Method for analyzing oil mass fraction of drilling well fluid by nuclear magnetic resonance

A technology of mass fraction and nuclear magnetic resonance, which is applied in the field of oily analysis of drilling fluid in petroleum drilling, can solve the problems of large randomness of oil concentration in drilling fluid, large error of detection results, and unrepresentative, etc., and achieve authentic results

Inactive Publication Date: 2010-05-26
中国石化集团华北石油局有限公司
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AI Technical Summary

Problems solved by technology

The use of fluorescence spectrometer to detect the oil concentration of drilling fluid is random, not representative, and the error of the detection result is large

Method used

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  • Method for analyzing oil mass fraction of drilling well fluid by nuclear magnetic resonance
  • Method for analyzing oil mass fraction of drilling well fluid by nuclear magnetic resonance
  • Method for analyzing oil mass fraction of drilling well fluid by nuclear magnetic resonance

Examples

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Effect test

example 1

[0031] Example 1: NMR analysis while drilling of well HH266 in the Yanchang Formation of the Triassic in the southern Ordos Basin

[0032] The present invention utilizes nuclear magnetic resonance technology to analyze the method for oily mass fraction of drilling fluid, including nuclear magnetic resonance analysis instrument calibration, drilling fluid oily mass fraction work curve making Establishment of drilling fluid oil mass fraction working curves for two layers), drilling fluid sample collection, processing and NMR analysis, and calculation of drilling fluid oil mass fraction parameters. Specific steps are as follows:

[0033] (1) Debugging and calibration of NMR analysis instruments

[0034] 1. The analysis instrument is UNIQ PMR pulse nuclear magnetic resonance analyzer, version 3.0 software. This instrument is one of the most advanced nuclear magnetic resonance analysis instruments used in the petroleum field in China. The instrument is stable, the calibration li...

example 2

[0081] Example 2: NMR analysis while drilling of well HH26-7 in the Yanchang Formation of the Triassic in the southern Ordos Basin

[0082] The same method as Example 1 was used to carry out NMR logging while drilling in well HH26-7.

[0083] Table 4 is the analysis data table of oily mass fraction of drilling fluid by NMR. The "sample depth" in the table is the depth of the drilling fluid collected while drilling, which is late to the well depth; "Oil content mass fraction (%)" is the data of oil content mass fraction of drilling fluid calculated according to the corresponding formation formula.

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Abstract

The invention relates to a method for analyzing the crude oil mass fraction in the drilling well fluid by a nuclear magnetic resonance technology. On the basis of the theory for measuring the oil content by nuclear magnetic resonance, the method realizes the quantitative analysis of the oil mass fraction of the drilling well fluid in a petroleum drilling well by a nuclear magnetic resonance analytical instrument through manufacturing a working curve of the oil mass fraction of the drilling well fluid in a target layer and carrying out the nuclear magnetic resonance continuous analysis of the drilling well fluid along the drilling. The method comprises the steps of calibrating by the nuclear magnetic resonance analytical instrument, manufacturing the working curve of the oil mass fraction of the drilling well fluid, collecting and processing a drilling well fluid sample, analyzing by nuclear magnetic resonance and solving the oil mass fraction in the drilling well fluid. After being applied, the invention can accurately detect the oil content of the drilling well fluid, analyze the drilling well fluid in the well drilling process in time at the well drilling scene, obtain the analytical data of the oil content of the drilling well fluid in time and achieve the quantitative evaluation on the oiliness of a storing and collecting layer, has real, accurate and reliable measured data and provides technology support for the exploration, development and production of petroleum in time.

Description

1. Technical field [0001] The invention relates to a method for analyzing the oiliness of drilling fluid in petroleum drilling, in particular to a method for analyzing the mass fraction of crude oil in drilling fluid by using nuclear magnetic resonance technology. 2. Background technology [0002] In oil drilling, there are three kinds of physical data that can reflect the oiliness of reservoirs: core, cuttings and drilling fluid. At present, there are many methods for quantitative analysis of core oiliness, and the accuracy is high. Methods for analyzing the oiliness of cuttings include quantitative fluorescence analysis, nuclear magnetic resonance analysis, etc., which are relatively mature and are currently in the stage of promotion and application. There are few analysis methods for the oiliness of drilling fluid, and most of them are indirect qualitative analysis methods, such as gas logging method to qualitatively infer the oiliness of the reservoir according to the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N24/08
Inventor 陈英毅王飞龙周天顺何国贤周小勇张建伍谢元军王小洋
Owner 中国石化集团华北石油局有限公司
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