Abstract
The Sulige gas field is a typical low-pressure low-permeability tight sandstone gas reservoir. The reservoir has poor seepage capacity, strong heterogeneity, high mineralization of formation water and extremely scarce water resources on the site. These unfavorable factors have brought great difficulties to the on-site mining process. Now, a nano-composite green environmental protection slick water fracturing fluid system CQFR can be quickly dissolved because of the larger specific surface area, and the small molecular size makes the damage to the reservoir less than 5%, and the average drag reduction effect can reach more than 73%. It can quickly and well dissolve and maintain performance under high salinity conditions and fracturing flowback fluids. It responds well to the complex reservoir conditions on the construction site and makes the flowback fluid recyable, which greatly reduces the consumption of water resources on the construction site and effectively improves the construction efficiency and economic benefits.
Highlights
IntroductionIt is generally found in low-permeability gas-bearing formations in various basins around the world
A nano-composite green environmental protection slick water fracturing fluid system CQFR can be quickly dissolved because of the larger specific surface area, and the small molecular size makes the damage to the reservoir less than 5%, and the average drag reduction effect can reach more than 73%
1) The reservoirs in the Sulige area of Changqing Oilfield are of low pressure, low permeability, and low abundance
Summary
It is generally found in low-permeability gas-bearing formations in various basins around the world. Current research indicates that China’s tight sandstone gas reservoirs are widely distributed and have great development potential [1] [2] [3]. Accelerating the research, development and utilization of tight sandstone gas resources is of great strategic significance for China’s energy security
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