扶正器安放设计与套管居中度分析  

Installation Design of Centralizers and Analysis of Casing Central Degree

作　　者：郑睿 江乐 杨晨 李勇 李炜[3] 周士杰 Zheng Rui;Jiang Le;Yang Chen;Li Yong;Li Wei;Zhou Shijie(CNPC Engineering Technology R&D Company Limited;Changqing Well Cementing Company,CNPC Chuanqing Drilling Engineering Company Limited;PetroChina Tarim Oilfield Company;Jianghan Machinery Research Institute Limited Company of CNPC)

机构地区：[1]中国石油集团工程技术研究院有限公司 [2]中国石油集团川庆钻探工程有限公司长庆固井公司 [3]中国石油塔里木油田分公司 [4]中石油江汉机械研究所有限公司

出　　处：《石油机械》2021年第1期35-40,共6页China Petroleum Machinery

基　　金：国家科技重大专项“提高大型体积压裂条件下固井质量与井筒完整性新技术”(2016ZX05022005);中国石油天然气集团有限公司重大工程专项“固井设计仿真监控系统升级与关键技术研发”(2018E-2103)。

摘　　要：套管居中程度对固井质量影响很大,合理设计扶正器安放位置有利于提高套管居中度。为此,首先建立了套管居中度的数学模型,用于计算扶正器处和扶正器间套管的居中度,然后分析了井斜角、安放间距和套管内外液体密度差对套管居中度的影响规律。研究结果表明:随着井斜角的增大,套管居中度降低;扶正器间距的增加会增大井斜角对居中度的影响;随着扶正器外径的增大,套管居中度提高;随着套管内外液体密度差异的增大,套管居中度提高;井斜角越大,套管内外液体密度差产生的浮力对居中度的改善作用越明显。最后利用C#程序语言编制了扶正器安放设计与套管居中度分析软件。用该软件对磨溪-X井进行扶正器安放设计,三开4285~4614 m井段共需安放24个刚性扶正器,居中度满足67%的要求;对塔里木油田固探-X井进行居中度分析,模拟数据与实测数据的平均误差为14.14%。研究结果对于大斜度井固井质量的提高具有重要意义。Casing central degree has a great influence on cementing quality,and designing the installation position of centralizer reasonably is favorable to increase casing central degree.In this paper,the mathematical model of casing central degree is established to calculate the casing central degree at the position of centralizer and between centralizers.Then,the influence laws of hole deviation angle,installation spacing and fluid density difference between inside and outside the casing are analyzed.The results show that casing central degree decreases with the increase of hole deviation angle.The influence of hole deviation angle on central degree increases with the increase of centralizer spacing.Casing central degree increases with the increase of centralizer OD.Casing central degree increases with the increase of the fluid density difference between inside and outside the casing.The larger the hole deviation angle is,the more greatly the central degree is improved by the buoyancy force generated due to the fluid density difference between inside and outside the casing.Finally,the software for the installation design of centralizers and the analysis of casing central degree is developed by using C#language.This software is applied to the installation design of centralizers in Well Moxi-X.24 rigid centralizers are totally needed in the third section from 4,285 m to 4,614 m,which satisfies the required central degree of 67%.And it is also used to analyze the central degree of Well Gutan-X in Tarim Oilfield.The average error between the simulation result and the measurement data is 14.14%.The research results are of important significance to improve the cementing quality of highly deviated wells.

关 键 词：套管扶正器 居中度 井斜角 安放间距 C#语言 

分 类 号：TE925[石油与天然气工程—石油机械设备]