超深高温高压井尾管悬挂器安全性评价新方法  

A new safety assessment method for liner hanger in ultra deep,high-temperature and high-pressure wells

作　　者：谢斌[1] 陈超峰 马都都 练章华[3] 史君林 XIE Bin;CHEN Chaofeng;Ma Dudu;LIAN Zhanghua;SHI Junlin(Engineering Technology Research Institute,PetroChina Xinjiang Oilfield Company,Karamay,Xinjiang 834000,China;Exploration Department,PetroChina Xinjiang Oilfield Company,Karamay,Xinjiang 834000,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China)

机构地区：[1]中国石油新疆油田公司工程技术研究院,新疆维吾尔自治区克拉玛依834000 [2]中国石油新疆油田公司勘探事业部 [3]“油气藏地质及开发工程”国家重点实验室·西南石油大学,四川省都610500

出　　处：《天然气工业》2022年第9期93-101,共9页Natural Gas Industry

基　　金：国家自然科学基金项目“极端条件下气井管柱耦联振动力学行为与控制基础理论研究”(编号:51974271)。

摘　　要：尾管固井完井技术已成为深井、超深井、复杂结构井中不可缺少的完井方式之一,其中评价尾管悬挂器的安全可靠性是井筒完整性的重要内容和难点。为了建立一套适用于深层、超深层高温高压井尾管悬挂器安全性评价方法,以新疆南缘超深高温高压地LX1井尾管悬挂器为研究对象,基于非连续介质的非线性接触问题的有限元原理及其方法,建立了LX1井尾管悬挂器安全性评价方法及其液缸外壁压力预测的有限元新模型。研究结果表明:(1)模型中地层—水泥环、水泥环—套管、套管—水泥环以及水泥环—悬挂器液缸等,其相互界面之间全部用的接触力学有限元模型,边界条件包括地应力、井筒内压以及悬挂器双卡瓦内由下部尾管悬重产生的预拉应力,地层岩石及其水泥石的材料模式采用岩石力学中的DP破坏准则;(2)该模型可以直接获得接触界面之间的接触压力,能够准确和定量模拟计算从地层传递到悬挂器液缸外壁的压力,解决了以前的模型无法直接获得各界面的传递压力问题;(3)该模型评价了极端工况下183 MPa内压下,按API 6X规范的材料第三强度理论应力线性化分类评价方法以及采用应力包络线方法,对LX1井尾管悬挂器评价结果安全,已经在该井应用中得到了验证和应用。结论认为,建立的尾管悬挂器液缸外壁压力随井筒内压变化的新方法,已经在该区的超深井得到了应用,该方法为超深高温高压井评价悬挂器的实际承压能力及其安全性评价提供了简便、可行的计算方法,有力保障了深部高压油气的高效、安全开发。Liner cementing and completion technology has already been one of the indispensable completion technologies for deep wells,ultra deep wells and complex structure wells. And the safety and reliability assessment of liner hanger is the important research content and difficulty of wellbore integrity. In order to establish a set of liner hanger safety assessment method applicable to deep, ultra-deep, hightemperature and high-pressure wells, this paper takes the liner hanger of Well LX 1 with great depth, high temperature and high pressure in the southern flank of Xinjiang as the research object to establish a new finite element model for assessing the safety of liner hanger and predicting the outer wall pressure of its hydraulic cylinder in Well LX 1 based on the finite element principle and method of nonlinear contact problem of discontinuous medium. And the following research results are obtained. First, the finite element model of contact mechanics is used for all interfaces between formation and cement sheath, cement sheath and casing, casing and cement sheath, and cement sheath and hanger hydraulic cylinder. The boundary conditions include in-situ stress, wellbore internal pressure and pretension stress generated by the hanging weight of the lower liner in the double slip of the hanger. The DP failure criterion of rock mechanics is adopted in the material model of formation rock and its set cement. Second, this model can directly obtain the contact pressure between contact interfaces and accurately and quantitatively simulate the pressure transmitted from the formation to the outer wall of the hanger hydraulic cylinder, which solves the problem that the previous model can not directly obtain the transmission pressure of each interface. Third, this model evaluates the safety of the liner hanger in Well LX 1 under extreme working conditions with an internal pressure of 183MPa using the stress linearization classification evaluation method of the third strength theory of API standard 6Xand the stress envelope metho

关 键 词：超深高温高压井 尾管悬挂器 有限元分析 安全性评价 液缸外壁压力预测 力学强度 

分 类 号：TE925.2[石油与天然气工程—石油机械设备]