摘要
鄂尔多斯盆地庆城长7夹层型页岩油通过多年勘探攻关形成的水平井细分切割体积压裂技术实现了规模效益开发,但压后出砂问题始终制约投产后的页岩油单井产量。针对页岩油水平井压后出砂问题,从前期压裂到后期投产,建立了一套基于裂缝远支撑匹配优化、压裂液体系与破胶优化、压后闷井时间优化和井筒处理与排液制度优化的综合出砂控制技术。研究结果表明,小粒径支撑剂沉降速度慢,可有效提高运移距离和支撑面积,减少出砂;变黏滑溜水压裂液体系的改进和全程破胶剂的加入可有效降低返排液黏度,减少出砂;考虑裂缝闭合压力与合理闷井时间可在保证渗吸置换效果的同时减少出砂;带压处理井筒并结合支撑剂临界流速下的排液控制也可进一步减少出砂。通过该综合出砂控制技术的应用,有效降低了庆城页岩油水平井出砂量,在加砂强度增加的情况下,实现了段长归一化出砂量的逐年递减,从2021年的37.3 m^(3)降到了2023年的16.0 m^(3),为庆城页岩油水平井压后产能提供了有力的技术支撑。
In the Qingcheng chang-7 interlayer shale oil in Ordos Basin,the horizontal well subdivision and volumetric fracturing technology developed through years of exploration and research have enabled the realization of scale economy development.However,the issue of sand production has consistently hindered shale oil horizontal wells post-fracturing production.To solve the sand production problem of shale oil horizontal wells after fracturing,a set of comprehensive sand production control technology based on fracture remote support matching optimization,fracturing fluid system and rubber breaking optimization,shut-in time optimization and wellbore treatment and flowback schedule optimization was established from early fracturing to late production.The results show that the microproppant has a slow settling speed,which can effectively improve the migration distance and support area,and reduce sand production.The viscosity of flowback fluid and sand production can be reduced effectively by the improvement of the fluid system and the addition of the whole process rubber breaker.Considering the fracture closure pressure and the reasonable shut-in time,sand production can be reduced while the imbibition displacement effect can be ensured.Pressure treatment of the wellbore combined with flow control at critical proppant flow rates further reduces sand production.Through the application of the comprehensive sand production control technology,the sand production volume of Qingcheng shale oil horizontal wells is effectively reduced,and the normalized sand production volume of horizontal length is reduced year by year from 37.3 m3 in 2021 to 16.0 m3 in 2023 with the increase of proppant injection intensity,which provides a strong technical support for the post-fracturing productivity of Qingcheng shale oil horizontal wells.
作者
齐银
曹炜
陶亮
张同伍
吴江
鲜晟
贾煦亮
武安安
QI Yin;CAO Wei;TAO Liang;ZHANG Tongwu;WU Jiang;XIAN Cheng;JIA Xuliang;WU Anan(Oil&Gas Technology Research Institute,PetroChina Changqing Oilfield Company,Xi′an,Shaanxi 710018,China;Na-tional Engineering Laboratory for Exploration and Development of Low Permeability Oil&Gas Fields,Xi′an,Shaanxi 710018,China;Engineering Technology Department,PetroChina Changqing Oilfield Company,Xi′an,Shaanxi 710018,China)
出处
《钻采工艺》
北大核心
2025年第4期125-133,共9页
Drilling & Production Technology
基金
中石油集团公司攻关性应用性科技专项“非常规储层改造关键技术研究”课题4“多类型页岩油个性化压裂技术与试验”(编号:2023ZZ28YJ04)
长庆油田分公司关键核心技术攻关项目“鄂尔多斯盆地页岩油渗流机理及有效开发关键技术研究”(编号:2023DZZ04)。
关键词
页岩油
水平井
出砂
小粒径支撑剂
闷井时间
排液制度
shale oil
horizontal well
sand production
microproppant
shut-in time
flowback schedule
