气体钻井地层自然造斜力计算研究  

Calculate Natural Oblique Strength of Formation during Gas Drilling

作　　者：郑锋辉[1,2] 何世明[2] 高如军[2] 迟军[3] 何世云[4] 钟水清[2] 

机构地区：[1]中国石化华北分公司,河南郑州450006 [2]西南石油大学,四川新都610500 [3]中国石油塔里木油田分公司,新疆库尔勒841000 [4]中国石化西南石油局油气测试中心,四川德阳618000

出　　处：《天然气技术》2009年第3期34-36,共3页NATURAL GAS TECHNOLOGY

基　　金：国家自然科学基金项目(编号:50674077);国家高科技研究发展计划(863计划)项目(编号:2006AA09Z312)的资助

摘　　要：气体钻井循环介质为气体,井底压力很小,井底岩石受力状态及对井底钻头及岩石的冷却性能等差异,造成岩石破碎方式与常规钻井液钻井的差异。常规钻井液钻井中地层造斜力的求取与气体钻井必然存在差异。以岩石力学为基础,分析了气体钻井破岩机理,认为气体钻井破岩机理不同于常规钻井液钻井,井底岩石破坏方式为体积破坏;建立了气体钻井地层造斜力的计算模型,实例计算表明该模型可用于气体钻井地层造斜力的求取。Circulating medium is gas during gas drilling and its bottomhole pressure is very low.There is a difference between rock breaking mean and drilling tool used conventional drilling fluid because of some difference from bottomhole-rock enforcing state and its effect on bottomhole bit along with rock cooling property.A variance must be existed in formation oblique strength acquired from conventional drilling-fluid drilling and gas drilling,respectively.This paper analyzes a rock-breaking mechanism for gas drilling according to rock mechanics.It is considered that,the mechanics of gas drilling are different from those of conventional drilling-fluid drilling,and the bottomhole rock damage mean during gas drilling is only volume damage.In addition,this study establishes a model to calculate the formation oblique strength during gas drilling.Case study also illustrates that the model may be applied to the strength acquisition during gas drilling.Moreover,it contributes to a fast drilling without an oblique.

关 键 词：气体钻井 岩石破碎 地层各向异性 地层造斜力 钻井液 

分 类 号：TE21[石油与天然气工程—油气井工程]