摘要
大牛地气田薄储层压裂井缝高失控严重,裂缝内有效支撑效率在50%以下,支撑剂利用率较低,影响裂缝导流能力和压后产量。针对此难题,文中开展了大牛地气田薄储层控缝高压裂工艺技术研究及应用。研究结果表明:通过改变排量和压裂液黏度,可以有效控制裂缝延伸。中黏、低黏压裂液在提高缝长方面具有明显优势,但低黏压裂液容易形成较窄的缝宽,前置液阶段可采用低+中黏压裂液组合,有效控制缝高,提高缝长和缝宽。开展了支撑剂组合加砂、变黏度多元组合、前置酸预处理和泵注模式优化等薄层配套压裂工艺研究,在有效控制缝高的同时,降低作业风险。研究成果在大牛地气田薄层水平井中取得显著效果,平均无阻流量为8.6×10^(4) m^(3)/d,初期平均产气量稳定在2.8×10^(4) m^(3)/d,较优化前提高了55%。
With the development of Daniudi gas field, the fracture height of thin-layer fracturing is out of control seriously, and the effective support efficiency in the fracture is below 50%. The low utilization rate of proppant affects the fracture conductivity and post fracturing production. In view of this problem, the research and application of the thin layer fracture-height controlled fracturing technology in Daniudi gas field were carried out. The results show that fracture extension can be effectively controlled by changing displacement and viscosity of fracturing fluid. Medium and low viscosity fracturing fluids have obvious advantages in improving the fracture length, but low viscosity fracturing fluids are easy to form narrow fracture width. The combination of low and medium viscosity fluids can be used in the pre fluid stage to effectively control the fracture height and improve the fracture length and width.Supporting thin-layer processes such as proppant combination sand adding process, variable viscosity multi-element combination process, pre acid pretreatment process and pump injection mode optimization process have been carried out, so as to effectively control the seam height and reduce the operation risk. The results have achieved significant effects in the thin layer horizontal well in Dniudi gas field. The average open flow rate is 8.6×104 m3/d, and the average daily gas production is stable at 2.8×104 m3/d at the initial stage, which is 55% higher than that before optimization.
作者
刘威
LIU Wei(Research Institute of Petroleum Engineering and Technology,North China Oil&Gas Company,SINOPEC,Zhengzhou 450006,China)
出处
《断块油气田》
CAS
CSCD
北大核心
2021年第2期284-288,共5页
Fault-Block Oil & Gas Field
基金
中国石化科技部科技项目“大牛地山西组未动用储量区高效压裂关键技术”(P19019-7)。
关键词
薄储层
控缝高压裂
压裂参数
支撑效率
大牛地气田
thin layer
fracture-height controlled fracturing
fracturing parameters
support efficiency
Daniudi gas field
