Soy Protein Isolate As Fluid Loss Additive in Bentonite-Water-Based Drilling Fluids.
Wellbore instability and formation collapse caused by lost circulation are vital issues during well excavation in the oil industry. This study reports the novel utilization of soy protein isolate (SPI) as fluid loss additive in bentonite-water based drilling fluids (BT-WDFs) and describes how its particle size and concentration influence on the filtration property of SPI/BT-WDFs. It was found that high pressure homogenization (HPH)-treated SPI had superior filtration property over that of native SPI due to the improved ability for the plugging pore throat. HPH treatment also caused a significant change in the surface characteristic of SPI, leading to a considerable surface interaction with BT in aqueous solution. The concentration of SPI had a significant impact on the dispersion state of SPI/BT mixtures in aquesous solution. At low SPI concentrations, strong aggregations were created, resulting in the formation of thick, loose, high-porosity and high-permeability filter cakes and high fluid loss. At high SPI concentrations, intercatlated/exfoliated structures were generated, resulting in the formation of thin, compact, low-porosity and low-permeability filter cakes and low fluid loss. The SPI/BT-WDFs exhibited superior filtration property than pure BT-WDFs at the same solid concentraion, demonstrating the potential utilization of SPI as an effective, renewable, and biodegradable fluid loss reducer in well excavation applications.
School of Renewable Natural Resources, Louisiana State University AgCenter , Baton Rouge, Louisiana 70803, United States.
Mei-Chun
MC
Li
School of Renewable Natural Resources, Louisiana State University AgCenter , Baton Rouge, Louisiana 70803, United States.
Qinglin
Q
Wu
School of Renewable Natural Resources, Louisiana State University AgCenter , Baton Rouge, Louisiana 70803, United States.
Kunlin
K
Song
Department of Forest Products, Korea Forest Research Institute , Seoul, 130-712, Korea.
Sunyoung
S
Lee
Key Laboratory of Wood Science and Technology of Zhejiang Province, School of Engineering, Zhejiang Agriculture and Forestry University , Linan, 311300, Zhejiang, China.
Chunde
C
Jin
Key Biomass Energy Laboratory of Henan Province , Zhengzhou, 450008, Henan, China.
Suxia
S
Ren
Key Biomass Energy Laboratory of Henan Province , Zhengzhou, 450008, Henan, China.
Tingzhou
T
Lei
D001546:Bentonite / Q000737:chemistry*; D005374:Filtration / Q000379:methods*; D008855:Microscopy, Electron, Scanning; D000066388:Oil and Gas Industry; D010316:Particle Size; D010539:Permeability; D016062:Porosity; D011312:Pressure; D030262:Soybean Proteins / Q000737:chemistry*; D013499:Surface Properties; D014783:Viscosity; D014867:Water / Q000737:chemistry*
D030262:Soybean Proteins; D014867:Water; D001546:Bentonite
bentonite; filtration; fluid loss additive; soy protein isolate; water-based drilling fluids