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56 results about "Dose interval" patented technology

Dose interval definition, dose interval meaning | English dictionary. dose. n a quantity that expresses the probability that exposure to ionizing radiation will cause biological effects. It is usually obtained by multiplying the dose by the quality factor of the radiation, but other factors may be considered.

Preparation of SRB (sulfate reducing bacterium) biological inhibitor and method for inhibiting SRB in crude oil

The invention relates to a preparation method of an SRB (sulfate reducing bacterium) biological inhibitor, which comprises the following steps: by taking polyvinyl alcohol, sodium alginate, denitrifying bacterium suspension, calcium carbonate, boric acid, calcium chloride, silicon dioxide and water as raw materials, preparing an embedding agent, then preparing a microbial mixed solution, and finally preparing to obtain immobilized denitrifying bacterium balls. The prepared SRB biological inhibitor can be used in the inhibition of SRB in crude oil. Sodium nitrate particles are firstly added into an oil well casing port; then, the SRB biological inhibitor is added; and finally, water is added to flush the two chemicals to the bottom of a well, and the dosing interval of each time is 15 days, thus achieving the purpose of inhibiting the growth of SRB for a long time. According to the invention, by using the sodium nitrate particles to provide a nitrogen source for the denitrifying bacteria, an oil layer origin and exogenous denitrifying bacterium microorganisms are activated, and the original and exogenous microorganisms are utilized to change the growth environment of the system so as to quickly inhibit the growth of SRB in the oil well, thereby inhibiting the generation of hydrogen sulfide gas from the source and reducing corrosion and sulfide hazard caused by SRB.
Owner:SHAANXI URSTAR ENVIRONMENTAL SCI & TECH
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