Methods for calculating important parameters, related to parameter calculations

1.Differential pressure in production.

If this function is selected, the pop-up calculation is shown in Figure 6-23. After entering the data in the data frame, click the Liquid Production Index and Water Cut button, enter the liquid production index under different water content in the pop-up data box (Figure 6-23), and click the Calculate Display button to dismiss the judgment wheel, the production pressure difference under the same liquid production volume will not be flushed in the plot area on the left. The differential production pressure at the target volume is displayed above the calculation signal.

Figure 6-23 Production differential pressure calculation box.

2.Minimum flow pressure calculation.

1) Specify the sinking degree and pump hook depth method (Figure 6-24).

Figure 6-24 Calculation of minimum flow pressure (specified sinking degree and pumping depth method).

Port pressure: After entering the data in the data frame and clicking the Calculate Display button, the pump port pressure curves for different degrees of sinking will be displayed in the plot area on the left. Below the calculation display button, the pump pressure at the specified sinking degree is displayed.

Mixed Liquid Column Pressure: After entering the data in the data frame and clicking the Calculate Display button, the mixed liquid column pressure at different pump hanging depths will be displayed in the plot area on the left. Below the calculation display button, the liquid column pressure at the specified pump hook depth is displayed.

Minimum flow pressure: After clicking the button, the minimum flow pressure curve under different pump hanging depths is displayed in the drawing area, and the flow pressure under the specified conditions is displayed in the data frame on the right.

2) The saturation pressure and formation pressure methods are known (Fig. 6-25).

After entering the required data, click Calculate PWF

PR displays the minimum flow pressure corresponding to different formation pressures in the plot area on the left, click Calculate PWF

fw shows the minimum flow pressure curves for different water cuts in the plot area on the left.

Figure 6-25 Calculation of minimum flow pressure (known saturation pressure and formation pressure method).

Parameters, also called parametric variables.

is a variable. When we study the problem at hand, we are concerned with the changes in certain variables and the interrelationships between them, one or some of which are called independent variables, and the other or others are called dependent variables. If we introduce one or more variables to describe the change between the independent variable and the dependent variable, the introduced variable is not the variable that must be studied in the current problem, and we call such a variable a parameter or parameter.

Parameters are an option that can be used in many mechanical setups or repairs, literally p>

1.Rationality.

The depth of the groundwater level, the permeability coefficient, the unit water inflow, the radius of the pumping well, and the radius of the temperature of the recharge water are calculated based on the data obtained from the pumping test. The calculation formula is recommended by the relevant codes, and the derivation of the formula is based on the theory of groundwater dynamics. There is a theoretical basis for the calculation formula.

Parameters such as single-hole heat transfer, comprehensive heat transfer coefficient, average thermal conductivity, and temperature field variation range of buried pipes are calculated based on the field test data of heat exchange. The numerical simulation, forward and reverse simulation and calculation formulas are derived based on the theory of heat conduction, which is relatively mature.

2.Adequacy of influencing factors to consider.

The influence radius of the pumping well and the influence radius of the recharge temperature field are calculated by numerical simulation. In the numerical simulation, the factors of groundwater recharge, runoff, and discharge are fully considered, and many factors affecting the groundwater flow field are fully considered. Parameters such as single-hole heat exchange, comprehensive heat transfer coefficient, average thermal conductivity, and temperature field change range of buried pipe are calculated according to the heat exchange field heat exchange test data, and the test data is a comprehensive reflection of rock and soil mass, numerical simulation calculation, forward and reverse simulation and calculation, and the geological environment in which the buried pipe is located has been fully considered.

3.Usefulness of parameters.

The parameters such as the influence range of the temperature field of the pumping well, recharge well and buried pipe calculated by numerical simulation are close to the data used in actual engineering practice, which indicates that the calculated parameters have a certain practicability.