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Method and system for capturing and masking heavy metal in well drilling wastes

A technology of drilling waste and heavy metal scavenger, which is applied in chemical instruments and methods, water pollutants, dehydration/drying/thickened sludge treatment, etc., and can solve the problems of high solidification treatment costs, complicated treatment effects, and large floor space. question

Active Publication Date: 2013-03-27
北京华盛坤泰环境科技股份有限公司
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of solidification treatment is high, and a mud pool needs to be built for each well, which covers a large area (after solidification treatment is generally used, the volume of solidification can be in

Method used

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  • Method and system for capturing and masking heavy metal in well drilling wastes
  • Method and system for capturing and masking heavy metal in well drilling wastes
  • Method and system for capturing and masking heavy metal in well drilling wastes

Examples

Experimental program
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Effect test

Embodiment Construction

[0039] A new well of PetroChina Tarim Oilfield is located in Shaya County, Aksu Region, Xinjiang. Three-level structure well with a design depth of 6845m.

[0040] Drilling well structure and drilling mud system

[0041]

[0042]

[0043] From the analysis data of adjacent wells on the same plot using the same mud system, the mercury, cadmium, lead, zinc, copper, arsenic, total chromium, and nickel in the original mud fluid during the first, second, and third drilling intervals exceeded the standards, especially In the later period of the second opening and the third opening period, it exceeded the standard seriously. The reason why heavy metals exceed the standard is due to the mud formula and also related to the stratum structure.

[0044] The example is carried out according to the above steps 1~5.

[0045] In the above step 1, the waste mud is diluted in the sand and gravel separator at a ratio of 1:1 to 1.5, and the separated rock debris is backwashed and removed. Pump the thi...

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Abstract

The invention provides method and system for capturing and shielding heavy metal in well drilling wastes. The system comprises a sandstone separator, a mud storage agitation tank, a mud reaction tank, a dewatering device and a depositing tank, and the method comprises the steps of: adding a pH regulator, an oxidant and a heavy metal capturing agent into heavy metal elements in well drilling wastes in turn through technical means so as to be combined into an organic sulfur heavy metal chelate compound, and conducting composite flocculation to realize stability breaking and solid-liquid separation; after being mechanically dewatered, separated solids can be used for repairing road and filling fields or returning to fields in a form of mud cakes. According to the method and system, the heavy metal elements in well drilling wastes are converted into heavy metal organic sulfide with high chemical stability, and soil and underground water are prevented from being polluted by heavy metals, thereby playing a shielding role.

Description

Technical field [0001] The invention relates to the treatment of hazardous waste discharged during oil and gas field drilling, in particular to a technology of capturing and masking heavy metals in drilling waste. Background technique [0002] Drilling waste is one of the main pollution sources in the oil and gas industry, and its waste disposal is currently a major problem that plagues oil fields. In 2008, "Sludge from Waste Drilling Fluid Treatment" (waste code 071-002-08) was listed in the National Hazardous Waste List in the "National Directory of Hazardous Wastes". Among them, heavy metals are the main pollutants in the waste drilling mud. one. [0003] According to the statistical analysis of the drilling mud composition data of various domestic oilfields, heavy metals are widely distributed in abandoned drilling muds. Except for silver, almost all common hazardous metals have been detected, such as Zn, Pb, Cu, Ni, Hg, As , Cr, etc. The waste drilling mud contains high met...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/14C02F101/20
Inventor 司军吕允谦
Owner 北京华盛坤泰环境科技股份有限公司