Rheological Performance of Potassium Formate Water-Based Muds for High-Temperature Wells

Since the surfactant can form rod-like micelles or even cross-link structures, viscoelastic surfactant (VES) fluid has unique rheological characteristics. The demerits of VES fluids have been proven after being applied as the fracturing fluid for several years. However, the fluid has high fluid loss and a low viscosity at high temperature, which limits the application to hydraulic fracturing. This paper focuses on the VES fluid mixed with nanoparticles which should be an effective way to maintain the viscosity at high temperature and high shear rate. The experiments were based on preparation of uniform and stable nanocolloids, which utilize Microfluidizer high shear fluid processor. Dynamic light scattering and microscopic methods are employed to investigate the stability and micro-structure of the VES fluid. The effects of temperature, shear rate and volume fraction of the nanoparticles on rheology of VES were studied. The SiO2 nanoparticles could significantly improve the rheological performance of VES fluid, although the rheological performance at the temperature over 90 °C needs to be enhanced. The mechanisms of interactions between nanoparticles and micelles are also discussed later in the paper. At the end, the potential of VES fluid mixed with nanoparticles during application in fracturing process was discussed.

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Effect of synthetic water-soluble polymers on the properties of the heavy water-based drilling fluid at high pressure-high temperature (HPHT) conditions

Journal of Petroleum Science and Engineering ◽

10.1016/j.petrol.2018.03.055 ◽

2018 ◽

Vol 166 ◽

pp. 850-856 ◽

Cited By ~ 14

Author(s):

Sanam Sepehri ◽

Rouhollah Soleyman ◽

Akbar Varamesh ◽

Majid Valizadeh ◽

Alireza Nasiri

Keyword(s):

High Pressure ◽

High Temperature ◽

Heavy Water ◽

Drilling Fluid ◽

Water Soluble ◽

Water Soluble Polymers ◽

Soluble Polymers ◽

High Pressure High Temperature ◽

Water Based ◽

Synthetic Water

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Not Too Hot to Handle: Water Based Fluid Drills High Temperature Wells (Russian)

10.2118/196796-ru ◽

2019 ◽

Author(s):

Rafael Pino ◽

Amr Abouhamed ◽

Ajay Addagalla ◽

Hesham El Dakroury

Keyword(s):

High Temperature ◽

Water Based

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Rheology and fluid loss of a polyacrylamide-based micro-gel particles in a water-based drilling fluid

Materials Express ◽

10.1166/mex.2020.1687 ◽

2020 ◽

Vol 10 (5) ◽

pp. 657-662

Author(s):

Gang Wang ◽

Honghai Fan ◽

Guancheng Jiang ◽

Wanjun Li ◽

Yu Ye ◽

...

Keyword(s):

Particle Size ◽

High Temperature ◽

Particle Size Distribution ◽

Size Distribution ◽

Drilling Fluid ◽

Crosslinking Agent ◽

Fluid Loss ◽

Temperature Property ◽

Water Based ◽

The Cross

In this paper, the cross-linked micro-gel polymer between acrylamide (AM) and N, N-Methylenebisacrylamide (MBA) was synthesized by dispersion polymerization. The initiator and crosslinking agent concentration were used to control the particle size of micro-gel polymer. The filtration property and mechanism of micro-gel were investigated comprehensively. The characteristics of micro-gel were checked by means of Fourier transform infrared spectroscopy, thermogravimetry, transmission electron microscopy, and particle size distribution, respectively. The results indicated that the cross-linked micro-gel polymer exhibited several outstanding merits, such as thermal stability (up to 200 °C), filtration control and rheological property. Microstructure analysis and particle size distribution examinations showed that the scale of micro-gel polymer was micro, which is in accord with design. Rheological tests demonstrated that the nonlinear structure of micro-gel polymer showed less impact on the apparent viscosity. The anti-high temperature property of micro-gel polymer was better than poly anioniccellulose (PAC) and asphalt widely applied in drilling fluid for anti-high temperature fluid-loss additive. As a result, the cross-linked micro-gel polymer had great potential to be applied in high temperature water-based mud.

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