Oil-gas well tubular column annulus extreme pressure prediction method

Abstract

The invention provides an oil-gas well tubular column annulus extreme pressure prediction method. The method includes the steps of obtaining tubular column pressure state information, obtaining the safest tubular column external pressure model when the given tubular column internal pressure value is included in the tubular column pressure state information, obtaining the safest modulator tube internal pressure model when the given tubular column external pressure value is included in the tubular column pressure state information, comparing the tubular column external pressure model and / or the tubular column internal pressure model with the tubular column external pressure value and / or the tubular column internal pressure value in the tubular column pressure state information, and judging whether a current tubular column is safe or not according to the comparison result. In this way, by predicating the minimum allowable pressure, the maximum allowable pressure and the safest pressure of the gas-well tubular column annulus, the gas production engineering scheme design and the gas well safe production management and control are guided; by predicting the balance pressure of the oil-gas well fracturing tubular column annulus, safety of fracturing tubular columns is ensured.

Description

technical field [0001] The invention relates to the safety production technology of oil and gas wells in the petroleum and natural gas industry, and is especially suitable for the prediction of the limit pressure of the annulus of a high-temperature, high-pressure, high-acidity gas well and the determination of the annulus balance pressure of a fracturing pipe string of an oil and gas well. Background technique [0002] With the continuous deepening of natural gas exploration and development, a large number of high-pressure gas wells have successively experienced the phenomenon of annular pressure in the development process. The phenomenon of pressure in the outer annulus of tubing or casing in high-pressure gas wells is very common, and the problems caused by it are becoming more and more serious. The U.S. Department of Mines has made statistics on annular pressure in the outer continental shelf region of the United States, and found that more than 8,000 wells in this area ...

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Problems solved by technology

[0003] At present, domestic research on high-pressure gas well annulus pressure management is not deep enough, and the method for determining the safe range of annulus pressure is still far from perfect. For example, in the literature, only one-way Stress, did not consider the triaxial stress, only predicted the maximum and minimum pressure, did not predict the safest pressure

[0004] In addition, at present, the calculation method of the annular space equilibrium pressure of oil and gas well fracturing string is not perfect.

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