摘要
利用水渗流模拟实验装置进行了压差与固井质量的关系，储层物性（主要是渗透率）、储层渗流速度与固井质量的关系等实验研究。结合现场调查和统计规律得出，高压层固井环空压差大于１ＭＰａ、低压层固井环空压差小于９０ＭＰａ的情况下，用Ａ级水泥原浆能够保证固井质量。在密井网条件下，水渗流流速在钻井固井过程中应控制小于１２０ｍ／ｄ，大于１２０ｍ／ｄ地层流体的水渗流将对固井声幅质量检测造成影响。提出了地层中水渗流主要影响水泥的溶解结晶机理，对局部化学反应影响较小。地层流体渗流损害水泥环胶结质量的机理是溶解迁移机理，水渗流通过改变溶解速率和迁移速率来影响水泥环的胶结质量，其溶解速率由迁移速率所决定。
Experiment has been
carried out to study the relationship between differential pressure and cementing
quality,between the physical properties of the reservoir(mainly of permeability),osmosis
velocity and cementing quality etc..With investigation and statistics on the well site,grade A
cment can enssure cementing quality if a layer of high pressure formation is cemented with
annular pressure difference above 1 MPa,a layer of low pressure formation is cemented with
annular pressure below 9 0MPa.For dense well pattern,osmotic velocity should be controlled
below 1 20m/d while cementing,otherwise will affect CBL (cement bonding
logging).Meanwhile,this paper has also studied the dissolving and crystallizing mechanism of
cement affected by the seepage of formation fluid,and the seepage has a little effect on local
chemical reaction.The mechanism of formation fluid damaging cementing quality is changing
dissolving velocity and migration velocity,and dissolving velocity depends on migration
velocity.
出处
《钻采工艺》
CAS
1999年第2期4-8,共5页
Drilling & Production Technology
关键词
固井
压差
水渗流
模拟
钻井泥浆
胶结
geology,well cementing,differential pressure,water percolation,acoustic
amplitude,laboratory testing
