弱凝胶封堵裂缝性能研究  

Research Plugging Performance of Weak Gel to Crack

作　　者：李飞洋[1,2] 李华斌[1,2] 汲国庭 孙千[3] 郭程飞[1,2] 牛忠晓[4] 吴晓峰[1,2] 

机构地区：[1]成都理工大学油气藏地质及开发工程国家重点实验室,成都610059 [2]成都理工大学能源学院,成都610059 [3]西南油气分公司川东北采气厂,阆中637400 [4]华北油田分公司第三采油厂,河间062450

出　　处：《科学技术与工程》2015年第23期28-31,36,共5页Science Technology and Engineering

摘　　要：利用自制全直径岩心夹持器,岩面贴合垫片模拟裂缝,计算选择符合XF油田低渗透天然裂缝及压裂缝的宽度,并研究弱凝胶对缝宽和裂缝形态的封堵效果。驱替试验表明,弱凝胶封堵强度随裂缝宽度的增大而减小,且存在临界裂缝宽度0.69 mm,裂缝小于该值表现为胶体弹性作为封堵主导因素;反之,则为胶体黏性或内摩擦阻力,且其效果不及小裂缝。张裂缝油藏现场调剖时,应充分考虑裂缝宽度的影响,提高调剖剂强度,以增加其弹性能力。缝形实验中,直缝对弱凝胶封堵效果最差,且缝形愈复杂,封堵效果愈好。The width of intrinsic fracture and induced fracture on XF low permeability reservoir were calculated and chosen. Sealing characteristics of weak gel to the width and shape with rock surface bonding pads to simulate crack by homemade full diameter core holder were studied. Displacement tests showed, weak gel sealing character- istics decreases with increasing fracture width, and there is a critical crack width of 0.69 mm. While fracture width less than the critical value, the resilience of weak gel decision to plugging. Conversely, the viscous colloidal or in- ner friction decision to plugging which less than former. Task in place on gash fracture reservoir, operating force should fully consider the impact of crack width to increase its flexibility ability. Shape comparative experiment shows, the worst weak gel plugging is straight seam, and the more complex shape, the better plugging effect.

关 键 词：裂缝宽度 裂缝形态 弱凝胶 封堵性能 

分 类 号：TE39[石油与天然气工程—油气田开发工程]