高气油比致密油藏吞吐排采优化实验研究
Experimental study on optimization of huff-and-puff drainage in tight oil reservoirs with high gas-oil ratio
侯克期 1李太伟 1钱志鸿 1吴婷1
作者信息
- 1. 中国石化江苏油田分公司石油工程技术研究院,江苏 扬州 225009
- 折叠
摘要
为优化高气油比致密油藏吞吐排采制度,选取XZ区块(气油比165 m3/m3)致密油,采用室内物理模拟手段研究致密油在不同压力条件下原油黏度的变化特征及渗流影响规律,得到合理生产压差,开展吞吐补能实验,分析注入时机、焖井时间、注入量等参数对致密油藏采出程度的影响,得出合理的吞吐工艺排采制度,指导高气油比致密油藏的高效开发.结果表明:高气油比致密油藏在生产过程中,随着地层压力的不断降低,等渗点向左移动.在含水饱和度45%、地层压力降低到饱和压力值的60%时,油的相对渗透率减少10%.对于吞吐补能排采制度,建议在压力下降至饱和压力附近时进行注水吞吐,焖井时间48～55 h,每轮次注入量0.4～0.6 PV,5～6 MPa生产压差更优.
Abstract
In order to optimize the huff-and-puff production strategy for tight oil reservoirs with high gas-oil ratios,tight oil from block XZ(with a gas-oil ratio of 165 m3/m3)was selected for indoor physical simulation studies.The research focused on the changes in crude oil viscosity and seepage effects of tight oil under different pressure conditions.A reasonable production pressure difference was obtained,and huff-and-puff energy supplementation experiments were conducted to analyze the effects of injection timing,soaking time,injection volume,and other parameters on the recovery degree of tight oil reservoirs.A reasonable huff-and-puff production strategy was developed to guide the efficient development of tight oil reservoirs with high gas-oil ratios.The results show that during the production process of tight oil reservoirs with high gas-oil ratios,as the formation pressure continues to decrease,the iso-permeability point moves to the left.When the water saturation is 45%and the formation pressure drops to 60%saturation pressure,the relative permeability of oil decreases by 10%.For the strategy of energy supplementation production through huff-and-puff,it is recommended to perform water injection and huffing when the pressure drops to near saturation pressure,with a soaking time of 48 to 55 hours,an injection volume of 0.4 to 0.6 PV per cycle,and a production pressure difference of 5 to 6 MPa for better production.
关键词
致密油藏/高气油比/吞吐/排采制度Key words
tight oil reservoirs/high gas-oil ratio/huff-and-puff/drainage system引用本文复制引用
出版年
2024
NETL
NSTL
万方数据