页岩气水平井生产套管变形机理及工程应对方案——以昭通国家级页岩气示范区黄金坝区块为例

发布时间：2018-01-11 12:03

本文关键词：页岩气水平井生产套管变形机理及工程应对方案——以昭通国家级页岩气示范区黄金坝区块为例　出处：《天然气工业》2017年11期 　论文类型：期刊论文

【摘要】：针对四川盆地周缘昭通国家级页岩气示范区黄金坝区块2口页岩气水平井套管严重变形的情况,基于24臂井径套管变形测量、裸眼井径、电阻率电测、钻时及气测录井、固井CBL/VDL及CBL成像等资料,分析引起套管变形位置附近地层的地质与工程特征,利用三维成像分析软件分析24臂井径测量数据并进行三维成像,得到了变形套管的形态特征。研究结果表明:(1)极严重套管变形井段发生在构造裂缝发育区;(2)套管变形形态为上下方向为主的"S"形弯曲;(3)极严重套管变形呈现明显的遭受岩石高角度滑移挤压而横向剪切变形特征。据此提出建议:(1)该区应重点防范由岩石沿裂缝面滑移引起的剪切套管变形,利用产层段构造等值线图,设计井眼轨迹避开地下局部高陡构造的"脊部"或"谷底"位置;(2)利用产层段蚂蚁体分布图预测的裂缝带分布信息,使井眼轨迹沿裂缝带走向钻进;(3)推荐采用免钻磨大通径桥塞或全通径无限级完井工艺技术,避开压裂后常规桥塞钻磨工序,以确保压裂后的各级压裂层都能投产。
[Abstract]:Aiming at the serious casing deformation of 2 shale gas horizontal wells in Jinba block of Zhaotong National Shale Gas demonstration area in the margin of Sichuan Basin, based on 24 arm casing deformation measurement, open hole diameter and electrical resistivity survey. Drilling time and gas logging, cementing CBL/VDL and CBL imaging data are used to analyze the geological and engineering characteristics of the strata near the casing deformation position. Three-dimensional imaging analysis software was used to analyze 24 arm diameter measurement data and 3D imaging. The morphological characteristics of the deformed casing are obtained. The results show that the extremely serious casing deformed well section occurs in the area of structural fracture development. (2) the casing deformation is "S" shape bending in the upper and lower directions; (3) the extremely serious casing deformation shows obvious characteristics of lateral shear deformation caused by high angle slip of rock. In this area, the shear casing deformation caused by the slip of rock along the fracture surface should be avoided. The well trajectory is designed to avoid the "ridge" or "valley bottom" position of the local high and steep structure by using the isoline map of the production section. 2) making use of the distribution information of the fracture zone predicted by the distribution map of the ant body in the production section, the well trajectory can be drilled along the strike of the fracture zone; In order to ensure that all fracturing layers after fracturing can be put into production, it is recommended that the drilling and grinding process of Datong diameter bridge plug or full diameter infinite grade completion technology should be adopted to avoid the conventional bridge plug drilling and grinding process after fracturing in order to ensure that all fracturing layers after fracturing can be put into production.
【作者单位】：斯伦贝谢(中国)公司;中国石油浙江油田公司;西南石油大学;
【分类号】：TE358
【正文快照】： 0引言中国石油浙江油田公司承建的昭通黄金坝区块页岩气国家级示范区建设的生产井采用三开水平井井身结构,?139.7 mm套管作为生产套管,套管内径为115 mm,而分层压裂泵送桥塞外径108mm。部分井两级压裂之间桥塞泵送或全部压裂结束后,桥塞钻磨期间出现过套管变形引起作业工具阻

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