WP-322 is a kind of macromolecule polymer obtained by microbial fermentation with starch as raw material. The polymer is similar to the known xanthan gum property, but its aqueous solution stability is better than xanthan gum, showing high temperature, Resistant to high salt, acid and alkali, the use of a wide range of pH, high shear resistance, good water retention. Based on the above excellent performance, WP-322 main components in the food, medicine, cosmetics, oil extraction, ceramics, coatings and other applications of concern. The WP-322 molecule in the aqueous solution mainly depends on the van der Waals force in the molecule, and the side chain and the main chain depend on the hydrogen bond.
 First, WP-322 features
(1) unique rheological, pseudoplastic
WP-322 solution is a typical pseudoplastic fluid. At high shear rate, the polymer structure is depolymerized into a random coil structure to reduce the viscosity rapidly. When the shear rate is released, the molecular structure is restored to the polymer State, so that the solution viscosity instantly restored to the maximum. This pseudoplastic fluid is used in the petroleum industry to reflect the characteristics of mixing and mixing with high solids when it is easy to pump and pour.
(2) low viscosity with high viscosity
WP-322 can be dissolved in cold water, in the aqueous solution to show a regular, stable structure. Compared with other polysaccharide solution, low concentration of WP-322 aqueous solution can get a higher viscosity, 25 ℃ 1.0% aqueous solution viscosity of 600-1000mPa.s.
(3) good thermal stability
WP-322 aqueous solution in the temperature range of 10-140 ℃ viscosity change is not significant, 140 ℃ above the viscosity is generally maintained constant. The results show that the change of the viscosity is due to the change of the molecular conformation of the WP-322 main component in the aqueous solution, from the rigid rod to the irregular coil, and the transition temperature is about 130 ℃. And the solution temperature is lower than 5 ° C, and the solution is in a gel state.
WP-322 molecules in the aqueous solution with a rigid rod-shaped three-helix structure, it has excellent thermal degradation performance. It has been reported that at 105 ℃, pH 4.5-7.5, WP-322 aqueous solution to maintain viscosity within 100 days unchanged, 460 days after the viscosity retention rate is still as high as 80-90%. This high temperature resistance in oil drilling and deep well flooding has a very important role, the application prospect is broad.
(4) acid and alkali stability
In a wide pH range (1-11), the solution viscosity remained essentially constant at pH up to 12
On, the viscosity suddenly drops. WP-322 aqueous solution is very stable in the conventional pH range.
(5) good salt resistance
WP-322 molecules do not contain ionic groups, the viscosity of its aqueous solution from the inorganic salt concentration. With a variety of inorganic salts such as calcium, magnesium salt, etc. have good compatibility and stability. Can be used in the field of high salinity water preparation drilling fluid or do oil flooding agent.
(6) has a wide range of compatibility, good compatibility
WP-322 and other adhesives are very good compatibility, with most synthetic or natural thickener compatibility, mixed viscosity increased significantly. 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) has a strong anti-oxidation and anti-enzymatic action, a certain period of time to maintain the basic stability of the viscosity.
(8) Adhesive: below 10 ℃, WP-322 aqueous solution was semi-colloidal state, heated or shaking agitation when this state that disappeared.
 Second, WP-322 as a new microbial fermentation products used in oil fields, has the following advantages:
One is environmentally friendly: can be completely biodegradable, non-toxic to the human body, will not cause environmental pollution;
Second, the source of raw materials: microbial culture medium or into the formation of the material are the source of biosynthetic products;
Three is not to damage the formation: the use of fermentation broth or dry powder configuration solution will not cause damage to the formation near the wells;
Fourth, less investment in equipment, polymer flooding into the system only need to have a slight flood control water injection system can be achieved,
Do not need a lot of equipment investment;
 Five is the low cost: the fermentation broth inactivated and after the anti-corrosion treatment, directly as a flooding agent, in the production scale at the same time, can make production costs and use costs significantly reduced.
Third, WP-322 product characteristics indicators
  Ordinary powder
 ⊙ loose density: 670kg / m3 ⊙ Appearance: white or slightly yellow powder
⊙ Odor: Odorless ⊙ pH: 6.8-7.5 (1% aqueous solution)
⊙ particle size: 95% through 80 ⊙ viscosity (concentration of 1% aqueous solution, Brookfield viscometer 25 ℃ 3 # rotor, 60rpm):> 600mPa.s
⊙ water solubility: the dissolution rate is slow, need high shear to help dissolve
     2. ordinary type of liquid
     ⊙ Appearance: uniform thick yellow or milky white liquid
⊙ liquidity: few non-liquidity or poor mobility
     ⊙ Odor: a touch of grass smell, but no corrupt odor ⊙ active ingredient content: ≥ 2.5%
     ⊙ Viscosity:> 3000mPa.s (Brookfield viscometer, 4 # rotor, 60rpm, 25 ° C)
     3. Reinforced powder
     ⊙ loose density of 700kg / m3 ⊙ Appearance: milky white powder ⊙ Odor: no specific smell
     ⊙pH: 6.8-7.2 (1% aqueous solution) ⊙ particle size: 60-100 head ⊙ viscosity:> 700mPa.s
     ⊙ water solubility: dissolution speed, 10min up to 98% of the maximum viscosity value.
Third, usage and storage
1. Powder: whether ordinary or enhanced type, can be used tap water or mineralized water to dissolve the configuration, the general type takes a long time soaking, so that full water swelling, with high shear equipment whipping, and ultimately the formation of uniform Viscous solution; enhanced powder can be directly with the mixing device in the container while stirring edge, and quickly dissolve. The liquid has been made, such as for a long time, need to add preservatives to extend the storage cycle.
2. Dosage: the need for viscosity and water ratio of any mixture, the use of pump cycle to mix, stop the pump can be; has been anti-corrosion treatment, but still have to be stored in a cool dry place.
Fourth, the implementation of standards: Q / 371523QLS 001-2017
1, sensory indicators

2, physical and chemical indicators

At present, the company's liquid foam stabilizer WP-322 has been applied in the oil field.