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松南气田火山岩气藏产能评价主要以修正等时试井或回压试井为主,通过“二项式”或“一点法”计算无阻流量,但是由于火山岩成藏及储层分布的特殊性,无阻流量不能完全真实反映各井产能,因此结合压降储量、单位平方压差下产气量对比及试采情况对产能进行综合评价,发现各井产能存在较大差异,通过地质分析认为产能的主控因素:火山机构、储层物性、井型及边底水影响;依此认识,松南气田下一步井位优化部署主要以S1火山机构为主,选取构造位置相对较高和古地形相对较高位置布井,井型以水平井为主,井轨迹尽可能选择高孔渗体和裂缝相对发育部位,以获得较高单井产能,同时也利于规避底水锥进的风险。
The production evaluation of volcanic gas reservoirs in Songnan gas field mainly revises the isochronal well test or back-pressure well test and calculates the unobstructed flow through the “Binomial” or “one-point method”. However, due to the volcanic reservoir formation and reservoir distribution The unobstructed flow rate can not completely reflect the production capacity of each well. Therefore, in combination with the pressure drop reserves, the comparison of gas production rate under unit square pressure difference and the trial production, the comprehensive evaluation of production capacity shows that there is a big difference in production capacity of each well. Through geological analysis According to this understanding, the well location of Songnan gas field is mainly dominated by S1 volcano body, and the structural location is relatively high and the ancient The wells with relatively high topography are well-routed. The well type is mainly horizontal wells. The well trajectory selects high-permeability and fractures relative development sites as much as possible to obtain higher single-well productivity and avoid the risk of bottom water coning.