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While-drilling multi-parameter analysis-based oil-gas-water identification method and system

An identification method, oil, gas and water technology, applied in earthwork drilling, measurement, wellbore/well components, etc., can solve problems such as difficult evaluation of water-bearing reservoirs

Active Publication Date: 2017-02-15
SHANGHAI SHENKAI GASOLINEEUM TECH +1
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Problems solved by technology

However, C5 of light hydrocarbons is generally analyzed by conventional chromatography, and it is difficult to evaluate water-bearing reservoirs because there is no data of heavy components after C6

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  • While-drilling multi-parameter analysis-based oil-gas-water identification method and system

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Embodiment Construction

[0045] Specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0046] Such as figure 1 As shown, it is a method for identifying oil, gas and water based on multi-parameter analysis while drilling disclosed in the present invention. The method specifically includes the following steps:

[0047] S1. Collect chromatographic signals of reservoir oil, gas, and water while drilling to obtain chromatograms. Analogous to the correlation function of the chromatogram in the field of signal processing, the chromatographic signal is regarded as the output of light hydrocarbon composition distribution in continuous time.

[0048] In this embodiment, the correlation function of the chromatogram is based on 16 light hydrocarbon components of C1-C8 collected by the SK3Q05 chromatograph. The distribution and size of the chromatographic peaks indirectly reflect the composition of oil and gas in the reservoir. Different oil...

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Abstract

The invention discloses a while-drilling multi-parameter analysis-based oil-gas-water identification method. The method comprises the steps that chromatography signals of oil-gas-water in a reservoir stratum are acquired while drilling so that chromatograms are obtained; the cross-correlation function of the oil-gas-water chromatography on a continuous shaft depth and a standard chromatography and water-oil-gas characteristic parameters are obtained according to the chromatograms; and the cross-correlation function is subjected to Fourier inversion to obtain cross-correlation coefficients of any two chromatograms, and reservoir stratums or depths corresponding to the oil-gas-water chromatography signals are identified according to the changing direction of upper-and-lower-layer oil-gas-water features which are reflected by the amplitudes of the cross-correlation coefficients. According to the while-drilling multi-parameter analysis-based oil-gas-water identification method, gasometry chromatography is characterized in that the position of each component is known qualitatively after separation, and the chromatograms are regarded as spectrograms for analogy-analysis and calculation of correlations among the chromatograms and the three characteristic parameters representing the oil-gas-water features; reservoir stratum fluid features can be effectively identified; and the method especially has a very good effect for aquosity.

Description

technical field [0001] The invention relates to an oil-gas-water layer analysis technology, in particular to an oil-gas-water identification method and system based on multi-parameter analysis while drilling. Background technique [0002] Due to the complex composition of oil and gas, and the different degrees of secondary evolution and the influence of geological structures during oil and gas migration, the composition and distribution of oil, gas and water have become more difficult to identify. [0003] Conventional logging parameters are very mature and effective for the interpretation and evaluation of oil, gas and water. However, after a certain operation stage is completed, the data analysis is relatively lagging behind and cannot be used to analyze and evaluate the fluid-bearing properties of the reservoir in real time. Its method is also not suitable for highly deviated wells and horizontal wells. Moreover, the detection depth of general logging instruments is rela...

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Application Information

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IPC IPC(8): E21B49/00E21B47/04
CPCE21B47/04E21B49/00
Inventor 韩性礼王敏杨文飞谢平赖拥斌
Owner SHANGHAI SHENKAI GASOLINEEUM TECH
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