Improvement of Oil Recovery in Hydrocarbon Fields by Developing Polymeric Gel-Forming Composition

Abstract

The paper presents the results of laboratory and field experiments on a developed polymer gel-forming composition “PSB” that enhances oil recovery. In this composition, two aqueous solutions are used: a polymeric gelling agent and an inorganic crosslinker. An alternating injection of solutions that are mixed directly in the reservoir allows a bulk gel to be formed that blocks water or gas breakthroughs. This leads to an increase in oil production, and a decrease in water cut, resulting in more efficient wells. On five wells in a hydrocarbon field that was located within the Permian-Carboniferous deposits, a series of field tests were conducted. It has been observed that wells treated with this developed polymer gel-forming composition “PSB” show a decrease in water cut, a decrease in liquid flow rates, and an increase in oil production. This technology led to an increase in oil flow rates of 5 tonnes per day per well (2 times) and a decrease in water cut of 10-40%, confirming its effectiveness. According to the values of the cumulative effect as of February 2016, this effect continues to increase oil production by 20-600 tons per well.

Express Study of Rheological Properties and Group Composition of Oil and Condensate Using Nuclear Magnetic Resonance – Relaxometry

“…Based on the characteristic decay times of the longitudinal (T1) and transversal (T2) components of the macroscopic magnetization vector, the NMR method allows the evaluation of the oil viscosity, including measurements at well sites [8][9][10][11]. Recently, the issue of effective development of fields with hard-to-recover reserves of high-viscosity oil remains relevant [12][13][14], therefore, NMR studies are being carried out intensively in this direction as well. Along with the rheological properties, it is important to know the composition of the fluid when studying oil and condensate samples.…”