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Fast crude oil viscosity measurement method

A measurement method and viscosity technology, which is applied in the field of rapid measurement of crude oil viscosity, can solve problems such as inaccurate viscosity data, and achieve the effect of improving detection efficiency and accurate viscosity measurement

Active Publication Date: 2016-02-24
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a rapid measurement method of crude oil viscosity, which is used to solve the measurement method in the prior art. During the process of collecting and transporting crude oil samples from downhole to the surface laboratory, the viscosity of the sample changes with the change of temperature and pressure, resulting in the measured The viscosity data is not accurate technical problem

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Experimental program
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Effect test

Embodiment 1

[0020] figure 1 It is a flow chart of Embodiment 1 of the rapid measurement method for crude oil viscosity of the present invention, as figure 1 As shown, a kind of crude oil viscosity rapid measurement method that the present embodiment provides, comprises:

[0021] Step 101, transmit a DEFIR pulse sequence and an FIR pulse sequence to the sample under test, and measure the echo signal of the DEFIR pulse sequence and the echo signal of the FIR pulse sequence;

[0022] Step 102, according to the echo signal of the DEFIR pulse sequence and the echo signal of the FIR pulse sequence, obtain the longitudinal relaxation time T 1 and the transverse relaxation time T 2 distribution data between;

[0023] Step 103, obtaining the viscosity of the tested sample according to the distribution data.

[0024] where the longitudinal relaxation time T 1 and the transverse relaxation time T 2 The distribution data between can be characterized as T 1 with T 2 The distribution data of th...

Embodiment 2

[0034] In order to make the crude oil viscosity rapid measurement method more specific, this embodiment further defines the crude oil viscosity rapid measurement method on the basis of the first embodiment. figure 2 For the flow chart of Embodiment 2 of the rapid measurement method for crude oil viscosity of the present invention, please refer to figure 2 , in this embodiment, according to the echo signal of the DEFIR pulse sequence and the echo signal of the FIR pulse sequence, T 1 with T 2 The distribution data between, specifically include:

[0035] Step 1021, obtain T according to the echo signal of the DEFIR pulse sequence and the echo signal of the FIR pulse sequence 1 distribution with T 1 / T 2 The functional relationship of the distribution;

[0036] Step 1022, according to the T 1 distribution with T 1 / T 2 The functional relationship of the distribution, get T 1 -T 2 distributed;

[0037] Specifically, according to the T 1 distribution with T 1 / T 2 T...

Embodiment 3

[0087] In order to make the crude oil viscosity rapid measurement method more specific, this embodiment further defines the crude oil viscosity rapid measurement method on the basis of the second embodiment. image 3 For the flow chart of Embodiment 3 of the rapid measurement method for crude oil viscosity of the present invention, please refer to image 3 , in this embodiment, according to the echo signal of the DEFIR pulse sequence and the echo signal of the FIR pulse sequence, the distribution data between T1 and T2 is obtained, specifically including:

[0088] Step 1023, obtain T according to the echo signal of the DEFIR pulse sequence and the echo signal of the FIR pulse sequence 1 distribution with T 1 / T 2 The functional relationship of the distribution;

[0089] Step 1024, according to the T 1 distribution with T 1 / T 2 The functional relationship of the distribution, get T 1 / T 2 distributed. Specifically, according to the T 1 distribution with T 1 / T 2 Th...

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Abstract

The present invention discloses a fast crude oil viscosity measurement method which is as follows: a DEFIR pulse sequence and a FIR pulse sequence are transmitted to a to-be-tested sample, a DEFIR pulse sequence echo signal and a FIR pulse sequence echo signal are measured; longitudinal relaxation time T1 and transverse relaxation time T2 distribution data can be obtained according to the DEFIR pulse sequence echo signal and the FIR pulse sequence echo signal; and the viscosity of the to-be-tested sample can be obtained according to the distribution data. According to the method, real-time on-site viscosity measurement of a reservoir fluid can be achieved, the method makes up the defect that by the traditional fluid viscosity measurement method, the fluid needs to be collected from a reservoir to the ground, on the one hand the detection efficiency is improved; on the other hand viscosity changes caused by ambient temperature and pressure changes in the process of the delivery of the fluid from the reservoir to a ground laboratory can be avoided, and the viscosity measurement is more accurate.

Description

technical field [0001] The invention relates to the measurement of nuclear magnetic resonance of fluids, in particular to a method for rapidly measuring the viscosity of crude oil. Background technique [0002] In oil field production, the viscosity of crude oil can reflect the internal frictional resistance of crude oil during the flow process. Therefore, the measurement of downhole fluid viscosity can provide scientific basis for the development of oil fields and the flow calculation of crude oil in formations, wellbores and oil pipelines. The extraction of oil fields has a very important impact. [0003] The commonly used crude oil viscosity measurement method is to collect reservoir crude oil samples from downhole, then transport them to the surface, and then use a viscosity measuring instrument for measurement. [0004] However, this measurement method will cause the viscosity of the sample to change with temperature and pressure during the process of collecting and tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/00G01N24/08
CPCG01N11/00G01N24/081G01N2011/0046
Inventor 肖立志邓峰廖广志
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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