永川北区页岩气超高强度加砂压裂工艺技术探索  

Exploration of ultra high strength sand fracturing technology for shale gas in Yongchuan north district

作　　者：王兴文[1] 刘琦[1] 王峻峰 穆轲帆 WANG Xingwen;LIU Qi;WANG Junfeng;MU Kefan(Petroleum Engineering Technology Research Institute of Southwest Oil and Gas Branch,SINOPEC,Deyang Sichuan 618000,China)

机构地区：[1]中国石化西南油气分公司石油工程技术研究院,四川德阳618000

出　　处：《石油化工应用》2024年第4期32-37,共6页Petrochemical Industry Application

基　　金：中国石化科技部项目“威荣深层页岩气立体开发优化技术研究”(P22041)。

摘　　要：永川北区页岩气田位于重庆市,开发层系为志留系五峰组-龙马溪组,埋深4100 m左右,目前处于开发评价阶段。储层具有高应力、高破裂压力、高闭合压力、天然裂缝发育程度低等特征,面临难以形成复杂人工裂缝网络、加砂难度大、高导流能力难保持等问题。本文通过支撑剂输送机理研究,明确了支撑剂粒径、液体黏度和施工排量是影响加砂难度的重要因素,提出了相应的强加砂工艺措施。应用于水平井YY2-2井,单段加砂强度最高7.70 t/m,平均5.82 t/m,综合砂比提升至10.2%。压后评估表明,超高强度加砂压裂工艺技术大幅提高了改造体积和人工裂缝复杂程度,初期试采效果远超前期实施井。为永川北区产能建设提供了支撑,同时为类似深层页岩气的有效开发提供了技术借鉴。The northern area of Yongchuan shale gasfield is located in Chongqing,the de-velopment layer is composed of the silurian Wufeng formation-Longmaxi formation,buried at a depth of about 4100 m,currently in the development evaluation stage.The reservoir has high stress,high fracture pressure,high closure pressure,and low degree of natural crack de-velopment,faced with difficulties in forming complex artificial fracture networks,difficulty in adding sand,and difficulty in maintaining high diversion capacity.This article studies the transportation mechanism of proppants and clarifies that the particle size,liquid viscosity,and construction displacement of proppants are important factors affecting the difficulty of sand addition.Corresponding technical measures for ultra high strength sand fracturing are proposed.Applied to the horizontal well YY2-2,the maximum sand addition strength of a single section is 7.70 t/m,and the average is 5.82 t/m,the comprehensive sand ratio is in-creased to 10.2%.The post fracturing evaluation shows that the ultra high strength sand frac-turing technology has significantly improved the volume of transformation and the complexity of artificial fractures,and the initial trial production effect is far superior to the well imple-mentation in the early stage.This provides support for the construction of production capaci-ty in the north district of Yongchuan,and also provides technical references for the effective development of similar deep shale gas.

关 键 词：页岩气 加砂强度 加砂难度 超高强度 水平井 

分 类 号：TE357.13[石油与天然气工程—油气田开发工程]