J.W. Jennings

An improved finite difference calculation of downhole dynamometer cards for sucker rod pumps

This paper presents a finite-difference representation of the wave equation developed for diagnostic analyses of sucker rod pumping systems. A consistent method of computing the viscous damping term associated with the damped-wave equation is also presented

Use of pattern-recognition techniques in analyzing downhole dynamometer cards

Four pattern-matching methods are presented to evaluate the downhole condition of sucker-rod-pumped wells. Comparing the generated pump dynagraph of a well being tested to various downhole dynagraphs characteristic of particular rod-pump problems allows the pattern-matching methods to diagnose a variety of different pump conditions. In the future, one of the pattern-matching methods could be incorporated into an automated system designed to monitor the performance of an oilfields rod-pumped wells.

The Optimization Of Well Spacing And Fracture Length In Low Permeability Gas Reservoirs

This study describes a process for optimizing well spacing and fracture length in a low permeability gas reservoir. Three examples are discussed which represent a high permeability, a low permeability, and a medium permeability gas reservoir. The results from these investigations suggest that the solution is not always intuitively obvious. The complex interaction of the variables involved in each problem almost necessitates the use of a computer model to optimize the exploitation of a tight gas reservoir. Numerous computer runs have been made to illustrate the economic optimum fracture lengths for a variety of reservoir cases.

A Method for Designing Fiberglass Sucker-Rod Strings With API RP 11L

This paper presents a method for using the API recommended practice for the design of sucker-rod pumping systems with fiberglass composite rod strings. The API method is useful for obtaining quick, approximate, preliminary design calculations. Equations for calculating all the composite material factors needed in the API calculations are given.