Effect of Shear Flow on Drag Reducer Performance and Its Microscopic Working Mechanism

被引:2
|
作者
Liu, Zhiyu [1 ]
Tian, Zaifu [2 ]
Yuan, Haoren [2 ]
Li, Yuan [1 ]
Ge, Hongkui [1 ]
Zhou, Fujian [1 ]
机构
[1] China Univ Petr, State Key Lab Petr Resources & Engn, Beijing 102249, Peoples R China
[2] China Petrochemical Corp Sinopec Grp, Oil Prod Technol Res Inst, Shengli Oilfield Luming, Dongying 257000, Peoples R China
关键词
drag reducer for slick water fracturing fluid; shear failure; grain size distribution; rheological properties; micro-mechanism of shear failure; DILUTE POLYMER-SOLUTIONS; DEGRADATION; MACROMOLECULES; REDUCTION; SCISSION;
D O I
10.3390/pr10081485
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
As the development of unconventional oil and gas resources goes deeper, the stimulation of reservoirs goes deeper year by year. Flow in longer wellbores poses a challenge to the stability of drag-reduction performance of fracturing fluid. However, at present we have limited understanding of the mechanism of drag-reduction damage caused by shear flow, especially the microscopic mechanism. Therefore, in this work, the variation pattern of drag reducer solution performance with shear rate has been analyzed by using a high precision loop flow drag test system. The test results show that there is a critical shear rate for the performance damage of the drag reducer solution, and high strength shear flow and cumulative shear flow time are the main factors leading to the performance degeneration of the drag reducer. Based on the nanometer granularity distributions, rheological properties and microscopic structures observed with a transmission electron microscope of drag reducer solutions subjected to shear flows of different velocities, it is confirmed that the damage to the microscopic structure of the solution is the main reason leading to its performance degeneration. The destruction of the microscopic structure causes the drag reducer solution to degrade in non-Newtonian characteristics, so it becomes poorer in its capability of reducing turbulent dissipation and drops in drag-reduction capability. This research can provide a reference for improving and optimizing drag-reduction capability of fracturing fluid.
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页数:15
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