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

作　　者：任佳伟 白晓虎[1,2] 卜军 王飞[1,2] 余金柱[1,2] REN Jiawei;BAI Xiaohu;BU Jun;WANG Fei;YU Jinzhu(Oil&Gas Technology Research Institute,PetroChina Changqing Oilfield Company,Xi’an 710018,China;National Engineering Laboratory of Exploration and Development for Low Permeability Oil and Gas Fields,Xi’an 710018,China;College of Petroleum Engineering,Xi’an Shiyou University,Xi’an 710065,China)

机构地区：[1]中国石油长庆油田分公司油气工艺研究院,西安710018 [2]低渗透油气田勘探开发国家工程实验室,西安710018 [3]西安石油大学石油工程学院,西安710065

出　　处：《非常规油气》2024年第4期79-88,共10页Unconventional Oil & Gas

基　　金：中国石油天然气股份有限公司重大科技专项“特低渗/致密油转变开发方式关键技术研究”(2023ZZ17YJ03);中国石油天然气股份有限公司重大科技专项“水平井井筒重构重复压裂技术与试验”(2023ZZ28YJ07)。

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。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 

分 类 号：TE357[石油与天然气工程—油气田开发工程]