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CN-122012138-A - Biological oil removal and sulfur removal composite method and crude oil associated gas biological oil removal and sulfur removal method

CN122012138ACN 122012138 ACN122012138 ACN 122012138ACN-122012138-A

Abstract

The invention relates to the technical field of environmental microorganisms, in particular to a biological degreasing and sulfur removal compound method and a crude oil associated gas biological degreasing and sulfur removal method. The method has the advantages of low cost, simple operation, good effect, environmental protection and the like, can efficiently remove the crude oil and sulfur in the liquid containing the sulfide and the crude oil, and is a green and sustainable environmental treatment technology.

Inventors

  • YANG FAN
  • LI HANZHOU
  • WANG BIAO
  • QIAN ZHIHONG
  • WANG ZHIMING
  • MENG ZHANGJIN

Assignees

  • 中国石油化工股份有限公司
  • 中国石油化工股份有限公司江苏油田分公司

Dates

Publication Date
20260512
Application Date
20241112

Claims (10)

  1. 1. The biological degreasing and sulfur removal composite method is characterized by comprising the following steps: (1) Contacting a liquid comprising sulfide and crude oil with a system comprising oil bacteria; (2) Mixing the product of step (1) with a system containing desulphurisation bacteria.
  2. 2. The compounding method of claim 1, wherein, The deoiling bacteria-containing system contains a pseudomonas aeruginosa (Pseudonmonas aeruginosa) strain G028, and the preservation number of the pseudomonas aeruginosa is CGMCC No.9039.
  3. 3. The compounding method according to claim 1 or 2, wherein, The system containing the desulphurisation bacteria contains one or more of a bacillus thermal denitrificans (Geobacillus thermodenitrificans) strain and a bacillus composts (Geobacillus toebii) strain.
  4. 4. The compounding method according to claim 1 to 3, wherein, The thermal denitrifying geobacillus comprises a thermal denitrifying geobacillus strain JSHD-2 with a preservation number of CGMCC No.7271 and/or The bacillus composts comprise bacillus composts strains JSHD-4, and the preservation number is CGMCC No.7273.
  5. 5. The compounding method according to any one of claims 1 to 4, wherein, After contacting the sulfide and crude oil containing liquid with a system containing deoiling agent, the concentration of deoiling agent is 10 7 -10 8 cfu/mL, and/or The system containing the deoiling agent is 0.1% -5% of the total volume of the liquid.
  6. 6. The compounding method according to any one of claims 1-5, wherein, After the product of the step (1) is mixed with a system containing desulphurisation bacteria, the concentration of the desulphurisation bacteria is 10 7 -10 8 cfu/mL, and/or The system containing the desulphurisation bacteria is 1% -5% of the total volume of the product of the step (1).
  7. 7. The compounding method according to any one of claims 1-6, wherein, In step (1), the contacting conditions include a temperature of 30-37 ℃ and/or a pH of 7.5-8.5, and/or The crude oil content in the product obtained in the step (1) is not higher than 30mg/L, preferably 5-20mg/L, and/or In step (2), the mixing conditions include a temperature of 30-37 ℃ and/or a pH of 7.5-8.5.
  8. 8. The compounding method according to any one of claims 1-7, wherein, The sulfide is selected from sulfide of IA group metal element and/or hydrosulfide of IA group metal element, preferably one or more of sodium sulfide and sodium hydrosulfide, and/or Sulfide and crude oil containing liquid, the sulfide content is 50-200mg/L calculated by sulfur element, and/or The content of crude oil is 5-80mg/L.
  9. 9. A method for biologically removing oil and sulfur from crude oil associated gas, which is characterized by comprising the following steps: (I) Contacting crude oil associated gas with alkali liquor to obtain alkaline liquid containing sulfide and crude oil; (II) degreasing and desulphurisation of alkaline liquids containing sulphide and crude oil according to the compounding process of any one of claims 1-8.
  10. 10. The method of claim 9, wherein, The flow rate of crude oil associated gas is 40-60m 3 /h, and/or The concentration of the alkali liquor is 30-40g/L, preferably, the alkali in the alkali liquor is selected from one or more of alkali metal hydroxide, carbonate and bicarbonate, and/or The contact conditions include a temperature of 30-37 ℃.

