钻井液滤失造壁性能评价方法研究现状

介绍了现有钻井液泥饼渗流特性、孔喉大小、厚度及压缩性等质量参数的评价、仪器及其评价方法,并分析了扫描电镜、能谱仪等仪器设备在泥饼微观结构及组分分布特征表征方面的研究与应用现状。现有研究思路侧重于对样品表面形貌的观测,在优化钻井液滤失造壁性能时仍然缺乏对泥饼内部微观结构的基础性认识,未来应继续深入开展对钻井液泥饼微观结构空间分布特征方面的研究分析,进一步弄清钻井液降滤失作用机理及降低钻井液滤失量的途径,发展并完善钻井液滤失造壁性调控机理基础理论,为新型高效处理剂的研制以及钻井液技术水平的提升提供指导和技术支撑。 

Development of Polyester Gel Strength Enhancer and High Density Oil Base Drilling Fluid

A high performance gel strength enhancer was developed for use in oil base drilling fluids to improve their suspension capacity.The enhancer is a polyester made from a high purity dimeric dibasic acid and a polyoxyethylene fatty amine(EthomeenC25).The molecules of the gel strength enhancer have flexible backbones and groups of strong polarity, which enable the molecules to form steric networks.The gel strength enhancer effectively improves the low shear rate rheology and gel strengths of oil base drilling fluids.LSYP of drilling fluid is incresed from 0.51 Pa to 3.07 Pa, gel strength is improved from 1.5/2.5 Pa/Pa to 5.0/7.5 Pa/Pa.High density oil base drilling fluid has been formulated with this gel strength enhancer, and the properties of the drilling fluid tested.The drilling fluid has good basic properties and high gel strengths, and has good suspension capacity even after hot rolling at 180℃.