X-RAY ANALYSIS OF CONFORMANCE CONTROL TECHNOLOGY BASED ON PREFORMED PARTICLE GEL TREATMENT

Abstract

The relevance. Most fields of the Volga-Ural oil and gas province are characterized by high water cut of wells that determines the high demand of effective technologies for decreasing excess water production. For these purposes, preformed particle gel (PPG) technology is widely used abroad. However, for PPG application in domestic oil fields, it is necessary to take into account their geological and technological operating conditions. This problem is solved for conditions of low-temperature formations with high salinity of formation water. The publication presents the test results of the developed PPG polymer and standard polymer flooding on sandstone core. The main aim is to evaluate the possibility of injection of PPG into a terrigenous core, to conduct a comparative analysis of PPG treatment with traditional polymer flooding. Object: terrigenous cores of Perm deposits, a solution of a water-soluble polyacrylamide, PPG. Method. Filtration tests were carried out on the filtration installation UIK-5VG. The X-ray tomography method was used to estimate the pore space changing after PPG treatment and compare it with traditional polymer flooding. Results. The authors synthesized particles of a polymer gel (PPG technology) for reservoir conformance control. During application of PPG through the injection well the gel particles are able to move through the near well bore zone and block the high permeable reservoir zones, that leads to redistribution of water flows to the low-permeable zones. The composition of the polymer is adapted to the conditions of low-temperature formations with high salinity of formation water. The article presents the test results of the developed polymer on core models. The studies involved the data from the method of X-ray tomography of the core. The results of tomographic studies made it possible to visualize and quantitatively calculate the filling of the core pore space with a suspension, taking into account the size of individual pores. It was established that the developed polymer fills highly permeable intervals much more efficiently than standard polyacrylamide flooding.

Keywords

• polymer
• polyacrylamide
• reservoir profile conformance control
• core x-ray tomography
• preformed particle gel
• water cut