摘要
扶余油田外围区块原油密度大、黏度高、凝固点高、含蜡量高,采用常规胍胶携砂压裂技术无法有效开采,压裂投产后初期产量较低,达不到效益产能,外围区块基本处于未开发动用状态。为此,研发了生物胶降黏剂体系与压裂工程技术相配套的降黏压裂技术,并进行了实验评价。评价结果显示,该生物胶具有降凝、降黏、防蜡、乳化、驱油等性能,可显著提高原油流动性。现场试验分为生物胶降黏加砂压裂和生物胶降黏不加砂压裂两种技术方式,共在扶余外围及稠油区块累计实施45口井。前置液胍胶造主裂缝+支撑剂+生物胶降黏剂+支撑剂+后置液降黏剂的技术方法应用在新投产的外围及稠油区块,对比老区内部,在储层物性变差的条件下,投产后产油量超设计产能1.6倍,是老区内部的1.4倍。生物胶降黏不加砂压裂技术主要应用在老井二次压裂或多轮次压裂稠油区块或黏度上升井层,同等条件下对比,黏度由压裂前的70mPa·s下降到25mPa·s,增产量是同区块常规压裂的1.3倍。
The crude oil in the peripheral block of Fuyu Oilfield has high density,high viscosity,high freezing point,and high wax content.It can′t be effectively developed by the conventional guar gum sand-carrying fracturing technology.After fracturing is put into operation,the initial production is low and can′t be the effective productive capacity,and the peripheral block is undeveloped and produced.Therefore,the bio-gel viscosity reducer system is developed,and the corresponding viscosity-reducing fracturing technology matching fracturing engineering technology has been proposed and evaluated experimentally.The evaluation results show that the bio-gel has the properties of gel reduction,viscosity reduction,wax control,emulsification,and oil displacement,and can significantly improve the flow of crude oil.The field test is done on bio-gel viscosity re-duction and sand fracturing,and bio-gel viscosity reduction fracturing without adding sand.A total of 45 wells have been implemented in Fuyu peripheral and heavy oil blocks.The technology of major fractures generated by pre-fluid guar gum+proppant+bio-gel viscosity reducer+proppant+post-fluid viscosity reducer is applied to the newly developed peripheral and heavy oil blocks.The oil production after putting into produc-tion is more than 1.6 times as the designed production capacity,and 1.4 times as the old area under the condition of poor reservoir physical properties.The technology of bio-gel viscosity reduction fracturing without adding sand is mainly applied to the heavy oil blocks of old wells with secondary fracturing or multiple-round fracturing or the well layers with increased viscosity.Under the same conditions,the viscosity decreased from 70mPa·s before fracturing to 25mPa·s,and the increased production is 1.3 times that of conventional fracturing in the same block.
作者
何增军
宋成立
马胜军
王凤宇
王永忠
陈存玉
He Zengjun;Song Chengli;Ma Shengjun;Wang Fengyu;Wang Yongzhong;Chen Cunyu(Fuyu Oil Production Plant of PetroChina Jilin Oilfield Company,Songyuan Jilin 138000;Tianjin Saint JunYu Biotech Group Co.,Ltd.,Tianjian 300451)
出处
《中外能源》
CAS
2024年第3期57-61,共5页
Sino-Global Energy
基金
2023年中国石油天然气集团有限公司技能人才创新基金项目“老油田边部、外围稠油油藏降黏压裂技术研究及矿场应用”(编号:2023JL0321)。
关键词
生物胶
降黏压裂
原油流动性
防蜡
外围区块
稠油
bio-gel
viscosity reduction fracturing
crude oil fluidity
wax control
peripheral block
heavy oil
