Well head and well bottom pressure conversion method for shale gas horizontal well under two-phase flow conditions

Abstract

The invention discloses a well head and well bottom pressure conversion method for a shale gas horizontal well under two-phase flow conditions. The well head and well bottom pressure conversion method comprises the step of logging data, such as daily output, pressure and temperature of a production well head based on the condition that a well shaft of a shale gas production well has two phases of gas and liquid. The flowing states of the well shaft of a vertical section and a horizontal section of a gas well are analyzed by taking the influence of factors, such as nonlinear change of gas, a slippage effect and pipe wall frictional resistance, into consideration, and integrating a testing result of a production profile of the production well, so that a two-phase flow pipe flow model is selected, and well head and well bottom pressure conversion is carried out. According to the well head and well bottom pressure conversion method for the shale gas horizontal well under the two-phase flow conditions, the technical difficult problems about flow state distribution characteristics of the well shaft of the shale gas horizontal well are effectively solved by fully and comprehensively utilizing production dynamic monitoring data, and a foundation is laid for converting well head and well bottom pressure in the next step. Meanwhile, a result is verified by adopting underground permanent monitoring data and output profile test data; the well head and well bottom pressure conversion method has the characteristics that the method is innovative, the thought is rigorous, the application is simple, and the analysis results are accurate and reliable.

Description

technical field [0001] The invention relates to the field of oil and gas field exploitation, in particular to a wellhead and bottomhole pressure conversion method under the two-phase flow condition of a shale gas horizontal well. Background technique [0002] At present, shale gas wells are mainly completed by multi-stage staged perforation bridge plugging and large-scale hydraulic fracturing technology. During the production process, due to the flowback of fracturing fluid, the production process is affected by gas slippage, pipe wall friction, and gas nonlinear changes. Influenced by factors such as conditions and technical adaptability, it is difficult to obtain accurate bottomhole flow pressure data. At the same time, in the process of domestic shale gas development, there are few permanent monitoring data of production wells downhole, and the existing empirical relational formula has large calculation errors, which cannot meet the requirements of further production dyn...

AI Technical Summary

Problems solved by technology

During the production process, due to the flowback of fracturing fluid, the production process is affected by gas slippage, pipe wall friction, and gas nonlinear changes. Influenced by factors such as conditions and technical adaptability, it is difficult to obtain accurate bottomhole flow pressure data

At the same time, in the process of domestic shale gas development, there are few downhole permanent monitoring data of production wells, and the existing empirical relational formula has large calculation errors, which cannot meet the requirements of further production dynamic analysis and evaluation

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