摘要
致密砂岩气藏是非常重要的非常规油气资源,其储层致密、孔喉细小、黏土改造作用强、强亲水且原始水饱和度低;采用钻井液钻开储层可能造成较为严重损害,且难以解除,严重影响气井产能。气体钻井是保护该类储气层的最有效技术,可以获得高的产能。我国在应用该技术开发致密砂岩气藏中取得较好的效果,但是部分井的效果差,甚至发生井下复杂情况。由于断层、透镜体和裂缝的作用使得气藏非均质性强,为充分发挥气体钻井的优势,应开展气藏精细描述,综合分析储层发育的主控因素,建立高渗富集区分布模式,优选井位和井身轨迹,这是气井高产稳产的物质基础。由于气体钻井与常规钻井有较大差异,需要做好气体钻井的工程可行性论证,气体钻井和完井一体化设计来实现有效保护气层且投产快;并根据其技术特点加强现场组织实施工作,以达到在安全顺利条件下获得高产气量。
Tight sandstone gas reservoir is a very important unconventional petroleum resource.Its characteristics are tight rock,small pore-throat,powerful reforming effects of clay minerals,strong water wettability and low initial water saturation.It is badly damaged and restored difficultly when the reservoir is drilled by drilling fluid,gas well productivity is reduced greatly.Gas drilling is an effective technique of formation damage control,high productivity and good effect are gotten in development of tight sandstone gas reservoir by this technique in China,but the results of some wells are bad,and downhole complex problems are taken place.Tight sandstone gas reservoir has strong nonuniformity,in order to full bring into play the advantage of gas drilling,the fine description of gas reservoir was done,the main controlling factors of reservoir must be analyzed synthetically,the distribution pattern of high permeability and abundance zone is established,well location and wellbore trajectory are optimized,all these are the material base of high productivity well.Because there is defect in gas drilling,and the argumentation of gas drilling engineering feasibility must be done.In order to control formation damage and put into production quickly,the design of gas drilling and well completion was make up integration;and the management and operation of field test were strengthened according to the technic characteristic of gas drilling,thus the high productivity of gas well was achieved.
出处
《钻采工艺》
CAS
北大核心
2009年第4期5-7,共3页
Drilling & Production Technology
关键词
致密砂岩气藏
气体钻井
非均质性
高渗富集带
工程可行性
tight sandstone gas reservoir,gas drilling,heterogeneity,high permeability abundance zone,engineering feasibility
