摘要
煤层气井径扩大不仅影响固井质量,而且会严重影响排采.以煤体变形程度不一的焦作煤田恩村井田为例,根据煤岩典型测井响应曲线,以0.5m煤层厚度为间隔采集测井曲线值,结合钻井取芯,划分出I类、Ⅱ类煤和Ⅲ-Ⅳ类煤的厚度,进而划分出煤体结构组合,应用回归分析方法得出煤体结构组合与井径变化关系.结果表明:煤体结构以I类和Ⅱ类煤为主时,井径变化率较小,扩径较小;当4类煤体结构均含有,所占比例相当时,煤层稳定性较差,井径扩径较大,井径变化率较复杂;煤体结构以Ⅲ-Ⅳ类为主时,井径扩径严重,此类煤体结构组合对井身质量影响最大.
The coal-bed methane well is expanded directly,which is not only impact on the cementing quality,but also seriously pollute the coal reservoir and ultimately affect the production of coal-bed methane.Based on the data of the well logging response curve and different deformation degree of the coal in Encun mining field of Jiaozuo,and with the 0.5m coal seam thickness interval,the thickness of Ⅰ,Ⅱ type and Ⅲ-Ⅳ type coal structure in all wells is divided.With the coal structure combination,the relation between the coal structure combination and the change in well diameter is obtained by the regression analysis methods.The results indicated：when the coal structure dominated by I and Ⅱ type,the rate of well diameter change and the expanding of well diameter are all small;when the coal structure dominated by all of them and contain average proportions,the stability of coal-bed is poor,the expanding of well diameter is larger,the rate of well diameter change is complicated.when the coal structure dominated by Ⅲ-Ⅳ type,the expanding of well diameter is serious,this coal structure combination have larger influence on the quality of wells.
出处
《河南理工大学学报（自然科学版）》
CAS
2010年第2期162-166,共5页
Journal of Henan Polytechnic University（Natural Science）
基金
河南省科技基础与前沿项目(092300410213)
河南理工大学博士基金资助项目(B2009-51)
关键词
测井曲线
煤体结构
井径扩径
井径变化率
well logging curve
coal structure combination
expanding of well diameter
rate of well diameter change
