一体化压裂液对佳县区块致密气储层伤害实验研究
Experimental study on damage of integrated fracturing fluid to tight gas reservoirs in Jiaxian block
卢军凯 1曾祺俊 2李云子 1罗成 1孙宏晶 1卢聪2
作者信息
- 1. 中国石油冀东油田分公司钻采工艺研究院 河北唐山 063000
- 2. 西南石油大学"油气藏地质及开发工程"全国重点实验室 四川成都 610500
- 折叠
摘要
为分析压裂液对J区块致密气储层的伤害,采用压裂液评价实验方法,从压裂液性能参数、对储层基质的伤害、对填砂裂缝伤害三个方面进行实验评价,研究了压裂液基液对致密储层基质和填砂裂缝的影响.结果表明,鄂尔多斯盆地J区块现场所用的一体化变黏压裂液对致密气储层的伤害率为 19.83%～29.32%,伤害还表现出渗透率越低岩心损害率越大的特征;随着返排压差的增大,压裂液对岩心的伤害程度明显降低,返排压差大于 6 MPa时,损害率降低缓慢,最大可降低至 10.96%;裂缝导流能力伤害率随着闭合应力逐渐增加,在高闭合应力条件下裂缝导流能力伤害程度大于低闭合应力条件;低铺砂浓度的裂缝导流能力对压裂液敏感性较强,相同条件下低铺砂浓度导流能力伤害率更大.研究为鄂尔多斯盆地J区块致密储层改造压裂液体系优化有一定实际意义.
Abstract
In order to analyze the damage of fracturing fluid to the tight gas reservoirs in J block,by using the fracturing fluid experi-mental evaluation method,experimental evaluation was performed from three aspects:fracturing fluid performance parameters,damage to reservoir matrix,and damage to proppant-filled fractures.And the influence of base fracturing fluid on the matrix and proppant-filled fractures of tight reservoirs was studied.The results show that the damage rate of the integrated viscosity variable fracturing fluid used in the J block of the Ordos Basin to tight gas reservoirs ranged from 19.83%to 29.32%,and the damage also showed the characteristic that the lower the permeability,the greater the core damage rate.With the increase of flowback pressure difference,the damage degree of fracturing fluid to the core decreased significantly.When the flowback pressure difference was greater than 6 MPa,the damage rate decreased slowly,with a maximum reduction to 10.96%.The damage rate to fracture conductivity increased gradually with the increase of closure stress,and the damage degree to fracture conductivity under high closure stress condition was greater than that under low closure stress condition.Fracture conductivity with low proppant concentration showed stronger sensitivity to fracturing fluid,and under the same conditions,the damage rate of fracture conductivity with low proppant concentration was greater.The research holds a certain practical significance in optimizing fracturing fluid system for the stimulation of tight reservoirs in the J block of the Ordos Basin.
关键词
鄂尔多斯盆地/致密气储层/一体化压裂液/渗透率/储层伤害/导流能力/返排压差Key words
Ordos Basin/tight gas reservoir/integrated fracturing fluid/permeability/reservoir damage/conductivity/flowback pressure difference引用本文复制引用
基金项目
中国石油冀东油田分公司科技项目(CY2022C01)
出版年
2024
NETL
NSTL
万方数据