摘要:
建立单井与群井储层压降漏斗计算模型,使用Matlab软件对柿庄南区块10口煤层气井4个排采时刻进行储层压降传播规律数值模拟分析,通过观察10口井排采动态图发现其形状可分为2类:一类是压降漏斗的横向扩展的速度是缓慢的,纵向扩展较快,这样的形状导致储层压降较大;另一类是压降漏斗横向传播快,纵向扩展的则较慢,煤储层压力在远离井筒地区下降不明显,近井地带则迅速增加。在群井共同排采的情况下,出现井间干扰现象可以增加煤层气总产量,使产气速度增加,同时井间干扰沿主应力方向表现出一定的方向性。
Abstract:
The reservoir pressure drop funnel calculation model for single well and group wells is established, and the reservoir pressure drop propagation law of 10 CBM wells in 4 moments is simulated in southern block of Shizhuang by Matlab software, it is found that the shape can be divided into two categories by observing the dynamic drawing of 10 wells: one is that the velocity of lateral expansion of the pressure drop funnel is slow, and the velocity of longitudinal expansion is fast, such a shape leads to larger reservoir pressure drop; the other one is that the velocity of lateral expansion of the pressure drop funnel is fast, and the velocity of the longitudinal expansion is slow, the coal reservoir pressure is not obvious far away from the wellbore area, and increases rapidly in the near wellbore area. In the case of group wells production, the phenomenon of inter well interference can increase the total production of coalbed methane and increase the gas production rate. Meanwhile, the interwell interference shows a certain direction along the direction of the principal stress.
百度学术
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