Analysis of casing equivalent collapse resistance in creep formations 蠕變地層套管等效破壞載荷分析
It can lead to not only quick wear and early failure of drill pipe but also the decrease of collapse resistance and burst resistance of casing string , which could cause casing collapse , casing deformation and casing leak , even well bore abandonment 其直接后果是:鉆柱快速磨損,導(dǎo)致過早失效;套管磨損會降低套管柱的抗擠強(qiáng)度和抗內(nèi)壓強(qiáng)度,造成套管柱擠毀、變形及泄漏,嚴(yán)重時造成全井報廢。
The research suggests that the failure process of the multi - ribbed composite walls under horizontal seismic loads is : the cracks of the infilled silicate bricks and the cracks of the inner rib beams and rib columns - the cracks of the outer frames ; and that the walls can release energy by stages , showing perfect capacities of energy dissipation and collapse resistance 研究表明:復(fù)合墻板在水平地震力作用下,其破壞過程按“填充砌塊?肋梁肋柱?外框架”的順序進(jìn)行,分級釋放能量;試驗中墻板大部分發(fā)生剪切滑移破壞;墻板的平均抗剪承載力、延性指標(biāo)、耗能及抗倒塌能力明顯優(yōu)于組合磚墻。