塔河油田井壁稳定机理与防塌钻井液技术研究

STUDY ON MECHANISM OF WELLBORE STABILITY AND TECHNOLOGY OF ANTI-SLOUGHING DRILLING FLUID IN TAHE OILFIELD

徐加放 邱正松 刘庆来 张红星 于连香

Xu Jiafang Qiu Zhengsong Liu Qinglai Zhang Hongxing Yu Lianxiang

中国石油大学石油工程学院, 山东东营 257061 中石化西北分公司工程监督中心, 新疆轮台 841600

针对塔河油田井壁不稳定地层,选取代表性泥页岩岩心,通过X-射线衍射、扫描电镜、膨胀、分散、比表面积、比亲水量等试验方法,进行了矿物组成、层理结构和理化性能分析,弄清了塔河油田井壁不稳定的主要原因,提出了有效的井壁稳定技术对策,优选出2套防塌钻井液配方。现场试验表明,2套防塌钻井液配方均具有中途转型顺利、维护处理简单、防塌效果突出等优点,使用该钻井液体系可加快钻井速度,节约钻井综合成本。

Because of its deeply embeded, complexity of geologic constructure, coexistence of defferent pressure layers, and so on, there are a lot of severity accident of well bore instability such as collapsing, lost circulation, hinderong and blocking in the formations of Triassic and Carboniferous in Tahe Oilfield. The mechanism of well bore instability was made clear through X-ray diffraction, Scanning Electron Microscope, swelling, shale dispersion, specific surface area and specific water wet amount of shale, analysised the mineral, stratum or stucture and physi-chemical performance on representative shale cones. The effective well bore stability technic-countermeasure were brought for ward, and 2 kinds of anti-sloughing drilling fluids were selected on this bases. The site trial indicate that the 2 kinds of anti-sloughing drilling fluids roll it’s hoop when be transfered in midway, simple in manage and maintenance, and effective in anti-collapsing, quickened the drilling velocity and saved integrated drilling cost.

10.3969/j.issn.1000-7393.2005.04.011