摘要
对苏里格气田西区砂岩、泥岩岩石力学性质的实验研究,获得了储层砂岩、泥岩的抗张强度、静动态弹性模量、静动态泊松比、岩石地应力等力学参数。通过岩石力学参数、地应力、施工排量、缝长等因素对压裂缝高的影响研究表明:随储层与隔层地应力差和岩石断裂韧性增加,压裂缝高呈曲线和直线下降;随着岩石弹性模量和泊松比增加,压裂缝高呈曲线和直线增加;随着施工排量和半缝长增加,压裂缝高呈直线增加。现场应用研究中,根据苏里格气田西区岩石力学和地应力特征及其对压裂缝高的影响,优化了施工排量、加砂规模和半缝长,有效控制了缝高延伸,压裂避开了水层,获得了苏里格气田避水压裂开发的良好效果。
An experimental study on lithomechanical properties of both sandstone and mudstone, west region of Sulige gasfield, is implemented. Many mechanical parameters are gained,including tensile strength, elastic modulus and Poissin's ratio of both static and dynamic states,and in-situ stress. Moreover, the effects of these parameters, construction displacement, and fracture length on induced fracture height are studied. Results show that(1)the induced fracture height appears a linear or curved increase along with an increase of both stress difference between reservoir and its adjoining bed and fracture toughness; and(2)the height emerges a linear increase along with an increase of both construction displacement and half fracture length. According to lithomechanical properties and their effect on induced fracture height, the displacement, sanding size, and half height length are optimized; the fracture-height extension is controlled very effectively, water layer is kept away from fracturing. As a result, a better result of waterless fracturing has been obtained for Sulige gasfield.
出处
《天然气勘探与开发》
2015年第2期51-55,62,共6页
Natural Gas Exploration and Development
关键词
苏里格气田
岩石力学
地应力
压裂
控缝高
避水压裂
Sulige gasfield,lithomechanical,in-situ steer,fracturing,fracture height control,waterless fracturing
