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A method for treating oil-based drilling cuttings

A technology of oil-based cuttings and processing methods, which is applied in the direction of chemical instruments and methods, earthwork drilling, drilling compositions, etc., can solve the problems of not being well separated, many safety hazards, and large equipment investment, etc., to achieve Achieve resource utilization and harmlessness, improve the ability to remove oil pollution, and reduce equipment investment

Inactive Publication Date: 2019-02-22
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN102888215A discloses an oil-based drilling fluid oil-containing drill cuttings degreaser, the main components of which are anionic surfactants and nonionic surfactants. Because there is no demulsifier, the oil-based drilling fluid adhered to the surface of drilling cuttings remains stable. Therefore, when the centrifuge tube with cracks is used for separation, the three phases of oil, water and solid are not well separated, only the oil-based drilling fluid on the surface of the cuttings is removed, and the removed oil-based drilling fluid needs to be processed again
The disclosed method of CN1650140A uses a large amount of strong acid such as concentrated sulfuric acid, so there are many problems, such as high equipment requirements; many potential safety hazards in the operation and transportation process; concentrated sulfuric acid belongs to the control of dangerous chemicals, and it is difficult to purchase
In addition, the process is complicated and the equipment investment is large, which is not suitable for oil-based drilling cuttings treatment in my country.

Method used

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  • A method for treating oil-based drilling cuttings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Put the oil-based cuttings in an oilfield in a container with stirring facilities, add 0.4% of the mass of the oil-based cuttings W-035 under continuous stirring at 200rpm, and stir for 3 minutes; add 10% of the mass of the oil-based cuttings and Mass fraction is 10% methanol solution of ethylene glycol stearate and 20% and mass fraction is 10% secondary alkyl sodium sulfate aqueous solution, stir 5min, obtain a mixture; The above-mentioned mixture is 2500rpm at rotating speed, separation time Separation under the condition of 5min.

Embodiment 2

[0028] Put the oil-based cuttings of an oilfield in a container with a stirring facility, add 0.6% of the mass of the oil-based cuttings W-013 under continuous stirring at 300rpm, and stir for 2 minutes; add 10% of the mass of the oil-based cuttings and Mass fraction is 10% ethanol solution of sorbitan monooleate and 20% and mass fraction is 10% sodium dodecylsulfonate aqueous solution, stirs 10min, obtains a mixture; Be 3000rpm at rotating speed, separation time is Under the condition of 5 min, the above mixture was separated.

Embodiment 3

[0030] Put the oil-based cuttings of an oilfield in a container with a stirring facility, add 1.0% of the mass of the oil-based cuttings W-035 under constant stirring at 300rpm, and stir for 3 minutes; add 20% of the mass of the oil-based cuttings and Mass fraction is 10% ethyl acetate solution of glyceryl monostearate and 20% and mass fraction is 20% sodium lauryl sulfate aqueous solution, continue to stir for 5min, obtain a mixture; The above mixture was separated under the condition that the separation time was 5 min.

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Abstract

The invention relates to an oil base drill chip processing method, belongs to the field of environment protection, and particularly belongs to the technical field of drilling waste processing in oil and natural gas industry. The method comprises the following steps of: (1) demulsification: adding demulsifying agents accounting for 0.4 percent to 1.0 percent of the mass of oil base drill chips into the oil base drill chips in a stirring state; (2) cleaning: adding a non-ionic surfactant solution accounting for 10 percent to 30 percent of the mass of the oil base drill chips and an anionic surfactant solution accounting for 20 percent to 30 percent of the mass of the oil base drill chips into the demulsified oil base drill chips in the first step in the stirring state to obtain an oil-water-solid mixture; (3) separation: carrying out centrifugal separation on the mixture in the step (2); and (4) processing by hydrocarbon degradation bacteria: regulating the pH of the separated oil base drill chips and then adding nutrients, nutrient providers, bulking agents and the hydrocarbon degradation bacteria. The method has the advantages that the oil recovery rate is higher than 94 percent; the oil content of the drill chips is less than 0.3 percent; the operation is simple; the equipment investment is low; and reclamation and harmlessness are realized.

Description

technical field [0001] The invention relates to a method for treating oil-based drilling cuttings, which belongs to the field of environmental protection, in particular to the technical field of drilling waste treatment in the oil and natural gas industry. technical background [0002] Oil-based drilling fluid is a stable colloidal system composed of oil as the continuous phase and water as the dispersed phase, and contains an appropriate amount of emulsifier, wetting agent, lipophilic colloid and weighting agent. It is safe, strong in inhibition and good in lubricity Therefore, it is widely used in the drilling of shale (oil) gas wells, special complex wells and other horizontal sections. During the drilling process, a large amount of oily cuttings are produced, that is, oil-based cuttings contain a large amount of mineral oil and the above additives, which belong to hazardous solid waste. If it is not handled properly, it will cause serious damage to the surrounding envir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B21/06C09K8/524
CPCC09K8/524E21B21/065
Inventor 马雅雅何焕杰王中华詹适新吕宁超位华
Owner CHINA PETROCHEMICAL CORP
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