考虑诱导缝多段压裂水平井非均质改造压力动态模型研究  

PRESSURE TRANSIENT MODEL OF MULTI-STAGE FRACTURED HORIZONTAL WELL WITH INDUCED FRACTURE FOR HETEROGENEOUS STIMULATED RESERVOIR VOLUME

作　　者：徐有杰 向祖平[1] 张小涛 于梦男 余星颖 Youjie;Xiang Zuping;Zhang Xiaotao;Yu Mengnan;Yu Xingying(Chongqing University of Science and Technology,Chongqing 401331,China;Sichuan Shale Gas Exploration and Development Co.,Ltd.,Chengdu 610051,China;PetroChina Liaohe Oilfield,Liaoning 124010,China;PetroChina Test and Repair Company of Chuanqing Drilling Engineering Co.,Ltd.,Chongqing 401120,China)

机构地区：[1]重庆科技学院,重庆401331 [2]四川页岩气勘探开发有限责任公司,成都610051 [3]中国石油辽河油田分公司,辽宁盘锦124010 [4]川庆钻探工程有限公司试修公司,重庆401120

出　　处：《力学学报》2023年第3期656-668,共13页Chinese Journal of Theoretical and Applied Mechanics

基　　金：中国石化海相油气藏开发重点实验室开放基金(33550000-22-ZC0613-0285);中国石油股份公司课题(2021DJ2105)资助项目。

摘　　要：为了准确模拟致密油藏水平井大规模压裂形成复杂裂缝网络系统和非均质储层井底压力变化,建立考虑诱导缝矩形非均质储层多段压裂水平井不稳定渗流数学模型,耦合裂缝模型与储层模型得到有限导流裂缝拉普拉斯空间井底压力解,对两种非均质储层模型分别利用数值解、边界元和已有模型验证其准确性.基于压力导数曲线特征进行流动阶段划分和参数敏感性分析,得到以下结果:和常规压裂水平井井底压力导数曲线相比较,理想模式下,考虑诱导缝影响时特有的流动阶段是综合线性流阶段、诱导缝向压裂裂缝“补充”阶段、储层线性流动阶段和拟边界控制流阶段.诱导缝条数的增加加剧了综合线性流阶段的持续时间,降低了流体渗流阻力,早期阶段压力曲线越低;当诱导缝与压裂裂缝导流能力一定时,裂缝导流能力越大,线性流持续时间越长;当所有压裂裂缝不在一个区域时,沿井筒方向两端区域低渗透率弱化了低渗区域诱导缝流体向压裂裂缝“补充”阶段,因此,沿井筒方向两端区域渗透率越低,早期阶段压力曲线越高;当所有压裂裂缝在一个区域时,渗透率变化只影响径向流阶段之后压力曲线形态,外区渗透率越低,早期径向流阶段之后压力曲线越高.通过实例验证,表明该模型和方法的实用性和准确性.In order to simulate accurately wellbore pressure transient performance of multi-stage fractured horizontal well(MFHW)with the complex fracture network and heterogeneous in tight oil reservoirs,an unsteady seepage mathematical model of the MFHW with induced fractures in rectangular heterogeneous reservoir is established.The wellbore pressure solution is obtained by coupling the fracture model,the reservoir model and heterogeneous reservoir interface model.The wellbore pressure accuracy of the two heterogeneous reservoir models is verified by numerical solutions,boundary element method and previous model.By flow stages analysis and parameters sensitivity analysis,the following results can be obtained.Compared with the wellbore pressure derivative curve of the MFHW in homogeneous reservoir,the unique flow stages of this model in the ideal case include:the complex linear flow stage,the"supply"stage from induced fractures to fractured fractures,the linear flow stage and the pseudo boundary control flow stage.The increase of induced fracture number extends the duration of the complex linear flow stage and reduces the fluid seepage resistance.Therefore,the pressure curve of the early stage is lower.If the conductivity of induced fracture and fractured fracture is constant,the greater the conductivity is,the longer the duration of the bilinear flow regime is.When all fractured fractures are different region,the two end low permeability region along the wellbore weakens the"supply"stage.Therefore,the lower the permeability along the wellbore is,the higher the pressure curve at the early stage is.When all fractured fractures are in same area,the permeability change only affects the pressure curve shape after the radial flow stage.The lower the permeability of the outer area is,the higher the pressure curve after the early radial flow stage is.The practicability and accuracy of the model and method are demonstrated by the field example.

关 键 词：压裂水平井 诱导缝 非均质改造 有限导流裂缝 井底压力动态 

分 类 号：TE312[石油与天然气工程—油气田开发工程]