A treatment method for deep well polysulfide mud drilling wastewater

A drilling wastewater and treatment method technology, applied in water/sludge/sewage treatment, water/sewage multi-stage treatment, oxidized water/sewage treatment, etc., can solve problems such as high content of suspended solids, long cycle, complex composition, etc. achieve high processing efficiency

Inactive Publication Date: 2011-12-28
CHINA PETROCHEMICAL CORP +1
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Problems solved by technology

[0002] In the process of deep well drilling, due to the influence of geothermal gradient and formation pressure gradient, in order to achieve safe and fast drilling, composite metal ion polysulfide anti-slump drilling fluid and high-temperature drilling fluid are generally used. The salt-resistant and temperature-resistant synthetic There are many types of treatment agents, high dosage, complex composition, high concentration of organic pollutants in wastewater, high content of suspended solids, and abnormally stable colloidal system
The conventional chemical coagulation treatment technology can realize the complete removal of suspended matter and oil, and the partial removal of chroma and organic matter content; further use of catalytic oxidation technology, the removal rate of chroma and organic matter does not change much, and the effect is not obvious; Adsorption and filtration technology can be used for deep removal, and the chroma can be removed, but the content of organic matter, that is, COD, still cannot meet the first-level technical requirements of the "Comprehensive Wastewater Discharge Standard" (GB8978-1996)
[0003] In order to achieve environmental protection standards for drilling wastewater, people began to use chemically enhanced destabilization coagulation/catalytic oxidation technology for treatment as early as the end of the 1980s. This typ

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  • A treatment method for deep well polysulfide mud drilling wastewater
  • A treatment method for deep well polysulfide mud drilling wastewater

Examples

Experimental program
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Embodiment 1

[0021] Embodiment 1: get the drilling waste water 10m of the 5600m well depth of certain well 3 , under stirring, add 200kg of coagulant aluminum sulfate, after mixing evenly, add lime to adjust the pH of the wastewater to neutral, add anionic polyacrylamide aqueous solution under slow stirring, the amount of addition is based on the occurrence of flocculent precipitation, and then carry out solidification liquid separation; the filtered treated water is subjected to secondary flocculation, and 50 kg of polyferric sulfate is added under stirring. Precipitation shall prevail, and then solid-liquid separation shall be carried out; the filtered water shall be subjected to adsorption treatment, and the filtered water shall be pumped into the adsorption reactor, and the flow rate shall be controlled at 8.0 m 3 / h, pH=5.0, operating pressure is 0.4Mpa; Adsorb the effluent for oxidation treatment, put 80kg of chlorate oxidant into the oxidation reactor, stir for 4 hours, and carry ou...

Embodiment 2

[0022] Embodiment 2: Get 10m of drilling waste water of the 6300m well depth of a certain well 3 , add 400kg of a mixture of aluminum sulfate and ferrous sulfate under stirring, the mass ratio of the two is 1:1, after mixing evenly, add lime to adjust the pH of the wastewater to 9.5, add anionic polyacrylamide aqueous solution under slow stirring, and its addition amount is The flocculent precipitation shall prevail, and then solid-liquid separation shall be carried out; the filtered treated water shall be subjected to secondary flocculation, and 50 kg of polyferric sulfate shall be added under stirring, and after a uniform reaction, the pH shall be adjusted to neutral with milk of lime, and cationic polyferric sulfate shall be added under slow stirring. Aqueous acrylamide solution, the amount added is subject to the occurrence of flocculent precipitation, and then solid-liquid separation is carried out; the filtered water is subjected to adsorption treatment, and the filtered ...

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Abstract

The invention relates to a treatment method for deep-well polysulfide slurry drilling waste water, belonging to the technology for treating waste water of oil and gas field. The method comprises the following steps of: (1) coagulation treatment: pumping the drilling waste water into a coagulation reactor, and orderly adding inorganic coagulant, coagulant aids and flocculating agent; (2) secondaryflocculation: pumping the waste water processed in the coagulation treatment step into a secondary flocculation reactor, and directly adding secondary flocculation flocculant, coagulant aids and flocculating agent; (3) absorption treatment: pumping the waste water processed in the flocculation step into an active carbon adsorptive filtration reactor; (4) oxidation treatment: pumping the water filtered by the active carbon into an oxidation reactor for oxidation, and adding oxidant. The method takes the active carbon absorption and the oxidation treatment with inorganic chlorate type strong oxidizer as technical core processes, each index of the treated water can meet the level-1 technical standard requirements of a 'comprehensive sewage discharge standard' GB8978-1996.

Description

technical field [0001] The invention relates to a treatment method for deep well polysulfide mud drilling wastewater, which belongs to oil and gas field wastewater treatment technology, in particular to an advanced treatment technology for deep well polysulfide mud drilling wastewater. Background technique [0002] In the process of deep well drilling, due to the influence of geothermal gradient and formation pressure gradient, in order to achieve safe and fast drilling, composite metal ion polysulfide anti-slump drilling fluid and high-temperature drilling fluid are generally used. The salt-resistant and temperature-resistant synthetic There are many types of treatment agents, high dosage, complex composition, high concentration of organic pollutants in wastewater, high content of suspended solids, and abnormally stable colloidal system. The conventional chemical coagulation treatment technology can realize the complete removal of suspended matter and oil, and the partial r...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/72C02F1/52
Inventor 何焕杰王兴武马金杨云鹏张淑侠詹适新马雅雅
Owner CHINA PETROCHEMICAL CORP
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