Method for recycling base oil of waste liquid of oil-based drilling liquid

An oil-based drilling fluid and recovery method technology, which is applied in the field of solid-liquid separation and the recovery of oil-based drilling fluid waste liquid base oil, can solve the problems of low base oil recovery rate, high equipment requirements, and high processing costs, and achieves no The effects of pollution and resource utilization, less equipment investment, and low treatment costs

Inactive Publication Date: 2013-09-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to overcome the defects of heating, complex process, high equipment requirements, high energy consumption, high processing cost and low recovery rate of base oil in the recovery process of oil-based drilling fluid waste liquid base oil. Method for recovering oil-based drilling fluid waste liquid base oil

Method used

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  • Method for recycling base oil of waste liquid of oil-based drilling liquid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Put the oil-based drilling fluid waste liquid from an oil field in a container with a stirring device, and in the stirring state, add water-in-oil cationic polyacrylamide emulsion with a mass percentage of 0.2% of the oil-based drilling fluid waste liquid, 0.65 % compound demulsifier P2, 1% sodium dioctyl sulfosuccinate and 0.4% ditetradecyl octadecyl dimethyl ethyl ammonium chloride. During the whole process, every time a drug is added, it must be fully stirred until it is evenly mixed. The resulting mixed solution was separated into solid and liquid with a centrifuge, and the results after separation are shown in Table 3.

[0029] Because the oil-based drilling fluid waste fluid in this example has high viscosity and poor fluidity, the required water-in-oil type cationic polyacrylamide emulsion must be dispersed in diesel oil first, and the water-in-oil type cationic polyacrylamide emulsion and diesel oil The mass ratio is 1:20; the required compound demulsifier P2 a...

Embodiment 2

[0031] Drilling fluid waste from an oil field was placed in a container with a stirring device, and in a stirring state, compound demulsifier P4 with a mass percentage of 0.4% oil-based drilling fluid waste liquid and 0.8% dipentyl sulfo Sodium succinate solution, 0.2% tetradecyl cetyl dimethyl ethyl ammonium dichloride and 0.1% water-in-oil anionic polyacrylamide emulsion. Every time a drug is added, it must be stirred thoroughly. Then the above-mentioned mixed solution was separated into solid and liquid with a centrifuge, and the results after separation are shown in Table 3.

[0032] In this example, the required composite demulsifier P4 and sodium dipentyl sulfosuccinate must be diluted with methanol to form a solution with a concentration of 20% by mass, and then added to the oil-based drilling well according to the above steps. in liquid waste.

Embodiment 3

[0034] The oil-based drilling fluid waste liquid of an oil field is placed in a container with a stirring device, and in a stirring state, water-in-oil type zwitterionic polyacrylamide emulsion with a mass percentage of 0.4% of the oil-based drilling fluid waste liquid, 0.8% compound demulsifier P4, 1% sodium dioctyl sulfosuccinate and 0.3% ditetradecyl octadecyl dimethyl ethyl ammonium dichloride. During the process, every time a drug is added, it must be fully stirred. The above mixed solution was subjected to solid-liquid separation, and the results after separation are shown in Table 3.

[0035] Before treatment, the required compound demulsifier P4 and diisooctyl sodium sulfosuccinate should be diluted with ethanol respectively to a solution with a concentration of 15% by mass, and then added to the waste oil-based drilling fluid in sequence according to the above steps. in the liquid.

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Abstract

The invention relates to a method for recycling base oil of the waste liquid of an oil-based drilling liquid, and in particular belongs to a solid-liquid separation technique in the technical field of waste oil-based drilling liquid treatment. The method comprises the following steps of: (1) preparing a composite demulsifying agent, namely compounding AE, BP, AP and OP-10 or NP-10, wherein the mass ratio of the AE to the BP to the AP to the OP-10 or the NP-10 is 1 to 2 to 2 to 1, 2 to 1to 1 to 2, 1to 3to 3 to 2 or 2 to 3 to 2 to 1; (2) demulsifying and flocculating, namely under a stirring state, adding a polymeric flocculant, the composite demulsifying agent, an anionic surfactant and a cationic surfactant into the waste liquid of the oil-based drilling liquid; and (3) carrying out solid-liquid separation. The method provided by the invention is suitable for recycling and treatment of the base oil of the waste liquid of various oil-based drilling liquids, the technology is simple, no heating is needed, the investment is less, the cost is low, and the recycling rate of the oil is high; the recycled base oil is used for preparing the drilling liquid again, the performance of the drilling liquid is not changed, so that harmlessness and reclamation of the drilling liquid are realized, and energy is saved.

Description

Technical field: [0001] The invention relates to a method for recovering oil-based drilling fluid waste liquid base oil, which belongs to the technical field of oil and gas field wastewater (liquid) and waste residue treatment, and specifically belongs to the solid-liquid separation technology in the technical field of waste oil-based drilling fluid treatment. technical background: [0002] Shale gas resources in major basins and regions in my country are about 1.5×10 5 Billion cubic meters~3.0×10 5 billion cubic meters, and the development of shale gas reservoirs has been included in my country's "Twelfth Five-Year Plan" energy development plan. By 2015, the domestic newly-added proven reserves are expected to reach 6.0×10 3 billion cubic meters, and by 2020, 50-80 favorable target areas and 20-30 exploration and development areas should be selected. Oil-based drilling fluid is used in the exploration and development of unconventional oil and gas reservoirs such as shale ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/32C02F1/40C02F1/56C02F103/10
Inventor 马雅雅王中华何焕杰詹适新袁华玉张鑫
Owner CHINA PETROLEUM & CHEM CORP
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