Description

Biological oil removal and sulfur removal composite method and crude oil associated gas biological oil removal and sulfur removal method Technical Field The invention relates to the technical field of environmental microorganisms, in particular to a biological oil removal and sulfur removal compound method and a crude oil associated gas biological oil removal and sulfur removal method. Background Crude oil associated gas refers to natural gas produced from the subsurface along with crude oil during oil recovery. This gas is mainly composed of hydrocarbons such as methane and ethane, but may also contain some non-hydrocarbon components such as hydrogen sulfide and carbon dioxide. Hydrogen sulfide is a particularly detrimental component in associated gas. Hydrogen sulfide is a colorless, highly toxic, acid gas with a strong pungent odor. It has great harm to human health, and even low concentration hydrogen sulfide can stimulate eyes and respiratory tract to cause headache, nausea, vomiting, etc. and high concentration hydrogen sulfide can cause coma and even death. In addition, hydrogen sulfide can also cause corrosion to metal equipment, shorten equipment service life, and increase the cost of oilfield exploitation and production. Associated gas, if directly discharged untreated, can also cause serious pollution to the environment. The recycling of crude oil associated gas is an important link of petroleum development industry, the associated gas in the early industry mostly adopts modes such as emptying combustion, so that the environment is polluted, great waste is caused to energy, the associated gas is gradually treated in a recycling mode along with the maturity of development technology, but the associated gas also has the difficulties of high cost, high difficulty, hydrogen sulfide and the like. At present, some associated gas oil removal devices mainly remove light hydrocarbon crude oil in associated gas through methods such as centrifugation, filtration, cooling and the like. These devices have the disadvantages of high energy consumption, periodic consumable replacement, and the like. Disclosure of Invention The inventor finds that the conventional desulfurization technology of the oil field mainly comprises wet desulfurization and dry desulfurization, and biological desulfurization is gradually applied to crude oil associated gas, but a small amount of crude oil in the associated gas has a great influence on desulfurization microorganisms, and how to remove the crude oil in the associated gas is a key to a biological desulfurization system. In order to solve the problem that crude oil possibly contained in associated gas has a large influence on a biological desulfurization system in the biological desulfurization method of associated gas in the prior art, the invention provides a biological oil removal and sulfur removal composite method and a crude oil associated gas biological oil removal and sulfur removal method. In order to achieve the above object, a first aspect of the present invention provides a biological degreasing and desulfurizing composite method, which comprises: (1) Contacting a liquid comprising sulfide and crude oil with a system comprising oil bacteria; (2) Mixing the product of step (1) with a system containing desulphurisation bacteria. The second aspect of the invention provides a method for biological oil removal and sulfur removal of crude oil associated gas, which comprises the following steps: (I) Contacting crude oil associated gas with alkali liquor to obtain alkaline liquid containing sulfide and crude oil; (II) degreasing and desulfurizing alkaline liquid containing sulfide and crude oil according to the composite method of the invention. Through the technical scheme, the biological oil removal and sulfur removal composite method can effectively remove crude oil and sulfur in the liquid containing sulfides and crude oil. The method is characterized in that the method is used for removing oil from a system containing deoiling bacteria and desulfurizing the system containing desulfurizing bacteria by adopting a composite method after absorbing crude oil and sulfides in the crude oil associated gas through alkali liquor, so that crude oil in liquid is effectively removed, the influence on the desulfurizing bacteria in the system containing the desulfurizing bacteria is reduced, and the effective desulfurization of the crude oil associated gas is realized. Preservation of organisms The pseudomonas aeruginosa (Pseudonmonas aeruginosa) strain G028 provided by the invention is preserved in China general microbiological culture Collection center (preservation address is North Star Xway No.1, 3 of the Korean area of Beijing, national academy of sciences microbiological institute, post code 100101) (the preservation unit is abbreviated as CGMCC) in 4 and 11 days of 2014, and the preservation number is CGMCC No.9039. The strain JSHD-2 of the geobacillus thermocarborescens (Geo