【作者】 余芳；

【导师】 王杰祥； 徐克彬；

【作者基本信息】 中国石油大学(华东) ， 石油与天然气工程（专业学位）， 2019， 硕士

【摘要】 复杂断块V6具有构造破碎、内部断层复杂、储层非均质性严重、联通性差、地层流体流通困难、压裂稳产期短、水井吸水能力差等特点。目前随着十几年的开采,地层能量亏空更加严重,原油产量递减越来越快,后备储量严重不足。如何分析优选出有潜力的井层,深入研究制定合理有效的增产方案进行改造,满足增储上产要求,是迫切想解决的工程实际问题。本文首先从整个复杂断块的油藏地质概况、生产井史情况、前期压裂改造效果等,整体认识和评价了复杂断块油藏的压裂特点。然后研究对比了新型AT压裂液及超级瓜胶压裂液体系的流动规律及各项性能实验评价指标,根据本区块井的储层水敏特点、物性差及相关岩性特征、压力、温度等情况来筛选出适合的新型AT压裂液配方。该液体体系增粘机理与以往压裂液体系不同,采用新的超分子交联理论,通过分子间静电吸引作用增粘,突破了传统的压裂液体系中使用金属离子交联和疏水缔合物的疏水缔合交联,伤害率由25.3%降到20.56%降低了近5%,残渣含量46.89 mg/L降为0,摩阻系数由0.251降到0.128降低了近1/2,并且破胶液是小阳离子,有很强的防膨能力,适合该断块致密强水敏储层的特点。在多方面深入研究分析区块特点的基础上,探索和应用了国内外先进的选井选层技术方法。运用新的灰色关联度综合评价法选井选层相关理论分析,结合区块各井油藏品质及生产能力等多项关系复杂的因素,进行相应的计算分析,再与注采体系研究结合,全面科学准确地评价优选井增产潜力,优选出9口潜力井合理排序。采用本文研究结果开展两口井实际应用研究,形成针对性优化设计方案及压后分析评价,V6-38x井日增油量9.8 t,增液量15 m~3,含水较压前有所降低,增产效果显著;V6-12x井日增油量2.8 t,增液量3.5 m~3,增产效果明显。通过两口井的改造结果证明了该研究成果为V6断块增产改造提供了重要的理论依据和实际施工指导作用。更多还原

【Abstract】 Complex fault block V6 has the characteristics of structural fracture,complex internal fault,serious reservoir heterogeneity,poor connectivity,difficulty in formation fluid circulation,short fracturing stability period,and poor water absorption capacity of water wells.At present,with more than ten years of mining,the formation energy deficit is more serious,the crude oil production is declining faster and faster,and the reserve reserves are seriously insufficient.How to analyze and optimize the potential wells,and to study and formulate reasonable and effective stimulation programs to transform and meet the requirements for increasing reserves and production engineering problem.In this paper,the overall understanding and evaluation of the block is carried out from the reservoir geological overview of the entire complex fault block,the history of the production well,and the characteristics of the pre-fracturing transformation.The research compares the flow law of the new AT fracturing fluid and the super guar fracturing fluid system and the experimental evaluation indexes of various performances.According to the reservoir water sensitivity characteristics,physical properties and related lithological characteristics,pressure and temperature of the block wells.Etc.to screen out suitable new AT fracturing fluid formulations.The viscosity-increasing mechanism of the liquid system is different from that of the conventional fracturing fluid system,and the new supramolecular cross-linking theory is adopted,that is,the intermolecular electrostatic attraction is used to thicken,which breaks through the use of metal ion cross-linking and hydrophobic association in the traditional fracturing fluid system.Hydrophobic association crosslinks.The damage rate decreased by nearly 5%from 25.3%to 20.56%,and the residue content 46.89 mg/L reduced to 0,the friction coefficient from 0.251 to 0.128 decreased by nearly 1/2,and the gel solution is small cationic,has a strong anti-swelling capacity.Which is suitable for the characteristics of the tight and strong water sensitive reservoir in the fault block.On the basis of in-depth study and analysis of the characteristics of the block in many aspects,the advanced method of selecting wells and selecting layers at home and abroad was explored and applied.The new gray correlation degree comprehensive evaluation method is used to select the relevant theoretical analysis of the well selection layer.Combining with the complex factors such as reservoir quality and productivity of each oil well in the block,the corresponding calculation and analysis are carried out,and then combined with the injection-production system research,the stimulation potential of optimized wells is evaluated comprehensively,scientifically and accurately,and nine potential wells are selected for rational ranking.Using the research results of this paper to carry out the practical application research of two wells,forming a targeted optimization design scheme and post-pressure analysis and evaluation.The daily oil increase of V6-38x well was 9.8 t,the liquid volume was 15 m~3,the water content was reduced before pressure,the fracturing effect was significant,and the well layer was better.V6-12x well day The oil increase is 2.8 t,the liquid addition is 3.5 m~3,and the fracturing effect is obvious.The results of the transformation of the two wells prove that the research results can provide theoretical and practical construction guidance for the V6fault block stimulation.更多还原