Nanomaterials-Enhanced High-Temperature Viscoelastic Surfactant VES Well Treatment Fluids
- Sehmus Ozden (Aramco Services Company: Aramco Research Center-Houston) | Leiming Li (Aramco Services Company: Aramco Research Center-Houston) | Ghaithan A. Al-Muntasheri (Saudi Aramco) | Feng Liang (Aramco Services Company: Aramco Research Center-Houston)
- Document ID
- Society of Petroleum Engineers
- SPE International Conference on Oilfield Chemistry, 3-5 April, Montgomery, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2017. Society of Petroleum Engineers
- 2.4 Hydraulic Fracturing, 2.6 Acidizing, 2 Well completion, 1.8 Formation Damage, 4.1.2 Separation and Treating, 4.1 Processing Systems and Design, 2.5.2 Fracturing Materials (Fluids, Proppant), 4 Facilities Design, Construction and Operation, 3 Production and Well Operations
- nanomaterial, VES, high temperature
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Nanomaterials are being implemented in more and more industries due to their unique properties and performances at the nanoscale. In the oilfield, nanomaterials can significantly improve the performances of well treatment fluids including hydraulic fracturing fluids. Fluids based on polymers such as polysaccharides are widely used in the oilfield as fracturing fluids, but these fluids can have some limitations. For example, high molecular weight and incomplete breaking of these polymers can cause serious formation damage.
An alternative material is viscoelastic surfactant (VES) which has been used for fracturing and acid jobs. VES-based fluids are low molecular weight in nature and show minimum formation and conductivity damage. Yet, there remain challenges associated with their use such as limited thermal stability and high leakoff rate. The use of nanomaterials such as MgO and ZnO was found to enhance their thermal stability and leakoff properties at temperatures up to 250°F. For wells with higher bottomhole temperatures, the nanomaterials that can significantly enhance the performances of the VES fluids at 350+°F will be much sought after.
In this paper, we report the use of a number of the selected nanomaterials to enhance the VES gels at temperatures up to 350°F or higher. In one example, the addition of about 0.1 wt% nanomaterial-I enhanced the viscosity of the VES fluid by about 24% averaged over the temperature range from 250 to 350°F. In another example, nanomaterial-II at a dose of about 0.04 wt% enhanced the viscosity of the VES fluid by about 23% averaged over the temperature range from 250 to 350°F. Additionally, measurements showed that the viscosity of the VES fluids remained above 110 cP (at 100 s-1 shear rate) for over two hours at 350°F with the addition of either nanomaterial-I or nanomaterial-II. The fluid stability at elevated temperatures could also be improved with the selection of other nanomaterials.
This paper will discuss the applications for these nanomaterials in hydraulic fracturing and other oilfield operations under high temperature conditions, based on the laboratory test results that will be shared in detail. This technology could open the door for more advancement in hydraulic fracturing with non-damaging VES systems at high temperatures.
|File Size||1 MB||Number of Pages||10|