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The novel biotol polysaccharide SS is a water-soluble extracellular polymer polysaccharide polymer produced by microbial fermentation. The molecular skeleton is composed of units of D-glucose, D-glucuronic acid and L-rhamnose, and its relative molecular weight is about 8 × 106. The new aqueous solution of polysaccharide SS has similar properties to that of xanthan gum aqueous solution, that is, significant shear thinning property and good rheological properties. The comparison shows that the new biological polysaccharide SS has higher solution viscoelasticity compared with xanthan gum And viscosity stability, therefore, it is mainly used as thickeners, suspending agents, emulsifiers, stabilizers, lubricants, film formers and adhesives in the oil industry has a good application effect.
First, the new biological polysaccharide SS product characteristics
1, excellent water solubility and rheological properties
The new biological polysaccharide SS has good water solubility and its aqueous solution has high viscoelasticity, which has a high viscosity at a low concentration, a viscosity of up to 3300 mPa.s at 1.0% of the aqueous solution at 25 ° C, which is twice that of xanthan gum , Gelatin 100 times.
2, strong pseudoplastic
The new bio-polysaccharide SS aqueous solution has good shear thinning property, and the higher the concentration, the greater the thinning strength.
3, good thermal stability
The viscoelasticity of the aqueous solution of the new biological polysaccharide SS is good for the thermal stability, and the apparent viscosity change in the range of 25 ~ 100 ℃ is very small, which is not affected by the temperature. Even at very low concentrations, its aqueous solution also has good thermal stability.
4, resistant to acid and alkali (pH) wide range
The new type of biological polysaccharide SS in the pH range of 2 to 12, the apparent viscosity of aqueous solution does not change with the pH changes.
5, good salt tolerance
The new polysaccharide SS has good salt tolerance, compatibility with most salts, and good compatibility and stability in the presence of multiple salts. In the presence of high concentrations of carbohydrates, can also maintain a stable thickening system.
6, good description and compatibility
The new bio-polysaccharide SS has good compatibility with other colloids and can be compatible with most synthetic or natural thickeners, and the viscosity increases significantly after mixing. For example, when it is used in combination with xanthan gum, it exhibits a strong synergistic thickening effect, and the resistance to salt resistance is not affected.
7, good suspension and emulsification
The new biological polysaccharide SS aqueous solution has the characteristics of pseudoplastic fluid (stirring effect), the static state has a good suspension function, and the nature of stability. In the industrial production can be used as an excellent suspension stabilizer, in addition to the thickening of SS can reduce the oil phase and the water phase incompatibility, which play the role of emulsification.
8, good biological, environmental safety
The new biological polysaccharide SS is a biopolymer produced by microbial fermentation of natural raw materials, which is non-toxic and biodegradable and has good environmental friendliness.
Second, the application of new biological polysaccharide SS in the petroleum industry
1, as the oil field drive aids
SS products with its good thickening, emulsification, suspension, stability and environmental protection of many characteristics, is very suitable for the current three times in the oil recovery agent. SS thickening emulsification characteristics, especially with the surfactant compound can significantly improve the displacement of the liquid and crude oil flow, improve the efficiency of displacement and reduce the flow resistance of crude oil to improve oil recovery; the other as a macromolecule charged material, It can block the certain large pore through the agglomeration effect, improve the homogeneity of the oil layer, make the displacement liquid flow to the residual oil area or the non-oil zone, to achieve the goal of increasing production and stabilizing. SS products are biodegradable environmentally friendly biopolymers, which can be rapidly degraded into small molecules bioavailable monosaccharides with the recovered fluid back to the ground, without any adverse effects on the formation and environment of the oil field.
2, as drilling aids - oil drilling fluid, completion fluid, workover fluid
SS products Good and stable rheological properties for the solid suspension and pump fluid to adjust the viscosity;
SS products of the strong pseudoplastic, in the high-speed bit parts of the viscosity is minimal, while protecting the drill bit to save power consumption, while in the relatively static drilling parts remain high viscosity, so as to effectively prevent the collapse of the shaft;
In addition, SS products in salt, acid, high salinity, high temperature and other aspects of excellent characteristics, in the harsh environment of higher tolerance, so that it can also meet the marine reservoirs, high salt area Extreme environment for drilling fluid requirements.
3, as the oil fracturing aid - oil fracturing fluid
SS products as a thickening agent in the fracturing fluid system, with the addition of small, high stability, sediment-carrying capacity of the characteristics of the existing melon-based fracturing fluid system, with a stable source of products, Price stability, performance and stability of the outstanding advantages.
Third, the implementation of standards: Q / 371523QLS 002-2016

Technical indicators

Project	Indicators
Exterior	Yellow viscous liquid
Solid content /% ≥	1.5
pH value	4-7
Crude polysaccharide SS content /% ≥	1.3
Apparent viscosity / mPa.s ≥	5000
10% Diluent viscosity / mPa.s ≥	100
10% salinity water (70000ppm) diluent viscosity / mPa ? s ≥	90
10% dilution90 ℃to maintain 30min viscosity / mPa.s ≥	75

At present, the company's biosurfactant SS has been used in the field.