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Method for measuring oil content and water content in drilling fluid through low-field nuclear magnetic resonance

A technology of low-field nuclear magnetic resonance and drilling fluid, which is applied in the field of simultaneous measurement of oil content and water content of drilling fluid by low-field nuclear magnetic resonance, and the measurement of oil content and water content of water-based drilling fluid. It can solve the problem that drilling fluid has not been reported, etc. problem, to achieve the effect of fast test speed, high measurement accuracy and short time consumption

Active Publication Date: 2016-01-06
SUZHOU NIUMAG ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, Suzhou Numai Electronic Technology Co., Ltd. has published a patent on the detection method of drilling fluid oil content, but there is no report on the simultaneous testing of drilling fluid oil content and water content.

Method used

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  • Method for measuring oil content and water content in drilling fluid through low-field nuclear magnetic resonance
  • Method for measuring oil content and water content in drilling fluid through low-field nuclear magnetic resonance
  • Method for measuring oil content and water content in drilling fluid through low-field nuclear magnetic resonance

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Experimental program
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Effect test

Embodiment 1

[0031] 1. Purpose of the test

[0032] Test the effect of manganese chloride on the T2 relaxation time of oil and water, test the relaxation characteristics of drilling fluid and drilling fluid stirred with manganese chloride, and the oil content and water content of drilling fluid.

[0033] 2. Test materials

[0034] Distilled water, manganese chloride, oil, drilling fluid 1#, drilling fluid 2#.

[0035] 3. Test equipment

[0036] PQ001 was produced by Suzhou Newmay Electronic Technology Co., Ltd., the resonance frequency is 23.346MHz, the magnet strength is 0.54T, the probe coil diameter is 25mm, and the experimental temperature is controlled at 31.99~32.01℃.

[0037] 4. Preparation of test samples

[0038] Weigh 1.5g of water to test its T2 relaxation spectrum, add a small amount of manganese chloride crystals in the water and stir well before testing the T2 relaxation spectrum, refer to figure 1 shown;

[0039] Weigh 1.5g of oil to test its T2 relaxation spectrum, add...

Embodiment 2

[0055] Drilling fluid 2# oil content and water content test, combined Figure 7 , Figure 8 , Figure 9 and Figure 10 It can be seen that:

[0056] (1) The relaxation time of drilling fluid 2# is between 0.25 and 100ms,

[0057] (2) After adding manganese chloride and stirring evenly, the relaxation time of water in the drilling fluid is suppressed to before 1ms, and the relaxation time and signal of oil are not affected.

[0058] It can be seen from the principle that adding an appropriate amount of manganese chloride in drilling fluid 2# can shorten the relaxation time of water in drilling fluid 2# to within 1ms, and the signal of oil is after 1ms, so oil and water can be distinguished.

[0059] Crude oil peak area in drilling fluid 2# = peak area after 1ms after manganese saturation, water peak area in drilling fluid 2# = peak area before manganese saturation - peak area after 1ms after manganese saturation, crude oil in drilling fluid 2# Put the peak area and water p...

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Abstract

The invention discloses a method for measuring the oil content and the water content in drilling fluid through low-field nuclear magnetic resonance. Manganese chloride is used so that the relaxation time of water can be shortened, however, the relaxation time of oil is not affected, hence, the oil and the water in the drilling fluid can be distinguished, and quantitative testing of the oil content and the water content in the drilling fluid is achieved. The method includes the steps that nuclear magnetic resonance analysis is conducted on an original sample of the drilling fluid first, and the T2 relaxation spectrum of the original sample of the drilling fluid is tested; then a manganese chloride solution is added into the original sample of the drilling fluid to be fully stirred; afterwards, nuclear magnetic resonance analysis of the manganese-saturated drilling fluid is performed; the peak area of crude oil is the peak area of the manganese-saturated drilling fluid after the relaxation time is 1 ms, the peak area of the water in the drilling fluid is the difference between the peak area before manganese saturation and the peak area of the crude oil, and the peak area of the crude oil and the peak area of the water in the drilling fluid are introduced into corresponding working curve equations so that the oil content and the water content in the drilling fluid can be obtained; at last, the oil content and the water content of the drilling fluid can be obtained by combining the mass of the drilling fluid.

Description

technical field [0001] The invention relates to a method for simultaneously measuring the oil content and water content of drilling fluid by low-field nuclear magnetic resonance, which belongs to the field of nuclear magnetic resonance drilling fluid analysis and is suitable for measuring the oil content and water content of water-based drilling fluid. Background technique [0002] When the formation is drilled, part of the fluid in the pores remains in the rock sample, while the other part enters the drilling fluid. Adsorbed gas, dissolved gas, free gas in drilling fluid, and adsorbed oil and adsorbed gas in rock samples have corresponding mud logging methods to detect, but oil and water in drilling fluid are blank in mud logging detection. The application of PDC bit and rapid drilling technology results in fine cuttings, which are conducive to the transfer of oil, gas and water in solid rock samples to drilling fluid. The free gas in the drilling fluid can be detected by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N24/08
Inventor 杨培强张英力蔡清罗晶
Owner SUZHOU NIUMAG ELECTRONICS TECH
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