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Method for treating waste sludge in oil and natural gas exploration drilling operations

A technology for oil and natural gas, exploration drilling, applied in biological sludge treatment and other directions, can solve problems such as incompatibility with energy-saving policies, consumption of large solidified materials, hazards, etc., to achieve the effect of retaining farming value and ensuring sustainable development

Active Publication Date: 2010-08-11
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, since waste sludge contains a large amount of organic and inorganic pollutants, direct landfilling will cause serious pollution and harm to surface water, groundwater and soil; the solidification treatment method can basically solve the pollution hazard of waste sludge in a short period of time, but in the long run From the point of view, if the solidified block is buried underground for a long time, a series of changes will occur in the waste drilling mud inside it, which will cause pollution to the soil environment; and the solidified land will also lose its cultivation value, and this treatment method will consume a lot of waste. The solidified materials with cement as the main body are increasingly unsuitable for the development of national energy-saving policies

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Embodiment 1

[0026] The method discloses a method for treating waste sludge in oil and gas exploration and drilling operations. The steps include:

[0027] a. Microbial treatment: add special microbial strains to the waste sludge in a weight ratio of 5:100 and mix evenly; and add natural soil to the waste sludge mixed with special microbial strains in a weight ratio of 2:1 In, mix evenly, thereby form microbial treatment layer 1; Described special-purpose microbial strain is Halomonas ventosae bacterium, Halomonas campisalis bacterium in Halomonas, and Bacillus megaterium (Bacillus megaterium) in Bacillus;

[0028] B, soil treatment: the microbial treatment layer 1 surface that forms in a step, covers the natural soil of 10-15cm, forms the soil treatment layer 2;

[0029] c. Plant treatment: On the surface of the soil treatment layer 2, plant leguminous and non-legume symbiotic nitrogen-fixing tree species, or plant herbaceous plants to form the plant treatment layer 3 .

Embodiment 2

[0031] As a preferred embodiment of the present invention, on the basis of Example 1, in step c, the leguminous and non-legume symbiotic nitrogen-fixing tree species are Leucaena or Alder. In the c step, the herb is miscanthus or clover. In the described a step, there are 4 strains of Halomonas ventosae bacteria, 1 strain of Halomonas campisalis bacteria, and 1 strain of Bacillus megaterium. In the step a, the added natural soil is air-dried and adjusted to a soil with a water content of 15-20% and a particle size of 0.5-1 cm. In step a, the water content of the microbial treatment layer 1 is 20-30%. In the step b, the natural soil is air-dried and adjusted to a soil with a water content of 15-20% and a particle size of 0.5-1 cm. The percentage of said water content is weight ratio. The COD mentioned in the present invention refers to the COD index in the waste sludge treatment in the field of drilling, that is, the chemical oxygen demand and the oil index.

Embodiment 3

[0033] The special microorganism that the present invention adopts belongs to Halomonas and Bacillus in classification, and 4 bacterial strains (C3-1, C7-2, C7-4 and C8-2) belong to Halomonas ventosae wherein; C5-2 belongs to Halomonas campisalis; C2-3 belongs to Bacillus megaterium. These strains have strong stress resistance (salt resistance 5%, pH 11.0 resistance), wide growth temperature range (15-37° C.), and good degradation effect on drilling waste mud components. These special bacteria are used to convert part of the complex substances in oil and gas exploration drilling waste mud into soil humus components, and partly degrade them into simple organic and inorganic compounds for use by other microorganisms in the soil and aboveground plants. Leucaena and alder planted are leguminous and non-legume symbiotic nitrogen-fixing tree species, transforming nitrogen in the atmosphere (N 2 ) to ammonia (NH 3 ) provides the nitrogen source required for plant growth, and also p...

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Abstract

The invention discloses a method for treating waste sludge in oil and natural gas exploration drilling operations, which relates to the technical field of pollution treatment of oil and natural gas exploration drilling. The method comprises the following steps: a. microbian treatment; b. soil treatment; c. and plant treatment. The method treats the waste sludge in a biological, soil and plant combined recondition mode, effectively reduces COD, Oil and other indices in the drilling operation waste by utilizing the actions of microbian strains and degrades most organic substances into simple inorganic substances, thereby removing pollutants from the sludge and achieving the goal of harmlessness.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration and drilling pollution control, in particular to a treatment method for waste sludge applied in oil and gas drilling operations. Background technique [0002] A large amount of waste sludge will be produced during oil and gas drilling. Generally, a well will produce 300-3000 cubic meters of waste sludge due to the different drilling depths (1000-7000 meters deep). The waste sludge contains a large amount of high-concentration drilling operation wastewater (generally, a well will produce 500-4000 cubic meters of wastewater due to the depth of the drilled well ranging from 1000-7000 meters). After treatment, the residual sludge is formed. Concentration enriches all the pollutants in the wastewater, and it also contains various drilling fluid treatment agents used in all drilling operations, generally up to 40-50 kinds of inorganic and organic chemical treatment additives. [0003] A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/02
Inventor 陈立荣陈强黄敏蒋学彬李辉张敏廖玲徐柄科
Owner BC P INC CHINA NAT PETROLEUM CORP
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