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A method for detecting the conversion degree of oil-based drilling fluid

A technology of oil-based drilling fluid and detection method, which is applied to measurement devices, material analysis by electromagnetic means, instruments, etc., can solve the interruption of the conversion construction process, difficulty in accurately judging the complete conversion of oil-based drilling fluid, and difficulty in maintenance and processing, etc. problem, to achieve the effect of easy operation, good reliability and practicality

Active Publication Date: 2018-04-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the deviation of displacement measurement or the interruption of the conversion process, the existing methods are difficult to accurately judge whether the oil-based drilling fluid has been completely converted.
As a result, the conversion of oil-based drilling fluid is either not completely converted, so that a large amount of water-based drilling fluid is mixed into it, resulting in large fluctuations in the performance of oil-based drilling fluid and making maintenance and treatment difficult; or the oil-based drilling fluid has been Complete conversion, but not detected, resulting in a large amount of oil-based drilling fluid wasted

Method used

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  • A method for detecting the conversion degree of oil-based drilling fluid
  • A method for detecting the conversion degree of oil-based drilling fluid
  • A method for detecting the conversion degree of oil-based drilling fluid

Examples

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Embodiment 1

[0031] In view of the defect that the observation method or the displacement calculation method cannot accurately judge whether the conversion of the oil-based drilling fluid is completed, this embodiment provides a method for detecting the conversion degree of the oil-based drilling fluid based on the demulsification voltage of the oil-based drilling fluid , figure 1 A flowchart of the method is shown.

[0032] In this example, the water-based drilling fluid of Well X1 in the Sichuan Basin is converted into diesel-based drilling fluid, where the wellbore volume of Well X1 is 140m 3 , the total capacity of the surface circulation system is 320m 3 .

[0033] Such as figure 1 As shown, in this embodiment, firstly, in step S101 of determining the parameter configuration value, the preset parameters of the prepared oil-based drilling fluid are measured to obtain the preset parameters of the oil-based drilling fluid.

[0034] In this embodiment, the volume of the prepared oil-b...

Embodiment 2

[0048] In this example, the method provided by the present invention is used to convert the water-based drilling fluid of Well X2 in the Tarim Basin into a mineral oil-based drilling fluid, so as to further illustrate the purpose, principle and advantages of the present invention.

[0049] Well X2 in the Tarim Basin has a shaft capacity of 220m 3 , the total capacity of the surface circulation system is 200m 3 . Since the total capacity of the surface circulation system is smaller than the wellbore capacity of Well X2, the oil-based drilling fluid cannot be pumped in one time, but needs to be pumped into the drilling fluid circulation system twice, so that the conversion can be completed .

[0050] figure 2 A flow chart of the method for detecting the conversion degree of oil-based drilling fluid provided in this embodiment is shown.

[0051] Such as figure 2 As shown, the present embodiment first prepares 160m in the on-site ground circulation system in step S201 3 Af...

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Abstract

The invention discloses a detection method of a transition degree of oil-based drilling fluid. The detection method comprises: determining a parameter preparation value: measuring the parameter of the preset oil-based drilling fluid according to the prepared oil-based drilling fluid to obtain the parameter preparation value of the preset oil-based drilling fluid; determining a parameter test value: injecting the oil-based drilling fluid into a drilling fluid circulating system if the preparation value is more than a first preset parameter threshold value, testing the preset oil-based drilling fluid parameter of a returning fluid in the drilling fluid circulating system every other first preset time in the injection process to obtain the parameter test value of the preset oil-based drilling fluid; and determining the transition degree: comparing the test value with a second preset parameter threshold value, and determining the transition degree of the oil-based drilling fluid according to the comparison result. The detection method can accurately determine whether the drilling fluid circulating system completes the transition of the oil-based drilling fluid, and is convenient for on-site staff to operate.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration and development, in particular to a method for detecting the conversion degree of oil-based drilling fluid. Background technique [0002] Oil-based drilling fluid is a kind of drilling fluid whose oil phase is continuous phase (base oil), which has many advantages such as strong inhibition, excellent lubricity, stability of wellbore wall and protection of oil and gas reservoirs. Although oil-based drilling fluid has the disadvantage of high cost, it is still an effective means for analyzing complex formations in the drilling field. Oil-based drilling fluid is widely used in the drilling process abroad, and it has also been widely used in the drilling process of shale horizontal well formations in China in recent years. [0003] In the process of field application, the prepared oil-based drilling fluid is usually pumped into the wellbore through the drill pipe, so as to gradually c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/00
Inventor 王显光李胜李雄何恕林永学
Owner CHINA PETROLEUM & CHEM CORP
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