A method and extraction device for extracting non-polar substances from oil-based drilling cuttings

An extraction device and technology for oil-based drilling cuttings, which are applied in separation methods, solvent extraction, solid solvent extraction, etc., can solve the problems of high base oil recovery rate, low operating cost, and low efficiency in treating oil-based drilling cuttings, etc. The effect of blocking pipelines and uniform pressure field distribution

Active Publication Date: 2021-05-04
中石化石油工程技术服务有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The object of the present invention is also to provide a method for extracting non-polar substances from oil-based drilling cuttings, which can well realize the recycling, reduction and harmless treatment of oil-based drilling cuttings, and has a good treatment effect , High recovery rate of base oil, low operating cost, solves the current problem of supercritical CO 2 Dealing with oil-based cuttings is inefficient and ineffective

Method used

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  • A method and extraction device for extracting non-polar substances from oil-based drilling cuttings
  • A method and extraction device for extracting non-polar substances from oil-based drilling cuttings
  • A method and extraction device for extracting non-polar substances from oil-based drilling cuttings

Examples

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Effect test

Embodiment 1

[0032] An extraction device, including a liquid storage tank 1, a water cooling device 8, a high-pressure pump 2, an intermediate storage tank 3, an extraction kettle 4, and a separation kettle 6 connected in sequence, and a compressor is also arranged between the separation kettle and the liquid storage tank. Pump 7, the discharge port of the separation tank is connected with the feed port of the liquid storage tank through a compression pump.

[0033] It also includes a heater 5, an insulation layer is provided on the outside of the intermediate storage tank, an insulation layer is provided on the outside of the extraction kettle, and the heater is connected to the insulation layer.

[0034] The extraction kettle is a cylinder, and the two ends of the cylinder have end covers, which are the upper cover and the lower cover respectively, and sealing rings are arranged between the upper cover, the lower cover and the cylinder body, and the upper and lower covers are realized by ...

Embodiment 2

[0037] A method for extracting non-polar substances from oil-based drilling cuttings using the extraction device described in Example 1, the specific steps are as follows:

[0038] (1) Take 160Kg of oil-based drilling cuttings (oil content 18%, density 2.0g / cm2) from Well Coke Page 27-1HF 3 ), put into the 100L extractor;

[0039] (2) Raise the temperature of the extraction kettle to 35°C, separate the kettle, and raise the inlet temperature to the separation temperature of 60°C, and turn on the high-pressure pump for continuous operation to make the liquid CO 2 into supercritical CO 2 Fluid, and stabilized for 5-10min, so that the pressure during the extraction process is 10MPa;

[0040] (3) Open the inlet valve on the lower part of the extraction kettle and the outlet valve on the upper part, and open the separation kettle at the same time, supercritical CO 2 And the extracted non-polar substances flow out of the extraction kettle, CO 2 The fluid expands and separates in...

Embodiment 3

[0044] A method for extracting non-polar substances from oil-based cuttings using the extraction device described in Example 1, wherein the extraction temperature is 35°C, the pressure is 12MPa, the temperature of the separation process is 60°C, and the rest are the same as in Example 1.

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PUM

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Abstract

The invention relates to the field of petroleum technology, in particular to a method and an extraction device for extracting non-polar substances from oil-based drilling cuttings. The device includes a liquid storage tank, a high-pressure pump, an intermediate storage tank, an extraction kettle, and a separation kettle connected in sequence. A compression pump is also arranged between the separation kettle and the liquid storage tank. The outlet of the separation kettle and the liquid storage The feed port of the tank is communicated by a compression pump. The method is to put oil-based drilling cuttings into the extraction kettle to make supercritical CO 2 It flows through the extraction tank in a countercurrent flow mode, so that the oil-based cuttings in the extraction tank and supercritical CO 2 The fluids are contacted, the non-polar substances are extracted, and then separated in the separation tank. The device of the invention has the advantages of simple structure, convenient use, low energy consumption and high efficiency. The method of the present invention realizes the recycling, reduction and harmless treatment of oil-based drilling cuttings, and has good treatment effect, high recovery rate of base oil, and low operating cost, and solves the problem of supercritical CO2 at the present stage. 2 Dealing with oil-based cuttings is inefficient and ineffective.

Description

technical field [0001] The invention relates to the field of petroleum technology, in particular to a method and an extraction device for extracting non-polar substances from oil-based drilling cuttings. Background technique [0002] With the increasing development of unconventional energy such as shale gas and tight gas around the world, oil-based drilling fluid technology has become more and more widely used, and has become one of the key technologies for shale gas horizontal well drilling. However, the resulting disposal of oil-based cuttings has not been resolved in a timely manner. [0003] In foreign countries, oil-based drilling cuttings recycling, reduction and harmless treatment technology has become the development trend of oil-based drilling cuttings treatment technology. Traditional treatment technologies such as incineration and landfill storage have been gradually eliminated due to the lack of recovery of mineral oil, resulting in a large waste of resources an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D11/02C10G1/04
CPCB01D11/0203C10G1/04
Inventor 位华何焕杰王中华张弌马金神正怀
Owner 中石化石油工程技术服务有限公司
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