Microbiological treatment method for waste drilling fluid

A technology for microbial treatment and waste drilling fluid, applied in sustainable biological treatment, biological water/sewage treatment, mining wastewater treatment, etc. It can solve the problems of pollutant seepage, polluted land and water body, and large investment, and achieve enhanced degradation. Effect, COD value reduction, pollution reduction effect

Active Publication Date: 2016-12-07
SINOPEC SSC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the most commonly used waste drilling fluid treatment technology is solidification method. This technology usually adds a curing agent to convert the waste drilling fluid into a solid similar to soil or with high cementation strength, which can be buried in situ or used as building materials, etc., although in a short time However, most of the pollutants have not been eliminated, but are only fixed in the solidified block, and the solidified block is buried in the ground. After long-term effects of physics, chemistry, and biology, the pollutants seep out, causing re-contamination of soil and groundwater
At the same time, solidification treatment needs to add a large amount of destabilizing agent, coagulant aid, curing agent, etc., which not only increases the amount of waste discharge, but also consumes a large amount of materials, energy and labor costs, which will inevitably cause secondary pollution. A non-energy efficient disposal method
Furthermore, the solidified land cannot be cultivated, wasting precious land resources, and will continue to pollute the surrounding land and water with the seepage of pollutants
Therefore, the curing method has the disadvantages of incomplete treatment, large investment, and high cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Dispose of waste drilling fluid according to the following steps, including:

[0018] (1) Take a certain amount of clean water and heat it to 35°C in the reactor, add brown sugar with a weight ratio of 4%, stir and dissolve it, add bacteria with a weight ratio of 5%, close the reactor to keep it airtight, and maintain The culture was continued for 3 days at a temperature of 35° C. During the cultivation process, the generated gas was released from time to time until the pH value of the bacterial liquid reached 3.7, and the bacterial liquid culture was completed.

[0019] (2) Every time when drilling fluid is discharged to the waste slurry pool, spray and add 6% of the total slurry amount of bacterial solution, and stir evenly.

[0020] (3) Spray 2Kg of bacteria liquid evenly into the drill cuttings separated by the centrifuge once a day.

[0021] (4) After the drilling is completed, put the drilling fluid and drill cuttings treated in the above steps into the waste slu...

Embodiment 2

[0023] Dispose of waste drilling fluid according to the following steps, including:

[0024] (1) Take a certain amount of clean water and heat it to 35°C in the reaction kettle, add a mixture of brown sugar and white sugar with a weight ratio of 5% (among them, the mixing ratio of brown sugar and white sugar is 1.2:1), stir well and dissolve, then add For strains with a weight ratio of 5%, close the reactor to make it airtight, and maintain the temperature at 35°C for 3 days. During the cultivation process, the gas generated is released from time to time until the pH value of the bacterial liquid reaches 3.6, and the bacterial liquid cultivation is completed.

[0025] (2) Every time when drilling fluid is discharged to the waste slurry pool, spray and add 5% of the total slurry amount of bacterial solution, and stir evenly.

[0026] (3) Spray 2Kg of bacteria liquid evenly into the drill cuttings separated by the centrifuge once a day.

[0027] (4) After the drilling is comple...

Embodiment 3

[0029] Dispose of waste drilling fluid according to the following steps, including:

[0030] (1) Take a certain amount of clean water and heat it to 37°C in the reactor, add a mixture of brown sugar, white sugar and molasses with a weight ratio of 5% (among them, the mixing ratio of brown sugar, white sugar and molasses is 0.9:1.2:1), After fully stirring and dissolving, add bacteria with a weight ratio of 5%, close the reactor to make it airtight, and maintain the temperature at 35°C for 5 days. During the cultivation process, the gas generated is released from time to time until the pH value of the bacteria solution reaches 3.4. Bacterial culture is complete.

[0031] (2) Every time when drilling fluid is discharged to the waste slurry pool, spray and add 5% of the total slurry amount of bacterial solution, and stir evenly.

[0032] (3) Spray 2Kg of bacteria liquid evenly into the drill cuttings separated by the centrifuge once a day.

[0033] (4) After the drilling is com...

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PUM

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Abstract

The invention relates to the technical field of innocent treatment of waste drilling fluid, in particular to a microbiological treatment method for waste drilling fluid. Specific degrading bacteria and nutrient substances are introduced, organic pollutants and petroleum hydrocarbons in the waste drilling fluid are oxidized and decomposed through growth, breeding and metabolism activities of microorganisms, therefore, organic polymers are degraded into low molecules or gas capable of being accepted by the environment, and the aim of eliminating pollution is achieved. The microbiological treatment method for the waste drilling fluid comprises the steps of culturing a bacterium solution, mixing and spraying the bacterium solution into the drilling fluid, mixing and spraying the bacterium solution into drilling cuttings, carrying out backfill earthing, watering and seed scattering and the like.

Description

technical field [0001] The invention relates to the technical field of harmless treatment of waste drilling fluid, in particular to a microbial treatment method for waste drilling fluid. Background technique [0002] Waste drilling fluid is a major pollutant produced in the process of oilfield development. It has complex components, usually including clay, weighted materials, various chemical treatment agents, water, oil and drilling cuttings, etc. It is a complex multiphase stable colloidal suspension system , a considerable part of the chemical treatment agents have varying degrees of toxicity. If it is discharged directly without treatment, it will pollute the soil, the atmosphere, groundwater, etc., and endanger the environment. The realization of its harmless treatment is of great significance to the protection of the ecological environment and the health of animals and plants. [0003] At present, the most commonly used waste drilling fluid treatment technology is sol...

Claims

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Application Information

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IPC IPC(8): C02F3/34C02F103/10
CPCC02F3/347C02F3/348C02F2103/10Y02W10/10
Inventor 张冬玲刘宝双李军赵怀珍张志财季一冰罗云凤史涛慈国良马云谦
Owner SINOPEC SSC
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