基于SEM的ISS钻井液固化特性试验研究  

Experimental study on solidification characteristics of ISS drilling fluid based on SEM

作　　者：张沛远 朱俊霖[1] 

机构地区：[1]中南大学地球科学与信息物理学院,湖南长沙410083

出　　处：《世界有色金属》2017年第13期278-281,共4页World Nonferrous Metals

摘　　要：页岩气储层渗透率低、水敏性强、易水化膨胀,导致储层结构容易破坏,产量衰竭加快,加之我国页岩气储层地质结构复杂,长水平段钻井中容易发生井漏、井塌、缩颈及地层污染等多种问题。ISS目前已广泛应用于我国水利、公路等领域,使土强度提高,易于压实,结构稳定,但是还未能有效应用于页岩气储层改造中。考虑到页岩气钻井钻进过程中产生大量粒径不等的炭质页岩岩粉,在钻井液作用下,将形成以炭质页岩岩粉和钻井液组成为主要成分的泥饼,可以起到降失水和护壁作用,设计并进行了模拟失水量测定实验,结果表明岩粉的粒径级配、含量浓度和外压对泥饼的性质有不同程度的影响,但是总体降滤失性能还不足以满足生产需求。通过对泥饼进行SEM扫描电镜分析,探究泥饼微观结构和ISS的作用效果和机制,并在此基础上提出一种基于ISS的固化泥浆体系,进行失水量实验,证明该固化剂泥浆可对储层起到有效的固化护壁作用。Shale gas reservoir is easy to be destroyed when extracted because of low permeability,strong water sensitivity and strong hydration swelling.As a result,there are many problems such as well leakage,collapse,necking and formation pollution in long horizontal section station.In recent years,ISS is widely applied in water conservancy project and road construction with a good effect,however,it hasn＇t been effectively applied to the transformation of shale gas reservoirs.A large number of different sizes of carbonaceous shale powder will come out in the process of drilling and they will form mud cake with composition of drilling fluid.To simulate this situation,we designed water loss tests with carbonaceous shale powder in different conditions.Then we take SEM electron microscope analysis of mud cake to observe the micro-structure to explore the mechanism of ISS action.Based on the results,we propose a slurry system based on ISS and it can effectively reduce the loss of water to protect the reservoir.

关 键 词：ISS 炭质页岩 井壁稳定性 失水量 细观结构 

分 类 号：X741[环境科学与工程—环境工程]