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Deepwater stratum parameter prediction method based on marine riser external gas content monitoring

A technology of formation parameters and prediction methods, which is used in surveying, earth-moving drilling, special data processing applications, etc., to prevent well kicks and blowouts

Active Publication Date: 2021-12-17
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the extremely complex downhole situation, there is currently no method for predicting formation parameters after overflow, especially in deep water based on the monitoring of gas content outside the riser.

Method used

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  • Deepwater stratum parameter prediction method based on marine riser external gas content monitoring
  • Deepwater stratum parameter prediction method based on marine riser external gas content monitoring
  • Deepwater stratum parameter prediction method based on marine riser external gas content monitoring

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Embodiment 1

[0054] Embodiment 1, the present invention provides a deep-water formation parameter prediction method based on monitoring the gas content outside the riser, according to figure 1 The flow chart of the method shown, by establishing the wellbore gas-liquid two-phase flow calculation model, can obtain the corresponding relationship between formation parameters (permeability, etc.) Based on the gas rate monitoring results, the formation parameters (permeability, etc.) are predicted by using the chart, and then the gas content monitoring of deep water wells and the prediction of formation parameters are realized.

[0055] The specific method is as follows:

[0056] 1. Obtain parameters of deep water wells

[0057] Including: water depth h, well depth H, seawater surface temperature T, circulation displacement L, drilling fluid physical density ρ, original formation pressure P o ;

[0058] 2. Establish the gas-liquid two-phase flow calculation model in the wellbore, including th...

Embodiment 2

[0097] The formation parameter prediction method based on the monitoring of the gas content outside the riser after the overflow of the deep water well mentioned in the present invention, the specific process is:

[0098] 1. Obtain the parameters of deep water wells:

[0099] Including: water depth h=1500m, well depth H=3500m, seawater surface temperature T=105℃, circulating displacement L=30L / S, drilling fluid physical density ρ=1.2g / cm 3 , original formation pressure P o =33MPa.

[0100] 2. Establish a wellbore gas-liquid two-phase flow calculation model, and draw a chart according to the calculation model and deepwater well parameters:

[0101] Establish a gas-liquid two-phase flow model in deepwater wells, including the continuity equation and momentum equation of gas-liquid two-phase, set formation parameters (permeability, etc.), and calculate the corresponding relationship between gas content and formation parameters (permeability, etc.) , set the formation parameter...

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Abstract

The invention relates to a deepwater stratum parameter prediction method based on marine riser external gas content monitoring, and the technical scheme is as follows: 1, according to a pre-established wellbore gas-liquid two-phase flow calculation model, an on-way friction resistance equation, a gas-liquid two-phase density equation and a gas content calculation equation, obtaining a corresponding relation between the gas content and stratum parameters; 2, according to the obtained corresponding relation between the gas content and the stratum parameters, drawing a chart of the corresponding relation between the gas content and the stratum parameters, predicting the stratum parameters, and identifying and predicting the shaft overflow condition; the method has the beneficial effects that the Doppler ultrasonic monitoring technology and marine riser gas content monitoring are combined, the corresponding relation chart of the stratum parameters and the gas content is obtained based on the two-phase flow calculation model after gas cut during drilling, and the stratum parameters are predicted by utilizing the chart in combination with the marine riser gas content monitoring result, and the stratum parameters for monitoring the external gas content of the deep well marine riser can be predicted.

Description

technical field [0001] The invention relates to the technical field of oil and gas development, in particular to a deep-water formation parameter prediction method based on the monitoring of gas content outside a riser. Background technique [0002] As the exploration and development of oil and gas wells gradually face areas with complex geological conditions such as deep sea, drilling often encounters abnormally high-pressure formations, which are prone to gas invasion and frequent drilling accidents such as blowouts, which seriously affect the drilling process and even lead to drilling safety accidents. Therefore, the prevention and control of blowout is becoming more and more important in the process of deepwater drilling. [0003] Early monitoring of gas kick is an important part of well control, which is of great significance for improving the success rate of well control. The earlier gas kick is detected, the smaller the change in bottomhole pressure, and the easier it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20E21B47/00E21B49/00
CPCG06F30/20E21B47/00E21B49/00
Inventor 尹邦堂赵静张伟王志远孙宝江高永海李昊王雪瑞孙小辉
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)