摘要
水力压裂是一项安全可靠的煤层顶板控制技术。依据水平裂缝扩展机理和液体流动方程,研究了煤矿顶板弹性模量、裂缝滤失系数、压裂液用量、泵注排量、清水、滑溜水和瓜胶液对顶板裂缝尺寸影响规律。清水、滑溜水和瓜胶压裂液产生的裂缝尺寸存在较大差异,具有较高黏度的滑溜水或瓜胶产生的裂缝尺寸较大。清水压裂液在裂缝中滤失量相对较大,产生的裂缝尺寸有限。压裂液用量和泵注排量与裂缝尺寸呈正相关性,影响最明显。在低岩层弹性模量和低裂缝滤失系数顶板中,更易获得尺寸较大的水力裂缝。优化后的水力压裂工艺参数,可有效控制顶板垮落,实现煤矿安全、高效生产。
Hydraulic fracturing is a safe and reliable technology for the control of coal seam roof.Based on the mechanism of radial fracture propagation and the equation of fluid motion,studies the relationships between the fracture size and fracturing parameters,such as the elastic modulus,the fracturing filtration coefficient,the amount of fracturing fluid and the pumping rate.The results show that the size of fractures by clean water,slick water,and guar gum are varied.The slick water and guar gum could produce a larger fracture than the clean water.Due to the great of filtration loss of fresh water,the fracture size is limited.The amount of fracturing fluid and the pumping rate have a positive correlation with fracture size.The elastic modulus and the filtration coefficient also have an effect on the hydraulic fracturing geometry.In the low elastic modulus and filtration coefficient,it is easier to obtain large-scale hydraulic fractures.The optimized hydraulic fracturing process parameters can effectively control the roof collapse and achieve safe and efficient production in coal mines.
作者
曲海
张硕
胡誉双
唐世茂
QU Hai;ZHANG Shuo;HU Yu-shuang;TANG Shi-mao(Chongqing University of Science and Technology,Chongqing 401331,China)
出处
《煤炭技术》
CAS
2020年第10期86-89,共4页
Coal Technology
基金
重庆市教委科学技术研究项目(KJQN201801530,KJQN201901740)
重庆科技学院科技创新项目(YKJCX1820306)。
关键词
控顶
水力压裂
压裂液
裂缝尺寸
数值模拟
roof controlling
hydraulic fracturing
fracturing fluid
fracture size
numerical simulation
