钻井液损害储层室内评价新方法  

A New Method for Reservoir Evaluation of Drilling Fluid Damage in Laboratory

作　　者：孙玉学[1] 季伟 赵景原[1] 李城里 SUN Yu-xue;JI Wei;ZHAO Jing-yuan;LI Cheng-li(College of Petroleum Engineering,Northeast Petroleum University,Daqing Heilongjiang 163318,China)

机构地区：[1]东北石油大学石油工程学院,黑龙江大庆163318

出　　处：《当代化工》2022年第3期561-565,共5页Contemporary Chemical Industry

基　　金：黑龙江省教育厅基金项目(项目编号:No.12521046)。

摘　　要：流动启动压力是影响低渗储层开发的因素之一,实验室用于测量流动启动压力的方法是使用恒定的返排速率,然而实验发现这种方法测得的流动启动压力值偏高。针对这个问题,提出了一种恒定压差的改进返排方法,用钾盐水基钻井液对5种不同渗透率的岩心进行动态滤失后,进行了单相流和两相流返排实验。实验发现,渗透率越高的岩心,流动启动压力越低,并用钻井液损害前后岩心流动驱替实验时稳定压差之比来表示渗透率恢复值,结果发现两相返排实验达到的渗透率恢复值大于单相返排实验,外部滤饼的存在不影响流动启动压力和渗透率恢复值,该方法为储层损害室内评价提供了新思路。Flow start-up pressure is one of the factors affecting the development of low permeability reservoirs. The laboratory method used to measure flow start-up pressure is to use a constant flowback rate, but the experimental results show that the flow start-up pressure measured by this method is too high. To solve this problem, an improved flowback method with constant pressure difference was proposed. After dynamic filtration of cores with five different permeability by potassium water-based drilling fluid, single-phase flow and two-phase flow flowback experiments were carried out. It was found that cores with higher permeability had lower flow starting pressure. The ratio of stable pressure difference during the core flow displacement experiment was used to represent the permeability recovery value. It was found that the permeability recovery value achieved by the two-phase flowback experiment was larger than that achieved by the single-phase flowback experiment, and the existence of external filter cake did not affect the flow starting pressure and permeability recovery value. This method provides a new idea for reservoir damage laboratory evaluation.

关 键 词：储层损害 流动启动压力 渗透率恢复值 钻井液滤失 

分 类 号：TE257[石油与天然气工程—油气井工程]