DOSAS are committed to helping clients achieve production optimization, from reservoir to refinery. One of the key solutions offered is an integrated approach to production optimization, with full analysis, whether the project be for a single well, a cluster of wells, or in full field development projects.
The following flow chart describes the steps involved in an integrated project, for production optimization in a single well situation.
Single Well Integrated Production Optimization Workflow
A full detailed description of the reservoir, completion, geomechanical properties, hydrocarbon fluid in place, and production data are required to start to understand the reservoir, and eliminate uncertainty as much as possible for the following stages of the workflow.
Single Well Modelling
Reservoir modelling for a single well does not have to be complex, although a thorough understanding of the system is required. A single well can be modelled through analysis of inflow performance and tubing intake curves, and system behaviour can be matched to current well production data to calibrate the model. Well test analysis, if data is available, can also be an extremely useful technique to understand the extent of the drainage area, other geographical features that impact production, and the production flow characteristics.
Problem Identification and Optimization Opportunities
For a well to be selected for the production optimization workflow, there is generally an idea of how the well production can be improved, however, taking time to model the reservoir and well system will identify further opportunities for optimization, and uncover underlying reasons why a well might be under performing. Once a calibrated model has been achieved, other areas of optimization may be identified, such as, reducing well integrity issues, flow assurance opportunities, eliminating unwanted precipitates blocking the flow path of hydrocarbons, removing or by-passing near wellbore damage through stimulation treatments, reperforation opportunities and water shut off opportunities.
Lab testing can help to address the issues as identified using the flowchart thus far. In particular, testing of samples of crude, precipitates, and core plugs where available, are strongly advisable when prescribing correct chemical solutions and dosages for remedial and further preventative treatments for removal of Asphaltene, Scales, Paraffin and Sludges. Such wellbore clean-up treatments can restore well configuration and flowlines back to full flow capacity.
In the case that single well modelling indicates poor reservoir connectivity to the wellbore, stimulation treatments can be designed and modelled in software (using data gathered in the initial phase of the workflow), which provides potential change in near wellbore permeability, and the extent into which the stimulation treatment will reach into the reservoir. Other operational parameters can be obtained through modelling stimulation treatments, and can help in determining operational programmes.
Production Modelling and Economic Analysis
Based on results from simulated treatments, and some empirical methods, changes can be made to the inflow performance curves to estimate incremental production increase, thus, varying parameters in simulated treatments can allow for sensitivity analysis, and are applicable in economics studies to find the optimum treatment design versus production increase.