射孔对油气井套管抗挤压强度的影响  

Effects of Perforation on the Squeeze Strength of Casings

作　　者：李明厚[1] 朱建新[1] 丁希杰[1] 

机构地区：[1]胜利石油管理局测井公司,山东东营257096

出　　处：《测井技术》2005年第B02期63-67,共5页Well Logging Technology

摘　　要：射孔是导致油水井套管技术性能变差的原因之一。油水井套管在井下承受均匀和非均匀2种形式的挤压载荷。通过对射孔后套管进行非均匀外载挤压试验,研究分析不同孔径、孔密等射孔参数,不同套管壁厚对套管抗挤压强度的影响。结果表明,同种外径的套管,壁厚对抗挤压强度的影响远大于射孔的影响,壁厚越大,强度越大;射孔孔径、孔密对套管抗挤压强度有影响,但射孔前后变化不大;套管承受非均匀外载时抗挤压强度下降较大,且非均匀性越强,下降越大。该文还对射孔段套管损坏的原因进行了分析,对套管防损和射孔参数选择堤出建议,为合理设计套管、选择射孔器以及射孔新技术推广应用提供了指导,以降低射孔对套管产生的损伤。Perforation is one of the main factors that influence the technical performance of casings in oil & water wells. It is known that the casings not only bear homogenous squeeze load but also non-homogenous one. Based on non-homogenous squeeze load of casings after perforation is tested, analysed are the effects of squeeze strength on casings with different entry hole sizes, charge densities and casing thickness. It's indicated that, for the same size of casings, the effects of the casing's thickness on the load are much more than that of perforation, the thicker the casing wall, the greater the strength. EHD and perforating density also influence the strength of casing, but there are minus changes between before-perforation and after-perforation. The reduction of squeeze strength is greater when the casings bear non-homogenous load, the stronger is the non-homogeneity, the more reduction is the strength. The reasons of casing damages in the perforated intervals are analyzed. How to protect casings and select proper perforation parameters are given. How to design casings, select perforator and apply new perforation technique are also proposed, thereby reducing the perforation damages to casings.

关 键 词：射孔 套管损伤 非均匀外载 挤压试验 套管防损 

分 类 号：TE257.1[石油与天然气工程—油气井工程] TE258.1