超低渗油藏水平井井间干扰影响因素分析及井距优化
Analysis of influencing factors of horizontal well interwell interference and well spacing optimization in ultra-low permeability reservoir
任佳伟 1白晓虎 2卜军 2王飞 2余金柱2
作者信息
- 1. 中国石油长庆油田分公司 油气工艺研究院,西安 710018;西安石油大学石油工程学院,西安 710065
- 2. 中国石油长庆油田分公司 油气工艺研究院,西安 710018;低渗透油气田勘探开发国家工程实验室,西安 710018
- 折叠
摘要
鄂尔多斯盆地超低渗油藏开发已进入中期,新井加密和老井重复压裂已成为区域采收率提高的重要手段,体现出井间距持续变小,压裂规模持续增长的趋势,导致出现井间干扰程度高以及单井产量快速递减等问题.为解决井间干扰程度评价及预防控制等问题,利用油藏数值模拟方法,建立了水平井组数值模拟模型,评价单井及井组压裂改造后动用范围,开展井间干扰程度影响因素分析.结果表明:基质渗透率及天然裂缝渗透率越高,单井压裂规模越大,井间距越小,井间干扰程度越明显.单井EUR和区块整体采收率存在最佳匹配关系,需要优化合理井距来平衡区块采收率和单井累积产量的关系.以上研究结果可为井距优化及重复压裂技术应用提供有效指导.
Abstract
The development of ultra-low permeability reservoirs in the Ordos Basin has entered its mid-term stage.New well infill drilling and refracturing of existing wells have become important methods for improving regional recovery rates,demonstrating trends of continuously decreasing well spacing and increasing fracturing scale.This has led to issues such as high well interference and rapid decline in single well production.To address the evaluation and prevention of well interference,a numerical simulation model of a horizontal well group was established using reservoir numerical simulation methods.This model evaluates the extent of stimulation after fracturing for individual wells and well groups and analyzes the influencing factors of well interference degree.The results indicate that higher matrix permeability,higher natural fracture permeability,larger single well fracturing scale,and smaller well spacing all contribute to more significant well interference.There exists an optimal matching relationship between single well EUR(estimated ultimate recovery)and overall block recovery rate,necessitating the optimization of reasonable well spacing to balance block recovery rate and single well cumulative production.These research findings provide effective guidance for well spacing optimization and the application of refracturing technology.
关键词
华庆油田/超低渗油藏/水平井/井间干扰/井距优化Key words
Huaqing Oil Filed/ultra-low permeability reservoir/horizontal well/interwell interference/well spacing optimization引用本文复制引用
基金项目
中国石油天然气股份有限公司重大科技专项(2023ZZ17YJ03)
中国石油天然气股份有限公司重大科技专项(2023ZZ28YJ07)
出版年
2024
NETL
NSTL
万方数据