顶部注水泥工艺在东胜气田多层开发中的首次应用  

Top cementing technology and its first application to multi-layer development in Dongsheng gasfield

作　　者：张辉[1] Zhang Hui(Petroleum Engineering Technology Research Institute,Sinopec North E&P Company,Zhengzhou,Henan 450006,China)

机构地区：[1]中国石化华北油气分公司石油工程技术研究院,河南郑州450006

出　　处：《天然气技术与经济》2020年第4期41-45,共5页Natural Gas Technology and Economy

基　　金：国家科技重大专项“低丰度致密低渗油气藏开发关键技术”(编号:2016ZX05048);国家科技重大专项“中西部盆地页岩油勘探开发目标评价”(编号:2017ZX05049)。

摘　　要：为了充分认识顶部注水泥工艺在垂向不同类型气藏开发应用的可行性,以具有代表性的鄂尔多斯盆地东胜气田上古生界含水气藏和元古界裂缝性气藏为研究对象,分析了固井难点、双封隔器管串结构及正注反挤固井工艺设计,首次在东胜气田定向井开展了Φ139.7 mm顶部固井试验评价。研究结果表明:①锦142井顶部注水泥工艺保障了元古界裂缝性气藏筛管完井无水泥污染及上古生界含水气藏的固井有效封固;②顶部注水泥工艺是在同一井径条件下建立分层多样完井方式的重要手段,可以实现垂向多层精细化动用;③采用双封隔器管串结构设计,优选井径规则且井壁稳定性地层作为安放位置,有效防止了水泥浆下落;④正注反挤固井工艺有利于提升垂向多层恶性漏失井的固井质量。结论认为,顶部注水泥工艺简化了井身结构,节约了成本,避免了水泥浆污染气层,为国内垂向不同类型致密气藏高效开发提供了借鉴。In order to sufficiently clarify the feasibility of applying the top cementing technology to vertically diverse gas reservoirs,some cementing difficulties,twin-packer pipe string structure,and cementing design of positive injection&reverse squeezing were analyzed by taking the Upper Paleozoic water-bearing gas reservoirs and the Proterozoic fractured gas reservoirs in Dongsheng gasfield,Ordos Basin,as objectives.In addition,Φ139.7-mm top cementing was tested and evaluated in many directional wells for the first time.Results show that(1)an application of top cementing technology to Jin 142 well ensures the screen completion without cement contamination in the Proterozoic fractured gas reservoirs and the effective cementing in the Upper Paleozoic water-bearing gas reservoirs;(2)this technology is an important means to form many layered and diverse completion modes under the same borehole diameter,so as to realize fine multi-layer production in vertical direction;(3)cement slurry can be effectively prevented from dropping via adopting the design of twin-packer pipe string structure and selecting one formation with regular borehole diameter and stable borehole wall as the setting position;and(4)the cementing technology of positive injection&reverse squeezing is beneficial to improve the cementing quality for those wells with multiple serious leakage layers in the vertical direction.In conclusion,it can simpli⁃fy the casing program,save the cost,and prevent the cement slurry from contaminating gas layers.The research result provides reference for the efficient development of domestic vertically diverse tight gas reservoirs.

关 键 词：顶部注水泥工艺 水力扩张式封隔器 正注反挤 鄂尔多斯盆地 车胜气田 上古生界含水气藏 古元界裂缝性气藏 

分 类 号：TE37[石油与天然气工程—油气田开发工程]