低渗透油藏转向压裂产能预测及影响因素

doi:10.7657/XJPG20210110

摘要/Abstract

摘要：

转向压裂可以扩大低渗透储集层泄油面积,达到体积压裂的效果。但转向压裂形成的转向裂缝分布复杂,需要进行精细表征,才能准确预测产能。依据克拉玛依油田的生产资料,针对转向裂缝形态特点,建立储集层中单相流动的数学模型,采用局部网格加密技术,对转向裂缝进行网格细化。经过实例应用,转向压裂后产油量比常规压裂产油量提高了5.3倍。对影响转向压裂产能的影响因素进行评价,结果表明,产油量与储集层渗透率、转向裂缝长度和初次压裂裂缝的导流能力呈正相关,无需很高的转向裂缝导流能力。

关键词: 低渗透油田, 转向压裂, 局部网格加密, 网格细化, 数学模型, 产能预测, 影响因素

Abstract:

Steering fracturing can expand the drainage area of low permeability reservoirs and achieve the effect of volume fracturing. However, the fractures induced by steering fracturing are complicated, and should be finely characterized to accurately predict the post-fracturing productivity. Based on the production data from Karamay oilfield, and in view of the characteristics of steering fractures, a mathematical model of single-phase flow was established, and a grid refinement technology was used to densify the steering fractures. Field application has proved that the oil production after steering fracturing was 5.3 times higher than that of conventional fracturing. The factors influencing the productivity after steering fracturing were evaluated and the result shows that the production is positively correlated with reservoir permeability, steering fracture length and conductivity of initial induced fractures, but not necessarily depending on steering fractures to get a high flow conductivity.

Key words: low permeability oilfield, steering fracturing, local grid densification, grid refinement, mathematical model, productivity prediction, influencing factor

中图分类号:

TE357.14

蒲晓, 郭大立, 兰天, 贺勇, 赵运祥. 低渗透油藏转向压裂产能预测及影响因素[J]. 新疆石油地质, 2021, 42(1): 76-80.

PU Xiao, GUO Dali, LAN Tian, HE Yong, ZHAO Yunxiang. Productivity Prediction and Influencing Factors of Low Permeability Reservoirs After Steering Fracturing Stimulation[J]. Xinjiang Petroleum Geology, 2021, 42(1): 76-80.

图/表 5

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