延长油田超低渗透油藏水平井分段压裂开采参数优化研究及应用  

A STUDY ON STAGED FRACTURING PARAMETER OPTIMIZATION FOR HORIZONTAL WELLS IN ULTRA-LOW PERMEABILITY RESERVOIRS AT YANCHANG OILFIELD

作　　者：韩小琴 石立华 柳朝阳[3] 赵思远 周昕 冯婷婷 HAN Xiaoqin;SHI Lihua;LIU Zhaoyang;ZHAO Siyuan;ZHOU Xin;FENG Tingting(Research Institute of Shanxi Yanchang Petroleum(Group)Co. Ltd., Xi’an,Shanxi 710075, China;China University of Petroleum,Beijing 102249, China;Exploration and Development Technology Research Center, Yanchang Oilfield Co. Ltd, Yan an, Shanxi 716000, China)

机构地区：[1]陕西延长石油(集团)有限责任公司研究院 [2]中国石油大学,北京 [3]延长油田股份有限公司勘探开发技术研究中心

出　　处：《钻采工艺》2018年第6期61-64,128,129,共6页Drilling & Production Technology

基　　金：国家科技重大专项“大型油气田及煤层气开发”(编号:2011ZX05003-001)。

摘　　要：文章基于超低渗透水平井分段压裂大型物理平板模型,进行不同压裂规模、压力驱替下的实验研究。研究结果表明,随着驱替压差的增加,压力梯度升高,相同驱替压差下,裂缝越长,压力梯度越高,增加压裂规模可提高储层动用,在此基础上,针对直井与水平井联合开采井网,对井网形式、水平井长度、裂缝分布形态及导流能力等参数进行了优化,定量表征了对开发效果的影响程度,得到延长油田W区块长9储层800 m水平段采用6~7条裂缝,半长为0. 6倍井距,导流能力为30 D·cm时为最优裂缝布置,最佳井网为水平井采油+直井注水+裂缝交错排列,采用间断型纺锤形布缝时补充能量效果最好,矿场应用后增油效果显著,该研究对延长油田超低渗透储层水平井分段压裂开采参数优选具有重要的理论和矿场意义。Based on the large physical plate model of stage fracturing in ultra-low permeability horizontal wells,experimental research was done under different fracturing scales and pressure displacement.The research results show that,with the increase in displacement differential pressure and pressure gradient,under the same displacement pressure difference,the longer the crack,the higher the pressure gradient,increasing the fracturing scale can improve the reserve recovery.Based on this,in view of the vertical well and horizontal well combined development pattern,optimization of well pattern,horizontal well length,fracture flow conductivity distribution form and parameters are done,the influence on development effects been quantified.800meters long horizontal section in Reservoir9at W block Yanchang oil field is decided to have6-7fractures,the half length is0.6times well spacing,conductivity30d.cm.The optimal well network is horizontal well oil recovery+vertical well water injection+staggered fracture arrangement.The energy replenishment effect is the best when discontinuous spindle-shaped crack pattern adopted.This study is important for the optimization of stage fracturing parameters in ultra-low permeability reservoirs.

关 键 词：超低渗透油藏 水平井 分段压裂 参数优化 物理模拟 数值模拟 应用 

分 类 号：TE357[石油与天然气工程—油气田开发工程]