矿场参数法优化陆相夹层型页岩油水平井合理井距  

Optimization of reasonable well spacing for continental interbedding shale oil horizontal wells using field parameter method

作　　者：马立军 柴慧强 冯立勇 赵晖 付继有 姜凯宁 罗锦昌 曹玉顺 张紫郁 MA Lijun;CHAI Huiqiang;FENG Liyong;ZHAO Hui;FU Jiyou;JIANG Kaining;LUO Jinchang;CAO Yushun;ZHANG Ziyu(Shale Oil Development Branch,PetroChina Changqing Oilfield,Qingyang 745000,Gansu,China;National Engineering Laboratory for Exploration and Development of Low-Permeability Oil and Gas Fields,Xi'an 710018,Shaanxi,China)

机构地区：[1]中国石油长庆油田页岩油开发分公司,甘肃庆阳745000 [2]低渗透油气田勘探开发国家工程实验室,陕西西安710018

出　　处：《石油钻采工艺》2024年第3期317-325,共9页Oil Drilling & Production Technology

基　　金：国家科技重大专项“鄂尔多斯盆地致密油开发示范工程”(编号:2017ZX05069);中国石油天然气股份有限公司重大专项“鄂尔多斯盆地页岩油勘探开发理论与关键技术研究”(编号:2021DJ1806)。

摘　　要：随着鄂尔多斯盆地庆城油田密切割体积压裂技术的应用,页岩油藏压窜井比例增加,页岩油水平井井距优化已成为亟需解决的问题。为确保鄂尔多斯盆地庆城油田长7页岩油油藏的开发效果,基于理论计算和数值模拟研究结果,进行了不同井距的矿场开发实践,并对其近3年的生产数据进行统计分析,利用单井评估最终可采储量、单井百米油层产量等参数,确定了页岩油水平井合理开发井距。综合井下微地震法、产量不稳定分析法和试井解释方法研究结果,确定了庆城页岩油压裂后有效裂缝半长应不超过150 m,通过实验分析得到有效基质渗流范围为45 m,根据缝网匹配理论,确定合理井距为400 m;基于油藏数值模拟,综合考虑单井产油量和区块累产油量,优选该研究区块井距为400~500 m;根据矿场不同井距水平井实际生产数据统计分析结果,400m井距时单井评估最终可采储量较300 m井距时提高了9.6%,区块采收率较500 m井距时提高了20.8%,综合分析认为400 m井距更适合庆城油田夹层型页岩油水平井开发。研究成果为庆城页岩油藏水平井网部署提供了技术支撑。With the application of close-spaced volume fracturing technology in Qingcheng oilfield in Ordos Basin,the proportion of fracture-driven interactions wells in shale oil reservoirs has increased,and thus,optimization of horizontal well spacing in shale oil has become a major concern.In order to develop Chang 7 shale oil reservoir in Qingcheng oilfield in Ordos Basin as expected,under the guidance of indoor theoretical calculations and numerical simulation studies,the field development practice with various well spacings was carried out,and its 3-year production data were statistically analyzed.Using such parameters as ultimate recoverable reserves of single well and 100 m layer oil production capacity of single well,the optimal well spacing for reasonable development of the shale oil horizontal well is determined.Based on the research results with combination of bottom hole micro-seismic method,rate transient analysis method,and well test interpretation method,it is determined that the effective fracture half-length after fracturing should be no more than 150 m,and the effective matrix seepage range is 45 m.Therefore,the reasonable well spacing is finalized to be 400 m according to the fracture network matching theory.On the basis of numerical simulation of the reservoir,and taking the oil production of a single well and the cumulative oil production of the block into consideration,the well spacing of the studied block is preferred to be 400~500 m.Based on the actual production data analysis of horizontal wells with varying well spacings on site,the assessed ultimate recoverable reserves of a single well with 400 m well spacing is 9.6%higher than that with 300 m spacing,and the block recovery rate is 20.8%higher than that with 500 m spacing.Thus,it is considered that 400 m spacing is more suitable for the development of horizontal wells of interbedding shale oil in Qingcheng Oilfield.

关 键 词：夹层型页岩油 水平井 井距优化 矿场试验 缝网匹配 数值模拟 鄂尔多斯盆地 

分 类 号：TE349[石油与天然气工程—油气田开发工程]