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A method for preparing roadbed filler for well-passing roads from oily sludge in oilfields

A technology for roadbed filler and oil sludge, applied in sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of complex composition, safety and health hazards, etc., to improve processing capacity, reduce processing costs, improve The effect of resource utilization level

Active Publication Date: 2017-01-18
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Domestic research on improving oily sludge for laying well roads is in the exploratory stage, and there are mainly the following technical problems: (1) Due to the complex composition and special properties of oily sludge, what kind of improvement process can be adopted to make it meet the needs of oilfields? The relevant technical properties of the well-passing road filler are in compliance with the relevant provisions of the "Technical Specifications for Highway Subgrade Construction" (JTGF10-2006); (2) While meeting the above engineering technical parameters, in order to ensure that oily sludge The process will not cause environmental pollution, and the comprehensive utilization of oily sludge roadbed filler will not cause secondary pollution, and will not bring harm to the safety and health of operators and users. It is necessary to strictly control the toxic and harmful substances in oily sludge. There are environmental protection requirements

Method used

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  • A method for preparing roadbed filler for well-passing roads from oily sludge in oilfields
  • A method for preparing roadbed filler for well-passing roads from oily sludge in oilfields

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Example 1: Typical Oilfield Oily Sludge - Polymer Sludge

[0031] (1) Take an appropriate amount of oil sludge containing polymers in an oil field, and remove weeds, tree roots, plastics and other components;

[0032] (2) Wash the oily sludge with tap water at 60°C or use chemicals at room temperature to recover the dirty oil;

[0033] (3) Solid-liquid separation of oily sludge is carried out by centrifugation, the moisture content of the remaining solids is 53%, and the petroleum hydrocarbons are reduced to ≤2%;

[0034] (4) Weigh 500g of residual sludge after treatment, add 50g of curing agent, 45g of drying agent, 20g of fine aggregate and 1.5g of improvement additive, and stir well;

[0035] (5) at Vibrate evenly in a stainless steel mold, cover with film, and carry out standard curing in the curing box;

[0036] (6) The sample was tested after 7 days, and its CBR value was 9.34%, the unconfined compressive strength was 2.69, and the plasticity index was 18.3%. ...

Embodiment 2

[0039] Example 2: Typical oilfield oily sludge—thin oily sludge

[0040] (1) Take an appropriate amount of thin oil sludge from an oilfield to remove weeds, tree roots, plastics and other components;

[0041] (2) Heat and wash the oily sludge with tap water at 60°C or use chemical agents at room temperature to recover the dirty oil;

[0042] (3) Solid-liquid separation of oily sludge is carried out by centrifugation, the moisture content of the remaining solids is 65.4%, and the petroleum hydrocarbons are reduced to ≤2%;

[0043] (4) Weigh 500g of residual sludge after treatment, add 46g of curing agent, 56g of drying agent, 20g of fine aggregate and 1g of improvement additive, and stir well;

[0044] (5) at Stir and oscillate evenly in a stainless steel mold, cover it with a film, and perform standard maintenance in a curing box;

[0045] (6) The test sample was obtained after 7 days, with a CBR value of 7.26%, an unconfined compressive strength of 2.13, and a plasticity ...

Embodiment 3

[0048] Example 3: Typical Oilfield Oily Sludge - Heavy Oil Sludge

[0049] (1) Take an appropriate amount of heavy oil sludge from Liaohe Oilfield, and remove weeds, tree roots, plastics and other components;

[0050] (2) Use the anaerobic pyrolysis device to pyrolyze the oily sludge at 600°C to recover waste oil and non-condensable gas;

[0051] (3) The moisture content of the remaining solids is less than 0.1%, petroleum hydrocarbons are reduced to ≤0.3%, its CBR value is 8.04%, the unconfined compressive strength is 2.01, and the plasticity index is 10.45%, which meets the requirements of fillers;

[0052] (4) Put the above sample at 0.5t / m 3 The proportion is mixed with the local road construction soil. After treatment, the CBR value is 43.8%, the plasticity index is 10.51, and the degree of compaction is 93%. The maximum dry density is 2.00g / m 3 . The main pollutants in the subgrade samples can meet the requirements of "Soil Environmental Quality Standard 2008" (draft ...

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Abstract

The invention relates to a method for preparation of a drifting road subgrade filler from oil field oily sludge. The method includes: conducting heat treatment on oily sludge by anaerobic heating; conducting solid-liquid separation, and recovering polluted oil and sewage to conduct treatment; adding a curing agent, a drying agent, fine aggregate and an improved additive into the remaining solid, and placing the mixture into a curing box to conduct curing; measuring the CBR values of the molded sample respectively on 3d, 7d and 28d, unconfined compressive strength, and plasticity index parameters; selecting a qualified oil sludge sample, fully mixing the sample with local soil according to an adding ratio of 0.5t / m<3>, performing rolling according to a compaction degree of 94%, after meeting the requirements, conducting soaking in water for 24h, and measuring the total petroleum hydrocarbon amount and the content of polycyclic aromatic hydrocarbon and heavy metals in the leachate according to national standards; and respectively comparing the engineering technological indexes and leachate pollutant indexes of the oily sludge improved filler with relevant national standard specifications, and judging the product performance. The method provided by the invention improves the resource utilization level of oily sludge and reduces the treatment cost.

Description

technical field [0001] The invention relates to a method for preparing roadbed filler for well-passing roads from oily sludge in oilfields. Background technique [0002] At present, domestic oil fields produce about 1 million tons of oily sludge every year. Oily sludge is included in the HW08 waste mineral oil category in the "National Hazardous Waste List" (2008). It belongs to the natural crude oil and natural gas exploitation industry, and its main hazardous characteristics are T (toxicity) and I (flammability). If the oil and some minerals in the oily sludge can be effectively recovered, it can not only realize the recycling of waste, but also reduce the harm of pollutants to the environment. "Technical Specifications for Pollution Control of Waste Mineral Oil Recycling" (HJ607-2011) stipulates that oily sludge and oily sludge sand with an oil content greater than 5% should be recycled, and the oil content of oily sludge sand should be less than 2% after oil sand separa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/10C04B18/04
CPCY02W30/91
Inventor 岳勇王蓉沙邓皓刘鹏任雯谢水祥张明栋孙静文刘晓辉程泽生万明策
Owner PETROCHINA CO LTD
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