Abstract
Fracturing fluid is the blood of fracturing construction, which is very important for fracturing, which requires that fracturing fluid needs to have good performance. The three commonly used fracturing fluids for unconventional oil and gas reservoir transformation are: 1) Guar gum fracturing fluid; 2) Water-based emulsion slippery water fracturing fluid; 3) Oil-based emulsion slippery water fracturing fluid. In this paper, water samples and other experimental data provided by Mahu Oilfield are used to evaluate three different fracturing fluid systems in laboratory. The formulas of the three different fracturing fluid systems are: 1) Water-based emulsion slippery water fracturing fluid is clean slippery water fracturing fluid 0.1% JHFR-2D drag reducer + 0.2% JHFD-2 multifunctional additive; 2) Oil-based emulsion slippery water fracturing fluid 0.1% A agent + 0.2% B agent; 3) Guar gum fracturing fluid 0.1% guanidine gum + 0.5% drainage aid + 0.3% demulsifier. The compatibility, drag reduction performance, reservoir damage, residue content, anti-swelling performance, surface interfacial tension, viscosity and other properties of three different slippery water fracturing fluid systems were studied. Through laboratory experiments, the comprehensive indicators show that clean slippery water fracturing fluid has obvious advantages.
Highlights
The compatibility, drag reduction performance, reservoir damage, residue content, anti-swelling performance, surface tension, viscosity and other properties of three different fracturing fluid systems were evaluated in laboratory with water samples and other experimental materials provided by Mahu Oilfield
The clean slippery water fracturing fluid prepared by JHFR-2D and JHFD-2 had no flocculent and sedimentation phenomena, indicating that the two are well compatible.; The Oil-based emulsion slippery water fracturing fluid formulated with agent A and agent B produces a small amount of insoluble matter in suspended particles, indicating that the compatibility between the two is not good; the guanidine gum prepared with guar gum, drainage aid and demulsifier
1) The clean slippery water fracturing fluid shows good drag reduction performance in clear water or in different metal ions and its drag reduction effect is stable, which can reduce the pressure of fracturing construction and help to ensure the smooth progress of fracturing construction
Summary
Guanidine gum fracturing fluid and oil-based emulsion slickwater fracturing fluid have some shortcomings, such as high viscosity, poor drag reduction effect, high residue content, difficult oilfield sewage treatment, serious damage to tight reservoir caused by plugging pores, slow swelling speed of thickener, etc., which make them unable to better meet the requirements of large displacement construction. After fracturing with these two kinds of fracturing fluids, problems such as soft formation and rapid production decline often occur, so it is urgent to develop a slickwater fracturing fluid system with good drag reduction effect, quick dissolution and low damage.
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