考虑压力敏感影响确定低渗透油藏有效注采井距

doi:10.13809/j.cnki.cn32-1825/te.2023.06.017

摘要/Abstract

摘要：

低渗透油藏实现有效注采的开发井距，需要同时考虑注水井、采油井生产过程中不同压力变化引起的压力敏感效应以及相应启动压力梯度变化的影响。基于低渗透储层基本渗流规律，建立包含启动压力和压力敏感影响的典型注采条件下渗流方程，并采用稳定逐次替换法求解注采单元渗流场，确定出注采开发条件下储层中压力分布规律；考虑油田开井经济日产油量的要求，建立了低渗透压力敏感油藏确定有效开发井距的方法。研究表明，以同时考虑注采井区压敏影响为基准，相比不考虑压敏、只考虑采油井区压敏影响，在同等条件下，注采井距计算结果差别为+9.8 %、-20.6 %；考虑产量界限要求确定的有效注采井距，一般条件下约为极限注采井距的0.7~0.9倍，可以更好地指导低渗压力敏感油藏开发井网的合理部署。

关键词: 启动压力梯度, 压力敏感, 压力场分布, 有效注采井距, 低渗透油田

Abstract:

For designing effective injection and production well spacing in low permeability reservoirs, it's essential to consider the pressure-sensitive effects arising from various pressure changes during the operation of injection and production wells, along with the impact of changes in the start-up pressure gradient. This study builds upon the basic seepage laws of low-permeability reservoirs to establish a seepage equation that incorporates the effects of the starting pressure gradient and pressure sensitivity. Utilizing the stable successive substitution method, the study examines the pressure distribution and the mechanism of reserve production under typical injection-production patterns. Based on the different requirements of the daily output of oil wells in an actual oil fields, a method for solving the effective injection-production well spacing of low-permeability pressure sensitive reservoir is determined. The study shows that, using the pressure sensitivity of the injection and production well area as a benchmark, there is a notable difference in the calculated results for well spacing when compared with scenarios where pressure sensitivity is either not considered or only considered for the production well area. Specifically, these differences are +9.8 % and -20.6 % under the same conditions. Considering the production limit requirements, the effective injection-production well spacing is about 0.7 ~ 0.9 times of the limit injection-production well spacing under normal conditions, which can better guide the reasonable deployment of the development well pattern of low permeability pressure sensitive reservoirs.

Key words: starting pressure gradient, pressure sensitive, pressure distribution, effective injection-production well spacing, low permeability oilfield

中图分类号:

TE348

陈民锋,秦立峰,赵康,王艺文. 考虑压力敏感影响确定低渗透油藏有效注采井距[J]. 油气藏评价与开发, 2023, 13(6): 855-862.

CHEN Minfeng,QIN Lifeng,ZHAO Kang,WANG Yiwen. Effective injection-production well spacing in pressure-sensitive reservoir with low permeability[J]. Petroleum Reservoir Evaluation and Development, 2023, 13(6): 855-862.

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