Measuring and testing – Borehole or drilling – Fluid flow measuring or fluid analysis
Reexamination Certificate
2006-03-21
2006-03-21
Williams, Hezron (Department: 2856)
Measuring and testing
Borehole or drilling
Fluid flow measuring or fluid analysis
C073S152390, C073S152460
Reexamination Certificate
active
07013724
ABSTRACT:
The invention is related to the oil industry and can be used in well intake capacity testing and well bottom zone treatment.On injection line in front of the wellhead it is set a measuring section of a length allowing to fix pressure drops when flow medium of minimum hydraulic friction flowing. The section is in the form of a calibrated pipe with assembled flow sensors, a pressure sensor and an additional differential manometer with impulsive pipes connected with the start and the end of the measuring section. The following operations are conducted. An impulsive non-stationary formation water injection, the injection pressure and flow rate measurements at wellhead, recalculation of the data to the bottom hole conditions, determination of the stored flow rate and the work required for a non-steady state flow of the agent consumption unit in a well bottom zone. Skin-effect coefficient is calculated by these figures, taking into account the current conductivity of a bed, the latter is determined by the results of short-time impulsive non-stationary well intake capacity testing. The method also includes changing of the agent injection mode when the well bottom zone filtration characteristics required are achieved and determined by the skin-effect calculated by the stored flow rate and the agent flow consumption unit work in a well bottom zone, taking into account the current conductivity of a bed.To determine a water permeability, piezoconductivity and radius of a well bottom zone and skin-effect coefficient, a repression function is determined for every gaging in conditions of non-stationary formation water injection during every injection mode, the function characterizes a non-stationary flow in a well bottom zone during the given fluid injection mode. The method also includes a construction of the repression function-logarithm of injection time diagram, highlighting of initial sloping straights on every diagram obtained, finding of parameters of highlighted straights by the least-squares method, by which it is possible to determine a water permeability and piezoconductivity of polluted bottomhole formation zone, as well as its radius and skin-effect coefficient.To determine a water permeability of producing formation, a stored flow rate and repression function, characterizing the work required for a non-steady state flow of the formation water consumption unit are determined, as well as construction of the repression derived function-stored flow rate diagram for bed water permeability range, a fortiori including the desired bed water permeability and a possibility of choice among a great number of curves of derived line, which is in nearby conformity with the derived function constancy condition is made. The derived function corresponds to the desired water permeability of bed.
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Jackson André K.
Jacobson & Holman PLLC
Williams Hezron
LandOfFree
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