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Coupling calculation method of deepwater gas-liquid two-phase flow circulating temperature and pressure

A technology of circulating temperature and calculation method, applied in the direction of calculation, special data processing application, instrument, etc., can solve the problem of not considering pressure and cannot be used to simulate the temperature and pressure field of deep water gas-liquid two-phase flow, etc.

Inactive Publication Date: 2015-02-18
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

However, the existing method solves the gas-liquid two-phase flow cycle temperature and pressure separately, does not consider the pressure when calculating the temperature field, and considers the drilling fluid at a constant temperature when calculating the pressure, which is inconsistent with deep-sea drilling conditions and cannot be used to simulate deep-water gas-liquid two-phase Flow temperature and pressure field

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  • Coupling calculation method of deepwater gas-liquid two-phase flow circulating temperature and pressure
  • Coupling calculation method of deepwater gas-liquid two-phase flow circulating temperature and pressure
  • Coupling calculation method of deepwater gas-liquid two-phase flow circulating temperature and pressure

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Embodiment Construction

[0079] The method of the present invention will be described in further detail below in conjunction with the specific embodiments of the accompanying drawings.

[0080] The physical model of deepwater drilling operations such as figure 1 As shown, the upper part is surrounded by seawater, and the lower part is surrounded by formations. When the gas-liquid two-phase flow circulates in the wellbore, according to the heat transfer process, the solution area of ​​the model is divided into five areas: (1) The fluid area in the drill string, where the two-phase flow drilling fluid flows into the drill string from the drilling pump and flows along the drill string. Down to the bottom of the well; ②The annular area between the drill string and the well wall, the two-phase flow drilling fluid enters the annulus from the bottom of the well, flows upwards, and reaches the wellhead; ③The wellbore / formation (sea water) interface area, the wellbore and the formation The interface with seaw...

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Abstract

The invention discloses a coupling calculation method of deepwater gas-liquid two-phase flow circulating temperature and pressure. The coupling calculation method comprises the following steps: (1) calculating the vertical coordinate of a grid; (2) applying the initial condition; and (3) from the beginning of an original value, carrying out iterative calculation on node temperature and pressure data of drill string drilling fluid and annulus drilling fluid in sequence, until the temperature and the pressure reach the condition of convergence, finishing the iteration, and saving and outputting the last-time iterative calculation result as the final deep sea gas-liquid two-phase flow shaft temperature and pressure simulation result, wherein the iteration is named as a global iteration. The coupling calculation method improves the calculation precision.

Description

technical field [0001] The invention relates to a temperature and pressure calculation method, in particular to a deep water gas-liquid two-phase flow circulation temperature and pressure coupling calculation method. Background technique [0002] With the application of underbalanced technology in onshore oilfields becoming more and more mature, in recent years, in order to increase the productivity of offshore oil wells, reduce the pollution of oil and gas layers during drilling, or solve the problem of lost circulation, underbalanced drilling technology has begun to be used to develop offshore oilfields. When aerated drilling fluid is used, the wellbore temperature field and pressure field formed by the gas-liquid two-phase flow drilling fluid affect each other, which is a coupled solution problem. The temperature and pressure field data of the gas-liquid two-phase flow drilling fluid in the wellbore are the safe implementation of deep water underbalance The key to drillin...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 宋洵成管志川
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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