基于三维模型的开窗侧钻水泥环胶结强度分析  

Analysis of Cementing Strength of Sidetracking Cement Sheath Based on 3D Model

作　　者：欧阳勇[1,2] 申昭熙 白明娜[1,2] 段志锋[1,2] 丁宇奇[5] Ouyang Yong;Shen Zhaoxi;Bai Mingna;Duan Zhifeng;Ding Yuqi(Oil and Gas Technology Research Institute,Changqing Oilfield Company,PetroChina;National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields;CNPC Tubular Goods Research Institute;National Key Laboratory of Service Behavior and Structural Safety for Petroleum Tubular and Equipment Materials;College of Mechanical Science and Engineering,Northeast Petroleum University)

机构地区：[1]中国石油长庆油田公司油气工艺研究院 [2]低渗透油气田勘探开发国家工程实验室 [3]中国石油集团石油管工程技术研究院 [4]石油管材及装备材料服役行为与结构安全国家重点实验室 [5]东北石油大学机械科学与工程学院

出　　处：《石油机械》2022年第5期16-23,31,共9页China Petroleum Machinery

基　　金：中国石油重大科技专项“侧钻井示范与推广”(2019D-4209);黑龙江省博士后基金项目(LBH-Q20082)。

摘　　要：在老井开窗侧钻过程中,钻头会破坏原有套管和水泥环结构,同时开窗位置附近的第一、第二胶结面胶结强度也会变化,胶结强度的下降将直接影响开窗侧钻的安全进行。为了保证开窗侧钻的安全进行,以开窗侧钻老井为研究对象,采用有限元方法建立了套管-水泥环-地层三维模型,分析了开窗侧钻过程中水泥环胶结强度变化情况。计算结果显示:开窗侧钻后第一胶结面的失效区域为开窗侧钻点上方1.60 m到下方4.00 m,其中开窗侧钻点上方0.20 m到1.65 m下方之间的胶结面环向完全失效;水泥环的失效区域为开窗侧钻点上方1.80 m到下方3.95 m,第二胶结面的失效区域为开窗侧钻点上方1.90 m到下方4.10 m。通过对轴向和环向胶结强度的分析可以得到开窗侧钻过程中胶结面的胶结强度变化规律,从而使新套管悬挂位置更加经济和安全。During sidetracking in old wells,the drill bit may destroy existing casings and cement sheaths,and meanwhile,the cementing strength of the first and second cementing surfaces near the window will be decreased,which will affect the safety of sidetracking directly.In order to ensure the practice safety,taking a sidetracking old well as the study object,a 3 D model of casing-cement sheath-formation was established by use of the finite element method to analyze the variation of cementing strength of cement sheaths during sidetracking.The calculation results show that,after sidetracking,the failure area for the first cementing surface is from 1.60 m above the sidetracking point to 4.00 m below the sidetracking point,in which the cementing surface between 0.20 m above the sidetracking point and 1.65 m below the sidetracking point fails completely in circumferential direction.The failure area for cement sheaths ranges from 1.80 m above the sidetracking point to 3.95 m below the sidetracking point,and the failure area for the second cementing surface ranges from 1.90 m above the sidetracking point to 4.10 m below the sidetracking point.

关 键 词：开窗侧钻 胶结面 胶结强度 水泥环失效 悬挂位置 

分 类 号：TE357[石油与天然气工程—油气田开发工程]