The coefficient obtained from the regression of Equation (3)
could be determined in terms of the true value of variables or the
level of the variables (1, 0, 1); The equation resulted from the first
state is called “un-coded equation” and the equation consisting
coefficients in terms of the level of variables is called “coded
equation”. In coded equation for level 1, 0 and 1, the minimum,
average and maximum amount of gas injection at each well has
been allocated, respectively which were shown in Table 1.
Equations (4) and (5) are the un-coded and coded equations of
oil production rate in terms of gas injection rate for the five wells,
respectively