裂缝承压能力模型及其在裂缝地层堵漏中的应用  

CRACK PRESSURE BEARING CAPACITY MODEL AND ITS APPLICATION TO PLUGGING OF FRACTURED FORMATION

作　　者：杨沛[1] 陈勉[1] 金衍[1] 朱千千[1] 温航[1] 李宁[2] 杨成新[2] 文志明[2] 

机构地区：[1]中国石油大学石油工程学院,北京102249 [2]中国石油塔里木油田分公司,新疆库尔勒841000

出　　处：《岩石力学与工程学报》2012年第3期479-487,共9页Chinese Journal of Rock Mechanics and Engineering

基　　金：教育部新世纪优秀人才支持计划(NCET–08–0840)

摘　　要：由于井漏问题的复杂性,它一直是困扰国内外石油勘探、开发的重大工程技术难题。通过将现场测井得到的裂缝进行简化,并按照力学的基本原理对影响裂缝应力强度因子的因素进行分解,建立复合地层裂缝承压能力模型并结合裂缝宽度模型,得到裂缝承压能力同堵漏材料封堵位置、封堵颗粒直径之间的关系。通过建立的裂缝承压模型进行计算发现,封堵位置对于裂缝承压能力具有很大的影响,封堵位置离缝尖距离越大,裂缝承压能力越强;当封堵位置不变时,裂缝承压能力随井筒内流体压力的增加而线性减小,而封堵位置越靠近缝尖,裂缝承压能力减小的幅度越大。通过建立缝宽模型并结合以上分析,筛选出不同颗粒堵漏材料并进行室内复配试验,建立适合于塔里木油田吉迪克组地层的堵漏配方。通过现场试验验证,该复合地层裂缝承压能力模型在现场堵漏工作中具有很好的指导意义。The complicated wellbore leakage issue has been the major engineering problems in the exploration and production of petroleum industry.In this paper,fracture morphology is obtained by simplifying log data,the influence factors of fracture stress intensity factor K are decomposed and analyzed according to the mechanism;then pressure bearing capacity model of multilayer is established based on the decomposition of influence factors of K,the relationships between pressure bearing capacity,sealing position and sealing particles are calculated and discussed.Through the calculation,it is believed that plugging position has great influence on pressure bearing capacity.The larger the distance from plugging position to fracture tip is,the larger the pressure bearing capacity is.When fracture position is settled,pressure bearing capacity decreases linearly along with the increase of fluid column pressure in wellbore.The smaller the distance from plugging position to fracture tip is,the larger the decreasing amplitude of pressure bearing capacity is.This model can be used for plugging materials selection and optimization of plugging formula.Optimizing plugging particles of different diameters is done through the establishment of fracture width model,plugging formula that suitable for the Jidike Formation of Tarim Oilfield is developed and verified through field test.It is proved that this model is suitable for the field plugging operation.

关 键 词：岩石力学 复合地层 承压能力 漏失 堵漏 应力强度因子 

分 类 号：TU45[建筑科学—岩土工程]