升平气田营城组火山岩气藏合理井网井距研究

STUDY ON REASONABLE PATTERN WELL SPACING OF YING CHENG FORMATION VOLCANIC GAS RESERVOIR IN SHENGPING GAS FIELD

升平气田储集层为中孔低渗火山岩,由于火山岩的特殊性,目前国内外关于火山岩气藏井网井距研究较少,因此如何合理确定火山岩气藏井网井距对于气田开发具有重要意义。本文运用了经济极限方法、试井法、定单井产能法、合理采气速度法、丰度计算法、合理井网密度法等六种方法计算了其极限井距和技术合理井距,最后通过数值模拟法综合确定了适合升平气田营城组火山岩气藏合理井距。研究认为:只要技术合理,井距不低于其经济极限井距都是可行的。最终推荐营城组火山岩采用1200m井距进行气藏开发。

The reservoir of Sheng ping gas field is volcanic formations with medium porosity and low permeability, because the study of volcanic reservoirs are few in the world ,there are few documents about the study of pattern well spacing of volcanic gas reservoirsat home and abroad now. How to determine the pattern well spacing of volcanic gas reservoirs is very important for Shengping gas field. This paper introduce six metheods such as economic limit, reservoir test, single well productivity, reasonable gas recovery velocity, abundance, reasonable well spacing density to calculate it＇s critical spacing and rational technique spacing between wells, according to numerical simulation to define Shengping gas field Yingcheng formation volcanic gas reservoir reasonable pattern well spacing . The study finds it is feasible solong as the reasonable technical well spacing is no less than the economic limiting well spacing. And multidisciplinary analysis recommend Ying cheng formation volcanic gas reservoir to adopt 1200m.