南海薄互层状储层水平井控缝高压裂模拟研究  

Simulation of fracture-height control fracturing of horizontal well in thin interbedded reservoir in the South China Sea

作　　者：冯高城 姚为英 匡腊梅 陈凯 冯钊 张云鹏 张雨 马良帅 熊俊杰 FENG Gaocheng;YAO Weiying;KUANG Lamei;CHEN Kai;FENG Zhao;ZHANG Yunpeng;ZHANG Yu;MA Liangshuai;XIONG Junjie

机构地区：[1]中海油能源发展股份有限公司工程技术分公司 [2]中海石油(中国)有限公司深圳分公司

出　　处：《海相油气地质》2022年第3期289-299,共11页Marine Origin Petroleum Geology

基　　金：中海油能源发展重大专项“南海油田增储上产配套技术研究与应用”的子课题“近井复杂流动模拟与油藏耦合技术研究”(项目编号:HFZXKT-GJ2020-0202)资助。

摘　　要：我国南海存在储量规模较大的深层砂岩油田,采用常规开发技术的单井产量无法满足海上油田开发的经济门槛要求,以致于有效动用储量困难。以南海珠江口盆地陆丰凹陷H油田深层系储层为例,通过地质特征与压裂可行性分析,提出了基于排驱压力的储层分类方法,拟解决储层改造后天然渗流空间极限增容表征的难题。针对薄互层状储层压裂存在的裂缝起裂困难与过度延伸等问题,通过综合地震、测井、实验、工艺等数据,研究了岩石综合三维脆性指数表征方法,建立了组合控缝高压裂的三维数值模型。研究表明:组合控缝高工艺和薄互层状储层特征相适配,压裂造缝可有效起裂与适度延展,增强了天然储集体与压裂缝之间的油气渗流能力,单井产能大幅度释放,产能增幅有效期相对较长。研究成果为海上低渗透油田大规模开发提供了依据。There are deep sandstone oil fields with large reserves in the South China Sea. The single well production using conventional development technology cannotmeet the economic threshold of offshore oil fields, which makes effective production difficult. Large-scale horizontal well fracturing technology is an important way to improve productivity and reduce economic threshold of offshore oil fields. However, staged fracturing of horizontal well also faces difficulties in fine geological design and fracturing scale design. Taking the deep reservoir of H Oilfield in the South China Sea as an example, through the analysis of geomechanical characteristics and fracturing feasibility, a reservoir classification method based on displacement pressure is proposed to solve the problem of characterization of ultimate capacity increase of natural seepage space after reservoir reconstruction for staged fracturing of horizontal wells, by constructing the evaluation model of index parameters. Aiming at the problems of fracture initiation difficulty and excessive extension in the fracturing of interbedded reservoir, through integrating the data of seismic, logging, experiment and technology, a comprehensive three-dimensional rock brittleness index characterization method is applied. The numerical model of combined fracture-height control fracturing is established, the fracture morphology and retrofit volume is predicted, and future productivity of wells is obtained. The research shows that high temperature resistant seawater based fracturing fluid is suitable for deep reservoir, and the type II reservoir with capacity of natural flow is the key of fracturing reconstruction. By matching the combined fracture-height control technology and the characteristics of thin interbedded reservoirs, the fractures can effectively initiate and extend moderately, which enhances the oil and gas seepage capacity between the natural reservoir and the hydraulic fractures. The single well productivity is released greatly,and the validity period is rela

关 键 词：薄互层 深层 低渗储层 水平井 控缝高 压裂 三维数值模拟 南海 

分 类 号：TE357.2[石油与天然气工程—油气田开发工程]