摘要
吐哈气田属于低孔低渗透凝析气田,地质构造复杂,气层埋藏深,地层压力与露点压力的差值较小,气井的产能相对较低,且稳产能力较差。从沉积环境、地层系数、气井表皮系数、反凝析堵塞、近井地带反渗吸水锁、压裂改造和产水等7个方面对影响吐哈气田凝析气井产能的因素进行了评价,认为有利的储层沉积微相带、较大的地层系数和压裂改造有利于提高气井的产能,而较高的表皮系数、反凝析污染、产水会导致气井产能降低。在此基础上,利用多元回归法提出了预测吐哈气田气井产能预测的新方法,并将该方法实际运用于研究区凝析气井,计算的无阻流量与实际无阻流量的误差较小,平均为6.2%。
Tuha gas field is a low permeable gas condensate reservoir.The geological structure of Tuha gas field is complicated.The reservoir is deposited deeply with low porosity and permeability,and the difference between initial formation pressure and the dew pressures is very small.The well productivity is low and hard to get stable production.In response to these problems,this paper evaluates factors of gas condensate well productivity of Tuha gas field in terms of depositional environment,formation coefficient,skin coefficient,retrograde condensate blocking,reverse imbibitions,fracture reforming and water production.Based on the analysis above,we propose a new method to predict gas deliverability in Tuha gas field by multiple regression method.And,it is revealed that,the favorable micro sedimentary facies,higher formation coefficient,and fracturing may enhance the productivity of gas well,and high skin coefficient,retrograde condensate blocking and water yielding may lower the productivity of gas well.It is proved valid by the field test,and the flow rate calculated by this method is only 6.2% differing from the actual flow rate.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2010年第6期82-84,共3页
Petroleum Geology and Recovery Efficiency
关键词
凝析气藏
产能
影响因素
预测
吐哈气田
gas condensate reservoir
deliverability
influence factor
prediction
Tuha gas field
