裂缝地层调整井压力影响因素研究  

RESEARCH ON PRESSURE INFLUENTIAL FACTORS OF ADJUSTMENT WELL IN CREVICED FORMATION

作　　者：周东华[1] 李翠楠[2] 张庆辉 鄢庆辉[2] 

机构地区：[1]西南石油大学 [2]中国石油西南油气田公司 [3]中石油长城钻探工程公司

出　　处：《钻采工艺》2011年第1期39-41,115,共3页Drilling & Production Technology

基　　金：四川省教育厅重点项目"井底恒压钻井理论与控制方法研究"

摘　　要：由于裂缝地层的流体流动具有明显的无规律性,难以给予合理的定量描述。经过多年的开发,长期受不断变化的注、采工作制度的影响,油藏地层压力系统极度紊乱和不均衡,地层孔隙压力分布格局发生了很大变化,原地应力状态也发生了相应变化。地层中出现了压力亏空区和憋压区,而且地层压力时刻动态变化,如果部分区域垂直裂缝及微细缝极为发育。然而,在进行调整井地层压力预测时,油田有关工作人员普遍采用的是基于均质地层假设条件的等压图方法,调整井地层压力难以准确预测。因此,频繁出现的复杂情况严重制约着调整井钻井施工进度,造成钻井成本居高不下。为此,首先利用裂缝网络系统的非均质性和各向异性来研究其渗透特性,给出相应的张量计算表达式,并在此基础之上进行了裂缝网络地层中调整井地层压力的单因素影响分析。For the impact of injection and production in long time, the reservoir pressure systems are extremely disordered and disequilibrium, pore pressure distribution pattern and in situ stress state have changed greatly. When the vertical cracks and micro-slits are well developed, formation appears pressure deficit areas and pressure-out zone, and the formation pressure appears dynamic change. The formation pressure prediction of adjustment well was inaccurate based on the isobaric diagram of homogeneous formation in assumption condition. Therefore, the drilling speed of adjustment well was restricted, resulting in high drilling cost. So, the reservoir permeability was studied by using heterogeneity and anisotropy of crack network system, and the corresponding tensor calculation expression was given.

关 键 词：裂缝地层 调整井 压力分布 地层孔隙压力 地层压力 

分 类 号：TE357[石油与天然气工程—油气田开发工程]