超深裂缝性厚层改造效果影响因素分析与高效改造对策

发布时间：2018-01-15 04:31

本文关键词：超深裂缝性厚层改造效果影响因素分析与高效改造对策　出处：《天然气地球科学》2017年08期 　论文类型：期刊论文

【摘要】：针对塔里木油田超深裂缝性厚层改造效果不理想问题,分析确定了影响储层改造效果的主要因素及其影响规律,提出了储层高效改造对策。地质力学研究结果认为影响裂缝开启的因素主要有储层天然裂缝产状、储层地应力、改造时引起的孔隙压力增量、天然裂缝走向与最大主应力方向夹角、裂缝内聚力等。高角度天然裂缝容易发生剪切破坏开启;改造时孔隙压力增量越大、最大最小主地应力差越大,天然裂缝就越易剪切破坏开启;天然裂缝走向与最大主应力方向夹角越小,天然裂缝就越易剪切破坏开启;裂缝内聚力对裂缝开启率的影响较大,降低裂缝内聚力可大幅度增加裂缝开启率,裂缝内聚力从14MPa降低到0MPa,天然裂缝开启率从11.5%增加到71.2%,裂缝开启率增加59.7%。油藏数模研究表明提高储层纵向动用程度比提高储层横向动用程度更有利于提高单井产能。现场通过暂堵和大排量泵注提高井底压力,前置酸酸化降低裂缝内聚力,利于增加天然裂缝的开启率、加入可降解暂堵材料提高储层动用程度、改善增产改造效果,实现了储层高效改造的目的。
[Abstract]:In view of the problem that the effect of super-deep fractured thick formation reconstruction is not ideal in Tarim Oilfield, the main factors affecting the effect of reservoir reconstruction and its influencing law are analyzed and determined. It is concluded that the main factors affecting fracture opening are the occurrence of natural fractures, the in-situ stress of reservoir, and the increment of pore pressure caused by the transformation. The angle between the strike of natural fracture and the direction of maximum principal stress, the cohesion of fracture, etc. The larger the increment of pore pressure and the greater the maximum and minimum main stress difference, the easier it is for natural fractures to be opened by shear failure. The smaller the angle between the strike of natural fracture and the direction of maximum principal stress is, the easier the shear failure of natural fracture is. Fracture cohesion has a great influence on fracture opening rate. Reducing fracture cohesion can greatly increase fracture opening rate and decrease fracture cohesion from 14 MPA to 0 MPA. Natural crack opening rate increased from 11.5% to 71.2%. The reservoir mathematical model study shows that it is better to increase the productivity of single well by increasing the vertical production degree of reservoir than by increasing the horizontal production degree of reservoir. In situ, the bottom hole pressure can be increased by temporary plugging and large displacement pump injection. Force. Pre-acidification can reduce fracture cohesion, increase the opening rate of natural fracture, increase reservoir production degree by adding degradable temporary plugging material, and improve the effect of increasing production.
【作者单位】：中国石油勘探开发研究院;中国石油天然气集团公司采油采气重点实验室;中国石油塔里木油田股份分公司;
【基金】：中国石油股份公司重大专项(编号:2014E-32-07)资助
【分类号】：TE34
【正文快照】： 3.中国石油塔里木油田股份分公司,新疆库尔勒841000)Natural Gas Geoscience,2017,28(8):1280-1286.[韩秀玲,杨贤友,熊春明,等.超深裂缝性厚层改造效果影响因素分析与高效改造对策[J].天然气地球科学,2017,28(8):1280-1286.]0引言大北、克深区块位于塔里木盆地北部。目的层巴

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