Oil-gas well annulus geometry model generation method

An oil-gas well annulus geometry model generation method comprises the steps that continuous functions of all preset engineering parameters in a preset engineering parameter set along with well depthchanges are determined according to obtained actual measurement data in the well cementation process, and a first function set is obtained; the method also includes determining an annulus geometry axis coordinate function according to the first function set to obtain a second function set; according to the first function set, respectively determining an inner diameter coordinate function and an outer diameter coordinate function of the annulus geometry under the three-dimensional coordinate system to obtain a third function set; and adjusting the third function set by using the second functionset to generate an annulus geometry model of the oil and gas well. According to the method, by constructing the annulus geometry, the annulus geometry of the oil and gas well can be accurately described, and work such as well