Study of a physical-chemical composition influence of fresh water on the rheological properties of hydraulic fracturing fluids
UDC: 622.276.66
DOI: -
Authors:
NASYBULLIN A.V.
1,
ALENKIN I.A.1,
BUDKEVICH R.L.1,
KOCHETKOV A.V.2,
ZAKIROV R.R.1
1 Almetyevsk State Technological University "Petroleum Higher School", Almetyevsk, Russia
2 Tatneft PJSC named after V.D. Shashin, Almetyevsk, Russia
Keywords: rheological characteristics of a formation, hydraulic fracturing, fracturing fluid, fresh water, component composition, behavior index, consistency coefficient, recovery time
Annotation:
Hydraulic fracturing of a formation is one of the most effective methods of oil production intensification as well as, in many cases, oil recovery increase. At the same time, most hydraulic fracturing operations are performed using "crosslinked" polymer systems based on guar using borate crosslinkers. Such systems are mostly based on fresh water use, which contains various components. The rheological properties of the "crosslinked" fracturing fluids strongly depend on the water component composition. The authors of the article conduct rheological studies of rupture fluid samples, prepared on the basis of model distilled water with the addition of calcium ions, chlorine anions and bicarbonates. The research results prove the fact that when the concentration of calcium ions in water exceeds 650 mg/l, there observed an increase of the gel recovery time after exiting through the perforations of the tubing.
It has been proved that chlorine anions content in concentrations above 100 mg/l significantly increases the gel recovery time. It has been established that due to the insufficient viscosity of such a liquid, premature closure of cracks that are not filled with proppant can occur. There is a linear trend of degradation time decrease followed by the bicarbonate content increase in concentrations from 100 up to 1000 mg/l. Some aspects of fracturing fluids rheological characteristics, related to the behavior index and consistency coefficient, have been studied.
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