WBPC19 Abstract #4:
Thanks to the advancements in and convergence of horizontal well drilling and hydraulic fracturing, oil production from tight formations has become possible and economic. While hydraulically fractured horizontals wells (HFHW) have increased the productivity of these reservoirs, many Canadian operators have further improved oil recovery from these same formations, with the successful application of the secondary recovery method of waterflooding. As an example, formations that have shown success with the combination of HFHW and waterflooding are the Canadian Bakken Shale, lower Shaunavon, Viking, Belly River and Cardium. With the application of waterflooding on these HFHW, one issue that operators are facing is the management of quick water breakthrough due to well to well communication through the network of induced fractures, resulting in poor sweep efficiency of waterfloods.
Conformance improvement using polymer gel technology has been a common practice in conventional assets for 30 years. After candidate selection and diagnosis of communication between wells, a treatment design is put together based on the level of communication, basically the transit time between the two well. Conformance job is implemented in increasing polymer concentration at fixed polymer to crosslinker ratio. The idea is to build pressure continuously throughout the treatment, an indication of polymer gel filling up the path of communication.
This article discusses a new application for gel conformance technology, in HFHW tight oil waterfloods, as a rig-less. cost-effective solution, to address the well to well communication and improve sweep efficiency. Candidate selection, problem diagnosis, engineering design and success stories are going to be discussed in this article.