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US 10,480,315 B2Granted
Average/initial reservoir pressure and wellbore efficiency analysis from rates and downhole pressures
AssigneeSchlumberger Technology Corporation
InventorsVarma Gottumukkala, Bobby Dale Poe, Jr.
Life of this patent
Estimating the term…
Abstract
Systems and methods for calculating reservoir characteristics, including well pressure and flow rates are disclosed. Plotting and monitoring a plot of pressure (p) and flow rate (q) as p/q on a y-axis and 1/q on an x-axis can provide insight into well characteristics with zero RMS error.
Claims17
A method of characterizing parameters of a reservoir, comprising:
- acquiring transient well production data for a well producing fluid from the reservoir;
- using the transient well production data for obtaining a reservoir pressure, p, for the reservoir and a reservoir flow rate, q;
- plotting p/q on a first axis, and 1/q on a second axis wherein the plot of p/q and 1/q comprises a first time and a second time;
- using the plot, while producing fluid from the reservoir, identifying a change in reservoir characteristics between the first time and the second time;
- and
- based on the identified change, controlling well completion components to enhance producing fluid from the reservoir.
3 more elements
A method of reviving a reservoir, comprising:
- acquiring transient well production data for a well producing fluid from the reservoir;
- using the transient well production data for:
- obtaining a reservoir effective permeability, k,
- a reservoir net pay thickness, h,
- an initial reservoir pressure, Pi,
- a reservoir flow rate, q,
- a viscosity of oil in the well, μ, and
- a formation volume factor, B;
- calculating a dimensionless parameter for wellbore pressure, PwD;
- and
- calculating a number Pwf/q, according to the equation:
- Pwf/q=Pi(1/q)−CμBPwD/kh, wherein C is a constant;
- plotting the parameters p and q with p/q on a y-axis and 1/q on the x-axis wherein the plot of p/q and 1/q is monitored with respect to time to determine changes in the reservoir characteristics;
- and
- based on the determined changes, reviving well production from the reservoir.
12 more elements
A method comprising:
- acquiring wellbore flow rate data and wellbore pressure data of a wellbore of a well in fluid communication with a reservoir with respect to time;
- determining a slope and an intercept of a line using points in time for the wellbore pressure data divided by the wellbore flow rate data with respect to reciprocal wellbore flow rate data, wherein the division of the wellbore pressure data by the wellbore flow rate data and the reciprocal wellbore flow rate increase a coefficient of determination of the line, wherein the slope corresponds to an average reservoir pressure with respect to time and wherein the intercept corresponds to reservoir characteristics with respect to time;
- while producing fluid from the well, determining a change in reservoir characteristics with respect to time using the intercept;
- and
- reviving production of fluid from the well using the change in reservoir characteristics with respect to time.
2 more elements
Dependencies are inferred from the claim text.