砾岩裂缝动态闭合规律实验研究  

Experimental Study on Dynamic Closure Law of Conglomerate Fractures

作　　者：黄瑞 袁雨婷 周峰旭 张嘉鹏 蒲元鹏 HUANG Rui;YUAN Yuting;ZHOU Fengxu;ZHANG Jiapeng;PU Yuanpeng

机构地区：[1]中国石油大学(北京)克拉玛依校区,新疆克拉玛依834000

出　　处：《化工设计通讯》2025年第1期77-80,共4页Chemical Engineering Design Communications

基　　金：中国石油大学(北京)克拉玛依校区青年人才基金项目(XQZX20230036)。

摘　　要：水力压裂技术是经济开发致密砾岩储层的必备手段,明确水力裂缝导流能力动态变化特征对指导砾岩储层水力压裂设计,确保油井高产稳产具有重要意义。考虑基质不同支撑方式和裂缝不同存在方式的砾岩属性,开展了水力裂缝动态闭合规律实验研究,优选函数模型能够准确预测不同应力条件下砾岩储层水力裂缝渗透率值。主要结论 :围压加载导致砾岩岩心伤害不可逆,渗透率随围压变化表现出三个阶段特征,即陡降段、平稳段和缓降段;杂基颗粒支撑岩石裂缝渗透率降低幅度达92.91%,远高于多级颗粒支撑(53.32%)和杂基支撑(28.55%);杂基颗粒支撑岩石裂缝,铺砂相对于未铺砂及基质岩石而言,具有最高的渗透率及最低的渗透率降低幅度。Hydraulic fracturing technology is a necessary means for economic development of tight conglomerate reservoirs.It is of great significance to clarify the dynamic change characteristics of hydraulic fracture conductivity for guiding hydraulic fracturing design of conglomerate reservoirs and ensuring high and stable production of oil wells.The experimental study on the dynamic closure law of hydraulic fractures is carried out considering the properties of conglomerate with different support modes of matrix and different existing modes of fractures.The optimal function model can accurately predict the permeability of hydraulic fractures in conglomerate reservoirs under different stress conditions.The main conclusions of this paper are as follows.The damage of conglomerate core caused by confining pressure loading is irreversible.The permeability changes with confining pressure show three stages of characteristics,namely,steep decline,stable and slow decline.The decrease of fracture permeability of rock supported by hybrid particle reaches 92.91%,which is much higher than that of multi-stage particle support(53.32%)and hybrid particle support(28.55%).Heterogeneity particles support rock fractures,and sand-laying has the highest permeability and the lowest permeability reduction compared with non-sand-laying and matrix rocks.

关 键 词：造缝 砾岩裂缝 闭合规律 动态测试 实验 

分 类 号：TE31[石油与天然气工程—油气田开发工程]