水平层状裂缝性岩体的井壁稳定性分析  

Wellbore Stability Analysis for Horizontal Stratified Fractured Rock

作　　者：李士斌[1] 高铭泽[1] 

机构地区：[1]大庆石油学院提高采收率教育部重点实验室,黑龙江大庆163318

出　　处：《石油钻探技术》2009年第2期35-37,共3页Petroleum Drilling Techniques

摘　　要：在一些钻井工程实践中,常会遇到水平层状裂缝性岩体的井壁稳定问题。因此,了解该类岩体的强度特征及其大小,建立相关的强度模型,对于正确判断和处理工程中出现的水平层状裂缝性岩体的井壁失稳是非常有益的。分析了水平层状裂缝性岩体的应力和应变情况,建立了水平层状裂缝性岩体交界面处的抗压强度模型。利用该模型,结合大庆油田徐家围子地区部分井段水平层状裂缝性岩体的井壁稳定性较差,井壁坍塌、掉块严重的特点,以室内试验为基础,确定了该井段水平层状裂缝性岩体的合理坍塌压力,为该地区井壁稳定提供了保障。During drilling operations, the wellbore sloughing occurred often in horizontal stratified fractured rock. Therefore, it is useful to develop strength model to analyze such formation to identify wellbore sloughing caused by horizontal stratified rock and to take proper measurements. This paper analyses stress and strain in horizontal stratified fracture rock and a compression model for compressive strength of interfaces of horizontal stratified rock was created. Considering well problems in Xujiaweizi, Daqing Oilfield, including wellbore instability, wells collapse, and the serious swap block, a reasonable collapse pressure was determined for horizontal stratified rock based on laboratory experiments. This ensures the wellbore stability in this block.

关 键 词：裂缝性岩体 抗压强度 坍塌压力 井眼稳定 大庆油田 

分 类 号：TE21[石油与天然气工程—油气井工程]