鱼骨型分支井SAGD分支形态优化及采出程度变化规律

doi:10.3969/j.issn.1006-6535.2024.01.007

摘要/Abstract

摘要： 风城油田低物性段普遍发育,储层非均质性严重。鱼骨型分支井SAGD通过分支深入储集层可改善常规SAGD蒸汽腔扩展受限的问题。为了达到最佳开采效果,有必要对鱼骨型分支井SAGD的分支形态进行优化,并掌握影响采出程度变化的规律。为此,利用油藏数值模拟及正交实验设计的手段,确定分支参数对提高采出程度具有敏感性,并优化分支参数,分析不同储层物性下分支参数对采出程度的影响规律。将研究成果应用于风城油田,该研究区块的最佳井型部署方案为:分支长度为120 m、分支数量为4条、分支角度为75 °、分支异侧为非对称分布、分支间距为100 m。通过研究可知,各分支参数的影响权重以储层渗透率2.0 D为明显的分界点:当储层渗透率小于2.0 D时,主要影响因素为分支长度、分支数量;储层渗透率为2.0 D时,分支角度、分支间距的作用开始变强。研究成果对风城油田SAGD驱进一步提高采收率具有重要的指导意义。

关键词: 鱼骨型分支井SAGD, 分支形态优化, 数值模拟, 提高采收率, 风城油田

Abstract: Reservoir properties in Fengcheng oilfield are commonly poor, and their heterogenity is strong. SAGD fishbone multilateral wells can address the issue of limited steam chamber expansion of conventional SAGD by lateral penetrating deeply into the reservoir. In order to achieve the best development effect, it is necessary to optimize the lateral morphology of SAGD fishbone multilateral wells and grasp the law that affects the recovery variation. To this end, reservoir numerical simulation and orthogonal test design are used to determine the sensitivity of the lateral parameters to enhance oil recovery and optimize the lateral parameters. As a resunt, the influence of the lateral parameters on enhanced oil recovery is analyzed in reservoirs with different physical properties. The research results are applied to Fengcheng Oilfield, and the optimal well deployment scheme for the target block is as follows: lateral length is 120 m, the number of laterals is 4, the angle of laterals is 75 °, the laterals are asymmetrically distributed, and the spacing between laterals are 100 m. The research showed that the influence weights of each lateral parameter take the reservoir permeability of 2.0 D as the obvious cutoff point: the main influencing factors are lateral length, lateral angle, and lateral spacing when the reservoir permeability is less than 2.0 D, and the influence of lateral parameters on the increase of recovery, the impact of lateral angle and lateral spacing starts to become stronger when the reservoir permeability 2.0 D The Study results are of great significance for further enhanced oil recovery of the recovery of SAGD drive in Fengcheng Oilfield.

Key words: SAGD fishbone multilateral well, lateral morphology optimization, numerical simulation, enhanced oil recovery, Fengcheng Oilfield

中图分类号:

TE345

周志军, 张祺, 衣犀, 唐佳琦, 张国青. 鱼骨型分支井SAGD分支形态优化及采出程度变化规律[J]. 特种油气藏, 2024, 31(1): 57-65.

Zhou Zhijun, Zhang Qi, Yi Xi, Tang Jiaqi, Zhang Guoqing. Optimization of Lateral Morphology of SAGD Fishbone Multilateral Wells and Recovery Change Law[J]. Special Oil & Gas Reservoirs, 2024, 31(1): 57-65.

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