水平井在凝析气藏开发中的适应性分析  

Adaptability analysis of horizontal wells in gas condensate reservoirs

作　　者：张云[1] 

机构地区：[1]中国石化西北油田分公司雅克拉采气厂

出　　处：《天然气工业》2010年第8期38-41,共4页Natural Gas Industry

摘　　要：对水平井开发凝析气藏中的储层特征、储层非均质性、凝析油含量及地露压差的适应性分析,以及数值模拟的结果表明:水平井通过改变油气藏中的流动条件,能实现小压差下的大流量生产,降低边底水锥进的速度,较小的生产压差,可以延缓储层反凝析,从而使储层包含更多的重组分,减缓了储层气田露点的升高,有利于提高凝析油采收率,有效地抑制了反凝析;水平井单井控制储量大,较长的水平段增加了井筒与储层接触面积,从而增加油气井的产量,提高凝析油和凝析气的采收率。对比分析某凝析气藏水平井与直井的开发效果,在气藏总体非均质性不强的情况下,2口水平井的应用效果较好,平均日产气量大幅提高,表明水平井在凝析气藏开发中具有很大的潜力。In this paper,an adaptability analysis is made on the geologic features,reservoir heterogeneity,content of the condensate,and the difference between the formation and the dew point pressure during the development of condensate gas reservoirs in horizontal wells.Together with the numerical simulations,it is shown that the horizontal wells can achieve a large oil and gas flow production under the circumstances of small pressure differences by changing the flow conditions in the oil/gas reservoirs.Moreover,it can decrease the coning rate of the edge and bottom water,and retrograde condensation can be deferred in the reservoir.As a result,more heavy constituents are included in the reservoir,the hoist of the dew point is postponed,the recovery rate of the condensate oil is increased and the retrograde condensation is restrained effectively.The single well controlled reserves is large in the horizontal wells and the relatively longer horizontal part increases the contact area between the wellbore and the reservoir,which increases the production of the oil/gas wells and improves the recovery rates of condensate oil and condensate gas.The comparison of the development effects between a horizontal and a vertical well in a reservoir shows that the application of the two horizontal wells will achieve good results if the reservoir heterogeneity is not very strong on the whole.Daily average gas production is greatly improved under the circumstance of the slight heterogeneity in the reservoir.All these indicate that the horizontal wells are with high production potentials during the development of condensate gas reservoirs.

关 键 词：凝析油气田 水平井 开发 反凝析 采收率 适应性 

分 类 号：TE372[石油与天然气工程—油气田开发工程]