Schlumberger Technology Corporation

Other

Services Petroliers Schlumberger

Schlumberger Holdings Limited

Prad Research and Development Limited

Anthony J Fitzpatrick

Fikri John Kuchuk

Nikita Chugunov

Kirsty Morton

Denis Biryukov

David Alan Edwards

James G Filas

Stephane Hiron

Georg Zangl

Jonathan Anthony Holmes

Fikri Kuchuk

Sukru Sarac

Alexander Starostin

Bertrand Theuveny

Pavel Evgenievich Spesivtsev

Radek Pecher

Richard Booth

Method for using sensitivity analysis to inform the design and performance of a well test are provided. In one embodiment, a method includes providing a reservoir model of pressure transient behavior and performing a sensitivity analysis to identify an input parameter of the reservoir model that can be estimated from pressure transient test data collected from a well location. This method also includes using the results of the sensitivity analysis to design a pressure transient well test for measuring the identified input parameter. Other methods and systems are also disclosed.

Pressure transient testing with sensitivity analysis

An apparatus for performing a well test operation includes a tubular member having a surge chamber and a valve that can control fluid flow from a well into the surge chamber during the well test operation. The apparatus can also include a flow control device, in addition to the valve, for further controlling fluid flow into the surge chamber from the well. Flow rate and pressure data can be measured during the well test operation and used to estimate reservoir properties. Various other systems, devices, and methods are also disclosed.

Closed chamber impulse test with downhole flow rate measurement

Techniques for modelling a production forecast for a well are described. In one embodiment, a method includes calibrating a geological reservoir model by analyzing pressure transient well tests, fitting the geological reservoir model to pressure data to estimate model parameters, and building a simulated history of bottom hole pressure based on the model and measured transient flow data. The calibrating may further include fitting the model to flow rate data, using measured and simulated pressure data as input, to estimate model parameters, and then building a simulated history of downhole flow rate based on the model and change in measured pressure data. The calibrated model can be used to forecast future well production. Additional methods, systems, and devices are also disclosed.

Integrated interpretation of pressure and rate transients for production forecasting

Pressure transient test with sensitivity analysis

To provide a simplified subterranean model of a subterranean structure, a first grid size for the simplified subterranean model is selected, where the first grid size is coarser than a second grid size associated with a detailed subterranean model. The simplified subterranean model is populated with subterranean properties according to the selected first grid size, where multiple realizations of the simplified subterranean model are provided for different sets of values of the subterranean properties. The realizations of the simplified subterranean model are ranked based on comparing outputs of simulations of the realizations with measured data associated with the subterranean structure.

Providing a simplified subterranean model

A 'near wellbore modeling' software will, when executed by a processor of a computer, model a localized area of a reservoir field which surrounds and is located near a specific wellbore in the reservoir field by performing the following functions: (1) receive input data representative of a reservoir field containing a plurality of wellbores, (2) establish a boundary around one specific wellbore in the reservoir field which will be individually modeled and simulated, (3) impose an 'fine scale' unstructured grid inside the boundary consisting of a plurality of tetrahedrally shaped grid cells and further impose a fine scale structured grid about the perforated sections of the specific wellbore, (4) determine a plurality of fluxes/pressure values at the boundary, the fluxes/pressure values representing characteristics of the reservoir field located outside the boundary, (5) establish one or more properties for each tetrahedral cell of the unstructured grid and each cylindrical grid cell of the structured grid, (6) run a simulation, using the fluxes/pressure values at the boundary to mimic the reservoir field outside the boundary and using the fine scale grid inside the boundary, to thereby determine a plurality of simulation results corresponding, respectively, to the plurality of grid cells located inside the boundary, the plurality of simulation results being representative of a set of characteristics of the reservoir field located inside the boundary, (7) display the plurality of simulation results which characterize the reservoir field located inside the boundary, and (8) reintegrate by coarsening the grid inside the boundary, imposing a structured grid outside the boundary, and re-running a simulation of the entire reservoir field.

Near wellbore modeling method and apparatus

Growing community of inventors

Le Vesinet, France

Anthony J Fitzpatrick