A kind of oil-washing method of oil-based mud-contaminated cuttings
A technology for oil-based mud and cuttings, which is applied in the field of sample pretreatment for geochemical analysis, and achieves the effect of high operability and good oil washing effect.
Active Publication Date: 2019-12-31
CHINA UNIV OF GEOSCIENCES (BEIJING)
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Problems solved by technology
These cleaning technologies are all from the perspective of environmental protection. The surface of the cleaned cuttings still has more or less base oil in the oil-based mud—diesel and sulfonated asphalt components, which cannot be used for geochemical analysis and testing. scientific research in series of experiments
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Embodiment 1
[0042] a. Selection of samples
[0043] The cuttings polluted by oil-based mud on the drilling site are generally viscous. The oil-based mud-contaminated cuttings selected in this example are the cuttings returned to the core storehouse after being dried on site, such as Figure 3-1 , 3-2 , The oil-based mud on the surface of this type of cuttings is mainly composed of diesel oil, sulfonated asphalt and a small amount of organic soil, so it is black solid, the particle size of the debris is about 0.5mm-100mm, and it has a strong oily smell.
[0044] b.Experimental principle
[0045] Through many experiments, it is determined to select the equivolume ratio mixed solution of absolute ethanol with strong polarity and benzene with weak polarity and strong ability to dissolve non-hydrocarbons. Due to the coarse particle size and low permeability of the mudstone cuttings samples, the mixed solution can dissolve the oil-based mud pollutants on the cuttings surface but not penetrate...
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Abstract
The invention aims at providing a technology capable of carrying out oil washing treatment on oil-based mud-contaminated mudstone debris, so that organic pollutants, such as diesel oil, attached on the surface of the rock debris are accurately removed, the content of an organic matter of the cleaned mudstone debris is not affected, and the technology can be applied to scientific research in series experiments of geochemical analysis tests. The invention further provides a method for evaluating the cleaning effect of the oil-based mud-contaminated rock debris by using a spectrogram and parameters of rock pyrolysis analysis. Through the method, the extracting and oil washing accuracy of volume mixtures, such as ethanol and benzene, is effectively verified, the contaminated rock debris can be reapplied to the geochemical analysis tests, and meanwhile, the application range of a rock pyrolysis instrument is also expanded.
Description
technical field [0001] The invention belongs to the field of pretreatment of geochemical analysis samples, and in particular relates to an oil washing method for oil-based mud polluted cuttings. Background technique [0002] The main organic components of oil-based mud are diesel oil, sulfonated asphalt, organic soil powder, emulsifier, etc., which have the advantages of high temperature resistance, salt and calcium erosion resistance, good wellbore stability, good lubricity, and little damage to oil and gas layers. It is more and more widely used in the drilling of collapsible wells, highly deviated wells and deep wells. [0003] At present, there is no current standard for the oil washing method of oil-based mud contaminated cuttings. Most of the cuttings samples are roughly cleaned from the perspective of environmental protection. The samples after oil washing are far from meeting the requirements of scientific research, testing and analysis. The current cleaning technol...
Claims
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IPC IPC(8): G01N1/40G01N1/34G01N1/38B01D3/40
CPCB01D3/40G01N1/34G01N1/38G01N1/4055G01N2001/386G01N2001/4061
Inventor 侯读杰丁文静吴飘畅哲李斌贾智彬许婷程熊张自鸣张小涛张维维洪梅赵喆姜玉涵陈秀董立成杨丽杰赵子斌毛榕张俞何大双代峰熊杰殷岳升
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)