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Method for measuring oil content of drilling fluid through low-field NMR (Nuclear Magnetic Resonance)

A drilling fluid and oil content technology, which is applied in the field of low-field nuclear magnetic resonance measurement of drilling fluid oil content, can solve problems such as reduced accuracy, and achieve the effects of improved accuracy, fast testing speed, and short time-consuming.

Active Publication Date: 2011-01-12
SUZHOU NIUMAG ELECTRONICS TECH
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Problems solved by technology

However, the crude oil obtained in actual mud logging is a mixture of various oils, and its relaxation time spectrum is relatively wide, which easily overlaps with the relaxation time of the drilling fluid, and the accuracy of only measuring the lateral relaxation will be greatly reduced

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  • Method for measuring oil content of drilling fluid through low-field NMR (Nuclear Magnetic Resonance)
  • Method for measuring oil content of drilling fluid through low-field NMR (Nuclear Magnetic Resonance)
  • Method for measuring oil content of drilling fluid through low-field NMR (Nuclear Magnetic Resonance)

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Embodiment

[0031] Example: The present invention discloses a method for measuring the oil content of drilling fluid by low-field nuclear magnetic resonance. The specific implementation steps are as follows:

[0032] 1)Sample analysis: Perform lateral relaxation analysis on crude oil and drilling fluid through CPMG sequence, and use one-dimensional inverse Laplace algorithm as the lateral relaxation time spectrum inversion algorithm to obtain the relaxation time spectrum of crude oil and drilling fluid , If the relaxation time spectra of the two do not completely overlap, then perform transverse relaxation analysis on their mixture and obtain the relaxation time spectrum;

[0033] 2) Sample standard sample: If the part that does not overlap between crude oil and drilling fluid is proportional to the oil content of the mixture in the mixed fluid, select this part as the standard sample signal; if the part that does not overlap between the crude oil and the drilling fluid is the same in the mixtu...

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Abstract

The invention discloses a method for measuring the oil content of drilling fluid through low-field NMR (Nuclear Magnetic Resonance), suitable for measuring the content of crude oil with different densities in the drilling fluid. The method comprises the step of measuring the oil content of the drilling fluid by using the transverse relaxation time of the crude oil and the drilling fluid and different diffusion coefficients as main identification criteria, using the signal strength of NMR of the crude oil and the drilling fluid as a main observation object and using the transverse relaxation analysis of the drilling fluid and the correlation analysis of the diffusion coefficients and transverse relaxation as main measures. The method of the invention has the advantages of high measuring result accuracy, good stability, short time consumption, and the like, is easy to realize the online measurement of the oil content of the drilling fluid and provides reliable storage information of an oil layer for logging operation.

Description

Technical field [0001] The invention belongs to the field of nuclear magnetic resonance drilling fluid analysis, and specifically relates to a method for measuring the oil content of drilling fluid by low-field nuclear magnetic resonance. Background technique [0002] Logging technology is the most timely and direct method for discovering and evaluating oil reservoirs, and is called the "eye" deep underground. As the "blood" of drilling, drilling fluid can assist people to obtain first-hand information of formation at the logging site. After the formation is drilled, a part of the pore fluid enters the drilling fluid, and gas and water have corresponding logging methods to detect. Only the oil in the drilling fluid has always been a logging blank. Domestic and foreign data and experiments show that nuclear magnetic resonance logging technology will be an effective detection method. Especially in deep exploration, the oil quality is relatively light, and the amount of drilling f...

Claims

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Application Information

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IPC IPC(8): G01N24/08
Inventor 杨培强张英力王志战俞文文
Owner SUZHOU NIUMAG ELECTRONICS TECH
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