Inhibitive ability annraisal of salt solution on coal rock
Abstract：Employing a lot of lab tests, this paper investigated the impact of salt solution on the expansibility, the roller recovery rate and the permeability of coal rock samples collected from No. 3 coal seam in Jincheng. The impact of salt solution on drill pipe＇ s corrosivity was also investigated. Here salt solution includes various types of salt such as NaC1, KC1, CaC12, HCOONa and HCOOK with the concentration varies as 5% , 10% and 20 %. The results show that ： firstly, fresh water can bring formation damage to gas bearing coal seam when it is used as drilling fluid in coal seams with a high content of clay minerals;furthermore, in presence of salt solution, adsorption and swelling of coal rock matrix can be restrained and even the matrix can shrink, increase of weight percent results in better inhibitive performance when same type of salt is used;finally, with the integrative consideration on technology feasibility and economic cost, HCOONa and HCOOK have better inhibitive performances and lower corrosivity compared with other salts and the optimal concentration are 10%.
Keywords：salt solutioncoal rockinhibitive abilityexpansibilityroller recovery ratepermeabilitycorrosivity
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 951-956 )