures,and inclined fractures is higher than perpendicular fractures,i.e.,as the dip angle of the fractures increases,the degree of the influence on stability declines;as the number of fractures increases,the degree of the influence on stability declines;as the density of fractures increases,the degree of the influence on stability increases;as the embedding depth increases,the degree of the influence on stability declines.
出处
《西南石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第4期167-170,203,共4页
Journal of Southwest Petroleum University(Science & Technology Edition)
关键词
裂缝
稳定性
井壁
影响
数值分析
fractures
stability
well wall
influence
numerical analysis
