摘要
西南油气田页岩气井复杂压裂套管柱变形严重。根据套变井测井数据,分析确定了三种主要的套变模式和主控因素,量化了复杂压裂工况下地层滑移位移边界(<40 mm),为套变防治提供设计优化依据。依据非常规油气井套管柱模拟试验系统,研究了页岩气井中常用125SGΦ139.7 mm×12.7 mm套管钢级和壁厚的变化对抗剪切和非均匀外挤承载特性的影响规律。研究结果表明,随着套管钢级和壁厚增加,套管抗剪切和抗非均匀外挤承载能力相应增加;高内压循环40次后,套管抗剪切能力降低了50 t,在套管柱设计和评价时应分析承载能力折减的影响。
The complex fracturing casing string of shale gas well in southwest oil and gas field is seriously deformed.With the aid of the well logging data of casing change well,three main casing change modes and main control factors are analyzed and determined.The displacement boundary(<40 mm)of formation slip under complex fracturing conditions is quantified,which provides the basis for design optimization of casing deformation control.Based on the simulation test system of unconventional oil and gas well casing string,the change law of shear resistance and non-uniform collapse resistance characteristics of 125 SGΦ139.7 mm×12.7 mm casing with different steel grades and different wall thicknesses is studied.The results show that the capacity of both shear resistance and collapse resistance of casing increases with the increase of casing steel grades and wall thickness.However,the casing shear resistance capacity decreases by 50 t after 40 times of high internal pressure circulation,the influence of bearing capacity reduction should be analyzed in casing column design and evaluation.
作者
杨尚谕
韩礼红
王建军
王航
潘志勇
YANG Shangyu;HAN Lihong;WANG Jianjun;WANG Hang;PAN Zhiyong(State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials,CNPC Tubular Goods Research Institute,Xi′an,Shaanxi 710077,China)
出处
《石油管材与仪器》
2020年第4期69-72,共4页
Petroleum Tubular Goods & Instruments
基金
中国石油化工联合基金重点项目“页岩气水平井井筒完整性失效机理与控制方法研究”(项目编号:U1762211)
中国石油天然气集团公司科学研究与技术开发项目“页岩气井套管柱应变设计方法研究”(项目编号:2019A-3911)。
