Method and Apparatus for Evaluating the Potential Effectiveness of Refracing a Well

Inactive Publication Date: 2017-02-23
TECH FLO CONSULTING
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  • Application Information

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Benefits of technology

The patent text describes a method for measuring the production potential of a well by calculating a production index (PI) using static and flowing bottom hole pressure (PS and PF, respectively) measured through a three-phase flow meter. This method allows for the determination of the ratio of oil, gas, and water produced from a well, which can aid in optimizing oil and gas production. The technical effect of this patent text is an improved method for measuring well productivity.

Problems solved by technology

Furthermore, while some efforts have been made to measure the total production of fluids within a well, very little effort has been made to monitor the individual production rates for gas, water, and oil as well as pressure and temperature at various stages of frac zones for the purpose of evaluating the effectiveness of refracing an individual zone using the proposed method and tool configuration in this application.

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  • Method and Apparatus for Evaluating the Potential Effectiveness of Refracing a Well
  • Method and Apparatus for Evaluating the Potential Effectiveness of Refracing a Well

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Embodiment Construction

[0007]These and other needs in the art are addressed in one embodiment by isolating individual frac zones of a previously fraced formation and measuring the Static Bottom Hole Pressure and Flowing Bottom Hole Pressure, so a productivity index can be calculated and the ratio of Oil, Gas and Water can be measured through the use of a three phase flow meter, such as a Doppler flow meter. The production index is a measure of well's potential or ability to produce fluids as a function of reduction in pressure. The production index (PI) is calculated by subtracting the flowing bottom hole pressure (PF) from the static bottom hole pressure (PS) to get a drawdown pressure. The production rate in barrels per day (bpd) is divided by the drawdown to arrive at the PI. Thus if the drawdown pressure is 500 psi and the producing rate is 500 bpd, then the PI is 1.

[0008]The foregoing has outlined rather broadly the features and technical advantages of the present invention in order that the detailed...

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Abstract

A method for evaluating the potential effectiveness of refracing a previously fracked oil / gas well is accomplished by isolating a plurality of previously fracked zones of an oil / gas well in a formation and measuring the fluid flow rates from the isolated zones using a three phase flow meter positioned within the well at or near the previously fracked zones. The zones may be isolated by an isolation assembly which includes two packers connected by a perforated pipe and attached to a tubular positioned within the well.

Description

BACKGROUND OF THE INVENTION[0001]Field of the Invention[0002]This invention relates to a method and apparatus for evaluating the potential effectiveness of refracing an oil / gas well. Individual production zones are tested for flow rates of gas, water and oil to determine which previously fracked production zones are the most productive and consequently the best candidates for refracing.[0003]Description of Related Arts Invention[0004]Currently when refracing a well the overall productivity of the well is considered before a decision to refrac is made. Little is known about which of the many perforated zones are productive in a well. Therefore, a method of determining which of the zones could benefit from refracturing is very important.[0005]Furthermore, while some efforts have been made to measure the total production of fluids within a well, very little effort has been made to monitor the individual production rates for gas, water, and oil as well as pressure and temperature at var...

Claims

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Application Information

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IPC IPC(8): E21B47/10E21B43/14E21B33/12
CPCE21B47/10E21B43/14E21B33/12
InventorJACKSON, WILLIAM J.REISSIG, ERIK J.MILLER, II, JAMES L.
OwnerTECH FLO CONSULTING