The Kharyaga oilfield is a large oilfield in terms of its geological resources and a very complex one in terms of its geological characteristics. It is located on the territory of the Nenets Autonomous District. The main production target is carbonate formation which is complex in structure and characterized by a high heterogeneity. Factors such as high-paraffin crude oil, aggressive components in associated petroleum gas (hydrogen sulfide), thick permafrost horizons and harsh weather conditions make the Kharyaga field development technically challenging. The development of the above-mentioned field is characterized by an uneven oil recovery of interlayers and by early water breakthroughs in the highly permeable reservoir sections. Various technologies can be used to monitor well performance.
The article presents the results of the pilot project for the new technology introduction of well performance monitoring. This technology proves successful in cases when traditional industrial geophysical methods of well survey can not be applied for various reasons.
Monitoring of the pilot directional well completed with a cemented casing was carried out using the inflow profiling technology based on chemical intelligent markers. These chemical markers were installed on the well completion elements. Polymer matrices, as well as markers, are placed on the outer side of the casing column in the reservoir intervals with a casing. After casing cementing and perforating through polymer matrices in the producing zone, a large-volume selective acid treatment with 15% hydrochloric acid, inhibitors and diverters was injected. The technology of intelligent inflow tracers is used to monitor the well performance for a long period of its productive time and allows solving the following range of tasks: the inflow distribution by intervals, the calculation of water breakthrough intervals, and the evaluation of the well intervention effectiveness .
For the first time in Russia, the directional well was studied using tracers installed behind the production casing. It was followed by cementing, perforation and acid treatment of the bottomhole area.