摘要
为了提高川东地区凉高山组致密砂岩气藏工业产量,针对凉高山组致密砂岩气藏物性较差,前期开展大型体积压裂效果较差的问题,从体积压裂可行性分析、造长缝大型压裂可行性分析以及目标储层压裂方式3个方面开展了研究工作。研究表明:1)凉高山组储层物性差且脆性高,但天然裂缝欠发育,水平应力差异系数(0.18)较大,缝网形成难度大;储隔层应力差较小(2 MPa),缝高极易失控,不适合采用体积压裂模式。2)模拟发现,储隔层应力差、排量、压裂规模和压裂液黏度对凉高山组裂缝参数影响较大,需要适度控制排量(5 m^(3)/min以内)、压裂规模以及减小黏度(50 mPa·s以内)以控制缝高而造长缝,优选控缝高造长缝的压裂工艺作为凉高山组压裂工艺。3)提出了采用变排量(排量由2 m^(3)/min起步逐步提至5 m^(3)/min)、一级段塞停泵(停泵15 min)、控制排量和控制规模(单段液量为280~300 m^(3))等措施控缝高,推荐了典型施工泵注程序。以上成果认识为凉高山组储层后续开发具有指导价值。
In order to increase the industrial output of the tight sandstone gas reservoirs in the Lianggaoshan Formation in the eastern Sichuan area,in view of the poor physical properties of the tight sandstone gas reservoirs in the Lianggaoshan Formation and the poor effect of large-scale volume fracturing in the early stage,the research work is carried out in three aspects that is feasibility analysis of volume fracturing,feasibility analysis of large-scale fracturing of long fractures and fracturing methods of target reservoir.The research shows that:1)The reservoirs of Lianggaoshan Formation have poor physical properties and high brittleness,but the natural fractures are underdeveloped,the horizontal stress difference coefficient(0.18)is large,and the formation of fracture network is difficult;The stress difference between reservoirs and interlayers(2 MPa)is small,and the fracture height is easily out of control,so the volume fracturing mode is not suitable.2)The simulation found that the stress difference of reservoir and interlayer,displacement,fracturing scale and fracturing fluid viscosity have a great influence on the fracture parameters of Lianggaoshan Formation,and it is necessary to moderately control displacement(within 5 m^(3)/min),fracturing scale and reduce viscosity(within 50 mPa·s)to control fracture height to create long fractures,the fracturing process of controlling fracture height and creating long fractures is preferred as the fracturing process of the Lianggaoshan Formation.3)It is proposed to adopt variable displacement(starting from 2 m^(3)/min to gradually increase the displacement to 5 m^(3)/min),one-stage slug stop pump(stop pump for 15 min),control displacement and control scale(single-stage liquid volume is 280~300 m^(3))measures to control the joint height,and a typical construction pump injection procedure is recommended.The above achievements have guiding value for the subsequent development of Lianggaoshan Formation reservoirs.
作者
张凤琼
肖晖
陈依
余致理
李泉辉
张艳玲
彭刚
肖仁维
ZHANG Fengqiong;XIAO Hui;CHEN Yi;YU Zhili;LI Quanhui;ZHANG Yanling;PENG Gang;XIAO Renwei(Chongqing Gas Mine,Southwest Oil and Gas Field Branch,PetroChina,Chongqing 400021,China;School of Petroleum Engineering,Chongqing University of Science and Technology,Chongqing 401331,China)
出处
《非常规油气》
2023年第4期117-125,152,共10页
Unconventional Oil & Gas
基金
重庆市自然科学基金重点项目“深层页岩气压裂复杂裂缝形成机理及工艺技术研究”(cstc2020jcyj-zdxmX0001)
重庆市自然科学基金面上项目“页岩压裂楔形裂缝网络中支撑剂运移机理研究”(cstc2019jcyj-msxmX0069)
重庆英才计划包干制项目“页岩气区加密井压裂裂缝延伸规律研究”(cstc2021ycjh-bgzxm0207)。
关键词
致密砂岩
控缝高
造长缝
体积压裂
工艺优选
tight sandstone
fracture height control
create long fractures
volume fracturing
process optimization
