水敏性泥页岩地层与钻井液接触时水化能力的实验研究

Experimental Study of Hydratability of Water Sensitive Shale Formation in Contact with Drilling Fluid

地层与泥浆组成体系的扩散吸附常数及井眼围岩吸附水增量分布是水敏性泥岩地层井壁稳定性研究所需的重要参数，其影响因素相当复杂，很难通过室内简单实验进行测定。本文从室内长岩心岩电流动实验出发，对利用测井参数确定扩散吸附常数及井眼围岩吸附水增量分布的方法进行了研究，结果表明通过对静滤失状态下侵入方向电阻率剖面的定量分析，可以使扩散吸附常数及井眼围岩吸附水增量分布得到唯一确定。

The diffusion-absorption constant of the system composed of shale formation and mud, and the absorbed water incremental distribution at any time are significant parameters for studying wellface stability in shale formation. Its influence factors are quite complicated and therefore, are difficult to determine through simple laboratory experiment. Starting from the rock current experiment of the laboratory long core, this paper makes a research on the method of using log information to determine deffusion-absorption constant and absorbed water incremental distribution. The conclusions of the research indicate that diffusion-absorption constant and absorbed water incremental distribution can be determined solely through quantitative analysis of rexistivity profile of invasion zone in the state of static filtration.