Henry Pump Downhole Algorithm

WellStruct class

Public Variables

Well Parameters

Name	Type	Description	Notes
dt	double	seconds between data points	-
tubingHeadPressure	double	Tubing Head Pressure of well (in PSI)	-
fluidGradient	double	Fluid Gradient of well (in lb/ft)	-
sbfriction	double	Stuffing Box Friction (in lbs)	-

Rod Input Parameters

Name	Type	Description	Notes
numTapers	int	Number of tapers in the rod string	-
c	double[10]	Individual damping factors for each rod	1
rodLength	double[10]	Rod length of each taper (in feet)	1
rodDiameter	double[10]	Rod diameter of each taper (in inches)	1
rodYM	double[10]	Youngs Modulus for each rod taper	1
numTapers	int	Number of tapers in the rod string	1

Rod Calculated Parameters

Name	Type	Description	Notes
rodDepth	double[10]	Depth of each taper	1
rodDepthTotal	double	Total depth of the rod string	-
rodWeightAir	double[10]	Weight of each taper in air	1
rodWeightAirTotal	double	Total weight of the rod string in air	-
rodWeightFluid	double[10]	Weight of each taper in fluid	1
rodWeightFluidTotal	double	Total weight of the rod string in fluid	-

Notes

First element of this array should be 0. Data begins at position 1.

Young's Modulus Values

Material	Young's Modulus
Steel	30.5
Fiberglass	7.2

Function Definitions

void setID( int id)

This function sets the wellID variable to the specified id. (This function may be deleted in the next revision of the class)

void UpdateTapers()

This function computes all calculated well parameters from the input parameters of the well.

Tuple<int, double, double> calc (double sPosition, double sLoad)

This function takes surface load and position data and returns a status and the associated downhole position and load data. Status codes will be detailed in another section.

void writeSetup(string filename)

This function writes all well parameters in comma separated values to the specified filename.

void clearTopArrays()

This function clears the intermediate arrays used to process load and position values. This function should be called between sets of non-continuous data.

void taperCompute(double i_dt, double i_tubingHeadPressure, double i_fluidGradient, double i_sbfriction, int i_numTapers, double[] i_c, double[] i_rodLength, double[] i_rodDiameter, double[] i_rodYM)

This function takes the input parameters for the well and computes the calculated values for the rod string. This function calls UpdateTapers().

void readSetup(string filename)

This function reads a comma separated value formatted document into the buffer tags. These buffer tags can then be computed using the taperCompute(…) function.

Status Codes

The following is a table of possible values returned for Item1 of the Tuple returned from the calc() function. Additional codes will be added in the next release of the class library.

value	Meaning
0	There was a problem with the function. No values returned.
5	The function has computed data successfully, but not enough data has been computer to determine the position and load at the bottom of the well
7	The function has computed data successfully and returned valid measurements for load and position

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