Method for extracting nonpolar substances from oil-based drilling cuttings and extraction device

An extraction device and oil-based drilling cuttings technology, applied in the field of methods and extraction devices, can solve the problems of high recovery rate of base oil, low operating cost, and low efficiency of oil-based drilling cuttings, so as to avoid blockage of pipelines and pressure field evenly distributed effect

Active Publication Date: 2018-04-17
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...

Method used

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  • Method for extracting nonpolar substances from oil-based drilling cuttings and extraction device
  • Method for extracting nonpolar substances from oil-based drilling cuttings and extraction device
  • Method for extracting nonpolar substances from oil-based drilling cuttings and extraction device

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 is expanded and separate...

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 technical field of petroleum, in particular to a method for extracting nonpolar substances from oil-based drilling cuttings and an extraction device. The device comprisesa liquid storage tank, a high-pressure pump, an intermediate storage tank, an extraction kettle and a separation kettle which are communicated in sequence, wherein a compression pump is also arrangedbetween the separation kettle and the liquid storage tank, and a discharge port of the separation kettle and a feed port of the liquid storage tank are communicated through the compression pump. The method comprises the following steps: the oil-based drill cuttings are put into the extraction kettle, supercritical CO2 is enabled to flow through the extraction kettle in a countercurrent flow mode,so that the oil-based drill cuttings in the extraction kettle make contact with a supercritical CO2 fluid, and nonpolar substances in the supercritical CO2 fluid are extracted and separated in the separation kettle. The device is simple in structure, convenient to use, low in energy consumption and high in efficiency. The method has the advantages that resource, reduction and harmless treatment ofthe oil-based drilling cuttings is realized, treatment effect is good, recovery rate of base oil is high, and operation cost is low, and the problems of low efficiency and poor effect of treatment ofthe oil-based drilling cuttings by supercritical CO2 at present are solved.

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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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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