2 results about "Linear formula" patented technology

The invention belongs to the field of bridge engineering structure analysis, and particularly relates to a universal linear calculation method for a multi-span long-connection prestressed continuous box girder, which comprises the following steps of: S1, segmental processing and basic data acquisition: discretizing a bridge into a plurality of unit segments along the longitudinal direction of the bridge, defining parameters of each unit, including a cross-sectional inertia moment, a concrete elastic modulus, a cross-sectional area, a cross-sectional height and a thermal expansion coefficient, generating a unit stiffness matrix, and assembling a global total stiffness matrix; s2, simplifying a stress model and deriving a linear equation, respectively deriving linear change equations caused by self weight, a temperature effect, a creep effect and a prestress effect based on a structural mechanics principle, and solving node displacement under each effect through a finite element method; and S3, linear formula combination and full-bridge linear calculation are carried out, displacement of each effect is superposed according to a construction stage, and a continuous linear equation is generated by adopting a Hemite shape function interpolation, so that the calculation precision is improved.

The present application relates to a kind of integrated gas well productivity evaluation method, comprising the following steps: S1, obtaining gas well relevant data: formation pressure, gas well standard production gas and bottom hole flowing pressure data;S2, solving laminar flow term coefficient A, turbulence term coefficient B, solve gas well open flow capacity;A, B coefficient is solved using plotting method, corresponding linear formula is obtained using linear regression fitting, the intercept and slope of formula are A, B value;A, B and P e Substitute binomial formula (2), open flow capacity q AOF Is solved: S3, if binomial productivity equation coefficient A, B exists negative value, using pressure term correction value correction to obtain positive value coefficient A' and B';Then, based on A' and B' are substituted into formula (2) to obtain open flow capacity q AOF The gas well productivity evaluation method of the present application makes full use of the data obtained during the development of gas well for analysis and evaluation, and realizes efficient and accurate evaluation combined with the characteristics of gas well, which is of great significance for production guidance.