Water plugging agent prepared by utilizing oil residues or oil-containing sludge and preparation method thereof

A technology for water blocking agent and oil sludge, which is applied in chemical instruments and methods, earthwork drilling, drilling composition, etc., can solve the problems of expensive extraction agent, secondary pollution, low energy consumption of microbial treatment method, etc. , to achieve the effect of expanding the swept volume of injected water, good rheology and thixotropy, and reducing cost and difficulty

Active Publication Date: 2016-02-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hot water washing process is easy to implement, low in investment costs, and can recover most of the oil products. It is difficult to deal with heavily emulsified oily sludge, which may cause secondary pollution. It is mainly suitable for landing oil sludge; the incineration method can reduce the amount to the greatest extent. Strong adaptability to raw materials, but high energy consumption, large equipment investment, high process technology requirements, generally low heat utilization rate, and there may be dust, SO 2 It is suitable for oily sludge with low water content and high oil content; the medium of thermal desorption method is completely inorganic, and hydrocarbons can be recycled, but the reaction conditions are relatively high and the operation is relatively complicated. Sludge with low water content and high hydrocarbon content; solvent extraction method has high efficiency and thorough treatment, and most petroleum substances can be extracted and recovered, but the extraction agent is expensive, there is some loss during the extraction process, and the treatment cost is high. It is suitable for tanks Bottom sludge: The microbial treatment method has low energy consumption and low treatment cost, but the treatment period is long, and the treatment effect on cycloalkanes, aromatics and heterocyclics is poor. It is difficult to adapt to high oily sludge, and resources cannot be reused. It is suitable for oil content Less than 5% oily sludge
Due to the complex composition of oily sludge, no single treatment method can deal with all types of oily sludge

Method used

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  • Water plugging agent prepared by utilizing oil residues or oil-containing sludge and preparation method thereof
  • Water plugging agent prepared by utilizing oil residues or oil-containing sludge and preparation method thereof
  • Water plugging agent prepared by utilizing oil residues or oil-containing sludge and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This embodiment provides a water shutoff agent prepared by using oil residue or oily sludge. In terms of weight percent, the raw materials for the preparation of the water blocking agent include:

[0033] Oil residue: 30% (among them: the sand ratio is 10%, the oil ratio is 20%, and the balance is water);

[0034] Sodium bentonite: 5%;

[0035] Superfine cement: 5%;

[0036] Ultrafine silica: 0.5%;

[0037] Sodium borate: 0.5%;

[0038] The balance is water.

[0039] In this embodiment, the particle size of the sediment particles in the oil residue is 0.01-2 mm, the average particle size of the ultrafine silica is 0.5-5 μm, and the average particle size of the ultrafine cement is less than or equal to 5 μm.

[0040] In this example, the water blocking agent prepared by using oil residue or oily sludge is prepared by the following method:

[0041] Sodium-based bentonite was swelled with oilfield sewage at 50°C for half an hour, and stirred at a stirring speed of 30...

Embodiment 2

[0052] This embodiment provides a water shutoff agent prepared by using oil residue or oily sludge. In terms of weight percent, the raw materials for the preparation of the water blocking agent include:

[0053] Oily sludge: 60% (among them: the sand ratio is 40%, the oil ratio is 50%, and the balance is water);

[0054] Sodium bentonite: 15%;

[0055] Superfine cement: 10%;

[0056] Ultrafine silica: 5%;

[0057] Sodium phosphate: 5%;

[0058] The balance is water.

[0059] In this embodiment, the particle size of the sediment particles in the oily sludge is 0.01-2 mm, the average particle size of the ultrafine silica is 0.5-5 μm, and the average particle size of the ultrafine cement is less than or equal to 5 μm.

[0060] In this example, the water blocking agent prepared by using oil residue or oily sludge is prepared by the following method:

[0061] Sodium-based bentonite was swelled with oilfield sewage at 55°C for half an hour, and stirred at a stirring speed of 1...

Embodiment 3

[0068] This embodiment provides a water shutoff agent prepared by using oil residue or oily sludge. In terms of weight percent, the raw materials for the preparation of the water blocking agent include:

[0069] Oil residue: 40% (among them: the sand ratio is 30%, the oil ratio is 20%, and the balance is water);

[0070] Sodium bentonite: 12%;

[0071] Superfine cement: 8%;

[0072] Ultrafine silica: 3%;

[0073] Sodium metaphosphate: 2%;

[0074] The balance is water.

[0075] In this embodiment, the particle size of the sediment particles in the oil residue is 0.01-2 mm, the average particle size of the ultrafine silica is 0.5-5 μm, and the average particle size of the ultrafine cement is less than or equal to 5 μm.

[0076] In this example, the water blocking agent prepared by using oil residue or oily sludge is prepared by the following method:

[0077] Sodium-based bentonite was swelled with oilfield sewage at 55°C for half an hour, and stirred at a stirring speed o...

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Abstract

The invention provides a water plugging agent prepared by utilizing oil residues or oil-containing sludge and a preparation method thereof. The water plugging agent comprises the following preparation raw materials in percentage by weight: 30 percent to 60 percent of oil residues or oil-containing sludge, 5 percent to 15 percent of bentonite, 5 percent to 10 percent of cement, 0.5 percent to 5 percent of thixotropic agent, 0.5 percent to 5 percent of inorganic retarder and the balance of water. The invention also provides the preparation method of the water plugging agent prepared by utilizing the oil residues or the oil-containing sludge. The water plugging agent prepared by utilizing the oil residues or the oil-containing sludge, which is provided by the invention, has high compressive strength, good high-temperature resistance and good rheological property and thixotropy; plugging on a leaked channel can be implemented by adopting a small quantity of water plugging agent; the water plugging agent has good plugging selectivity in a severe heterogeneous oil reservoir and has excellent plugging performance for a high permeability channel. The oil residues and the oil-containing sludge which are products discharged by an oil extraction plant are comprehensively utilized, which not only reduces cost and difficulty in processing the oil residues and the oil-containing sludge, but also reduces pollution of the oil residues and the oil-containing sludge to the environment.

Description

technical field [0001] The invention relates to a water shutoff agent prepared from oil residue or oily sludge and a preparation method thereof, belonging to the field of oil well water shutoff. Background technique [0002] Oil residue is the product of advanced treatment of oily sludge. Oily sludge refers to oil tanks, settling tanks, sewage tanks, bottom sludge of grease traps, oily water treatment facilities in refineries, light hydrocarbon processing plants, The oil sand and oil sludge removed by the natural gas purification device, the ground crude oil and oily sludge produced by drilling, operation, and pipeline perforation. When the oil storage tank is storing oil, a small amount of mechanical impurities, sand, soil, heavy metal salts, and heavy oily components such as paraffin and asphaltene in the oil deposit on the bottom of the oil tank to form sludge at the bottom of the tank. [0003] The oily sludge is huge in volume. If it is discharged directly without trea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/506C09K8/508E21B33/138
CPCC09K8/506C09K8/5083C09K8/5086E21B33/138
Inventor 陈小凯刘德铸张洪君郑猛李瑞朱伟刘强柳荣伟李俊萍阳小英王珣贺梦琦吴赞美张芸孙士馨
Owner PETROCHINA CO LTD
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