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Correlation model algorithm for downhole corrosion rate at wellhead and online monitoring method for downhole corrosion rate using this algorithm

A technology of corrosion rate and correlation model, which is applied in the field of online monitoring of downhole corrosion rate and correlation model algorithm of downhole corrosion rate at the wellhead, can solve the problems of inability to reflect the corrosion process data, large error of test results, long test period, etc., and achieve good promotion and application Prospects, the effect of avoiding safety accidents and reducing losses

Active Publication Date: 2020-07-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CO 2 The corrosion monitoring technology of well flooding can be subdivided into wellhead corrosion and downhole corrosion monitoring. The traditional monitoring method is mainly the hanger (ring) technology. This technology has the characteristics of small economic investment, but its test period is long. The test results are subject to the shortcomings of large errors due to human influence. In addition, the corrosion process data cannot be reflected. The current online corrosion monitoring technology can effectively solve the above technical problems.

Method used

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  • Correlation model algorithm for downhole corrosion rate at wellhead and online monitoring method for downhole corrosion rate using this algorithm
  • Correlation model algorithm for downhole corrosion rate at wellhead and online monitoring method for downhole corrosion rate using this algorithm
  • Correlation model algorithm for downhole corrosion rate at wellhead and online monitoring method for downhole corrosion rate using this algorithm

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] (1) Correlation model algorithm of downhole corrosion rate at wellhead and online monitoring method of downhole corrosion rate using this algorithm.

[0067] (2) CO 2 Research on the law of flooding and corrosion:

[0068] 1. Steel material for corrosion test:

[0069] In the corrosion experiment, the materials of the inductance probe and the coupon are all common steels for oil field oil casing, including J55, N80 and A3 steels. The chemical composition of each steel is analyzed as follows:

[0070] The chemical composition of A3 steel in the experiment is shown in Table 2-1:

[0071] Table 2-1 Chemical composition (%) of A3 steel used in experiments

[0072]

[0073] The chemical composition of N80 steel used in the experiment is shown in Table 2-2:

[0074] Table 2-2 The chemical composition (%) of N80 steel used in the experiment

[0075]

[0076] The chemical composition of J55 steel used in the experiment is shown in Table 2-3:

[0077] Table 2-3 The ...

Embodiment 2

[0237] Embodiment 2, research on correlation between wellhead and downhole corrosion rate:

[0238] Since a large number of downhole corrosion rate tests have been carried out above, two technical routes are proposed for the prediction of downhole corrosion conditions, and the technical advantages and disadvantages are finally determined through laboratory and field verification.

[0239] Technical route 1: Figure 15 through the existing CO 2 The screening and correction of the prediction model directly predicts the corrosion rate at the wellhead and downhole. If a correlation can be established through a certain corrosion influencing factor, such as salinity, the research purpose is achieved. If it cannot be correlated, the corrosion influencing factor can also be directly applied Correlation data for direct prediction of corrosion.

[0240] Technical route 2: To avoid the influence of various influencing factors on the downhole corrosion rate, directly measure the downhol...

Embodiment 3

[0361] Example 3. Application examples from here on.

[0362] CO 2 Research on application of flooding online corrosion monitoring system.

[0363] 1. Research on the application of corrosion monitoring in the 1# experimental well of Binnan No. 1 Coal Mine.

[0364] The test start time of 1# test well was December 7, 2015.

[0365] (1) Installation of wellhead monitoring equipment and data analysis.

[0366] The on-site working conditions of the 1# experimental well of Binnan No. 1 Coal Mine are (December 2015):

[0367] Wellhead temperature: 18°C, total wellhead pressure: 0.5Mpa, sucker rod stroke: 3m, sucker rod stroke times: 4, daily liquid production: 31.8t, daily water production: 27t, crude oil water content: 85%.

[0368] The liquid and gas sampling and analysis data of the produced fluid of the 1# test well are as follows (analysis time: December 23, 2015).

[0369] Table 3-1 Gas analysis results of produced fluid in 1# test well

[0370]

[0371] Table 3-2 Li...

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Abstract

The invention provides a wellhead and down hole corrosion rate correlation model algorithm and an on-line down hole corrosion rate monitoring method using the same. The correlation between a corrosion rate at different down hole depths and a wellhead corrosion rate is determined through experimental research, and the wellhead and down hole corrosion rate correlation model algorithm is established. Further, the corrosion rate at different down hole depths is calculated by utilizing the wellhead corrosion rate. A new compensation method is studied to solve the problem that a relationship between a measured value of a thick-walled cylindrical inductance probe test block and an original inductance probe mathematic model curve departs from a linear relationship, so as to realize on-line monitoring of the wellhead corrosion rate, and solve the problem that the corrosion condition of equipment down hole cannot be effectively monitored. Significant economic and social benefits, and good promotion and application prospects are realized.

Description

technical field [0001] The invention belongs to the technical field of oil field monitoring, and in particular relates to a wellhead downhole corrosion rate correlation model algorithm and an online monitoring method for downhole corrosion rate using the algorithm. Background technique [0002] CO 2 It was first used as an additive for acidizing and fracturing treatment in 1962, and its use has been rapidly developed as an oil well treatment medium since then. With deep CO 2 Development of oil and gas fields and reinjection of CO in tertiary oil recovery 2 Wide application of enhanced oil recovery (EOR), CO 2 Corrosion problems have always plagued the development of the oil and gas industry. CO 2 The produced fluid from the flooding well is rich in CO 2 , Water will cause severe corrosion of downhole equipment in production wells. According to preliminary screening, in Shengli Oilfield, it is suitable for CO 2 The reserves of low-permeability oilfields for oil displa...

Claims

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Application Information

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IPC IPC(8): G01N5/04G01N33/00
CPCG01N5/04G01N33/00
Inventor 刘晶姝龙媛媛谭晓林杨为刚刘瑾刘丽柳言国
Owner CHINA PETROLEUM & CHEM CORP
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