随钻地层压力测量模拟实验研究

SIMULATION STUDY ON FORMATION PRESSURE MEASUREMENT WHILE DRILLING

与传统技术相比,随钻地层压力测试工具测量的地层压力数据能更好地反映地层的真实压力状况,据此可优化钻井工艺、提高钻井效率。根据地层压力数据确定的压力梯度和流体界面等信息,进行井眼导向,实时调整泥浆密度,及时识别和发现一些复杂的钻井地质环境因素。本文从FRA理论分析入手,利用地面模拟实验平台(地层液体抽吸组合测量装置)对4块不同尺寸、不同孔隙度和渗透率的砂岩岩心进行模拟地层液体抽吸实验,通过解释程序得出4块岩心的压力—时间关系图并预测地层压力。

Compared with traditional technology,the data measured by the formation pressure testing tool can reflect the real pressure of formation better.Therefore it can optimize drilling technology and improve drilling efficiency.The pressure gradient and fluid interface determined by the formation pressure data can help borehole steering,real-time regulation of mud density,identification and discovery of some complex drilling geological environment.From FRA theoretical analysis,simulation experiments are carried out to 4 sandstone cores of different size,different proosity and permeability with the ground simulation experiment platform(formation liquid pumping multiple measurement devic).Pressure-time diagram is arrived with which formation pressure can be predicted.