致密气储层直井分层压裂裂缝规模合理性评价
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摘要
为了实现苏里格致密气目标区块低效井的复产及增产目的,针对直井分层压裂的裂缝规模合理性评价方法问题,运用数值模拟手段和回归公式方法,根据不同的渗透率优化缝长及导流能力,并基于不同含水饱和度对导流能力进行修正,由此得到基于渗透率和含水饱和度的裂缝规模参数。分析结果表明:储层物性差(0.1mD)的储层需要较长裂缝及较低导流能力,储层物性好(1mD)的储层更侧重于短缝及高导流能力;含水饱和度高(0.5)的储层导流能力应适当降低,以增大水的流动阻力,实现控水的目的。实例中通过与问题井的设计参数进行对比,诊断出第2层压裂时导流能力与优化参数相比低了86%,为单井诊断提供了定量、简便的思路和方法,具有较强的现实意义。
In order to achieve the goal of reproducing and increasing production of low efficiency wells in Sulige tight gas target block,it is necessary to study the evaluation method of fracture scale rationality for vertical well fracturing.Using numerical simulation method and regression formula method,the fracture length and conductivity were optimized according to different permeability,and the conductivity was modified according to different water saturation,thus the fracture size parameters based on permeability and water saturation were obtained.The analysis showed that reservoirs with poor reservoir physical properties(0.1 mD)need longer fractures and lower conductivity,reservoirs with good reservoir physical properties(1 mD)focus more on short fractures and high conductivity,reservoir conductivity with high water saturation(0.5)should be reduced appropriately in order to increase the flow resistance of water and achieve the purpose of water control.By comparing with the design parameters of problem wells,it is found that the conductivity of layer 2 fracturing is 86%lower than that of optimization parameters,which provides a quantitative and simple way of thinking and method for single well diagnosis,and this method has a strong practical significance.
In order to achieve the goal of reproducing and increasing production of low efficiency wells in Sulige tight gas target block,it is necessary to study the evaluation method of fracture scale rationality for vertical well fracturing.Using numerical simulation method and regression formula method,the fracture length and conductivity were optimized according to different permeability,and the conductivity was modified according to different water saturation,thus the fracture size parameters based on permeability and water saturation were obtained.The analysis showed that reservoirs with poor reservoir physical properties(0.1 mD)need longer fractures and lower conductivity,reservoirs with good reservoir physical properties(1 mD)focus more on short fractures and high conductivity,reservoir conductivity with high water saturation(0.5)should be reduced appropriately in order to increase the flow resistance of water and achieve the purpose of water control.By comparing with the design parameters of problem wells,it is found that the conductivity of layer 2 fracturing is 86%lower than that of optimization parameters,which provides a quantitative and simple way of thinking and method for single well diagnosis,and this method has a strong practical significance.
引文
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[4]何伊丽.苏里格致密砂岩压裂效果评价[D].西安:西安石油大学,2014:59-68.
[5]于永波.新站低渗透油田裂缝参数优化设计[J].大庆石油学院学报,2005,29(4):23-26.
[5]何鑫.致密油水平井压裂数值模拟及裂缝参数优化[J].油大庆石油地质与开发,2018,37(3):158-163.
[6]朱新春.大牛地气田多簇压裂产能影响因素分析及裂缝参数优化[J].油气藏评价与开发,2018,8(2):58-62.
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[8]姚健欢.考虑多种效应的致密气藏不对称裂缝井产能模型[J].非常规油气,2014,1(2):50-54.
[9]郭小哲,赵刚.页岩气藏压裂缝网模拟及沟通效果评价[J].特种油气藏,2015,22(1):99-102.
[10]许洪星,魏攀峰,王祖文,等.无固相绒囊流体混合固相纤维的重复压裂暂堵技术[J].非常规油气,2018,5(4):75-79.