无固相冲洗液防塌护壁性能强化改进试验研究

Experimental study on strengthening and improving the anti-collapse and wall protection performance of solid-free flushing fluid

摘要:

为了改善地质岩心钻探中无固相冲洗液的护壁防塌性能，筛选了脂环类固化剂EPR，脂肪类固化剂DETA、AEP，芳香类固化剂PU，酰胺类固化剂PET共5五种固化剂。利用固化剂可以改进被固化物质的膜硬度、膜附着力、膜耐候性和增加光泽度的特性，向无固相冲洗液中添加固化剂以改善其防塌护壁性能，通过岩心浸泡试验和线性膨胀量试验，确定固化剂EPR和PU具有较好的护壁防塌性能改善作用。然后对EPR和PU进行复配，通过岩心浸泡试验结果得出最优比例为EPR∶PU=1∶4，最后通过线性膨胀量测试和流变性能测试，确定固化剂配方的最优加量为0.2%。确定无固相冲洗液配方为清水+0.5%聚丙烯酰胺+0.04% EPR+0.16% PU，该配方在对冲洗液流变性能影响较小的前提下，改善了冲洗液的护壁防塌性能。

关键词:地质岩心钻探;固化剂;岩心浸泡试验;线性膨胀量试验;防塌护壁性能

Abstract:

In order to improve the wall protection and anti collapse performance of solid-free flushing fluid during geological core drilling， five types of curing agents were selected， including alicyclic curing agent EPR， fatty curing agent DETA， AEP， aromatic curing agent PU， and amide curing agent PET. The use of curing agents can improve the film hardness， adhesion， weather resistance， and increased glossiness of the cured material. Adding curing agents to solid-free flushing fluid can improve the anti collapse performance. Through core immersion tests and linear expansion tests， it was determined that curing agents EPR and PU have a good effect on improving the anti collapse performance of the wall protection. Then， EPR and PU were compounded， and the optimal ratio of EPR∶PU=1∶4 was determined through core soaking test results. Finally， the optimal dosage of curing agent was determined to be 0.2% through linear expansion test and rheological performance test. The dosage of the solid-free flushing fluid is water+0.5% polyacrylamide + 0.04% EPR +0.16% PU， which improves the anti-clapse and wall protection performance with little impact on the rheological property of the flushing fluid.

Key words:geological core drilling;curing agent;core immersion tests;linear expansion tests;anti collapse and wall protection performance