Method for on-line spectral determining oily gas in drilling liquid
A technique for spectroscopic measurement and drilling fluid, which is applied in the field of online spectrometry of species and concentration, can solve problems affecting sample quality, long analysis period, unfavorable objective and accurate judgment of oil and gas layers, etc., to improve data accuracy and shorten analysis period Effect
Inactive Publication Date: 2009-02-11
SHANGHAI GASOLINEEUM & CHEM EQUIP
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Problems solved by technology
The experience and working attitude of the staff directly affect the quality of the samples taken, thus affecting the judgment results of oil and gas layers
Therefore, this method is too artificial, which is not conducive to objective and accurate judgment of oil and gas layers.
[0007] 2. The above methods all need to pretreat the sample, separate the measurable components, and then transmit them to the analyzer for detection, which leads to long analysis period, low measurement efficiency and poor measurement accuracy
[0008] 3. With the improvement of drilling technology and process, the drilling speed is getting faster and faster, and the particle size of the returned cuttings is getting smaller and smaller, most of which are less than 1mm in diameter, which makes it difficult to retrieve cuttings samples, especially for reservoir rocks. Crumbs, almost impossible to pick out
If air or air foam drilling is used, not only is it difficult to retrieve cuttings, but also the separation of gas components is difficult in online chromatography. Therefore, the above mud logging methods have the difficulty of obtaining analytical samples.
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[0028] See figure 1 , figure 1 It is a flow chart including the mud logging method of the present invention. As shown in the figure, the mud logging method comprising the present invention is:
[0029] 1. Determining the type and concentration of volatile hydrocarbons in the drilling fluid, the steps include:
[0030] (1) Determination of volatile hydrocarbon standard sample 11 by infrared spectrometer. Referring now to Fig. 2, Fig. 2 is a device for measuring the type and concentration of gas contained in the drilling fluid. Below we detail the concrete realization process of step (1) with reference to Fig. 2: the optical fiber probe 24 that connects light source 21 and infrared spectrometer 23 is approached standard sample 11 (standard sample 11 is the volatile hydrocarbon of known kind and concentration), light source 21 The surface of the standard sample 26 is irradiated by the optical fiber probe 24, and the infrared spectrometer 23 records the reflected light signal ...
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Abstract
A method of using on-line spectrum to analyze oil-gas contained in drilling liquid includes approaching probe connected with light source and spectrograph to be near to standard sample to obtain spectrum of each composition and concentration-light intensity curve of each composition in standard sample, approaching said probe to be near to drilling liquid to obtain spectrum and light intensity of drilling liquid and using said spectrum and light intensity to confirm content and concentration of each composition in drilling liquid.
Description
technical field [0001] The invention relates to a method for measuring the type and concentration of oil and gas in drilling fluid, in particular to an online spectroscopic method for measuring the type and concentration of oil and gas in drilling fluid. Background technique [0002] At present, the mud logging method in the oil drilling process includes measuring the type and concentration of gas (ie, volatile hydrocarbons) in the drilling fluid, measuring the type and concentration of oil in the drilling fluid, drawing a mud logging diagram according to the oil and gas content, and judging from the mud logging diagram. Hydrocarbon layer. [0003] A mud logging method in the prior art is chromatography, which measures the gas concentration in the drilling fluid by chromatography, and then calculates the oil concentration based on the measured gas concentration. During the implementation of this method, the volatile components contained in the drilling fluid need to be sepa...
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IPC IPC(8): G01N21/27G01N21/64
Inventor 袁建新李荣
Owner SHANGHAI GASOLINEEUM & CHEM EQUIP