Riser-free drilling well gas cut characteristic dynamic analysis method
An analysis method and riser technology, which can be used in earth-moving drilling, wellbore/well components, special data processing applications, etc., and can solve problems such as being unsuitable for riserless drilling.
Pending Publication Date: 2021-06-25
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology
Although riserless drilling has many potential advantages in deepwater drilling, there are also many unresolved issues: such as well control safety issues caused by gas kick during drilling
Therefore, the existing wellbore gas invasion prediction model for conventional drilling is not suitable for riserless drilling, and cannot be directly applied to the gas invasion analysis of riserless drilling
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[0176] Taking a deepwater drilling well in a certain oil reservoir as an example, the basic parameters of the well are shown in Table 1.
[0177] Table 1. Basic parameters for simulating ultra-deep water gas wells
[0178]
[0179]
[0180] According to the basic data of the deepwater drilling, solve the numerical model to obtain the wellbore temperature and pressure distribution of the riserless drilling, and take another conventional drilling close to the oil reservoir as a comparison example to obtain the wellbore temperature and pressure distribution of the conventional drilling , the result is as Figure 4 shown. It can be seen from the figure that the riserless drilling above the mudline drillpipe fluid temperature drops more sharply than that of conventional drilling, which is due to the lack of casing and annulus between the drillpipe and seawater, resulting in annulus and return The fluid temperature inside the pipeline is lower than that of conventional drill...
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The invention discloses a riser-free drilling well gas cut characteristic dynamic analysis method, which relates to the technical field of oil and gas development, and comprises the following steps: S1, establishing a gas phase continuity equation, a liquid phase continuity equation and a momentum equation; S2, establishing a numerical model of the two-phase fluid in the shaft of the target well; S3, according to the heat transfer characteristic between the drill rod and seawater, establishing a drill rod inner heat transfer model and an annular heat transfer model of the target well; and S4, setting and substituting initial conditions and boundary conditions into the drill rod inner heat transfer model and the annulus heat transfer model, and discretely solving a numerical model of two-phase flow fluid in each area. According to the method, the numerical model of the gas-liquid two-phase flow in the drilling well is established, the temperature of the drilling fluid is calculated through the heat transfer model, then the fluid parameters of the gas phase in the drilling well are obtained, the fluid parameters are substituted into the numerical model for discrete iteration solving, and the flowing characteristics of the gas-liquid two-phase flow in the shaft after the drilling well without the marine riser is subjected to gas cut are obtained. The method is suitable for technical reference of on-site operation of drilling without a marine riser.
Description
technical field [0001] The invention relates to the technical field of oil and natural gas development, in particular to a method for dynamic analysis of gas-invasion characteristics of riser-free drilling. Background technique [0002] The dual-gradient drilling technology is a technology that emerged in recent years to solve the safety problem caused by the narrow pressure window in the process of deepwater drilling. Dual-gradient drilling mainly includes subsea pump lift drilling, dual-density drilling, and riserless drilling. Among them, in deepwater drilling, compared with other drilling methods, riserless drilling has the advantages of low drilling cost, no water depth limit, less mud consumption, and easy upgrading of drilling platforms because no riser is used. Although riserless drilling has many potential advantages in deepwater drilling, there are also many unresolved issues: such as well control safety issues caused by gas kick during drilling. [0003] At pres...
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Patent Timeline
Login to View More IPC IPC(8): G06F30/20E21B47/00G06F17/11G06F113/08G06F119/08
CPCG06F30/20E21B47/00G06F17/11G06F2113/08G06F2119/08
Inventor 毛良杰甘伦科蔡明杰王国荣曾松
Owner SOUTHWEST PETROLEUM UNIV