Resear The Relationgs Of Nen II Formation Standard Tablet Casing Damage With Geological Features Of North Xingshugang Oil Field

In this article the development trend of the casing damaged in large adjacent area in oil-shale and the characteristics,the status in quo of it are analyzed. The reason that causing casing damage in large adjacent area is that the bad cement job quality result in pervasion of injecting water along the channel in the oil-shale bedding of the bottom of formation N2. The water pervasion area is increasing and the crustal stress causes the sliding of formation which subsequently results in the shear casing damage. The characteristic of it is that the casing damage area will increase very quickly since the first casing damage well is found and will result in severe harm in oil development.Through the analysis on core,the damage depth of the casing derived from the 2.5M resistivity curve and multi-arms caliper curve and the semi–quantitative knowledge on water pervasion, deep understanding on the casing damage are got. The exact position of casing damage can be determined at the interface of the third and fourth peak of the oil-shale.Base on this, technics of prevention and cure of casing damage are studied and the speed of casing damage is controlled to some extent. The influence of the casing damage to oil development is reduced.