The project goal is to develop a sonic well performance-enhancement technology that focuses on near-wellbore formations.
This project was selected in response to DOE's Oil Exploration and Production solicitation DE-PS26-01NT41048, focus area Effective Environmental Protection.
Pennsylvania State University
University Park, PA
The overall strategy is to develop, evaluate, and characterize an acoustic excitation technique that can be used to stimulate oil wells by effecting flow improvement in the near-wellbore region. To this end, the investigators have identified the following tasks:
The following are the salient scientific and technical bases for the proposed work:
The successful development and deployment of sonic well stimulation technology will significantly enhance well deliverability and solve one of the perennial problems of oil and gas productivity, namely the impact of skin damage on oil well productivity. The principal focus of the proposed work is the development of this technology. The scope of the project is designed to cover laboratory experiments, mathematical modeling, transducer design and testing, and field-scale testing regimes. The successful completion of these tasks will produce a good understanding of the performance capability of sonication as a means to stimulate and remediate damaged wellbore zones, the mechanisms governing such processes, and the possible configuration for field deployment.
The successful completion of this project and the deployment of the resulting sonic oil well stimulation technology (OWST) would provide the operator with a cost-effective and environmentally benign alternative to conventional well stimulation technology. The sonic technology will help independent oil and gas operators achieve breakthrough technology needed to extend the life of their wells and thereby increase ultimate production. This eventually could add significant reserves to the Nation's energy resources.
The slim tube experimental apparatus was designed, built, and tested. Using the slim tube set-up, one-dimensional flow data under the influence of acoustic stimulation were collected for a range of flow and acoustic parameters as well as various porous media characteristics.
A one-dimensional acoustic stimulation model was developed and tested. Specialization was done to isolate different phenomena, including cavitation and thermal effects. Due to limited time, researchers did not investigate the effects of interfacial phenomena. Students are in the process of extending this model to include some of these phenomena.
An attempt was made to develop the source function arising from cavitation, which turns out to play a significant role, at least under laboratory conditions. The next step is to incorporate this source term in a reservoir model that could shed light on the impact of acoustic stimulation of near-wellbore flow.
Field testing commenced with the drilling of four new wells, designed specifically for the testing of this sonic tool. In addition, one existing well was recompleted to accommodate the testing regime planned for this work. Log data as well as core data were acquired in order to form the baseline for the field deployment and testing of the tool. Appropriate metering and associated instrumentation were acquired in preparation for the field testing of the tool. This task has now been halted for lack of budgetary support.
The project is in the third year of four-year funding.
$752,924 (20% of total)