A method for measuring oil content and water content of drilling fluid by low-field nuclear magnetic resonance

A low-field nuclear magnetic resonance, drilling fluid technology, applied in low-field nuclear magnetic resonance to simultaneously measure the oil content and water content of drilling fluids, the measurement of oil content and water content in water-based drilling fluids, and can solve the problem that drilling fluids have not been reported, etc. problem, to achieve the effect of fast test speed, good stability and high measurement accuracy

Active Publication Date: 2017-08-15
SUZHOU NIUMAG ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A method for measuring oil content and water content of drilling fluid by low-field nuclear magnetic resonance
  • A method for measuring oil content and water content of drilling fluid by low-field nuclear magnetic resonance
  • A method for measuring oil content and water content of drilling fluid by 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 with 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 ...

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Abstract

The invention discloses a method for measuring the oil content and water content of drilling fluid by low-field nuclear magnetic resonance. Manganese chloride can shorten the relaxation time of water without affecting the relaxation time of oil to distinguish oil and water in drilling fluid. , so as to quantitatively test the oil content and water content of the drilling fluid. First, carry out nuclear magnetic resonance analysis on the original sample of the drilling fluid, and test the T2 relaxation spectrum of the original sample of the drilling fluid. Then, add manganese chloride solution to the original sample of the drilling fluid and stir thoroughly. Carry out the NMR analysis of the drilling fluid after manganese saturation then, wherein the peak area of ​​crude oil is the peak area after the drilling fluid relaxation time is 1ms after the manganese saturation, and the peak area of ​​water in the drilling fluid is the peak area before the manganese saturation - the peak area of ​​crude oil Peak area, the oil content and water content of the drilling fluid can be obtained by bringing the peak area of ​​crude oil and the peak area of ​​water in the drilling fluid into the corresponding working curve equation, and finally the oil content of the drilling fluid can be obtained by combining the quality of the drilling fluid and moisture content.

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 Patents(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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