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

A technique for drilling fluid and oil content, which is applied in the field of low-field nuclear magnetic resonance to measure the oil content of drilling fluid, which can solve the problems of reduced accuracy and achieve the effects of improved accuracy, fast testing speed, and short time consumption

Active Publication Date: 2012-02-22
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] Embodiment: The present invention discloses a method for measuring the oil content of drilling fluid by low-field nuclear magnetic resonance, and its specific implementation steps are as follows:

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

[0033] 2) Sample standard sample: If the non-overlapping part of crude oil and drilling fluid is proportional to the oil content of the mixed fluid in the mixed fluid, this part is selected as the standard sample signal; if the non-overlapping part of crude oil and drilling fluid is in the mixed fluid If t...

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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 in particular relates to a method for measuring the oil content of drilling fluid by low-field nuclear magnetic resonance. Background technique [0002] Mud logging technology is the most timely and direct means to discover and evaluate oil reservoirs, and is known as the "eye" that goes deep into the ground. Drilling fluid, as the "blood" of drilling, can assist people to obtain first-hand information of formation information at the mud logging site. After the formation is drilled, part of the pore fluid enters the drilling fluid, and gas and water are detected by corresponding mud logging methods, but the oil in the drilling fluid is always blank in mud logging. 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 relativel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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