页岩油水平井采出水笼统补能及二氧化碳补能差异化提高采收率技术  

Commingled energy replenishment and carbon dioxide energy replenishment differential technology for enhanced oil recovery in shale oil horizontal wells

作　　者：付继有 王瑞杰 南征旗 郭涛 柴慧强 郭晨光 岳渊洲 田伟东 许娟莉 FU Jiyou;WANG Ruijie;NAN Zhengqi;GUO Tao;CHAI Huiqiang;GUO Chenguang;YUE Yuanzhou;TIAN Weidong;XU Juanli(Shale Oil Development Branch,PetroChina Changqing Oilfield Company,Qingyang 745000,Gansu,China;National Engineering Laboratory for Exploration and Development of Low-Permeability Oil and Gas Fields,Xi'an,710018,Shanxi,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346-358,共13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：庆城油田页岩油水平井采用大液量体积压裂准自然能量开发,但整体产量递减严重。老油区部分井虽然水平段长,控制储量大,但因初期改造不充分,单井累产油和采收率较低,且老井酸化解堵产能恢复率逐年降低,地层能量不足是产量下降主要因素。为实现页岩油开发地层能量的有序接替和利用,提出了水平井重复压裂补能和采出水笼统补能的对策。通过优先使用回注采出水成熟技术,提高波及体积和驱油效率,再重点通过开展二氧化碳补能及水平井重复压裂室内研究,明确了不同井不同工艺参数的差异化设计。通过开展水平井采出水笼统补能和二氧化碳补能试验4井次及水平井重复压裂提高采收率试验3井次等现场试验,有效提高单井液量4~5倍,同时提升地层能量70%左右。研究结果为不同油井和提采方式实现页岩油水平井高效提高采收率提供了可选择的方法。The shale oil horizontal wells in Qingcheng Oilfield are developed using high volume hydraulic fracturing with quasi natural energy,but the overall production decline is severe.Although some wells in the matured oil area have long horizontal sections and large controlled reserves,due to insufficient initial transformation,the cumulative oil production and recovery rate of single wells are low.In addition,the recovery rate of production by acidizing and unplugging in old wells has been decreasing year by year,and insufficient formation energy is the main factor causing the decline in production.In order to achieve the orderly succession and utilization of formation energy in shale oil development,a strategy of combination of repeated fracturing and produced water commingled energy replenishment in horizontal wells has been proposed.By prioritizing the use of mature technology for reinjection of produced water,the affected volume and oil displacement efficiency are improved,and with a focus on indoor research on carbon dioxide energy replenishment and horizontal well repeated fracturing,the differentiated design of different process parameters for different wells is clarified.By conducting field experiments such as commingled energy replenishment and carbon dioxide energy replenishment tests on horizontal well produced water for 4 wells,as well as repeated fracturing tests for 3 wells to improve oil recovery,the single well fluid volume has been effectively increased by 4 to 5 times,and the formation energy has been increased by about 70%.This technology provides optional methods for achieving efficient recovery of shale oil horizontal wells with different oil wells and extraction methods.

关 键 词：页岩油 工程技术 水平井 二氧化碳 重复压裂 纳米流体 补能 提高采收率 

分 类 号：TE357[石油与天然气工程—油气田开发工程]