Daqing Xingbei Development Area Of Transition Zone, Ⅰ～Ⅱ, Interlayer Casing Failure Mechanism Research

The casing damage wells of oil wells production lost ability, causing the overall development pattern, which led to the implementation of the stable production of crude oil and that of the oil field development plan, development form and efficiency has also been seriously affected. The transition in Xingbei development area of Daqing oilfield with SA I ~ II dissection of casing failure in recent years, the location of casing damage has not been effectively controlled, the number of casing damage wells increased year by year, the casing damage situation has become worse and worse. In order to curb the transition zone in SA I ~ II dissection in casing failure to understand transition zone in SA I ~ II dissection and tender second section at the bottom of the lithological features of the influence of the casing, and transition zone area and pure oil tender second paragraph at the bottom of the lithologic characteristic difference and influence on casing damage.At present, the domestic research mainly focuses on the set of description and statistical analysis the damage characteristics, in the oil range, the real meaning of the research on casing damage mechanism is a tender two casing failure mechanism research. Since 2004 no longer casing systematic theory, formation of casing damage,dissections in casing damage is not made open the topic, especially transitional zone of Sa I-and SA II dissection piece set loss research, within the scope of the Songliao basin is still blank. According to the casing damage status and interlayer section of casing damage is more and more serious, but the interlayer section of geological features,lithologic features, laminated segments and development and engineering, interlayer section of casing damage mechanism is not clear, which not only in the domestic,abroad also no example can say interlayer section casing damage mechanism research is a new field of study on casing damage.The casing geological model and shear mechanical model according to the analysis, the mechanical process of SA I ~ SA II dissection occurred casing. Initiated by the application of casing damage development factors and engineering factors analysis technology, establish caused the mechanical mechanism of casing damage and mechanical model, analysis and studied the transitional zone of SA I ~ SA II dissection in casing failure research and clarify the casing damage mechanism and preventionmeasures, the transition zone effectively casing damage prevention and control work to lay the foundation.